Variable flow direction liquid subcooling cycle oil and gas recovery system

Abstract

The present application relates to oil and gas recovery technical field, disclose a kind of variable flow direction cold carrier circulation oil and gas recovery system, comprising: variable flow direction oil and gas cooling liquefied recovery subsystem and cold carrier circulation heat recovery subsystem;The variable flow direction oil and gas cooling liquefied recovery subsystem includes sequentially communicated first-stage cooling module, second-stage cooling module, third-stage cooling module and fourth-stage heating module by oil and gas connecting pipe;The cold carrier circulation heat recovery subsystem includes: first-stage oil and gas condenser A, first-stage oil and gas condenser B, first cold carrier valve, second cold carrier valve, cold carrier pump, fourth-stage oil and gas heater, third cold carrier valve and fourth cold carrier valve.The variable flow direction cold carrier circulation oil and gas recovery system provided by the present application has the advantages of low energy consumption, energy saving and environmental protection, simple refrigeration system, low cost, high reliability and other advantages, which greatly improves the energy saving and environmental protection of oil and gas recovery system, cost performance and operation reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas recovery, in particular to a variable flow direction cold carrier circulation oil and gas recovery system. BACKGROUND

[0002] At present, there is an ordinary oil and gas recovery system, which can be used for multi-stage deep cooling, and the lowest cooling temperature can reach about-70 DEG C. The system is used for condensation and liquefaction recovery of volatile organic compounds in oil and gas (VOCs gas), reduces environmental pollution, and the recovered volatile organic compounds can also produce considerable economic benefits.

[0003] However, after the ordinary oil and gas recovery system cools the imported oil and gas in multiple stages, the oil and gas is cooled to-70 DEG C. The-70 DEG C oil and gas tail gas after cooling and recovery is generally directly discharged into the atmosphere, or a heating device is additionally provided to heat the low-temperature oil and gas to about 10 DEG C before discharging it into the atmosphere. However, the-70 DEG C oil and gas tail gas at the outlet of the last-stage variable flow direction cold carrier circulation oil and gas recovery system has a lot of high-grade refrigeration capacity, which is wasted and discharged into the atmosphere or set to consume energy to heat the low-temperature oil and gas before discharging. This way makes the traditional oil and gas recovery system have problems such as high energy consumption, serious pollution, complex refrigeration system, high cost, low reliability and the like, which seriously limits the development of oil and gas condensation equipment.

[0004] Therefore, the prior art still needs to be improved and improved. SUMMARY

[0005] In view of the above problems of the prior art, the present application aims to provide a variable flow direction cold carrier circulation oil and gas recovery system, which aims to solve the problems of high energy consumption, serious pollution, complex refrigeration system, high cost and low reliability of the traditional oil and gas recovery system.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0007] The application discloses a variable flow direction oil gas cooling and liquefying recovery system, which comprises a variable flow direction oil gas cooling and liquefying recovery subsystem and a cooling cycle heat recovery subsystem, wherein the variable flow direction oil gas cooling and liquefying recovery 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 connected through an oil gas connecting pipe; the first-stage cooling module comprises an oil gas inlet (21), a first oil gas valve (22), a second oil gas valve (23), a first-stage cooling tank (24), a third oil gas valve (25), a fourth oil gas valve (26) and a first oil gas connecting pipe (27); the oil gas inlet (21) is divided into two paths, one of which is connected with one end of the first oil gas valve (22), and the other of which is connected with one end of the second oil gas valve (23); the other end of the first oil gas valve (22) is connected with an inlet of the first-stage cooling tank (24), and the other end of the second oil gas valve (23) is connected with an outlet of the first-stage cooling tank (24); the inlet of the first-stage cooling tank (24) is further connected with one end of the fourth oil gas valve (26), and the outlet of the first-stage cooling tank (24) is further connected with one end of the third oil gas valve (25); the other end of the third oil gas valve (25) is connected with the other end of the fourth oil gas valve (26) and one end of the first oil gas connecting pipe (27); the cooling cycle heat recovery subsystem comprises a first-stage oil gas condenser A (31), a first-stage oil gas condenser B (32), a first cooling medium valve (33), a second cooling medium valve (34), a cooling medium pump (35), a fourth-stage oil gas heater (36), a third cooling medium valve (37) and a fourth cooling medium valve (38); the first-stage oil gas condenser A (31) and the first-stage oil gas condenser B (32) are arranged side by side and installed in the first-stage cooling tank (24); the first-stage oil gas condenser A (31) is adjacent to the inlet of the first-stage cooling tank (24), and the first-stage oil gas condenser B (32) is adjacent to the outlet of the first-stage cooling tank (24); the cooling medium outlet of the first-stage oil gas condenser A (31) is connected with one end of the first cooling medium valve (33); the cooling medium outlet of the first-stage oil gas condenser B (32) is connected with one end of the second cooling medium valve (34); the other end of the first cooling medium valve (33) is connected with the other end of the second cooling medium valve (34) and then connected with one end of the cooling medium pump (35); the other end of the cooling medium pump (35) is connected with the cooling medium inlet of the fourth-stage oil gas heater (36); the cooling medium outlet of the fourth-stage oil gas heater (36) is divided into two paths, one of which is connected with one end of the third cooling medium valve (37), and the other of which is connected with one end of the fourth cooling medium valve (38); the other end of the third cooling medium valve (37) is connected with the cooling medium inlet of the first-stage oil gas condenser A (31), and the other end of the fourth cooling medium valve (38) is connected with the cooling medium inlet of the first-stage oil gas condenser B (32).

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

[0009] The variable flow direction cold carrier cycle oil gas recovery system, wherein the secondary cooling module comprises a secondary oil gas condenser A (28), a secondary oil gas condenser B (29), a fifth oil gas valve (210), a sixth oil gas valve (211), and a second oil gas connecting pipe (212); the other end of the first oil gas connecting pipe (27) is divided into two paths, one of which is connected with one end of the secondary oil gas condenser A (28), and the other of which is connected with one end of the secondary oil gas condenser B (29); the other end of the secondary oil gas condenser A (28) is connected with one end of the fifth oil gas valve (210), the other end of the secondary oil gas condenser B (29) is connected with one end of the sixth oil gas valve (211), the other end of the fifth oil gas valve (210) is connected with the other end of the sixth oil gas valve (211), and one end of the second oil gas connecting pipe (212) is connected.

[0010] The variable flow direction cold carrier cycle oil gas recovery system, wherein the secondary cooling module comprises a secondary oil gas condenser A (28), a secondary oil gas condenser B (29), a fifth oil gas valve (210), a sixth oil gas valve (211), and a second oil gas connecting pipe (212); the other end of the first oil gas connecting pipe (27) is divided into two paths, one of which is connected with one end of the secondary oil gas condenser A (28), and the other of which is connected with one end of the secondary oil gas condenser B (29); the other end of the secondary oil gas condenser A (28) is connected with one end of the fifth oil gas valve (210), the other end of the secondary oil gas condenser B (29) is connected with one end of the sixth oil gas valve (211), the other end of the fifth oil gas valve (210) is connected with the other end of the sixth oil gas valve (211), and one end of the second oil gas connecting pipe (212) is connected.

[0011] The variable flow direction cold carrier cycle oil gas recovery system, wherein the secondary cooling module comprises a secondary oil gas condenser A (28), a secondary oil gas condenser B (29), a fifth oil gas valve (210), a sixth oil gas valve (211), and a second oil gas connecting pipe (212); the other end of the first oil gas connecting pipe (27) is divided into two paths, one of which is connected with one end of the secondary oil gas condenser A (28), and the other of which is connected with one end of the secondary oil gas condenser B (29); the other end of the secondary oil gas condenser A (28) is connected with one end of the fifth oil gas valve (210), the other end of the secondary oil gas condenser B (29) is connected with one end of the sixth oil gas valve (211), the other end of the fifth oil gas valve (210) is connected with the other end of the sixth oil gas valve (211), and one end of the second oil gas connecting pipe (212) is connected.

[0012] Beneficial effects:

[0013] The application provides a variable flow direction cold carrier circulation oil gas recovery system, which adopts high-temperature cold carrier from a first oil gas condenser in a cold carrier circulation heat recovery subsystem, absorbs the cold quantity of oil gas tail gas at about-70 DEG C through a fourth oil gas heater to become low-temperature cold carrier, and heats the-70 DEG C oil gas tail gas to about 10 DEG C for discharge; the low-temperature cold carrier enters the first oil gas condenser to release cold quantity for reducing the temperature of imported oil gas, absorbs the heat of the imported oil gas to become high-temperature cold carrier, and the cycle operation is realized; based on the cold carrier circulation heat recovery subsystem, the cold quantity of the oil gas tail gas at about-70 DEG C can be effectively recovered to replace the compressor refrigeration for providing refrigeration quantity for the first oil gas condenser, the compressor configuration of the first oil gas condenser is reduced, and the energy utilization rate of the oil gas recovery unit is greatly improved. The variable flow direction cold carrier circulation oil gas recovery system has the advantages of low energy consumption, energy saving and environmental protection, simple refrigeration system, low cost, high reliability and the like, and the energy saving and environmental protection performance, cost performance and operation reliability of the oil gas recovery system are greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The application provides a structure diagram of the variable flow direction cold carrier circulation oil gas recovery system.

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

[0016] The application provides a variable flow direction cold carrier circulation oil gas recovery system, for the purpose, technical scheme and effect of the application are more clear and definite, the following refers to the drawings and takes examples to make further detailed description of the application.

[0017] In the description of the present application, it should be understood that the terms "top", "bottom" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and cannot be understood as a limitation on the present application; in addition, the terms "mounting", "connecting" and the like should be understood broadly, and for those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0018] In the traditional oil gas recovery system, the oil gas tail gas at about-70℃ after multi-stage cooling of the imported oil gas is discharged into the atmosphere or even needs to consume energy for heating the low-temperature oil gas before being discharged, and the high-grade refrigeration capacity of the-70℃ oil gas tail gas cannot be effectively recovered and utilized, resulting in the problems of high energy consumption, serious pollution, complex refrigeration system, high cost and low reliability of the traditional oil gas recovery system.

[0019] In order to solve the problems of the traditional oil gas recovery system, the present application provides a variable flow direction chilled carrier circulation oil gas recovery system, such as Figure 1As shown, it comprises: a variable flow direction oil gas cooling liquefaction recovery subsystem and a cold carrier circulation heat recovery subsystem; the variable flow direction oil gas cooling liquefaction recovery 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 an oil gas connecting pipe; wherein the first-stage cooling module comprises: an oil gas inlet (21), a first oil gas valve (22), a second oil gas valve (23), a first-stage cooling tank (24), a third oil gas valve (25), a fourth oil gas valve (26) and a first oil gas connecting pipe (27); the oil gas inlet (21) is divided into two paths, one path is connected with one end of the first oil gas valve (22), and the other path is connected with one end of the second oil gas valve (23), the other end of the first oil gas valve (22) is connected with an inlet of the first-stage cooling tank (24), and the other end of the second oil gas valve (23) is connected with an outlet of the first-stage cooling tank (24); the inlet of the first-stage cooling tank (24) is further connected with one end of the fourth oil gas valve (26), and the outlet of the first-stage cooling tank (24) is further connected with one end of the third oil gas valve (25), the other end of the third oil gas valve (25) is connected with the other end of the fourth oil gas valve (26), and the other end of the fourth oil gas valve (26) is connected with one end of the first oil gas connecting pipe (27); the cold carrier circulation heat recovery subsystem comprises: a first-stage oil gas condenser A (31) and a first-stage oil gas condenser B (32), a first cold carrier valve (33), a second cold carrier valve (34), a cold carrier pump (35), a fourth-stage oil gas heater (36), a third cold carrier valve (37) and a fourth cold carrier 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 tank (24), and the first-stage oil gas condenser A (31) is adjacent to the inlet of the first-stage cooling tank (24), and the first-stage oil gas condenser B (32) is adjacent to the outlet of the first-stage cooling tank (24); the cold carrier outlet of the first-stage oil gas condenser A (31) is connected with one end of the first cold carrier valve (33); the cold carrier outlet of the first-stage oil gas condenser B (32) is connected with one end of the second cold carrier valve (34); the other end of the first cold carrier valve (33) is connected with the other end of the second cold carrier valve (34), and then is connected with one end of the cold carrier pump (35), and the other end of the cold carrier pump (35) is connected with the cold carrier inlet of the fourth-stage oil gas heater (36); the cold carrier outlet of the fourth-stage oil gas heater (36) is divided into two paths, one path is connected with one end of the third cold carrier valve (37), and the other path is connected with one end of the fourth cold carrier valve (38), the other end of the third cold carrier valve (37) is connected with the cold carrier inlet of the first-stage oil gas condenser A (31), and the other end of the fourth cold carrier valve (38) is connected with the cold carrier inlet of the first-stage oil gas condenser B (32).

[0020] In the present application, the external high-temperature oil gas is pressurized by the fan to become high-temperature high-pressure oil gas, which first enters the first-stage oil gas condenser A (31) and then enters the first-stage oil gas condenser B (32) to be cooled down. At this time, the cooling agent is controlled not to pass through the first-stage oil gas condenser A by closing the first cooling agent valve (33) and the third cooling agent valve (37), and the cooling agent is controlled to pass through the first-stage oil gas condenser B by opening the second cooling agent valve (34) and the fourth cooling agent valve (38). In this process, the first-stage oil gas condenser B gradually cools down and frosts after absorbing heat from the cooling agent. When the first-stage oil gas condenser B (32) frosts, the oil gas valve is used to switch the flow direction, so that the high-temperature high-pressure oil gas from the oil gas inlet (21) first passes through the frosted first-stage oil gas condenser B to defrost, and then enters the first-stage oil gas condenser A to be cooled down. In this process, the cooling agent is controlled not to pass through the first-stage oil gas condenser B by closing the second cooling agent valve (34) and the fourth cooling agent valve (38), and the cooling agent is controlled to pass through the first-stage oil gas condenser A by opening the first cooling agent valve (33) and the third cooling agent valve (37). In this process, the high-temperature high-pressure oil gas is first used to defrost the frosted first-stage oil gas condenser B, and then enters the first-stage oil gas condenser A for further cooling down. By cyclically switching the oil gas flow direction and the cooling agent flow direction, the cooling, frosting and defrosting cycle is achieved, thereby effectively ensuring the normal and stable operation of the variable flow direction cooling cycle oil gas recovery system.

[0021] In the present application, the cooling agent is cooled down to become a higher-temperature cooling agent after absorbing heat from the high-temperature high-pressure oil gas in the first-stage oil gas condenser. The higher-temperature cooling agent is cooled down to become a lower-temperature cooling agent by absorbing the cold energy of the oil gas tail gas at about -70°C through the fourth oil gas heater, and the -70°C oil gas tail gas is heated to about 10°C for discharge. The lower-temperature cooling agent enters the first-stage oil gas condenser to release cold energy for reducing the temperature of the imported oil gas, absorbs heat from the imported oil gas to become a higher-temperature cooling agent, and so on. Based on the cooling cycle heat recovery subsystem, the cold energy of the oil gas tail gas at about -70°C can be effectively recovered to replace the compressor refrigeration for providing refrigeration capacity for the first-stage oil gas condenser, thereby reducing the configuration of the compressor of the first-stage oil gas condenser and greatly improving the energy utilization rate of the oil gas recovery unit. The variable flow direction cooling cycle oil gas recovery system provided by the present application has the advantages of low energy consumption, energy saving and environmental protection, simple refrigeration system, low cost, high reliability and the like, and greatly improves the energy saving and environmental protection, cost performance and operation reliability of the oil gas recovery system.

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

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

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

[0025] In the embodiment, the remaining oil gas cooled by the second cooling module can enter the third cooling module for further cooling through the second oil gas connecting pipe (212), and the further cooling and liquefaction of the remaining oil gas through the third oil gas condenser A (213) or the third oil gas condenser B (214) can be realized by controlling the opening and closing of the seventh oil gas valve (215) and the eighth oil gas valve (216). Specifically, by controlling the seventh oil gas valve (215) to be opened and the eighth oil gas valve (216) to be closed, the remaining oil gas is cooled and liquefied through the third oil gas condenser A (213), and in this process, if frost is monitored on the third oil gas condenser A (213), the seventh oil gas valve (215) is controlled to be closed and the eighth oil gas valve (216) is controlled to be opened, so that the remaining oil gas is cooled and liquefied through the third oil gas condenser B (214). By cyclically switching the oil gas flow direction, cooling, frosting and defrosting cycles can be realized, thereby effectively ensuring the normal and stable operation of the variable flow direction cold-carrying cycle oil gas recovery system.

[0026] In some embodiments, as shown in Figure 1 The fourth temperature increasing module includes a fourth temperature increasing tank (218) connected to the other end of the third oil gas connecting pipe (217), and an oil gas outlet (219) connected to the other end of the fourth temperature increasing tank (218). The fourth oil gas heater (36) is installed in the fourth temperature increasing tank (218).

[0027] In the embodiment, the low-temperature (-70°C or so) oil gas tail gas cooled by the third cooling module enters the fourth temperature increasing tank (218) installed with the fourth oil gas heater (36) through the third oil gas connecting pipe (217). At this time, since the cold carrier becomes a higher-temperature cold carrier after cooling the high-temperature and high-pressure oil gas in the first oil gas condenser, the higher-temperature cold carrier can absorb the cold energy of the -70°C or so oil gas tail gas through the fourth oil gas heater, become a lower-temperature cold carrier, and heat the -70°C oil gas tail gas to about 10°C for discharge. The lower-temperature cold carrier enters the first oil gas condenser to release cold energy for reducing the temperature of the imported oil gas, absorbs the heat of the imported oil gas to become a higher-temperature cold carrier, and so on. Based on the cold-carrying cycle heat recovery subsystem, the cold energy of the -70°C or so oil gas tail gas can be effectively recovered to replace the compressor refrigeration for providing refrigeration capacity for the first oil gas condenser, reduce the configuration of the compressor of the first oil gas condenser, and greatly improve the energy utilization rate of the oil gas recovery unit.

[0028] In some embodiments, as shown in Figure 1As shown, the oil recovery system further comprises a liquid oil outlet pipe (220) connected with the liquid oil outlet of the first-stage cooling tank (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).

[0029] In the embodiment, the volatile organic compounds in the high-temperature and high-pressure oil gas are condensed and liquefied in the cooling process at different stages, and then recovered through the liquid oil outlet pipe (220).

[0030] In summary, the present application uses the higher-temperature cooling medium from the first-stage oil gas condenser in the cooling cycle heat recovery subsystem to absorb the cold energy of the oil gas tail gas at about -70 DEG C through the four-stage oil gas heater, and the cooling medium is cooled to become lower-temperature cooling medium, and the -70 DEG C oil gas tail gas is heated to about 10 DEG C for discharge; the lower-temperature cooling medium enters the first-stage oil gas condenser to release cold energy for reducing the temperature of the imported oil gas, and absorbs the heat of the imported oil gas to become higher-temperature cooling medium, and the cycle is repeated; the present application is based on the cooling cycle heat recovery subsystem, and can effectively recover the cold energy of the oil gas tail gas at about -70 DEG C to replace the compressor refrigeration for providing refrigeration capacity for the first-stage oil gas condenser, and reduce the compressor configuration of the first-stage oil gas condenser, and greatly improve the energy utilization rate of the oil gas recovery unit. The variable flow direction cooling cycle oil gas recovery system provided by the present application has the advantages of low energy consumption, energy saving and environmental protection, simple refrigeration system, low cost, high reliability, and the like, and greatly improves the energy saving and environmental protection, cost performance, and operation reliability of the oil gas recovery system.

[0031] It can be understood that, for those skilled in the art, equivalent replacements or changes can be made according to the technical solutions and inventive concept of the present application, and all the changes or replacements shall belong to the protection scope of the present application.

Claims

1. A variable flow direction chilled carrier cycle oil and gas recovery system, characterized by, Comprise: Variable flow direction oil gas cooling liquefied recovery subsystem and cold carrier circulation heat recovery subsystem; The variable flow direction oil gas cooling liquefied recovery subsystem comprises a primary cooling module, a secondary cooling module, a tertiary cooling module and a quaternary warming module communicated in sequence through an oil gas connecting pipe; wherein the primary cooling module comprises an oil gas inlet (21), a first oil gas valve (22), a second oil gas valve (23), a primary cooling tank (24), a third oil gas valve (25), a fourth oil gas valve (26) and a first oil gas connecting pipe (27); the oil gas inlet (21) is divided into two paths, one path is connected with one end of the first oil gas valve (22), and the other path is connected with one end of the second oil gas valve (23), the other end of the first oil gas valve (22) is connected with an inlet of the primary cooling tank (24), and the other end of the second oil gas valve (23) is connected with an outlet of the primary cooling tank (24); the inlet of the primary cooling tank (24) is also connected with one end of the fourth oil gas valve (26), and the outlet of the primary cooling tank (24) is also connected with one end of the third oil gas valve (25), the other end of the third oil gas valve (25) is connected with the other end of the fourth oil gas valve (26), and the other end of the fourth oil gas valve (26) is connected with one end of the first oil gas connecting pipe (27); The cold-carrying circulating heat recovery subsystem comprises: a first oil-gas condenser A (31) and a first oil-gas condenser B (32), a first cold-carrying agent valve (33), a second cold-carrying agent valve (34), a cold-carrying agent pump (35), a fourth oil-gas heater (36), a third cold-carrying agent valve (37), and a fourth cold-carrying agent valve (38); the first oil-gas condenser A (31) and the first oil-gas condenser B (32) are placed side by side and are both installed in the first cooling box (24), and the first oil-gas condenser A is adjacent to the inlet of the first cooling box (24), and the first oil-gas condenser B (32) is adjacent to the outlet of the first cooling box (24); the cold-carrying agent outlet of the first oil-gas condenser A (31) is connected with one end of the first cold-carrying agent valve (33); the cold-carrying agent outlet of the first oil-gas condenser B (32) is connected with one end of the second cold-carrying agent valve (34); the other end of the first cold-carrying agent valve (33) is connected with the other end of the second cold-carrying agent valve (34), and then is connected with one end of the cold-carrying agent pump (35), and the other end of the cold-carrying agent pump (35) is connected with the cold-carrying agent inlet of the fourth oil-gas heater (36); the cold-carrying agent outlet of the fourth oil-gas heater (36) is divided into two paths, one path is connected with one end of the third cold-carrying agent valve (37), and the other path is connected with one end of the fourth cold-carrying agent valve (38), the other end of the third cold-carrying agent valve (37) is connected with the cold-carrying agent inlet of the first oil-gas condenser A (31), and the other end of the fourth cold-carrying agent valve (38) is connected with the cold-carrying agent inlet of the first oil-gas condenser B (32); the second cooling module comprises a second oil-gas condenser A (28), a second oil-gas condenser B (29), a fifth oil-gas valve (210), a sixth oil-gas valve (211), and a second oil-gas connecting pipe (212); the other end of the first oil-gas connecting pipe (27) is divided into two paths, one path is connected with one end of the second oil-gas condenser A (28), and the other path is connected with one end of the second oil-gas condenser B (29); the other end of the second oil-gas condenser A (28) is connected with one end of the fifth oil-gas valve (210), the other end of the second oil-gas condenser B (29) is connected with one end of the sixth oil-gas valve (211), the other end of the fifth oil-gas valve (210) is connected with the other end of the sixth oil-gas valve (211), and is connected with one end of the second oil-gas connecting pipe (212); the third cooling module comprises a third oil-gas condenser A (213), a third oil-gas condenser B (214), a seventh oil-gas valve (215), an eighth oil-gas valve (216), and a third oil-gas connecting pipe (217); the other end of the second oil-gas connecting pipe (212) is divided into two paths, one path is connected with one end of the third oil-gas condenser A (213), and the other path is connected with one end of the third oil-gas condenser B (214).The other end of the third oil-gas condenser A (213) is connected with one end of the seventh oil-gas valve (215), the other end of the third oil-gas condenser B (214) is connected with one end of the eighth oil-gas valve (216), the other end of the seventh oil-gas valve (215) is connected with the other end of the eighth oil-gas valve (216), and one end of the third oil-gas connecting pipe (217) is connected with the other end of the third oil-gas connecting pipe (217); the fourth temperature rising module comprises a fourth temperature rising box (218) connected with the other end of the third oil-gas connecting pipe (217), and the other end of the fourth temperature rising box (218) is connected with an oil-gas outlet (219); the fourth oil-gas heater (36) is installed in the fourth temperature rising box (218).

2. The variable flow direction chilled liquid cycle oil gas recovery system of claim 1, wherein, Further comprising a liquid oil outlet pipe (220), the liquid oil outlet of the primary cooling tank (24), the liquid oil outlet of the secondary oil gas condenser A (28), the liquid oil outlet of the secondary oil gas condenser B (29), the liquid oil outlet of the tertiary oil gas condenser A (213) and the liquid oil outlet of the tertiary oil gas condenser B (214) are all connected with the liquid oil outlet pipe (220).

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