CN115180709A - Oil recovery waste water treatment and supercritical multi-element thermal fluid generation system - Google Patents
Oil recovery waste water treatment and supercritical multi-element thermal fluid generation system Download PDFInfo
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- CN115180709A CN115180709A CN202210799626.8A CN202210799626A CN115180709A CN 115180709 A CN115180709 A CN 115180709A CN 202210799626 A CN202210799626 A CN 202210799626A CN 115180709 A CN115180709 A CN 115180709A
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/74—Treatment of water, waste water, or sewage by oxidation with air
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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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
- 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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/03—Pressure
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/06—Pressure conditions
- C02F2301/066—Overpressure, high pressure
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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
- C02F2303/10—Energy recovery
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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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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
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Abstract
The utility model provides an oil recovery waste water treatment and many first hot fluid of supercritical generation system, including supercritical water gasification reactor, the product outlet pipe of supercritical water gasification reactor is connected in supercritical water oxidation reactor, supercritical water oxidation reactor's side is connected in first ejector, first ejector is connected in air storage tank and pure water jar, pure water and air form high pressure gas-water mixture in first ejector, pour into supercritical water oxidation reactor into, supercritical water oxidation reactor bottom is connected in supercritical water gasification reactor and second ejector respectively, the second ejector is connected in the carbon dioxide storage tank, one part of the oxidation product of supercritical water oxidation reactor is as the heat source and gets into in the supercritical water gasification reactor and continue the concurrent heating, another part is as many first hot fluids, supply the oil field to drive and adopt, the invention realizes the high-efficient processing of oil recovery waste water through supercritical water gasification reaction, supercritical water oxidation reaction produces many first hot fluids of supercritical and supplies with the viscous crude exploitation.
Description
Technical Field
The invention relates to the technical field of energy environment, in particular to an oil extraction wastewater treatment and supercritical multi-element thermal fluid generation system.
Background
The thick oil is difficult to recover due to large viscosity and poor fluidity, and the traditional thick oil recovery technology comprises chemical agent viscosity reduction and thermal viscosity reduction. The exploitation method utilizing thermal viscosity reduction mainly comprises the methods of steam flooding, steam huff and puff and the like. The method mainly utilizes steam generated by a steam injection boiler to carry out heavy oil thermal recovery, but because the steam cost is high, and in areas with shortage of water resources and high water price, the steam cost is further increased by high water treatment cost.
The multi-element thermal fluid mining technology refers to steam auxiliary N 2 、CO 2 The combined huff and puff technology for gas uses the principle of rocket engine high pressure combustion to inject high pressure air and diesel oil (or natural gas) into the generator, and vaporizes the water injected into the generator by combustion to produce high temperature and high pressure N 2 、CO 2 And mixing with water vapor to form the multi-element thermal fluid. The technology has the characteristics of gas miscible flooding (nitrogen flooding and carbon dioxide flooding) and thermal oil recovery (steam huff and puff and steam flooding), not only has the characteristics of conventional thermal recovery, but also has the characteristics of gas viscosity reduction and expansion, and can effectively improve the yield increase effect of a single well.
A large amount of oil extraction wastewater can be generated in the existing oil field exploitation process, and the wastewater contains a large amount of organic matters and inorganic salts and has great influence on ecology. In addition, in the mining environment such as land or ocean, the demand of water resources is large, and the corresponding environment fresh water resources are in short supply, so the cost is high.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an oil extraction wastewater treatment and supercritical multi-element thermal fluid generation system which realizes the high-efficiency treatment of oil extraction wastewater by obtaining hydrogen-rich fuel gas through supercritical water gasification of oil extraction wastewater, generates supercritical multi-element thermal fluid through supercritical water oxidation of the hydrogen-rich fuel gas and supplies the supercritical multi-element thermal fluid to thickened oil exploitation, and realizes the oil extraction wastewater treatment and the high-efficiency thickened oil exploitation.
In order to achieve the purpose, the invention adopts the following technical scheme:
a product outlet pipe of the supercritical water gasification reactor is connected with a supercritical water oxidation reactor, a wastewater injection pipe is arranged at the bottom of the supercritical water gasification reactor, oil-production wastewater is injected into the supercritical water gasification reactor through the wastewater injection pipe to generate supercritical water gasification reaction, a gasification product enters the supercritical water oxidation reactor through the product outlet pipe, the side surface of the supercritical water oxidation reactor is connected with a first ejector, the first ejector is connected with an air storage tank and a pure water tank, pure water is injected into the first ejector as working fluid, air of the air storage tank enters the first ejector as injected fluid, the pure water and the air form high-pressure gas-water mixture in the first ejector and are injected into the supercritical water oxidation reactor, the bottom of the supercritical water oxidation reactor is respectively connected with the supercritical water gasification reactor and a second ejector, the second ejector is connected with a carbon dioxide storage tank, one part of the oxidation product of the air oxidation reactor enters the gasification reactor as heat source for continuously supplementing heat, the other part of the supercritical water oxidation reactor as the working fluid of the second ejector, the carbon dioxide is used as the working fluid of the second ejector, and the supercritical water oxidation reactor is used as the multi-element fluid for producing oil field.
Furthermore, the supercritical gasification reactor comprises a first pressure-bearing outer shell and a first porous inner shell which are coaxially arranged, a heat source injection port is arranged on the side surface of the first pressure-bearing outer shell and connected to the bottom of the supercritical water oxidation reactor, and an oxidation product of the supercritical water oxidation reactor enters between the first pressure-bearing outer shell and the first porous inner shell through the heat source injection port and permeates into the first porous inner shell.
Further, the first pressure-bearing shell comprises an upper conical section, a cylindrical section and a lower conical section which are connected from top to bottom, and the inner wall of the upper conical section is provided with a plurality of layers of coaxial conical baffles.
Furthermore, the supercritical water oxidation reactor comprises a second pressure-bearing outer shell and a second porous inner shell which are coaxially arranged, an annular space between the second porous inner shell and the second pressure-bearing outer shell forms a cooling channel, a cooling liquid injection port is formed in the side wall of the second pressure-bearing outer shell, and the cooling liquid injection port is connected to the first ejector.
Further, a first flow regulating valve and a first one-way valve are arranged between the air storage tank and the first ejector.
Further, the waste water injection pipe by the middle part is extended to supercritical water gasification reactor's bottom, waste water injection union coupling is in first pre-heater, first pre-heater is connected in the waste water booster pump, the waste water booster pump is connected in the waste water jar, oil recovery waste water by the waste water jar warp waste water booster pump pressure boost, through first pre-heater gets into after preheating the waste water injection pipe, by waste water injection pipe top blowout carries out supercritical water gasification reaction.
Further, supercritical water gasification reactor bottom one side is equipped with the strong brine discharge pipe, the strong brine discharge pipe connect in first pre-heater, first pre-heater is connected in the second pre-heater, the second pre-heater is connected in vapour and liquid separator, vapour and liquid separator connect in the carbon dioxide storage tank, the second pre-heater with be equipped with the back pressure valve between the vapour and liquid separator, strong brine passes through after twice heat transfer the back pressure valve gets into when dropping to the ordinary pressure vapour and liquid separator, and the carbon dioxide gas of separation gets into the carbon dioxide storage tank, the liquid discharge of separation or subsequent processing.
Furthermore, a bypass is arranged between the second preheater and the back pressure valve and connected with the second ejector, and a second flow regulating valve is arranged on the bypass.
Furthermore, a second one-way valve and a third flow regulating valve are arranged between the carbon dioxide storage tank and the second ejector, and the third flow regulating valve and the second flow regulating valve are connected with the temperature and pressure annunciator and can be regulated independently or in a linkage manner.
Further, the well lower part of supercritical water gasification reactor is equipped with the cooling water filling pipe, the cooling water filling pipe connect in the second pre-heater, the second pre-heater is connected in the cooling water booster pump, the cooling water booster pump is connected in the cooling water pitcher, cooling water in the cooling water pitcher passes through the cooling water booster pump pressure boost, and the warp follow after the second pre-heater preheats the cooling water filling pipe gets into supercritical water gasification reactor.
The invention has the beneficial effects that:
oil recovery waste water is injected into supercritical water gasification reactor by waste water injection pipe and is taken place supercritical water gasification reaction, gasification result gets into supercritical water oxidation reactor by the product outlet pipe, the high pressure gas-water mixture that pure water and air formed in first ejector get into supercritical water oxidation reactor and take place supercritical water oxidation reaction, oxidation product partly is as gasification reaction's heat source, another part carries out the displacement of reservoir oil as many units hot-fluid, and supercritical water gasification reactor bottom exhaust low-temperature fluid and the carbon dioxide of separating can mix with many units hot-fluid, through adjusting the flow, form different temperatures, the many units hot-fluid of pressure and component, the oil field that adapts to different grade type and condition drives and adopts. According to the invention, the high-efficiency treatment of the oil extraction wastewater is realized by obtaining the hydrogen-rich fuel gas through supercritical water gasification of the oil extraction wastewater, the hydrogen-rich fuel gas is subjected to supercritical water oxidation to generate supercritical multi-element thermal fluid for thick oil exploitation, and the energy cycle of oil extraction wastewater treatment and thick oil high-efficiency exploitation is realized.
Drawings
FIG. 1 is a schematic diagram of the oil-extraction wastewater treatment and supercritical multi-element thermal fluid generation system according to the present invention;
FIG. 2 is a schematic structural view of the supercritical water gasification reactor of FIG. 1;
FIG. 3 is a schematic structural diagram of the supercritical water oxidation reactor shown in FIG. 1;
in the figure, 1-supercritical water gasification reactor, 101-first pressure-bearing outer shell, 102-first porous inner shell, 103-upper conical section, 104-cylindrical section, 105-lower conical section, 106-product outlet pipe, 107-heat source injection port, 108-wastewater injection pipe, 109-cooling water injection pipe, 110-strong brine discharge pipe, 111-conical baffle, 112-upper fixed ring, 113-lower fixed ring, 2-supercritical water oxidation reactor, 201-second pressure-bearing outer shell, 202-second porous inner shell, 203-cooling channel, 204-cooling liquid injection port, 3-first ejector, 4-air storage tank, 5-first flow regulating valve, 6-first one-way valve, 7-pure water booster pump, 8-pure water tank, 9-temperature and pressure annunciator, 10-second ejector, 11-third flow regulating valve, 12-second one-way valve, 13-carbon dioxide storage tank, 14-gas-liquid separator, 15-cooling, 16-air-booster pump, 17-cooling water booster pump, 18-second flow regulating valve, 19-second preheater, 19-second flow regulating valve, 20-waste water tank, 22-waste water tank, 21-second waste water booster pump, 22-waste water tank, 22-first waste water booster pump.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
It should be noted that all directional indicators (such as up, down, left, right, front, back \8230;) in the embodiments of the present invention are only used to explain the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
Referring to fig. 1, the present invention provides an oil recovery wastewater treatment and supercritical multi-thermal fluid generation system, including a supercritical water gasification reactor 1, a product outlet pipe 106 of the supercritical water gasification reactor 1 is connected to a supercritical water oxidation reactor 2, a wastewater injection pipe 108 is arranged at the bottom of the supercritical water gasification reactor 1, oil recovery wastewater is injected into the supercritical water gasification reactor 1 through the wastewater injection pipe 108 to generate a supercritical water gasification reaction, a gasification product (hydrogen-rich fuel gas) enters the supercritical water oxidation reactor 2 through the product outlet pipe 106, the supercritical water oxidation reaction occurs in the supercritical water oxidation reactor 2, a part of the oxidation product is used as a heat source to enter the supercritical water gasification reactor 1 for continuous heat compensation, and the other part is used as multi-thermal fluid for oil displacement, and low-temperature fluid and separated carbon dioxide discharged from the bottom of the supercritical water gasification reactor 1 can be mixed with multi-thermal fluid, by adjusting flow rate, multi-thermal fluid with different temperatures, pressures and components is formed, which is suitable for oil displacement and recovery, and energy cycle of oil recovery with high efficiency is realized.
Referring to fig. 1 and 2, the supercritical water gasification reactor 1 includes a first pressure-bearing outer shell 101 and a first porous inner shell 102, which are coaxially disposed, the first pressure-bearing outer shell 101 includes an upper conical section 103, a cylindrical section 104 and a lower conical section 105, which are connected from top to bottom, wherein the lower conical section 105 is in an inverted cone shape. Go up the toper section 103 top center and be equipped with product outlet pipe 106, the lateral wall of cylinder section 104 is equipped with heat source injection mouth 107, and heat source injection mouth 107 is connected to a plurality of heat source injection pipes, and the heat source injection pipe evenly sets up in the axial and the circumferencial direction of cylinder section, and in this embodiment, the heat source injection mouth evenly arranges 2-4 heat source injection pipes respectively in the axial of cylinder section and circumferencial direction, makes the heat source evenly inject in supercritical water gasification reactor 1. The lower middle portion of the lower conical section 105 is provided with a cooling water injection pipe 109, and the outlet of the cooling water injection pipe 109 faces downward. The center of 105 bottoms of toper section is equipped with waste water injection pipe 108 down, and waste water injection pipe 108 upwards extends to the upper portion of cylinder section 104, because waste water injection pipe 108 deepens the length of supercritical water gasification reactor 1 for waste water is further preheated the back blowout in supercritical water gasification reactor 1, and then carries out preliminary supercritical water gasification reaction. One side of the lower conical section 105 is also provided with a strong brine discharge pipe 110.
The first porous inner shell 102 is arranged inside the cylindrical section 104 and is flush with the upper end and the lower end of the cylindrical section 104, the shell wall of the first porous inner shell 102 is uniformly provided with a plurality of small holes, and a heat source enters between the first pressure-bearing outer shell 101 and the first porous inner shell 102 through the heat source injection port 107 and permeates into the first porous inner shell 102 through the small holes. The top of the first porous inner shell 102 is connected to the top of the cylindrical section 104 through an upper fixing ring 112, the bottom of the first porous inner shell 102 is connected to the bottom of the cylindrical section 104 through a lower fixing ring 113, and a heating protection annular gap is formed among the cylindrical section 104, the first porous inner shell 102, the upper fixing ring 112 and the lower fixing ring 113. Preferably, the upper retaining ring 112 and the lower retaining ring 113 are elastic members to facilitate the installation, retention, and sealing of the first porous inner shell 102. In this embodiment, the material of the first porous inner shell 102 includes temperature-resistant and corrosion-resistant ceramics, titanium alloy, austenite alloy, etc., and may be sintered and woven, and the porosity of the first porous inner shell 102 is 10-40%, and the pore size is 10-50 μm, so as to achieve uniform distribution of heat source along the circumference and avoid the deposition of inorganic salts and coke to block the porous channel.
Preferably, the wall thickness of the first porous inner shell 102 is gradually reduced from top to bottom to form an inverted cone, and the inclination angle β is 75 to 85 °, so as to realize gradual pressurization of the injection amount of the high-temperature heat source from top to bottom and compensate for the trend that the reaction temperature gradually decreases from top to bottom.
Preferably, the upper conical section 103 is provided with a plurality of layers of coaxial conical baffles 111, the included angle alpha between the conical baffles 111 and the horizontal direction is 20-80 degrees, after the oil extraction wastewater is sprayed out from the wastewater injection pipe 108, the oil extraction wastewater is subjected to a primary supercritical water gasification reaction, the reaction product is subjected to gas-solid separation under the action of gravity and the inertia separation effect of the conical baffles 111, and the fuel product rich in hydrogen is discharged from the product outlet pipe 106. The supercritical water gasification reactor 1 realizes high-efficiency gas-solid separation and forms clean hydrogen-rich gas fuel, so that the subsequent supercritical water oxidation reaction process can be carried out efficiently and cleanly.
As shown in fig. 1 and fig. 3, the supercritical water oxidation reactor 2 includes a second pressure-bearing outer shell 201 and a second porous inner shell 202 which are coaxially arranged, an annular space between the second porous inner shell 202 and the second pressure-bearing outer shell 201 forms a cooling channel 203, a cooling liquid injection port 204 is arranged on the side wall of the second pressure-bearing outer shell 201, and the cooling liquid injection port 204 is connected to the first ejector 3. First ejector 3 is connected respectively in air storage tank 4 and pure water tank 8, is equipped with first flow control valve 5 and first check valve 6 between air storage tank 4 and the first ejector 3, is equipped with pure water booster pump 7 between pure water tank 8 and the first ejector 3, and the pure water in the pure water tank 8 pours into first ejector 3 into as working fluid into after the pure water booster pump 7 pressure boost, and the pressure after the pure water pressure boost is 1-5MPa bigger than the pressure after the waste water pressure boost. Air in the air storage tank 4 enters the first ejector 3 as injected fluid after passing through the first regulating valve 5 and the first one-way valve 6, pure water and air form a high-pressure air-water mixture in the first ejector 3, the pure water and the air are injected from a cooling liquid injection port 204 on the side surface of the supercritical water oxidation reactor 2, and uniform distribution and input of radial fluid are realized through the second porous inner shell 202. The oxygen flow in the air is 1-1.2 times of the oxygen required by the complete oxidation of the organic matters in the wastewater, the hydrogen-rich fuel product and the oxygen gradually generate supercritical water oxidation reaction in the supercritical water oxidation reactor 2, and a high-temperature and high-pressure mixed product is formed and is discharged from an outlet at the bottom of the supercritical water oxidation reactor 2. The temperature of the outlet reaction product is 500-700 ℃, supercritical water is formed, and the mixed medium contains a large amount of carbon dioxide, nitrogen and a small amount of oxygen. Air is input from the radial direction, namely oxygen required by oxidation is uniformly distributed and injected along the axial direction, the oxidation reaction of the organic matters is gradually developed along the axial line, the reaction heat of the organic matters is released orderly, and the concentrated release of the reaction heat is avoided. The double-shell structure avoids overheating of the second pressure-bearing outer shell 201, and the cooling water rich in air scours, cools and protects the wall surface of the second porous inner shell 202, and further controls the safety of the supercritical water oxidation reactor 2.
The bottom of the supercritical water oxidation reactor 2 is respectively connected with a heat source injection port 107 and a second ejector 10 on the side surface of the supercritical water gasification reactor 1, the second ejector 10 is connected with a carbon dioxide storage tank 13, a second one-way valve 12 and a third flow regulating valve 11 are arranged between the carbon dioxide storage tank 13 and the second ejector 10, one part of an oxidation product of the supercritical water oxidation reactor 2 is used as a heat source to continuously supplement heat in the supercritical water gasification reactor 1, the other part of the oxidation product is used as a working fluid of the second ejector 10, the carbon dioxide is used as an injected fluid of the second ejector 10, and the oxidation product and the carbon dioxide form a multi-element thermal fluid in the second ejector 10 and are supplied to an oil field for flooding.
A part of the reaction product is injected into the heating protection annular space through a plurality of heat source injection pipes of the heat source injection port 107 and uniformly permeates into the supercritical water gasification reactor 1 through the first porous inner shell 102. The heat source fluid injected from the side surface protects the inside of the first porous inner shell 102 by scouring, so that the problems of corrosion, salt deposition, coking of supercritical water gasification reaction and the like in the reaction process are avoided. On the other hand, because of the endothermic characteristic of the supercritical water gasification reaction, the reaction temperature can be gradually reduced to influence the reaction efficiency and the reaction speed, and the high-temperature characteristic of the fluid injected from the side surface can uniformly and continuously supplement heat for the supercritical water gasification reaction, thereby promoting the gasification reaction of organic matters. Moreover, the radial velocity of the fluid injected from the side surface is coupled with the axial velocity of the reactant, so that the heat and mass transfer of the central gasification reaction can be enhanced, and the reaction is further accelerated. Finally, because the heat source fluid contains a small amount of oxygen, more active reaction groups (such as OH) can be provided under the supercritical water condition, the partial oxidation reaction of the organic matters can be promoted, the decomposition of the organic matters is accelerated, and more hydrogen-rich fuel gas products are formed. Carbon dioxide that produces in the supercritical water oxidation reactor 2 combines the nitrogen gas in the air to get into supercritical water gasification reactor 1 jointly, and follow-up further enrichment recirculation returns supercritical water oxidation reactor 2, because the non-reaction of self with dilute the cooling characteristic, can slow down the reaction heat in the supercritical water oxidation reactor 2 and release, avoids supercritical water oxidation reactor 2's overheat. The cyclic utilization of oxygen not only accelerates gasification, but also enables the whole system to operate efficiently under the condition of low oxygen content coefficient, thereby greatly reducing the operation cost of the system.
The waste water injection pipe 108 of the bottom of supercritical water gasification reactor 1 is connected in first preheater 22, and first preheater 22 is connected in waste water booster pump 21, and waste water booster pump 21 is connected in waste water tank 20, and oil recovery waste water preheats back by waste water tank 20 through waste water booster pump 21 pressure boost to more than 23MPa through first preheater 22 and gets into waste water injection pipe 108, carries out supercritical water gasification reaction by the blowout of waste water injection pipe 108 top. The concentration of organic matters in the wastewater is 1-30wt.%, and the content of inorganic salts is 1-10wt.%. Because the waste water injection pipe 106 goes deep into the length of supercritical water gasification reactor 1 for waste water can be further preheated in supercritical water gasification reactor 1 and then ejected, supercritical water gasification reaction is carried out. The reaction product is subjected to the gravity and the inertial separation action of the conical baffle 111 to realize gas-solid separation, so that a fuel product rich in hydrogen is formed and is discharged from the product outlet pipe 106.
Cooling water injection pipe 109 of lower part connects in second preheater 19 in supercritical water gasification reactor 1, second preheater 19 connects in cooling water booster pump 17, cooling water booster pump 17 connects in cooling water tank 15, the cooling water in cooling water tank 15 passes through cooling water booster pump 17 pressure boost to more than 23MPa, and get into supercritical water gasification reactor 1 from cooling water injection pipe 109 after second preheater 19 preheats, 1 lower part of supercritical water gasification reactor and then form the cooling space, the cooling space can realize the cooling and dissolving of inorganic salt, avoid the jam of supercritical water gasification reactor 1 and be favorable to subsequent separation.
Strong brine discharge pipe 110 of supercritical water gasification reactor 1 cooling zone is connected in first preheater 22, first preheater 22 is connected in second preheater 19, second preheater 19 is connected in vapour and liquid separator 14, vapour and liquid separator 14 is connected in carbon dioxide storage tank 13, be equipped with back pressure valve 16 between second preheater 19 and vapour and liquid separator 14, inorganic salt in the waste water is precipitated and falls into the cooling zone of supercritical water gasification reactor 1 lower part in the reaction process, and the lower part cooling zone can dissolve and absorb the carbon dioxide that partial oxidation produced, form the strong brine jointly, the strong brine gets into first preheater 22 earlier and preheats waste water, then preheat the cooling water through second preheater 19, retrieve the surplus heat, after two heat exchanges the back and drop into gas-liquid separator 14 when the ordinary pressure through back pressure valve 16, the high-purity carbon dioxide gas of separation gets into carbon dioxide storage tank 13 and carries out the follow-up utilization, the liquid discharge of separation or subsequent processing.
A bypass is arranged between the second preheater 19 and the backpressure valve 16 and is connected with the second ejector 10, and a second flow regulating valve 18 is arranged on the bypass. The second flow regulating valve 18 and the third flow regulating valve 11 are connected with the temperature and pressure annunciator 9, and can be regulated independently or in a linkage manner, so that the temperature, the pressure and the components of the multi-element thermal fluid can be regulated in a coordinated manner, the multi-element thermal fluid with different parameters can be formed, and the oil field can be driven and exploited according to different types and conditions.
According to the invention, the high-efficiency treatment of the oil extraction wastewater is realized by obtaining the hydrogen-rich fuel gas through the supercritical water gasification of the oil extraction wastewater, the hydrogen-rich fuel gas is subjected to supercritical water oxidation reaction to generate supercritical multi-element thermal fluid which is supplied to thick oil exploitation, the other part of the hydrogen-rich fuel gas is used as a heat source to supplement the supercritical water gasification reaction, and the residual energy is discharged through the dissolved brine and respectively used as a preheating heat source of waste liquid and a preheating heat source of cooling water, so that a high-efficiency energy utilization system is formed.
Although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the true spirit and scope of the present invention, which is defined by the claims appended hereto.
Claims (10)
1. An oil recovery wastewater treatment and supercritical multi-element thermal fluid generation system is characterized by comprising: the supercritical water gasification reactor, the product outlet pipe of supercritical water gasification reactor is connected in supercritical water oxidation reactor, the bottom of supercritical water gasification reactor is equipped with the waste water injection pipe, oil recovery waste water by the waste water injection pipe is injected supercritical water gasification reactor takes place supercritical water gasification reaction, the gasification result by the product outlet pipe gets into supercritical water oxidation reactor, the side of supercritical water oxidation reactor is connected in first ejector, first ejector is connected in air storage tank and pure water jar, and pure water pours into as working fluid first ejector, and the air of air storage tank is as being drawn the fluid and get into first ejector, and pure water and air are in form high-pressure air water mixture in the first ejector, pour into supercritical water oxidation reactor, supercritical water oxidation reactor bottom connect respectively in supercritical water gasification reactor and second ejector, the second ejector is connected in the carbon dioxide storage tank, a part of the oxidation product of supercritical water oxidation reactor gets into as the heat source in the supercritical water gasification reactor lasts the concurrent heat supply, another part is as the working fluid of second ejector, carbon dioxide is as the fluid of second ejector, oxidation product with the injection element forms the hot fluid in the oil field of second ejector, the hot fluid of oil field collection.
2. The oil recovery wastewater treatment and supercritical multi-element thermal fluid generation system according to claim 1, characterized in that: the supercritical gasification reactor comprises a first pressure-bearing outer shell and a first porous inner shell which are coaxially arranged, a heat source injection port is arranged on the side surface of the first pressure-bearing outer shell and connected to the bottom of the supercritical water oxidation reactor, and an oxidation product of the supercritical water oxidation reactor enters between the first pressure-bearing outer shell and the first porous inner shell through the heat source injection port and permeates into the first porous inner shell.
3. The oil recovery wastewater treatment and supercritical multi-element thermal fluid generation system according to claim 2, characterized in that: the first pressure-bearing shell comprises an upper conical section, a cylindrical section and a lower conical section which are connected from top to bottom, and the inner wall of the upper conical section is provided with a plurality of layers of coaxial conical baffles.
4. The oil recovery wastewater treatment and supercritical multi-element thermal fluid generation system according to claim 1, characterized in that: the supercritical water oxidation reactor comprises a second pressure-bearing outer shell and a second porous inner shell which are coaxially arranged, an annular space between the second porous inner shell and the second pressure-bearing outer shell forms a cooling channel, a cooling liquid injection port is formed in the side wall of the second pressure-bearing outer shell, and the cooling liquid injection port is connected to the first ejector.
5. The oil recovery wastewater treatment and supercritical multi-element thermal fluid generation system according to claim 1, characterized in that: a first flow regulating valve and a first one-way valve are arranged between the air storage tank and the first ejector.
6. The oil recovery wastewater treatment and supercritical multi-element thermal fluid generation system according to claim 1, characterized in that: the waste water injection pipe by the middle part is extended to supercritical water gasification reactor's bottom, waste water injection union coupling is in first pre-heater, first pre-heater is connected in the waste water booster pump, the waste water booster pump is connected in the waste water jar, oil recovery waste water by the waste water jar warp the waste water booster pump pressure boost, through get into after first pre-heater preheats the waste water injection pipe, by waste water injection pipe top blowout carries out supercritical water gasification reaction.
7. The oil recovery wastewater treatment and supercritical multi-element thermal fluid generation system according to claim 6, wherein: the supercritical water gasification reactor is characterized in that a strong brine discharge pipe is arranged on one side of the bottom of the supercritical water gasification reactor, the strong brine discharge pipe is connected to a first preheater, the first preheater is connected to a second preheater, the second preheater is connected to a gas-liquid separator, the gas-liquid separator is connected to a carbon dioxide storage tank, a back pressure valve is arranged between the second preheater and the gas-liquid separator, the strong brine passes through the back pressure valve after twice heat exchange and enters the gas-liquid separator when the back pressure valve is reduced to the normal pressure, the separated carbon dioxide gas enters the carbon dioxide storage tank, and the separated liquid is discharged or subjected to subsequent treatment.
8. The oil recovery wastewater treatment and supercritical multi-element thermal fluid generation system according to claim 7, characterized in that: and a bypass is arranged between the second preheater and the back pressure valve and is connected with the second ejector, and a second flow regulating valve is arranged on the bypass.
9. The oil recovery wastewater treatment and supercritical multi-element thermal fluid generation system according to claim 8, wherein: and a second one-way valve and a third flow regulating valve are arranged between the carbon dioxide storage tank and the second ejector, and the third flow regulating valve and the second flow regulating valve are connected with a temperature and pressure annunciator and can be regulated independently or in a linkage manner.
10. The oil recovery wastewater treatment and supercritical multi-element thermal fluid generation system according to claim 7, wherein: the well lower part of supercritical water gasification reactor is equipped with the cooling water injection pipe, the cooling water injection pipe connect in the second pre-heater, the second pre-heater is connected in the cooling water booster pump, the cooling water booster pump is connected in the cooling water pitcher, cooling water in the cooling water pitcher passes through the cooling water booster pump pressure boost, and the warp follow after the second pre-heater preheats the cooling water injection pipe gets into supercritical water gasification reactor.
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