CN110471384A - A kind of PTA device advanced control system - Google Patents
A kind of PTA device advanced control system Download PDFInfo
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- CN110471384A CN110471384A CN201910797545.2A CN201910797545A CN110471384A CN 110471384 A CN110471384 A CN 110471384A CN 201910797545 A CN201910797545 A CN 201910797545A CN 110471384 A CN110471384 A CN 110471384A
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- oxidation reactor
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Program-control systems
- G05B19/02—Program-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
- G05B19/4183—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM] characterised by data acquisition, e.g. workpiece identification
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Program-control systems
- G05B19/02—Program-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
- G05B19/41875—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM] characterised by quality surveillance of production
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Quality & Reliability (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Feedback Control In General (AREA)
Abstract
The invention discloses a kind of PTA device advanced control systems, comprising: for monitoring the DCS server of the working condition of p-phthalic acid's PTA workshop, which further includes the acquisition module for detecting manufacturing parameter information in DCS server；Receive the multivariable predictive controller of the manufacturing parameter information of the acquisition module transmission, the multivariable predictive controller optimizes control according to inlet amount of the optimization object function to oxidation reactor, wherein the constraint condition of optimization object function feeds the air total flow range in the air intake baffle opening value range and oxidation reactor of ratio range, air compressor for air and PX, and when the production equipment in PTA workshop meets the constraint condition of optimization object function, the multivariable predictive controller regulates and controls the PX inlet amount of oxidation reactor.
Description
Technical field
The present invention relates to PTA assembly monitor technical field more particularly to a kind of PTA device advanced control systems.
Background technique
APC advanced control system is suitable for the oxidation unit of PTA, implements the operation water that Dynamic matrix control is able to ascend device
Gentle economic benefit.The analytical plan that standard deviation reduces, which is assumed that, can reduce the 50% of fluctuation standard deviation by Dynamic matrix control,
The maximum value occurred before implementation Dynamic matrix control is assumed to be the limit value of operation, then pushing to after Dynamic matrix control implementation new
Operating point is: the change of mean value, and new mean value is closer to profitable operation limit.Benefit analysis methods most commonly assume that
Dynamic matrix control can make standard deviation reduce 25%-50%, to calculate the new mean value after implementing Dynamic matrix control.It is advanced in implementation
In control process, the circuit bad to control effect, which has carried out reason, to be checked to all important Traditional PID control loops
Analysis and scheme are improved, and the adjustment of pid control parameter is mainly carried out.
Existing PTA device uses the Experion PKS control system of HONEYWELL company, it inherits traditional DCS
The advantages of, while new technological break-through is merged again, it is a set of control system more perfect than TPS and PlantScape system.
The PID control rule that its autocontrol method still uses last century to be just widely used, most of PTA device is single input
The simple circuit of single output (SISO), only a small amount of complex control loop, as shown in Figure 1, this method advantage is algorithm letter
Single, robustness is good and high reliablity, so being widely used.But for the chemical process of production process complexity, such as PTA
For the oxidation unit of process units, there are PX, empty gas and water, solvent, the mixing of catalyst and Matter Transfer process, be related to huge
Complicated chemical reaction, there are a large amount of relation factors between each technological parameter, and wherein the variation of some variable can cause one
Parameters in series shifts, and if there is 2 or 3 variables disturb, entire technique will likely be sent out to unpredictable direction
Exhibition, regulatory PID control can only have effect of contraction to the circuit of oneself, not be suitable for serious associated process control, device load
It can only be operated by people when dynamic being needed to adjust, disadvantage is apparent.
Example as shown in figure 1, the pressure of oxidation reactor D1-301A is controlled by PICA-03243, this is a seperating range control
Circuit.B valve is a very small valve relative to A valve, is used for pressure control when reactor is driven and kept, works as pressure
Power rises, and the output of controller increases, and B valve is opened greatly.After B valve standard-sized sheet, A valve is started to open.As pressure continues to increase, A valve
Continue out big, B valve closing at this time.A, the switching point of B valve should be selected to the smallest place of process disturbance.Obvious above-mentioned point of journey
Adjusting can only be helpful to PT-03243 pressure is stablized, other technological parameters and load change, this regulating system will not
It cuts any ice.
Summary of the invention
According to problem of the existing technology, the invention discloses a kind of PTA device advanced control system, concrete schemes
Include:
For monitoring the DCS server of the working condition of p-phthalic acid's PTA workshop, wherein smart terephthaldehyde
The oxidation reactor for being used to produce p-phthalic acid PTA of two paired runnings, institute are included at least in sour PTA workshop
The output end for stating oxidation reactor is connected with the first crystallizer, output end and the later crystallization device phase of first crystallizer
Connection, the output end of the later crystallization device is connected with filter, an output end of the filter with for receiving liquid
The mother liquor tank of body ingredient is connected, another output is connected with the drying machine for receiving solid component, the drying machine
It is connected with refined unit, the output end of the mother liquor tank is connected with oxidation reactor, is also connected on the oxidation reactor
There is the air compressor for carrying out compression processing to air；
The system further includes the acquisition module for detecting manufacturing parameter information in DCS server；
The multivariable predictive controller of the manufacturing parameter information of the acquisition module transmission is received, the multivariable is estimated
Controller optimizes control according to inlet amount of the optimization object function to oxidation reactor, wherein the pact of optimization object function
Beam condition is the air intake baffle opening value range and oxidation reactor that air and PX feed ratio range, air compressor
In air total flow range, when the production equipment in PTA workshop meets the constraint condition of optimization object function described in
Multivariable predictive controller regulates and controls the PX inlet amount of oxidation reactor.
The manufacturing parameter information includes at least air mass flow, PX inlet amount, oxidation reactor pressure information, stirring speed
Rate, reflux mother liquid flow rate, catalyst flow, the temperature information of oxidation reactor and tail oxygen concentration information.
The variable-definition directly adjusted by DCS server is performance variable by the multivariable predictive controller, will not
It can be to be defined as production process external environment information by control variable by the variable-definition that DCS server is directly adjusted
Disturbance variable；The multivariable predictive controller is guaranteed by control variable by the way that performance variable is varied or adjusted in operation model
In enclosing, since disturbance variable has an impact to by control variable, then multivariable predictive controller is by estimating disturbance variable variation pair
By control variable influence degree, then adjust performance variable to overcome the interference of disturbance variable.
By adopting the above-described technical solution, a kind of PTA device advanced control system provided by the invention, the system are adopted
Precise and stable adjusting and control are carried out with production process of the advanced multivariable predictive controller to p-phthalic acid PTA
System, according to the operation data, statistical data and laboratory analysis of data for collecting oxidation unit, analysis and processing obtain reference line
Summarize.Estimate that benefit, this scheme are the marks by estimating important process variable by the experimental program of analytical standard difference
Quasi- difference reduction amplitude, APC control can make the reduction of standard deviation amplitude of variation, and such APC can push operation to closer to optimization
The place of point, to bring benefit.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, below will to embodiment or
Attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
Some embodiments as described in this application, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the operation schematic diagram of PTA device in the prior art；
Fig. 2 is the structural schematic diagram of PTA device advanced control system of the present invention；
Fig. 3 is control system implementation result schematic diagram of the present invention；
Fig. 4 is control system implementation result schematic diagram of the present invention；
Fig. 5 is PTA device advanced control system and DCS server cooperating schematic diagram in the present invention.
Specific embodiment
To keep technical solution of the present invention and advantage clearer, with reference to the attached drawing in the embodiment of the present invention, to this
Technical solution in inventive embodiments carries out clear and complete description:
A kind of PTA device advanced control system as shown in Figure 2, including a total DCS server 10, real time monitoring
The operating condition of p-phthalic acid's PTA workshop, and real-time update is carried out to the information detected.It is wherein smart right
2 sets of two oxidation reactors of front end are included at least in phthalic acid PTA workshop, this 2 sets of oxidation reactors 1 are transported side by side
Row, wherein the slurry of oxidation reactor 1 is expelled to the first crystallizer 2 from bottom, is passed through a small amount of air in the first crystallizer 2
It carries out secondary oxidation and enters later crystallization device 3, the first crystallizer 2 and later crystallization device 3 are only a set of, so 2 sets of oxidation reactions
There are certain influences between device 1.It is separated by solid-liquid separation finally by filter 4, filtrate returns to mother liquor tank 5 and sends oxygen back to again
Change and is recycled in reactor 1.Solid gives the subsequent purification of refined unit 7, final production after giving the drying of drying machine 6
PTA out.Since PX oxidation reaction is strong exothermal reaction, steaming is generated to recycle heat into oxidation reactor top condenser system
Vapour, water be reaction product and exist, if allow it assemble in the liquid phase, it will slow down or inhibit reaction rate.Cause
This, it is necessary to water is continuously extracted out from reactor, and by solution again by mother liquor tank 5 be back to oxidation reactor 1 into
Row recycles, so that the electric energy that high-temperature steam generates be used for such as air compressor 11.
Wherein the system further includes the acquisition for detecting the manufacturing parameter information of oxidation reactor 1 during the reaction
Module 8.
The multivariable predictive controller 9 for the manufacturing parameter information that the acquisition module 8 transmits is received, the multivariable is pre-
Estimate controller 9 and control is optimized according to inlet amount of the optimization object function to oxidation reactor 1, wherein optimization object function
Constraint condition be meet air and PX charging ratio range, air compressor 11 air intake baffle opening value range and
Air total flow range in oxidation reactor 1, when the production equipment in PTA workshop meets the pact of optimization object function
The multivariable predictive controller 9 regulates and controls the PX inlet amount of oxidation reactor 1 when beam condition.
The multivariable predictive controller 9 exports the maximum PX charging magnitude met under the constraint condition.At this moment device will
It is run near constraint, realizes the maximization of feed throughput.Even and if occurring other restrictive conditions sometimes, such as when certain
A capacity of equipment reaches limit value, so that influencing other parameters can not adjust, multivariable predictive controller 9 will voluntarily find optimal
The regulation scheme of change, by adjusting other performance variables, without reducing treating capacity, Lai Shixian maximizing the benefits.
Further, the manufacturing parameter information includes at least air mass flow, stirring rate, reflux mother liquid flow rate, catalysis
Agent flux, the temperature information of oxidation reactor 1 and tail oxygen concentration information.Specifying information is referring to following table
Above table only lists the key variables of acquisition, and secondary variable is not listed one by one, connected using OPC, DCS clothes
All process variables and various intermediate variables of business device 10 can be directly read, as shown in Figure 5.
Further, the target of multivariable predictive controller 9 is to maximize crude terephthalic acid CTA product yield or right
Dimethylbenzene PX treating capacity, by stablizing oxidation reactor 1, maintained lower reaction temperature, minimize acetic acid burning, logical
The outlet pressure for crossing adjustment air compressor 11 in due course minimizes the electricity consumption of air compressor 11, therefore specific implementation process
In, multivariable predictive controller 9 receives the multinomial manufacturing parameter information of acquisition module 8, is analyzed and then obtained reference line
Summarize data, the control program of PTA device is carried out it is perfect: according to our primary goal maximize PX treating capacity, in single set
PX treating capacity is improved by current 90Ton/Hr to 91Ton/Hr in oxidation reactor, other response parameters of reactor are automatic
Adjustment is followed, as air mass flow, stirring rate, reflux mother liquid flow rate, catalyst flow, reactor water discharge high pressure and absorb
A series of variables such as tower flow, solvent ratio find optimal control according to obtained dynamic model by multivariable predictive controller 9
Parameter processed submits to DCS server 10, and entire oxidation technology is allowed to always work in optimal state.In actual operation, I
Successfully PX treating capacity is improved to 91Ton/Hr, improve yield.We, which think further to excavate using this Dynamic matrix control, produces
Energy limit sees when whether can reach 92Ton/Hr alarm occur, and air compressor has reached extreme compressibility still not
It is able to satisfy air ratio, the air compressing capability of equipment becomes bottleneck.
Further, 9 storage inside of multivariable predictive controller has performance variable or manipulating variable, is become by control
Amount and disturbance variable information.The variable-definition directly adjusted by DCS server 10 is by the multivariable predictive controller 9
Performance variable, it is impossible to which the variable-definition directly adjusted by DCS server 10 is by control variable, by production process China and foreign countries
Portion's environmental information is defined as disturbance variable；The multivariable predictive controller 9 guaranteed by the way that performance variable is varied or adjusted by
Variable is controlled in opereating specification, since disturbance variable has an impact to by control variable, then multivariable predictive controller 9 passes through
Estimate disturbance variable variation to by control variable influence degree, then adjust performance variable to overcome the interference of disturbance variable.
Such as performance variable (variable that can be directly adjusted by DCS) is such as, catalyst flow, air mass flow, PX charging
The variables such as amount, reactor pressure, for advanced control system, this is exported to the SP setting value of DCS.It is (logical by control variable
Cross the variable that DCS server 10 cannot be adjusted directly), but will receive the indirect influence of performance variable.For example, tail oxygen concentration, anti-
Answer the information such as pressure difference, the 4-CBA impurity content between water content in device, temperature of reactor, air compressor machine and reactor.Interference becomes
Amount: for example, the information such as ambient air temperature, flow, pressure oscillation.
The multivariable predictive controller 9 guarantees to be become by control by the way that performance variable or manipulating variable is varied or adjusted
Amount is in opereating specification, and since disturbance variable has an impact to by control variable, then multivariable predictive controller 9 is dry by estimating
Variable change is disturbed to the influence degree by control variable, by adjusting performance variable or manipulating variable to overcome disturbance variable
Interference.
Further, oxidation reactor shares 2 sets, paired running, it is single cover oxidation reactor PX treating capacity successfully improve to
After 91Ton/Hr, same method is used to B covering device, also successful operation, so far, 2 sets of reactors, which complete, promotes yield
Task.Such as be to implement A set reactor output to promote effect diagram in Fig. 3, Fig. 4 is to implement B set reactor output to promote effect
Fruit schematic diagram.
In order to reduce air compressor energy consumption, most direct means be reduce exit pressure for air compressor to
It realizes energy conservation, but the reduction of reactor oxidation reaction speed will be caused after reducing pressure, in order to reach same product quality, just
It needs to increase the residence time of material in oxidation reactor, increases the dosage of catalyst indirectly.So it causes into instead
This increase, this target are not carried out.
By adopting the above-described technical solution, a kind of PTA device advanced control system provided by the invention, steady in production
Operation data in fixed PTA oxidation unit acquisition certain time is representative quiet run operating condition, this period
The performance of PTA oxidation unit can be used as the reference line of Dynamic matrix control implementation.According to the operand for collecting oxidation unit
According to, statistical data and laboratory analysis of data, analysis and processing obtain summarizing for reference line.Pass through the experiment side of analytical standard difference
Case estimates benefit, and this scheme is by estimating that the standard deviation of important process variable reduces amplitude, APC control can make to mark
Quasi- difference amplitude of variation reduces, and such APC can push operation to closer to the place of optimization point, to bring benefit.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited to
This, anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention
And its inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (3)
1. a kind of PTA device advanced control system characterized by comprising
For monitoring the DCS server (10) of the working condition of p-phthalic acid's PTA workshop, wherein p-phthalic acid
The oxidation reactor (1) for being used to produce p-phthalic acid PTA of two paired runnings, institute are included at least in PTA workshop
The output end for stating oxidation reactor (1) is connected with the first crystallizer (2), the output end of first crystallizer (2) with it is subsequent
Crystallizer (3) is connected, and the output end of the later crystallization device (3) is connected with filter (4), and the one of the filter (4)
A output end is connected with the mother liquor tank (5) for receiving liquid component, another output with for receiving solid component
Drying machine (6) is connected, and the drying machine (6) is connected with refined unit (7), the output end of the mother liquor tank (5) and oxidation
Reactor (1) is connected, and the air compressor for carrying out compression processing to air is also connected on the oxidation reactor (1)
(11)；
The system further includes the acquisition module (8) for detecting the interior manufacturing parameter information of DCS server (10)；
The multivariable predictive controller (9) of the manufacturing parameter information of the acquisition module (8) transmission is received, the multivariable is estimated
Controller (9) optimizes control according to inlet amount of the optimization object function to oxidation reactor (1), wherein optimization object function
Constraint condition be air intake baffle opening value range and oxidation that air and PX feed ratio range, air compressor (11)
Air total flow range in reactor (1), when the production equipment in PTA workshop meets the constraint item of optimization object function
The multivariable predictive controller (9) regulates and controls the PX inlet amount of oxidation reactor (1) when part.
2. a kind of PTA device advanced control system according to claim 1, it is further characterized in that: the manufacturing parameter letter
Breath includes at least air mass flow, PX inlet amount, oxidation reactor (1) pressure information, stirring rate, reflux mother liquid flow rate, catalysis
Agent flux, the temperature information of oxidation reactor (1) and tail oxygen concentration information.
3. a kind of PTA device advanced control system according to claim 2, it is further characterized in that: the multivariable is estimated
Controller (9) will be performance variable by the variable-definition that DCS server (10) are directly adjusted, it is impossible to pass through DCS server
(10) variable-definition directly adjusted is that production process external environment information is defined as disturbance variable by control variable；Institute
Multivariable predictive controller (9) is stated to guarantee by the way that performance variable is varied or adjusted by control variable in opereating specification, due to
Disturbance variable has an impact to by control variable, then multivariable predictive controller (9) is by estimating disturbance variable variation to being controlled
The influence degree of variable adjusts performance variable then to overcome the interference of disturbance variable.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113176767A (en) * | 2021-04-30 | 2021-07-27 | 北京瑞飞华亿科技有限公司 | Propylene recovery control system |
| CN118092324A (en) * | 2023-11-15 | 2024-05-28 | 沾化立诚精细化工有限公司 | A chemical production control system based on the Internet of Things |
| CN119247899A (en) * | 2024-09-26 | 2025-01-03 | 中控技术股份有限公司 | An advanced control system and method for a carbon two pre-hydrogenation reactor |
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Application publication date: 20191119 |