An oil product storage tank breathing gas collecting and recycling device

Abstract

The present application relates to oil product storage tank breathing generated oil gas or VOCs exhaust gas treatment technical field, and disclose a kind of oil product storage tank breathing gas collection injection device, including the inhibition recovery of gas-liquid separation mechanism for oil gas breathing gas, oil gas compression mechanism, oil gas storage mechanism, security mechanism, complete set of processing device forms closed loop processing, no other byproduct is generated, and the excess oil gas after processing can be supplemented as fuel to gas pipeline, and the gas in the injection tank will accelerate the formation of the gas cavity space balance state in tank, to shorten and inhibit small breathing phenomenon, complete set of equipment is provided with combustible gas detection sensor, ensure that oil gas volatile gas is below lower explosive limit, and cooperate with the PLC device of full-automatic operation to control the valve structure in equipment, and discharge assembly is provided at the bottom oil liquid discharge pipe of oil gas storage tank, can realize the automatic closing control to oil liquid discharge pipe, can avoid that the gas in oil gas storage tank follows oil liquid discharge.

Description

Technical Field

[0001] This invention relates to the field of oil and gas or VOCs waste gas treatment technology generated by the breathing of oil storage tanks, specifically an oil storage tank breathing gas collection and reinjection device. Background Technology

[0002] According to the "Emission Standard of Air Pollutants for Onshore Oil and Gas Extraction Industry" (GB39728-2020), the crude oil dehydration, storage, loading and unloading processes in some crude oil tank areas are not fully enclosed. Therefore, it is necessary to modify the crude oil tanks that do not meet the emission standard requirements to achieve a fully enclosed process flow and achieve zero VOCs emissions.

[0003] The oil tank breathing gas collection and reinjection device mainly recovers the oil and gas or VOCs waste gas generated by the breathing of oil storage tanks. The pressurized oil and gas is sent to the external pipeline network or depressurized and used as the sealing gas for crude oil storage tanks. The gas generated by the breathing of the oil tank is discharged outside the storage tank through the breather valve at the top of the tank. Then, the gas discharged outside the storage tank is collected through pipeline valves and other fittings. After the oil and gas from the storage tank area is cooled, it enters the buffer tank in the oil tank breathing gas collection and reinjection device. After pressure stabilization, the oil and gas enters the gas pressurization device, which pressurizes the oil and gas. After the pressurized oil and gas is cooled again, it enters the subsequent gas storage tank. After pressure stabilization and gas-liquid separation, the oil and gas is sent to the external pipeline network or depressurized and used as the sealing gas for the storage tank.

[0004] Currently, the main mature technologies for treating breathing gas from oil tanks include RTO, RCO, and condensate recovery. These processes can basically meet the requirements for treating breathing gas from oil tanks, but there are still many problems.

[0005] Oil tank breathing gases can be categorized into large-scale breathing from oil intake and small-scale breathing from daily temperature and pressure changes and the inherent volatility of the oil, depending on the production operation. Most of the time, oil tank breathing gases are small-scale, resulting from these smaller-volume gases. While RTO and RCO technologies are used to treat oil tank breathing gases, the need for continuous ventilation at the collection end to create negative pressure leads to a continuous increase in the volume of breathing gases. Although back-end treatment is implemented, this incremental increase contradicts the fundamental logic and principles of environmental governance. Furthermore, reducing the amount of oil produced would significantly decrease economic viability.

[0006] The concentration of the breathing gas in the oil tank does not meet the energy requirements of treatment technologies such as RTO and RCO, thus necessitating the addition of refueling equipment. The operating costs of this technology are relatively high in the later stages.

[0007] 3. RTO and RCO technologies are based on the combustion stage of oil and gas. Since breathing oil and gas are combustible gases, the intake concentration of the terminal equipment must be controlled below the LEL (Lower Explosive Limit). If the operation is improper and the intake concentration is above the LEL, it can easily cause an explosion, posing a high safety risk.

[0008] 4. If the condensation recovery of exhaust gas fails to meet standards, additional waste gas treatment facilities (activated carbon adsorption devices) are required, resulting in high overall equipment investment and operation and maintenance costs, making it economically infeasible. Furthermore, for non-refined oil tanks such as crude oil tanks, the composition of the breathing gas is complex, making it difficult for primary cooling devices to condense and recover all components. Cryogenic devices can condense and recover more components, but they still cannot recover all components. Moreover, the investment in cryogenic devices is relatively high. Summary of the Invention

[0009] The purpose of this invention is to provide a breathing gas collection and reinjection device for oil storage tanks to solve the problems mentioned in the background art.

[0010] To achieve the above objectives, the present invention provides the following technical solution: an oil storage tank breathing gas collection and reinjection device, comprising a gas-liquid separation mechanism for suppressing and recovering oil and gas breathing gas, an oil and gas compression mechanism, an oil and gas storage mechanism, and a security mechanism, wherein the gas-liquid separation mechanism comprises a first gas-liquid heat exchanger, a gas-liquid separation tank, a membrane separation tank, and a desulfurizing agent tank;

[0011] The gas-liquid separation tank is used for buffering and separating volatile oil and gas. The lower part of the gas-liquid separation tank is used to collect liquid oil-water mixtures, and the upper part of the gas-liquid separation tank is used for storing oil and gas. The membrane separation tank performs deep oil-gas separation on simply separated oil and gas, and the desulfurizing agent tank is used for desulfurization treatment of deeply separated oil and gas.

[0012] The oil and gas compression mechanism includes an oil and gas compression device, which is used for compressing and pressurizing oil and gas after gas-liquid separation and desulfurization.

[0013] The oil and gas storage mechanism includes a second gas-liquid heat exchanger and an oil and gas storage tank. The second gas-liquid heat exchanger is used to cool the oil and gas after pressurization. The oil and gas storage tank is used to collect and store the cooled oil and gas. The oil and gas storage tank further performs gas-liquid separation on the compressed oil and gas. The separated oil and gas can be used as fuel gas to be transported to a combustion furnace or to a natural gas pipeline.

[0014] The security mechanism is used for the safety detection of oil and gas. The security mechanism includes a temperature sensor for the main pipeline, an oxygen content analyzer for the main pipeline, a pressure sensor for the main pipeline, a thermometer for the gas-liquid separator, a pressure gauge for the gas-liquid separator, a thermometer for the oil and gas storage tank, a pressure sensor for the oil and gas storage tank, an orifice flow meter, a level gauge for the gas-liquid separator, a level gauge for the oil and gas storage tank, and a level gauge for the oil storage tank.

[0015] Preferably, the device also includes an automatic control section, which is a PLC control device. The PLC control device consists of multiple sensors installed in the equipment and a central processing unit connected to the sensors. The central processing unit controls the operation of the solenoid valves in the device through the signal feedback from the central processing unit of the temperature sensor of the main pipeline, the oxygen content analyzer of the main pipeline, the pressure sensor of the main pipeline, the thermometer of the gas-liquid separator, the pressure gauge of the gas-liquid separator, the thermometer of the oil and gas storage tank, the pressure sensor of the oil and gas storage tank, the orifice plate flow meter, the level gauge of the gas-liquid separator, the level gauge of the oil and gas storage tank, and the level gauge of the oil storage tank.

[0016] Preferably, the system also includes an oil and gas transmission pipeline and an oil storage tank. The inlet end of the oil storage tank is connected to the outlet end of the gas-liquid separator via the oil and gas transmission pipeline. The lower outlet end of the oil and gas storage tank is connected to the inlet end of the oil storage tank via the oil and gas transmission pipeline. The upper outlet end of the gas-liquid separator is connected to the inlet end of the membrane separator via the oil and gas transmission pipeline. The outlet end of the membrane separator is connected to the inlet end of the desulfurizing agent tank via the oil and gas transmission pipeline. The outlet end of the desulfurizing agent tank is connected to the inlet end of the oil and gas compression device via the oil and gas transmission pipeline. The outlet end of the oil and gas compression device is connected to the inlet end of the oil and gas storage tank via the oil and gas transmission pipeline. The upper outlet end of the oil and gas storage tank is connected to the combustion furnace. The lower outlet end of the oil and gas storage tank is connected to the gas-liquid separator via the oil and gas transmission pipeline.

[0017] Preferably, the first gas-liquid heat exchanger is located on the upper part of the oil and gas conveying pipeline at the inlet end of the gas-liquid separator. A gas-liquid separator inlet switch valve is provided at the front of the first gas-liquid heat exchanger. The temperature sensor of the collection pipeline, the oxygen content analyzer of the collection pipeline, and the pressure sensor of the collection pipeline are all located at the front end of the gas-liquid separator inlet switch valve. An emergency venting pipeline is connected to the front of the gas-liquid separator inlet switch valve. An emergency discharge pipeline switch valve is provided at the upper part of the emergency venting pipeline.

[0018] Preferably, the gas-liquid separator safety valve, gas-liquid separator thermometer, and gas-liquid separator pressure gauge are all installed on the upper part of the gas-liquid separator body, and the gas-liquid separator level gauge is installed on the lower tank side of the gas-liquid separator body.

[0019] Preferably, the aforementioned oil and gas compression device is a frequency converter. The oil and gas compression device adjusts its frequency according to the operating values ​​of the temperature sensor of the main pipeline, the oxygen content analyzer of the main pipeline, and the pressure sensor of the main pipeline. The second gas-liquid heat exchanger is located at the top of the oil and gas transmission pipeline between the oil and gas compression device and the oil and gas storage tank.

[0020] Preferably, the oil and gas storage tank is a vertical tank. The oil and gas storage tank thermometer and oil and gas storage tank pressure sensor are both located at the top of the oil and gas storage tank. An oil and gas storage tank safety valve is installed on the top of the oil and gas storage tank. An oil and gas storage tank outlet pipeline switch valve is installed at the top of the oil and gas delivery pipeline at the upper outlet end of the oil storage tank. The orifice plate flow meter is located in front of the oil and gas storage tank outlet pipeline switch valve. An oil and gas return three-way valve is installed on the side of the oil and gas storage tank.

[0021] Preferably, the oil and gas storage tank is provided with an oil discharge pipe at the bottom outlet end, and an oil pipe connector is fixed to the upper part of the oil discharge pipe. The upper part of the oil pipe connector is provided with a first thread, and the lower outlet side of the oil and gas storage tank is provided with an installation thread. The oil pipe connector is installed to the bottom of the oil and gas storage tank by thread, and a sealing gasket is provided at the connection between the oil pipe connector and the oil and gas storage tank.

[0022] Preferably, the upper part of the above-mentioned oil pipe connector is provided with a discharge assembly, which includes a metal filter and a float. A spherical groove is provided in the middle of the top side of the oil pipe connector. The spherical groove is adapted to the float, and the float is movably fitted into the inner side of the spherical groove.

[0023] Preferably, the top opening of the aforementioned oil pipe connector is provided with an internal thread, the lower part of the outer frame of the metal filter screen is provided with a second thread, the metal filter screen is installed on the upper part of the oil pipe connector via the thread, the float floats with the oil inside the metal filter screen, the oil storage tank is connected to the oil discharge pipe at the bottom of the oil storage tank via an oil and gas transmission pipeline, the oil storage tank level gauge is located on the upper part of the oil storage tank, and an oil transfer pump is provided at the rear of the oil storage tank.

[0024] Compared with the prior art, the present invention, employing the above technical solution, has the following technical effects:

[0025] 1. The oil products converted from the oil and gas after cooling in this device can be reinjected into the oil storage tank. The entire processing device forms a closed loop, with no other by-products generated, eliminating the need for by-product processing. The excess oil and gas after processing can be used as fuel to supplement the gas pipeline, which is energy-saving and environmentally friendly. Furthermore, the gas reinjected into the oil tank will accelerate the formation of a balanced state in the gas chamber space inside the tank, thereby shortening and suppressing the small breathing phenomenon, reducing the amount of breathing gas, which is more in line with the concept of environmental protection and increases the economic benefits of production.

[0026] 2. The entire set of equipment is equipped with early warning and detection sensors such as combustible gas alarm, oxygen content detector, and H2S gas detector. The oxygen content detector controls the oxygen content of the oil and gas volatiles to ensure that the oil and gas volatiles are below the lower explosive limit, which can reduce the safety hazards and dangers of the equipment. It is also equipped with a PLC device that can operate in a fully automatic manner to control the valve structure inside the equipment. The equipment does not involve consumable parts or vulnerable parts, which improves production efficiency and reduces the labor intensity of workers in daily production and operation.

[0027] 3. A discharge assembly is installed at the bottom of the oil discharge pipe of the oil and gas storage tank. The discharge assembly consists of a metal filter and a float. When the oil is discharged, the float floats with the oil. When the oil in the oil and gas storage tank is about to be drained, the float engages with the spherical groove at the outlet of the oil pipe connection seat, which can realize the automatic closing control of the oil discharge pipe. This can prevent the gas in the oil and gas storage tank from being discharged with the oil, and greatly improve the working stability of the device. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the overall working structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the control relationship structure of the present invention;

[0031] Figure 3 This is a schematic diagram of the front structure of the oil and gas storage tank of the present invention;

[0032] Figure 4 This is a schematic diagram of the rear structure of the oil and gas storage tank of the present invention;

[0033] Figure 5 This is a schematic diagram of the overall installation structure of the discharge assembly of the present invention;

[0034] Figure 6 This is a schematic diagram of the disassembled upper structure of the discharge component of the present invention;

[0035] Figure 7 This is a schematic diagram of the lower structure of the discharge component of the present invention.

[0036] Explanation of reference numerals in the attached drawings: 1. First gas-liquid heat exchanger; 2. Gas-liquid separator tank; 3. Oil-gas compression device; 4. Second gas-liquid heat exchanger; 5. Oil-gas storage tank; 6. Oil storage tank; 7. Oil transfer pump; 8. Gas-liquid separator inlet switch valve; 9. Emergency discharge pipeline switch valve; 10. Oil-gas storage tank outlet pipeline switch valve; 11. Oil-gas reflux three-way valve; 12. Gas-liquid separator tank safety valve; 13. Oil-gas storage tank safety valve; 14. Summarizing pipeline temperature sensor; 15. Summarizing pipeline oxygen content analyzer; 16. Summarizing pipeline pressure... 17. Force sensor; 18. Gas-liquid separator thermometer; 19. Gas-liquid separator pressure gauge; 20. Oil and gas storage tank thermometer; 21. Oil and gas storage tank pressure sensor; 22. Orifice plate flow meter; 23. Gas-liquid separator level gauge; 24. Oil and gas storage tank level gauge; 25. Oil storage tank level gauge; 26. Membrane separator; 27. Desulfurizing agent tank; 28. Oil discharge pipe; 29. ​​Oil pipe connector; 30. Metal filter screen; 31. Float; 32. First thread; 33. Sealing ring gasket; 34. Second thread; 35. Spherical groove. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce. Example

[0039] Please see Figure 1-7 The present invention provides a technical solution: an oil storage tank breathing gas collection and reinjection device, comprising four main parts: a gas-liquid separation mechanism for suppressing and recovering oil and gas breathing gas, an oil and gas compression mechanism, an oil and gas storage mechanism, and a security mechanism.

[0040] The specific connection method is shown in the attached document. Figure 1As shown, the inlet end of the oil storage tank 6 is connected to the outlet end of the gas-liquid separator 2 via an oil-gas transmission pipeline. The inlet end of the oil storage tank 6 is connected to the oil discharge pipe 27 at the bottom of the oil-gas storage tank 5 via an oil-gas transmission pipeline. The upper outlet end of the gas-liquid separator 2 is connected to the inlet end of the membrane separator 25 via an oil-gas transmission pipeline. The outlet end of the membrane separator 25 is connected to the inlet end of the desulfurizing agent tank 26 via an oil-gas transmission pipeline. The outlet end of the desulfurizing agent tank 26 is connected to the inlet end of the oil-gas compression device 3 via an oil-gas transmission pipeline. The outlet end of the oil-gas compression device 3 is connected to the inlet end of the oil-gas storage tank 5 via an oil-gas transmission pipeline. The upper outlet end of the oil-gas storage tank 5 is connected to the combustion furnace. The lower outlet end of the oil-gas storage tank 5 is connected to the gas-liquid separator 2 via an oil-gas transmission pipeline.

[0041] The gas-liquid separation mechanism is used to separate light oil and gas. The gas-liquid separation mechanism includes a first gas-liquid heat exchanger 1, a gas-liquid separation tank 2, a membrane separation tank 25, and a desulfurizing agent tank 26. The gas-liquid separation tank 2 is used for buffering and gas-liquid separation of volatile oil and gas. It adopts a vertical double-headed storage tank and is made of stainless steel. The cooled oil and gas enter from the middle of the storage tank. The lower part of the gas-liquid separation tank 2 is used to collect liquid oil-water mixture. Light oil accumulates at the bottom of the storage tank and is transferred to the oil storage tank after reaching the limit liquid level. The upper part of the gas-liquid separation tank 2 is used for oil and gas storage. Heavy oil and gas accumulate at the top of the storage tank and enter the lower processing unit through the outlet pipe at the top of the tank.

[0042] To facilitate heat exchange and cooling of oil and gas, the first gas-liquid heat exchanger 1 is installed above the oil and gas conveying pipeline at the inlet end of the gas-liquid separator 2. The first gas-liquid heat exchanger 1 adopts a plate heat exchanger and is made of stainless steel. Gas and liquid flow countercurrent heat exchange is used. The light gas in the oil breathing gas is cooled and converted into light oil. The front of the first gas-liquid heat exchanger 1 is equipped with a gas-liquid separator inlet switch valve 8 to control the on / off of oil and gas. In order to facilitate the discharge of oil and gas in emergencies, an emergency venting pipeline is connected to the front of the gas-liquid separator inlet switch valve 8. An emergency discharge pipeline switch valve 9 is installed at the top of the emergency venting pipeline.

[0043] Membrane separator 25 is a vertical storage tank made of stainless steel. The membrane is a proton exchange membrane. After simple treatment, the oil and gas enter the membrane separator 25 for deep separation. The proton exchange membrane is an atmospheric pressure separation membrane, which requires very little power to separate the oil and gas. Desulfurizer tank 26 is used for desulfurization treatment of deep separated oil and gas. It is a vertical storage tank made of stainless steel. The desulfurizer is a rare earth modified zinc oxide composite absorbent. The absorbent is arranged in layers. The filling amount of desulfurizer can be determined according to the H2S gas concentration in the oil and gas to ensure the removal rate of H2S gas.

[0044] The oil and gas compression mechanism is used for the compression, pressurization, and cooling of heavy oil and gas. The mechanism includes an oil and gas compression unit 3, which is used for the compression and pressurization of oil and gas after gas-liquid separation and desulfurization. The oil and gas compression unit 3 is a frequency converter. A pipe temperature sensor 14, a pipe oxygen content analyzer 15, and a pipe pressure sensor 16 are all located at the front end of the inlet valve 8 of the gas-liquid separator. The pipe oxygen content analyzer 15 is an online analyzer, and sampling points are set near it to detect the oxygen content of the oil and gas in the pipeline. The oil and gas compression unit 3 adjusts the pressure based on the pipe temperature sensor 14, the pipe oxygen content analyzer 15, and the pipe pressure sensor 16. The operating condition value of the pipe pressure sensor 16 is frequency-adjusted to form an interlock control. The high alarm value of the pipe pressure sensor 16 is set to 500Pa and the low alarm value to 200Pa. When the high alarm value is reached, the oil-gas compression device 3 automatically starts. When the pressure of the pipe reaches the low alarm value, the oil-gas compression device 3 automatically shuts down. The whole process is automatically controlled by PLC. The oil-gas compression device 3 is suitable for the compression of combustible gases. The oil-gas compression device 3 as a whole needs to be explosion-proof. The oil-gas compression device 3 increases the pressure of heavy oil and gas from 0.2KPa to 0.5-0.6MPa to provide power for oil and gas transportation. At the same time, it also compresses the heavy oil and gas to increase its mass density.

[0045] The oil and gas storage mechanism is used for storing heavy pressurized oil and gas. The oil and gas storage mechanism includes a second gas-liquid heat exchanger 4 and an oil and gas storage tank 5. The second gas-liquid heat exchanger 4 is used to cool the pressurized oil and gas. The oil and gas storage tank 5 is used to collect and store the cooled oil and gas. The oil and gas storage tank 5 further separates the compressed oil and gas into gas and liquid. An oil and gas storage tank safety valve 13 is installed on the top of the oil and gas storage tank 5. In order to facilitate the discharge and utilization of oil and gas, an oil and gas storage tank outlet pipeline switch valve 10 is installed at the upper part of the oil and gas conveying pipeline at the upper outlet end of the oil storage tank 6. An orifice flow meter 21 is installed in front of the oil and gas storage tank outlet pipeline switch valve 10. The separated oil and gas can be used as fuel gas to be transported to the combustion furnace or to the natural gas pipeline network. An oil and gas return three-way valve 11 is installed on the side of the oil and gas storage tank 5.

[0046] To facilitate heat exchange and cooling of heavy pressurized oil and gas, the second gas-liquid heat exchanger 4 is installed above the oil and gas conveying pipeline between the oil and gas compression device 3 and the oil and gas storage tank 5. After the heavy oil and gas is compressed and pressurized, the gas temperature will rise. The second gas-liquid heat exchanger 4 is used to cool down the heavy oil and gas. The second gas-liquid heat exchanger 4 adopts a plate heat exchanger and is made of stainless steel. Gas and liquid flow countercurrent heat exchange.

[0047] As attached Figure 3As shown, the oil and gas storage tank 5 is a vertical storage tank. To facilitate the discharge of oil, an oil discharge pipe 27 is provided at the bottom outlet end of the oil and gas storage tank 5. To facilitate the installation of the oil discharge pipe 27, an oil pipe connector 28 is fixed at the upper part of the oil discharge pipe 27. The upper part of the oil pipe connector 28 is provided with a first thread 31. The lower outlet side of the oil and gas storage tank 5 is provided with an installation thread. The oil pipe connector 28 is installed at the bottom of the oil and gas storage tank 5 by thread. To improve the installation sealing of the oil pipe connector 28, a sealing gasket 32 ​​is provided at the connection between the oil pipe connector 28 and the oil and gas storage tank 5.

[0048] To facilitate oil discharge control, a discharge assembly is provided on the upper part of the oil pipe connector 28, as shown in the attached figure. Figure 6 As shown, the discharge assembly includes a metal filter 29 and a float 30. A spherical groove 34 is provided in the center of the top side of the oil pipe connector 28. The spherical groove 34 is adapted to the float 30, and the float 30 is movably fitted inside the spherical groove 34. The float 30 is made of lightweight plastic and floats with the oil inside the metal filter 29. When the oil in the oil and gas storage tank 5 is about to be drained, the float 30 engages with the spherical groove 34 at the outlet of the oil pipe connector 28, allowing... Automatic closing control of the oil discharge pipe 27 can prevent gas in the oil and gas storage tank 5 from being discharged with the oil. To facilitate the installation of the metal filter screen 29, an internal thread is provided inside the top opening of the oil pipe connector 28. A second thread 33 is provided at the lower part of the outer frame of the metal filter screen 29. The metal filter screen 29 is installed on the upper part of the oil pipe connector 28 through the thread. The metal filter screen 29 is made of metal and has holes evenly provided on the upper part. While providing a limit for the float 30, it can also filter large particulate impurities in the oil.

[0049] The security system is used for safety monitoring of oil and gas. It includes a mains pipe temperature sensor 14, a mains pipe oxygen content analyzer 15, a mains pipe pressure sensor 16, a gas-liquid separator thermometer 17, a gas-liquid separator pressure gauge 18, an oil and gas storage tank thermometer 19, an oil and gas storage tank pressure sensor 20, an orifice flow meter 21, a gas-liquid separator level gauge 22, an oil and gas storage tank level gauge 23, and an oil storage tank level gauge 24. To ensure the safe operation of the gas-liquid separator 2, the gas-liquid separator safety valve 12, the gas-liquid separator thermometer 17, and the gas-liquid separator pressure gauge 18 are all installed on the upper part of the gas-liquid separator 2. A full-opening safety valve is installed at the top of the gas-liquid separator. The gas-liquid separator level gauge 22 is installed on the lower side of the gas-liquid separator 2 for detecting the oil level inside the gas-liquid separator 2. To ensure the safe operation of the oil and gas storage tank 5... For safety, the oil and gas storage tank thermometer 19 and the oil and gas storage tank pressure sensor 20 are both installed on the upper part of the oil and gas storage tank 5. When the gas level in the tank exceeds the set value of the full-opening safety valve, the gas in the gas-liquid separator is discharged to the chimney through the safety valve. An automatic control switch valve is installed on the gas-liquid separation section's conveying pipeline, which can be remotely controlled in case of emergencies. The sensor values ​​are displayed on the PLC control cabinet panel. When the liquid level exceeds the specified level, the switch valve at the bottom of the tank opens, conveying the oil to the oil storage tank 6. The oil storage tank level gauge 24 is installed on the upper part of the oil storage tank 6. An oil transfer pump 7 is installed at the rear of the oil storage tank 6. When the liquid level exceeds the high alarm set value, the oil transfer pump 7 is turned on. The liquid level alarm is displayed on the PLC control cabinet panel. The oil transfer pump 7 can be turned on by the PLC or by the local operating column.

[0050] The security system also includes an automatic control section, which is a PLC control device. This PLC control device consists of multiple sensors installed in the equipment and a central processing unit connected to the sensors, as shown in the attached diagram. Figure 2 The diagram shows the control relationship structure of the automatic control section. The central processing unit controls the operation of the solenoid valves in the device through the signal feedback from the central processing unit of the following components: temperature sensor 14 in the main pipeline, oxygen content analyzer 15 in the main pipeline, pressure sensor 16 in the main pipeline, thermometer 17 in the gas-liquid separator, pressure gauge 18 in the gas-liquid separator, thermometer 19 in the oil and gas storage tank, pressure sensor 20 in the oil and gas storage tank, orifice plate flow meter 21, level gauge 22 in the gas-liquid separator, level gauge 23 in the oil and gas storage tank, and level gauge 24 in the oil storage tank. The equipment does not involve consumable or easily damaged parts, which improves production efficiency and reduces the labor intensity of workers in daily production operations.

[0051] In summary, the oil products converted from the cooled oil and gas in this device can be reinjected into the oil storage tank 6. The entire processing device forms a closed loop, with no other by-products generated, eliminating the need for by-product processing. The excess oil and gas after processing can be used as fuel to supplement the gas pipeline, which is energy-saving and environmentally friendly. Furthermore, the gas reinjected into the oil tank will accelerate the formation of a balanced state in the gas chamber space inside the tank, thereby shortening and suppressing the small breathing phenomenon, reducing the amount of breathing gas, which is more in line with the concept of environmental protection and increases the economic benefits of production.

[0052] The entire set of equipment is equipped with early warning and detection sensors such as combustible gas alarm, oxygen content detector, and H2S gas detector. The oxygen content detector controls the oxygen content of the oil and gas volatiles to ensure that the volatiles are below the lower explosive limit, which can reduce the safety hazards and dangers of the equipment. It is also equipped with a PLC device that can operate in a fully automatic manner to control the valve structure inside the equipment. The equipment does not involve consumable parts or vulnerable parts, which improves production efficiency and reduces the labor intensity of workers in daily production and operation.

[0053] A discharge assembly is installed at the bottom oil discharge pipe 27 of the oil and gas storage tank 5. The discharge assembly consists of a metal filter screen 29 and a float 30. When the oil is discharged, the float 30 floats with the oil. When the oil in the oil and gas storage tank 5 is about to be drained, the float 30 engages with the spherical groove 34 at the outlet of the oil pipe connector 28, which can realize the automatic closing control of the oil discharge pipe 27, prevent the gas in the oil and gas storage tank 5 from being discharged with the oil, and greatly improve the working stability of the device.

[0054] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. It should be noted that implementations not illustrated or described in the drawings or the main text of the specification are forms known to those skilled in the art and are not described in detail. Furthermore, the definitions of the components described above are not limited to the various specific structures, shapes, or methods mentioned in the embodiments, and those skilled in the art can easily modify or substitute them.

[0055] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for collecting and reinjecting breathing gas from an oil storage tank, comprising a gas-liquid separation mechanism for suppressing and recovering breathing gas, an oil-gas compression mechanism, an oil-gas storage mechanism, and a security mechanism, characterized in that: The gas-liquid separation mechanism includes a first gas-liquid heat exchanger (1), a gas-liquid separation tank (2), a membrane separation tank (25), and a desulfurizing agent tank (26). The gas-liquid separation tank (2) is used for buffering and gas-liquid separation of volatile oil and gas. The lower part of the gas-liquid separation tank (2) is used to collect liquid oil-water mixtures. The upper part of the gas-liquid separation tank (2) is used for oil and gas storage. The membrane separation tank (25) performs deep oil-gas separation on simply separated oil and gas. The desulfurizing agent tank (26) is used for desulfurization treatment of deeply separated oil and gas. The oil and gas compression mechanism includes an oil and gas compression device (3), which is used for the compression and pressurization of oil and gas after gas-liquid separation and desulfurization. The oil and gas storage mechanism includes a second gas-liquid heat exchanger (4) and an oil and gas storage tank (5). The second gas-liquid heat exchanger (4) is used to cool the oil and gas after pressurization. The oil and gas storage tank (5) is used to collect and store the cooled oil and gas. The oil and gas storage tank (5) further separates the compressed oil and gas into gas and liquid. The separated oil and gas can be used as fuel gas to be transported to a combustion furnace or to a natural gas pipeline. The security mechanism is used for the safety detection of oil and gas. The security mechanism includes a temperature sensor (14) for the main pipeline, an oxygen content analyzer (15) for the main pipeline, a pressure sensor (16) for the main pipeline, a thermometer (17) for the gas-liquid separator, a pressure gauge (18) for the gas-liquid separator, a thermometer (19) for the oil and gas storage tank, a pressure sensor (20) for the oil and gas storage tank, an orifice plate flow meter (21), a level gauge (22) for the gas-liquid separator, a level gauge (23) for the oil and gas storage tank, and a level gauge (24) for the oil storage tank. The collection and reinjection device also includes an oil and gas pipeline and an oil storage tank (6). The inlet end of the oil storage tank (6) is connected to the outlet end of the gas-liquid separator (2) via an oil and gas pipeline. The lower outlet end of the oil and gas storage tank (5) is connected to the inlet end of the oil storage tank (6) via an oil and gas pipeline. The upper outlet end of the gas-liquid separator (2) is connected to the inlet end of the membrane separator (25) via an oil and gas pipeline. The outlet end of the membrane separator (25) is connected to the degassing tank (25) via an oil and gas pipeline. The inlet end of the desulfurizing agent tank (26) is connected to the oil and gas transmission pipeline. The outlet end of the desulfurizing agent tank (26) is connected to the inlet end of the oil and gas compression device (3) through the oil and gas transmission pipeline. The outlet end of the oil and gas compression device (3) is connected to the inlet end of the oil and gas storage tank (5) through the oil and gas transmission pipeline. The upper outlet end of the oil and gas storage tank (5) is connected to the combustion furnace. The lower outlet end of the oil and gas storage tank (5) is connected to the gas-liquid separation tank (2) through the oil and gas transmission pipeline. The first gas-liquid heat exchanger (1) is located on the upper part of the oil and gas conveying pipeline at the inlet end of the gas-liquid separation tank (2). The gas-liquid separator inlet switch valve (8) is provided at the front of the first gas-liquid heat exchanger (1). The temperature sensor (14), oxygen content analyzer (15), and pressure sensor (16) of the summing pipeline are all located at the front end of the gas-liquid separator inlet switch valve (8). An emergency venting pipeline is connected to the front of the gas-liquid separator inlet switch valve (8). An emergency discharge pipeline switch valve (9) is provided at the upper part of the emergency venting pipeline. The collection and reinjection device also includes a gas-liquid separator safety valve (12), the gas-liquid separator safety valve (12), the gas-liquid separator thermometer (17) and the gas-liquid separator pressure gauge (18) are all installed on the upper part of the gas-liquid separator body (2), and the gas-liquid separator level gauge (22) is installed on the lower tank side of the gas-liquid separator body (2). The oil and gas compression device (3) is a frequency converter. The oil and gas compression device (3) adjusts the frequency according to the operating conditions of the temperature sensor (14), oxygen content analyzer (15), and pressure sensor (16) of the main pipe. The second gas-liquid heat exchanger (4) is located at the top of the oil and gas transmission pipeline between the oil and gas compression device (3) and the oil and gas storage tank (5).

2. The oil storage tank breathing gas collection and reinjection device according to claim 1, characterized in that, It also includes an automatic control section, which is a PLC control device. The PLC control device consists of multiple sensors installed in the equipment and a central processing unit connected to the sensors. The central processing unit controls the operation of the solenoid valves in the device through the signal feedback from the central processing unit of the following devices: the temperature sensor (14) of the main pipe, the oxygen content analyzer (15) of the main pipe, the pressure sensor (16) of the main pipe, the thermometer (17) of the gas-liquid separator, the pressure gauge (18) of the gas-liquid separator, the thermometer (19) of the oil and gas storage tank, the pressure sensor (20) of the oil and gas storage tank, the orifice plate flow meter (21), the level gauge (22) of the gas-liquid separator, the level gauge (23) of the oil and gas storage tank, and the level gauge (24) of the oil storage tank.

3. The oil storage tank breathing gas collection and reinjection device according to claim 1, characterized in that, The oil and gas storage tank (5) is a vertical storage tank. The oil and gas storage tank thermometer (19) and the oil and gas storage tank pressure sensor (20) are both located on the upper part of the oil and gas storage tank (5). An oil and gas storage tank safety valve (13) is installed on the top of the oil and gas storage tank (5). An oil and gas storage tank outlet pipeline switch valve (10) is installed on the upper part of the oil and gas transmission pipeline at the upper outlet end of the oil storage tank (6). The orifice plate flow meter (21) is located in front of the oil and gas storage tank outlet pipeline switch valve (10). An oil and gas return three-way valve (11) is installed on the side of the oil and gas storage tank (5).

4. The oil storage tank breathing gas collection and reinjection device according to claim 3, characterized in that, The bottom outlet end of the oil and gas storage tank (5) is provided with an oil discharge pipe (27), the upper part of the oil discharge pipe (27) is fixed with an oil pipe connector (28), the upper part of the oil pipe connector (28) is provided with a first thread (31), the lower outlet side of the oil and gas storage tank (5) is provided with an installation thread, the oil pipe connector (28) is installed at the bottom of the oil and gas storage tank (5) by thread, and a sealing gasket (32) is provided at the connection between the oil pipe connector (28) and the oil and gas storage tank (5).

5. The oil storage tank breathing gas collection and reinjection device according to claim 4, characterized in that, The upper part of the oil pipe connector (28) is provided with a discharge assembly, which includes a metal filter (29) and a float (30). The top side of the oil pipe connector (28) is provided with a spherical groove (34), which is adapted to the float (30). The float (30) is movably fitted into the inner side of the spherical groove (34).

6. The oil storage tank breathing gas collection and reinjection device according to claim 5, characterized in that, The top opening of the oil pipe connector (28) is provided with an internal thread, and the lower part of the outer frame of the metal filter (29) is provided with a second thread (33). The metal filter (29) is installed on the upper part of the oil pipe connector (28) by the thread. The float (30) floats with the oil inside the metal filter (29). The oil storage tank (6) is connected to the oil discharge pipe (27) at the bottom of the oil storage tank (5) through the oil and gas transmission pipeline. The oil storage tank level gauge (24) is set on the upper part of the oil storage tank (6). The oil storage tank (6) is provided with an oil transfer pump (7) at the rear of the oil storage tank (6).

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