Flow-direction-variable cold-carrying circulation oil gas recovery system

Abstract

The invention relates to the technical field of oil gas recovery, and discloses a variable-flow-direction cold-carrying circulation oil gas recovery system which comprises a variable-flow-direction oil gas cooling liquefaction recovery subsystem and a cold-carrying circulation heat recovery subsystem. The variable-flow-direction oil gas cooling, liquefying and recycling subsystem comprises a first-stage cooling module, a second-stage cooling module, a third-stage cooling module and a fourth-stage heating module which are sequentially communicated through oil gas connecting pipes; the secondary refrigerant circulation heat recovery subsystem comprises a first-stage oil gas condenser A, a first-stage oil gas condenser B, a first secondary refrigerant valve, a second secondary refrigerant valve, a secondary refrigerant pump, a fourth-stage oil gas heater, a third secondary refrigerant valve and a fourth secondary refrigerant valve. The flow-direction-variable cold-carrying circulation oil gas recovery system has the advantages of being low in energy consumption, energy-saving, environment-friendly, simple in refrigerating system, low in cost, high in reliability and the like, and the energy-saving and environment-friendly performance, the cost performance and the operation reliability of the oil gas recovery system are greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas recovery, and in particular to a variable flow direction cooling circulation oil and gas recovery system. Background Art

[0002] At present, there are common oil and gas recovery systems that can be used for multi-stage deep cooling, with the lowest temperature reaching about -70°C. They are used to condense and liquefy volatile organic compounds in oil and gas (VOCs gas) to recover them. While reducing environmental pollution, the recovered volatile organic compounds can also generate considerable economic benefits.

[0003] However, this type of ordinary oil and gas recovery system will cool the imported oil and gas to -70℃ after multi-stage cooling. The -70℃ oil and gas exhaust gas after cooling and recovery is generally discharged directly into the atmosphere, or heated to about 10℃ by an additional heating device before being discharged into the atmosphere. However, the -70℃ oil and gas exhaust gas at the outlet of the final variable flow cold circulation oil and gas recovery system has a large amount of high-grade refrigeration capacity, which is discharged into the atmosphere in vain or requires energy to be consumed for heating the low-temperature oil and gas before being discharged. This method makes the traditional oil and gas recovery system have many problems such as high energy consumption, high pollution, complex refrigeration system, high cost, low reliability, etc., which seriously restricts the development of oil and gas condensation equipment.

[0004] Therefore, the prior art still needs to be improved and enhanced. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a variable flow refrigeration circulation oil and gas recovery system, aiming to solve the problems of high energy consumption, high pollution, complex refrigeration system, high cost and low reliability in traditional oil and gas recovery systems.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A variable flow direction cooling circulation oil and gas recovery system, characterized in that it comprises: a variable flow direction oil and gas cooling liquefaction recovery subsystem and a cooling circulation heat recovery subsystem; the variable flow direction oil and gas cooling liquefaction recovery subsystem comprises a primary cooling module, a secondary cooling module, a tertiary cooling module, and a quaternary heating module which are sequentially connected through an oil and gas connecting pipe; wherein the primary cooling module comprises: an oil and gas inlet (21), a first oil and gas valve (22), a second oil and gas valve (23), a primary cooling box (24), a third oil and gas valve (25), a fourth oil and gas valve (26) and a first oil and gas connecting pipe (27); the oil and gas inlet (21) is divided into two paths, one of which is connected to the first oil and gas valve (22) and the other is connected to the first oil and gas valve (22). The first oil and gas valve (22) is connected to one end of the first oil and gas valve (23), the other end of the first oil and gas valve (22) is connected to the inlet of the first cooling box (24), and the other end of the second oil and gas valve (23) is connected to the outlet of the first cooling box (24); the inlet of the first cooling box (24) is also connected to one end of the fourth oil and gas valve (26), the outlet of the first cooling box (24) is also connected to one end of the third oil and gas valve (25), the other end of the third oil and gas valve (25) is connected to the other end of the fourth oil and gas valve (26), and is connected to one end of the first oil and gas connecting pipe (27); the cooling cycle heat recovery subsystem comprises: a first oil and gas condenser A (31) and a first oil and gas condenser B (32), a first carrier A refrigerant valve (33), a second refrigerant valve (34), a refrigerant pump (35), a fourth-stage oil-gas heater (36), a third refrigerant valve (37), and a fourth refrigerant valve (38); the first-stage oil-gas condenser A (31) and the first-stage oil-gas condenser B (32) are placed side by side and are both installed in the first-stage cooling box (24), and the first-stage oil-gas condenser (A) is adjacent to the inlet of the first-stage cooling box (24), and the first-stage oil-gas condenser B (32) is adjacent to the outlet of the first-stage cooling box (24); the refrigerant outlet of the first-stage oil-gas condenser A (31) is connected to one end of the first refrigerant valve (33); the refrigerant outlet of the first-stage oil-gas condenser B (32) is connected to one end of the first refrigerant valve (33); The first refrigerant valve (33) is connected to one end of the second refrigerant valve (34); the other end of the first refrigerant valve (33) is connected to the other end of the second refrigerant valve (34), and then connected to one end of a refrigerant pump (35); the other end of the refrigerant pump (35) is connected to the refrigerant inlet of the fourth-stage oil-gas heater (36); the refrigerant outlet of the fourth-stage oil-gas heater (36) is divided into two paths, one of which is connected to one end of the third refrigerant valve (37), and the other is connected to one end of the fourth refrigerant valve (38); the other end of the third refrigerant valve (37) is connected to the refrigerant inlet of the first-stage oil-gas condenser A (31), and the other end of the fourth refrigerant valve (38) is connected to the refrigerant inlet of the first-stage oil-gas condenser B (32).

[0008] The variable flow direction refrigeration circulation oil and gas recovery system, wherein the secondary cooling module includes a secondary oil and gas condenser A (28), a secondary oil and gas condenser B (29), a fifth oil and gas valve (210), a sixth oil and gas valve (211), and a second oil and gas connecting pipe (212); the other end of the first oil and gas connecting pipe (27) is divided into two paths, one path is connected to one end of the secondary oil and gas condenser A (28), and the other path is connected to one end of the secondary oil and gas condenser B (29); the other end of the secondary oil and gas condenser A (28) is connected to one end of the fifth oil and gas valve (210), the other end of the secondary oil and gas condenser B (29) is connected to one end of the sixth oil and gas valve (211), the other end of the fifth oil and gas valve (210) is connected to the other end of the sixth oil and gas valve (211), and is connected to one end of the second oil and gas connecting pipe (212).

[0009] The variable flow direction refrigeration circulation oil and gas recovery system, wherein the three-stage cooling module includes a three-stage oil and gas condenser A (213), a three-stage oil and gas condenser B (214), a seventh oil and gas valve (215), an eighth oil and gas valve (216), and a third oil and gas connecting pipe (217); the other end of the second oil and gas connecting pipe (212) is divided into two paths, one path is connected to one end of the three-stage oil and gas condenser A (213), and the other path is connected to one end of the three-stage oil and gas condenser B (214); the other end of the three-stage oil and gas condenser A (213) is connected to one end of the seventh oil and gas valve (215), the other end of the three-stage oil and gas condenser B (214) is connected to one end of the eighth oil and gas valve (216), the other end of the seventh oil and gas valve (215) is connected to the other end of the eighth oil and gas valve (216), and is connected to one end of the third oil and gas connecting pipe (217).

[0010] The variable flow direction cooling circulation oil and gas recovery system, wherein the four-stage heating module includes a four-stage heating box (218) connected to the other end of the third oil and gas connecting pipe (217), and the other end of the four-stage heating box (218) is connected to the oil and gas outlet (219); the four-stage oil and gas heater (36) is installed in the four-stage heating box (218).

[0011] The variable flow direction refrigeration circulation oil and gas recovery system further includes a liquid oil outlet pipe (220), and the liquid oil outlet of the first-stage cooling box (24), the liquid oil outlet of the second-stage oil and gas condenser A (28), the liquid oil outlet of the second-stage oil and gas condenser B (29), the liquid oil outlet of the third-stage oil and gas condenser A (213), and the liquid oil outlet of the third-stage oil and gas condenser B (214) are all connected to the liquid oil outlet pipe (220).

[0012] Beneficial effects:

[0013] The present invention provides a variable flow direction cooling circulation oil and gas recovery system, which uses a relatively high temperature cooling medium coming out of a primary oil and gas condenser in a cooling circulation heat recovery subsystem, absorbs the coldness of oil and gas tail gas at about -70°C through a four-stage oil and gas heater, cools down to become a relatively low temperature cooling medium, and heats the -70°C oil and gas tail gas to about 10°C for discharge; the relatively low temperature cooling medium enters the primary oil and gas condenser, dissipates the coldness to reduce the temperature of the inlet oil and gas, absorbs the heat of the inlet oil and gas to heat up to become a relatively high temperature cooling medium, and thus circulates; based on the cooling circulation heat recovery subsystem, the present invention can effectively recover the coldness of oil and gas tail gas at about -70°C, and is used to replace the original compressor refrigeration to provide cooling capacity for the primary oil and gas condenser, reduce the compressor configuration of the primary oil and gas condenser, and greatly improve the energy utilization rate of the oil and gas recovery unit. The variable flow direction cooling circulation oil and gas recovery system provided by the present invention has the advantages of low energy consumption, energy saving and environmental protection, simple refrigeration system, low cost, high reliability, etc., and greatly improves the energy saving and environmental protection, cost performance and operation reliability of the oil and gas recovery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural diagram of the variable flow direction cooling circulation oil and gas recovery system provided by the present invention.

[0015] Main component symbol description: 21-oil and gas inlet, 22-first oil and gas valve, 23-second oil and gas valve, 24-first cooling box, 25-third oil and gas valve, 26-fourth oil and gas valve, 27-first oil and gas connecting pipe, 28-secondary oil and gas condenser A, 29-secondary oil and gas condenser B, 210-fifth oil and gas valve, 211-sixth oil and gas valve, 212-second oil and gas connecting pipe, 213-third-level oil and gas condenser A, 214-third-level oil Gas condenser B, 215-the seventh oil and gas valve, 216-the eighth oil and gas valve, 217-the third oil and gas connecting pipe, 218-the fourth-stage heating box, 219-the oil and gas outlet, 220-the liquid oil outlet pipe, 31-the first-stage oil and gas condenser A, 32-the first-stage oil and gas condenser B, 33-the first refrigerant valve, 34-the second refrigerant valve, 35-the refrigerant pump, 36-the fourth-stage oil and gas heater, 37-the third refrigerant valve, 38-the fourth refrigerant valve. DETAILED DESCRIPTION

[0016] The present invention provides a variable flow direction cooling circulation oil and gas recovery system. In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and examples.

[0017] In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "top", "bottom", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and cannot be understood as a limitation on the present invention; in addition, the terms "installation", "connection", etc. should be understood in a broad sense, and for ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] In traditional oil and gas recovery systems, the imported oil and gas are subjected to multi-stage cooling at around -70°C, and then discharged into the atmosphere in vain or even require energy to heat the low-temperature oil and gas before being discharged. The high-quality refrigeration capacity of the -70°C oil and gas exhaust gas is not effectively recovered and utilized, resulting in the traditional oil and gas recovery system having many problems such as high energy consumption, high pollution, complex refrigeration system, high cost, and low reliability.

[0019] In order to solve the problems of the traditional oil and gas recovery system, the present invention provides a variable flow direction cooling circulation oil and gas recovery system, such as Figure 1As shown, it comprises: a variable flow direction oil and gas cooling liquefaction recovery subsystem and a cooling circulation heat recovery subsystem; the variable flow direction oil and gas cooling liquefaction recovery subsystem comprises a primary cooling module, a secondary cooling module, a tertiary cooling module, and a quaternary heating module which are sequentially connected through an oil and gas connecting pipe; wherein the primary cooling module comprises: an oil and gas inlet (21), a first oil and gas valve (22), a second oil and gas valve (23), a primary cooling box (24), a third oil and gas valve (25), a fourth oil and gas valve (26) and a first oil and gas connecting pipe (27); the oil and gas inlet (21) is divided into two paths, one path is connected to one end of the first oil and gas valve (22), and the other path is connected to the second oil and gas valve (23). (23), the other end of the first oil and gas valve (22) is connected to the inlet of the first cooling box (24), and the other end of the second oil and gas valve (23) is connected to the outlet of the first cooling box (24); the inlet of the first cooling box (24) is also connected to one end of the fourth oil and gas valve (26), and the outlet of the first cooling box (24) is also connected to one end of the third oil and gas valve (25), and the other end of the third oil and gas valve (25) is connected to the other end of the fourth oil and gas valve (26), and is connected to one end of the first oil and gas connecting pipe (27); the cooling cycle heat recovery subsystem includes: a first oil and gas condenser A (31) and a first oil and gas condenser B (32), a first coolant valve (33), A second coolant valve (34), a coolant pump (35), a fourth oil-gas heater (36), a third coolant valve (37), and a fourth coolant valve (38); the first-stage oil-gas condenser A (31) and the first-stage oil-gas condenser B (32) are placed side by side and are both installed in the first-stage cooling box (24), and the first-stage oil-gas condenser (A) is adjacent to the inlet of the first-stage cooling box (24), and the first-stage oil-gas condenser B (32) is adjacent to the outlet of the first-stage cooling box (24); the coolant outlet of the first-stage oil-gas condenser A (31) is connected to one end of the first coolant valve (33); the coolant outlet of the first-stage oil-gas condenser B (32) is connected to the second coolant valve (33); The first refrigerant valve (34) is connected to one end of the refrigerant valve (34); the other end of the first refrigerant valve (33) is connected to the other end of the second refrigerant valve (34), and then connected to one end of a refrigerant pump (35); the other end of the refrigerant pump (35) is connected to the refrigerant inlet of the fourth-stage oil-gas heater (36); the refrigerant outlet of the fourth-stage oil-gas heater (36) is divided into two paths, one of which is connected to one end of the third refrigerant valve (37), and the other is connected to one end of the fourth refrigerant valve (38); the other end of the third refrigerant valve (37) is connected to the refrigerant inlet of the first-stage oil-gas condenser A (31), and the other end of the fourth refrigerant valve (38) is connected to the refrigerant inlet of the first-stage oil-gas condenser B (32).

[0020] In the present invention, the external high-temperature oil and gas is pressurized by a fan to become high-temperature and high-pressure oil and gas, which first enters the first-stage oil and gas condenser A (31) from the oil and gas inlet (21), and then enters the first-stage oil and gas condenser B (32) for cooling. At this time, the first coolant valve (33) and the third coolant valve (37) are closed to control the coolant not to pass through the first-stage oil and gas condenser A, and the second coolant valve (34) and the fourth coolant valve (38) are opened to control the coolant to pass through the first-stage oil and gas condenser B. In this process, the first-stage oil and gas condenser B gradually cools down and frosts after the coolant absorbs heat; when the first-stage oil and gas condenser B (32) is frosted, the oil and gas valve is used to switch the flow direction, so that the high-temperature and high-pressure oil and gas at the oil and gas inlet (21) first passes through the frosted The first-stage oil and gas condenser B is defrosted, and then enters the first-stage oil and gas condenser A for cooling. In this process, the second refrigerant valve (34) and the fourth refrigerant valve (38) are closed to control the refrigerant not to pass through the first-stage oil and gas condenser B, and the first refrigerant valve (33) and the third refrigerant valve (37) are opened to control the refrigerant to pass through the first-stage oil and gas condenser A. In this process, the high-temperature and high-pressure oil and gas first defrosts the frosted first-stage oil and gas condenser B, and then enters the first-stage oil and gas condenser A for further cooling. In this way, by cyclically switching the oil and gas flow direction and the refrigerant flow direction, the cooling, frosting and defrosting cycle can be cleverly achieved, thereby effectively ensuring the normal and stable operation of the variable flow direction refrigerant circulation oil and gas recovery system.

[0021] In the present invention, the refrigerant cools down the high-temperature and high-pressure oil and gas in the first-stage oil and gas condenser and becomes a higher-temperature refrigerant. The higher-temperature refrigerant absorbs the coldness of the oil and gas tail gas at about -70°C through the four-stage oil and gas heater, cools down to become a lower-temperature refrigerant, and heats the -70°C oil and gas tail gas to about 10°C for discharge; the lower-temperature refrigerant enters the first-stage oil and gas condenser, dissipates coldness to reduce the temperature of the inlet oil and gas, absorbs the heat of the inlet oil and gas and heats up to become a higher-temperature refrigerant, and operates in a cycle; the present invention is based on the refrigerant cycle heat recovery subsystem, which can effectively recover the coldness of the oil and gas tail gas at about -70°C, and is used to replace the original compressor refrigeration to provide refrigeration for the first-stage oil and gas condenser, reduce the compressor configuration of the first-stage oil and gas condenser, and greatly improve the energy utilization rate of the oil and gas recovery unit. The variable flow refrigerant cycle oil and gas recovery system provided by the present invention has the advantages of low energy consumption, energy saving and environmental protection, simple refrigeration system, low cost, high reliability, etc., and greatly improves the energy saving and environmental protection, cost performance and operation reliability of the oil and gas recovery system.

[0022] In some embodiments, Figure 1As shown, the secondary cooling module includes a secondary oil and gas condenser A (28), a secondary oil and gas condenser B (29), a fifth oil and gas valve (210), a sixth oil and gas valve (211), and a second oil and gas connecting pipe (212); the other end of the first oil and gas connecting pipe (27) is divided into two paths, one path is connected to one end of the secondary oil and gas condenser A (28), and the other path is connected to one end of the secondary oil and gas condenser B (29); the other end of the secondary oil and gas condenser A (28) is connected to one end of the fifth oil and gas valve (210), the other end of the secondary oil and gas condenser B (29) is connected to one end of the sixth oil and gas valve (211), the other end of the fifth oil and gas valve (210) is connected to the other end of the sixth oil and gas valve (211), and is connected to one end of the second oil and gas connecting pipe (212).

[0023] In this embodiment, the high-temperature and high-pressure oil and gas are partially liquefied after being cooled by the primary cooling module, and the remaining oil and gas continue to enter the secondary cooling module through the first oil and gas connecting pipe (27) for further cooling. By controlling the switching of the fifth oil and gas valve (210) and the sixth oil and gas valve (211), the remaining oil and gas can be further cooled and liquefied through the secondary oil and gas condenser A (28) or the secondary oil and gas condenser B (29) alone. Specifically, by controlling the fifth oil and gas valve (210) to open and the sixth oil and gas valve (211) to close, the remaining oil and gas is cooled and liquefied through the secondary oil and gas condenser A (28). During this process, if it is detected that the secondary oil and gas condenser A (28) is frosted, the fifth oil and gas valve (210) is controlled to close and the sixth oil and gas valve (211) is controlled to open, so that the remaining oil and gas is cooled and liquefied through the secondary oil and gas condenser B (29). In this way, by cyclically switching the oil and gas flow direction, the cooling, frosting and defrosting cycles can be cleverly achieved, thereby effectively ensuring the normal and stable operation of the variable flow direction cold-carrying circulation oil and gas recovery system.

[0024] In some embodiments, Figure 1 As shown, the three-stage cooling module includes a three-stage oil and gas condenser A (213), a three-stage oil and gas condenser B (214), a seventh oil and gas valve (215), an eighth oil and gas valve (216), and a third oil and gas connecting pipe (217); the other end of the second oil and gas connecting pipe (212) is divided into two paths, one path is connected to one end of the three-stage oil and gas condenser A (213), and the other path is connected to one end of the three-stage oil and gas condenser B (214); the other end of the three-stage oil and gas condenser A (213) is connected to one end of the seventh oil and gas valve (215), the other end of the three-stage oil and gas condenser B (214) is connected to one end of the eighth oil and gas valve (216), the other end of the seventh oil and gas valve (215) is connected to the other end of the eighth oil and gas valve (216), and is connected to one end of the third oil and gas connecting pipe (217).

[0025] In this embodiment, the remaining oil and gas after being cooled by the secondary cooling module can enter the tertiary cooling module through the second oil and gas connecting pipe (212) for further cooling. By controlling the switching of the seventh oil and gas valve (215) and the eighth oil and gas valve (216), the remaining oil and gas can be further cooled and liquefied through the tertiary oil and gas condenser A (213) or the tertiary oil and gas condenser B (214) alone. Specifically, by controlling the seventh oil and gas valve (215) to open and the eighth oil and gas valve (216) to close, the remaining oil and gas is cooled and liquefied through the three-stage oil and gas condenser A (213). During this process, if it is detected that the three-stage oil and gas condenser A (213) is frosted, the seventh oil and gas valve (215) is controlled to close and the eighth oil and gas valve (216) is controlled to open, so that the remaining oil and gas is cooled and liquefied through the three-stage oil and gas condenser B (214). In this way, by cyclically switching the oil and gas flow direction, the cooling, frosting and defrosting cycles can be cleverly achieved, thereby effectively ensuring the normal and stable operation of the variable flow cold circulation oil and gas recovery system.

[0026] In some embodiments, Figure 1 As shown, the four-stage heating module includes a four-stage heating box (218) connected to the other end of the third oil and gas connecting pipe (217), and the other end of the four-stage heating box (218) is connected to the oil and gas outlet (219); the four-stage oil and gas heater (36) is installed in the four-stage heating box (218).

[0027] In this embodiment, the low-temperature (about -70°C) oil and gas tail gas cooled by the three-stage cooling module enters the four-stage heating box (218) equipped with the four-stage oil and gas heater (36) through the third oil and gas connecting pipe (217). At this time, since the refrigerant cools the high-temperature and high-pressure oil and gas in the first-stage oil and gas condenser to become a higher-temperature refrigerant, the higher-temperature refrigerant can absorb the cold of the oil and gas tail gas of about -70°C through the four-stage oil and gas heater, cool down to become a lower-temperature refrigerant, and heat the -70°C oil and gas tail gas. The oil and gas exhaust gas is discharged at about 10°C; the relatively low-temperature refrigerant enters the primary oil and gas condenser, dissipates the cold energy to reduce the temperature of the inlet oil and gas, absorbs the heat of the inlet oil and gas to heat up to become a relatively high-temperature refrigerant, and operates in this cycle; this embodiment is based on the refrigeration cycle heat recovery subsystem, which can effectively recover the cold energy of the oil and gas exhaust gas at about -70°C, and is used to replace the original compressor refrigeration to provide refrigeration capacity for the primary oil and gas condenser, reduce the compressor configuration of the primary oil and gas condenser, and greatly improve the energy utilization rate of the oil and gas recovery unit.

[0028] In some embodiments, Figure 1As shown, it also includes a liquid oil outlet pipe (220), and the liquid oil outlet of the first-stage cooling box (24), the liquid oil outlet of the second-stage oil-gas condenser A (28), the liquid oil outlet of the second-stage oil-gas condenser B (29), the liquid oil outlet of the third-stage oil-gas condenser A (213), and the liquid oil outlet of the third-stage oil-gas condenser B (214) are all connected to the liquid oil outlet pipe (220).

[0029] In this embodiment, during the cooling process of the high-temperature and high-pressure oil and gas at different stages, the volatile organic matter therein is condensed and liquefied and then recovered through the liquid oil outlet pipe (220).

[0030] In summary, the present invention uses the higher temperature refrigerant from the first-stage oil and gas condenser in the refrigeration cycle heat recovery subsystem, absorbs the cold of the oil and gas tail gas at about -70°C through the four-stage oil and gas heater, cools it down to become a lower temperature refrigerant, and heats the -70°C oil and gas tail gas to about 10°C for discharge; the lower temperature refrigerant enters the first-stage oil and gas condenser, dissipates the cold to reduce the temperature of the imported oil and gas, absorbs the heat of the imported oil and gas to heat up to become a higher temperature refrigerant, and operates in this cycle; based on the refrigeration cycle heat recovery subsystem, the present invention can effectively recover the cold of the oil and gas tail gas at about -70°C, which is used to replace the original compressor refrigeration to provide refrigeration for the first-stage oil and gas condenser, reduce the compressor configuration of the first-stage oil and gas condenser, and greatly improve the energy utilization rate of the oil and gas recovery unit. The variable flow refrigeration cycle oil and gas recovery system provided by the present invention has the advantages of low energy consumption, energy saving and environmental protection, simple refrigeration system, low cost, high reliability, etc., which greatly improves the energy saving and environmental protection, cost performance and operation reliability of the oil and gas recovery system.

[0031] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all these changes or substitutions should fall within the protection scope of the present invention.

Claims

1. A variable flow cooling circulation oil and gas recovery system, characterized in that: include: Variable flow oil and gas cooling liquefaction recovery subsystem and carrier cooling cycle heat recovery subsystem; The variable flow direction oil and gas cooling liquefaction recovery subsystem comprises a primary cooling module, a secondary cooling module, a tertiary cooling module, and a quaternary heating module which are sequentially connected through an oil and gas connecting pipe; wherein the primary cooling module comprises: an oil and gas inlet (21), a first oil and gas valve (22), a second oil and gas valve (23), a primary cooling box (24), a third oil and gas valve (25), a fourth oil and gas valve (26), and a first oil and gas connecting pipe (27); the oil and gas inlet (21) is divided into two paths, one of which is connected to one end of the first oil and gas valve (22), and the other is connected to the first oil and gas valve (23). One end of the first oil and gas valve (22) is connected to one end of the second oil and gas valve (23), the other end of the first oil and gas valve (22) is connected to the inlet of the first cooling box (24), and the other end of the second oil and gas valve (23) is connected to the outlet of the first cooling box (24); the inlet of the first cooling box (24) is also connected to one end of the fourth oil and gas valve (26), the outlet of the first cooling box (24) is also connected to one end of the third oil and gas valve (25), the other end of the third oil and gas valve (25) is connected to the other end of the fourth oil and gas valve (26), and is connected to one end of the first oil and gas connecting pipe (27); The secondary cooling cycle heat recovery subsystem comprises: a primary oil-gas condenser A (31) and a primary oil-gas condenser B (32), a first secondary cooling agent valve (33), a second secondary cooling agent valve (34), a secondary cooling agent pump (35), a fourth oil-gas heater (36), a third secondary cooling agent valve (37), and a fourth secondary cooling agent valve (38); the primary oil-gas condenser A (31) and the primary oil-gas condenser B (32) are placed side by side and are both installed in the primary cooling box (24), and the primary oil-gas condenser (A) is adjacent to the inlet of the primary cooling box (24), and the primary oil-gas condenser B (32) is adjacent to the outlet of the primary cooling box (24); the secondary cooling agent outlet of the primary oil-gas condenser A (31) is adjacent to the first secondary cooling agent valve (33). The first oil-gas condenser B (32) is connected to one end of the second refrigerant valve (34); the other end of the first refrigerant valve (33) is connected to the other end of the second refrigerant valve (34), and then connected to one end of a refrigerant pump (35); the other end of the refrigerant pump (35) is connected to the refrigerant inlet of the fourth oil-gas heater (36); the refrigerant outlet of the fourth oil-gas heater (36) is divided into two paths, one of which is connected to one end of the third refrigerant valve (37) and the other is connected to one end of the fourth refrigerant valve (38); the other end of the third refrigerant valve (37) is connected to the refrigerant inlet of the first oil-gas condenser A (31), and the other end of the fourth refrigerant valve (38) is connected to the refrigerant inlet of the first oil-gas condenser B (32).

2. The variable flow direction cooling circulation oil and gas recovery system according to claim 1 is characterized in that: The secondary cooling module comprises a secondary oil and gas condenser A (28), a secondary oil and gas condenser B (29), a fifth oil and gas valve (210), a sixth oil and gas valve (211), and a second oil and gas connecting pipe (212); the other end of the first oil and gas connecting pipe (27) is divided into two paths, one path is connected to one end of the secondary oil and gas condenser A (28), and the other path is connected to one end of the secondary oil and gas condenser B (29); the other end of the secondary oil and gas condenser A (28) is connected to one end of the fifth oil and gas valve (210), the other end of the secondary oil and gas condenser B (29) is connected to one end of the sixth oil and gas valve (211), the other end of the fifth oil and gas valve (210) is connected to the other end of the sixth oil and gas valve (211), and is connected to one end of the second oil and gas connecting pipe (212).

3. The variable flow direction cooling circulation oil and gas recovery system according to claim 2 is characterized in that: The three-stage cooling module comprises a three-stage oil and gas condenser A (213), a three-stage oil and gas condenser B (214), a seventh oil and gas valve (215), an eighth oil and gas valve (216), and a third oil and gas connecting pipe (217); the other end of the second oil and gas connecting pipe (212) is divided into two paths, one path is connected to one end of the three-stage oil and gas condenser A (213), and the other path is connected to one end of the three-stage oil and gas condenser B (214); the other end of the three-stage oil and gas condenser A (213) is connected to one end of the seventh oil and gas valve (215), the other end of the three-stage oil and gas condenser B (214) is connected to one end of the eighth oil and gas valve (216), the other end of the seventh oil and gas valve (215) is connected to the other end of the eighth oil and gas valve (216), and is connected to one end of the third oil and gas connecting pipe (217).

4. The variable flow direction cooling circulation oil and gas recovery system according to claim 3 is characterized in that: The four-stage heating module comprises a four-stage heating box (218) connected to the other end of the third oil and gas connecting pipe (217), and the other end of the four-stage heating box (218) is connected to an oil and gas outlet (219); the four-stage oil and gas heater (36) is installed in the four-stage heating box (218).

5. The variable flow direction cooling circulation oil and gas recovery system according to claim 1 is characterized in that: It also includes a liquid oil outlet pipe (220), and the liquid oil outlet of the first-stage cooling box (24), the liquid oil outlet of the second-stage oil-gas condenser A (28), the liquid oil outlet of the second-stage oil-gas condenser B (29), the liquid oil outlet of the third-stage oil-gas condenser A (213), and the liquid oil outlet of the third-stage oil-gas condenser B (214) are all connected to the liquid oil outlet pipe (220).

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