Intelligent device for combustible gas recovery of oil storage tank top

Abstract

The application discloses an intelligent device for combustible gas recovery of an oil storage tank top, and belongs to the field of gas recovery devices.The device comprises an oil storage tank, a first dehydration tank, a cooling assembly, a second dehydration tank, a filter, an oil-gas separation mechanism and first and second sewage discharge mechanisms.The combustible gas volatilized from the top of the oil storage tank is transported to the first dehydration tank through a pipeline, the combustible gas is dehydrated in the first dehydration tank, the dehydrated combustible gas is cooled in the cooling assembly, the cooled combustible gas is dehydrated in the second dehydration tank to discharge natural gas, the natural gas is filtered in the filter, the filtered natural gas is pressurized in the oil-gas separation mechanism connected with an external recovery pipeline network, the first sewage discharge mechanism connected with the first dehydration tank is used for discharging sewage discharged from the first dehydration tank, and the second sewage discharge mechanism connected with the second dehydration tank is used for discharging sewage discharged from the second dehydration tank.The application can improve the recovery efficiency of the combustible gas on the top of the oil storage tank and effectively manage the sewage generated in the dehydration process.

Description

Technical Field

[0001] This invention relates to a gas recovery device, specifically an intelligent device for recovering combustible gases from the top of an oil storage tank. Background Technology

[0002] Oil storage tanks are containers for storing oil products and are the main facilities of oil depots. In pipeline transportation, they serve as the oil source interface for oil pipelines. Based on their architectural features, they can be divided into above-ground oil tanks, underground oil tanks, and cavern oil tanks. When oil is stored in tanks, over time, a small portion of the oil evaporates into flammable gases. These flammable gases can not only cause excessive pressure in the tank, leading to danger, but also increase oil loss and waste energy. Therefore, there is a need to develop a device that can recover and reuse the gases at the top of the oil storage tank.

[0003] Existing combustible gas recovery devices have low recovery efficiency, and the wastewater generated during the dehydration process is not well managed. Therefore, those skilled in the art have provided an intelligent device for combustible gas recovery from the top of oil storage tanks to solve the problems mentioned in the background art. Summary of the Invention

[0004] The purpose of this invention is to provide an intelligent device for recovering combustible gases from the top of oil storage tanks, which can improve the recovery efficiency of combustible gases from the top of oil storage tanks and effectively manage the wastewater generated during the dehydration process, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A smart device for recovering combustible gases from the top of an oil storage tank, comprising:

[0007] An oil storage tank, connected to a first dehydration tank, is used to transport the flammable gas volatilized from the top of the oil storage tank to the first dehydration tank via a pipeline;

[0008] The first dehydration tank, connected to the cooling assembly, is used to dehydrate the combustible gas;

[0009] A cooling assembly, connected to a second dehydration tank, is used to cool the dehydrated combustible gas;

[0010] The second dehydration tank, connected to the filter, is used to dehydrate the cooled combustible gas and remove the natural gas from the combustible gas.

[0011] A filter, connected to an oil-gas separation unit, is used to filter natural gas;

[0012] The oil-gas separation unit is connected to the external recovery pipeline network. It is used to pressurize the filtered natural gas and transport the pressurized natural gas to the external recovery pipeline network through pipelines.

[0013] The solenoid valve is installed between the external recovery pipeline and the oil storage tank. It is used to open when the pressure inside the oil storage tank drops to a threshold value, so that natural gas can be returned to the oil storage tank.

[0014] The first sewage discharge mechanism is connected to the first dewatering tank and is used to discharge the sewage discharged from the first dewatering tank.

[0015] The second sewage discharge mechanism, connected to the second dewatering tank, is used to discharge the sewage discharged from the second dewatering tank.

[0016] This application can improve the recovery efficiency of combustible gases from the top of oil storage tanks and effectively manage the wastewater generated during the dehydration process.

[0017] As a further aspect of the present invention: the oil-gas separation mechanism specifically includes: an oil-gas separation cylinder, a screw compressor, a cooling system, and a motor. The oil-gas separation cylinder is connected to a filter for receiving filtered natural gas. The screw compressor is located inside the oil-gas separation cylinder for pressurizing the incoming natural gas. The output end of the motor is connected to the screw compressor for driving the screw compressor to operate. The cooling system is used to cool the pressurized natural gas and the high-temperature lubricating oil generated during the operation of the screw compressor.

[0018] As a further embodiment of the present invention: the cooling system specifically includes: a radiator and an axial fan, the radiator being connected to an oil-gas separator to absorb heat from natural gas and lubricating oil, and the axial fan being located on one side of the radiator to blow away the heat absorbed by the radiator to achieve cooling.

[0019] As a further embodiment of the present invention: the cooling assembly specifically includes: an evaporator, a cooler, and a refrigeration unit. The evaporator is connected to a first dehydration tank and is used to cool the dehydrated combustible gas and transport the cooled combustible gas to a second dehydration tank. The refrigeration unit is connected to the evaporator and is used to return the refrigerant that has absorbed heat in the evaporator to the cooler. The cooler is connected to the refrigeration unit and is used to cool the returned refrigerant with heat and transport the cooled refrigerant to the evaporator to continue cooling the combustible gas. An expansion valve is connected between the evaporator and the cooler to throttle and reduce the pressure of the refrigerant output by the cooler.

[0020] As a further embodiment of the present invention: the first sewage discharge mechanism specifically includes: a first sewage discharge shut-off valve and a first electric valve. The bottom output end of the first dehydration tank is connected to the first sewage discharge shut-off valve and the first electric valve. The first sewage discharge shut-off valve is used for manual sewage discharge, and the first electric valve is used for automatic sewage discharge. The first electric valve is sequentially connected to a motor compressor and a first check valve. The output end of the first check valve is connected to an external sewage pipe network. The two ends of the first electric valve are connected in parallel to a second sewage discharge shut-off valve, and the two ends of the motor compressor are connected in parallel to a third sewage discharge shut-off valve.

[0021] As a further embodiment of the present invention: the second sewage discharge mechanism specifically includes: a fourth sewage discharge shut-off valve and a second electric valve. The bottom output end of the second dehydration tank is connected to the fourth sewage discharge shut-off valve and the second electric valve. The fourth sewage discharge shut-off valve is used for manual sewage discharge, and the second electric valve is used for automatic sewage discharge. The second electric valve is connected to a second check valve. The second check valve is connected to a motor compressor. A fifth sewage discharge shut-off valve is connected in parallel to both ends of the second electric valve.

[0022] As a further aspect of the present invention: a flame arrester is provided on the pipeline connecting the oil storage tank and the first dehydration tank to prevent the propagation of flames.

[0023] As a further aspect of the present invention: a gas shut-off valve is connected between the flame arrester and the first dehydration tank to control the flow of flammable gas between the flammable gas and the first dehydration tank.

[0024] As a further aspect of the present invention, a third one-way valve is provided on the pipeline connecting the oil-gas separation mechanism to the external recovery network to prevent crude oil backflow.

[0025] As a further aspect of the present invention: a safety valve is fixedly connected to the top of the first dehydration tank, and a pressure measuring instrument communicating with the interior of the first dehydration tank is connected to the outside of the first dehydration tank.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] 1. This application dehydrates the combustible gas on the top of the oil storage tank twice, filters it, and then separates it into oil and gas. This not only yields pure crude oil for recycling, but also makes the various processing links of the entire recovery device neat and efficient, thereby improving the recovery efficiency of combustible gas on the top of the oil storage tank.

[0028] 2. In the two dehydration stages, the wastewater generated by this application can be effectively managed. Under normal circumstances, it is automatically discharged into the external sewage network and the pressure of the sewage discharge pipe can be adaptively adjusted. In case of failure, it can also be manually discharged in a timely manner. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of an intelligent device for recovering combustible gases from the top of an oil storage tank.

[0030] Figure 2 This is a schematic diagram of the oil-gas separation mechanism in an intelligent device for recovering combustible gases from the top of an oil storage tank.

[0031] Figure 3 This is a schematic diagram of the cooling component in an intelligent device for recovering combustible gases from the top of an oil storage tank.

[0032] Figure 4 This is a schematic diagram of the first sewage discharge mechanism in an intelligent device for recovering combustible gases from the top of an oil storage tank.

[0033] Figure 5 This is a schematic diagram of the second sewage discharge mechanism in an intelligent device for recovering combustible gases from the top of an oil storage tank.

[0034] In the diagram: 1. First dehydration tank; 2. Cooling assembly; 201. Evaporator; 202. Refrigeration unit; 203. Cooler; 204. Expansion valve; 3. Second dehydration tank; 4. Filter; 5. Oil-gas separation mechanism; 501. Oil-gas separator cylinder; 502. Screw compressor; 503. Motor; 504. Radiator; 505. Axial fan; 6. First sewage discharge mechanism; 601. First sewage discharge shut-off valve; 602. First electric valve; 603. Motor compressor; 604. First check valve; 605. Second sewage discharge shut-off valve; 606. Third sewage discharge shut-off valve; 7. Second sewage discharge mechanism; 701. Fourth sewage discharge shut-off valve; 702. Second electric valve; 703. Second check valve; 704. Fifth sewage discharge shut-off valve; 8. Flame arrester; 9. Gas shut-off valve; 10. Third check valve; 11. Pressure measuring instrument; 12. Safety valve; 13. Solenoid valve. Detailed Implementation

[0035] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0036] Please see Figures 1-5 In this embodiment of the invention, an intelligent device for recovering combustible gases from the top of an oil storage tank includes:

[0037] An oil storage tank, connected to the first dehydration tank 1, is used to transport the flammable gas volatilized from the top of the oil storage tank to the first dehydration tank 1 through a pipeline;

[0038] The first dehydration tank 1 is connected to the cooling assembly 2 and is used to dehydrate the combustible gas;

[0039] Cooling component 2, connected to the second dehydration tank 3, is used to cool the dehydrated combustible gas;

[0040] The second dehydration tank 3 is connected to the filter 4 and is used to dehydrate the cooled combustible gas and remove the natural gas from the combustible gas.

[0041] Filter 4, connected to the oil-gas separation unit 5, is used to filter natural gas;

[0042] The oil-gas separation unit 5 is connected to the external recovery pipeline network and is used to pressurize the filtered natural gas and transport the pressurized natural gas to the external recovery pipeline network through pipelines.

[0043] Solenoid valve 13 is installed between the external recovery pipeline and the oil storage tank. It is used to open when the pressure inside the oil storage tank drops to a threshold value to return natural gas to the oil storage tank.

[0044] The first sewage discharge mechanism 6 is connected to the first dewatering tank 1 and is used to discharge the sewage discharged from the first dewatering tank 1;

[0045] The second sewage discharge mechanism 7 is connected to the second dewatering tank 3 and is used to discharge the sewage discharged from the second dewatering tank 3.

[0046] This application can improve the recovery efficiency of combustible gases from the top of oil storage tanks and effectively manage the wastewater generated during the dehydration process.

[0047] In this embodiment: as Figure 2 As shown, the oil-gas separation mechanism 5 specifically includes: an oil-gas separation cylinder 501, a screw compressor 502, a cooling system, and a motor 503. The oil-gas separation cylinder 501 is connected to the filter 4 to receive filtered natural gas. The screw compressor 502 is located inside the oil-gas separation cylinder 501 to pressurize the natural gas fed into the oil-gas separation cylinder 501. The output end of the motor 503 is connected to the screw compressor 502 to drive the screw compressor 502. The cooling system is used to cool the pressurized natural gas and the high-temperature lubricating oil generated during the operation of the screw compressor 502. Separating the screw compressor 502 and the motor 503 avoids the motor 503 occupying the internal space of the oil-gas separation cylinder 501, thus avoiding affecting the amount of oil-gas separation.

[0048] In this embodiment, the cooling system specifically includes a radiator 504 and an axial fan 505. The radiator 504 is connected to an oil-gas separator 501 to absorb heat from the natural gas and lubricating oil. The axial fan 505 is located on one side of the radiator 504 and is used to blow away the heat absorbed by the radiator 504 to achieve cooling. During the process, the axial fan blows cooling air towards the radiator 504, thereby cooling the radiator 504 which is undergoing heat exchange.

[0049] In this embodiment, a minimum pressure valve is provided between the top of the radiator 504 and the top of the oil-gas separator 501 to serve as a buffer.

[0050] In this embodiment, an oil filter 4 is provided between the bottom of the radiator 504 and the bottom of the oil-gas separator 501, which serves as a filter medium.

[0051] In this embodiment, a temperature control valve is provided between the oil filter 4 and the top of the oil-gas separator 501 to balance the pipeline pressure.

[0052] In this embodiment, the cooling assembly 2 specifically includes an evaporator 201, a cooler 203, and a refrigeration unit 202. The evaporator 201 is connected to the first dehydration tank 1 and is used to cool the dehydrated combustible gas and transport the cooled combustible gas to the second dehydration tank 3. The refrigeration unit 202 is connected to the evaporator 201 and is used to return the refrigerant that has absorbed heat in the evaporator 201 to the cooler 203. The cooler 203 is connected to the refrigeration unit 202 and is used to cool the returned refrigerant with heat and transport the cooled refrigerant to the evaporator 201 to continue cooling the combustible gas. An expansion valve 204 is connected between the evaporator 201 and the cooler 203 to throttle and reduce the pressure of the refrigerant output from the cooler 203. The cooling assembly 2 effectively cools the dehydrated combustible gas, facilitating its entry into the next process.

[0053] In this embodiment: the first sewage discharge mechanism 6 specifically includes: a first sewage discharge shut-off valve 601 and a first electric valve 602. The bottom output end of the first dehydration tank 1 is connected to the first sewage discharge shut-off valve 601 and the first electric valve 602. The first sewage discharge shut-off valve 601 is used for manual sewage discharge, and the first electric valve 602 is used for automatic sewage discharge. The first electric valve 602 is sequentially connected to a motor compressor 603 and a first check valve 604. The output end of the first check valve 604 is connected to the external sewage pipe network. The two ends of the first electric valve 602 are connected in parallel to a second sewage discharge shut-off valve 605, and the two ends of the motor compressor 603 are connected in parallel to a third sewage discharge shut-off valve 606. The first sewage discharge mechanism 6 has two treatment methods for the sewage discharged from the first dehydration tank 1. One is the automatic sewage discharge method. In this method, the sewage flows through the first electric valve 602, is compressed by the motor compressor 603, and is discharged into the external sewage network through the first one-way valve 604. In addition, when the first electric valve 602 is under too much pressure, the second sewage discharge shut-off valve 605 can be opened to reduce the pressure through dual-channel sewage discharge. When the motor compressor 603 is under too much pressure, the third sewage discharge shut-off valve 606 can be opened to relieve the pressure. The other is the manual sewage discharge method, which is to open the first sewage discharge shut-off valve 601 to directly discharge the sewage. This sewage discharge method is suitable for use when the automatic sewage discharge method fails.

[0054] In this embodiment: gate valves are connected to both ends of the first electric valve 602, which can effectively balance the input and output pressure of the first electric valve 602, and a shut-off valve is connected between the output end of the first electric valve 602 and the corresponding gate valve, which can release pressure when the pressure is too high.

[0055] In this embodiment, shut-off valves are connected to both ends of the motor compressor 603 to control the amount of sewage compressed at both ends of the motor compressor 603, thereby preventing the motor compressor 603 from being damaged due to excessive load.

[0056] In this embodiment: the second sewage discharge mechanism 7 specifically includes: a fourth sewage discharge shut-off valve 701 and a second electric valve 702. The bottom output end of the second dehydration tank 3 is connected to the fourth sewage discharge shut-off valve 701 and the second electric valve 702. The fourth sewage discharge shut-off valve 701 is used for manual sewage discharge, and the second electric valve 702 is used for automatic sewage discharge. The second electric valve 702 is connected to a second check valve 703. The second check valve 703 is connected to the motor compressor 603. A fifth sewage discharge shut-off valve 704 is connected in parallel at both ends of the second electric valve 702. The second sewage discharge mechanism 7 has two treatment methods for the sewage discharged from the second dehydration tank 3. One is the automatic sewage discharge method. In this method, the sewage flows through the second electric valve 702 and is discharged into the motor compressor 603 through the second one-way valve 703. After being compressed by the motor compressor 603, it is discharged into the external sewage network through the first one-way valve 604. In addition, when the pressure on the second electric valve 702 is too high, the fifth sewage discharge shut-off valve 704 can be opened to reduce the pressure through dual-channel sewage discharge. The other is the manual sewage discharge method, which is to open the fourth sewage discharge shut-off valve 701 to directly discharge the sewage. This sewage discharge method is suitable for use when the automatic sewage discharge method fails.

[0057] In this embodiment: gate valves are connected to both ends of the second electric valve 702, which can effectively balance the input and output pressure of the second electric valve 702, and a shut-off valve is connected between the output end of the second electric valve 702 and the corresponding gate valve, which can release pressure when the pressure is too high.

[0058] In this embodiment, a flame arrester 8 is provided on the pipeline connecting the oil storage tank and the first dehydration tank 1 to prevent the spread of flames.

[0059] In this embodiment, a gas shut-off valve 9 is connected between the flame arrester 8 and the first dehydration tank 1 to control the flow of flammable gas between the flammable gas and the first dehydration tank 1.

[0060] In this embodiment, a third check valve 10 is provided on the pipeline connecting the oil-gas separation mechanism 5 to the external recovery pipeline network to prevent crude oil backflow.

[0061] In this embodiment: a safety valve 12 is fixedly connected to the top of the first dehydration tank 1, and a pressure measuring instrument 11 communicating with the interior of the first dehydration tank 1 is connected to the outside of the first dehydration tank 1.

[0062] In this embodiment: the intelligent device for recovering combustible gases from the top of the oil storage tank also includes a controller for controlling the operating status of the entire intelligent device.

[0063] The working principle of this invention is as follows: During use, the combustible gas volatilized from the top of the oil storage tank is transported to the first dehydration tank 1 through a pipeline. During the process, the combustible gas passes through the flame arrester 8 and the gas shut-off valve 9. Subsequently, the first dehydration tank 1 dehydrates the combustible gas. Wastewater (including liquid hydrocarbons) generated during the dehydration process is discharged by the first sewage discharge mechanism 6. The first sewage discharge mechanism 6 has two treatment methods for the wastewater discharged from the first dehydration tank 1. One is an automatic sewage discharge method. In this sewage discharge method, the wastewater flows through the first electric valve 602, is compressed by the motor compressor 603, and is discharged into the external sewage network through the first one-way valve 604. In addition, when the first electric valve 602 is under too much pressure, the second sewage shut-off valve 605 can be opened for dual-channel sewage discharge to reduce the pressure. When the motor compressor 603 is under too much pressure, the third sewage shut-off valve 606 can be opened to relieve the pressure. The other is a manual sewage discharge method, that is, the first sewage shut-off valve 601 is opened to directly discharge the wastewater. This sewage discharge method is suitable for use when the automatic sewage discharge method fails.

[0064] The dehydrated combustible gas is transported to the cooling assembly 2 for cooling. During the cooling process, the water vapor in the combustible gas is pre-cooled to form water, and some liquid hydrocarbons are cooled out. The cooling assembly 2 then transports the cooled combustible gas to the second dehydration tank 3 for dehydration. The wastewater (i.e., water and liquid hydrocarbons) generated during the dehydration process is discharged by the second sewage discharge mechanism 7. The second sewage discharge mechanism 7 has two treatment methods for the wastewater discharged from the second dehydration tank 3. One is the automatic sewage discharge method. In this sewage discharge method, the wastewater flows through the second electric valve 702 and is discharged into the motor compressor 603 through the second one-way valve 703. After being compressed by the motor compressor 603, it is discharged into the external sewage network through the first one-way valve 604. In addition, when the pressure on the second electric valve 702 is too high, the fifth sewage discharge shut-off valve 704 can be opened for dual-channel sewage discharge to reduce the pressure. The other is the manual sewage discharge method, which is to open the fourth sewage discharge shut-off valve 701 to directly discharge the wastewater. This sewage discharge method is suitable for use when the automatic sewage discharge method fails.

[0065] After the combustible gas is dehydrated in the second dehydration tank 3, natural gas is removed. The natural gas is then filtered through filter 4 and then sent to the oil-gas separation unit 5 for pressurization. The pressurized natural gas is then transported through pipelines to an external recycling network for reuse. It should be noted that the intelligent device for combustible gas recovery on the top of the oil storage tank operates when the internal pressure of the oil storage tank reaches a threshold (1700 Pa), extracting and recovering the combustible gas to effectively prevent damage caused by excessive pressure in the oil storage tank. When the internal pressure of the oil storage tank is detected to drop to the threshold (300 Pa), the solenoid valve 13 opens, returning the natural gas that was originally sent to the external recycling network to the oil storage tank to prevent damage caused by negative pressure in the oil storage tank.

[0066] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

[0067] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An intelligent device for recovering combustible gases from the top of an oil storage tank, characterized in that, include: An oil storage tank, connected to a first dehydration tank, is used to transport the flammable gas volatilized from the top of the oil storage tank to the first dehydration tank via a pipeline; The first dehydration tank, connected to the cooling assembly, is used to dehydrate the combustible gas; A cooling assembly, connected to a second dehydration tank, is used to cool the dehydrated combustible gas; The second dehydration tank, connected to the filter, is used to dehydrate the cooled combustible gas and remove the natural gas from the combustible gas. A filter, connected to an oil-gas separation unit, is used to filter natural gas; The oil-gas separation unit is connected to the external recovery pipeline network. It is used to pressurize the filtered natural gas and transport the pressurized natural gas to the external recovery pipeline network through pipelines. The solenoid valve is installed between the external recovery pipeline and the oil storage tank. It is used to open when the pressure inside the oil storage tank drops to a threshold value, so that natural gas can be returned to the oil storage tank. The first sewage discharge mechanism is connected to the first dewatering tank and is used to discharge the sewage discharged from the first dewatering tank. The second sewage discharge mechanism is connected to the second dewatering tank and is used to discharge the sewage discharged from the second dewatering tank. The oil-gas separation mechanism specifically includes: an oil-gas separation cylinder, a screw compressor, a cooling system, and a motor. The oil-gas separation cylinder is connected to a filter to receive filtered natural gas. The screw compressor is located inside the oil-gas separation cylinder to pressurize the incoming natural gas. The output end of the motor is connected to the screw compressor to drive the screw compressor. The cooling system is used to cool the pressurized natural gas and the high-temperature lubricating oil generated during the operation of the screw compressor. The cooling system specifically includes: a radiator and an axial fan. The radiator is connected to an oil-gas separator to absorb heat from natural gas and lubricating oil. The axial fan is located on one side of the radiator to blow away the heat absorbed by the radiator to achieve cooling. The cooling assembly specifically includes: an evaporator, a cooler, and a refrigeration unit. The evaporator is connected to a first dehydration tank and is used to cool the dehydrated combustible gas and deliver the cooled combustible gas to a second dehydration tank. The refrigeration unit is connected to the evaporator and is used to return the refrigerant that has absorbed heat in the evaporator to the cooler. The cooler is connected to the refrigeration unit and is used to cool the returned refrigerant with heat and deliver the cooled refrigerant to the evaporator to continue cooling the combustible gas. An expansion valve is connected between the evaporator and the cooler to throttle and reduce the pressure of the refrigerant output from the cooler. The first sewage discharge mechanism specifically includes: a first sewage discharge shut-off valve and a first electric valve. The bottom output end of the first dehydration tank is connected to the first sewage discharge shut-off valve and the first electric valve. The first sewage discharge shut-off valve is used for manual sewage discharge, and the first electric valve is used for automatic sewage discharge. The first electric valve is sequentially connected to a motor compressor and a first check valve. The output end of the first check valve is connected to an external sewage pipe network. A second sewage discharge shut-off valve is connected in parallel to both ends of the first electric valve, and a third sewage discharge shut-off valve is connected in parallel to both ends of the motor compressor.

2. The intelligent device for recovering combustible gases from the top of an oil storage tank according to claim 1, characterized in that, The second sewage discharge mechanism specifically includes: a fourth sewage discharge shut-off valve and a second electric valve. The bottom output end of the second dehydration tank is connected to the fourth sewage discharge shut-off valve and the second electric valve. The fourth sewage discharge shut-off valve is used for manual sewage discharge, and the second electric valve is used for automatic sewage discharge. The second electric valve is connected to a second check valve, which is connected to a motor compressor. A fifth sewage discharge shut-off valve is connected in parallel to both ends of the second electric valve.

3. The intelligent device for recovering combustible gases from the top of an oil storage tank according to claim 1, characterized in that, A flame arrester is installed on the pipeline connecting the oil storage tank and the first dehydration tank to prevent the spread of flames.

4. The intelligent device for recovering combustible gases from the top of an oil storage tank according to claim 3, characterized in that, A gas shut-off valve is connected between the flame arrester and the first dehydration tank to control the flow of flammable gas between the flammable gas and the first dehydration tank.

5. The intelligent device for recovering combustible gases from the top of an oil storage tank according to claim 1, characterized in that, The oil-gas separation mechanism is connected to the external recovery network via a third check valve to prevent crude oil backflow.

6. The intelligent device for recovering combustible gases from the top of an oil storage tank according to claim 1, characterized in that, A safety valve is fixedly connected to the top of the first dehydration tank, and a pressure measuring instrument communicating with the inside of the first dehydration tank is connected to the outside of the first dehydration tank.

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