Station fixed type high-precision gas leakage monitoring device

Abstract

The utility model provides a station fixed type high-precision gas leakage monitoring device, which relates to the field of gas leakage monitoring, and comprises a sampling assembly and a natural gas leakage monitoring assembly, the sampling assembly comprises a box body and a plurality of sampling gas inlets arranged on the box body, each sampling gas inlet is connected with a gas inlet pipeline, and a gas outlet pipeline is arranged on the box body. A valve is arranged on the gas inlet pipeline, a sampling pump is further arranged in the box body, a gas outlet of the sampling pump is connected with a transmission pipeline, the transmission pipeline is in conduction connection with a natural gas leakage monitoring assembly, and the natural gas leakage monitoring assembly is used for monitoring the methane concentration of air transmitted by the monitoring pipeline; the natural gas leakage monitoring assembly at least comprises a methane gas analyzer. The gas leakage monitoring device has the advantage of improving the precision and efficiency of gas leakage monitoring.

Description

Technical Field

[0001] This utility model relates to the field of gas leak monitoring, and in particular to a station-mounted high-precision gas leak monitoring device. Background Technology

[0002] In modern industry and energy production, ensuring the safe operation of gas systems is crucial. Gas leaks can not only lead to major safety accidents such as explosions and fires, but also have long-term negative impacts on the environment, such as air pollution and greenhouse gas emissions. Therefore, effective gas leak detection technology is a fundamental requirement for ensuring production safety and environmental protection.

[0003] Existing gas leak detection devices typically rely on fixed monitoring points or handheld detection equipment. These methods often fail to provide immediate or comprehensive leak detection due to limited monitoring points, long response times, or low sensitivity to environmental conditions. Furthermore, these gas leak detection devices mostly depend on a single type of sensor, such as semiconductor or infrared sensors, whose stability and accuracy in complex industrial environments are often limited by interference from the surrounding environment.

[0004] Therefore, there is a need to provide a station-mounted high-precision gas leak monitoring device to improve the accuracy and efficiency of gas leak monitoring. Utility Model Content

[0005] This utility model provides a station-mounted high-precision gas leak monitoring device, including a sampling component and a natural gas leak monitoring component. The sampling component includes a housing and multiple sampling inlets on the housing. Each sampling inlet is connected to an inlet pipe, and a valve is installed on the inlet pipe. A sampling pump is also installed inside the housing. An outlet is also provided on the housing and connected to a transmission pipe. The transmission pipe is electrically connected to the natural gas leak monitoring component. The natural gas leak monitoring component is used to monitor the methane concentration of the air transmitted through the transmission pipe. The natural gas leak monitoring component includes at least a methane gas analyzer.

[0006] Furthermore, the valve is a two-position three-way solenoid valve, with its inlet port connected to the inlet pipe and its outlet port connected to the sampling inlet.

[0007] Furthermore, the sampling component also includes an interlock circuit, wherein the interlock circuit is used to control that only one of the two-position three-way solenoid valves is activated at any given time.

[0008] Furthermore, the natural gas leak monitoring component also includes a display, a temperature and humidity monitoring device, and a wind direction and speed meter. The display is used to display the ambient temperature and humidity information collected by the temperature and humidity monitoring device, as well as the wind direction and speed information collected by the wind direction and speed meter.

[0009] Furthermore, the sampling component also includes a positioning component for acquiring the position information of the sampling component.

[0010] Furthermore, a filter is also installed inside the air intake pipe.

[0011] Furthermore, the sampling component also includes a switching power supply for converting 220V AC power into 12V DC power.

[0012] Furthermore, the methane gas analyzer includes a light source, an optical path assembly, a gas chamber, a detector, and an analyzer. The light source is used to provide infrared radiation, the optical path assembly is used to guide the infrared radiation through the gas chamber, the detector receives the light that changes after passing through the gas chamber and converts it into an electrical signal, and the analyzer is used to calculate the concentration of methane gas based on the electrical signal.

[0013] Furthermore, the methane gas analyzer also includes a temperature protection component, which includes a temperature sensor, a temperature protection switch, and a first alarm. The temperature sensor is used to sense the temperature of the gas chamber. The temperature protection switch includes a first voltage comparator and a first transistor switch. The first transistor switch is connected in series between the power supply and the first alarm. The output terminal of the temperature sensor is electrically connected to the non-inverting input terminal of the first voltage comparator. The inverting input terminal of the first voltage comparator receives a first reference voltage. The output terminal of the first voltage comparator is electrically connected to the base of the first transistor switch.

[0014] Furthermore, the methane gas analyzer also includes a humidity protection component, which includes a humidity sensor, a humidity protection switch, and a second alarm. The humidity sensor is used to sense the humidity of the gas chamber. The humidity protection switch includes a second voltage comparator and a second transistor switch. The second transistor switch is connected in series between the power supply and the second alarm. The output terminal of the humidity sensor is electrically connected to the non-inverting input terminal of the second voltage comparator. The inverting input terminal of the second voltage comparator receives a second reference voltage. The output terminal of the second voltage comparator is electrically connected to the base of the second transistor switch.

[0015] Compared with existing technologies, the station-mounted high-precision gas leak monitoring device provided by this utility model has at least the following beneficial effects:

[0016] A sampling assembly with five air inlet channels is employed, and valves automatically switch the air inlets to enable periodic sampling of air samples from different monitoring points, ensuring the representativeness and continuity of the samples. A methane gas analyzer is used to monitor the methane concentration in each sample in real time, ensuring a rapid response to leaks. Attached Figure Description

[0017] This specification will be further described by way of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting; in these embodiments, the same reference numerals denote the same structures, wherein:

[0018] Figure 1 This is a structural schematic diagram of a station-mounted high-precision gas leak monitoring device according to some embodiments of this specification;

[0019] Figure 2 This is a front view of the sampling component shown in some embodiments of this specification;

[0020] Figure 3 This is a schematic diagram of the internal structure of the sampling component shown in some embodiments of this specification.

[0021] In the diagram, 1 is the sampling component; 11 is the housing; 12 is the sampling inlet; 13 is the sampling pump; 14 is the outlet; 15 is the transmission pipeline; 16 is the switching power supply; 17 is the inlet pipeline; and 2 is the natural gas leak monitoring component. Detailed Implementation

[0022] To more clearly illustrate the technical solutions of the embodiments in this specification, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of this specification. For those skilled in the art, these drawings can be applied to other similar scenarios without creative effort. Unless obvious from the context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.

[0023] Figure 1 This is a structural schematic diagram of a station-mounted high-precision gas leak monitoring device according to some embodiments of this specification, such as... Figure 1 As shown, a station-mounted high-precision gas leak monitoring device may include a sampling component 1 and a natural gas leak monitoring component 2.

[0024] Figure 2 This is a front view of the sampling component 1 shown in some embodiments of this specification. Figure 3 This is a schematic diagram of the internal structure of the sampling component 1 shown in some embodiments of this specification, such as... Figures 2-3As shown, the sampling component 1 includes a housing 11 and multiple sampling air inlets 12 opened on the housing 11. Each sampling air inlet 12 is connected to an air inlet pipe 17, and a valve is installed on the air inlet pipe 17. A sampling pump 13 is also installed inside the housing 11. An air outlet 14 is also opened on the housing 11, and the air outlet 14 is connected to a transmission pipe 15. The transmission pipe 15 is electrically connected to the natural gas leak monitoring component 2. The natural gas leak monitoring component 2 is used to monitor the methane concentration of the air transmitted through the transmission pipe.

[0025] As an example, five monitoring points can be set up at key locations in the site, for example, three evenly distributed downwind and two evenly distributed elsewhere, to achieve comprehensive monitoring of the site at the lowest cost. Five air inlet pipes 17 with an inner diameter of 4mm are used to connect to five sampling air inlets 12 of the sampling assembly 1. The end of the air inlet pipe 17 furthest from the sampling air inlet 12 is located at the monitoring point. The continuity of the air inlet pipe 17 can be controlled by valves. The sampling pump 13 draws air from the monitoring point where the air inlet pipe 17 is located through the connected air inlet pipe 17 and transmits the air to the natural gas leak monitoring assembly 2 through the transmission pipe 15 for methane concentration monitoring.

[0026] When sampling pump 13 is operational, the intake flow rate of intake pipe 17, which is in the conductive state, is stable at approximately 3.7 L / min. Intake pipe 17 can be switched manually or via software. For example, the running time of each channel can be set on the main interface of the valve control software.

[0027] Preferably, a filter is also installed inside the air intake duct 17.

[0028] Preferably, the valve is a two-position three-way solenoid valve, with the air inlet port of the two-position three-way solenoid valve connected to the air inlet pipe 17, and one air outlet port of the two-position three-way solenoid valve connected to the sampling air inlet 12.

[0029] Specifically, when the two-position three-way solenoid valve is energized, the intake pipe 17 is opened.

[0030] Preferably, the sampling component 1 also includes an interlock circuit, wherein the interlock circuit is used to control that only one two-position three-way solenoid valve is activated at any given time.

[0031] Specifically, the interlock circuit may include a first relay, a second relay, a third relay, a fourth relay, and a fifth relay. The normally open contact of the first relay is connected in series between the power supply and the three-way solenoid valve of the first intake pipe 17; the normally closed contact of the first relay is connected in series between the power supply and the three-way solenoid valve of the second intake pipe 17; the normally closed contact of the second relay is connected in series between the power supply and the three-way solenoid valve of the second intake pipe 17; the normally closed contact of the second relay is connected in series between the power supply and the three-way solenoid valve of the third intake pipe 17; and the normally closed contact of the third relay is connected in series with the power supply and the three-way solenoid valve of the third intake pipe 17. The normally closed contact of the third relay is connected between the power supply and the three-way solenoid valve of the third intake pipe 17. The normally closed contact of the fourth relay is connected between the power supply and the three-way solenoid valve of the fourth intake pipe 17. The normally closed contact of the fourth relay is connected between the power supply and the three-way solenoid valve of the fifth intake pipe 17. The normally closed contact of the fifth relay is connected between the power supply and the three-way solenoid valve of the fifth intake pipe 17. The normally closed contact of the fifth relay is connected between the power supply and the three-way solenoid valve of the first intake pipe 17.

[0032] By setting up an interlock circuit, it is ensured that only one two-position three-way solenoid valve is activated at any given time, meaning that only one intake pipe 17 is in the conducting state, thus preventing air sample mixing and facilitating the tracing of gas leaks.

[0033] Preferably, the sampling component 1 also includes a switching power supply 16 for converting 220V AC power to 12V DC power.

[0034] Preferably, the sampling component 1 further includes a positioning component for acquiring the position information of the sampling component 1.

[0035] Preferably, the natural gas leak monitoring component 2 also includes a display, a temperature and humidity monitoring device, and a wind direction and speed meter. The display is used to show the ambient temperature and humidity information collected by the temperature and humidity monitoring device and the wind direction and speed information collected by the wind direction and speed meter.

[0036] Specifically, the natural gas leak monitoring component 2 can send collected methane concentration, ambient temperature and humidity, wind direction, and wind speed information to the backend. The backend can then comprehensively analyze the methane concentration, wind speed, and wind direction data to calculate the natural gas leak flow rate and achieve a quantitative assessment of the leak. The backend can display the geographical locations of all monitoring points on an electronic map. Monitoring points that detect natural gas leaks (above a set threshold) are marked on the map and reports for different time periods are generated, including concentration anomalies and statistics for all monitoring points during that period. Multiple contact numbers can be set, and the backend can send SMS notifications when a leak alarm occurs; the SMS message includes the monitoring point number and methane concentration increment information.

[0037] Preferably, the methane gas analyzer includes a light source, an optical path assembly, a gas chamber, a detector, and an analyzer. The light source provides infrared radiation, the optical path assembly guides the infrared radiation through the gas chamber, the detector receives the light that changes after passing through the gas chamber and converts it into an electrical signal, and the analyzer calculates the concentration of methane gas based on the electrical signal.

[0038] Its working principle is to determine the concentration of a certain substance in a gas by utilizing the interaction between light and molecules in a gas mixture. The output wavelength of the laser is tuned to match the characteristic absorption lines of the gas in the optical path. By measuring the intensity change of the absorbed light, the concentration of the target substance in the gas can be inferred. Methane and ethane gas molecules have a relatively high absorption intensity in the 3-4 μm mid-infrared band. Therefore, mid-infrared direct absorption spectroscopy based on a multi-pass absorption cell structure can detect trace methane and ethane concentrations in the atmospheric environment in real time with ppb-level accuracy. The methane gas analyzer effectively increases the optical path by forming a multi-pass absorption cell using mirrors, which can improve the signal-to-noise ratio and resolution. It uses the mid-infrared band (around 3.31 μm) as the absorption spectrum of methane. Compared with analyzers based on near-infrared absorption spectroscopy (around 1.66 μm), it can obtain the same absorption over a shorter optical path length, and has the advantages of simple structure, high measurement accuracy, and good real-time performance.

[0039] Preferably, the methane gas analyzer also includes a temperature protection component, which includes a temperature sensor, a temperature protection switch, and a first alarm. The temperature sensor is used to sense the temperature of the gas chamber. The temperature protection switch includes a first voltage comparator and a first transistor switch. The first transistor switch is connected in series between the power supply and the first alarm. The output terminal of the temperature sensor is electrically connected to the non-inverting input terminal of the first voltage comparator. The inverting input terminal of the first voltage comparator receives a first reference voltage. The output terminal of the first voltage comparator is electrically connected to the base of the first transistor switch.

[0040] Specifically, when the temperature of the air chamber is too high, and the voltage output from the temperature sensor to the non-inverting input of the first voltage comparator is greater than the first reference voltage, the first voltage comparator outputs a high level to the base of the first transistor switch, causing the first transistor switch to be in the conducting state, and the first alarm is powered on to sound an alarm.

[0041] Preferably, the methane gas analyzer also includes a humidity protection component, which includes a humidity sensor, a humidity protection switch, and a second alarm. The humidity sensor is used to sense the humidity of the gas chamber. The humidity protection switch includes a second voltage comparator and a second transistor switch. The second transistor switch is connected in series between the power supply and the second alarm. The output terminal of the humidity sensor is electrically connected to the non-inverting input terminal of the second voltage comparator. The inverting input terminal of the second voltage comparator receives a second reference voltage. The output terminal of the second voltage comparator is electrically connected to the base of the second transistor switch.

[0042] Specifically, when the humidity in the air chamber is too high, and the voltage output from the humidity sensor to the non-inverting input of the second voltage comparator is greater than the second reference voltage, the second voltage comparator outputs a high level to the base of the second transistor switch, causing the second transistor switch to be in the conducting state, and the second alarm is powered on to sound an alarm.

[0043] Finally, it should be understood that the embodiments described in this specification are merely illustrative of the principles of the embodiments described herein. Other variations may also fall within the scope of this specification. Therefore, alternative configurations of the embodiments described herein are intended to be illustrative rather than limiting, and should be considered consistent with the teachings of this specification. Accordingly, the embodiments described herein are not limited to those explicitly introduced and described herein.

Claims

1. A station-mounted high-precision gas leak monitoring device, characterized in that, The system includes a sampling component and a natural gas leak monitoring component. The sampling component includes a housing and multiple sampling inlets on the housing. Each sampling inlet is connected to an inlet pipe, and a valve is installed on the inlet pipe. The housing also contains a sampling pump, and the housing has an outlet connected to a transmission pipe. The transmission pipe is electrically connected to the natural gas leak monitoring component, which is used to monitor the methane concentration of the air transmitted through the transmission pipe. The natural gas leak monitoring component includes at least a methane gas analyzer.

2. The station-mounted high-precision gas leak monitoring device according to claim 1, characterized in that, The valve is a two-position three-way solenoid valve. The air inlet port of the two-position three-way solenoid valve is connected to the air inlet pipe, and one air outlet port of the two-position three-way solenoid valve is connected to the sampling air inlet.

3. The station-mounted high-precision gas leak monitoring device according to claim 2, characterized in that, The sampling component also includes an interlock circuit, wherein the interlock circuit is used to control that only one of the two-position three-way solenoid valves is activated at any given time.

4. A station-mounted high-precision gas leak monitoring device according to any one of claims 1-3, characterized in that, The natural gas leak monitoring component also includes a display, a temperature and humidity monitoring device, and a wind direction and speed meter. The display is used to show the ambient temperature and humidity information collected by the temperature and humidity monitoring device, as well as the wind direction and speed information collected by the wind direction and speed meter.

5. A station-mounted high-precision gas leak monitoring device according to any one of claims 1-3, characterized in that, The sampling component also includes a positioning component for acquiring the position information of the sampling component.

6. A station-mounted high-precision gas leak monitoring device according to any one of claims 1-3, characterized in that, A filter is also installed inside the air intake pipe.

7. A station-mounted high-precision gas leak monitoring device according to any one of claims 1-3, characterized in that, The sampling component also includes a switching power supply for converting 220V AC power to 12V DC power.

8. A station-mounted high-precision gas leak monitoring device according to any one of claims 1-3, characterized in that, The methane gas analyzer includes a light source, an optical path assembly, a gas chamber, a detector, and an analyzer. The light source provides infrared radiation, the optical path assembly guides the infrared radiation through the gas chamber, the detector receives the light that changes after passing through the gas chamber and converts it into an electrical signal, and the analyzer calculates the concentration of methane gas based on the electrical signal.

9. A station-mounted high-precision gas leak monitoring device according to claim 8, characterized in that, The methane gas analyzer also includes a temperature protection component, which includes a temperature sensor, a temperature protection switch, and a first alarm. The temperature sensor is used to sense the temperature of the gas chamber. The temperature protection switch includes a first voltage comparator and a first transistor switch. The first transistor switch is connected in series between the power supply and the first alarm. The output terminal of the temperature sensor is electrically connected to the non-inverting input terminal of the first voltage comparator. The inverting input terminal of the first voltage comparator receives a first reference voltage. The output terminal of the first voltage comparator is electrically connected to the base of the first transistor switch.

10. A station-mounted high-precision gas leak monitoring device according to claim 8, characterized in that, The methane gas analyzer also includes a humidity protection component, which includes a humidity sensor, a humidity protection switch, and a second alarm. The humidity sensor is used to sense the humidity of the gas chamber. The humidity protection switch includes a second voltage comparator and a second transistor switch. The second transistor switch is connected in series between the power supply and the second alarm. The output terminal of the humidity sensor is electrically connected to the non-inverting input terminal of the second voltage comparator. The inverting input terminal of the second voltage comparator receives a second reference voltage. The output terminal of the second voltage comparator is electrically connected to the base of the second transistor switch.

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