Oil gas condensation recovery device

Abstract

The invention relates to the technical field of environmental protection and energy conservation, in particular to an oil gas condensation recovery device which comprises a base, and a precooler, an oil storage tank, a buffer tank and a cold box are installed at the upper end of the base. An oil-gas separator is mounted in the precooler, and an inlet I, an inlet II, an outlet I and an outlet II are formed in the oil-gas separator; the oil storage tank is provided with a first inlet, a second inlet and an oil outlet, an oil conveying pipe I is installed at the first inlet of the oil storage tank, and the end, away from the oil storage tank, of the oil conveying pipe I penetrates through the precooler to be communicated with an outlet I of the oil-gas separator. The buffer tank is provided with an inlet and an outlet, a gas inlet pipe is mounted at the inlet of the buffer tank, an oil-gas pipe I is mounted at the outlet of the buffer tank, and one end, far away from the buffer tank, of the oil-gas pipe I penetrates through the precooler and is communicated with the inlet I of the oil-gas separator. Compared with the prior art, oil and gas are subjected to secondary cooling and tertiary separation, the oil and gas separation effect is good, and the separation efficiency is high.

Description

Technical Field

[0001] This invention relates to the fields of environmental protection and energy conservation, specifically to an oil and gas condensation recovery device. Background Technology

[0002] Petroleum and its products are mixtures of various hydrocarbon compounds. The volatile components of these compounds are called oil and gas. Oil and gas are mixtures containing various organic hydrocarbon compounds and air. The main components include butane, pentane, benzene, xylene, ethylbenzene, etc., many of which are carcinogenic. Most gas stations, oil depots, oil terminals, oil refineries, and other facilities that easily generate large amounts of oil and gas are located in and around cities. During the unloading and refueling processes, a large amount of oil and gas is emitted. If it is directly released into the atmosphere, it will endanger safe production, pollute the environment, reduce the quality of oil products, and cause economic losses.

[0003] Oil and gas recovery refers to the process of collecting oil and gas volatilized during the storage, transportation, loading and unloading, and refueling of petroleum products (such as gasoline), and using technologies such as adsorption, absorption, and condensation to convert gaseous hydrocarbons into liquid gasoline or reduce their emissions into the atmosphere, thereby achieving the goals of environmental protection, safety, and resource conservation.

[0004] For example, the invention with authorization number CN102465000B discloses an oil and gas condensation recovery method. It uses a gas-liquid two-phase flow pump to simultaneously draw low-temperature refrigerant and oil and gas into the pump body. The gas phase is cut into microbubbles by a high-speed rotating impeller, which increases the gas-liquid contact area and rapidly cools the oil and gas. Under pressure, the oil and gas are transformed into liquid phase in the pump body and pipeline, thereby achieving the purpose of recovering oil and gas resources. The treated non-condensable gas enters the oil and gas post-processing device for further processing, and the refrigerant is recycled.

[0005] The above method, when condensing and recovering oil and gas, still requires pumping the oil and gas into the pump body to disperse and cool it down even when some of the oil and gas is converted into liquid. It cannot flexibly handle the mixed oil and gas. Moreover, during the cooling process, it is necessary to add a heat exchanger to the mixed oil and gas for heat exchange and then perform three-phase separation, which increases the oil and gas processing process and makes the separation steps of the mixed oil and gas more complicated.

[0006] Therefore, based on the above problems, we have invented an oil and gas condensation recovery device. Summary of the Invention

[0007] In view of the shortcomings of the prior art, the present invention provides an oil and gas condensation recovery device to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: An oil and gas condensation recovery device includes a base, and a precooler, an oil storage tank, a buffer tank, and a cold box are respectively installed on the upper end of the base; The precooler is equipped with an oil-gas separator, which has inlet I, inlet II, outlet I and outlet II. It should be noted that the precooler is used to precool the oil-gas mixture, initially reducing the temperature of the oil and gas. The oil storage tank is provided with one inlet, two inlets and an oil outlet. An oil pipeline I is installed at one inlet of the oil storage tank. The end of the oil pipeline I away from the oil storage tank passes through the precooler and is connected to the outlet I of the oil-gas separator. It should be noted that the oil storage tank is used for temporary storage of the oil after separation. The buffer tank is provided with an inlet and an outlet. An air inlet pipe is installed at the inlet of the buffer tank, and an oil-gas pipe I is installed at the outlet of the buffer tank. The end of the oil-gas pipe I away from the buffer tank passes through the precooler and is connected to the inlet I of the oil-gas separator. It should be noted that the buffer tank is used for temporary storage of oil and gas at higher temperatures to ensure that the gas pressure is stable when the oil and gas is subsequently drawn into the oil-gas separator by the explosion-proof fan. The cold box is equipped with an air inlet, an upper outlet, and a lower outlet. An air guide pipe is installed on the air inlet. The end of the air guide pipe away from the cold box passes through the precooler and connects to the outlet II of the oil-gas separator. A return air pipe is installed at the upper outlet of the cold box. The end of the return air pipe away from the cold box passes through the precooler and connects to the inlet II of the oil-gas separator. An oil delivery pipe II is installed at the lower outlet of the cold box. The end of the oil delivery pipe II away from the cold box connects to the two inlets of the oil storage tank.

[0009] It should be noted that the cold box is used to lower the temperature of the oil-gas mixture, thereby separating the oil and gas. Furthermore, an oil outlet pipe is installed at the oil outlet of the oil storage tank, and an oil pump is installed on the base. The oil outlet pipe is connected to the oil pump's suction port, and the oil outlet pipe is used to extract oil from the oil storage tank.

[0010] Furthermore, an explosion-proof fan is installed on the oil and gas pipe I, which transports the mixed oil and gas to the precooler.

[0011] Furthermore, the cold box includes a box body, a temporary storage box is installed inside the box body, a return gas pipe passes through the box body and is connected to the temporary storage box, an oil supply pipe II passes through the box body and is connected to the temporary storage box, a vent pipe passes through the box body and is connected to the temporary storage box, and a cooling pipe is fixedly wound around the outside of the temporary storage box. Both ends of the cooling pipe are provided through the box body, and the cooling pipe is supplied with coolant through an external refrigerator.

[0012] It should be noted that by cooling the temporary storage tank with flowing coolant, the temporary storage tank is kept at a low and stable temperature. When cooling the oil and gas, it is ensured that the oil and gas temperature can be reduced to the specified temperature. Furthermore, flame arresters are installed on both the air inlet pipe and the air outlet pipe to prevent flames from flowing into the air inlet pipe and the air outlet pipe when the openings of the air inlet pipe and the air outlet pipe catch fire.

[0013] Furthermore, the flow of oil in pipeline I, oil in pipeline II, oil-gas pipeline I, return gas pipeline, inlet gas pipeline, outlet gas pipeline, guide gas pipeline, and outlet oil pipeline is all controlled by electric valves.

[0014] An oil and gas condensation and recovery process, the specific steps of which are as follows: S1. Sampling: The mixed oil and gas is drawn into the buffer tank through the intake pipe for temporary storage; S2. Preliminary cooling: The mixed oil and gas temporarily stored in the buffer tank is drawn into the oil and gas separator through the oil and gas pipe I by the explosion-proof fan. During the process of drawing the mixed oil and gas into the oil and gas separator, it passes through the precooler to pre-cool the mixed oil and gas and reduce its temperature. At this time, the pre-cooled mixed oil and gas is separated under the action of the oil and gas separator, with liquefied petroleum sinking and gas rising. S3, Secondary Condensation: The sinking oil is introduced into the oil storage tank for temporary storage through oil pipeline I. The incompletely separated oil and gas mixture is introduced into the cold box through the gas guide pipe. After cooling in the cold box, the oil and gas in the cold box are basically completely separated. At this time, the oil sinks and is introduced into the oil storage tank for temporary storage through oil pipeline II. The gas is introduced into the oil-gas separator for secondary separation through the gas return pipe. S4. Oil-gas separation: After separation, the liquefied petroleum sinks and the gas floats. The liquefied petroleum is introduced into the oil storage tank for temporary storage through the oil pipeline I, while the gas is discharged through the gas outlet pipe. S5. Remove liquefied petroleum: Extract the liquefied petroleum temporarily stored in the oil storage tank using an oil pump.

[0015] Compared with the prior art, the present invention provides an oil and gas condensation recovery device, which has the following beneficial effects: By setting up a precooler and a cold box, the mixed oil and gas are initially cooled by the precooler and initially separated by the oil-gas separator. The unseparated oil and gas are cooled a second time by the cold box, and then separated a second time. The gas after the second separation is reintroduced into the oil-gas separator for a third separation, and then the separated gas is discharged. Through the two-stage cooling of the precooler and cold box, the efficiency of the oil-gas separator is improved. At the same time, the oil and gas are separated three times, which improves the oil-gas separation effect and results in good oil-gas separation effect and high separation efficiency.

[0016] This application involves secondary cooling of oil and gas and tertiary separation of oil and gas, resulting in good oil and gas separation effect and high separation efficiency. Attached Figure Description

[0017] Figure 1 This is a front structural diagram of an oil and gas condensation and recovery device. Figure 2This is a schematic diagram of the rear structure of an oil and gas condensation and recovery device. Figure 3 This is a schematic diagram of the internal structure of a precooler in an oil and gas condensation and recovery device. Figure 4 This is a schematic diagram of the internal structure of the cold box in an oil and gas condensation and recovery device. Figure 5 This is a flowchart of an oil and gas condensation and recovery process.

[0018] In the diagram: 1. Base; 2. Precooler; 3. Oil storage tank; 4. Buffer tank; 5. Cold box; 6. Oil pipeline I; 7. Oil pipeline II; 8. Oil-gas pipeline I; 9. Explosion-proof fan; 10. Return gas pipeline; 11. Oil pump; 12. Temporary storage box; 13. Cooling pipe; 14. Inlet pipe; 15. Outlet pipe; 16. Oil-gas separator; 17. Gas guide pipe; 18. Oil outlet pipe; 19. Box body; 20. Refrigerator. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0020] As described in the background section, there are shortcomings in the existing technology. In order to solve the above-mentioned technical problems, this application proposes an oil and gas condensation recovery device.

[0021] like Figures 1-4 As shown, an oil and gas condensation recovery device includes a base 1, and a precooler 2, an oil storage tank 3, a buffer tank 4, and a cold box 5 are respectively installed on the upper end of the base 1. The precooler 2 is equipped with an oil-gas separator 16, which has inlet I, inlet II, outlet I and outlet II. It should be noted that the precooler 2 performs preliminary cooling of oil and gas at low temperature to reduce the temperature and prepare for subsequent condensation and recovery.

[0022] The oil storage tank 3 is equipped with one inlet, two inlets, and an oil outlet. An oil delivery pipe I6 is installed at one inlet of the oil storage tank 3. The end of the oil delivery pipe I6 away from the oil storage tank 3 passes through the precooler 2 and is connected to the outlet I of the oil-gas separator 16. It should be noted that an oil outlet pipe 18 is installed at the oil outlet of the oil storage tank 3. An oil pump 11 is installed on the base 1. The oil outlet pipe 18 is connected to the oil suction port of the oil pump 11. The oil outlet pipe 18 is used to extract oil from the oil storage tank 3. It should be noted that the oil storage tank 3 is used for temporary storage of liquefied oil products.

[0023] The buffer tank 4 has an inlet and an outlet. An air inlet pipe 14 is installed at the inlet of the buffer tank 4, and an oil and gas pipe I8 is installed at the outlet of the buffer tank 4. It is worth mentioning that an explosion-proof fan 9 is installed on the oil and gas pipe I8. The explosion-proof fan 9 delivers the mixed oil and gas to the precooler 2. The end of the oil and gas pipe I8 away from the buffer tank 4 passes through the precooler 2 and is connected to the inlet I of the oil and gas separator 16. It should be noted that the buffer tank 4 is used to temporarily store the newly entered high-temperature oil and gas, so as to facilitate the subsequent extraction of the mixed oil and gas at a certain rate. The cold box 5 is equipped with an air inlet, an upper outlet, and a lower outlet. An air guide pipe 17 is installed on the air inlet, with the end of the air guide pipe 17 away from the cold box 5 passing through the precooler 2 and connecting to the outlet II of the oil-gas separator 16. A return air pipe 10 is installed at the upper outlet of the cold box 5, with the end of the return air pipe 10 away from the cold box 5 passing through the precooler 2 and connecting to the inlet II of the oil-gas separator 16. An oil delivery pipe II 7 is installed at the lower outlet of the cold box 5, with the end of the oil delivery pipe II 7 away from the cold box 5 connecting to the two inlets of the oil storage tank 3. It should be noted that the cold box 5 includes a box body 19, inside which a temporary storage box 1 is installed. 2. The return gas pipe 10 passes through the box body 19 and is connected to the temporary storage box 12. The oil supply pipe II 7 passes through the box body 19 and is connected to the temporary storage box 12. The gas guide pipe 17 passes through the box body 19 and is connected to the temporary storage box 12. A cooling pipe 13 is fixedly wound around the outside of the temporary storage box 12. Both ends of the cooling pipe 13 are set through the box body 19. The cooling pipe 13 is supplied with coolant through the external cooler 20 and flows inside the cooling pipe 13. It should be noted that the cooling by the external cooler 20 and the circulation into the cold box 5 will perform secondary condensation on the mixed oil and gas introduced into the cold box, so that most of the condensable components are liquefied.

[0024] In this invention, flame arresters are installed on both the intake pipe 14 and the exhaust pipe 15 to prevent flames from flowing into the intake pipe 14 and the exhaust pipe 15 when the openings of the intake pipe 14 and the exhaust pipe 15 catch fire. Furthermore, the flow of oil pipe I 6, oil pipe II 7, oil-gas pipe I 8, return pipe 10, intake pipe 14, exhaust pipe 15, air guide pipe 17, and oil outlet pipe 18 is controlled by electric valves.

[0025] Through the above technical features: During oil-gas separation, oil and gas are introduced from the outside through the inlet pipe 14. First, a flame arrester ensures safety. The oil and gas then enter the buffer tank 4 for temporary storage. Next, the explosion-proof fan 9 guides the oil and gas through the oil-gas pipe I8 into the oil-gas separator 16. During this process, the precooler 2 precools the oil and gas in the separator 16, initially lowering its temperature. At this point, some of the cooled oil and gas is separated by the oil-gas separator 16. The liquid oil is temporarily stored in the oil storage tank 3 through the oil transfer pipe I6, while the unseparated oil and gas... The gas is introduced into the temporary storage box 12 in the cold box 5 through the gas pipe 17. After condensation, part of the oil and gas is separated. The liquid oil is directly introduced into the oil storage tank 3 through the oil pipe II 7 for temporary storage. The oil and gas that are not separated after condensation are then introduced back into the oil-gas separator 16 through the gas return pipe 10. At this time, the oil and gas temperature is low. The oil and gas are fully separated by the oil-gas separator 16. The liquid oil is introduced into the oil storage tank 3 through the oil pipe I 6. The separated gas is discharged through the gas outlet pipe 15 for recycling or high-altitude harmless discharge. The liquid oil stored in the oil storage tank 3 can be extracted by the oil pump 11.

[0026] like Figure 5 As shown, an oil and gas condensation and recovery process includes the following specific steps: S1. Sampling: The mixed oil and gas is drawn into the buffer tank 4 through the air inlet pipe 14 for temporary storage; S2. Preliminary cooling: The mixed oil and gas temporarily stored in the buffer tank 4 is drawn into the oil and gas separator 16 through the oil and gas pipe I8 by the explosion-proof fan 9. During the process of drawing the mixed oil and gas into the oil and gas separator 16, it passes through the precooler 2, which preliminarily cools the mixed oil and gas and lowers its temperature. At this time, the preliminarily cooled mixed oil and gas is separated under the action of the oil and gas separator 16, with liquefied petroleum sinking and gas rising. S3, Secondary Condensation: The sinking oil is introduced into the oil storage tank 3 for temporary storage through the oil pipeline I6. The incompletely separated mixed oil and gas is introduced into the cold box 5 through the gas guide pipe 17. After being cooled by the cold box 5, the oil and gas in the cold box 5 are basically completely separated. At this time, the oil sinks and is introduced into the oil storage tank 3 for temporary storage through the oil pipeline II7. The gas is introduced into the oil-gas separator 16 through the return gas pipe 10 for secondary separation. S4. Oil-gas separation: The separated liquefied petroleum sinks and the gas floats. The liquefied petroleum is introduced into the oil storage tank 3 for temporary storage through the oil pipeline I6, while the gas is discharged through the gas outlet pipe 15. S5. Remove liquefied oil: Extract the liquefied petroleum temporarily stored in the oil storage tank 3 using the oil pump 11.

[0027] Working principle: During oil-gas separation, the oil and gas are introduced from the outside through the inlet pipe 14. First, a flame arrester ensures safety. The oil and gas then enter the buffer tank 4 for temporary storage. Next, the explosion-proof fan 9 guides the oil and gas through the oil-gas pipe I8 into the oil-gas separator 16. During this process, the precooler 2 precools the oil and gas in the separator 16, initially lowering its temperature. At this point, some of the cooled oil and gas is separated by the separator 16. The liquid oil is temporarily stored in the storage tank 3 through the oil delivery pipe I6, while the unseparated oil and gas are separated through the gas guide pipe 1. 7. The oil is introduced into the temporary storage box 12 in the cold box 5. After condensation, some oil and gas are separated. The liquid oil is directly introduced into the oil storage tank 3 for temporary storage through the oil pipeline II 7. The oil and gas that are not separated after condensation are then guided back into the oil-gas separator 16 through the return gas pipeline 10. At this time, the oil and gas temperature is low. The oil and gas are fully separated by the oil-gas separator 16. The liquid oil is introduced into the oil storage tank 3 through the oil pipeline I 6. The separated gas is discharged through the gas outlet pipe 15 for recycling or high-altitude harmless discharge. The liquid oil stored in the oil storage tank 3 can be extracted by the oil pump 11.

Claims

1. An oil and gas condensation and recovery device, characterized in that: Includes a base (1), and a precooler (2), an oil storage tank (3), a buffer tank (4), and a cold box (5) are respectively installed on the upper end of the base (1); The precooler (2) is equipped with an oil-gas separator (16), which has an inlet I, an inlet II, an outlet I and an outlet II. The oil storage tank (3) is provided with one inlet, two inlets and an oil outlet. An oil pipeline I (6) is installed at one inlet of the oil storage tank (3). The end of the oil pipeline I (6) away from the oil storage tank (3) passes through the precooler (2) and is connected to the outlet I of the oil-gas separator (16). The buffer tank (4) is provided with an inlet and an outlet. An air inlet pipe (14) is installed at the inlet of the buffer tank (4), and an oil and gas pipe I (8) is installed at the outlet of the buffer tank (4). The end of the oil and gas pipe I (8) away from the buffer tank (4) passes through the precooler (2) and is connected to the inlet I of the oil and gas separator (16). The cold box (5) is provided with an air inlet, an upper outlet and a lower outlet. An air guide pipe (17) is installed on the air inlet. The end of the air guide pipe (17) away from the cold box (5) passes through the precooler (2) and is connected to the outlet II of the oil-gas separator (16). A return air pipe (10) is installed at the upper outlet of the cold box (5). The end of the return air pipe (10) away from the cold box (5) passes through the precooler (2) and is connected to the inlet II of the oil-gas separator (16). An oil delivery pipe II (7) is installed at the lower outlet of the cold box (5). The end of the oil delivery pipe II (7) away from the cold box (5) is connected to the two inlets of the oil storage tank (3).

2. The oil and gas condensation recovery device according to claim 1, characterized in that: An oil outlet pipe (18) is installed at the oil outlet of the oil storage tank (3), and an oil pump (11) is installed on the base (1). The oil outlet pipe (18) is connected to the oil extraction hole of the oil pump (11). The oil outlet pipe (18) is used to extract oil from the oil storage tank (3).

3. The oil and gas condensation recovery device according to claim 1, characterized in that: An explosion-proof fan (9) is installed on the oil and gas pipe I (8), and the explosion-proof fan (9) delivers the mixed oil and gas to the precooler (2).

4. The oil and gas condensation recovery device according to claim 1, characterized in that: The cold box (5) includes a box body (19), a temporary storage box (12) is installed inside the box body (19), the return gas pipe (10) passes through the box body (19) and is connected to the temporary storage box (12), the oil supply pipe II (7) passes through the box body (19) and is connected to the temporary storage box (12), the air guide pipe (17) passes through the box body (19) and is connected to the temporary storage box (12), and a cooling pipe (13) is fixedly wound around the outside of the temporary storage box (12). Both ends of the cooling pipe (13) are set through the box body (19), and the cooling pipe (13) is supplied with coolant by an external refrigerator to circulate inside the cooling pipe (13).

5. The oil and gas condensation recovery device according to claim 1, characterized in that: Flame arresters are installed on both the air inlet pipe (14) and the air outlet pipe (15) to prevent flames from flowing into the air inlet pipe (14) and the air outlet pipe (15) when the openings of the air inlet pipe (14) and the air outlet pipe (15) are on fire.

6. The oil and gas condensation recovery device according to claim 1, characterized in that: The flow of the oil pipeline I (6), oil pipeline II (7), oil and gas pipeline I (8), return gas pipeline (10), air inlet pipeline (14), air outlet pipeline (15), air guide pipeline (17), and oil outlet pipeline (18) is controlled by electric valves.

7. An oil and gas condensation recovery process, applicable to the oil and gas condensation recovery device according to any one of claims 1-6, characterized in that, The specific steps are as follows: S1. Sampling: The mixed oil and gas is drawn into the buffer tank (4) through the intake pipe (14) for temporary storage; S2, Preliminary cooling: The mixed oil and gas temporarily stored in the buffer tank (4) is drawn into the oil and gas separator (16) through the oil and gas pipe I (8) by the explosion-proof fan (9). During the process of drawing the mixed oil and gas into the oil and gas separator (16), it passes through the precooler (2) to preliminarily cool the mixed oil and gas and reduce its temperature. At this time, the preliminarily cooled mixed oil and gas is separated under the action of the oil and gas separator (16), with liquefied petroleum sinking and gas rising. S3, Secondary Condensation: The sinking oil is introduced into the storage tank (3) through the oil pipeline I (6) for temporary storage. The incompletely separated mixed oil and gas is introduced into the cold box (5) through the gas guide pipe (17). After being cooled by the cold box (5), the oil and gas in the cold box (5) are basically completely separated. At this time, the oil sinks and is introduced into the storage tank (3) through the oil pipeline II (7) for temporary storage. The gas is introduced into the oil-gas separator (16) through the return gas pipe (10) for secondary separation. S4. Oil-gas separation: After separation, the liquefied petroleum sinks and the gas floats. The liquefied petroleum is introduced into the oil storage tank (3) through the oil pipeline I (6) for temporary storage, while the gas is discharged through the gas outlet pipe (15). S5. Remove liquefied oil: Extract the liquefied petroleum temporarily stored in the oil storage tank (3) using the oil pump (11).

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