Zero-discharge closed operation device for normal-pressure oil tank

Abstract

The invention discloses a zero-discharge closed operation device for a normal-pressure oil tank. Comprising a first adsorption cylinder, a second adsorption cylinder, a first program-controlled valve, a second program-controlled valve, a third program-controlled valve, a fourth program-controlled valve, a fifth program-controlled valve, a sixth program-controlled valve, a seventh program-controlled valve, an eighth program-controlled valve, a regenerated gas pipeline, a clean gas pipeline, a first normal-pressure oil tank, a second normal-pressure oil tank and a control cabinet, the zero-emission closed operation device for the normal-pressure oil tank disclosed by the invention operates continuously without interruption, and harmful gases such as volatile organic compounds (VOCs) and the like cannot be exhausted during maintenance; the device is completely sealed, external communication does not exist, and leakage of harmful gases such as volatile organic compounds (VOCs) and the like cannot be caused; the adsorbent can be recycled, and solid waste pollutants are avoided; the equipment can be directly used on a built oil tank, the oil tank does not need to be additionally transformed, the equipment is directly connected with an original vent hole, the pressure in the oil tank can be always kept to be micro-positive pressure in the system operation process, external pressurization or nitrogen sealing measures are not needed, no communication part exists between the oil tank and the outside, and the operation safety of the oil tank can be guaranteed; no waste gas or oil dirt is discharged during operation of the equipment, the whole system is recycled, oil gas is recycled by the equipment and then fed into the oil tank again, and energy waste is avoided.

Description

[0001] This application is a divisional application of the invention patent application with application number CN202010931352.4, application date September 7, 2020, and invention title "A Zero-Emission Sealed Operation Device for Atmospheric Pressure Oil Tanks". Technical Field

[0002] This invention relates to the field of oil and gas recovery, and more particularly to a zero-emission closed-loop operation device for atmospheric pressure oil tanks. Background Technology

[0003] Atmospheric pressure oil tanks have vents that open to the atmosphere, generating waste gas containing large amounts of volatile organic compounds (VOCs) and other harmful substances during operation. Current processes mostly employ adsorption methods to address this waste gas emission, resulting in a huge amount of waste adsorbent that is difficult to treat and pollutes the environment. Therefore, a zero-emission, closed-loop operating device for atmospheric pressure oil tanks is urgently needed. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a zero-emission closed-loop operation device for atmospheric pressure oil tanks.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A zero-emission closed-loop operation device for atmospheric pressure oil tanks is provided, comprising: a first adsorption cylinder, a second adsorption cylinder, a first programmable valve, a second programmable valve, a third programmable valve, a fourth programmable valve, a fifth programmable valve, a sixth programmable valve, a seventh programmable valve, an eighth programmable valve, a regenerated gas pipeline, a clean gas pipeline, a first atmospheric pressure oil tank, a second atmospheric pressure oil tank, and a control cabinet; One end of the first adsorption cylinder is connected to the pipelines of the first and third programmable valves, and the other end is connected to the pipelines of the fifth and seventh programmable valves, respectively; one end of the second adsorption cylinder is connected to the pipelines of the second and fourth programmable valves, respectively, and the other end is connected to the pipelines of the sixth and eighth programmable valves, respectively; the first and second programmable valves are connected to the clean gas pipeline; the third and fourth programmable valves are connected to the regenerated gas pipeline; the fifth and sixth programmable valves are connected to the vent pipeline of the first atmospheric pressure oil tank; the seventh and eighth programmable valves are connected to the vent pipeline of the second atmospheric pressure oil tank, respectively. The first, second, third, fourth, fifth, sixth, seventh, and eighth programmable valves are respectively connected to the control cabinet circuit.

[0006] Preferably, the control cabinet controls the opening or closing of the first, second, third, fourth, fifth, sixth, seventh, and eighth programmable valves.

[0007] More preferably, when the regenerated gas pipeline, the third programmable valve, and the first adsorption cylinder need to be connected in sequence, and the second adsorption cylinder, the second programmable valve, and the clean gas pipeline need to be connected in sequence, the control cabinet controls the second programmable valve and the third programmable valve to open, and the first programmable valve and the fourth programmable valve to close.

[0008] More preferably, when the regenerated gas pipeline, the fourth programmable valve, and the second adsorption cylinder need to be connected in sequence, and the first adsorption cylinder, the first programmable valve, and the clean gas pipeline are connected in sequence, the control cabinet controls the first programmable valve and the fourth programmable valve to open, and the second programmable valve and the third programmable valve to close.

[0009] More preferably, when the vent hole of the first atmospheric pressure oil tank, the fifth programmable valve, and the first adsorption cylinder need to be connected in sequence by pipelines, and the vent hole of the second atmospheric pressure oil tank, the eighth programmable valve, and the second adsorption cylinder need to be connected in sequence by pipelines, the control cabinet controls the fifth programmable valve and the eighth programmable valve to open, and the sixth programmable valve and the seventh programmable valve to close.

[0010] More preferably, when the vent hole of the first atmospheric pressure oil tank, the sixth programmable valve, and the second adsorption cylinder need to be connected by pipelines in sequence, and the vent hole of the second atmospheric pressure oil tank, the seventh programmable valve, and the first adsorption cylinder are connected by pipelines in sequence, the control cabinet controls the sixth and seventh programmable valves to open, and the fifth and eighth programmable valves to close.

[0011] Preferably, the lower space of the first adsorption cylinder and the second adsorption cylinder is filled with a regenerable adsorption material; the regenerable adsorption material is one or more of activated carbon, resin or fiber.

[0012] Preferably, the regenerated gas is ambient temperature regenerated gas or high temperature regenerated gas.

[0013] More preferably, the regenerated gas is one or more of air, kiln flue gas, or high-temperature steam.

[0014] More preferably, when the regenerated gas is a non-high-temperature regenerated gas, it also includes a heater using an electric heating process; One end of the heater is connected to the regeneration gas pipeline, and the other end is connected to the pipelines of the third programmable valve and the fourth programmable valve, respectively.

[0015] The present invention adopts the above technical solution and has the following technical effects compared with the prior art: The zero-emission closed-loop operation device for atmospheric pressure oil tanks of this invention operates continuously and without interruption, preventing the emission of harmful gases such as volatile organic compounds (VOCs) during maintenance. It is completely sealed, with no external connections, thus preventing leakage of VOCs and other harmful gases. The adsorbent is reusable, producing no solid waste pollutants. The equipment can be directly used on existing oil tanks without additional modifications, connecting directly to the existing vents. During system operation, the pressure inside the oil tank remains at a slightly positive pressure, eliminating the need for external pressurization or nitrogen sealing measures. The oil tank has no external connections, ensuring safe operation. There is no exhaust gas or oil discharge during operation; the entire system is recycled, with oil and gas recovered and reintroduced into the oil tank, resulting in no energy waste. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the zero-emission closed-loop operation device for atmospheric pressure oil tanks according to the present invention; Figure 2 This is a schematic diagram of another preferred embodiment of the zero-emission closed-loop operation device for atmospheric pressure oil tanks of the present invention; Figure 3 This is a schematic diagram of another preferred embodiment of the zero-emission closed-loop operation device for atmospheric pressure oil tanks of the present invention; Figure 4 This is a schematic diagram of another preferred embodiment of the zero-emission closed-loop operation device for atmospheric pressure oil tanks of the present invention; The reference numerals in the figures include: First adsorption cylinder 1; second adsorption cylinder 2; heater 3; first programmable valve 4; second programmable valve 5; third programmable valve 6; fourth programmable valve 7; fifth programmable valve 8; sixth programmable valve 9; seventh programmable valve 10; eighth programmable valve 11. Detailed Implementation

[0017] 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.

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0020] Example like Figure 1 As shown, this embodiment provides a zero-emission closed-loop operation device for atmospheric pressure oil tanks, including: a first adsorption cylinder 1, a second adsorption cylinder 2, a first programmable valve 4, a second programmable valve 5, a third programmable valve 6, a fourth programmable valve 7, a fifth programmable valve 8, a sixth programmable valve 9, a seventh programmable valve 10, an eighth programmable valve 11, a regenerated gas pipeline, a clean gas pipeline, a first atmospheric pressure oil tank, a second atmospheric pressure oil tank, and a control cabinet; One end of the first adsorption cylinder 1 is connected to the pipelines of the first programmable valve 4 and the third programmable valve 6, and the other end is connected to the pipelines of the fifth programmable valve 8 and the seventh programmable valve 10, respectively; one end of the second adsorption cylinder 2 is connected to the pipelines of the second programmable valve 5 and the fourth programmable valve 7, respectively, and the other end is connected to the pipelines of the sixth programmable valve 9 and the eighth programmable valve 11, respectively; the first programmable valve 4 and the second programmable valve 5 are respectively connected to the clean gas pipeline; the third programmable valve 6 and the fourth programmable valve 7 are respectively connected to the regeneration gas pipeline; the fifth programmable valve 8 and the sixth programmable valve 9 are respectively connected to the vent pipeline of the first atmospheric pressure oil tank; the seventh programmable valve 10 and the eighth programmable valve 11 are respectively connected to the vent pipeline of the second atmospheric pressure oil tank; The first programmable valve 4, the second programmable valve 5, the third programmable valve 6, the fourth programmable valve 7, the fifth programmable valve 8, the sixth programmable valve 9, the seventh programmable valve 10, and the eighth programmable valve 11 are respectively connected to the control cabinet circuit, that is, the control cabinet controls the opening or closing of the first programmable valve 4, the second programmable valve 5, the third programmable valve 6, the fourth programmable valve 7, the fifth programmable valve 8, the sixth programmable valve 9, the seventh programmable valve 10, and the eighth programmable valve 11.

[0021] When regeneration of the adsorbent at the bottom of the first adsorption cylinder 1 is required, the control cabinet controls the opening of the third programmable valve 6 and the closing of the fourth programmable valve 7. At this time, the regeneration gas pipeline, the third programmable valve 6, and the first adsorption cylinder 1 are connected in sequence. The regeneration gas enters the first adsorption cylinder 1 through pipelines ABCDEK, releasing volatile organic compounds (VOCs) and other harmful gases from the adsorbent. If the oil level in the first atmospheric pressure oil tank drops at this time, the control cabinet controls the opening of the fifth programmable valve 8 and the closing of the seventh programmable valve 10. At this time, the first adsorption cylinder 1... The adsorption cylinder 1, the fifth programmable valve 8, and the vent of the first atmospheric pressure oil tank are connected in sequence by pipelines. The regenerated waste gas is sent into the first atmospheric pressure oil tank through pipeline UONM to maintain the first atmospheric pressure oil tank at positive pressure. If the oil level in the second atmospheric pressure oil tank drops at this time, the control cabinet controls the seventh programmable valve 10 to open and the fifth programmable valve 8 to close. At this time, the first adsorption cylinder 1, the seventh programmable valve 10, and the vent of the second atmospheric pressure oil tank are connected in sequence by pipelines. The regenerated waste gas is sent into the second atmospheric pressure oil tank through pipeline UTSRQ to maintain the second atmospheric pressure oil tank at positive pressure.

[0022] When regeneration of the adsorbent at the bottom of the second adsorption cylinder 2 is required, the control cabinet controls the fourth programmable valve 7 to open and the third programmable valve 6 to close. At this time, the regeneration gas pipeline, the fourth programmable valve 7, and the second adsorption cylinder 2 are connected in sequence. The regeneration gas enters the first adsorption cylinder 2 through pipelines ABCDEF, releasing volatile organic compounds (VOCs) and other harmful gases from the adsorbent. If the oil level in the first atmospheric pressure oil tank drops at this time, the control cabinet controls the sixth programmable valve 9 to open and the eighth programmable valve 11 to close. At this time, the second adsorption cylinder 2... The second adsorption cylinder 2, the sixth programmable valve 9, and the vent of the first atmospheric pressure oil tank are connected in sequence by pipelines. The regenerated waste gas is sent into the first atmospheric pressure oil tank through pipeline PONM to maintain the first atmospheric pressure oil tank at positive pressure. If the oil level in the second atmospheric pressure oil tank drops at this time, the control cabinet controls the eighth programmable valve 11 to open and the sixth programmable valve 9 to close. At this time, the second adsorption cylinder 2, the eighth programmable valve 11, and the vent of the second atmospheric pressure oil tank are connected in sequence by pipelines. The regenerated waste gas is sent into the second atmospheric pressure oil tank through pipeline PVSRQ to maintain the second atmospheric pressure oil tank at positive pressure.

[0023] When the adsorbent at the bottom of the first adsorption cylinder 1 needs to be adsorbed, the control cabinet controls the first programmable valve 4 to open and the second programmable valve 5 to close. At this time, the first adsorption cylinder 1, the first programmable valve 4, and the clean gas pipeline are connected in sequence, and the clean gas after treatment is discharged into the atmosphere through pipeline KJIHG. If the oil level in the first atmospheric pressure oil tank rises at this time, the control cabinet controls the fifth programmable valve 8 to open and the seventh programmable valve 10 to close. At this time, the vent of the first atmospheric pressure oil tank, the fifth programmable valve 8, and the first adsorption cylinder 1 are connected in sequence, and the waste gas in the upper space of the first atmospheric pressure oil tank is discharged into the atmosphere through pipeline MN. The exhaust gas (OU) enters the first adsorption cylinder 1, where the adsorbent at the bottom of the first adsorption cylinder 1 treats the volatile organic compounds (VOCs) and other harmful gases in the exhaust gas. If the oil level in the second atmospheric pressure oil tank rises at this time, the control cabinet controls the seventh programmable valve 10 to open and the fifth programmable valve 8 to close. At this time, the vent of the second atmospheric pressure oil tank, the seventh programmable valve 10, and the first adsorption cylinder 1 are connected in sequence by pipelines. The exhaust gas in the upper space of the second atmospheric pressure oil tank enters the first adsorption cylinder 1 through the pipeline QRSTU, where the adsorbent at the bottom of the first adsorption cylinder 1 treats the volatile organic compounds (VOCs) and other harmful gases in the exhaust gas.

[0024] When the adsorbent at the bottom of the second adsorption cylinder 2 needs to be adsorbed, the control cabinet controls the second programmable valve 5 to open and the first programmable valve 4 to close. At this time, the second adsorption cylinder 2, the second programmable valve 5, and the clean gas pipeline are connected in sequence, and the clean gas after treatment is discharged into the atmosphere through pipeline FLIHG. If the oil level in the first atmospheric pressure oil tank rises at this time, the control cabinet controls the sixth programmable valve 9 to open and the eighth programmable valve 11 to close. At this time, the vent of the first atmospheric pressure oil tank, the sixth programmable valve 9, and the second adsorption cylinder 2 are connected in sequence, and the waste gas in the upper space of the first atmospheric pressure oil tank is discharged into the atmosphere through pipeline MN. The OP enters the second adsorption cylinder 2, where the adsorbent at the bottom of the second adsorption cylinder 2 treats the volatile organic compounds (VOCs) and other harmful gases in the waste gas. If the oil level in the second atmospheric pressure oil tank rises at this time, the control cabinet controls the opening of the eighth programmable valve 11 and the closing of the sixth programmable valve 9. At this time, the vent of the second atmospheric pressure oil tank, the eighth programmable valve 11, and the second adsorption cylinder 2 are connected in sequence by pipelines. The waste gas in the upper space of the second atmospheric pressure oil tank enters the second adsorption cylinder 2 through the pipeline QRSVP, where the adsorbent at the bottom of the second adsorption cylinder 2 treats the volatile organic compounds (VOCs) and other harmful gases in the waste gas.

[0025] Obviously, when the first adsorption tank 1 is in the adsorption process, the second adsorption tank 2 is in the regeneration process; when the first adsorption tank 1 switches from the adsorption process to the regeneration process, the second adsorption tank 2 switches from the regeneration process to the adsorption process accordingly. Similarly, when the oil level in the first atmospheric pressure tank rises, the oil level in the second atmospheric pressure tank falls; and when the oil level in the first atmospheric pressure tank falls, the oil level in the second atmospheric pressure tank rises.

[0026] like Figure 2 As shown, in another preferred embodiment of the present invention, the number of adsorption cylinders can be increased to 3. The connection between each atmospheric pressure oil tank and each adsorption cylinder is controlled by the control cabinet to maintain the pressure in each atmospheric pressure oil tank and maintain the adsorption / regeneration balance of each adsorption cylinder.

[0027] like Figure 3 As shown, in another preferred embodiment of the present invention, the number of atmospheric pressure oil tanks can be increased to three. The connection between each atmospheric pressure oil tank and each adsorption cylinder is controlled by the control cabinet to maintain the pressure in each atmospheric pressure oil tank and maintain the adsorption / regeneration balance of each adsorption cylinder.

[0028] like Figure 4 As shown, in another preferred embodiment of the present invention, the number of adsorption cylinders and atmospheric pressure oil tanks is increased to three. The connection between each atmospheric pressure oil tank and each adsorption cylinder is controlled by a control cabinet to maintain the pressure in each atmospheric pressure oil tank and maintain the adsorption / regeneration balance of each adsorption cylinder.

[0029] Therefore, the lower space of the first adsorption cylinder 1 and the second adsorption cylinder 2 is filled with regenerable adsorption material; the regenerable adsorption material is one or more of activated carbon, resin or fiber.

[0030] Preferably, the regenerated gas is ambient temperature regenerated gas or high temperature regenerated gas.

[0031] More preferably, the regenerated gas is one or more of air, kiln flue gas, or high-temperature steam.

[0032] More preferably, when the regeneration gas is a non-high-temperature regeneration gas, it further includes a heater 3 using an electric heating process to heat the regeneration gas to a certain regeneration temperature to regenerate the adsorbent; One end of the heater 3 is connected to the regeneration gas pipeline, and the other end is connected to the pipelines of the third programmable valve 6 and the fourth programmable valve 7 respectively.

[0033] In summary, the zero-emission closed-loop operation device for atmospheric pressure oil tanks of the present invention operates continuously and without interruption, preventing the emission of harmful gases such as volatile organic compounds (VOCs) during maintenance; it is completely sealed, with no external connection, preventing leakage of harmful gases such as volatile organic compounds (VOCs); the adsorbent can be reused, producing no solid waste pollutants; and it has vents to maintain the pressure of the oil tank, eliminating the need for external pressurization and ensuring safe operation of the oil tank.

[0034] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for zero-discharge closed-loop operation of an atmospheric pressure oil tank, characterized in that, include: A zero-emission closed-loop operation device for atmospheric pressure oil tanks is provided. The device includes: a first adsorption cylinder (1) with its first end connected to a clean gas pipeline and a regenerated gas pipeline respectively, and its second end connected to the vent hole of a first atmospheric pressure oil tank and the vent hole of a second atmospheric pressure oil tank respectively; and a second adsorption cylinder (2) with its first end connected to a clean gas pipeline and a regenerated gas pipeline respectively, and its second end connected to the vent hole of a first atmospheric pressure oil tank and the vent hole of a second atmospheric pressure oil tank respectively. Control the opening or closing of the programmable valves on the connecting pipeline: when the first adsorption cylinder (1) is in the adsorption process, the second adsorption cylinder (2) is in the regeneration process; when the first adsorption cylinder (1) switches from the adsorption process to the regeneration process, the second adsorption cylinder (2) switches from the regeneration process to the adsorption process accordingly. When the adsorption tank is in the adsorption process, the clean gas after complete treatment is discharged into the atmosphere through the pipeline; the exhaust gas in the upper space of the atmospheric pressure oil tank with the oil level rising enters the adsorption tank in the adsorption process through the pipeline, and the volatile organic compounds (VOCs) harmful gases in the exhaust gas are treated by the adsorbent at the bottom of the adsorption tank. When the adsorption tank is undergoing the regeneration process, the regeneration gas enters the adsorption tank through the pipeline, and the volatile organic compounds (VOCs) are released from the adsorbent at the bottom of the adsorption tank. The regenerated waste gas is then sent through the pipeline to the atmospheric pressure oil tank where the oil level has dropped, maintaining the atmospheric pressure oil tank at a positive pressure.

2. The zero-emission closed-loop operation method for atmospheric pressure oil tanks according to claim 1, characterized in that, The zero-emission closed-loop operation device for atmospheric pressure oil tanks includes: a first adsorption cylinder (1), a second adsorption cylinder (2), a first programmable valve (4), a second programmable valve (5), a third programmable valve (6), a fourth programmable valve (7), a fifth programmable valve (8), a sixth programmable valve (9), a seventh programmable valve (10), an eighth programmable valve (11), a regenerated gas pipeline, a clean gas pipeline, a first atmospheric pressure oil tank, a second atmospheric pressure oil tank, and a control cabinet; The first end of the first adsorption cylinder (1) is connected to the pipelines of the first programmable valve (4) and the third programmable valve (6), and the second end of the first adsorption cylinder (1) is connected to the pipelines of the fifth programmable valve (8) and the seventh programmable valve (10), respectively; the first end of the second adsorption cylinder (2) is connected to the pipelines of the second programmable valve (5) and the fourth programmable valve (7), and the second end of the second adsorption cylinder (2) is connected to the pipelines of the sixth programmable valve (9) and the eighth programmable valve (11), respectively; the first programmable valve (4) and the second programmable valve (5) are connected to the pipelines of the clean gas pipeline, respectively; the third programmable valve (6) and the fourth programmable valve (7) are connected to the pipelines of the regenerated gas pipeline, respectively; the fifth programmable valve (8) and the sixth programmable valve (9) are connected to the vent pipe of the first atmospheric pressure oil tank, respectively; the seventh programmable valve (10) and the eighth programmable valve (11) are connected to the vent pipe of the second atmospheric pressure oil tank, respectively; The first programmable valve (4), the second programmable valve (5), the third programmable valve (6), the fourth programmable valve (7), the fifth programmable valve (8), the sixth programmable valve (9), the seventh programmable valve (10), and the eighth programmable valve (11) are respectively connected to the control cabinet circuit.

3. The zero-emission closed-loop operation method for atmospheric pressure oil tanks according to claim 2, characterized in that, When the first adsorption cylinder (1) is in the adsorption process, the first programmable valve (4) is opened by the control cabinet and the second programmable valve (5) is closed. At this time, the first adsorption cylinder (1), the first programmable valve (4) and the clean gas pipeline are connected in sequence. The clean gas after complete treatment is discharged into the atmosphere through pipeline (K)-pipeline (J)-pipeline (I)-pipeline (H)-pipeline (G). If the oil level in the first atmospheric pressure oil tank rises at this time, the control cabinet will control the fifth programmable valve (8) to open and the seventh programmable valve (10) to close. At this time, the vent of the first atmospheric pressure oil tank, the fifth programmable valve (8) and the first adsorption cylinder (1) are connected in sequence by pipeline. The exhaust gas in the upper space of the first atmospheric pressure oil tank enters the first adsorption cylinder (1) through pipeline (M)-pipeline (N)-pipeline (O)-pipeline (U). The volatile organic compounds (VOCs) in the exhaust gas are treated by the adsorbent at the bottom of the first adsorption cylinder (1). If the oil level in the second atmospheric pressure oil tank rises at this time, the control cabinet will control the seventh programmable valve (10) to open and the fifth programmable valve (8) to close. At this time, the vent of the second atmospheric pressure oil tank, the seventh programmable valve (10) and the first adsorption cylinder (1) are connected in sequence. The exhaust gas in the upper space of the second atmospheric pressure oil tank enters the first adsorption cylinder (1) through the pipeline (Q)-pipeline (R)-pipeline (S)-pipeline (T)-pipeline (U). The volatile organic compounds (VOCs) in the exhaust gas are treated by the adsorbent at the bottom of the first adsorption cylinder (1).

4. The zero-emission closed-loop operation method for atmospheric pressure oil tanks according to claim 2, characterized in that, When the second adsorption cylinder (2) is in the adsorption process, the control cabinet controls the second programmable valve (5) to open and the first programmable valve (4) to close. At this time, the second adsorption cylinder (2), the second programmable valve (5) and the clean gas pipeline are connected in sequence. The clean gas after complete treatment is discharged into the atmosphere through pipeline (F)-pipeline (L)-pipeline (I)-pipeline (H)-pipeline (G). If the oil level in the first atmospheric pressure oil tank rises at this time, the control cabinet will control the sixth programmable valve (9) to open and the eighth programmable valve (11) to close. At this time, the vent of the first atmospheric pressure oil tank, the sixth programmable valve (9) and the second adsorption cylinder (2) are connected in sequence by pipeline. The exhaust gas in the upper space of the first atmospheric pressure oil tank enters the second adsorption cylinder (2) through pipeline (M)-pipeline (N)-pipeline (O)-pipeline (P). The volatile organic compounds (VOCs) in the exhaust gas are treated by the adsorbent at the bottom of the second adsorption cylinder (2). If the oil level in the second atmospheric pressure oil tank rises at this time, the control cabinet will control the eighth programmable valve (11) to open and the sixth programmable valve (9) to close. At this time, the vent of the second atmospheric pressure oil tank, the eighth programmable valve (11) and the second adsorption cylinder (2) are connected in sequence by pipeline. The exhaust gas in the upper space of the second atmospheric pressure oil tank enters the second adsorption cylinder (2) through pipeline (Q)-pipeline (R)-pipeline (S)-pipeline (V)-pipeline (P). The volatile organic compounds (VOCs) in the exhaust gas are treated by the adsorbent at the bottom of the second adsorption cylinder (2).

5. The zero-emission closed-loop operation method for atmospheric pressure oil tanks according to claim 2, characterized in that, When the first adsorption cylinder (1) is in the regeneration process, the control cabinet controls the third programmable valve (6) to open and the fourth programmable valve (7) to close. At this time, the regeneration gas pipeline, the third programmable valve (6) and the first adsorption cylinder (1) are connected in sequence. The regeneration gas enters the first adsorption cylinder (1) through pipeline (A)-pipeline (B)-pipeline (C)-pipeline (D)-pipeline (E)-pipeline (K) to desorb volatile organic compounds (VOCs) from the adsorbent at the bottom of the first adsorption cylinder (1). If the oil level in the first atmospheric pressure oil tank drops at this time, the control cabinet will control the fifth programmable valve (8) to open and the seventh programmable valve (10) to close. At this time, the first adsorption cylinder (1), the fifth programmable valve (8) and the vent of the first atmospheric pressure oil tank are connected in sequence by pipelines. The regenerated waste gas is sent into the first atmospheric pressure oil tank through pipeline (U)-pipeline (O)-pipeline (N)-pipeline (M) to maintain the first atmospheric pressure oil tank at positive pressure. If the oil level in the second atmospheric pressure oil tank drops at this time, the control cabinet will control the seventh programmable valve (10) to open and the fifth programmable valve (8) to close. At this time, the first adsorption cylinder (1), the seventh programmable valve (10), and the vent of the second atmospheric pressure oil tank are connected in sequence. The regenerated waste gas is sent into the second atmospheric pressure oil tank through pipeline (U)-pipeline (T)-pipeline (S)-pipeline (R)-pipeline (Q) to maintain the second atmospheric pressure oil tank at positive pressure.

6. The zero-emission closed-loop operation method for atmospheric pressure oil tanks according to claim 2, characterized in that, When the second adsorption cylinder (2) is in the regeneration process, the control cabinet controls the fourth programmable valve (7) to open and the third programmable valve (6) to close. At this time, the regeneration gas pipeline, the fourth programmable valve (7) and the second adsorption cylinder (2) are connected in sequence. The regeneration gas enters the second adsorption cylinder (2) through pipeline (A)-pipeline (B)-pipeline (C)-pipeline (D)-pipeline (E)-pipeline (F) to desorb volatile organic compounds (VOCs) from the adsorbent at the bottom of the second adsorption cylinder (2). If the oil level in the first atmospheric pressure oil tank drops at this time, the control cabinet will control the sixth programmable valve (9) to open and the eighth programmable valve (11) to close. At this time, the second adsorption cylinder (2), the sixth programmable valve (9) and the vent of the first atmospheric pressure oil tank are connected in sequence by pipelines. The regenerated waste gas is sent into the first atmospheric pressure oil tank through pipeline (P)-pipeline (O)-pipeline (N)-pipeline (M) to maintain the first atmospheric pressure oil tank at positive pressure. If the oil level in the second atmospheric pressure oil tank drops at this time, the control cabinet will control the eighth programmable valve (11) to open and the sixth programmable valve (9) to close. At this time, the second adsorption cylinder (2), the eighth programmable valve (11) and the vent of the second atmospheric pressure oil tank are connected in sequence. The regenerated waste gas is sent into the second atmospheric pressure oil tank through pipeline (P)-pipeline (V)-pipeline (S)-pipeline (R)-pipeline (Q) to maintain the second atmospheric pressure oil tank at positive pressure.

7. The zero-emission closed-loop operation method for atmospheric pressure oil tanks according to claim 1, characterized in that, The bottom adsorbent is one or more of activated carbon, resin, or fiber.

8. The zero-emission closed-loop operation method for atmospheric pressure oil tanks according to claim 2, characterized in that, The regenerated gas is either ambient temperature regenerated gas or high temperature regenerated gas.

9. The zero-discharge closed-loop operation method for atmospheric pressure oil tanks according to claim 8, characterized in that, The regenerated gas is one or more of air, kiln flue gas, or high-temperature steam.

10. The zero-emission closed-loop operation method for atmospheric pressure oil tanks according to claim 8, characterized in that, When the regeneration gas is a non-high temperature regeneration gas, it also includes a heater (3) using an electric heating process to heat the regeneration gas to a certain regeneration temperature and then regenerate the adsorbent; The first end of the heater (3) is connected to the regenerated gas pipeline, and the second end of the heater (3) is connected to the pipelines of the third programmable valve (6) and the fourth programmable valve (7).

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