Online monitoring control system for oil and gas recovery of gas station

Abstract

The utility model provides an oil gas recovery on-line monitoring control system of a gas station, which relates to the technical field of oil gas recovery monitoring and comprises an oil gas recovery function oil gun, a pump, a proportional valve, a vortex shedding flowmeter, a safety barrier, a gas-liquid ratio controller, a data acquisition module, an oil charge encoder and a data analysis terminal. Aiming at a fixed-frequency pump or a variable-frequency pump, the gas-liquid ratio can be accurately measured and controlled in complex environments such as on-site vibration interference and pulsating flow of the oiling machine, the gas flow precision is improved to + / -1% from + / -2% of the standard requirement, and when the problems of pump attenuation, pipeline damage, oil gun abnormity and the like in the oiling machine occur, the gas-liquid ratio can be accurately measured and controlled. The system can directly judge problem points and accurately troubleshoot fault points, realizes stable wireless transmission for wired reconstruction construction from a field measurement end of a current online monitoring system to a station-level control system, and prevents safety risks of wiring construction in explosion dangerous areas.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas recovery monitoring, in particular to an on-line monitoring and control system for oil and gas recovery at gas stations. Background Art

[0002] In order to reduce the emission of volatile organic compounds (VOCs) at gas stations, the national mandatory standard "Emission Standard of Atmospheric Pollutants for Gas Stations" (GB 20952-2020) requires gas stations to install an on-line oil and gas recovery monitoring system according to the requirements of local governments to achieve continuous compliance with environmental protection for oil and gas recovery at gas stations.

[0003] At present, some gas stations have installed an on-line oil and gas recovery monitoring system, but the system often detects inaccurate data during operation and cannot accurately achieve closed-loop control. In addition, when the detected data is abnormal or the oil and gas recovery equipment fails to operate, it is impossible to predict the operating status of the equipment in advance and accurately locate the fault point, resulting in great challenges for the continuous compliance of the oil and gas recovery gas-liquid ratio at gas stations. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the problems existing in the prior art that the detected data is often inaccurate during operation, the closed-loop control cannot be accurately achieved, and at the same time, the operating status of the equipment cannot be predicted in advance and the fault point cannot be accurately located, resulting in great challenges for the continuous compliance of the oil and gas recovery gas-liquid ratio at gas stations, and an on-line monitoring and control system for oil and gas recovery at gas stations is proposed.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme: an on-line monitoring and control system for oil and gas recovery at gas stations, including an oil and gas recovery function fuel gun, a pump, a proportional valve, a vortex flowmeter, a safety barrier, a gas-liquid ratio controller, a data acquisition module, a fuel quantity encoder and a data analysis terminal. The return air pipeline of the oil and gas recovery function fuel gun is first connected in series with the vortex flowmeter. The pump is connected in series with the proportional valve, or the pump is directly connected to the vortex flowmeter. The pump returns to the underground oil tank through the oil and gas circuit. The vortex flowmeter is connected to the safety barrier and then connected to the gas-liquid ratio controller. The pump or the proportional valve is directly connected to the gas-liquid ratio controller. The fuel quantity encoder is directly connected to the gas-liquid ratio controller. The gas-liquid ratio controller is then connected to the data acquisition module. The data acquisition module can be connected to multiple gas-liquid ratio controllers. The data acquisition module is wirelessly connected to the data analysis terminal;

[0006] The vortex flowmeter uploads the oil and gas recovery volume to the gas-liquid ratio controller; the gas-liquid ratio controller simultaneously collects the refueling volume data of the refueling volume encoder, calculates the gas-liquid ratio through the gas extraction volume and the refueling volume. According to the measured value of the gas-liquid ratio, the gas-liquid ratio controller controls the opening of the proportional valve by adjusting the duty cycle of the pulse signal to control the gas extraction volume of the oil and gas, or controls the gas extraction volume of the variable frequency pump through frequency, so as to keep the gas-liquid ratio within the specified range; one end of the data acquisition module can be connected to multiple gas-liquid ratio controllers, and the other end is connected to the data analysis terminal wirelessly; the display terminal is used for intelligent analysis and processing of data.

[0007] Preferably, according to the measured value of the gas-liquid ratio, the gas-liquid ratio controller controls the opening of the proportional valve by adjusting the duty cycle of the pulse signal to control the gas extraction volume of the oil and gas, or controls the gas extraction volume of the variable frequency pump through frequency, so as to keep the gas-liquid ratio within the specified range.

[0008] Preferably, the data acquisition module simultaneously collects the data of multiple gas-liquid ratio controllers and uploads them to the data analysis terminal through the wireless transmission function.

[0009] Preferably, the vortex flowmeter includes a flow detection probe and a vibration detection probe. The vibration detection probe is used to pick up vibration signals. The flow detection probe has the dual functions of flow and vibration detection to achieve anti-vibration of the flowmeter.

[0010] Preferably, the data analysis terminal consists of a gas-liquid ratio display and alarm module, a fault analysis module and a fault push module. The gas-liquid ratio display and alarm module is used for the display of gas-liquid ratio data and the alarm of abnormal gas-liquid ratio. The fault analysis module realizes the fault early warning and fault location functions of the oil and gas recovery pipeline, recovery pump or fuel gun by analyzing the duty cycle of the control proportional valve or the frequency of the variable frequency pump. The fault push module accurately notifies the management personnel of the fault information.

[0011] Compared with the prior art, the advantages and positive effects of the present utility model are as follows.

[0012] 1. In the present utility model, for both fixed-frequency pumps and variable frequency pumps, this solution can achieve accurate measurement and control of the gas-liquid ratio in complex environments such as on-site vibration interference and pulsating flow of the fuel dispenser, and improve the gas flow accuracy from the standard requirement of ±2% to ±1%.

[0013] 2. In the present utility model, when problems such as attenuation of the pump, pipeline damage, and abnormal fuel gun occur in the fuel dispenser, the system can directly judge the problem point and accurately locate the fault point.

[0014] 3. In the present utility model, for the wired transformation construction of the on-site measurement end to the station-level control system of the current online monitoring system, stable wireless transmission is realized to prevent the safety risks of wiring construction in explosion-hazardous areas.

[0015] 4. In the present utility model, in view of the fact that the existing monitoring system finds that the liquid-to-gas ratio is unqualified and manual adjustment is required, the system automatically adjusts the frequency conversion pump and the proportional regulating valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the on-line monitoring and control system for oil and gas recovery at gas stations proposed by the present utility model;

[0017] Figure 2 It is a schematic diagram of the liquid-to-gas ratio control of the on-line monitoring and control system for oil and gas recovery at gas stations proposed by the present utility model;

[0018] Figure 3 It is a schematic diagram of the connection between multiple liquid-to-gas ratio controllers and the data acquisition module of the on-line monitoring and control system for oil and gas recovery at gas stations proposed by the present utility model;

[0019] Figure 4 It is a schematic diagram of the structure of the vortex flowmeter of the on-line monitoring and control system for oil and gas recovery at gas stations proposed by the present utility model;

[0020] Figure 5 It is a schematic diagram of the composition of the data analysis terminal of the on-line monitoring and control system for oil and gas recovery at gas stations proposed by the present utility model.

[0021] Legend Explanation: 1. Oil and gas recovery function fuel dispenser nozzle; 2. Vortex flowmeter; 3. Proportional valve; 4. Safety barrier; 5. Liquid-to-gas ratio controller; 6. Data acquisition module; 7. Fuel volume encoder; 8. Pump; 9. Underground oil tank; 10. Data analysis terminal; 11. Liquid-to-gas ratio display and alarm; 12. Fault analysis module; 13. Fault push module; 14. Vibration detection probe; 15. Flow detection probe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] In order to more clearly understand the above-mentioned objects, features and advantages of the present utility model, the present utility model will be further described below with reference to the drawings and embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

[0023] In the following description, many specific details are set forth in order to fully understand the present utility model. However, the present utility model may be implemented in other ways different from those described herein. Therefore, the present utility model is not limited by the specific embodiments disclosed in the following specification.

[0024] Embodiment 1

[0025] Refer to Figures 1-5As shown in the figure: The on-line monitoring and control system for oil and gas recovery at gas stations includes an oil and gas recovery function fuel nozzle 1, a pump 8, a proportional valve 3, a vortex flowmeter 2, a safety barrier 4, a gas-liquid ratio controller 5, a data acquisition module 6, a fuel volume encoder 7, and a data analysis terminal 10. The return air pipeline of the oil and gas recovery function fuel nozzle 1 is first connected in series with the vortex flowmeter 2. The pump 8 is connected in series with the proportional valve 3, or the pump 8 is directly connected to the vortex flowmeter 2. The pump 8 returns to the underground oil tank 9 through the oil and gas circuit. After the vortex flowmeter 2 is connected to the safety barrier 4, it is connected to the gas-liquid ratio controller 5. The pump 8 or the proportional valve 3 is directly connected to the gas-liquid ratio controller 5. The fuel volume encoder 7 is directly connected to the gas-liquid ratio controller 5. The gas-liquid ratio controller 5 is then connected to the data acquisition module 6. The data acquisition module 6 can be connected to multiple gas-liquid ratio controllers 5. The data acquisition module 6 is wirelessly connected to the data analysis terminal 10;

[0026] The vortex flowmeter 2 uploads the oil and gas recovery volume to the gas-liquid ratio controller 5; the gas-liquid ratio controller 5 simultaneously collects the fuel volume data of the fuel volume encoder 7, calculates the gas-liquid ratio through the gas extraction volume and the fuel volume, and according to the measured value of the gas-liquid ratio, the gas-liquid ratio controller 5 controls the opening of the proportional valve 3 by adjusting the duty cycle of the pulse signal to control the gas extraction volume of the oil and gas, or controls the gas extraction volume of the variable frequency pump through frequency control, so as to keep the gas-liquid ratio value within the specified range; one end of the data acquisition module 6 can be connected to multiple gas-liquid ratio controllers 5, and the other end is connected to the data analysis terminal 10 through a wireless method; the display terminal is used for intelligent analysis and processing of data.

[0027] As Figure 2 shown, according to the measured value of the gas-liquid ratio, the gas-liquid ratio controller 5 controls the opening of the proportional valve by adjusting the duty cycle of the pulse signal to control the gas extraction volume of the oil and gas, or controls the gas extraction volume of the variable frequency pump through frequency control, so as to keep the gas-liquid ratio value within the specified range.

[0028] As Figure 3 shown, the data acquisition module 6 simultaneously collects the data of multiple gas-liquid ratio controllers 5 and uploads it to the data analysis terminal 10 through the wireless transmission function.

[0029] As Figure 4 shown, the vortex flowmeter 2 includes a flow detection probe 15 and a vibration detection probe 14. The vibration detection probe 14 is used to pick up vibration signals. The flow detection probe has the dual functions of flow and vibration detection to achieve anti-vibration of the flowmeter.

[0030] As Figure 5As shown in the figure, the data analysis terminal 10 is composed of a gas-liquid ratio display and alarm module 11, a fault analysis module 12, and a fault push module 13. The gas-liquid ratio display and alarm module 11 is used for the display of gas-liquid ratio data and the alarm for abnormal gas-liquid ratio. The fault analysis module 12 realizes the functions of fault early warning and fault location for the oil-gas recovery pipeline, recovery pump, or fuel dispenser by analyzing and controlling the duty ratio of the proportional valve or the frequency of the variable-frequency pump. The fault push module 13 accurately notifies the management personnel of the fault information.

[0031] The working principle of this embodiment: During use, the vortex flowmeter 2 uploads the oil-gas recovery volume to the gas-liquid ratio controller 5; the gas-liquid ratio controller 5 simultaneously collects the fuel volume data of the fuel volume encoder 7, calculates the gas-liquid ratio through the gas extraction volume and the fuel volume, and according to the measured value of the gas-liquid ratio, controls the opening of the proportional valve 3 by adjusting the duty ratio of the pulse signal to control the gas extraction volume of the oil-gas or controls the gas extraction volume of the variable-frequency pump through frequency, so as to keep the gas-liquid ratio within the specified range; one end of the data acquisition module 6 can be connected to multiple gas-liquid ratio controllers 5, and the other end is connected to the data analysis terminal 10 wirelessly; the vibration detection probe 14 of the vortex flowmeter is used to pick up the vibration signal. The flow detection probe has the dual functions of flow and vibration detection to realize the anti-vibration of the flowmeter. The display terminal is used for the intelligent analysis and processing of data. Among them, the gas-liquid ratio display and alarm 11 is used for the display of gas-liquid ratio data and the alarm for abnormal gas-liquid ratio. The fault analysis module 12 realizes the functions of fault early warning and fault location for the oil-gas recovery pipeline, recovery pump, or fuel dispenser by analyzing and controlling the duty ratio of the proportional valve or the frequency of the variable-frequency pump. The fault push module 13 accurately notifies the management personnel of the fault information.

[0032] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention in other forms. Any person skilled in the art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution content of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims

1. Online monitoring and control system for oil and gas recovery at gas stations, characterized in that: It includes a fuel dispenser nozzle (1) with vapor recovery function, a pump (8), a proportional valve (3), a vortex flowmeter (2), a safety barrier (4), a vapor-to-liquid ratio controller (5), a data acquisition module (6), a fuel quantity encoder (7), and a data analysis terminal (10). The return air pipe of the fuel dispenser nozzle (1) with vapor recovery function is first connected in series with the vortex flowmeter (2). The pump (8) is connected in series with the proportional valve (3), or the pump (8) is directly connected to the vortex flowmeter (2). The pump (8) returns to the underground storage tank (9) through the vapor circuit. The vortex flowmeter (2) is connected to the safety barrier (4) and then connected to the vapor-to-liquid ratio controller (5). The pump (8) or the proportional valve (3) is directly connected to the vapor-to-liquid ratio controller (5). The fuel quantity encoder (7) is directly connected to the vapor-to-liquid ratio controller (5). The vapor-to-liquid ratio controller (5) is then connected to the data acquisition module (6). The data acquisition module (6) can be connected to multiple vapor-to-liquid ratio controllers (5). The data acquisition module (6) is connected to the data analysis terminal (10) wirelessly; The vortex flowmeter (2) uploads the vapor recovery quantity to the vapor-to-liquid ratio controller (5); the vapor-to-liquid ratio controller (5) simultaneously collects the fuel quantity data of the fuel quantity encoder (7), calculates the vapor-to-liquid ratio through the extraction gas volume and the fuel quantity, and according to the measured value of the vapor-to-liquid ratio, controls the opening of the proportional valve (3) by adjusting the duty ratio of the pulse signal to control the extraction gas volume of the vapor or controls the extraction gas volume of the variable frequency pump through frequency, so as to keep the vapor-to-liquid ratio within the specified range; one end of the data acquisition module (6) can be connected to multiple vapor-to-liquid ratio controllers (5), and the other end is connected to the data analysis terminal (10) wirelessly; the display terminal is used for intelligent analysis and processing of data.

2. The on-line monitoring and control system for gasoline station oil and gas recovery according to claim 1, characterized in that: The vapor-to-liquid ratio controller (5) controls the opening of the proportional valve to control the extraction gas volume of the vapor or controls the extraction gas volume of the variable frequency pump through frequency by adjusting the duty ratio of the pulse signal according to the measured value of the vapor-to-liquid ratio, so as to keep the vapor-to-liquid ratio within the specified range.

3. The on-line monitoring and control system for gasoline station vapor recovery according to claim 1, characterized in that: The data acquisition module (6) simultaneously collects the data of multiple vapor-to-liquid ratio controllers (5) and uploads it to the data analysis terminal (10) through the wireless transmission function.

4. The online monitoring and control system for gasoline station oil and gas recovery according to claim 1, characterized in that: The vortex flowmeter (2) includes a flow detection probe (15) and a vibration detection probe (14). The vibration detection probe (14) is used to pick up vibration signals. The flow detection probe (15) has the dual functions of flow and vibration detection to achieve anti-vibration of the flowmeter.

5. The on-line monitoring and control system for gasoline station oil and gas recovery according to claim 1, characterized in that: The data analysis terminal (10) is composed of a vapor-to-liquid ratio display and alarm module (11), a fault analysis module (12), and a fault push module (13). Among them, the vapor-to-liquid ratio display and alarm module (11) is used for the display of vapor-to-liquid ratio data and the alarm for abnormal vapor-to-liquid ratio. The fault analysis module (12) realizes the functions of fault warning and fault location of the vapor recovery pipeline, recovery pump, or fuel dispenser nozzle by analyzing and controlling the duty ratio of the proportional valve or the frequency of the variable frequency pump. The fault push module (13) accurately notifies the management personnel of the fault information.

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