CN110240369B - Pyrolysis-extraction circulating recycling treatment process method for polymer-containing oil sludge - Google Patents
Pyrolysis-extraction circulating recycling treatment process method for polymer-containing oil sludge Download PDFInfo
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- CN110240369B CN110240369B CN201910490781.XA CN201910490781A CN110240369B CN 110240369 B CN110240369 B CN 110240369B CN 201910490781 A CN201910490781 A CN 201910490781A CN 110240369 B CN110240369 B CN 110240369B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/147—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using organic substances
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
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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
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/40—Valorisation of by-products of wastewater, sewage or sludge processing
Abstract
The invention relates to a pyrolysis-extraction circulation recycling treatment process method of polymer-containing oil sludge, which comprises the following steps: the method comprises the steps of taking pyrolysis oil obtained by pyrolysis reaction as an extractant and taking the pyrolysis oil as an extractant, fully stirring and mixing the pyrolysis oil in an extraction reactor, extracting the mixture, and then performing flocculation three-phase separation, wherein gas phase obtained by pyrolysis reaction of a solid residue item pyrolysis reactor enters a three-phase separator for separation through primary and secondary heat exchange and condenser condensation to obtain pyrolysis oil, the pyrolysis oil is heated through heat exchange and then circulates back to the extraction reactor to be used as the extractant, and noncondensable gas obtained by separation enters a gas dissolving tank of a sewage treatment system after being treated and collected to provide coalesced gas for the sewage treatment system. The treatment process method disclosed by the invention not only can fully recover the crude oil resource in the polymer-containing oil sludge, but also can realize cyclic utilization of heat, pyrolysis oil and non-condensable gas in the pyrolysis process, and realizes volume reduction, recycling and harmless treatment of the polymer-containing oil sludge.
Description
The technical field is as follows:
the invention belongs to the field of solid waste treatment, and particularly relates to a pyrolysis-extraction cyclic recycling treatment process method for polymer-containing oil sludge.
Background art:
due to the large-scale application of the polymer flooding, residual polyacrylamide (HPAM) in the polymer-containing oil sludge interacts with the water treatment agent and the solid particles to coat crude oil and water, so that the polymer-containing oil sludge with stable properties is formed. The polymer flooding oil field and the crude oil storage tank bottom mud of the polymer flooding crude oil refinery and the scum bottom mud of the water treatment system generate a large amount of polymer-containing oil sludge, the performance of the polymer-containing oil sludge is different from that of common 'refined three-mud', and the treatment difficulty is high.
In the treatment process of the polymer-containing produced liquid, the added coagulant, flocculant and other water purifying agents can remove oil and suspended matters, but the polymer-containing oil sludge with extremely stable properties is brought along with the water purifying agents. Due to the existence of the anionic polymer, the stability of the polymer flooding produced liquid is improved, the dosage of a common coagulant and a flocculant can be doubled in the sewage purification process, and a large amount of polymer-containing oil sludge with high viscosity and poor fluidity is generated. The polymer-containing oil sludge has stable performance, high oil-water content and low solid content, and can be recycled as a resource to recover precious crude oil resources. Due to the existence of the polymer, the polymer-containing oil sludge is difficult to dehydrate, the water content is 80-90% after chemical modulation-centrifugal separation, and the energy consumption of the whole pyrolysis treatment is too high.
The invention content is as follows:
the invention aims to solve the problems of stable emulsion containing polymer sludge, high difficulty in dehydration and crude oil recovery through a pyrolysis-extraction cyclic recycling treatment process of the polymer sludge, fully recover crude oil resources in the polymer sludge, realize cyclic utilization of heat, pyrolysis oil and non-condensable gas in the pyrolysis process, and realize volume reduction, recycling and harmless treatment of the polymer sludge.
The invention provides a pyrolysis-extraction circulating resource treatment process method of polymer-containing oil sludge, which comprises the following steps:
(1) the polymer-containing oil sludge is conveyed into an extraction reactor through a diaphragm pump, a crude oil demulsifier is injected on a pipeline, the polymer-containing oil sludge is fully stirred and mixed with pyrolysis oil at 100-120 ℃ and liquid coming from a sewage system in the extraction reactor, after extraction is carried out for 40-60min, the mixture is conveyed into a three-phase centrifuge for three-phase separation after passing through a screw pump and being injected with a flocculant A, an oil phase enters a crude oil buffer tank for sedimentation, crude oil with the water content of below 0.5 percent flows into a crude oil storage tank, and sewage obtained by sedimentation enters a sewage buffer tank; the water-phase sewage flows into a sewage buffer tank, and the solid slag phase is sent into a drying reactor by a spiral conveyor; the weight ratio of the oil content of the pyrolysis oil to the oil content of the polymer-containing oil sludge is 1:1-1: 5;
(2) the water content of polymer-containing oil sludge is reduced to 30% by a solid slag phase through a drying reactor under the action of 100-plus-150 ℃ heat medium oil, then the dried solid slag phase is conveyed to a pyrolysis reactor and pyrolyzed at the temperature of 550-plus-650 ℃ in a nitrogen reducing atmosphere, 550-plus-650 ℃ water vapor and pyrolysis gas generated by pyrolysis are cooled to 300 ℃ by a primary heat exchanger, then cooled to 200-plus-180 ℃ with circulating pyrolysis oil in a secondary heat exchanger, finally cooled to 50-60 ℃ by a condenser and then enter a three-phase separator for separation to obtain three phases of non-condensable gas, pyrolysis oil and sewage, the non-condensable gas enters a non-condensable gas treatment system, the pyrolysis oil is heated by the secondary heat exchanger and then returns to an extraction reactor, and the sewage enters a sewage treatment system; carrying out external landfill or curing on the pyrolysis residues; (3) the non-condensable gas entering the non-condensable gas processing system is subjected to dust removal and denitration by a bag type dust remover and a cyclone separator, is pressurized by a non-condensable gas compressor and then enters a non-condensable gas storage tank, part of the non-condensable gas in the storage tank is dissolved in a dissolved gas tank, the pressure of the dissolved gas tank is controlled to be 0.2-0.6MPa, and part of the non-condensable gas enters a torch system;
and the non-condensable gas passes through the non-condensable gas treatment system and enters a dissolved air tank of the coalescence air floatation device together with the backflow water of the coalescence air floatation device.
(4) After sewage from a three-phase centrifuge, a crude oil buffer tank and a three-phase separator enters a sewage buffer tank, the sewage is firstly pumped to a coalescence air floatation device by a sewage lifting pump, the sewage is coalesced and air-floated to remove oil to obtain the sewage with the oil content reduced to be within 30mg/L, scum generated in the coalescence air floatation device is collected and then pumped to an extraction reactor by a coalescence air floatation scum lifting pump, gas phase generated by the coalescence air floatation device enters a low-pressure torch system, and return water of the coalescence air floatation device enters a dissolved air tank and is fully mixed with non-condensable gas from a non-condensable gas storage tank and then returns to the coalescence air floatation device to be released at the bottom of a coalescence air floatation area; and (3) the sewage after oil removal enters a ceramic membrane filter for further oil removal to obtain reclaimed water and concentrated solution with the oil content of less than 5mg/L, wherein the reclaimed water enters a reclaimed water buffer tank to be used as reclaimed water for reuse, and the concentrated solution and backwashing water of the ceramic membrane filter are pumped into an extraction reactor for retreatment.
In the pyrolysis-extraction circulating resource treatment process method of the polymer-containing oil sludge, the crude oil demulsifier is preferably a polyether demulsifier, and the mass concentration of the polyether demulsifier is 0.5-2%.
More preferably, the flocculant A is preferably a polyacrylamide flocculant.
Preferably, the crude oil buffer tank is a horizontal oil-water separator, and is internally provided with a baffle plate, a settling chamber, an oil chamber and a water chamber.
More preferably, the three-phase centrifuge is a horizontal screw type three-phase high-speed centrifuge, and the rotating speed is 3000 and 4000 r/min.
Preferably, the polymer-containing sludge solid phase is added with dehydrated biochemical sludge before entering the drying reactor, and the addition amount is 0-15% of the weight of the polymer-containing sludge solid phase.
Preferably, a flocculating agent B is added at the inlet of the coalescence air flotation device, and the flocculating agent B is one or a compound product of polyaluminium chloride, polyferric chloride and polydimethyldiallylammonium chloride.
The invention further provides a treatment system for realizing pyrolysis-extraction circulating resource treatment of polymer-containing oil sludge, which comprises an extraction separation system, a pyrolysis reaction system and a sewage treatment system, wherein the extraction separation system comprises an extraction reactor, a screw pump, a three-phase centrifuge, a crude oil lift pump and a crude oil buffer tank which are sequentially connected; the pyrolytic reaction system including the mummification reactor, pyrolytic reaction ware and the condenser that connect gradually, sewage treatment system including consecutive sewage buffer tank, sewage elevator pump, coalescence air supporting device, ceramic membrane filter entry elevator pump, ceramic membrane filter, normal water buffer tank, wherein:
the system also comprises a noncondensable gas treatment system, the pyrolysis reaction system also comprises a primary heat exchanger, a secondary heat exchanger and a three-phase separator, a gas phase outlet of the pyrolysis reactor is sequentially connected with the primary heat exchanger, the secondary heat exchanger, a condenser and the three-phase separator, a pyrolysis oil outlet of the three-phase separator is connected with the secondary heat exchanger through a pyrolysis oil lifting pump, and an outlet of the secondary heat exchanger is connected with an inlet of the extraction reactor, so that pyrolysis oil returns to the extraction reactor after heat exchange; the non-condensable gas outlet of the three-phase separator is connected with the non-condensable gas processing system, the non-condensable gas processing system comprises a bag type dust collector, a cyclone separator, a non-condensable gas compressor and a non-condensable gas buffer tank which are sequentially connected, and the bag type dust collector is connected with the non-condensable gas outlet of the three-phase separator; the sewage outlet of three-phase separator with sewage treatment system connect, sewage treatment system still including dissolving the gas pitcher, dissolve the gas pitcher and be equipped with gas inlet, liquid inlet and dissolve the gas export, wherein gas inlet connects noncondensable gas buffer tank, makes the partial noncondensable gas get into and dissolves the gas pitcher, the liquid inlet is connected with the backward flow water pipe of coalescence air supporting device, dissolves the gas export of dissolving the gas pitcher and dissolves the gas entry linkage with coalescence air supporting device to the water of dissolving that obtains with the thorough mixing of noncondensable gas of backward flow water flows back to coalescence air supporting device.
Compared with the prior art, the pyrolysis-extraction circulation resource treatment process method for polymer-containing oil sludge has the advantages that pyrolysis products (pyrolysis oil and non-condensable gas) are fully utilized, the pyrolysis oil is used for extracting a part of crude oil in the polymer-containing oil sludge, the oil content of the crude oil is reduced, the part which is difficult to extract is subjected to pyrolysis treatment, the pyrolysis heat is used for drying the polymer-containing oil sludge to reduce the water content of the polymer-containing oil sludge, and the efficiency in a pyrolysis reactor is highest; the noncondensable gas generated by pyrolysis is used as an aeration gas source of the coalescence air flotation device, and the energy circulation rate and the resource recovery rate of the whole process are highest, so that the minimization, the recycling and the harmlessness of the polymer-containing oil sludge are realized.
Drawings
Fig. 1 is a schematic view of a pyrolysis-extraction circulation recycling treatment process system for polymer-containing oil sludge.
In the figure, 1-an extraction reactor, 2-a screw pump, 3-a three-phase centrifuge, 4-a screw conveyor, 5-a crude oil lifting pump, 6-a crude oil buffer tank, 7-a drying reactor, 8-a pyrolysis reactor, 9-a primary heat exchanger, 10-a secondary heat exchanger, 11-a condenser A, 12-a condenser B, 13-a three-phase separator, 14-a bag type dust remover, 15-a cyclone separator, 16-a non-condensable gas compressor, 17-a non-condensable gas storage tank, 18-a sewage buffer tank, 19-a sewage lifting pump, 20-a coalescence air flotation device, 21-a dissolved air tank, 22-a ceramic membrane filter inlet lifting pump, 23-a ceramic membrane filter, 24-a ceramic membrane filter back-flushing lifting pump and 25-a reclaimed water buffer tank, 26-a coalescence air flotation scum lift pump, 27-a ceramic membrane filter concentrated solution lift pump and 28-a pyrolysis oil lift pump.
Detailed Description
The process and treatment system provided by the present invention will be further described with reference to the drawings, but the present invention is not limited thereto.
Fig. 1 is a schematic view of a pyrolysis-extraction circulation recycling treatment system for polymer-containing oil sludge.
As shown in fig. 1, the pyrolysis-extraction recycling treatment system for polymer-containing oil sludge includes an extraction separation system, a pyrolysis reaction system, a non-condensable gas treatment system, and a sewage treatment system. The extraction separation system comprises an extraction reactor 1, a screw pump 2, a three-phase centrifuge 3, a crude oil lift pump 5 and a crude oil buffer tank 6 which are connected in sequence; the pyrolysis reaction system comprises a drying reactor 7, a pyrolysis reactor 8, a primary heat exchanger 9, a secondary heat exchanger 10, a condenser-A11 and a three-phase separator 13 which are connected in sequence, wherein an inlet of the drying reactor 7 is connected with a three-phase centrifuge 3 of the extraction separation system through a screw conveyor 4, a gas outlet of the drying reactor 7 is connected with a condenser B12, an outlet of the condenser B12 is connected with an outlet pipeline of the condenser A11, polymer-containing oil sludge at an outlet of the drying reactor 7 enters the pyrolysis reactor 8 through the screw conveyor 4, a gas phase outlet of the pyrolysis reactor 8 exchanges heat with pyrolysis oil in the secondary heat exchanger 10 after exchanging heat and condensing with heat medium oil through the primary heat exchanger 9, the pyrolysis gas finally enters the three-phase separator 13 after condensing through the condenser A11, and a pyrolysis oil outlet of the three-phase separator 13 is connected with the secondary heat exchanger 10 through a pyrolysis oil lift pump 28, heating the pyrolysis oil, and connecting the secondary heat exchanger 10 with the inlet of the extraction reactor 1, so that the pyrolysis oil returns to the extraction reactor after heat exchange; the non-condensable gas treatment system comprises a bag type dust collector 14, a cyclone separator 15, a non-condensable gas compressor 16 and a non-condensable gas buffer tank 17 which are connected in sequence, wherein the bag type dust collector 14 is connected with a non-condensable gas outlet of the three-phase separator 13; the sewage treatment system comprises a sewage buffer tank 18, a sewage lifting pump 19, a coalescence air flotation device 20, a ceramic membrane filter inlet lifting pump 22, a ceramic membrane filter 23 and a reclaimed water buffer tank 25 which are sequentially connected, wherein an inlet of the sewage buffer tank 18 is respectively connected with a water phase outlet of the three-phase centrifuge 3, a water chamber outlet of the crude oil buffer tank 6 and a water phase outlet of the three-phase separator 13, the sewage treatment system also comprises a dissolved air tank 21 which is provided with an air inlet, a liquid inlet and a dissolved air outlet, wherein the air inlet is connected with a non-condensable gas buffer tank 17, so that part of non-condensable gas enters the dissolved air tank 21, the liquid inlet is connected with a return water pipe of the coalescence air flotation device 20, the dissolved air outlet of the dissolved air tank is connected with the dissolved air inlet of the coalescence air flotation device 20, and therefore the dissolved air water obtained by fully mixing the backflow water and the non-condensable gas flows back to the coalescence air flotation device 20. The coalescence air-flotation device 20 is also provided with a gas outlet and a scum outlet, wherein the gas outlet is connected with the low-pressure torch system, and the scum outlet is connected with the extraction reactor 1 through a coalescence air-flotation scum lift pump 26; a concentrated solution outlet of the ceramic membrane filter 23 is connected with a concentrated solution lift pump 27 of the ceramic membrane filter, and the concentrated solution of the ceramic membrane filter returns to the extraction reactor 1 through the concentrated solution lift pump 27 of the ceramic membrane filter; the sewage treatment system also preferably comprises a ceramic membrane filter backwashing lift pump 24, and the ceramic membrane filter backwashing lift pump 24 is respectively connected with the ceramic membrane filter 23 and the reclaimed water buffer tank 25, so that membrane cleaning of the ceramic membrane filter 23 is realized.
Starting a diaphragm pump, injecting untreated polymer-containing oil sludge into an extraction reactor 1, adding a demulsifier with the mass concentration of 1.5% (the demulsifier adopted in the embodiment is alkylphenol formaldehyde block polyether), adjusting the stirring speed of a stirrer in the extraction reactor 1 to 120r/min, stirring for 40min, then feeding the mixture into a three-phase centrifuge 3 to perform oil-water-residue three-phase separation, adding a flocculant A (a cationic polyacrylamide flocculant adopted in the embodiment, specifically a copolymer of acrylamide and methacryloyloxyethyl trimethyl ammonium chloride) to 300mg/L, feeding an oil phase into a crude oil buffer tank 6 through a crude oil lifting pump 5 to perform continuous sedimentation separation to obtain crude oil with the water content of below 0.5%, feeding a water phase into a sewage buffer tank 18 through gravity difference, feeding a solid residue phase into a drying reactor through a spiral conveyor to dry and then feeding the crude oil into a pyrolysis reactor 8, the pyrolysis reactor 8 is heated to 600 ℃ through electromagnetic radiation, pyrolysis is carried out for 50min under the nitrogen atmosphere, high-temperature water vapor at 600 ℃ and pyrolysis gas are obtained, the heat medium oil is heated to 120 ℃ in the primary heat exchanger 9, at the moment, the heat medium oil inlet and outlet valves of the drying reactor 7 are opened, and starting the drying reactor 7, cooling the water vapor and the pyrolysis gas to 230 ℃ in the primary heat exchanger 9, then moving the gas to a bypass pipeline of the secondary heat exchanger 10, after the condenser A is condensed to 50 ℃, the condensed oil enters a three-phase separator 13 for oil-water-gas three-phase separation, a secondary heat exchanger 10 is started, pyrolysis oil enters an oil chamber and then enters an extraction reactor 1 after being heated to 100 ℃ by water vapor and pyrolysis gas in the secondary heat exchanger 10 through a pyrolysis oil lifting pump 28, and (3) adjusting the flow of the polymer-containing oil sludge at the inlet, controlling the weight ratio of the polymer-containing oil sludge to the pyrolysis oil to be 5:1, and adjusting the filling amount of the demulsifier to be 0.5%. The reaction temperature in the drying reactor 7 is 150 ℃, and the water vapor and the low boiling point oil gas are cooled to 50 ℃ in a condenser B12 and then enter a three-phase separator 13. And (5) transporting the pyrolysis residues out for landfill or solidification.
The non-condensable gas in the three-phase separator 13 enters a bag-type dust collector 14 through a gas phase outlet for dust removal, then is denitrated through a cyclone separator 15, is compressed to a non-condensable gas buffer tank 17 through a non-condensable gas compressor 16, the flow of the non-condensable gas in the non-condensable gas buffer tank 17 is adjusted to a dissolved gas tank 21 through a valve, and the pressure in the dissolved gas tank 21 is kept to be 0.4 MPa.
Sewage in a water chamber of the three-phase separator 13 overflows into a sewage buffer tank 18, the sewage in the sewage buffer tank 18 is pumped into a coalescence air flotation device 20 through a sewage lifting pump 19 for purification treatment, a flocculating agent B (poly dimethyl diallyl ammonium chloride in the embodiment) is added at an inlet pipeline by 90mg/L, the sewage enters the coalescence air flotation region for further aeration treatment after most of oil content in the sewage is removed through a coalescence region, and the oil content of the sewage at an outlet is controlled to be below 30 mg/L. The clear water outlet of the coalescence air-flotation device 20 enters a ceramic membrane filter 23 through a ceramic membrane filter inlet lifting pump 22, wherein the reflux ratio of the outlet of the coalescence air-flotation device 20 is controlled at 20%, and scum in an oil chamber is pumped to the extraction reactor 1 through a coalescence air-flotation scum lifting pump 26. The non-condensable gas in the coalescing gas flotation device 20 enters a low pressure flare system in the plant area. The water yield of the ceramic membrane is 75 percent, and 25 percent of concentrated solution is pumped to the extraction reactor 1 by a concentrated solution lifting pump 27 of the ceramic membrane filter 23. The clean water of the ceramic membrane filter 23 enters a reclaimed water buffer tank 25 for reuse, when the oil content of the clean water at the outlet of the ceramic membrane filter 23 exceeds 5mg/L, a backwashing lifting pump 24 of the ceramic membrane filter is started to perform backwashing by using the reclaimed water of the reclaimed water buffer tank 23, and backwashing water enters the extraction reactor 1.
The above description is only a few of the preferred embodiments of the present invention, and any person skilled in the art may modify the above-described embodiments or modify them into equivalent ones. Therefore, any simple modifications or equivalent substitutions made in accordance with the technical solution of the present invention are within the scope of the claims of the present invention.
Claims (8)
1. A pyrolysis-extraction circulation resource treatment process method of polymer-containing oil sludge is characterized by comprising the following steps:
(1) the polymer-containing oil sludge is conveyed into an extraction reactor through a diaphragm pump, a crude oil demulsifier is injected on a pipeline, the polymer-containing oil sludge is fully stirred and mixed with pyrolysis oil at 100-120 ℃ and liquid coming from a sewage system in the extraction reactor, after extraction is carried out for 40-60min, the mixture is conveyed into a three-phase centrifuge for three-phase separation after passing through a screw pump and being injected with a flocculant A, an oil phase enters a crude oil buffer tank for sedimentation, crude oil with the water content of below 0.5 percent flows into a crude oil storage tank, and sewage obtained by sedimentation enters a sewage buffer tank; the water-phase sewage flows into a sewage buffer tank, and the solid slag phase is sent into a drying reactor by a spiral conveyor; the weight ratio of the oil content of the pyrolysis oil to the oil content of the polymer-containing oil sludge is 1:1-1: 5;
(2) the water content of polymer-containing oil sludge is reduced to 30% by a solid slag phase through a drying reactor under the action of 100-plus-150 ℃ heat medium oil, then the dried solid slag phase is conveyed to a pyrolysis reactor and pyrolyzed at the temperature of 550-plus-650 ℃ in a nitrogen reducing atmosphere, 550-plus-650 ℃ water vapor and pyrolysis gas generated by pyrolysis are cooled to 300 ℃ by a primary heat exchanger, then cooled to 200-plus-180 ℃ with circulating pyrolysis oil in a secondary heat exchanger, finally cooled to 50-60 ℃ by a condenser and then enter a three-phase separator for separation to obtain three phases of non-condensable gas, pyrolysis oil and sewage, the non-condensable gas enters a non-condensable gas treatment system, the pyrolysis oil is heated by the secondary heat exchanger and then returns to an extraction reactor, and the sewage enters a sewage treatment system; carrying out external landfill or curing on the pyrolysis residues; (3) the non-condensable gas entering the non-condensable gas processing system is subjected to dust removal and denitration by a bag type dust remover and a cyclone separator, is pressurized by a non-condensable gas compressor and then enters a non-condensable gas storage tank, part of the non-condensable gas in the storage tank is dissolved in a dissolved gas tank, the pressure of the dissolved gas tank is controlled to be 0.2-0.6MPa, and part of the non-condensable gas enters a torch system;
the non-condensable gas passes through a non-condensable gas treatment system and then enters a dissolved air tank of the coalescence air floatation device together with the backflow water of the coalescence air floatation device;
(4) after sewage from a three-phase centrifuge, a crude oil buffer tank and a three-phase separator enters a sewage buffer tank, the sewage is firstly pumped to a coalescence air floatation device by a sewage lifting pump, the sewage is coalesced and air-floated to remove oil to obtain the sewage with the oil content reduced to be within 30mg/L, scum generated in the coalescence air floatation device is collected and then pumped to an extraction reactor by a coalescence air floatation scum lifting pump, gas phase generated by the coalescence air floatation device enters a low-pressure torch system, and return water of the coalescence air floatation device enters a dissolved air tank and is fully mixed with non-condensable gas from a non-condensable gas storage tank and then returns to the coalescence air floatation device to be released at the bottom of a coalescence air floatation area; and (3) the sewage after oil removal enters a ceramic membrane filter for further oil removal to obtain reclaimed water and concentrated solution with the oil content of less than 5mg/L, wherein the reclaimed water enters a reclaimed water buffer tank to be used as reclaimed water for reuse, and the concentrated solution and backwashing water of the ceramic membrane filter are pumped into an extraction reactor for retreatment.
2. The pyrolysis-extraction cyclic recycling treatment process method for polymer-containing oil sludge according to claim 1, wherein the crude oil demulsifier is a polyether demulsifier, and the mass concentration of the polyether demulsifier in the polymer-containing oil sludge is 0.5-2%.
3. The pyrolysis-extraction circulation resource treatment process method for polymer-containing oil sludge according to claim 1, wherein the flocculant A is a polyacrylamide flocculant.
4. The pyrolysis-extraction cyclic recycling treatment process method for polymer-containing oil sludge according to claim 1, wherein the crude oil buffer tank is a horizontal oil-water separator, and a baffle plate, a settling chamber, an oil chamber and a water chamber are arranged in the crude oil buffer tank.
5. The pyrolysis-extraction circulation resource treatment process method for polymer-containing oil sludge as claimed in claim 1, wherein the three-phase centrifuge is a horizontal screw type three-phase high-speed centrifuge, and the rotation speed is 3000-4000 r/min.
6. The pyrolysis-extraction circulation resource treatment process method of the polymer-containing oil sludge according to claim 1, characterized in that,
the polymer-containing oil sludge solid residue phase is added with dehydrated biochemical sludge before entering the drying reactor, and the addition amount is 0-15% of the weight of the polymer-containing oil sludge solid residue phase.
7. The pyrolysis-extraction circulating resource treatment process method for polymer-containing oil sludge according to claim 1, wherein a flocculating agent B is injected at an inlet of the coalescence air flotation device, and the flocculating agent B is a compound product of one or more of polyaluminium chloride, polyferric chloride and poly dimethyl diallyl ammonium chloride.
8. A pyrolysis-extraction circulating resource treatment system containing polymer oil sludge comprises an extraction separation system, a pyrolysis reaction system and a sewage treatment system, wherein the extraction separation system comprises an extraction reactor, a screw pump, a three-phase centrifuge, a crude oil lift pump and a crude oil buffer tank which are sequentially connected; the pyrolysis reaction system comprises a drying reactor, a pyrolysis reactor and a condenser which are connected in sequence, the sewage treatment system comprises a sewage buffer tank, a sewage lift pump, a coalescence air flotation device, a ceramic membrane filter inlet lift pump, a ceramic membrane filter and a reclaimed water buffer tank which are connected in sequence,
the system also comprises a noncondensable gas treatment system, the pyrolysis reaction system also comprises a primary heat exchanger, a secondary heat exchanger and a three-phase separator, a gas phase outlet of the pyrolysis reactor is sequentially connected with the primary heat exchanger, the secondary heat exchanger, a condenser and the three-phase separator, a pyrolysis oil outlet of the three-phase separator is connected with the secondary heat exchanger through a pyrolysis oil lifting pump, and an outlet of the secondary heat exchanger is connected with an inlet of the extraction reactor, so that pyrolysis oil returns to the extraction reactor after heat exchange; the non-condensable gas outlet of the three-phase separator is connected with the non-condensable gas processing system, the non-condensable gas processing system comprises a bag type dust collector, a cyclone separator, a non-condensable gas compressor and a non-condensable gas buffer tank which are sequentially connected, and the bag type dust collector is connected with the non-condensable gas outlet of the three-phase separator; the sewage outlet of three-phase separator with sewage treatment system connect, sewage treatment system still including dissolving the gas pitcher, dissolve the gas pitcher and be equipped with gas inlet, liquid inlet and dissolve the gas export, wherein gas inlet connects noncondensable gas buffer tank, makes the partial noncondensable gas get into and dissolves the gas pitcher, the liquid inlet is connected with the backward flow water pipe of coalescence air supporting device, dissolves the gas export of dissolving the gas pitcher and dissolves the gas entry linkage with coalescence air supporting device to the water of dissolving that obtains with the thorough mixing of noncondensable gas of backward flow water flows back to coalescence air supporting device.
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| CN111778059B (en) * | 2020-07-07 | 2022-04-08 | 中国石油大学(华东) | Oil sludge sand pre-separation-oil recovery-post-treatment system and process |
| CN114517104B (en) * | 2020-11-19 | 2023-09-05 | 中国石油化工股份有限公司 | Oily sludge-based biochar and preparation method and application thereof |
| CN112723698A (en) * | 2020-12-04 | 2021-04-30 | 陕西欧菲德环保科技有限公司 | Harmless treatment system and treatment process for tank cleaning oil sludge |
| CN113060864A (en) * | 2021-03-25 | 2021-07-02 | 中汇金源（北京）科技发展有限公司 | Process for purifying and recycling petrochemical oily sewage and sump oil |
| CN115448562A (en) * | 2021-06-09 | 2022-12-09 | 中国石油天然气集团有限公司 | Oily sludge pyrolysis treatment system and method |
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