Oil gas recovery on-line detection device

Abstract

The utility model discloses an oil gas recovery on-line detection device which comprises an explosion-proof cabinet body, and two thermostats, a reversing valve, two EPC pressure controllers, a gas circuit box, two FID combustion chambers, two FID detectors, a PLC control system, a junction box, a transformer, an explosion-proof switch, two explosion-proof electric appliance cabinets and a hydrogen generator are arranged in the explosion-proof cabinet body. The accessories are electrically connected in series or in parallel; a pressure regulating filter valve and an audible and visual alarm are respectively arranged on the outer side surface of the explosion-proof cabinet body; a first air inlet and a second air inlet are formed in the side face of the anti-explosion cabinet body. According to the utility model, a double-range detection mode is adopted, and the inlet end and the outlet end of the oil gas recovery device are detected independently and do not interfere with each other, so that the detection precision is improved; nitrogen is introduced into the switch cabinet, so that positive pressure of the cabinet body can be kept, and external flammability is prevented from entering internal electrical equipment; meanwhile, moisture in sample gas can be taken away, and drying and cooling are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas recovery, in particular to an oil and gas recovery online detection device. Background Art

[0002] The oil and gas recovery devices currently on the market only recover the oil and gas volatilized during the loading and unloading of crude oil at the terminal / oil storage tank / gas station by condensation adsorption or CEB or other methods. They do not have the function of VOC online detection. Therefore, the online monitoring data cannot reflect the company's production management and pollution control situation, and the oil and gas emission concentration cannot be controlled, resulting in excessive emissions from the company and causing environmental pollution. Utility Model Content

[0003] The utility model aims to provide an oil and gas recovery online detection device in view of the defects and shortcomings of the prior art.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: an oil and gas recovery online detection device, including an explosion-proof cabinet, and its innovation lies in: two constant temperature boxes, a reversing valve, two EPC pressure controllers, a gas circuit box, two FID combustion chambers, two FID detectors, a PLC control system, a junction box, a transformer, an explosion-proof switch, two explosion-proof electrical cabinets and a hydrogen generator are respectively arranged in the explosion-proof cabinet, and the above-mentioned accessories are electrically connected in series or in parallel; a pressure regulating filter valve and an audible and visual alarm are respectively arranged on the external side of the explosion-proof cabinet; a first air inlet and a second air inlet are respectively opened on the side of the explosion-proof cabinet, the first air inlet is externally connected to the inlet end of the oil and gas recovery device, and the second air inlet is externally connected to the oil and gas recovery At the outlet end of the device, the first air inlet and the second air inlet are respectively connected to two thermostatic boxes through pipelines, the two thermostatic boxes are connected to reversing valves through pipelines, the reversing valves are respectively connected to two EPC pressure controllers through pipelines, the two EPC pressure controllers are connected to an air path box through pipelines, the two FID combustion chambers are respectively located on the upper and lower sides of the air path chamber, the air path box has a built-in quantitative ring, the quantitative rings are respectively connected to the FID combustion chambers, the hydrogen generator is connected to the two EPC pressure controllers through a pipeline, the pressure regulating filter valve is externally connected to a compressed air source and a nitrogen source, and is connected to the two EPC pressure controllers through a pipeline; a branch pipe is arranged on the input pipe of the nitrogen source, the branch pipe extends to the inside of the explosion-proof cabinet, and a solenoid valve is arranged.

[0005] Furthermore, an air pump and a pressure gauge are provided on the thermostatic box.

[0006] Furthermore, sampling probes are provided at both the inlet and outlet ends of the oil and gas recovery device, and high-temperature heating pipelines are provided on the pipes respectively connecting the first air inlet and the second air inlet at the inlet and outlet ends.

[0007] Furthermore, a touch screen is provided on the door of the explosion-proof cabinet, and the touch screen is electrically connected to the PLC control system.

[0008] Furthermore, the explosion-proof cabinet is a positive pressure explosion-proof cabinet.

[0009] After adopting the above structure, the utility model has the following beneficial effects:

[0010] 1. The utility model adopts a dual-range detection method to independently detect the inlet and outlet ends of the oil and gas recovery device without interfering with each other, thereby improving the detection accuracy;

[0011] 2. The utility model introduces nitrogen into the interior, which can maintain positive pressure in the cabinet and prevent external flammable substances from entering the internal electrical equipment; at the same time, it can take away moisture in the sample gas, dry and cool it; and it can reduce the atmospheric oxygen content in the online detection device environment to create a non-flammable environment.

[0012] 3. The utility model can process the non-methane total hydrocarbon content in the front and rear oil and gas, and make the treatment efficiency of the oil and gas recovery device more specific, visual and convenient, realize the detection of cross-level non-methane total hydrocarbon content, improve the environmental protection of the oil and gas recovery device, and urge enterprises to develop in the direction of environmental protection and sustainability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the internal structure of the utility model;

[0014] Figure 2 It is a schematic diagram of the external structure of the utility model.

[0015] Description of reference numerals:

[0016] 1 explosion-proof cabinet, 2 constant temperature box, 3 reversing valve, 4-EPC pressure controller, 5 gas circuit box, 6-FID combustion chamber, 7-FID detector, 8-PLC control system, 9 junction box, 10 transformer, 11 explosion-proof switch, 12 explosion-proof electrical cabinet, 13 hydrogen generator, 14 pressure regulating filter valve, 15 sound and light alarm, 16 first air inlet, 17 second air inlet, 18 branch pipe, 19 solenoid valve, 20 vacuum pump, 21 pressure gauge, 22 touch screen. DETAILED DESCRIPTION

[0017] The utility model is further described below in conjunction with the accompanying drawings.

[0018] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described here are only used to explain the utility model and are not used to limit the utility model.

[0019] See also Figure 1-2 An oil and gas recovery online detection device comprises an explosion-proof cabinet 1, in which two thermostats 2, a reversing valve 3, two EPC pressure controllers 4, a gas path box 5, two FID combustion chambers 6, two FID detectors 7, a PLC control system 8, a junction box 9, a transformer 10, an explosion-proof switch 11, two explosion-proof electrical cabinets 12 and a hydrogen generator 13 are arranged, and the above accessories are electrically connected in series or in parallel; a pressure regulating filter valve 14 and an audible and visual alarm 15 are arranged on the outer side of the explosion-proof cabinet 1; a first air inlet 16 and a second air inlet 17 are respectively opened on the side of the explosion-proof cabinet 1, the first air inlet 16 is externally connected to the inlet end of the oil and gas recovery device, and the second air inlet 17 is externally connected to the outlet of the oil and gas recovery device The first air inlet 16 and the second air inlet 17 are connected to two thermostatic boxes 2 through pipelines, the two thermostatic boxes 2 are connected to the reversing valve 3 through pipelines, the reversing valve 3 is connected to two EPC pressure controllers 4 through pipelines, the two EPC pressure controllers 4 are connected to the gas path box 5 through pipelines, the two FID combustion chambers 6 are respectively located on the upper and lower sides of the gas path chamber 5, the gas path box 6 has a built-in quantitative ring, the quantitative ring is connected to the FID combustion chamber, the hydrogen generator 13 is connected to the two EPC pressure controllers 4 through a pipeline, the pressure regulating filter valve 14 is externally connected to a compressed air source and a nitrogen source, and is connected to the two EPC pressure controllers 4 through a pipeline; a branch pipe 18 is arranged on the input pipe of the nitrogen source, the branch pipe 18 extends to the inside of the explosion-proof cabinet, and a solenoid valve 19 is arranged. Specifically, the sample gas at the inlet and outlet ends of the oil and gas recovery device enters the thermostat 2 from the first air inlet 16 and the second air inlet 17 respectively, and passes through the reversing valve 3 and the EPC pressure controller 4 in sequence after being heated by the thermostat 2. At the same time, the compressed air and nitrogen are filtered and pressure-regulated by the pressure-regulating filter valve 14 outside the explosion-proof cabinet, and then enter the EPC pressure controller 4 as a carrier gas. The hydrogen generator 13 generates a relatively low concentration of hydrogen as an auxiliary gas and also enters the EPC pressure controller 4 to form a mixed gas of compressed air, sample gas, hydrogen, and nitrogen, which is then quantified in the gas path box 5 that has been heated at high temperature, and then enters the FID combustion chamber 6 for combustion after quantification to generate an ionization signal and finally enter the F The detection is performed in the ID detector 7; when nitrogen is transported, a part of the nitrogen is transported through the branch pipe 18 and the solenoid valve 19 into the explosion-proof cabinet, which can maintain the positive pressure of the cabinet and prevent external flammable substances from entering the internal electrical equipment; at the same time, it can take away the moisture in the sample gas, dry and cool it; and it can reduce the atmospheric oxygen content in the environment of the online detection device to create a non-flammable environment; a pressure sensor is set in the explosion-proof cabinet, and when the pressure in the cabinet is lower than the set value, the solenoid valve 19 is opened to input nitrogen into the cabinet, and when the pressure reaches the set value, the solenoid valve 19 is closed; when the pressure value in the cabinet is too large, the pressure relief valve can be opened to relieve the pressure; the explosion-proof switch 11 and the explosion-proof electrical cabinet 12 both play an explosion-proof role.

[0020] The utility model can realize dual-range real-time multiple measurements of dual detection points, wherein the inlet end of the oil and gas recovery device is 300-500g / m 3 ppm, the outlet of the oil and gas recovery device is 0-30g / m 3 ppm, the detection of different concentrations does not interfere with each other. The PLC control system displays the measured content in real time on the touch screen, and automatically calculates the treatment efficiency of the oil and gas recovery device, completing the functions of data collection, processing, display, detection, transmission, and storage.

[0021] In this embodiment, an air pump 20 and a pressure gauge 21 are provided on the thermostat 2. After the air pump 20 is pneumatically activated, it starts to extract the sample gas before and after the oil gas recovery device is processed, thereby improving the working efficiency; the pressure gauge 21 monitors the pressure in the thermostat 2.

[0022] In this embodiment, sampling probes are provided at both the inlet and outlet of the oil and gas recovery device, and high-temperature heating pipelines are provided on the pipelines connected to the first air inlet 16 and the second air inlet 17 at the inlet and outlet, respectively. The sampling probes obtain sample gas; the high-temperature heating pipeline can prevent the viscosity of the liquid in the pipe from increasing, the pressure drop in the pipe from increasing, and the power consumption from increasing under low-temperature conditions, thus playing a role in energy saving; preventing the gas in the pipe from condensing with liquid, and preventing the gas in the pipe from carrying liquid under different working conditions, thus playing a role in avoiding electric heating lines and ensuring safety; preventing the pipe liquid or slurry from solidifying and causing the pipeline to be blocked, thus preventing the pipeline from being seriously scrapped, and playing a certain role in equipment maintenance; providing conditions for the normal operation of production instruments to meet the operating temperature requirements of various measuring instruments.

[0023] In this embodiment, a touch screen 22 is provided on the door of the explosion-proof cabinet 1, and the touch screen 22 is electrically connected to the PLC control system 8. The touch screen 22 interface can display the working status of the online detection device, the working status of each sensor and the current gas content digital fluctuation change, and the touch screen 22 can also be used to set and control the parameters of the online detection device.

[0024] In this embodiment, the explosion-proof cabinet is a positive pressure explosion-proof cabinet, which can improve the explosion-proof effect.

[0025] Positive pressure explosion-proof cabinet working process:

[0026] 1. When the air pressure is higher than 1000Pa, the pressure relief valve (built-in positive pressure explosion-proof cabinet) automatically opens the exhaust valve and automatically adjusts the internal air pressure to ensure that the product is not deformed or damaged by high pressure impact.

[0027] 2. When the air pressure is lower than 50Pa, the PLC control system will automatically sound an alarm and output an alarm signal. The internal pressure needs to be adjusted. When the air is replenished successfully, it will automatically return to normal. Otherwise, the system can be set to automatically power off if necessary.

[0028] 3. The working air pressure inside the positive pressure cabinet is 50Pa≤P≤1000Pa.

[0029] The working principle and workflow of this utility model:

[0030] Sampling: The online detection device is adjusted to the sampling mode and the equipment starts to run; the vacuum pump 20 starts to extract the sample gas before and after the treatment by the oil and gas recovery device. The extracted sample gas passes through the sampling probes located before and after the treatment by the oil and gas recovery device, and through the high-temperature heating pipeline, enters the two constant temperature boxes 2 built into the online detection device from the first air inlet 16 and the second air inlet 17 respectively. After the sample gas is preheated by the constant temperature box at high temperature, it passes through the reversing valve 3 and the EPC pressure controller 4 in turn, and then passes through the high-temperature heated gas path box 5 for quantification. After quantification, it enters the FID combustion chamber 6 for combustion, generates an ionization signal, and finally enters the FID detector 7 for detection.

[0031] Combustion: This online detection device is based on the internationally recognized gas chromatography method for measurement; there is a small hydrogen generator 13 inside the online detection device, which produces a relatively low concentration of hydrogen as the fuel gas of the FID detector 7; nitrogen is introduced into the online detection device as a carrier gas; the online detection device is externally connected to an air compressor, and the air compressor produces compressed air. The compressed air and nitrogen are then filtered and pressure-regulated by the pressure-regulating filter valve 14 on the outside of the explosion-proof cabinet as a combustion-supporting gas; the mixed gas of compressed air, sample gas, hydrogen and nitrogen is fully burned in the two FID combustion chambers 6 to produce rich ionization signals, which are captured and detected by the FID detector 7.

[0032] Quantitative: This online detection device automatically completes the collection, analysis, processing, transmission and storage of this series of data through the PLC control system 8; the PLC control system 8 compares the generated ionization signal with the data obtained when the standard gas is burned to obtain the quantitative analysis result of the sample gas, and at the same time obtains the processing efficiency of the oil and gas recovery device. This device reports data to the Environmental Protection Bureau based on information transmission technologies such as wireless GPRS, and the analysis results can be downloaded and stored locally.

[0033] The above description is only used to illustrate the technical solution of the utility model rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the utility model by ordinary technicians in this field should be included in the scope of the claims of the utility model as long as they do not depart from the spirit and scope of the technical solution of the utility model.

Claims

1. An oil and gas recovery online detection device, comprising an explosion-proof cabinet, characterized in that: Two thermostatic boxes, a reversing valve, two EPC pressure controllers, a gas circuit box, two FID combustion chambers, two FID detectors, a PLC control system, a junction box, a transformer, an explosion-proof switch, two explosion-proof electrical cabinets and a hydrogen generator are respectively arranged in the explosion-proof cabinet, and the thermostatic boxes, the reversing valve, the EPC pressure controller, the gas circuit box, the FID combustion chamber, the FID detector, the PLC control system, the junction box, the transformer, the explosion-proof switch, the explosion-proof electrical cabinet and the hydrogen generator are electrically connected in series or in parallel; a pressure regulating filter valve and an audible and visual alarm are respectively arranged on the external side of the explosion-proof cabinet; a first air inlet and a second air inlet are respectively arranged on the side of the explosion-proof cabinet, the first air inlet is externally connected to the inlet end of the oil and gas recovery device, and the second air inlet is externally connected to the inlet end of the oil and gas recovery device. The air port is externally connected to the outlet end of the oil and gas recovery device, the first air inlet and the second air inlet are respectively connected to two constant temperature boxes through pipelines, the two constant temperature boxes are connected to the reversing valve through pipelines, the reversing valves are respectively connected to two EPC pressure controllers through pipelines, the two EPC pressure controllers are connected to the air path box through pipelines, the two FID combustion chambers are respectively located on the upper and lower sides of the air path chamber, the air path box has a built-in quantitative ring, the quantitative rings are respectively connected to the FID combustion chambers, the hydrogen generator is connected to the two EPC pressure controllers through a pipeline, the pressure regulating filter valve is externally connected to a compressed air source and a nitrogen source, and is connected to the two EPC pressure controllers through a pipeline; a branch pipe is arranged on the input pipe of the nitrogen source, the branch pipe extends to the inside of the explosion-proof cabinet, and a solenoid valve is arranged.

2. The oil and gas recovery online detection device according to claim 1, characterized in that: The constant temperature box is provided with an air pump and a pressure gauge.

3. The oil and gas recovery online detection device according to claim 1, characterized in that: The inlet and outlet ends of the oil and gas recovery device are both provided with sampling probes, and high-temperature heating pipelines are provided on the pipelines respectively connecting the first air inlet and the second air inlet at the inlet and outlet ends.

4. The oil and gas recovery online detection device according to claim 1, characterized in that: A touch screen is arranged on the cabinet door of the explosion-proof cabinet, and the touch screen is electrically connected to the PLC control system.

5. The oil and gas recovery online detection device according to claim 1, characterized in that: The explosion-proof cabinet is a positive pressure explosion-proof cabinet.

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