CN119086834A - A flue gas monitoring device and a flue gas monitoring method - Google Patents
A flue gas monitoring device and a flue gas monitoring method Download PDFInfo
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0006—Calibrating gas analysers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0031—General constructional details of gas analysers, e.g. portable test equipment concerning the detector comprising two or more sensors, e.g. a sensor array
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0073—Control unit therefor
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Abstract
The invention discloses a smoke monitoring device and a smoke monitoring method, and relates to the technical field of smoke monitoring. The flue gas monitoring device comprises a gas sensor, wherein the gas sensor is connected with an instrument air inlet through a pretreatment module and is connected with an instrument air outlet through a rotameter. The device further comprises a humidity monitoring module, a pressure monitoring module and a control module, wherein the humidity monitoring module is used for monitoring the air inlet humidity of the air inlet pipeline, the pressure monitoring module is used for monitoring the internal pressure of the gas sensor, and the control module is respectively connected with the humidity monitoring module and the pressure monitoring module and used for configuring the operation working condition of the smoke monitoring device, setting and calibrating the threshold value based on the operation working condition and carrying out abnormal evaluation on the air inlet humidity and the internal pressure. Whether the inlet air humidity and the internal pressure of the sensor meet detection conditions can be directly judged, whether the front-end pretreatment link is abnormal or not can also be indirectly judged, a basis is provided for adjusting the detection conditions of the instrument, a new control dimension is added for the operation and maintenance of the instrument, and the improvement of the detection accuracy of the instrument is facilitated.
Description
Technical Field
The invention relates to the technical field of flue gas monitoring, in particular to a flue gas monitoring device and a flue gas monitoring method.
Background
An automatic flue gas monitoring system (Continuous Emission Monitoring System, CEMS for short) is a device for continuously monitoring the concentration and total emission of gaseous pollutants and particulate matters emitted by an atmospheric pollution source. In the energy field, the automatic flue gas monitoring system is mainly used for continuously and online monitoring parameters such as the concentration of particulate matters in the boiler waste gas, the concentration of sulfur dioxide (SO 2), the concentration of nitrogen oxides (NO X), the content of oxygen (O 2), the content of carbon dioxide (CO 2) and the like.
In the existing CEMS instrument, a CO 2 sensor, an O 2 sensor and other gas sensors are generally configured, and the smoke concentration is generally monitored by adopting an infrared optical detection principle, so that the following problems exist:
Firstly, the existing CEMS instrument is usually calibrated by using dry standard gas and is easily influenced by residual moisture in pretreatment (direct pumping cold dry method or dilution method) of the front section of the instrument, but the existing CEMS instrument only has detection capability, and cannot find that the pretreatment of the front section of the instrument is abnormal, so that the accuracy of a detection result is poor, and secondly, the essence of an infrared optical detection principle is that a voltage and current signal is output according to the characteristic infrared energy absorbed in a reaction tank and then is converted into a concentration value, and the detection result is directly related to the number of characteristic molecules in the reaction tank, namely, the detection result is related to the internal pressure of the instrument, so that when the internal pressure of the instrument is different from the calibrated pressure, the deviation of the detection result easily occurs. The existing CEMS meters do not consider the influence of pressure change on the detection result, so that the accuracy of the detection result is poor.
Disclosure of Invention
The invention provides a smoke monitoring device and a smoke monitoring method, which solve the problem that the detection accuracy is poor due to the fact that the detection result of the existing CEMS instrument is easily influenced by the changes of the air inlet humidity and the internal pressure of the instrument.
The first aspect of the invention provides a smoke monitoring device, which comprises an instrument body and a gas sensor arranged in the instrument body, wherein the gas sensor is connected with an instrument air inlet through a pretreatment module, and the gas sensor is connected with an instrument air outlet through a rotameter; the system comprises a gas sensor, a gas outlet pipeline, a pressure monitoring module, a control module and a control module, wherein the gas outlet pipeline is arranged between the gas sensor and the rotameter and is used for monitoring the internal pressure of the gas sensor, the control module is respectively connected with the humidity monitoring module and the pressure monitoring module and is used for configuring the operation working condition of the flue gas monitoring device, and at least one of the humidity monitoring module, the pressure monitoring module or the gas sensor is subjected to threshold setting and calibration based on the operation working condition, and the inlet humidity and the internal pressure are subjected to abnormal evaluation.
Optionally, the control module is configured to determine a humidity threshold of the humidity monitoring module according to a first operation condition and perform abnormal evaluation on the air intake humidity based on the humidity threshold, and/or determine a calibration reference value and a pressure threshold of the pressure monitoring module according to a second operation condition and perform abnormal evaluation on the internal pressure based on the calibration reference value and the pressure threshold, wherein the first operation condition is established based on air intake data of the meter air intake and preprocessing data of the preprocessing module, and the second operation condition is established based on air intake data of the meter air intake and flow data of the rotor flowmeter.
Optionally, the control module is further configured to perform zero calibration on the pressure monitoring module according to a third operation condition, and/or perform zero calibration and full-scale calibration on the gas sensor according to a fourth operation condition, wherein the third operation condition is established based on the air inlet data of the instrument air inlet, the working state of the rotor flowmeter and the working state of the pressure monitoring module, and the fourth operation condition is established based on the air inlet data of the instrument air inlet.
Optionally, the flue gas monitoring device further comprises a display module connected with the control module, wherein the display module is used for displaying at least one of an operation condition configuration window, the air inlet humidity, the internal pressure, a humidity threshold of the humidity monitoring module, a calibration reference value and/or a pressure threshold of the pressure monitoring module, an air inlet abnormity evaluation result and a pressure abnormity evaluation result.
Optionally, the humidity monitoring module comprises a drying pipe, wherein a drying agent is arranged in the drying pipe, the drying agent generates a color change reaction according to the humidity of the inlet air, and at least part of the drying pipe is provided with an observation part which is used for displaying the color change reaction result.
Optionally, the observation part is provided with scale marks for displaying the numerical value corresponding to the color change reaction result, and/or the drying pipe is arranged on the instrument panel or the surface protruding part of the instrument body.
Optionally, the humidity monitoring module further comprises a humidity sensor, wherein the humidity sensor is arranged between the drying pipe and the preprocessing module, and the humidity sensor is used for converting the air inlet humidity into an electric signal and transmitting the electric signal to the control module.
Optionally, the pressure monitoring module is provided with a first port, a second port, a third port and a fourth port, the first port is connected with the gas sensor, the second port is connected with the rotameter, the third port is provided with a micro-pressure sensor, the micro-pressure sensor is electrically connected with the control module, the fourth port is provided with a pressure discharge valve, and the control end of the pressure discharge valve is electrically connected with the control module.
Optionally, the humidity monitoring module is provided with a first temperature compensation unit and/or a pressure compensation unit for compensating and correcting the air intake humidity, and the pressure monitoring module is provided with a second temperature compensation unit for compensating and correcting the internal pressure.
The second aspect of the invention provides a flue gas monitoring method, which is realized based on the flue gas monitoring device, wherein the flue gas monitoring device is provided with a humidity monitoring module, a pressure monitoring module and a gas sensor, the humidity monitoring module is used for monitoring the humidity of inlet air, the pressure monitoring module is used for monitoring the internal pressure of the gas sensor, the method comprises the steps of configuring the operation working condition of the flue gas monitoring device, setting and calibrating at least one of the humidity monitoring module, the pressure monitoring module or the gas sensor based on the operation working condition, and carrying out abnormal assessment on the humidity of inlet air and the internal pressure.
According to the technical scheme, the humidity monitoring module is used for monitoring the air inlet humidity of the air inlet pipeline, the pressure monitoring module is used for monitoring the internal pressure of the gas sensor, and the control module is respectively connected with the humidity monitoring module and the pressure monitoring module and used for configuring the operation working condition of the smoke monitoring device, setting and calibrating the threshold value based on the operation working condition and carrying out abnormal assessment on the air inlet humidity and the internal pressure. Whether the inlet air humidity and the internal pressure of the sensor meet detection conditions can be directly judged, whether the front-end pretreatment link is abnormal or not can also be indirectly judged, a basis is provided for adjusting the detection conditions of the instrument, a new control dimension is added for the operation and maintenance of the instrument, and the detection accuracy of the instrument is improved.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a smoke monitoring device according to a first embodiment of the present invention;
FIG. 2 is a schematic view of another smoke monitoring device according to a first embodiment of the present invention;
Fig. 3 is a flowchart of a smoke monitoring method according to a second embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements that are expressly listed or inherent to such process, method, article, or apparatus.
Example 1
Fig. 1 is a schematic structural diagram of a smoke monitoring device according to a first embodiment of the present invention, referring to fig. 1, the smoke monitoring device includes a meter body and a gas sensor 1 disposed in the meter body, the gas sensor 1 is connected to a meter air inlet 7 through a preprocessing module 5, and the gas sensor 1 is connected to a meter air outlet 8 through a rotameter 6. Wherein the pretreatment module 5 is used for carrying out drying pretreatment on the inlet air. In the present embodiment, the gas sensor 1 is specifically understood as a sensor capable of detecting various gas components in flue gas, such as carbon dioxide (CO 2), carbon monoxide (CO), nitrogen oxides (NO X), and volatile organic compounds (VOC S). In the present embodiment, the gas sensor 1 includes, but is not limited to, a CO 2 sensor and an O 2 sensor. The sensors can monitor the composition change of the smoke in real time, and provide important data support for the emission control and environmental monitoring of the smoke. By way of example, the gas sensor 1 may be a Metal Oxide Semiconductor (MOS) sensor, an optical sensor, an electrochemical sensor, or the like, to accommodate different application environments and detection requirements. For example, the MOS sensor has the characteristics of high response speed and high sensitivity, is suitable for rapidly detecting the change of the concentration of the gas, and the electrochemical sensor has higher selectivity and accuracy when detecting specific gases (such as CO and NO X).
Referring to fig. 1, the flue gas monitoring device of the present application further comprises a humidity monitoring module 2, an air inlet pipeline arranged between the gas sensor 1 and the pretreatment module 5, and configured to monitor the air inlet humidity of the air inlet pipeline. The pressure monitoring module 3 is arranged on an air outlet pipeline between the gas sensor 1 and the rotameter 6 and is used for monitoring the internal pressure of the gas sensor. And the control module 4 is respectively connected with the gas sensor 1, the humidity monitoring module 2 and the pressure monitoring module 3.
In this embodiment, the control module 4 is configured to configure an operation condition of the flue gas monitoring device, and perform threshold setting and calibration on at least one of the humidity monitoring module 2, the pressure monitoring module 3, or the gas sensor 1 based on the operation condition, and perform abnormal assessment on the intake humidity and the internal pressure.
The operation conditions of the flue gas monitoring device include, but are not limited to, introducing standard gas from the instrument air inlet 7, adjusting data such as standard gas inlet amount and air inlet pressure, introducing air from the instrument air inlet 7, adjusting data such as air inlet amount and air inlet pressure, and configuring the flow of the rotameter 6.
At least one of the humidity monitoring module 2, the pressure monitoring module 3, or the gas sensor 1 is thresholded and calibrated based on operating conditions, including, but not limited to, setting an intake humidity threshold, setting an internal pressure threshold, and setting a calibration reference for the pressure sensor. In the present embodiment, the intake air humidity threshold value is specifically understood as an upper humidity threshold value and a lower humidity threshold value that do not affect the detection accuracy of the gas sensor 1 under a specific operation condition. The internal pressure threshold is specifically understood as an upper pressure threshold and a lower pressure threshold that do not affect the detection accuracy of the gas sensor 1 under certain operating conditions.
The intake air humidity and the internal pressure are evaluated for abnormality including, but not limited to, determining whether there is an abnormality in the intake air humidity based on an intake air humidity threshold value, and determining whether there is an abnormality in the internal pressure based on an internal pressure threshold value.
Specifically, before the flue gas monitoring device is used, the control module 4 performs threshold setting and calibration on the gas sensor 1, the humidity monitoring module 2 and the pressure monitoring module 3. After the threshold setting and calibration are completed, intake air humidity and internal pressure abnormality evaluation is started. The humidity monitoring module 2 monitors the air inlet humidity in the air inlet pipeline in real time, the pressure monitoring module 3 is used for monitoring the internal pressure change of the gas sensor 1, the control module 4 compares the air inlet humidity threshold value with the air inlet humidity, judges that the air inlet humidity is abnormal when the air inlet humidity exceeds the range limited by the air inlet humidity threshold value, compares the internal pressure threshold value with the internal pressure, and judges that the internal pressure change is abnormal when the internal pressure exceeds the range limited by the internal pressure threshold value. Through setting up humidity detection module at the air inlet pipeline, set up pressure detection module at the air outlet pipeline, can directly judge whether air inlet humidity and sensor internal pressure accord with the detection condition, also can indirectly judge whether front end preprocessing link has unusually, provide the basis for adjusting instrument detection condition, increased new control dimension for instrument fortune dimension, improve instrument detection accuracy.
Optionally, fig. 2 is a schematic structural diagram of another smoke monitoring device according to a first embodiment of the present invention, and referring to fig. 2, the smoke monitoring device further includes a display module 9, connected to the control module 4, where the display module 9 is configured to display at least one of an operation condition configuration window, an intake air humidity, an internal pressure, a humidity threshold of the humidity monitoring module 2, a calibration reference value and/or a pressure threshold of the pressure monitoring module 3, an intake air abnormality evaluation result, and a pressure abnormality evaluation result.
Specifically, the display module 9 may be a display with an operable function, where the display module 9 performs control instruction and data interaction with the control module 4, and is mainly used for displaying multiple key information such as configuration window, humidity, pressure, and abnormality early warning in real time, so as to facilitate monitoring and adjustment by an operator. The display module 9 provides an operating condition configuration window that allows an operator to view and adjust the operating mode of the gas sensor 1, the status of the humidity monitoring module 2 and the pressure monitoring module 3, and the like. In addition, the display module 9 displays the current values of the air inlet humidity and the internal pressure in real time, so that operators can know the humidity and the internal pressure of the air inflow device. It also shows the humidity threshold of the humidity monitoring module 2 and the calibration reference value and pressure threshold of the pressure monitoring module 3, so that the operator can quickly judge whether the set safety range is exceeded. The display module 9 provides comprehensive monitoring and control information for operators, and ensures the safe, stable and efficient operation of the smoke monitoring device.
For example, the display module 9 can update and display the results of the intake air abnormality evaluation and the pressure abnormality evaluation in real time, for example, if the gas sensor 1 detects an abnormal rise in the humidity of CO 2, the module will immediately issue a warning and display the relevant information. In addition, the display module 9 also gives an alarm when the internal pressure exceeds a set maximum threshold value, ensuring that the operator can take measures in time.
Optionally, referring to fig. 2, the humidity monitoring module 2 includes a drying pipe 201, and a desiccant is disposed in the drying pipe 201, and the desiccant undergoes a color change reaction according to the humidity of the intake air. The drying tube is at least partially provided with an observation portion for displaying the color change reaction result.
In this embodiment, the drying duct 201 is specifically understood as a transparent or semitransparent duct for monitoring the humidity of the gas, the inside of which is filled with a specific drying agent. The desiccant can generate obvious color change reaction according to the change of the humidity of the inlet air, thereby intuitively reflecting the humidity level of the air. In particular, the desiccant tube 201 is designed such that the desiccant changes from an original color to another color as the humidity increases, which change is clearly visible through an observation outside the desiccant tube 201. The observation portion may be a transparent window of the desiccant tube 201, which facilitates an operator to monitor the color change of the desiccant at any time, so as to quickly determine whether the intake humidity exceeds a preset humidity threshold. When an operator observes that the intake air humidity exceeds the humidity threshold of the humidity monitoring module 2 through the drying pipe 201, timely diagnosis is made as to whether the front-end preprocessing module is abnormal or not. From this, through setting up drying tube 201, not only can carry out drying process to the inlet air, can also visual display inlet air humidity monitoring data, be convenient for judge indirectly through the observation result whether front end preprocessing link has unusually, strengthened operating personnel's visual understanding to equipment running state.
Illustratively, the desiccant tube 201 uses an inert desiccant that does not react with contaminant gases such as CO 2、SO2、NOX, such as a color changing silica gel.
In some embodiments, the observation portion is provided with graduation marks for displaying a numerical value corresponding to the color change reaction result. Wherein, the corresponding value of the color change reaction result can be the color change proportion of the drying agent in the drying pipe. In this embodiment, the mark positions of the graduation marks may be set to include at least an upper limit position, such as a 2/3 position, of the desiccant color-changing ratio corresponding to the humidity threshold, that is, when the operator observes that the color-changing ratio of the desiccant in the desiccant tube 201 exceeds 2/3, the desiccant tube 201 is replaced.
In some embodiments, the drying duct 201 is provided at the instrument panel or the out-of-plane projection of the instrument body. Through arranging the drying pipe 201 at the instrument panel or the outward protruding position so that operation and maintenance personnel can inspect, the drying pipe 201 can be replaced from the front panel without opening the instrument, so that in the actual operation process, an operator can conveniently monitor the humidity change and make corresponding adjustment in time.
Optionally, referring to fig. 2, the humidity monitoring module 2 further includes a humidity sensor 202, where the humidity sensor 202 is disposed between the drying duct 201 and the preprocessing module 5, and the humidity sensor 202 is configured to convert the humidity of the intake air into an electrical signal and transmit the electrical signal to the control module 4.
In this embodiment, the humidity sensor 202 may be a resistive-capacitive sensor, which can accurately measure the relative humidity in the intake air and convert the relative humidity into a corresponding electrical signal, and transmit the electrical signal to the control module 4. Preferably, the relative humidity range of the humidity sensor 202 may be set to less than 5%.
Preferably, the humidity sensor 202 has a temperature and pressure compensation function for monitoring the intake air humidity, and the control module 4 and the display module 5 are used for setting and displaying the threshold value.
Alternatively, as shown in fig. 2, the pressure monitoring module 3 is provided with a first port 31, a second port 32, a third port 33 and a fourth port 34. The first port 31 is connected with the gas sensor 1, the second port 32 is connected with the rotameter 6, the third port 33 is provided with a micro-pressure sensor 301, the micro-pressure sensor 301 is electrically connected with the control module 4, the fourth port 34 is provided with a pressure discharge valve 302, and the control end of the pressure discharge valve 302 is electrically connected with the control module 4.
In the present embodiment, the micro pressure sensor 301 can be understood as a sensor for precisely measuring a minute pressure change, which is capable of providing pressure data of high sensitivity and high accuracy during gas monitoring and converting it into a corresponding electrical signal.
Specifically, the pressure monitoring module 3 is provided with a first port 31, a second port 32, a third port 33, and a fourth port 34. Preferably, the first port 31, the second port 32, the third port 33 and the fourth port 34 are accessed in a four-way form, and the third port 33 and the fourth port 34 are disposed opposite to each other. The first port 31 is connected to the gas sensor 1, and is specifically configured to receive gas pressure data from the gas sensor 1, so as to monitor a pressure state of the gas and perform subsequent analysis and processing. The second port 32 is connected to the rotameter 6, specifically for monitoring the change in gas flow, and the rotameter 6 can provide real-time flow data according to the flow conditions of the fluid, helping the system evaluate the efficiency and stability of the gas flow. The third port 33 is provided with a micro pressure sensor 301 and is electrically connected to the control module 4 for transmitting pressure data in real time and monitoring. The fourth port 34 is provided with a pressure relief valve 302, specifically for controlling the gas venting in the system to maintain the pressure balance of the system. The control end of the pressure discharge valve 302 is electrically connected with the control module 4, so that the control end can quickly respond to the instruction of the control module, and accurate pressure regulation and release can be realized. With these arrangements, the pressure monitoring module 3 can comprehensively monitor the pressure and flow conditions of the gas, ensuring stable operation and safety of the system.
Preferably, the relative pressure range of the pressure monitoring module 3 is smaller than-500 Pa to +500Pa.
Preferably, the rotameter 6 can control flow, the emptying valve 302 can control opening degree manually, and the emptying valve is arranged on the front panel of the instrument body, so that the operation is convenient.
Optionally, referring to fig. 2, the humidity monitoring module 2 is provided with a first temperature compensation unit 203 and/or a pressure compensation unit for compensating and correcting the intake air humidity, and the pressure monitoring module 3 is provided with a second temperature compensation unit 303 for compensating and correcting the internal pressure.
In the present embodiment, the first temperature compensation unit 203 can be specifically understood as a device for compensating and correcting the humidity of the intake air, so as to ensure the accuracy of humidity measurement under different temperature conditions. The first temperature compensation unit 203 can monitor the intake air temperature in real time, and correspondingly adjust the reading of the humidity sensor 202 through a control algorithm, so as to eliminate humidity measurement errors caused by temperature changes and improve the reliability of humidity measurement. The second temperature compensation unit 303 may be specifically understood as a device for monitoring and compensating for internal pressure fluctuations due to temperature changes, the second compensation unit 303 being capable of monitoring internal pressure fluctuations due to temperature changes, ensuring accuracy of pressure measurement, and adjusting the output of the micro pressure sensor 301 by a control algorithm to eliminate the influence of temperature changes on internal pressure measurement.
Specifically, the humidity monitoring module 2 is provided with a first temperature compensation unit 203 and/or a pressure compensation unit for compensating and correcting the intake air humidity, and the pressure monitoring module 3 is provided with a second temperature compensation unit 303 for compensating and correcting the internal pressure. Through the arrangement of the compensation units, the humidity monitoring module 2 and the pressure monitoring module 3 can effectively improve the measurement precision, and ensure the stable operation of the system under various environmental conditions.
In some embodiments, the control module 4 is configured to determine a humidity threshold for the humidity monitoring module 2 based on the first operating condition and to evaluate the intake air humidity for anomalies based on the humidity threshold. Wherein the first operating condition is established based on the intake data of the meter inlet 7 and the pre-processing data of the pre-processing module 5. In the present embodiment, the intake data of the meter intake port 7 includes, but is not limited to, the intake air amount, the intake air flow amount, and the intake air composition, and the preprocessing data of the preprocessing module 5 includes, but is not limited to, the condensation temperature. Determining the humidity threshold of the humidity monitoring module 2 according to the first operation condition comprises adjusting the intake data of the meter air inlet 7 and the preprocessing data of the preprocessing module 5 to obtain an upper humidity threshold and a lower humidity threshold. Illustratively, taking the gas sensor 1 as an example comprising a CO 2 sensor and an O 2 sensor, determining the humidity threshold of the humidity monitoring module 2 according to the first operation condition specifically comprises the steps of firstly setting the first operation condition as an instrument air inlet 7, and introducing full-scale CO 2 standard gas (CO 2 with specific humidity and concentration) to perform full-scale calibration of the CO 2 sensor and zero calibration of the O 2 sensor. After the data collected by the humidity monitoring module 2 are stable, the air inlet humidity measured by the humidity monitoring module 2 is set to be a humidity lower limit threshold. Then, the first operation condition is set to be that the equipment (such as a generator set) generating the smoke works in a full-load stable operation state, the pretreatment condensation temperature is set to be 2 ℃, and the inlet air humidity measured by the humidity monitoring module 2 is set to be a humidity upper limit threshold. In some embodiments, the value of the humidity threshold may be adjusted based on a particular threshold update period (e.g., one quarter or half year). In this embodiment, the abnormal intake air humidity is evaluated based on the humidity threshold, specifically, when the actually monitored intake air humidity exceeds the upper humidity threshold or the intake air humidity is lower than the lower humidity threshold, the control module 4 will display "abnormal intake air", and prompt the operation and maintenance personnel to check the pretreatment condensing device or pipeline, so as to prevent the performance of the gas sensor from being negatively affected by the excessive humidity. The humidity threshold value configuration inaccuracy caused by seasonal or instrument difference is avoided by regularly configuring the threshold value of the humidity monitoring module 2, so that humidity abnormality can be found in time conveniently, error detection of the humidity abnormality is avoided, the running efficiency of equipment is optimized, the maintenance cost is reduced, the stability of the system is enhanced, and data support is provided for subsequent operation decisions.
In other embodiments, the control module 4 is configured to determine a calibration reference value and a pressure threshold value for the pressure monitoring module 3 based on a second operating condition established based on the intake data of the meter intake port 7 and the flow data of the rotameter 6, and to evaluate the internal pressure for anomalies based on the calibration reference value and the pressure threshold value. In the present embodiment, the intake data of the meter intake port 7 includes, but is not limited to, the intake air amount, the intake air flow rate, and the intake air composition, and the flow data of the rotameter 6 includes, but is not limited to, the flow rate set value. Determining the calibration reference value and the pressure threshold value of the pressure monitoring module 3 according to the second operation condition comprises adjusting the intake data of the meter air inlet 7 and the flow data of the rotameter 6 to obtain the pressure upper limit threshold value, the pressure lower limit threshold value and the calibration reference value. Taking the gas sensor 1 as an example, the gas sensor 1 comprises a CO 2 sensor and an O 2 sensor, and determining the calibration reference value and the pressure threshold value of the pressure monitoring module 3 according to the second operation condition specifically includes that firstly, the second operation condition is set to be that the gas inlet 7 is filled with flue gas, the meter is normally used, and the pressure discharge valve 302 of the pressure monitoring module 3 is kept in a closed state under the condition that the rotor flow is stabilized at about 1L/min. When the CO 2、O2, pressure and humidity values have all stabilized, the relative pressure measured by the pressure monitoring module 3 will be set as the calibration reference value. Next, the second operation condition is set to be that the air inlet 7 is filled with standard air (CO 2 with specific humidity and concentration), and the outlet pressure of the valve of the standard air bottle is adjusted to be high, and meanwhile, the flow set value of the rotameter 6 is adjusted to be small, so that the flow is kept basically unchanged until the measured value of the concentration of CO 2 changes, and the pressure measured by the pressure monitoring module 3 is set to be the upper pressure threshold. The second operating mode is set to set the inlet 7 to be supplied with standard gas (CO 2 with specific humidity and concentration), and the outlet pressure of the standard gas cylinder valve is adjusted down, and the flow set value of the rotameter 6 is increased at the same time, so as to maintain the flow basically unchanged, until the measured value of the concentration of CO 2 changes again, at which time the pressure measured by the pressure monitoring module 3 is set as the pressure lower limit threshold. In this embodiment, the internal pressure is evaluated abnormally based on the calibration reference value and the pressure threshold, specifically, when the control module 4 finds that the internal pressure exceeds the upper pressure threshold or the internal pressure is lower than the lower pressure threshold, the control module displays "pressure abnormality", prompts maintenance personnel to check the pipeline and adjust the flow rate so that the pressure is maintained near the calibration reference value, so as to ensure that the gas sensor operates in a normal pressure range. By regularly configuring the threshold value and the calibration reference value of the pressure monitoring module 3, inaccurate configuration of the pressure threshold value and the calibration reference value caused by seasonal or instrument difference is avoided, pressure abnormality can be found in time conveniently, false detection of the pressure abnormality is avoided, equipment operation efficiency is optimized, maintenance cost is reduced, system stability is enhanced, and data support is provided for subsequent operation decisions.
In other embodiments, the control module 4 is configured to zero calibrate the pressure monitoring module 3 based on a third operating condition established based on the intake data of the meter intake 7, the operational state of the rotameter 6, and the operational state of the pressure monitoring module 3. In the present embodiment, the intake data of the meter intake port 7 includes, but is not limited to, the intake air amount, the intake air flow rate, and the intake air composition, the operation state of the rotameter 6 includes, but is not limited to, whether the flowmeter is open, and the operation state of the pressure monitoring module 3 includes, but is not limited to, whether the discharge pressure valve 302 is open. Zero calibration of the pressure monitoring module 3 is performed according to the third operating condition, including adjusting the intake data of the meter air inlet 7, the operating state of the rotameter 6, and the operating state of the pressure monitoring module 3 to obtain a zero calibration value. Illustratively, zero calibration of the pressure monitoring module 3 based on the third operating condition includes, in particular, first, setting the third operating condition to shut off the meter inlet 7 via the control module 4 while closing the rotameter 6 and then opening the pressure relief valve 302. At this time, the measured internal pressure of the pressure monitoring module 3 will be set to the zero point calibration value. In some embodiments, the particular operation of zero calibration of the pressure monitoring module 3 may be performed during manual maintenance, and the value of the zero calibration value may be adjusted based on a particular zero calibration value update period (e.g., one quarter) to ensure accuracy and reliability of the device. By carrying out zero calibration on the pressure monitoring module 3, inaccurate configuration of pressure zero calibration values caused by seasonal or instrument difference is avoided, stability of the system under different running conditions is ensured conveniently, and reliable data support is provided for subsequent operation decisions.
In other embodiments, the control module 4 is configured to zero calibrate and full scale calibrate the gas sensor 1 according to a fourth operating condition established based on intake data of the meter inlet 7. In the present embodiment, the intake data of the meter intake port 7 includes, but is not limited to, the intake air amount, the intake air flow amount, and the intake air composition. Zero calibration and full scale calibration of the gas sensor 1 are performed according to the fourth operating condition, including adjusting the intake data of the meter intake port 7 to obtain a zero calibration value and a full scale calibration value. Illustratively, taking the gas sensor 1 as an example, the gas sensor 1 comprises a CO 2 sensor and an O 2 sensor, performing zero calibration and full-scale calibration on the gas sensor 1 according to a fourth operating condition, and specifically comprises setting the fourth operating condition to be that air is introduced into an instrument air inlet 7 at intervals of a first set time (for example, 4 to 12 hours), so as to perform zero calibration on the CO 2 sensor and full-scale calibration on the O 2 sensor. The fourth operating condition is set to be that the full-scale CO 2 standard gas (CO 2 with specific humidity and concentration) is introduced into the control instrument air inlet 7 at intervals of a second set time (such as one week) so as to perform full-scale calibration of the CO 2 sensor and zero point calibration of the O 2 sensor. In some embodiments, the introduction of the full scale CO 2 standard gas may be performed by manual operation, or may be switched to automatic operation after the manual operation is connected to the standard gas, but it is necessary to ensure that the detection value of the micro-pressure sensor 301 remains around the calibration reference value all the time. By performing zero calibration and full-scale calibration on the gas sensor 1, inaccurate configuration of the zero calibration value and the full-scale calibration value of the gas sensor caused by seasonal or instrument difference is avoided, stability of the system under different running conditions is ensured conveniently, and reliable data support is provided for subsequent operation decisions.
Example two
Fig. 3 is a flowchart of a smoke monitoring method according to a second embodiment of the present invention, where the smoke monitoring method is implemented based on the smoke monitoring device described above, and the smoke monitoring device is provided with a humidity monitoring module, a pressure monitoring module, and a gas sensor, where the humidity monitoring module is used to monitor the humidity of intake air, and the pressure monitoring module is used to monitor the internal pressure of the gas sensor. Referring to fig. 3, the method includes:
s110, configuring the operation condition of the smoke monitoring device.
And S120, performing threshold setting and calibration on at least one of the humidity monitoring module, the pressure monitoring module or the gas sensor based on the operation condition.
Referring to FIG. 1, in some embodiments, thresholding and calibrating at least one of the humidity monitoring module, the pressure monitoring module, or the gas sensor based on operating conditions includes determining a humidity threshold for the humidity monitoring module based on a first operating condition and performing an abnormal assessment of intake air humidity based on the humidity threshold, and/or determining a calibration reference value and a pressure threshold for the pressure monitoring module based on a second operating condition and performing an abnormal assessment of internal pressure based on the calibration reference value and the pressure threshold.
The first operation condition is established based on the air inlet data of the instrument air inlet and the preprocessing data of the preprocessing module, and the second operation condition is established based on the air inlet data of the instrument air inlet and the flow data of the rotameter.
With continued reference to FIG. 1, in other embodiments, at least one of the humidity monitoring module, the pressure monitoring module, or the gas sensor is thresholded and calibrated based on operating conditions, further including zero calibration of the pressure monitoring module according to a third operating condition and/or zero calibration and full scale calibration of the gas sensor according to a fourth operating condition.
The third operation condition is established based on air inlet data of the instrument air inlet, the working state of the rotameter and the working state of the pressure monitoring module, and the fourth operation condition is established based on the air inlet data of the instrument air inlet.
S130, carrying out abnormal evaluation on the intake air humidity and the internal pressure.
According to the technical scheme, the operation working condition of the smoke monitoring device is configured, threshold setting and calibration are carried out based on the operation working condition, and abnormal assessment is carried out on the inlet air humidity and the internal pressure. Whether the air inlet humidity (the dryness is completely or is lower than a certain humidity threshold) and the pressure inside the sensor (the pressure is in a certain range) meet detection conditions can be directly judged, whether the front-end pretreatment link is abnormal or not can also be indirectly judged, a basis is provided for adjusting the detection conditions of the instrument, a new control dimension is added for the operation and maintenance of the instrument, and the detection accuracy of the instrument is improved.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides a flue gas monitoring devices, includes the instrument body and set up in the gas sensor in the instrument body, gas sensor connects the instrument air inlet through preprocessing module, gas sensor connects the instrument gas outlet through rotameter, its characterized in that, flue gas monitoring devices still includes:
the humidity monitoring module is arranged on the air inlet pipeline between the gas sensor and the pretreatment module and is used for monitoring the air inlet humidity of the air inlet pipeline;
the pressure monitoring module is arranged on an air outlet pipeline between the gas sensor and the rotameter and is used for monitoring the internal pressure of the gas sensor;
the control module is respectively connected with the humidity monitoring module and the pressure monitoring module and is used for configuring the operation working condition of the flue gas monitoring device, setting and calibrating a threshold value of at least one of the humidity monitoring module, the pressure monitoring module or the gas sensor based on the operation working condition, and carrying out abnormal evaluation on the inlet air humidity and the internal pressure.
2. The smoke monitoring device of claim 1, wherein the control module is configured to:
determining a humidity threshold of the humidity monitoring module according to a first operating condition, and carrying out abnormal assessment on the air inlet humidity based on the humidity threshold, and/or,
Determining a calibration reference value and a pressure threshold value of the pressure monitoring module according to a second operation condition, and carrying out abnormal evaluation on the internal pressure based on the calibration reference value and the pressure threshold value;
the first operation condition is established based on air inlet data of an air inlet of the instrument and preprocessing data of the preprocessing module;
The second operating condition is established based on intake data of the meter inlet and flow data of the rotameter.
3. The smoke monitoring device of claim 1, wherein the control module is further configured to:
zero calibration of the pressure monitoring module is performed according to a third operating condition, and/or,
Zero calibration and full-scale calibration are carried out on the gas sensor according to a fourth operation condition;
the third operation condition is established based on air inlet data of an air inlet of the instrument, the working state of the rotameter and the working state of the pressure monitoring module;
The fourth operating condition is established based on intake data of the meter inlet.
4. The smoke monitoring device of claim 1, further comprising a display module coupled to the control module, the display module configured to display at least one of:
An operation condition configuration window;
The intake air humidity;
The internal pressure;
A humidity threshold of the humidity monitoring module;
A calibration reference value and/or a pressure threshold value of the pressure monitoring module;
An intake abnormality evaluation result;
And (5) evaluating results of pressure abnormality.
5. The flue gas monitoring device of any one of claims 1 to 4, wherein the humidity monitoring module comprises a drying tube;
a drying agent is arranged in the drying pipe, and the drying agent undergoes a color change reaction according to the air inlet humidity;
the drying pipe is at least partially provided with an observation part, and the observation part is used for displaying the color change reaction result.
6. The smoke monitoring device of claim 5, wherein the observation portion is provided with graduation marks for displaying a numerical value corresponding to the color change reaction result, and/or,
The drying pipe is arranged on an instrument panel or a surface-protruding part of the instrument body.
7. The flue gas monitoring device of claim 5, wherein the humidity monitoring module further comprises a humidity sensor disposed between the drying tube and the pretreatment module;
the humidity sensor is used for converting the air inlet humidity into an electric signal and transmitting the electric signal to the control module.
8. The smoke monitoring device of any one of claims 1-4, wherein the pressure monitoring module is provided with a first port, a second port, a third port and a fourth port;
the first port is connected with the gas sensor;
The second port is connected with the rotameter;
the third port is provided with a micro-pressure sensor, and the micro-pressure sensor is electrically connected with the control module;
The fourth port is provided with a pressure discharge valve, and the control end of the pressure discharge valve is electrically connected with the control module.
9. The flue gas monitoring device according to any one of claims 1 to 4, wherein the humidity monitoring module is provided with a first temperature compensation unit and/or a pressure compensation unit for compensating the inlet air humidity;
the pressure monitoring module is provided with a second temperature compensation unit for compensating and correcting the internal pressure.
10. A flue gas monitoring method, characterized in that it is realized based on a flue gas monitoring device according to any one of claims 1 to 9, said flue gas monitoring device being provided with a humidity monitoring module for monitoring the humidity of the inlet air, a pressure monitoring module for monitoring the internal pressure of said gas sensor, and a gas sensor, said method comprising:
configuring the operation condition of the smoke monitoring device;
Threshold setting and calibrating at least one of the humidity monitoring module, the pressure monitoring module or the gas sensor based on the operating conditions;
and performing abnormality evaluation on the intake air humidity and the internal pressure.
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