A centralized oil and gas recovery online monitoring system for gas stations and an oil inlet detection method

Abstract

The application provides a centralized oil and gas recovery online monitoring system and oil inlet detection method for a gas station, comprising a plurality of oil dispensers, a plurality of oil pumps, oil supply pipelines, a plurality of oil and gas recovery branch pipelines and an oil and gas recovery main pipeline, a plurality of oil tanks, gas flow meters and a gas station background computer system. The gas station background computer system collects oiling data of each oil dispenser. A gas flow meter is installed on each oil and gas recovery branch pipeline to collect oil and gas recovery data of each oil dispenser. The gas station background computer system calculates the single gun gas-liquid ratio of each transaction record of each oil and gas recovery oil gun. An oil inlet detection device is installed in the oil and gas recovery branch pipeline. When oil inlet phenomenon is found in the oil and gas recovery equipment when the oil and gas recovery type oil gun is working, the oil inlet detection device sends an alarm signal to the gas station background computer system to remind the background to repair in time. The function is to ensure fair trade and improve the reputation of the gas station.

Description

Technical Field

[0001] This invention relates to a centralized online monitoring system for oil and gas recovery at gas stations and a method for detecting incoming oil. Background Technology

[0002] Fuel dispensers are the terminal equipment at gas stations for selling refined oil products, providing a user-friendly interface and accurate metering. "Fuel entering the vapor recovery system" refers to the phenomenon where, during operation, the fuel dispenser displays the number of liters dispensed and the amount of fuel charged even though the main valve of the nozzle hasn't opened and no fuel is flowing out, after the submersible pump has started and the solenoid valve has opened. Alternatively, it could be due to insufficient sealing caused by movement in the fuel line during refueling, allowing fuel to enter the vapor recovery system and resulting in insufficient fuel dispensed. "Fuel entering the vapor recovery system" is a common malfunction at gas stations, influenced by factors such as the working environment, usage patterns and frequency, and maintenance. With age, the fuel dispenser's overall performance gradually deteriorates. After a period of inactivity, issues such as a broken air pipe in the vapor recovery system's central shaft or a broken O-ring seal between the nozzle and the vapor recovery pipe can occur, preventing fuel separation and allowing fuel to enter the vapor recovery system through the air connection.

[0003] Currently, the common problem of "oil entering the vapor recovery equipment" in fuel dispensers is mainly detected through human intervention, such as customer supervision and routine equipment inspections by gas station staff. However, this human intervention method cannot detect the problem in a timely manner. Oil entering the vapor recovery equipment frequently leads to disputes between customers and gas stations regarding the amount of fuel dispensed, causing significant distrust from customers, easily resulting in customer complaints and attracting widespread attention from the public and media. This directly impacts the normal operation of gas stations and damages their brand image.

[0004] Currently, centralized online monitoring systems for vapor recovery at gas stations can monitor in real time whether the vapor-liquid ratio generated by each transaction at every gasoline pump meets the requirements of regulatory authorities, thus improving the image of gas stations. See patent number 202210354764.5, entitled "A Method for Centralized Online Monitoring of Vapor Recovery at Gas Stations," which details this technical solution. However, the functionality of centralized online monitoring systems for vapor recovery at gas stations is still incomplete; there is no effective means to detect "oil entering the vapor recovery equipment," and further improvements are needed. Summary of the Invention

[0005] The purpose of this invention is to provide a centralized online monitoring system for oil and gas recovery at gas stations and a method for detecting oil ingress, thereby solving the technical problem that existing centralized online monitoring systems for oil and gas recovery at gas stations are not yet fully functional and lack an effective means of detecting the phenomenon of "oil ingress into oil and gas recovery equipment".

[0006] The technical solution of this invention is implemented as follows: A centralized online monitoring system for oil and gas recovery at gas stations includes several fuel dispensers, several fuel pumps, fuel supply pipelines, several oil and gas recovery branch pipelines and a main oil and gas return pipeline, several fuel tanks, gas flow meters, and a gas station back-end computer system. Each fuel dispenser is equipped with several oil and gas recovery nozzles, and each nozzle connects to the main oil and gas recovery pipeline via several branch pipelines. The fuel tanks are connected to the fuel dispensers via fuel pumps and fuel lines. Each fuel dispenser is connected to the gas station back-end computer system via a communication line, allowing the system to collect refueling data from each dispenser. A gas flow meter is installed on each oil and gas recovery branch pipeline. A gas flow meter is used to collect vapor recovery data from each fuel dispenser, or a gas flow meter can be installed on the vapor recovery main pipe to monitor the vapor recovery data of the entire gas station in real time. The gas station's back-end computer system then calculates the gas-liquid ratio of each transaction record for each vapor recovery fuel dispenser to determine whether each monitored fuel dispenser meets the regulatory requirements of the government. The feature is that an oil inlet detection device is installed on the vapor recovery branch pipe of each vapor recovery fuel dispenser or fuel dispenser. When oil inlet is detected in the vapor recovery equipment while the vapor recovery fuel dispenser is working, the oil inlet detection device sends an alarm signal to the gas station's back-end computer system to remind the system to perform timely maintenance.

[0007] When the vapor recovery fuel nozzle is found to be inlet, the fuel inlet detection device sends an alarm signal to the gas station's back-end computer system. Upon receiving the fuel inlet information, the gas station's back-end computer system records the start and end times of the fuel inlet information and the device number. Based on the time attribute and device number of the alarm information, the gas station's back-end computer system matches the start and end times and nozzle number of the corresponding fuel nozzle during vapor recovery to determine the fuel inlet status of a specific fuel nozzle and triggers an alarm.

[0008] The aforementioned oil inlet detection device includes a valve body, an oil-gas separator, and a liquid level detection device. An oil collection and metering chamber is located in the middle of the valve body, and the oil-gas separator is located above the oil collection and metering chamber. An air inlet and an exhaust outlet are located on the valve body. The liquid level detection device is installed inside the oil collection and metering chamber, and an oil discharge outlet is located at the bottom of the chamber, connected to the exhaust outlet. The oil and gas recovered by the fuel dispenser's oil and gas recovery equipment enters the valve body through the air inlet. The recovered oil and gas undergo gas-liquid separation by the oil-gas separator located above the oil collection and metering chamber. The separated gas is discharged from the exhaust outlet, and the separated oil enters the oil collection and metering chamber, then flows from the oil discharge outlet at the bottom of the chamber to the exhaust outlet. The liquid level detection device detects the oil level inside the oil collection and metering chamber. When the oil level exceeds a set height, an alarm signal is issued.

[0009] The oil-gas separation device mentioned above is a filter screen.

[0010] The aforementioned liquid level detection device is a float-type liquid level detection device, an ultrasonic liquid level detection device, or a laser liquid level detection device.

[0011] The aforementioned liquid level detection device includes a float, a float rod, and a liquid level sensor. The float is fitted onto the float rod and placed inside the oil collection and metering chamber. The liquid level sensor is a switching assembly installed on the float rod. When the oil level in the oil collection and metering chamber exceeds the set height, the float moves upward along the float rod to touch the liquid level sensor, causing the liquid level sensor to issue an alarm signal.

[0012] The valve body described above includes a main body and a cover. The cover is installed at the top of the main body. The oil metering chamber is located in the middle of the main body. An air inlet channel is provided on the right side of the oil metering chamber, and an exhaust channel is provided on the left side of the oil metering chamber. The air inlet is connected to the bottom end of the air inlet channel, and the top end of the air inlet channel is connected to the filter screen. The oil-gas separation device uses the exhaust channel to discharge the separated gas. The exhaust channel is connected to the exhaust port. The top of the float rod is installed on the cover.

[0013] Both the exhaust port and the air inlet are threaded for easy pipe connection.

[0014] The main body is a flat block shape, with the air inlet located on the right side of the main body and the exhaust outlet located on the bottom surface of the main body.

[0015] A method for detecting oil inlet in a centralized online monitoring system for oil and gas recovery at gas stations is disclosed. The centralized online monitoring system for oil and gas recovery at gas stations is as described above. The method is characterized by the following: During the oil and gas recovery process at refueling, a malfunction in the oil and gas recovery equipment causes oil to enter the equipment. The oil and oil and gas enter the valve body and are separated by an oil and gas separator. The oil flows into the oil collection and metering chamber, while the oil and gas flow into the oil and gas recovery pipeline through the exhaust port. When the inflow velocity of the oil into the oil collection and metering chamber is lower than the velocity directly discharged through the exhaust port, the oil does not accumulate in the chamber, the liquid level does not rise, and the liquid level detection device is not triggered. When the inflow velocity of the oil is greater than the discharge velocity through the exhaust port, excess oil accumulates in the oil collection and metering chamber to a certain amount, the liquid level rises, and the liquid level detection device issues an alarm signal.

[0016] Advantages of this invention compared to existing technologies: This invention can promptly detect oil ingress into the vapor recovery equipment, facilitating timely equipment maintenance. In this invention's centralized online monitoring system for vapor recovery at gas stations, the vapor recovered from the fuel dispenser's vapor recovery equipment enters the valve body through the exhaust port. The recovered vapor undergoes gas-liquid separation via an oil-gas separator located above the oil collection and metering chamber. The separated gas exits through the exhaust port, while the separated oil enters the oil collection and metering chamber and flows from the drain outlet at the bottom of the chamber back to the exhaust port. A level detection device monitors the oil level inside the oil collection and metering chamber. When the oil level exceeds a set height, an alarm signal is issued. This system can promptly detect oil ingress into the fuel dispenser's vapor recovery equipment, preventing disputes between customers and gas stations regarding fuel quantity, increasing customer trust, reducing customer complaints, avoiding widespread public and media attention, ensuring the normal operation of the gas station, and enhancing its brand image. Attached image description:

[0017] Figure 1 This is a front view of a fuel dispenser in a gas station according to existing technology. Figure 2 This is a block diagram illustrating the principle of Embodiment 1 of the present invention; Figure 3 This is a perspective view of the oil inlet detection device according to Embodiment 1 of the present invention; Figure 4 This is another perspective view of the oil detection device according to Embodiment 1 of the present invention; Figure 5 This is a front view of the oil inlet detection device according to Embodiment 1 of the present invention; Figure 6 yes Figure 5 AA section view; Figure 7 This is an exploded view of the oil inlet detection device according to Embodiment 1 of the present invention. Detailed implementation method:

[0018] Example 1: like Figure 1 As shown, existing gas stations typically have 4 to 16 fuel dispensers, and each dispenser generally has 6 vapor recovery nozzles. The 6 vapor recovery nozzles are evenly distributed on both sides of the dispenser, with 3 vapor recovery nozzles on each side corresponding to 92# gasoline, 95# gasoline, and 98# gasoline, respectively.

[0019] like Figure 2As shown, a centralized online monitoring system for oil and gas recovery at a gas station includes several fuel dispensers 1b, several fuel pumps, fuel supply pipelines, several oil and gas recovery branch pipelines 31b, an oil and gas return main pipeline 3b, several oil tanks 4b, a gas flow meter 5b, and a gas station back-end computer system 2b. Each fuel dispenser 1b is equipped with several oil and gas recovery type fuel nozzles. Each oil and gas recovery type fuel nozzle is connected to the oil and gas recovery main pipeline 3b through several oil and gas recovery branch pipelines 31b. The oil tanks 4b are connected to the fuel dispensers 1b via fuel pumps and fuel supply pipelines. Each fuel dispenser 1b is connected to the gas station back-end computer system 2b via a communication line so that the gas station back-end computer system can collect the fueling data of each fuel dispenser and update the data at each oil and gas recovery branch pipeline. Each gas flow meter 5b is installed on pipeline 31b to collect the vapor recovery data of each fuel dispenser, or a gas flow meter 5b is installed on the vapor recovery main pipeline 3b to monitor the vapor recovery data of the entire gas station in real time. The gas station's back-end computer system then calculates the gas-liquid ratio of each transaction record for each vapor recovery fuel nozzle to determine whether each monitored fuel nozzle meets the regulatory requirements of the government. The feature is that an oil inlet detection device 100 is installed on the vapor recovery branch pipeline 31b of each vapor recovery fuel nozzle or fuel dispenser. When oil inlet is detected in the vapor recovery equipment while the vapor recovery fuel nozzle is working, the oil inlet detection device 100 sends an alarm signal to the gas station's back-end computer system to remind the back-end to repair it in time.

[0020] When oil is detected entering the vapor recovery equipment during operation of the vapor recovery type refueling nozzle, the oil inlet detection device 100 sends an alarm signal to the gas station's back-end computer system. Upon receiving the oil inlet information, the gas station's back-end computer system records the start and end times of the oil inlet information and the device number. Based on the time attribute and device number of the alarm signal, the gas station's back-end computer system matches the start and end times and nozzle number of the refueling nozzle corresponding to the vapor recovery process, determines the oil inlet status of a specific refueling nozzle, and issues an alarm.

[0021] The gas station's back-end computer system 2b includes a computer responsible for calculating and monitoring the vapor-liquid ratio of each transaction record for every vapor recovery refueling nozzle, thus achieving online monitoring of vapor recovery. The technical solution of the gas station's multi-flowmeter centralized online vapor recovery monitoring system is based on invention patent number CN2022103547645, and will not be described further here.

[0022] like Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7As shown, the oil inlet detection device 100 involved in this embodiment includes a valve body 1, an oil-gas separator 3, and a liquid level detection device 2. An oil collection and metering chamber 11 is arranged in the middle of the valve body 1, and the oil-gas separator 3 is arranged above the oil collection and metering chamber 11. An air inlet 12 and an air outlet 13 are provided in the valve body 1. The liquid level detection device 2 is installed inside the oil collection and metering chamber 11. An oil discharge outlet 14 is arranged at the bottom of the oil collection and metering chamber 11, and the oil discharge outlet 14 is connected to the air outlet 13. The oil and gas recovered by the fuel dispenser's oil and gas recovery equipment passes through... The air inlet 12 enters the valve body 1. The recovered oil and gas are separated by the oil-gas separation device 3 set above the oil metering chamber 11. The separated gas is discharged from the exhaust port 13, and the separated oil (i.e., oil droplets) enters the oil metering chamber 11 under the action of gravity. Then, it flows from the oil discharge port 14 at the bottom of the oil metering chamber to the exhaust port 13. The liquid level detection device 2 detects the liquid level height of the oil inside the oil metering chamber 11. When the liquid level height exceeds the set height, an alarm signal is sent out.

[0023] A one-way valve is installed on the air inlet 12 mentioned above, so that the oil and gas recovered by the fuel dispenser's oil and gas recovery equipment enters the valve body after passing through the one-way valve, thus preventing backflow.

[0024] The aforementioned oil-gas separation device 3 is a filter screen, which has a simple structure, is easy to manufacture, and has a low cost.

[0025] The liquid level detection device 2 mentioned above is a float-type liquid level detection device, an ultrasonic liquid level detection device, or a laser liquid level detection device.

[0026] The aforementioned liquid level detection device 2 includes a float 21, a float rod 22, and a liquid level sensor 23. The float 21 is fitted onto the float rod 22 and placed inside the oil collecting and measuring chamber 11. The liquid level sensor 23 is a switching assembly installed on the float rod 22. When the oil level in the oil collecting and measuring chamber 11 exceeds a set height, the float 21 moves upward along the float rod 22, triggering the liquid level sensor 23 to issue an alarm signal. The device has a simple structure, is easy to manufacture, and is reliable in operation. It also has low manufacturing costs.

[0027] The valve body 1 described above includes a main body 1c and a cover 1d. The cover 1d is installed at the top of the main body 1c. The oil metering chamber 11 is located in the middle of the main body 1c. An air inlet channel 15 is provided on the right side of the oil metering chamber 11, and an exhaust channel 16 is provided on the left side of the oil metering chamber 11. The air inlet 12 is connected to the bottom end of the air inlet channel 15, and the top end of the air inlet channel 15 is connected to the oil-gas separator 3. The oil-gas separator 3 uses the exhaust channel 16 to discharge the separated gas. The exhaust channel 16 is connected to the exhaust port 13. The top of the float rod 22 is installed on the cover 1d. The structure is simple and the layout is reasonable.

[0028] Both the exhaust port 13 and the air inlet 12 mentioned above are threaded to facilitate pipe connection.

[0029] The main body 1c is a flat block shape. The air inlet 12 is located on the right side of the main body 1c, and the exhaust port 13 is located on the bottom side of the main body 1c. The structure is simple and the layout is reasonable.

[0030] The size of the oil collection and metering chamber 11 and the size of the oil discharge port 14 are related to the monitoring level of the inflow rate of the incoming oil. If a float method is used to monitor the liquid level (i.e., a float-type liquid level detection device), when the oil discharge capacity of the oil discharge port 14 is greater than the inflow rate of the oil within a certain period of time, the float 21 will not float. When the oil discharge capacity of the oil discharge port 14 is less than the inflow rate of the oil within a certain period of time, the float 21 will float. When the oil accumulated in the oil collection and metering chamber 11 exceeds a certain volume, the float 21 will be at its highest position. With the space of the oil collection and metering chamber 11 remaining unchanged, the monitoring level of the inflow rate of the oil entering the oil and gas recovery equipment can be set by changing the size of the oil discharge port 14.

[0031] Assuming the flow rate at the discharge port when the float 21 rises to trigger the position switch height is 0.1 L / min, if the flow rate of oil entering the oil vapor recovery device is less than or equal to 0.1 L / min, the float will not rise to the height that triggers the liquid level sensor 23. If the flow rate of oil entering the oil vapor recovery device reaches 0.13 L / min or more, the amount of oil entering the oil collection and metering chamber 11 is greater than the amount of oil discharged. After the oil in the oil collection and metering chamber accumulates for a certain period of time, the float rises and triggers the liquid level sensor 23 to issue an oil inlet alarm for the oil vapor recovery device. If the oil collection chamber space M is 0.01L when float 21 triggers the switch, and ignoring the effect of liquid level difference on flow rate, the inlet oil flow rate is X: 0.13L / min, and the outlet oil flow rate is Y: 0.1L / min at metering port 14. The inlet oil time N is required to trigger the alarm, i.e., N = M / (XY) = 0.01 / (0.13-0.1) = 0.33 minutes, meaning the alarm is triggered after 20 seconds of inlet oil. With a single oil nozzle refueling flow rate of A: 38 liters / min, the alarm inlet rate K = X / A = 0.13 / 38 = 0.34%. If each refueling session is 50L and the refueling time is approximately 79 seconds (i.e., refueling time N), the minimum refueling alarm flow rate is X=M / N+Y=0.01 / 1.3+0.1=0.108L / minute, which means the alarm refueling rate K is 0.28%. This means that the abnormal refueling error rate is controlled within the nationally stipulated transaction error range of no more than 0.3%.

[0032] The advantages of this invention are as follows: the oil vapor recovered by the fuel dispenser's vapor recovery device enters the valve body through the exhaust port. The recovered oil vapor undergoes gas-liquid separation by an oil-gas separator located above the oil collection and metering chamber. The separated gas is discharged from the exhaust port, while the separated oil enters the oil collection and metering chamber and flows from the oil discharge outlet at the bottom of the chamber back to the exhaust port. A liquid level detection device monitors the oil level inside the oil collection and metering chamber. When the oil level exceeds a set height, an alarm signal is issued. This allows for timely detection of oil entering the fuel dispenser's vapor recovery device, preventing disputes between customers and gas stations regarding fuel quantity, increasing customer trust in gas stations, reducing customer complaints, avoiding widespread public and media attention, ensuring the normal operation of gas stations, and enhancing the gas station's brand image.

[0033] This embodiment provides an oil inlet detection device for a fuel dispenser's vapor recovery equipment. The device is installed in the vapor recovery pipe of the fuel dispenser's vapor recovery equipment to detect the oil content in the vapor and to issue an alarm when the limit is exceeded.

[0034] Example 2: This embodiment provides a method for detecting oil inlet in a centralized online monitoring system for oil and gas recovery at gas stations. The centralized online monitoring system for oil and gas recovery at gas stations adopts the system described in Embodiment 1. The method is characterized by the following: During the oil and gas recovery process at refueling, a malfunction in the oil and gas recovery equipment causes oil to enter the equipment. The oil and gas enter the valve body 1 and are separated by the oil and gas separator 3. The oil flows into the oil collection and metering chamber 11, while the gas flows into the oil and gas recovery pipeline through the exhaust port 13. When the inflow velocity of the oil entering the oil collection and metering chamber 11 is lower than the direct discharge velocity through the discharge port 14, the oil does not accumulate in the chamber, the liquid level does not rise, and the liquid level detection device 2 is not triggered. When the inflow velocity of the oil is greater than the discharge velocity through the discharge port 14, excess oil accumulates in the oil collection and metering chamber to a certain amount, the liquid level rises, and the liquid level detection device 2 issues an alarm signal.

[0035] The aforementioned liquid level detection device sends an alarm signal to the gas station's back-end computer system 2b. When the gas station's back-end computer system 2b receives the oil inlet information from the oil inlet detection device of the fuel dispenser's vapor recovery equipment, it records the start and end times of the oil inlet information and the device number. The vapor recovery online monitoring system matches the start and end times of refueling at the corresponding vapor recovery type fuel dispenser based on the time attribute and device number. If the oil inlet time overlaps with the refueling time, it determines that the oil inlet information corresponds to the fuel dispenser. This enables one oil inlet detection device to monitor whether the vapor recovery equipment is receiving oil when multiple vapor recovery type fuel dispensers are refueling.

[0036] Based on the above method, the oil inlet detection device for the oil vapor recovery equipment can be installed at a gas station, on a single fuel dispenser, or even on a single oil vapor recovery type fuel nozzle, enabling real-time monitoring of whether oil is entering the oil vapor recovery equipment of all fuel nozzles. As shown in Table 1 below, by correlating the alarm information from the oil inlet detection device with the refueling information of the oil vapor recovery type fuel nozzle on the time axis, the phenomenon of whether oil is entering the oil vapor recovery equipment during refueling can be obtained.

[0037]

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A centralized online monitoring system for oil and gas recovery at a gas station, comprising several fuel dispensers (1b), several oil pumps, oil supply pipelines, several oil and gas recovery branch pipelines (31b), an oil and gas return main pipeline (3b), several oil tanks (4b), a gas flow meter (5b), and a gas station back-end computer system (2b) installed at the gas station. Each fuel dispenser (1b) is equipped with several oil and gas recovery type fuel nozzles, and each oil and gas recovery type fuel nozzle is connected to the oil and gas recovery main pipeline (3b) through several oil and gas recovery branch pipelines (31b). The oil tanks (4b) are connected to the fuel dispensers (1b) via oil pumps and fuel supply pipelines. The system connects to the gas station's back-end computer system (2b) via a communication line, enabling the back-end computer system to collect refueling data from each fuel dispenser. A gas flow meter (5b) is installed on each branch pipeline (31b) of the vapor recovery system to collect vapor recovery data from each fuel dispenser, or a gas flow meter (5b) is installed on the main vapor recovery pipeline (3b) to monitor the vapor recovery data of the entire gas station in real time. The gas station's back-end computer system then calculates the gas-liquid ratio per transaction for each vapor recovery fuel dispenser, determining whether each monitored fuel dispenser meets the regulatory requirements of the government. Its features include: An oil inlet detection device (100) is installed on the oil and gas recovery branch pipe (31b) of each oil and gas recovery type refueling nozzle or a refueling machine. When it is found that there is oil inlet in the oil and gas recovery equipment when the oil and gas recovery type refueling nozzle is working, the oil inlet detection device (100) sends an alarm signal to the back-end computer system of the gas station to remind the back-end to repair in time. The oil inlet detection device (100) includes a valve body (1), an oil-gas separator (3), and a liquid level detection device (2). An oil collection and metering chamber (11) is located in the middle of the valve body (1), and the oil-gas separator (3) is located above the oil collection and metering chamber (11). An air inlet (12) and an exhaust outlet (13) are located on the valve body (1). The liquid level detection device (2) is installed inside the oil collection and metering chamber (11). An oil discharge outlet (14) is located at the bottom of the oil collection and metering chamber (11), and the oil discharge outlet (14) is connected to the exhaust outlet (13). The oil vapor recovery equipment of the fuel dispenser recovers the oil vapor... Oil and gas enter the valve body (1) through the air inlet (12). The recovered oil and gas are separated by the oil-gas separation device (3) set above the oil metering chamber (11). The separated gas is discharged from the exhaust port (13), and the separated oil enters the oil metering chamber (11). Then, it flows from the oil discharge port (14) at the bottom of the oil metering chamber (11) to the exhaust port (13). The liquid level detection device (2) detects the liquid level height of the oil inside the oil metering chamber (11). When the liquid level height of the oil exceeds the set height, an alarm signal is sent out. The valve body (1) includes a main body (1c) and a cover (1d). The cover (1d) is installed at the top of the main body (1c). The oil metering chamber (11) is located in the middle of the main body (1c). An air inlet channel (15) is provided on the right side of the oil metering chamber (11), and an exhaust channel (16) is provided on the left side of the oil metering chamber (11). The air inlet (12) is connected to the bottom end of the air inlet channel (15), and the top end of the air inlet channel (15) is connected to the filter screen (18). The oil-gas separation device (3) uses the exhaust channel (16) to discharge the separated gas. The exhaust channel (16) is connected to the exhaust port (13).

2. The centralized online monitoring system for oil and gas recovery at gas stations according to claim 1, characterized in that... When it is discovered that there is oil entering the vapor recovery equipment while the vapor recovery type refueling nozzle is working, the oil entry detection device (100) sends an alarm signal to the gas station's back-end computer system. When the gas station's back-end computer system receives the oil entry information, it records the start and end times of the oil entry information and the device number. Based on the time attribute and device number of the alarm signal, the gas station's back-end computer system matches the start and end times of refueling and the nozzle number of the corresponding refueling nozzle during vapor recovery, determines the oil entry status of a certain refueling nozzle corresponding to the oil entry information, and alarms.

3. A centralized online monitoring system for oil and gas recovery at gas stations according to claim 1 or 2, characterized in that... The oil-gas separator (3) is a filter screen (18).

4. The centralized online monitoring system for oil and gas recovery at gas stations according to claim 3, characterized in that... The liquid level detection device (2) is a float-type liquid level detection device, an ultrasonic liquid level detection device, or a laser liquid level detection device.

5. A centralized online monitoring system for oil and gas recovery at gas stations according to claim 4, characterized in that... The liquid level detection device (2) includes a float (21), a float rod (22) and a liquid level sensor (23). The float (21) is fitted on the float rod (22) and placed inside the oil collection and metering chamber (11). The liquid level sensor (23) is a switch assembly and is installed on the float rod (22). The top of the float rod (22) is installed on the cover (1d). When the liquid level of the oil in the oil collection and metering chamber (11) exceeds the set height, the float (21) moves up along the float rod (22) and touches the liquid level sensor (23), causing the liquid level sensor to issue an alarm signal.

6. The centralized online monitoring system for oil and gas recovery at gas stations according to claim 5, characterized in that... Both the exhaust port (13) and the air inlet (12) are threaded to facilitate pipe connection.

7. A centralized online monitoring system for oil and gas recovery at gas stations according to claim 6, characterized in that... The main body (1c) is a flat block shape. The air inlet (12) is located on the right side of the main body (1c), and the exhaust port (13) is located on the bottom surface of the main body (1c).

8. A method for detecting oil inlet in a centralized online monitoring system for oil and gas recovery at a gas station, wherein the centralized online monitoring system for oil and gas recovery at a gas station is the centralized online monitoring system for oil and gas recovery at a gas station as described in any one of claims 1 to 7, characterized in that: The method for detecting oil ingress is as follows: During the oil and gas recovery process at the refueling point, if the oil and gas recovery equipment malfunctions, oil will enter the oil and gas recovery equipment. The oil and oil and gas will enter the valve body (1) and be separated by the oil and gas separation device (3). The oil will flow into the oil collection and metering chamber (11), and the oil and gas will flow into the oil and gas recovery pipeline through the exhaust port (13). When the inflow velocity of the oil entering the oil collection and metering chamber (11) is lower than the direct discharge velocity through the oil discharge port (14), the oil will not accumulate in the oil collection and metering chamber (11), the liquid level will not rise, and the liquid level detection device (2) will not be triggered. When the inflow velocity of the oil is greater than the discharge velocity through the oil discharge port (14), the excess oil will accumulate to a certain amount in the oil collection and metering chamber, the liquid level will rise, and the liquid level detection device (2) will issue an alarm signal.

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