WO2015158016A1 - Industrial treatment method and device for oil field wastes - Google Patents

Abstract

An industrial treatment method for oil field wastes comprises: performing sampling analysis on oil field wastes, and preheating to 80°C to 300°C using high-temperature steam or thermal conduction oil; then performing microwave pyrolysis treatment, controlling pressure at -5000 to -100 Pa, and obtaining treated solid substances and gas; condensing, separating and purifying the gas and recycling the gas so as to obtain water, oil and non-condensable gas. An industrial treatment device for oil field wastes comprises a feed hopper, a dryer, a microwave heating cavity, a microwave generator, a heating device, and a condensation, separation and purification device. The feed hopper is connected to the dryer. The dryer is connected to the microwave heating cavity. A steam or thermal conduction oil outlet of the heating device is connected to a steam or thermal conduction oil inlet of the dryer. Gas outlets of the dryer and the microwave heating cavity are both connected to the condensation, separation and purification device. The microwave generator is connected to the microwave heating cavity. The treatment method and device have good treatment effects, high energy utilization rate and high economic efficiency.

Description

 Industrial treatment method and device for oil field waste

 The present application claims priority to Chinese Patent Application No. 201410155734.7, entitled "Industrial Processing Method for Oil Field Wastes and Apparatus" thereof, filed on April 17, 2014, the entire contents of which are incorporated herein by reference. In this application.

TECHNICAL FIELD The present invention relates to the field of oil field waste treatment, and more particularly to an industrial treatment method for oil field waste and a device thereof.

Background technique

 Oilfield waste generally refers to cuttings, water-based mud and oil-based mud generated during drilling, oily sludge and sediment generated during operation of oil and oil wells, soil contaminated with crude oil, and storage of crude oil in storage tanks. Tank bottom sediments, etc. In addition to certain petroleum substances, oilfield waste also contains a large amount of toxic substances such as benzene, phenols, strontium and barium, salts and heavy metals such as copper, rhodium, chromium and mercury. These oilfield wastes are not easy to handle. It takes hundreds of years to completely decompose under natural conditions. It not only directly occupies land and space, but also seriously pollutes the air, soil and groundwater, which restricts the production and development of the petroleum industry to a certain extent.

 With the continuous improvement of the requirements of national environmental protection regulations and standards, environmental protection law enforcement has been continuously increased, and pollution control and resource utilization of oilfield wastes have become the focus of the industry's sustainable development. For the harmless and resource treatment of oilfield waste, it now mainly includes quenching and tempering, separation and extraction treatment technology, curing treatment technology, incineration treatment technology, biological treatment technology, reinjection and blending technology, and pyrolysis treatment technology.

 Usually, pyrolysis technology uses electric heating or gas, fuel, and coal-fired heating methods, and its heat transfer is mainly through heat conduction, convection, and radiation. These conventional heating pyrolysis methods have low heating efficiency, and the processed products are required to meet national standards, and often consume more energy and have lower economic efficiency.

Summary of the invention

 The technical problem solved by the invention is to provide an industrial treatment method and device for oil field waste, which has good treatment effect, high energy utilization rate and good economy.

 The invention discloses an industrial treatment method for oil field waste, comprising the following steps:

(A) After the sample analysis of the oilfield waste, the oil field is heated by steam heating or heat transfer oil. The waste is preheated to 80~300 °C, and the pretreated solid product and gas are obtained. The gas is separated and purified by condensation, and water, oil and non-condensable gas are recovered, and the recovered oil and non-condensable gas are used for a fuel heated by steam or heat transfer oil;

 (B) subjecting the pretreated solid product to microwave pyrolysis treatment at a controlled pressure of -5000 to 100 Pa to obtain a solid treatment product and a gas having a total petroleum hydrocarbon content of less than 3%;

 The gas is subjected to condensation separation and purification treatment to recover water and oil, and the recovered oil is used for steam heating or heat transfer oil heating.

 Preferably, in the step A), the pre-heat treatment controls the oxygen content to be less than 7%.

 Preferably, in the step B), the microwave pyrolysis treatment controls the oxygen content to be less than 7%. Preferably, the step B) further comprises spraying the lyophilized or solidified treatment. The invention discloses an industrial processing device for oil field waste, comprising:

 Feed hopper, dryer, microwave heating chamber, microwave generator, heating device and condensation separation and purification device;

 The feed hopper is connected to the feed end of the dryer;

 a discharge end of the dryer is connected to a feeding end of the microwave heating chamber;

 The heating device is a steam boiler or a heat transfer oil boiler, and a steam outlet or a heat transfer oil outlet of the heating device is connected to a steam inlet or a heat transfer oil inlet of the dryer;

 The gas outlet of the dryer and the gas outlet of the microwave heating chamber are connected to the condensation separation purification device;

 The microwave generator is coupled to a microwave heating chamber.

 Preferably, the air lock or the conveying device is further included; the conveying device is a feeding screw and a rotating material feeding device which are sequentially connected, and the feeding hopper and the feeding end of the dryer are connected or conveyed by an air lock. Device connection.

 Preferably, a discharge spiral is further included, and the discharge spiral is connected to the discharge end of the microwave heating chamber.

 Preferably, a first circulating water jacket is disposed outside the discharging spiral casing, and a second circulating water jacket is disposed outside the feeding spiral casing, and the first circulating water jacket passes through the cold and hot water pipelines. Connected to the second circulating water jacket.

Preferably, the condensing separation and purification device comprises a dust remover, a condenser, a fan, an exhaust gas purifying device, a gravity settler, and a water separator. The connection sequence is that the dust collector is connected to the condenser, and the gas outlet of the condenser is connected to the exhaust gas purifying device through the fan; the liquid outlet of the condenser is connected with the gravity settler; the water outlet of the gravity settler is connected with the oil water separator.

 Preferably, the exhaust gas outlet of the heating device is connected to the inert gas inlet of the dryer or microwave heating chamber.

 The present invention provides an industrial treatment method for oil field waste as compared with the prior art. Firstly, according to the component analysis data of the obtained oilfield waste, the present application performs preheating and microwave pyrolysis treatment; the microwave heating rate is fast, the penetration is high, the processing efficiency and the heating uniformity are superior to the conventional ones. Pyrolysis technology, high economic feasibility. Secondly, microwave preheating at -5000-100 Pa pressure can reduce the boiling point of the oil in the material, increase the gasification rate of the oil, reduce the energy consumption in the microwave pyrolysis stage, and have high processing efficiency. Thirdly, the gas generated by the pretreatment and the microwave pyrolysis treatment is condensed, separated, purified and treated, and the obtained oil and non-condensable gas are used for fuel heated by steam heating or heat transfer oil to realize fuel self-sufficiency and have high energy utilization rate. And economic. Finally, the preheating stage can greatly remove the water in the oil field waste, reduce the amount of water vapor generated during the microwave pyrolysis stage, and reduce the chance of "ignition".

 The invention completes the pre-heat treatment in the dryer, and then delivers the pre-treated solid product to the microwave heating chamber to complete the microwave pyrolysis treatment, and the gas generated in the pre-treatment stage and the microwave pyrolysis treatment stage uses the condensation separation and purification device to complete the vapor-liquid separation. And purification and recycling.

DRAWINGS

 1 is a schematic structural view of an industrial treatment apparatus for oil field waste provided in Embodiment 1; FIG. 2 is a schematic structural view of an industrial treatment apparatus for oil field waste provided in Embodiment 2; FIG. 3 is an oil field waste provided by Embodiment 3. FIG. 4 is a schematic structural view of an industrial processing apparatus for oil field waste provided in Embodiment 4. FIG.

detailed description

 In order to further understand the present invention, the preferred embodiments of the present invention are described in the accompanying drawings.

 The embodiment of the invention discloses an industrial processing method for oil field waste, which comprises the following steps:

(A) Performing a sample analysis of oilfield waste, using steam heating or heat transfer oil to heat the oil field The waste material is preheated to 80~300 ° C to obtain a pretreated solid product and gas, and the gas is separated and purified by condensation, and water, oil and non-condensable gas are recovered; the recovered oil and non-condensable gas are used for a fuel heated by steam or heat transfer oil;

 (B) subjecting the pretreated solid product to microwave pyrolysis treatment at a controlled pressure of -5000 to 100 Pa to obtain a solid treatment product and a gas having a total petroleum hydrocarbon content of less than 3%;

 The gas is subjected to condensation separation and purification treatment, and water and oil are recovered, and the recovered oil is used for steam heating or heat-conducting oil-heated fuel; the solid processed material is sprayed and then wet or solidified, and discharged for storage and transportation. .

In the present invention, the oilfield waste is subjected to sample analysis to determine the basic composition of the oilfield waste, and the required final pyrolysis temperature can be calculated according to the processing requirements. The present invention has no particular limitation on the calculation method. In the pretreatment stage, the material is preheated to 80 300 ° C, preferably 85 to 95 ° C, by steam heating or heat transfer oil heating to obtain pretreated solid products and gases. The gas is a mixture of water vapor and C1 to C7 hydrocarbons. The gas is subjected to condensation separation and purification treatment to obtain water, oil and non-condensable gas, and the recovered oil and non-condensable gas are used for fuel heated by steam heating or heat transfer oil, thereby saving energy and improving energy utilization. In the pretreatment, it is preferred to control the oxygen content to be less than 7% to prevent the petroleum waste from generating a flammable or explosive gas to cause fire or explosion. Preferably, the method for controlling the oxygen content is that after the steam pan is obtained from the pretreated solid product, it is subjected to microwave pyrolysis treatment, the control pressure is -5000-100 Pa, and the pressure is preferably -1000-200 Pa, and the total is obtained. A solids treatment and gas having a petroleum hydrocarbon content of less than 3%. Due to the complex composition of the oilfield waste, the present application can appropriately adjust the output power of the microwave generator in the microwave pyrolysis stage according to its composition, and achieve the matching of the operating parameters and the processing requirements, and save energy. According to different processing standards Preferably, the resulting solid treatment preferably has a total petroleum hydrocarbon content of less than 1%. When the content of low-carbon hydrocarbons in oilfield waste is high, microwave pyrolysis treatment with lower power and shorter time can be used. When high-carbon hydrocarbon content is higher, microwave power pyrolysis with higher power and longer time can be used. deal with. In the microwave pyrolysis treatment, it is preferred to control the oxygen content to less than 7% to prevent the petroleum waste from generating a flammable or explosive gas to cause fire or explosion. The manner of controlling the oxygen content is preferably such that the tail gas generated by the steam boiler or the heat transfer oil boiler is used as an inert gas in the microwave pyrolysis treatment. After the solid treatment is obtained, it is preferable to further spray or rewet or solidify the solid treatment to reduce the discharge temperature, prevent burns and dust pollution, and simplify the subsequent treatment process. The gas obtained by the microwave pyrolysis treatment is subjected to condensation separation and purification treatment to recover water and oil; and the recovered oil is used for steam heating or heat conduction oil heating.

 The invention also discloses an industrial processing device for oil field waste, comprising:

 Feed hopper, dryer, microwave heating chamber, microwave generator, heating device and condensation separation and purification device;

 The feed hopper is connected to the feed end of the dryer;

 a discharge end of the dryer is connected to a feeding end of the microwave heating chamber;

 The heating device is a steam boiler or a heat transfer oil boiler, and a steam outlet or a heat transfer oil outlet of the heating device is connected to a steam inlet or a heat transfer oil inlet of the dryer;

 The gas outlet of the dryer and the gas outlet of the microwave heating chamber are connected to the condensation separation purification device;

 The microwave generator is coupled to a microwave heating chamber.

 In the present invention, the dryer is a device in which oil field waste is preheated to obtain a pretreated solid product and a gas. The type of the dryer of the present invention is not particularly limited, and is preferably a paddle dryer.

 The feed hopper is an inlet for oil field waste, and the feed hopper is connected to a feed end of the dryer. The feed hopper and the feed end of the dryer are preferably connected by an airlock connection or a feed device, which is a feed screw and a rotary unloading device that are sequentially connected.

The heating device is a steam boiler or a heat transfer oil boiler, which provides a high temperature heat medium for the dryer. Said The steam outlet or the heat transfer oil outlet of the heating device is connected to the steam inlet or the heat transfer oil inlet of the dryer. The heating device generates high-temperature steam or heat-conducting oil, and is input to a steam inlet or a heat-conducting oil inlet in the dryer through a steam outlet or a heat-conducting oil outlet to preheat the oil field waste. The heating device simultaneously generates exhaust gas, that is, a gas such as carbon dioxide. Preferably, the exhaust gas outlet of the heating device is connected to the inert gas inlet of the dryer, and the generated exhaust gas is input into the dryer to control the oxygen content in the dryer. Preferably, the exhaust gas outlet of the heating device is connected to the inert gas inlet of the microwave heating chamber, and the generated exhaust gas is input into the microwave heating chamber to control the oxygen content in the microwave heating chamber.

 The microwave heating chamber is a device for subjecting the pretreated solid product to microwave pyrolysis treatment. The pretreated solid product is preferably conveyed in the microwave heating chamber by means of a conveyor, preferably a conveyor belt, a paddle conveyor, a screw conveyor or a scraper conveyor. The microwave generator is a device that generates microwaves that convert electrical energy into energy of an electromagnetic field. The microwave generator can be one or more. The microwave generator is connected to the microwave heating chamber through the wave guiding device, and the electromagnetic wave is transmitted into the microwave heating chamber, and the pretreated solid product is subjected to microwave pyrolysis treatment, so that the remaining water and hydrocarbons therein are converted into gas, and the solid remains. Treatment. The discharge end of the dryer is preferably connected to the feed end of the microwave heating chamber by means of an air lock or a rotary unloading device. The discharge end of the microwave heating chamber is preferably connected to the discharge screw by means of an air lock or a rotary unloading device.

 In order to improve energy utilization, it is preferable to provide a first circulating water jacket outside the discharging spiral casing, and a second circulating water jacket disposed outside the feeding spiral casing, the first circulating water jacket passing through The cold water pipe and the hot water pipe are connected to the second circulating water jacket. The water in the first circulating water jacket absorbs the heat of the solid processing material discharged from the microwave heating chamber, the temperature rises, and is sent to the second circulating water jacket through the hot water pipeline, and is used for the auxiliary pretreatment of the oil field waste. heat. The water released from the second circulating water jacket is then sent back to the first circulating water jacket through the cold water pipe to complete the heat recycling.

 The function of the condensing separation purification device is to condense, vapor-liquid, and purify the gas. The gas outlet of the dryer and the gas outlet of the microwave heating chamber are connected to a condensing separation purification device. The condensing separation and purification device preferably includes a dust remover, a condenser, a fan, an exhaust gas purifying device, a gravity sink, and a water-oil separator;

The connection sequence is that the dust collector is connected to the condenser, and the gas outlet of the condenser is connected to the exhaust gas purifying device through the fan; the liquid outlet of the condenser is connected with the gravity settler, and the water outlet of the gravity settler is connected with the oil water separator. Alternatively, the position of the fan can be appropriately adjusted according to the common knowledge of those skilled in the art. The condensing separation and purification device further preferably includes a dust remover, a fan, a condenser, an exhaust gas purifying device, a gravity settler, and a water-oil separator;

 The connection order is that the outlet of the precipitator is connected to the condenser through a fan, and the gas outlet of the condenser is connected with the exhaust gas purifying device; the liquid outlet of the condenser is connected with the gravity settler, and the outlet of the gravity settler is connected with the oil-water separator. The present invention is not particularly limited to the type of the dust remover, and is preferably a bag filter or a cyclone dust remover. The condenser is preferably one or more. The oil-water separator is preferably one or more. The exhaust gas purifying device is preferably a water washing device, an activated carbon filter or a UV high efficiency gas purifier.

 In order to further understand the present invention, the industrial treatment method and apparatus for oil field waste provided by the present invention will be described below with reference to the embodiments, and the scope of protection of the present invention is not limited by the following examples.

 Example 1

 The industrial treatment device and process flow of the oil field waste provided in the embodiment 1 are as shown in FIG. In Fig. 1, the feed hopper (1) is connected to the dryer (3) through the air lock (2), and the steam outlet of the steam boiler (6) is connected to the steam inlet of the dryer (3).

 The discharge end of the dryer (3) is connected to the feed end of the microwave heating chamber (4) through an air lock (2-1), and the microwave generator (7) is connected to the microwave heating chamber (4) via a wave guiding device. A paddle conveyor (5) is provided in the microwave heating chamber (4).

 The gas outlets of the dryer (3) and the microwave heating chamber (4) are connected to the dust remover (12), and the dust remover (12) is sequentially connected to the condenser (13) and the condenser (13-1), and the condenser (13) The gas outlet of -1 ) is connected to the UV high efficiency gas purifier ( 15 ) via a fan ( 14 ). The liquid outlets of the condenser (13) and the condenser (13-1) are connected to a gravity settler (16), and the outlet of the gravity settler (16) is connected to the water separator (17).

 The discharge end of the microwave heating chamber (4) is connected to the discharge screw (8) through the air lock (2-2), and the spray device (9) is arranged in the discharge screw (8). A discharge bin (10) is arranged below the end of the discharge screw (8).

 The exhaust gas outlets of the steam boiler (6) are connected to the inert gas inlets of the dryer (3) and the microwave heating chamber (4), respectively.

 The oxygen content detecting device (12) is connected to the dryer (3) and the microwave heating chamber (4), respectively.

The oil field waste enters the dryer (3) through the feed hopper (1) through the air lock (2), using the steam boiler (6) The generated high temperature steam preheats the oil field waste to obtain water vapor, oil and gas and pretreated solid products. The pretreated solid product is subjected to microwave pyrolysis treatment through air lock (2-1) into the microwave heating chamber (4) to obtain water vapor, oil and gas and microwave pyrolysis solid products. The water vapor and oil and gas generated in the dryer and the microwave heating chamber are extracted by the fan (14), dedusted by the dust remover (12), and condensed at the condenser (13) and the condenser (13-1) to obtain non-condensation. The gas is discharged to the atmosphere through a fan (14) and a UV-efficient gas purifier (15); the condensed liquid is separated from the oil-water separator (17) by a gravity settler (16).

 The solid product subjected to the microwave pyrolysis treatment passes through the air lock (2-2) to the downstream discharge spiral (8), and the discharge is gradually performed. At the same time, the solid product is sprayed and then wetted using a spraying device (9), and the final treated product falls into the unloading bin (10) for storage and transportation.

 Example 2

 The industrial treatment device and process flow of the oil field waste provided in Embodiment 2 are as shown in FIG. 2 . In Fig. 2, the feed hopper (1) is connected to the dryer (4) through the feed screw (2) and the rotary unloading device (3), the steam outlet of the steam boiler (7) and the steam inlet of the dryer (4). connection. The discharge end of the dryer (4) is connected to the feeding end of the microwave heating chamber (5) through a rotary unloading device (3-1), and the microwave generator (8) is connected to the microwave heating chamber (5) through the waveguide device. . A conveyor belt (6) is arranged in the microwave heating chamber (5).

 The gas outlets of the dryer (4) and the microwave heating chamber (5) are respectively connected to the dust collector (13), the fan (14) and the condenser (15) and the condenser (15-1), respectively, and the condenser (15) The gas outlet of 1) is connected to a UV high efficiency gas purifier (16). The liquid outlet of the condenser (15) and the condenser (15-1) is connected to a gravity settler (17), and the outlet of the gravity settler (17) is connected to the water separator (18). The discharge end of the microwave heating chamber (5) is connected to the discharge screw (9) by means of a rotary unloading device (3-2). A sprinkler (10) is arranged in the discharge screw (9), and a discharge bin (11) is arranged below the end of the discharge screw (9).

 The exhaust gas outlets of the steam boiler (7) are connected to the dryer (4) and the inert gas inlet of the microwave heating chamber (5), respectively.

 The oxygen content detecting device (12) is connected to the dryer (4) and the microwave heating chamber (5), respectively.

The oil field waste enters the dryer (4) through the feed hopper (1), the feed screw (2) and the rotary unloading device (3), and is preheated by the high temperature steam generated by the steam boiler (7) to obtain water vapor. Oil and gas And pre-treating the solid product. The pretreated solid product is subjected to microwave pyrolysis treatment through a rotary unloading device (3-1) into the microwave heating chamber (5) to obtain a water vapor, oil and gas and microwave pyrolysis solid product. The water vapor and oil and gas generated in the dryer and the microwave heating chamber are extracted by the fan (14), dedusted by the dust collector (13), and condensed at the condenser (15) and the condenser (15-1) to obtain non-condensation. The gas is discharged to the atmosphere through a UV high efficiency gas purifier (16); the condensed liquid is separated by oil and water through a gravity settler (17) and a water separator (18).

 The solid product subjected to the microwave pyrolysis treatment is passed through a rotary unloading device (3-2) to a downstream discharge spiral (9), and the discharge is gradually performed. At the same time, the solid product is sprayed and then wetted using a spraying device (10), and the final treated product falls into the unloading bin (11) for storage and transportation.

 Example 3

 The industrial treatment device and process flow of the oil field waste provided in Embodiment 3 are as shown in FIG. In Fig. 3, the feed hopper (1) is connected to the dryer (3) through the air lock (2), and the heat transfer oil outlet of the heat transfer oil boiler (6) is connected to the heat transfer oil inlet of the dryer (3).

 The discharge end of the dryer (3) is connected to the feed end of the microwave heating chamber (4) via an air lock (2-1), and the microwave generator (7) is connected to the microwave heating chamber (4) via a wave guiding device. A scraper conveyor (5) is arranged in the microwave heating chamber (4).

 The gas outlets of the dryer (3) and the microwave heating chamber (4) are respectively connected to the dust remover (12), the condenser (13) and the condenser (13-1), respectively, and the gas outlet of the condenser (13-1) Connected to the activated carbon filter ( 15 ) via the fan ( 14 ). The liquid outlet of the condenser (13) and the condenser (13-1) is connected to the gravity settler (16), and the water outlet of the gravity settler (16) is connected to the water separator (17).

 The discharge end of the microwave heating chamber (4) is connected to the discharge screw (8) through the air lock (2-2), and the discharge screw (8) is provided with a spray device (9), and the discharge spiral (8) A discharge bin (10) is arranged below the end.

 The exhaust gas outlet of the heat transfer oil boiler (6) is connected to the dryer (3) and the inert gas inlet of the microwave heating chamber (4).

 The oxygen content detecting device (12) is connected to the dryer (3) and the microwave heating chamber (4), respectively.

The oil field waste enters the dryer (3) through the air hopper (2) through the air lock (2), and heats the oil field waste by using the high temperature heat transfer oil generated by the heat transfer oil boiler (6) to obtain water vapor, oil and gas and pretreatment. Solid product. The pretreated solid product is subjected to microwave pyrolysis treatment through air lock (2-1) into the microwave heating chamber (4). The water vapor and oil and gas generated in the dryer and the microwave heating chamber are extracted by the fan (14). After the dust collector (12) is dedusted, it is condensed at the condenser (13) and the condenser (13-1), and the obtained non-condensable gas is discharged to the atmosphere through the activated carbon filter (15); the liquid obtained by condensation passes through gravity The settler (16) is separated from the oil-water separator (17) by oil-water separation. The separated oil can be reused as a fuel for the heat transfer oil boiler (6).

 The solid product subjected to the microwave pyrolysis treatment passes through the air lock (2-2) to the downstream discharge spiral (8), and the discharge is gradually performed. At the same time, the solid product is sprayed and then wetted using a spraying device (9), and the final treated product falls into the unloading bin (10) for storage and transportation.

 Example 4

 The industrial treatment device and process flow of the oil field waste provided in the embodiment 4 are as shown in FIG. In Figure 4, the feed hopper (1) passes through the feed screw (2) and the rotary unloading device (3) with the dryer

(4) Connection, steam outlet of steam boiler (7) is connected to steam inlet of dryer (4). The discharge end of the dryer (4) is connected to the feeding end of the microwave heating chamber (5) through a rotary unloading device (3-1), and the microwave generator (8) is connected to the microwave heating chamber (5) through the waveguide device. . A paddle conveyor (6) is provided in the microwave heating chamber (5).

 The gas outlets of the dryer (4) and the microwave heating chamber (5) are respectively connected to the dust collector (13), and the outlet of the dust collector (13) passes through the fan (14) and the condenser (15) and the condenser (15-1). Connect, the gas outlet of the condenser ( 15-1) is connected to the activated carbon filter ( 16 ). The liquid outlet of the condenser (15) and condenser (5-11) is connected to a gravity settler (17), and the water outlet of the gravity settler (17) is connected to the oil water separator (18).

 The discharge end of the microwave heating chamber (5) is connected to the discharge screw (9) through a rotary unloading device (3-2), and a discharge device (10) is arranged in the discharge screw (9), and a discharge spiral (9) There is a discharge bin (11) below the end of the).

 The exhaust gas outlets of the steam boiler (7) are connected to the dryer (4) and the inert gas inlet of the microwave heating chamber (5), respectively.

 The oxygen content detecting device (12) is connected to the dryer (4) and the microwave heating chamber (5), respectively.

 A first circulating water jacket (20a) is disposed outside the casing of the discharging screw (9), and a second circulating water jacket (20b) is disposed outside the casing of the feeding screw (2) through the hot water pipe (19a) ) Connected to the cold water line ( 19b).

The oil field waste enters the dryer (3) through the feed hopper (1) and the air lock (2), using the steam boiler (6) The resulting high temperature steam heats the oil field waste to obtain water vapor, oil and gas, and pretreated solid products. The pretreated solid product is subjected to microwave pyrolysis treatment through air lock (2-1) into the microwave heating chamber (4). The water vapor and oil and gas generated in the dryer and the microwave heating chamber are extracted by the fan (14), dedusted by the dust collector (12), and condensed at the condenser (15) and the condenser (15-1) to obtain non-condensation. The gas is discharged to the atmosphere through an activated carbon filter (16); the condensed liquid is separated from the oil and water by a gravity settler (17) and a water separator (18).

 The solid product subjected to the microwave pyrolysis treatment passes through the air lock (2-2) to the downstream discharge spiral (9), and the discharge is gradually performed. At the same time, the solid product is sprayed and wetted using the spraying device (10), and the final treated product falls into the unloading bin (11) for storage and transportation.

 A first circulating water jacket (20a) is disposed outside the casing of the discharge screw (9), and a second circulating water jacket (20b) is disposed outside the casing of the feeding screw (2). The circulating water in the first circulating water jacket (20a) absorbs heat in the solid product discharged from the microwave heating chamber, and the temperature rises, and is sent to the second circulating water jacket (20b) via the hot water pipe (19a). Hot initial material. The circulating water that releases heat and lowers the temperature is returned to the first circulating water jacket (20a) by the cold water pipe (1%) to complete the heat recycling.

 Example 5

 The industrial treatment of petroleum waste was carried out using the treatment apparatus described in Example 1.

 1000kg of drilling cuttings (water content 19%, oil content 7%) are fed into the paddle dryer by air lock from the feed hopper, using the high temperature steam generated by the steam boiler (steam temperature is 160 ° C, pressure is

0.6MPa, flow rate 120kg / hr) preheating materials, preliminary removal of volatile components, the vaporized gas is pumped out by a high-pressure fan, the pressure in the chamber is -170-200Pa, and the oxygen content is about 7%. For 1 hour, the material outlet temperature is 90 °C:. The preheated and dried cuttings enter the microwave heating chamber through the air lock and reach the feeding end of the blade conveyor. During this process, the temperature drops to 60 ° C, and the speed of the central shaft is adjusted to 1 rpm. The two microwave generators output a total of 130kw of microwaves, which are transmitted to the microwave heating chamber through the waveguide device to heat the materials, so that the water and hydrocarbons contained therein are evaporated and separated from the materials, and are quickly taken out of the cavity by the high-pressure fan. The internal pressure is -170-200Pa, and the oxygen content is about 4%-7%. The process lasts for 60 minutes and the material outlet temperature is 267 °C. The solid phase residue that completes the thermal desorption is lost When it is sent to the discharge end of the heating chamber, it reaches the downstream discharge screw through the air lock, and gradually discharges the material, and finally the material falls into the discharge bin for storage and transportation. In the process, boiler exhaust gas (mainly carbon dioxide) is used to charge the dryer and the microwave heating chamber to control its oxygen content. The gas generated during the drying and thermal desorption process is extracted by a high-pressure fan, and the dust is removed by a dust remover, and then condensed by a condenser, and the obtained liquid-phase oil-water mixture flows into the gravity settler and the oil-water separator, and is separated. The oil and water are recovered, and the non-condensable gas is treated by a UV-efficient gas purifier and discharged to the atmosphere. The solid phase residue obtained in the above process was sampled and tested by three sample points, and the results were as follows (mass percentage):

 Example 6

 The industrial treatment of petroleum waste was carried out using the treatment apparatus described in Example 1. 1000kg drilling cuttings (water content 19%, oil content 7%) are fed into the paddle dryer by air lock from the feed hopper, using high temperature steam generated by steam boiler (steam temperature is 160 °C, pressure is 0.6) MPa, flow rate 120kg / hr) preheating materials, preliminary removal of volatile components, the vaporized gas is extracted by a high-pressure fan, the pressure in the chamber is -170-200Pa, the oxygen content is about 7%, this process continues At 1 hour, the material outlet temperature was 92 °C.

The preheated and dried cuttings enter the microwave heating chamber through the air lock and reach the feeding end of the blade conveyor. During this process, the temperature drops to 63 °C, and the speed of the central shaft is adjusted to 1 rpm. The two microwave generators output a total of llOkw microwaves, which are transmitted to the microwave heating chamber through the waveguide device to heat the materials. The water and hydrocarbons contained therein are evaporated and separated from the material, and are taken out of the chamber by a high-pressure blower in time. The pressure in the chamber is -170-200Pa, and the oxygen content is about 7%. The process lasts for 60 minutes and the material outlet temperature is 222. °C. When the solid phase residue that completes the thermal desorption is transported to the discharge end of the heating chamber, it passes through the air lock to reach the downstream discharge spiral, and gradually discharges, and finally the material falls into the discharge bin for storage and transportation.

 In the process, boiler exhaust gas (mainly carbon dioxide) is used to charge the dryer and microwave heating chamber to control its oxygen content. The gas generated during the drying and thermal desorption process is extracted by a high-pressure fan, and the dust is removed by a dust remover, and then condensed by a condenser, and the obtained liquid-phase oil-water mixture flows into the gravity settler and the oil-water separator, and is separated. The oil and water are recovered, and the non-condensable gas is treated by a UV-efficient gas purifier and discharged to the atmosphere. The solid phase residue obtained in the above process was selected and sampled by three sample points, and the results were as follows (mass percentage):

Example 7 The industrial treatment of petroleum waste was carried out using the treatment apparatus described in Example 1. 1000kg drilling cuttings (water content 17%, oil content 7%) are fed into the paddle dryer by gas lock from the feed hopper, using high temperature steam generated by steam boiler (steam temperature is 160 °C, pressure is 0.6) MPa, flow rate 120kg / hr) preheating materials, preliminary removal of volatile components, the vaporized gas is extracted by a high-pressure fan, the pressure in the chamber is -170-200Pa, the oxygen content is about 7%, this process continues At 1 hour, the material outlet temperature was 90 °C. The preheated and dried cuttings enter the microwave heating chamber through the air lock and reach the feeding end of the blade conveyor. During this process, the temperature drops to 62 °C, and the speed of the central axis is adjusted to 1 rpm. The two microwave generators output a total of 120kw of microwaves, which are transmitted to the microwave heating chamber through the waveguide device, and heat the materials to evaporate and remove the water and hydrocarbons, and are quickly extracted by the high-pressure fan. The internal pressure is -170-200Pa, and the oxygen content is about 7%. The process lasts for 60 minutes and the material outlet temperature is 245 °C. When the solid phase residue that completes the thermal desorption is transported to the discharge end of the heating chamber, it passes through the air lock to reach the downstream discharge spiral, and gradually discharges, and finally the material falls into the discharge bin for storage and transportation. In the process, boiler exhaust gas (mainly carbon dioxide) is used to charge the dryer and the microwave heating chamber to control its oxygen content. The gas generated during the drying and thermal desorption process is extracted by a high-pressure fan, and the dust is removed by a dust remover, and then condensed by a condenser, and the obtained liquid-phase oil-water mixture flows into the gravity settler and the oil-water separator, and is separated. The oil and water are recovered, and the non-condensable gas is treated by a UV-efficient gas purifier and discharged to the atmosphere. The solid phase residue obtained in the above process was sampled and tested by three sample points, and the results were as follows (mass percentage):

The above description of the embodiments is only to assist in understanding the method of the present invention and its core idea. It should be noted that those skilled in the art can make several modifications and changes to the present invention without departing from the principles of the present invention. These modifications and modifications also fall within the scope of the present invention. Within the scope of protection.

 The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments are obvious to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded to the broadest scope of the principles and novel features disclosed herein.

Claims

Rights request 1. The industrial treatment method of oil field waste includes the following steps: (A) After sampling and analyzing the oil field waste, use steam heating or thermal oil heating to preheat the oil field waste to 80~300 °C to obtain pretreated solid products and gases, which are condensed, separated and purified. , water, oil and non-condensable gas are recovered, and the recovered oil and non-condensable gas are used as fuel for steam heating or thermal oil heating; (B) The pretreatment solid product is subjected to microwave pyrolysis treatment, and the pressure is controlled to -5000-100 Pa, to obtain a solid treatment product and gas with a total petroleum hydrocarbon content of less than 3%; the gas is subjected to condensation separation and purification treatment, Water and oil are recovered, and the recovered oil is used as fuel for steam heating or thermal oil heating. 2. The processing method according to claim 1, characterized in that in the step (A), the oxygen content is controlled to be less than 7% during the preheating. 3. The processing method according to claim 1, characterized in that the step (B) further includes spraying, rewetting or solidifying the solid treatment object. 4. The treatment method according to claim 1, characterized in that in the step (B), the oxygen content is controlled to be less than 7% during the microwave pyrolysis treatment. 5. Industrial treatment equipment for oil field waste, including: Feed hopper, dryer, microwave heating chamber, microwave generator, heating device and condensation separation and purification device; The feed hopper is connected to the feed end of the dryer; The discharge end of the dryer is connected to the feed end of the microwave heating cavity; The heating device is a steam boiler or a thermal oil boiler, and the steam outlet or thermal oil outlet of the heating device is connected to the steam inlet or thermal oil inlet of the dryer; The gas outlet of the dryer and the gas outlet of the microwave heating cavity are both connected to the condensation separation and purification device; The microwave generator is connected to the microwave heating cavity. 6. The device according to claim 5, further comprising an air lock or a feeding device; the feeding device is a feeding spiral and a rotating unloading device connected in sequence, and the feeding hopper and the dryer The feed ends are connected through an air lock connection or a feeding device. 7. The device according to claim 6, further comprising a discharging spiral, and the discharging spiral is connected to the discharging end of the microwave heating cavity. 8. The device according to any one of claims 6 to 7, characterized in that a first circulating water jacket is provided outside the discharge spiral housing, and a second circulating water jacket is provided outside the feeding spiral housing. The first circulating water jacket and the second circulating water jacket are connected through a cold water pipeline and a hot water pipeline. 9. The device according to any one of claims 5 to 8, characterized in that the condensation separation and purification device includes a dust collector, a condenser, a fan, an exhaust gas purification device, a gravity settler, and an oil-water separator; The connection sequence is that the dust collector is connected to the condenser, the gas outlet of the condenser is connected to the exhaust gas purification device through the fan; the liquid outlet of the condenser is connected to the gravity settler; the water outlet of the gravity settler is connected to the oil-water separator. 10. The device according to any one of claims 5 to 8, characterized in that the tail gas outlet of the heating device is connected to the inert gas inlet of the dryer or the microwave heating chamber. -μ