Oil storage container residual oil collection and recovery system

Abstract

This invention belongs to the field of residual oil collection and recovery technology for oil storage containers, specifically relating to a residual oil collection and recovery system for oil storage containers. The system includes an oil storage container, a gas-liquid centrifugal separator, a gas-liquid sedimentation separator, an oil recovery tank, a vacuum compressor, and an oil-gas separator. The oil storage container is equipped with an atmospheric air supply valve and an oil discharge valve. An oil suction head is located at the bottom inner side of the oil storage container, and an oil discharge pipe connects the oil suction head and the oil discharge valve. The residual oil collection and recovery system of this invention utilizes the airflow above the external oil suction cylinder to carry the bottom oil for recovery. The oil suction head does not adhere to the bottom wall of the oil storage container, resulting in good operational stability. It can remove both the bottom oil and oil-gas in the container, achieving a high oil recovery rate. Throughout the entire process of removing the bottom oil and oil-gas, there is no gas leakage from the oil storage container, making it safe and environmentally friendly.

Description

Technical Field

[0001] This invention relates to a residual oil collection and recovery system for oil storage containers, belonging to the technical field of residual oil collection and recovery for oil storage containers. Background Technology

[0002] Oil storage containers typically require regular cleaning during use. Environmental regulations dictate that cleaning oil storage containers should minimize the discharge of oily wastewater; therefore, residual oil must be completely drained from the container before water cleaning. Traditionally, a self-draining method with an oil drain port at the bottom of the container is used. However, this method relies on the container's own flow for drainage, resulting in incomplete oil removal.

[0003] To address this, Chinese utility model patent application number 202220285472.6 discloses a portable vacuum oil storage tank bottom oil recovery device. Its working principle involves using a vacuum pump to create a vacuum zone at the bottom oil suction head, thereby drawing the bottom oil from the bottom of the storage tank into the bottom oil recovery container under atmospheric pressure, thus achieving the purpose of cleaning and recovering the residual oil in the storage tank.

[0004] However, in actual use, because the bottom oil suction head needs to be inserted into the inner bottom of the oil storage tank, the oil storage tank is in an open state. This causes the saturated oil vapors volatilized in the oil storage tank to be released into the atmosphere, which not only pollutes the atmospheric environment but also wastes oil. In addition, during the extraction process, the bottom oil suction head is easy to be adsorbed on the bottom wall of the oil storage tank, which affects the normal extraction of oil. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a safe, environmentally friendly, high-recovery-rate, and stable oil storage container residual oil collection and recovery system.

[0006] The oil storage container residual oil collection and recovery system of the present invention includes an oil storage container, a gas-liquid centrifugal separator, a gas-liquid sedimentation separator, an oil recovery tank, a vacuum compressor, and an oil-gas separator. The oil storage container is equipped with an atmospheric air supply valve and an oil discharge valve. An oil suction head is located at the bottom inner side of the oil storage container. The oil suction head includes an outer oil suction cylinder with an open top and a closed bottom. An oil discharge port is located at the bottom of the outer oil suction cylinder. An inner oil suction cylinder is connected to the inner side of the outer oil suction cylinder. An exhaust hole corresponding to the oil discharge port is located at the lower end of the inner oil suction cylinder. An oil discharge pipe is connected between the upper end of the inner oil suction cylinder and the oil discharge valve. The oil discharge valve is connected to the air inlet of the gas-liquid sedimentation separator. A first air pipe connects the gas-liquid sedimentation separator to the gas inlet of the vacuum compressor. A second air pipe connects the gas outlet of the vacuum compressor to the gas inlet of the oil-gas separator. An exhaust pipe is connected to the gas outlet of the oil-gas separator. A fourth air pipe connects the oil discharge valve to the gas inlet of the gas-liquid centrifugal separator. A fifth air pipe connects the gas outlet of the gas-liquid centrifugal separator to the gas inlet of the gas-liquid sedimentation separator. The liquid outlets of both the gas-liquid sedimentation separator and the gas-liquid centrifugal separator are connected to an oil recovery tank. A first on / off valve and a second on / off valve are connected to the first and fourth air pipes, respectively.

[0007] Preferably, the oil storage container is equipped with a circulating air supply valve, a circulating air supply pipe is connected between the circulating air supply valve and the exhaust pipe, and an exhaust valve is provided on the exhaust pipe.

[0008] Preferably, the second air pipe is equipped with a one-way valve.

[0009] Preferably, the above-mentioned one-way valve is a self-operated check valve.

[0010] Preferably, the bottom of the oil-gas separator is provided with a first oil recovery valve.

[0011] Preferably, a second oil recovery valve is provided at the bottom of the oil recovery tank.

[0012] Preferably, a working fluid circulation pipe is connected between the liquid outlet of the oil-gas separator and the working fluid inlet of the vacuum compressor, and a cooler is provided on the working fluid circulation pipe.

[0013] Preferably, a cooling fan is provided at the aforementioned cooler.

[0014] Preferably, the system also includes a frame, and the gas-liquid centrifugal separator, gas-liquid sedimentation separator, oil recovery tank, vacuum compressor, oil-gas separator, cooler and radiator are all integrated on the frame.

[0015] The beneficial effects of this invention compared to the prior art are:

[0016] First, this system uses the airflow above the external oil suction cylinder to carry the bottom oil to recover the residual oil. The oil suction head will not stick to the bottom wall of the oil storage container, and the working stability is good.

[0017] Secondly, this system can extract both bottom oil and oil vapor in the container, resulting in a high oil recovery rate.

[0018] Third, this system will not cause gas leakage in the oil storage container during the extraction of oil and gas and bottom oil, making it safe and environmentally friendly. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention;

[0020] Figure 2 yes Figure 1 Cross-sectional view of the middle oil suction head.

[0021] In the diagram: 1. Oil storage container; 2. Oil suction head; 3. Oil discharge pipe; 4. Oil recovery tank; 5. Working fluid circulation pipe; 6. Cooler; 7. Chassis; 8. Second oil recovery valve; 9. First oil recovery valve; 10. Oil-gas separator; 11. Radiator fan; 12. Vacuum compressor; 13. Third air pipe; 14. Check valve; 15. Second air pipe; 16. Exhaust pipe; 17. Exhaust valve; 18. Circulation air supply pipe; 19. Gas-liquid sedimentation separator; 20. Fifth air pipe; 21. Gas-liquid centrifugal separator; 22. First air pipe; 23. First on / off valve; 24. Fourth air pipe; 25. Second on / off valve; 26. Oil discharge valve; 27. Circulation air supply valve; 28. Atmospheric air supply valve; 29. ​​Inner oil suction cylinder; 30. Oil discharge port; 31. Exhaust hole; 32. Outer oil suction cylinder. Detailed Implementation

[0022] The embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0023] Example 1:

[0024] like Figure 1 , Figure 2As shown, the residual oil collection and recovery system of the oil storage container of the present invention includes an oil storage container 1, a gas-liquid centrifugal separator 21, a gas-liquid sedimentation separator 19, an oil recovery tank 4, a vacuum compressor 12, and an oil-gas separator 10. The oil storage container 1 is equipped with an atmospheric air supply valve 28 and an oil discharge valve 26. An oil suction head 2 is placed at the bottom of the inner side of the oil storage container 1. The oil suction head 2 includes an outer oil suction cylinder 32 with an open top and a closed bottom. An oil discharge port 30 is provided at the bottom of the outer oil suction cylinder 32. An inner oil suction cylinder 29 is connected to the inner side of the outer oil suction cylinder 32. An exhaust hole 31 corresponding to the oil discharge port 30 is provided at the lower end of the inner oil suction cylinder 29. An oil discharge pipe 3 is connected between the upper end of the inner oil suction cylinder 29 and the oil discharge valve 26. The oil discharge valve 26 is connected to the air inlet of the gas-liquid sedimentation separator 19. A first air pipe 22 is connected between the outlets of the gas-liquid sedimentation separator 19 and the inlet of the vacuum compressor 12. A second air pipe 15 is connected between the outlet of the vacuum compressor 12 and the inlet of the oil-gas separator 10. An exhaust pipe 16 is connected to the outlet of the oil-gas separator 10. A fourth air pipe 24 is connected between the oil discharge valve 26 and the inlet of the gas-liquid centrifugal separator 21. A fifth air pipe 20 is connected between the outlet of the gas-liquid centrifugal separator 21 and the inlet of the gas-liquid sedimentation separator 19. The liquid outlets of both the gas-liquid sedimentation separator 19 and the gas-liquid centrifugal separator 21 are connected to the oil recovery tank 4. A first on / off valve 23 and a second on / off valve 25 are respectively connected to the first air pipe 22 and the fourth air pipe 24.

[0025] In operation, the oil discharge valve 26 and the second on / off valve 25 are opened, and the first on / off valve 23 is closed. The vacuum compressor 12 operates, generating airflow at the upper port of the external oil suction cylinder 32. The oil vapor in the oil storage container 1 enters the external oil suction cylinder 32 with the airflow, and then enters the internal oil suction cylinder 29 through the exhaust port 31. At the same time, the bottom oil in the oil storage container 1 also enters the internal oil suction cylinder 29 through the oil discharge port 30. Then, the bottom oil and oil vapor, along with the airflow, sequentially pass through the internal oil suction cylinder 29, the oil discharge pipe 3, the oil discharge valve 26, and the fourth air pipe 24 into the gas-liquid centrifugal separator 21. Under the action of the gas-liquid centrifugal separator 21, most of the oil is collected in the oil recovery tank 4, and a small portion of the oil, along with the airflow, enters the gas-liquid settling separator 19 through the fifth air pipe 20. Under the action of the gas-liquid settling separator 19, the gas... The oil carried in the flow is collected in the oil recovery tank 4, and then the oil vapor enters the vacuum compressor 12 through the second gas pipe 15. After being compressed by the vacuum compressor 12, the oil vapor enters the oil-gas separator 10. Under the action of the oil-gas separator 10, the oil in the gas flow is collected, and the gas is discharged to the external receiving point through the exhaust pipe 16. When the bottom oil is completely removed, the first on-off valve 23 is opened and the second on-off valve 25 is closed. The oil vapor in the oil storage container 1 enters the gas-liquid sedimentation separator 19 through the oil suction head 2, the oil discharge pipe 3, the oil discharge valve 26 and the first gas pipe 22 in sequence. Similarly, the oil is collected and the gas is discharged. When the gas pressure in the oil storage container 1 decreases due to extraction, the external atmosphere can enter the oil storage container 1 through the atmospheric air supply valve 28 to provide the required airflow for the vacuum compressor 12.

[0026] The beneficial effects of this invention compared to the prior art are:

[0027] First, this system uses the airflow above the external oil suction cylinder 32 to carry the bottom oil to recover the residual oil, and the oil suction head 2 will not be adsorbed on the bottom wall of the oil storage container 1, so the working stability is good.

[0028] Secondly, this system can extract both bottom oil and oil vapor in the container, resulting in a high oil recovery rate.

[0029] Third, this system will not cause gas leakage in the oil storage container 1 during the oil and gas extraction and bottom oil extraction processes, making it safe and environmentally friendly.

[0030] Example 2:

[0031] like Figure 1 , Figure 2 As shown, based on Example 1,

[0032] Preferably, the oil storage container 1 is provided with a circulation air supply valve 27, and a circulation air supply pipe 18 is connected between the circulation air supply valve 27 and the exhaust pipe 16. An exhaust valve 17 is provided on the exhaust pipe 16. By opening the circulation air supply valve 27 and closing the exhaust valve 17, the gas separated by the oil-gas separator 10 can enter the oil storage container 1 in sequence through the exhaust pipe 16, the circulation air supply pipe 18 and the circulation air supply valve 27, forming an internal gas circulation, so that there is no need for external atmospheric replenishment, making the operation safer and more reliable.

[0033] Preferably, the second gas pipe 15 is provided with a one-way valve 14 to prevent oil and gas from flowing back into the gas-liquid sedimentation separator 19, thus providing a protective function.

[0034] Preferably, the one-way valve 14 is a self-operated check valve, which does not require external power and reduces energy consumption.

[0035] Preferably, the bottom of the oil-gas separator 10 is provided with a first oil recovery valve 9. When the oil level in the oil-gas separator 10 reaches a certain height, the oil in the oil-gas separator 10 can be released and recovered by opening the first oil recovery valve 9.

[0036] Preferably, the bottom of the oil recovery tank 4 is provided with a second oil recovery valve 8. When the oil level in the oil recovery tank 4 reaches a certain height, the oil in the oil recovery tank 4 can be released and recovered by opening the second oil recovery valve 8.

[0037] Preferably, a working fluid circulation pipe 5 is connected between the liquid outlet of the oil-gas separator 10 and the working fluid inlet of the vacuum compressor 12. A cooler 6 is provided on the working fluid circulation pipe 5, so that the oil separated by the oil-gas separator 10 can be cooled by the cooler 6 and then enter the vacuum compressor 12 through the working fluid circulation pipe 5 to be recycled as the working fluid of the vacuum compressor 12, thus eliminating the need to consume other external power.

[0038] Preferably, a cooling fan 11 is provided at the aforementioned cooler 6, which is beneficial to improving the cooling effect of the cooler 6;

[0039] Preferably, the system also includes a frame 7, and the gas-liquid centrifugal separator 21, gas-liquid sedimentation separator 19, oil recovery tank 4, vacuum compressor 12, oil-gas separator 10, cooler 6 and radiator fan 11 are all integrated on the frame 7, which facilitates the transfer of the system between different locations and makes it more widely applicable.

Claims

1. A residual oil collection and recovery system for an oil storage container, characterized in that: The system includes an oil storage container (1), a gas-liquid centrifugal separator (21), a gas-liquid settling separator (19), an oil recovery tank (4), a vacuum compressor (12), and an oil-gas separator (10). The oil storage container (1) is equipped with an atmospheric air supply valve (28) and an oil discharge valve (26). An oil suction head (2) is located at the bottom of the inner side of the oil storage container (1). The oil suction head (2) includes an outer oil suction cylinder (32) with an open top and a closed bottom. An oil discharge port (30) is located at the bottom of the outer oil suction cylinder (32). An inner oil suction cylinder (29) is connected to the inner side of the outer oil suction cylinder (32). An exhaust hole (31) corresponding to the oil discharge port (30) is located at the lower end of the inner oil suction cylinder (29). An oil discharge pipe (3) is connected between the upper end of the inner oil suction cylinder (29) and the oil discharge valve (26). A first air supply pipe (3) is connected between the oil discharge valve (26) and the air inlet of the gas-liquid settling separator (19). A second air pipe (15) is connected between the outlet of the gas-liquid sedimentation separator (19) and the inlet of the vacuum compressor (12). A third air pipe (13) is connected between the outlet of the vacuum compressor (12) and the inlet of the oil-gas separator (10). An exhaust pipe (16) is connected to the outlet of the oil-gas separator (10). A fourth air pipe (24) is connected between the oil discharge valve (26) and the inlet of the gas-liquid centrifugal separator (21). A fifth air pipe (20) is connected between the outlet of the gas-liquid centrifugal separator (21) and the inlet of the gas-liquid sedimentation separator (19). The outlets of the gas-liquid sedimentation separator (19) and the gas-liquid centrifugal separator (21) are both connected to the oil recovery tank (4). A first on / off valve (23) and a second on / off valve (25) are respectively connected to the first air pipe (22) and the fourth air pipe (24).

2. The residual oil collection and recovery system for oil storage containers according to claim 1, characterized in that: The oil storage container (1) is equipped with a circulation air supply valve (27), and a circulation air supply pipe (18) is connected between the circulation air supply valve (27) and the exhaust pipe (16). An exhaust valve (17) is provided on the exhaust pipe (16).

3. The residual oil collection and recovery system for oil storage containers according to claim 1, characterized in that: The second air pipe (15) is equipped with a one-way valve (14).

4. The residual oil collection and recovery system for oil storage containers according to claim 3, characterized in that: The one-way valve (14) is a self-operated check valve.

5. The residual oil collection and recovery system for oil storage containers according to claim 1, characterized in that: The bottom of the oil-gas separator (10) is provided with a first oil recovery valve (9).

6. The residual oil collection and recovery system for oil storage containers according to claim 1, characterized in that: The bottom of the oil recovery tank (4) is provided with a second oil recovery valve (8).

7. The residual oil collection and recovery system for oil storage containers according to any one of claims 1 to 6, characterized in that: The outlet of the oil-gas separator (10) is connected to the working fluid inlet of the vacuum compressor (12) by a working fluid circulation pipe (5), and a cooler (6) is provided on the working fluid circulation pipe (5).

8. The residual oil collection and recovery system for oil storage containers according to claim 7, characterized in that: A cooling fan (11) is provided at the cooler (6).

9. The residual oil collection and recovery system for oil storage containers according to claim 8, characterized in that: The system also includes a frame (7), a gas-liquid centrifugal separator (21), a gas-liquid sedimentation separator (19), an oil recovery tank (4), a vacuum compressor (12), an oil-gas separator (10), a cooler (6), and a radiator fan (11), all of which are integrated on the frame (7).

Images