Three-time oil gas recovery device

Abstract

The utility model relates to the technical field of oil gas recovery, in particular to a three-time oil gas recovery device which comprises a first vacuum pump and a vortex tube heat exchanger. An inlet of the first vacuum pump communicates with the oil tank. An inlet of the vortex tube communicates with an outlet of the first vacuum pump. A cold runner and a hot runner are arranged in the heat exchanger, the cold runner communicates with a cold end outlet of the vortex tube, an inlet of the hot runner communicates with a hot end outlet of the vortex tube, and an outlet of the hot runner communicates with the interior of the oil tank. Oil gas in the oil tank is pumped into the vortex tube through the first vacuum pump, cold oil gas is discharged from a cold end outlet of the vortex tube to cool the cold runner, and hot oil gas discharged from a hot end outlet of the vortex tube exchanges heat with the cold runner when passing through the hot runner. And liquefied oil liquid and non-liquefied oil gas return to the oil tank after being discharged. Compared with pressurization completely relying on a membrane filter, the cost is lower, no waste is generated compared with activated carbon adsorption, secondary pollution is avoided, and high-frequency maintenance is not needed.

Description

Technical Field

[0001] The present application relates to the technical field of oil and gas recovery, and more specifically, to a tertiary oil and gas recovery device. Background Art

[0002] The tertiary oil and gas recovery mainly deals with the volatiles of gasoline in the oil tank due to temperature changes and movement, as well as the oil and gas recovered from the secondary oil and gas. The current tertiary oil and gas recovery technology is to connect the oil tank through a pipeline. When the oil tank pressure reaches a certain value and before the breathing valve is opened, the oil and gas in the oil tank are led out for treatment. The drawn oil and gas are treated and discharged into the atmosphere after meeting the emission requirements. The current treatment technologies are mostly adsorption and membrane separation technologies.

[0003] The adsorption method is to draw out the oil and gas in the oil tank and then adsorb the oil and gas through activated carbon, making the oil and gas relatively clean. After meeting the emission requirements, it is directly discharged, and the adsorbed activated carbon releases the absorbed oil and gas through vacuum desorption, entering the next cycle or entering the underground oil tank. The number of adsorption and desorption of activated carbon is limited, and it needs frequent maintenance. In addition, activated carbon that has adsorbed oil and gas needs to be scrapped and disposed of. It is also a hazardous waste and is prone to secondary pollution.

[0004] Membrane separation technology is to draw the oil and gas out of the oil tank and pass them into the membrane filter. The membrane filter filters the oil and gas, and some of the gas returns to the oil tank, and some of the qualified gas is discharged into the atmosphere. At present, the price of membrane filter components is very high, and the cost of relying solely on membrane filter filtration is relatively high. Utility Model Content

[0005] In order to overcome the problems existing in the related art to a certain extent, the purpose of this application is to provide a tertiary oil and gas recovery device, which can solve the problems of frequent maintenance and easy secondary pollution of the adsorption method during tertiary oil and gas recovery and the high cost of membrane separation technology. The preferred technical solutions among the many technical solutions provided in this application can produce many technical effects as described below.

[0006] The present application provides a tertiary oil and gas recovery device, comprising:

[0007] a first vacuum pump, wherein an inlet of the first vacuum pump is in communication with the interior of the oil tank;

[0008] a vortex tube, wherein the inlet of the vortex tube is connected to the outlet of the first vacuum pump;

[0009] A heat exchanger is provided with a cold runner and a hot runner, wherein the cold runner is connected to the cold end outlet of the vortex tube, the inlet of the hot runner is connected to the hot end outlet of the vortex tube, and the outlet of the hot runner is connected to the interior of the oil tank.

[0010] Optionally, it also includes:

[0011] A solenoid valve is arranged between the outlet of the hot runner and the oil tank;

[0012] A first pressure transmitter is connected between the solenoid valve and the oil tank and is used to detect the air pressure in the oil tank;

[0013] A control module, the solenoid valve, the first pressure transmitter and the first vacuum pump are all connected to the control module by signal.

[0014] Optionally, it also includes:

[0015] a cyclone separator, wherein the inlet of the cyclone separator is communicated with the outlet of the hot runner, and the liquid outlet of the cyclone separator is communicated with the interior of the oil tank;

[0016] A membrane filter, wherein the inlet of the membrane filter is communicated with the air outlet of the cyclone separator, the first outlet of the membrane filter is communicated with the discharge pipe, and the second outlet of the membrane filter is communicated with the interior of the oil tank.

[0017] Optionally, it also includes:

[0018] a second pressure transmitter, connected and arranged between the cyclone separator and the inlet of the membrane filter;

[0019] The third pressure transmitter is arranged in communication between the second outlet of the membrane filter and the interior of the oil tank.

[0020] Optionally, it also includes:

[0021] The second vacuum pump is connected between the second outlet of the membrane filter and the interior of the oil tank.

[0022] Optionally, it also includes:

[0023] The back pressure valve is connected and arranged between the first outlet of the membrane filter and the discharge pipe.

[0024] Optionally, it also includes:

[0025] The concentration sensor is arranged between the first outlet of the membrane filter and the discharge pipe.

[0026] Optionally, a first temperature sensor is provided on the discharge pipe to detect the temperature of the discharge pipe.

[0027] Optionally, it also includes:

[0028] A flow meter is provided to communicate with the first vacuum pump and the interior of the oil tank.

[0029] Optionally, it also includes:

[0030] The second temperature sensor is arranged on the oil tank and is used to detect the temperature inside the oil tank.

[0031] The technical solution provided by this application may have the following beneficial effects:

[0032] The present specific embodiment provides a tertiary oil and gas recovery device, comprising: a first vacuum pump, a vortex tube and a heat exchanger, wherein a cold runner and a hot runner are arranged in the heat exchanger. The inlet of the first vacuum pump is connected to the outlet on the oil tank through a pipeline, and the outlet of the first vacuum pump is connected to the inlet of the vortex tube through a pipeline. One end of the cold runner of the heat exchanger is closed, and the other end is connected to the cold end outlet of the vortex tube. The first end of the hot runner of the heat exchanger is connected to the hot end outlet of the vortex tube, and the second end of the hot runner of the heat exchanger is connected to the inlet of the oil tank 1. When the pressure in the oil tank is too high, the first vacuum pump is used to extract and pressurize the oil and gas in the oil tank, and then the compressed high-pressure oil and gas are discharged into the vortex tube. After passing through the vortex tube, the high-pressure oil and gas are divided into cold oil and gas discharged from the cold end outlet and hot oil and gas discharged from the hot end outlet. At this time, the oil and gas discharged from the hot end outlet can reach about 80°C. The cold oil and gas discharged from the cold end outlet exchanges heat with the air in the cold runner, so that the gas temperature in the cold runner can be reduced to about 0 degrees ℃. When the oil and gas discharged from the hot end outlet passes through the hot runner, they exchange heat with the cold runner, causing part of the oil and gas to cool down and liquefy in the hot runner. The liquefied oil and the unliquefied oil and gas are discharged from the second end of the hot runner and returned to the oil tank. Since the pressure decreases after liquefaction, the pressure in the oil tank decreases. Compared with completely relying on membrane filters for pressurization, the cost is lower, and compared with using activated carbon adsorption, no waste is generated, secondary pollution is avoided, and high-frequency maintenance is not required.

[0033] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0035] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 is a schematic diagram of a tertiary oil and gas recovery device according to some exemplary embodiments;

[0037] Figure 2 is a schematic diagram of another tertiary oil and gas recovery device according to some exemplary embodiments;

[0038] Figure 3 is a schematic structural diagram of a heat exchanger according to some exemplary embodiments.

[0039] In the figure: 1. oil tank; 2. flow meter; 3. first vacuum pump; 4. vortex tube; 5. heat exchanger; 51. cold runner; 52. hot runner; 6. cyclone separator; 7. second pressure transmitter; 8. membrane filter; 9. third pressure transmitter; 10. second vacuum pump; 11. solenoid valve; 12. first pressure transmitter; 13. back pressure valve; 14. concentration sensor; 15. discharge pipe. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the utility model.

[0041] The following is an explanation of the embodiments with reference to the accompanying drawings. In addition, the embodiments shown below do not limit the contents of the utility model described in the claims. In addition, the entire contents of the structures represented by the following embodiments are not limited to the solutions required as the utility model described in the claims.

[0042] refer to Figure 1-3 This specific embodiment provides a tertiary oil and gas recovery device, including: a first vacuum pump 3, a vortex tube 4 and a heat exchanger 5.

[0043] The vortex tube 4 is a commonly used device, which has an inlet, a cold end outlet and a hot end outlet. After the compressed air is injected into the vortex chamber of the vortex tube 4 from the inlet, the airflow rotates at a speed of up to one million revolutions per minute to flow to the hot end outlet of the vortex tube. A part of the airflow flows out through the control valve, and the remaining gas is blocked and rotates in the opposite direction at the same speed in the inner circle of the original airflow and flows to the cold end outlet of the vortex tube 4. In this process, the two airflows exchange heat, the inner ring airflow becomes very cold and flows out from the cold end outlet of the vortex tube 4, and the outer ring airflow becomes very hot and flows out from the hot end outlet of the vortex tube 4.

[0044] A cold runner 51 and a hot runner 52 are arranged in the heat exchanger 5. The cold runner 51 and the hot runner 52 are arranged in parallel and can exchange heat with each other. The first end of the cold runner 51 is closed, and the second end of the cold runner 51 is connected to the cold end outlet of the vortex tube 4 through a pipeline. The first end of the hot runner 52 is connected to the hot end outlet of the vortex tube through a pipeline.

[0045] The first vacuum pump 3 has an inlet and an outlet. After the fluid enters from the inlet of the first vacuum pump 3, the first vacuum pump 3 compresses the fluid and then pumps it to the outlet. The oil tank 1 is provided with an outlet and an inlet. The inlet of the first vacuum pump 3 is connected to the outlet on the oil tank 1 through a pipeline, the outlet of the first vacuum pump 3 is connected to the inlet of the vortex tube 4 through a pipeline, and the inlet of the oil tank 1 is connected to the second end of the hot end outlet of the vortex tube through a pipeline.

[0046] In this way, when the pressure in the oil tank 1 is too high, the first vacuum pump 3 is used to extract and pressurize the oil and gas in the oil tank 1, and then the compressed high-pressure oil and gas are discharged into the vortex tube 4. After passing through the vortex tube 4, the high-pressure oil and gas are divided into cold oil and gas discharged from the cold end outlet and hot oil and gas discharged from the hot end outlet. At this time, the oil and gas discharged from the hot end outlet can reach about 80°C. The cold oil and gas discharged from the cold end outlet exchange heat with the air in the cold runner 51, so that the gas temperature in the cold runner 51 can be reduced to about 0 degrees. When the oil and gas discharged from the hot end outlet passes through the hot runner 52, it exchanges heat with the cold runner 51, so that part of the oil and gas is cooled and liquefied in the hot runner 52. The liquefied oil and the unliquefied oil and gas are discharged from the second end of the hot runner 52 and return to the oil tank 1. Since the pressure is reduced after liquefaction, the pressure in the oil tank 1 is reduced. Compared with completely relying on membrane filters for pressurization, the cost is lower, and compared with using activated carbon adsorption, no waste is generated, secondary pollution is avoided, and high-frequency maintenance is not required. And no substances are discharged to the outside, achieving zero emissions.

[0047] The first vacuum pump 3 may be connected to a control module, and the control module may be a PLC, and the PLC is used to control the start and stop of the first vacuum pump 3 .

[0048] As an optional implementation, it also includes: a solenoid valve 11 and a first pressure transmitter 12, the solenoid valve is connected and arranged on the pipeline between the outlet of the hot runner 52 and the oil tank 1, and then the first pressure transmitter 12 is connected and arranged on the pipeline between the solenoid valve 11 and the oil tank 1. The solenoid valve 11 and the first pressure transmitter 12 are connected to the PLC signal.

[0049] In this way, the first pressure transmitter 12 can monitor the real-time pressure in the oil tank 1. When the pressure in the oil tank 1 reaches a preset value, a signal is sent to the PLC, and the PLC sends a control signal to start the first vacuum pump 3. The PLC controls the solenoid valve 11 to open, and the liquefied oil and the unliquefied oil gas are discharged from the second end of the hot runner 52 and can return to the oil tank 1. This arrangement realizes automatic control and saves labor.

[0050] The PLC control mode of the solenoid valve 11 can be set to open after a specified time and close after a specified time, thereby increasing the retention time of the oil and gas in the hot runner 52 and achieving a better liquefaction effect.

[0051] The display can also be set to display the value detected by the first pressure transmitter in real time for easy observation.

[0052] As an optional embodiment, it also includes: a cyclone separator 6 and a membrane filter 8. The cyclone separator 6 is a commonly used gas-liquid separation device. It has an inlet, a gas outlet and a liquid outlet. After the oil-gas mixture enters the cyclone separator 6 from the inlet, the cyclone separator 6 separates the gas and liquid, and the gas is discharged from the gas outlet and the liquid is discharged from the liquid outlet.

[0053] The membrane filter 8 is a commonly used gas pressure filtration device, which has an inlet, a first outlet and a second outlet. After the gas enters the membrane filter from the inlet, a part of the gas is filtered to meet a certain standard and is discharged from the first outlet, and the other part of the filtered gas is discharged from the second outlet.

[0054] The outlet of the hot runner 52 is first connected to the inlet of the cyclone separator 6 through a pipeline, and then the liquid outlet of the cyclone separator 6 is connected to the inlet of the oil tank 1 through a pipeline, the gas outlet of the cyclone separator 6 is connected to the inlet of the membrane filter 8 through a pipeline, the first outlet of the membrane filter 8 is connected to the discharge pipe 15 through a pipeline, and the second outlet of the membrane filter 8 is connected to the inlet of the oil tank 1.

[0055] After the oil-gas mixture flowing out from the second end of the hot runner 52 enters the cyclone separator 6, the cyclone separator 6 separates the oil and gas, and the separated oil returns to the oil tank 1 through the pipeline. The separated oil and gas enter the membrane filter 8, and the membrane filter 8 filters the oil and gas. The gas that meets the standards after filtration is discharged from the first outlet to the discharge pipe 15 and then directly discharged, and the filtered oil and gas returns to the oil tank 1 through the pipeline from the second outlet.

[0056] In this way, the oil and gas in the oil and gas mixture flowing out of the second end of the hot runner 52 is filtered and discharged partially, reducing the volume of the oil and gas returning to the oil tank 1, thereby further reducing the pressure of the oil tank 1.

[0057] It is worth noting that although the membrane filter 8 is used, most of the oil and gas have been liquefied into oil and returned to the oil tank 1, and only a small part of the oil and gas remains unliquefied. The membrane filter 8 only needs to filter a small amount of oil and gas. Compared with relying entirely on the membrane filter 8 to filter the oil and gas, the loss of the membrane filter 8 is greatly reduced and the cost is lower.

[0058] As an optional embodiment, it also includes: a second pressure transmitter 7 and a third pressure transmitter 9. The second pressure transmitter 7 is connected and arranged on the pipeline between the cyclone separator 6 and the inlet of the membrane filter 8, so that the second pressure transmitter 7 can detect the pressure of the oil and gas entering the membrane filter 8. The third pressure transmitter 9 is connected and arranged on the pipeline between the second outlet of the membrane filter 8 and the inlet of the oil tank 1, so that the third pressure transmitter 9 can detect the pressure of the oil and gas discharged from the second outlet of the membrane filter 8. The second pressure transmitter 7 and the third pressure transmitter 9 are connected to the control module signal, and the display is connected to the control module signal. The display can display the values ​​detected by the second pressure transmitter 7 and the third pressure transmitter 9 in real time, which is convenient for detecting the working state of the membrane filter 8.

[0059] Furthermore, a second vacuum pump 10 is arranged on the pipeline between the second outlet of the membrane filter 8 and the inlet of the oil tank 1 , and the suction of the second vacuum pump 10 provides separation power for the operation of the membrane filter 8 .

[0060] Furthermore, a back pressure valve 13 is provided on the pipeline between the first outlet of the membrane filter 8 and the discharge pipe 15 so that the gas discharged from the first outlet of the membrane filter 8 can flow to the discharge pipe 15 only after reaching a certain pressure, thereby ensuring the working pressure requirement for the membrane filter 8 .

[0061] In some embodiments, a concentration sensor 14 is provided on the pipeline between the first outlet of the membrane filter 8 and the discharge pipe 15, and the concentration sensor 14 is used to detect the concentration of oil and gas in the gas entering the discharge pipe 15. The concentration sensor 14 is connected to the control module signal, and the display is connected to the control module signal. The display can display the value detected by the concentration sensor 14 in real time, so as to facilitate monitoring whether the exhaust gas meets the standard.

[0062] In some embodiments, a first temperature sensor is provided on the exhaust pipe 15 so that the first temperature sensor can detect the temperature of the gas entering the exhaust pipe 15, the first temperature sensor is connected to the control module signal, and the display is connected to the control module signal. The display can display the value detected by the first temperature sensor in real time, so as to facilitate monitoring the temperature of the exhaust gas.

[0063] As an optional implementation, a flow meter 2 is provided on the pipeline between the first vacuum pump 3 and the inlet of the oil tank 1, and the flow meter 2 can detect the flow rate of the oil and gas passing through. The flow meter 2 is connected to the control module signal, and the display is connected to the control module signal. The display can display the value detected by the flow meter 2 in real time, which is convenient for monitoring the flow rate of the oil and gas discharged from the outlet of the oil tank 1.

[0064] As an optional implementation, a second temperature sensor is provided at the outlet of the oil tank 1, and the second temperature sensor is used to detect the temperature inside the oil tank 1. The second temperature sensor is connected to the control module signal, and the display is connected to the control module signal. The display can display the value detected by the second temperature sensor in real time, so as to facilitate monitoring the temperature of the gas discharged from the outlet of the oil tank 1.

[0065] It should be noted that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. used herein to indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0066] In the description of this article, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to the specific circumstances.

[0067] Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and cannot be construed as limitations of the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application. It is understood that the same or similar parts in the above embodiments may refer to each other, and the contents not described in detail in some embodiments may refer to the same or similar contents in other embodiments. The multiple schemes provided in the present application include the basic schemes themselves, which are independent of each other and do not restrict each other, but they may also be combined with each other without conflict to achieve a plurality of effects to be realized together.

Claims

1. A tertiary oil and gas recovery device, characterized in that: include: a first vacuum pump (3), wherein an inlet of the first vacuum pump (3) is connected to the interior of the oil tank (1); a vortex tube (4), wherein the inlet of the vortex tube (4) is connected to the outlet of the first vacuum pump (3); A heat exchanger (5), wherein a cold runner (51) and a hot runner (52) are arranged in the heat exchanger (5), wherein the cold runner (51) is connected to the cold end outlet of the vortex tube (4), the inlet of the hot runner (52) is connected to the hot end outlet of the vortex tube (4), and the outlet of the hot runner (52) is connected to the interior of the oil tank (1).

2. The tertiary oil and gas recovery device according to claim 1, characterized in that: Also includes: A solenoid valve (11) is arranged to communicate between the outlet of the hot runner (52) and the oil tank (1); a first pressure transmitter (12), which is arranged in communication between the solenoid valve (11) and the oil tank (1) and is used to detect the air pressure in the oil tank (1); A control module, the solenoid valve (11), the first pressure transmitter (12) and the first vacuum pump (3) are all signal-connected to the control module.

3. The tertiary oil and gas recovery device according to claim 1, characterized in that: Also includes: a cyclone separator (6), wherein the inlet of the cyclone separator (6) is in communication with the outlet of the hot runner (52), and the liquid outlet of the cyclone separator (6) is in communication with the interior of the oil tank (1); A membrane filter (8), wherein the inlet of the membrane filter (8) is connected to the air outlet of the cyclone separator (6), the first outlet of the membrane filter (8) is connected to the discharge pipe (15), and the second outlet of the membrane filter (8) is connected to the interior of the oil tank (1).

4. The tertiary oil and gas recovery device according to claim 3, characterized in that: Also includes: a second pressure transmitter (7) connected and arranged between the inlet of the cyclone separator (6) and the membrane filter (8); A third pressure transmitter (9) is arranged to communicate between the second outlet of the membrane filter (8) and the interior of the oil tank (1).

5. The tertiary oil and gas recovery device according to claim 3, characterized in that: Also includes: A second vacuum pump (10) is arranged to communicate between the second outlet of the membrane filter (8) and the interior of the oil tank (1).

6. The tertiary oil and gas recovery device according to claim 3, characterized in that: Also includes: A back pressure valve (13) is arranged to communicate between the first outlet of the membrane filter (8) and the discharge pipe (15).

7. The tertiary oil and gas recovery device according to claim 3, characterized in that: Also includes: A concentration sensor (14) is arranged in communication between the first outlet of the membrane filter (8) and the discharge pipe (15).

8. The tertiary oil and gas recovery device according to claim 3, characterized in that: A first temperature sensor is arranged on the discharge pipe (15) and is used to detect the temperature of the discharge pipe (15).

9. The tertiary oil and gas recovery device according to claim 1, characterized in that: Also includes: A flow meter (2) is arranged to communicate with the first vacuum pump (3) and the interior of the oil tank (1).

10. The tertiary oil and gas recovery device according to claim 1, characterized in that: Also includes: A second temperature sensor is arranged on the oil tank (1) and is used to detect the temperature inside the oil tank (1).

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