Oil gas recovery system and control method thereof

Abstract

The invention discloses an oil gas recovery system which comprises an inlet hose, a first recovery main pipe, a second recovery main pipe, a first valve, a second valve, an induced draft fan, condensation recovery equipment, a first discharge port and a second discharge port, the inlet hose is connected with the first recovery main pipe through the first valve, and the inlet hose is further connected with the second recovery main pipe through the second valve; wherein a one-way valve is arranged at the front end of the position, connected with the first valve, of the first recovery main pipe, a circulating pipeline is arranged between the input end of the induced draft fan and the output end of the condensation recovery equipment, a circulating valve is arranged on the circulating pipeline, and a vent valve is connected between the output end of the condensation recovery equipment and the first discharge outlet in a bypass mode. According to the oil and gas recovery system, stable operation of the system can be kept under the condition of discontinuous loading and delivery, system alarm caused by oil and gas overflow in the system after loading is stopped is avoided, and frosting of condensation recovery equipment is avoided, and the invention further provides a control method of the oil and gas recovery system.

Description

Technical Field

[0001] The invention belongs to the field of petrochemical industry, and in particular relates to an oil and gas recovery system and a control method thereof. Background Art

[0002] According to relevant national regulations, petrochemical storage companies need to collect and treat the oil and gas generated during the loading process of certain types of oil, such as crude oil, gasoline, aviation kerosene, naphtha, etc. These specific types of oil will produce volatile organic compounds during the loading process, which must be collected and treated according to regulations, and the emission concentration after treatment shall not exceed 25g / m 3 And the processing efficiency shall not be less than 95%. In order to collect the oil and gas generated during the loading process, the loading area is usually equipped with an oil and gas recovery main pipe. The main pipe is equipped with a collection port at each loading position and is connected to the processing device. Condensation or other processes are mainly used for recovery and treatment. The current recovery system often has unstable system operation in the face of discontinuous loading and unloading. For example, after the loading is stopped, the oil and gas overflow in the system causes the system to alarm, the condensation recovery equipment is frosted, affecting the heat exchange efficiency, and the oil and gas concentration detector at the discharge port alarms after the system is shut down. It takes a while for the condensation system to establish a cold field. The system takes 60-90 minutes from startup to the low temperature required to ensure qualified emissions. In order to ensure that emissions meet standards, the condensation system usually needs to be started in advance, and it also needs to be kept running when there is no loading to ensure that loading operations can be carried out immediately after the tank truck arrives. The energy consumption is very high. Therefore, in order to avoid the shortcomings of the prior art, it is necessary to improve the prior art. Summary of the invention

[0003] The purpose of the present invention is to provide an oil and gas recovery system that can maintain stable operation of the system when facing discontinuous loading and unloading, avoid oil and gas overflow in the system after loading is stopped, causing system alarm, and avoid frosting of condensation recovery equipment. The present invention also provides a control method for the oil and gas recovery system.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0005] An oil and gas recovery system includes an inlet hose, a first recovery main pipe, a second recovery main pipe, a first valve, a second valve, a blower, a condensation recovery device, a first discharge port, and a second discharge port. The inlet hose is used to connect to the oil and gas discharge system of an oil loading truck. The first recovery main pipe is used to collect oil and gas of specific varieties. The second recovery main pipe is used to collect oil and gas of non-specific varieties. The inlet hose is connected to the first recovery main pipe through the first valve. The inlet hose is also connected to the second recovery main pipe through the second valve. The second recovery main pipe is connected to the second discharge port. The first recovery main pipe is connected to the input end of the blower. The output end of the blower is connected to the input end of the condensation recovery device. The output end of the condensation recovery device is connected to the first discharge port. Among them, a check valve is provided at the front end of the first recovery main pipe where it is connected to the first valve. The check valve is communicated with the external environment and can allow external air to enter the first recovery main pipe. A circulation pipeline is provided between the input end of the blower and the output end of the condensation recovery device. A circulation valve is provided on the circulation pipeline. A ventilation valve is bypass-connected between the output end of the condensation recovery device and the first discharge port. The ventilation valve is communicated with the external environment.

[0006] As a preferred solution of the above oil and gas recovery system, an other recovery module is provided between the output end of the condensation recovery device and the ventilation valve.

[0007] As a preferred solution of the above oil and gas recovery system, a third valve is provided between the output end of the condensation recovery device and the other recovery module.

[0008] As a preferred solution of the above oil and gas recovery system, the condensation recovery device is provided with a plurality of condensation branches. A plurality of heat exchangers are provided on each condensation branch. The condensation branch includes an output end and a recovery end. The output end of the condensation branch is connected to the output end of the condensation recovery device. The recovery end of the condensation branch is connected to the device for storing oil.

[0009] As a preferred solution of the above oil and gas recovery system, the oil and gas recovery system further includes a flame arrester, which is respectively provided at the rear end of the first valve, the rear end of the second valve, and the front end of the blower.

[0010] As a preferred solution of the above oil and gas recovery system, an oil and gas concentration detection meter is provided at the first discharge port.

[0011] The present invention also provides a control method for an oil and gas recovery system, which connects the above oil and gas recovery system to the business management system of an oil storage enterprise, and adjusts the operation mode according to the reservation information of the business management system of the oil storage enterprise:

[0012] When it is required to load the vehicle within 90 minutes, the pre-cooling mode is started, the induced draft fan and the condensation recovery device are started, the circulation valve is opened, and the ventilation valve is opened;

[0013] When loading the vehicle, the loading mode is started, the induced draft fan and the condensation recovery device remain started, the circulation valve is closed, and the ventilation valve is closed;

[0014] When the vehicle loading is completed but there is a vehicle loading reservation within the next 90 minutes, the circulation standby mode is started, the induced draft fan and the condensation recovery device remain started, the circulation valve is opened, and the ventilation valve is opened;

[0015] When the vehicle loading is completed and there is no vehicle loading reservation within the next 90 minutes, the shutdown mode is started, the induced draft fan and the condensation recovery device continue to run for 3 minutes and then are closed, and the ventilation valve remains open.

[0016] As a preferred solution of the control method of the above oil and gas recovery system, when starting the loading mode, according to the reservation information of the business management system of the oil storage enterprise, when loading a specific variety of oil, the first valve is opened;

[0017] When loading a non-specific variety of oil, the second valve is opened.

[0018] Implementing an oil and gas recovery system provided by the present invention, compared with the prior art, its beneficial effects are as follows:

[0019] The inlet hose of the present invention can be connected to the oil loading truck's oil and gas emission system to process the oil and gas generated during the loading process of the oil loading truck. Through the design of the dual recovery main pipes, the oil and gas generated by specific varieties of oil and the oil and gas generated by non-specific varieties of oil are processed separately. The second recovery main pipe is used to collect non-specific variety of oil and gas and discharge it through the second discharge port. The first recovery main pipe is used to collect specific variety of oil and gas for recovery treatment. The induced draft fan is used to extract air to drive the specific variety of oil and gas in the first recovery main pipe into the condensation recovery device. The condensation recovery device condenses the oil and gas through the condensation process to make the oil and gas condense and liquefy for recovery. The oil and gas with qualified volatile organic compound concentration after condensation treatment is discharged through the first discharge port. After stopping the supply of oil and gas, before waiting for the next oil loading truck to load, the induced draft fan and the condensation recovery device continue to operate for a period of time. The induced draft fan continues to operate to create a negative pressure in the first recovery main pipe, and a pressure difference is formed between the first recovery main pipe and the external environment so that the air in the external environment can enter the first recovery main pipe through the one-way valve. The condensation recovery device continues to operate to condense the last remaining high-concentration oil and gas in the pipe, so as to replace the high-concentration oil and gas in the first recovery main pipe with external air, thereby preventing the oil and gas concentration in the system from being too high after stopping loading. However, the external air contains moisture, and if it continues to be introduced into the condensation recovery device, it will cause frosting of the heat exchanger. By setting up a circulation pipeline and a circulation valve on the circulation pipeline, when not loading, the circulation valve is opened to make the dry air in the pipeline continuously circulate along the lines of the circulation pipeline, the induced draft fan and the condensation recovery device, maintaining the pressure balance in the pipe and avoiding the continuous introduction of external moist air into the first recovery main pipe through the one-way valve, thereby avoiding frosting of the condensation recovery device. The ventilation valve is opened after stopping loading. By setting the ventilation valve, it is avoided that after the induced draft fan and the condensation recovery system stop running, there is no medium flow in the first recovery main pipe, resulting in the overflow of residual oil and gas and triggering a system alarm; in the case of discontinuous loading and unloading of the vehicle, it is avoided that the oil and gas in the system overflows after stopping loading, resulting in a system alarm, avoiding frosting of the condensation recovery device, and improving the operation stability of the system. Brief Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly introduced below.

[0021] Figure 1 It is a schematic diagram of the oil and gas recovery system of the present invention;

[0022] Figure 2 It is the connection between the oil and gas recovery system of the present invention and the business management system of the oil storage enterprise.

[0023] Markings in the figure:

[0024] 1. First recovery main pipe; 2. Second recovery main pipe; 3. Check valve; 4. First valve; 5. Second valve; 6. Flame arrester; 7. Induced draft fan; 8. Condensation recovery equipment; 9. Circulation pipeline; 10. Other recovery modules; 11. Vent valve; 12. First discharge port; 13. Oil and gas concentration detector; 14. Second discharge port; 15. Circulation valve; 16. Condensation branch; 17. Heat exchanger; 18. Third valve; 19. Inlet hose. Detailed implementation manners

[0025] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0026] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0027] In the description of the present invention, the meaning of several is one or more, the meaning of multiple is two or more, and understandings such as greater than, less than, exceeding, etc. do not include the present number, and understandings such as above, below, within, etc. include the present number. If there is a description of first and second, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0028] In the description of the present invention, unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0029] Please refer to Figures 1 to 2 together, and now the oil and gas recovery system provided by the embodiments of the present invention will be described.

[0030] As Figures 1 to 2As shown in the figure, the oil and gas recovery system of the present invention includes an inlet hose 19, a first recovery main pipe 1, a second recovery main pipe 2, a first valve 4, a second valve 5, a blower 7, a condensation recovery device 8, a first discharge port 12, and a second discharge port 14. The inlet hose 19 is used to connect to the oil and gas discharge system of an oil loading truck. The first recovery main pipe 1 is used to collect oil and gas of specific varieties. The second recovery main pipe 2 is used to collect oil and gas of non-specific varieties. The inlet hose 19 is connected to the first recovery main pipe 1 through the first valve 4. The inlet hose 19 is also connected to the second recovery main pipe 2 through the second valve 5. The second recovery main pipe 2 is connected to the second discharge port 14. The first recovery main pipe 1 is connected to the input end of the blower 7. The output end of the blower 7 is connected to the input end of the condensation recovery device 8. The output end of the condensation recovery device 8 is connected to the first discharge port 12. Among them, a check valve 3 is provided at the front end of the first recovery main pipe 1 at the connection with the first valve 4. The check valve 3 is communicated with the external environment and can allow external air to enter the first recovery main pipe 1. A circulation pipeline 9 is provided between the input end of the blower 7 and the output end of the condensation recovery device 8. A circulation valve 15 is provided on the circulation pipeline 9. A vent valve 11 is bypass-connected between the output end of the condensation recovery device 8 and the first discharge port 12. The vent valve 11 is communicated with the external environment.

[0031] Specifically, the blower 7 is an explosion-proof blower 7. The valve core of the check valve 3 is made of non-ferrous metal. There is high-concentration oil and gas in the oil and gas recovery system. Using an explosion-proof blower 7 ensures safety. Using non-ferrous metal for the valve core of the check valve avoids generating sparks during collision and ensures the stable and safe operation of the oil and gas recovery system.

[0032] Exemplarily, an additional recovery module 10 is provided between the output end of the condensation recovery device 8 and the vent valve 11. The additional recovery module 10 processes other gases except high-concentration oil and gas to ensure that the gas discharged from the first discharge port 12 is qualified.

[0033] Exemplarily, a third valve 18 is provided between the output end of the condensation recovery device 8 and the additional recovery module 10. The third valve 18 is kept open to allow the processed gas to be discharged from the first discharge port 12 after passing through the additional recovery module 10. When the circulation valve 15 is opened, standby circulation is performed to allow the gas in the first recovery main pipe 1 to continuously circulate along the lines of the circulation pipeline 9, the blower 7, and the condensation recovery device 8.

[0034] Exemplarily, the condensation recovery device 8 is provided with a plurality of condensation branches 16. A plurality of heat exchangers 17 are arranged on each condensation branch 16. The condensation branch 16 includes an output end and a recovery end. The output end of the condensation branch 16 is connected to the output end of the condensation recovery device 8, and the recovery end of the condensation branch 16 is connected to the device for storing oil. Through multi-stage condensation by a plurality of condensation branches 16, the condensation treatment efficiency is improved, the recovery rate is increased. Through multi-stage condensation, the boiling point differences of different components are fully utilized, the cascade utilization of energy is realized, the energy consumption is reduced, high-efficiency condensation recovery is achieved, and the emission of harmful gases is reduced.

[0035] Exemplarily, the oil and gas recovery system further includes a flame arrester 6, which is respectively arranged at the rear end of the first valve 4, the rear end of the second valve 5 and the front end of the induced draft fan 7. The flame arrester 6 is arranged in multiple places, significantly reducing the explosion risk.

[0036] Exemplarily, an oil and gas concentration detection meter 13 is arranged at the first discharge port 12 to detect whether the oil and gas concentration discharged from the first discharge port 12 is qualified, so as to monitor whether the oil and gas recovery system is operating normally.

[0037] The present invention also provides a control method for an oil and gas recovery system, which connects the above oil and gas recovery system with the business management system of an oil storage enterprise, and adjusts the operation mode according to the reservation information of the business management system of the oil storage enterprise:

[0038] When it is received that loading is required within 90 minutes, the pre-cooling mode is started. The induced draft fan 7 and the condensation recovery device 8 are started, the circulation valve 15 is opened, and the ventilation valve 11 is opened. It takes a certain period of time for the condensation system to establish a cold field. The condensation recovery device 8 needs to be started 90 minutes in advance according to the reservation information from the start of the system to ensure the qualified low temperature of the discharge. In order to avoid the continuous low pressure of the first recovery main pipe 1 caused by the induced draft fan 7 resulting in the continuous introduction of external moisture-containing air into the first recovery main pipe 1 through the one-way valve 3, the circulation valve 15 is opened to allow the dry air in the pipe to continuously circulate along the lines of the circulation pipeline 9, the induced draft fan 7 and the condensation recovery device 8 to maintain the pressure balance in the pipe. The ventilation valve 11 is opened to balance the pressure in the pipe at the end of the first recovery main pipe 1 close to the first discharge port 12 with the external environmental pressure;

[0039] When loading the vehicle, the loading mode is started. The induced draft fan 7 and the condensation recovery device 8 remain in the starting state. The circulation valve 15 is closed, and the ventilation valve 11 is closed. When loading the vehicle, the condensation recovery device 8 condenses and recovers the oil and gas. The processed gas needs to be discharged out of the system. Therefore, the circulation valve 15 is closed to prevent the processed gas from re-entering the condensation recovery device 8 through the circulation pipeline 9, which affects the condensation recovery efficiency. The ventilation valve 11 is closed to prevent the processed gas from being directly discharged from the ventilation valve 11, resulting in the inability to be discharged through the first discharge port 12 and detecting whether the concentration is qualified.

[0040] When the vehicle loading is completed but there is a vehicle loading reservation within the next 90 minutes, the circulation standby mode is started. The induced draft fan 7 and the condensation recovery device 8 remain in the starting state. The circulation valve 15 is opened, and the ventilation valve 11 is opened. Since it takes some time for the condensation recovery device 8 to establish a cold field, when receiving a vehicle loading reservation within the next 90 minutes, the induced draft fan 7 and the condensation recovery device 8 still remain in operation. After the vehicle loading is completed, the induced draft fan 7 operates to make the first recovery main pipe 1 form a negative pressure, thereby driving external air to enter the first recovery main pipe 1 through the one-way valve 3. After the condensation recovery device 8 condenses and recovers the remaining high-concentration oil and gas in the pipe, the circulation valve 15 is opened, and the introduced air runs along the circulation pipeline 9 in the oil and gas recovery system to maintain the pressure in the pipe and prevent the continuous introduction of moisture-containing air through the one-way valve 3 from causing frosting in the condensation recovery system.

[0041] When the vehicle loading is completed and there is no vehicle loading reservation within the next 90 minutes, the shutdown mode is started. The induced draft fan 7 and the condensation recovery device 8 continue to operate for 3 minutes and then are closed. The ventilation valve 11 remains open. After the induced draft fan 7 and the condensation recovery device 8 continue to operate for 3 minutes, the remaining high-concentration oil and gas in the pipe are condensed and recovered, and then the machine stops. At this time, there is still a small amount of oil and gas remaining in the oil and gas recovery system. Since there is no medium flow in the pipe, the remaining oil and gas may overflow from the first discharge port 12, resulting in system alarm. Therefore, the ventilation valve 11 is opened to maintain the internal and external pressure difference balance and prevent the high concentration of residual oil and gas near the first discharge port 12 from causing system alarm.

[0042] By connecting the oil and gas recovery system with the business management system of the oil storage enterprise, adjusting the operation mode according to the reservation information of the business management system of the oil storage enterprise, predicting the operation demand, and reducing energy consumption waste.

[0043] It should be noted that the equipment is pre-cooled 90 minutes in advance. 90 minutes is not a fixed value. The main purpose is to reduce the condensation outlet air temperature to below -50°C. After the condensation recovery device 8 continues to operate for 3 minutes and then is closed, 3 minutes is not a fixed value either, but approximately 1.2 times the time required to completely replace the oil and gas in the oil and gas main pipe.

[0044] Exemplarily, when starting the loading mode, according to the reservation information of the business management system of the oil storage enterprise, when loading a specific variety of oil, the first valve 4 is opened;

[0045] When loading a non-specific variety of oil, the second valve 5 is opened. The specific variety of oil and gas and the non-specific variety of oil and gas are classified and recovered through the first valve 4 and the second valve 5, realizing the condensation recovery of high-value oil and gas. The non-specific variety of oil and gas can be discharged, reducing the treatment cost.

[0046] Implementing the oil and gas recovery system provided by the present invention, compared with the prior art, its beneficial effects are as follows:

[0047] The inlet hose 19 of the present invention can be connected to the oil and gas emission system of the loading truck to process the oil and gas generated during the loading process of the loading truck. Through the design of the double recovery main pipe, the oil and gas generated by specific varieties of oil and the oil and gas generated by non-specific varieties of oil are respectively processed. The second recovery main pipe 2 is used to collect non-specific varieties of oil and gas and is discharged through the second discharge port 14. The first recovery main pipe 1 is used to collect specific varieties of oil and gas for recovery processing. The induced draft fan 7 sucks air to drive the specific variety of oil and gas in the first recovery main pipe 1 into the condensation recovery device 8. The condensation recovery device 8 condenses the oil and gas through the condensation process to make the oil and gas condense and liquefy for recovery. The oil and gas with qualified volatile organic compound concentration after condensation treatment is discharged through the first discharge port 12. After stopping the supply of oil and gas, before waiting for the next loading truck to load, the induced draft fan 7 and the condensation recovery device 8 continue to operate for a period of time. The induced draft fan 7 continues to operate to form a negative pressure in the first recovery main pipe 1, and a pressure difference is formed between the first recovery main pipe 1 and the external environment so that the air in the external environment can enter the first recovery main pipe 1 through the one-way valve 3. The condensation recovery device 8 continues to operate to condense the last remaining high-concentration oil and gas in the pipe, so as to replace the high-concentration oil and gas in the first recovery main pipe 1 with external air, thereby preventing the oil and gas concentration in the system from being too high after stopping loading. However, the external air contains moisture. If it continues to be introduced into the condensation recovery device 8, the heat exchanger 17 will frost. By setting the circulation pipeline 9 and the circulation valve 15 on the circulation pipeline 9, when not loading, the circulation valve 15 is opened to make the dry air in the pipeline continuously circulate along the lines of the circulation pipeline 9, the induced draft fan 7 and the condensation recovery device 8, maintaining the pressure balance in the pipe and avoiding the continuous introduction of external moist air into the first recovery main pipe 1 through the one-way valve 3, thereby avoiding frosting of the condensation recovery device 8. The ventilation valve 11 is opened after stopping loading. By setting the ventilation valve 11, after the induced draft fan 7 and the condensation recovery system stop running, it is avoided that there is no medium flow in the first recovery main pipe 1, resulting in the overflow of residual oil and gas and triggering a system alarm; in the case of discontinuous loading and leaving the warehouse, it is avoided that the oil and gas in the system overflows after stopping loading, resulting in a system alarm, avoiding frosting of the condensation recovery device 8, and improving the operation stability of the system.

[0048] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. An oil and gas recovery system, characterized in that: It includes an inlet hose, a first recovery mother pipe, a second recovery mother pipe, a first valve, a second valve, an induced draft fan, a condensation recovery device, a first discharge port and a second discharge port. The inlet hose is used to connect the oil and gas discharge system of the oil tanker. The first recovery mother pipe is used to collect specific types of oil and gas, and the second recovery mother pipe is used to collect non-specific types of oil and gas. The inlet hose is connected to the first recovery main pipe through the first valve, the inlet hose is also connected to the second recovery main pipe through the second valve, the second recovery main pipe is connected to the second discharge port, the first recovery main pipe is connected to the input end of the induced draft fan, the output end of the induced draft fan is connected to the input end of the condensation recovery device, and the output end of the condensation recovery device is connected to the first discharge port; Wherein, a one-way valve is provided at the front end of the first recovery main pipe where it is connected to the first valve, and the one-way valve is connected to the external environment and allows external air to enter the first recovery main pipe; A circulation pipeline is provided between the input end of the induced draft fan and the output end of the condensation recovery device, and a circulation valve is provided on the circulation pipeline; A vent valve is bypass-connected between the output end of the condensation recovery device and the first discharge port, and the vent valve is in communication with the external environment.

2. The oil and gas recovery system according to claim 1, characterized in that: Other recovery modules are arranged between the output end of the condensation recovery device and the ventilation valve.

3. The oil and gas recovery system according to claim 2, characterized in that: A third valve is provided between the output end of the condensation recovery device and the other recovery modules.

4. The oil and gas recovery system according to claim 1, characterized in that: The condensation recovery equipment is provided with a plurality of condensation branches, each of which is provided with a plurality of heat exchangers. The condensation branch includes an output end and a recovery end. The output end of the condensation branch is connected to the output end of the condensation recovery equipment, and the recovery end of the condensation branch is connected to the oil storage equipment.

5. The oil vapor recovery system according to claim 1, characterized in that: The oil and gas recovery system further includes a flame arrester, which is respectively arranged at the rear end of the first valve, the rear end of the second valve and the front end of the induced draft fan.

6. The oil vapor recovery system according to claim 1, characterized in that: An oil and gas concentration detection meter is arranged at the first discharge port.

7. A control method for an oil and gas recovery system, characterized in that: The oil and gas recovery system according to any one of claims 1 to 6 is connected to the business management system of the oil storage enterprise, and the operation mode is adjusted according to the reservation information of the business management system of the oil storage enterprise: When receiving a request for loading within 90 minutes, the pre-cooling mode is started, the induced draft fan and the condensate recovery device are started, the circulation valve is opened, and the ventilation valve is opened; When loading is being carried out, the loading mode is started, the induced draft fan and the condensate recovery device are kept started, the circulation valve is closed, and the ventilation valve is closed; When loading is completed but there is a loading appointment within the next 90 minutes, the circulation standby mode is started, the induced draft fan and the condensate recovery device remain in the started state, the circulation valve is opened, and the ventilation valve is opened; When loading is completed and there is no loading appointment within the next 90 minutes, the shutdown mode is activated, the induced draft fan and the condensate recovery equipment continue to run for 3 minutes and then shut down, and the vent valve remains open.

8. The control method of the oil and gas recovery system according to claim 7, characterized in that: When the loading mode is started, according to the reservation information of the business management system of the oil storage enterprise, when the specific type of oil is loaded, the first valve is opened; When non-specific oil is loaded, the second valve is opened.

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