Gas leak alarm device and detection method

Abstract

The present invention relates to the field of instrument technology. The present invention discloses a gas leak alarm device, which includes a detection module and a processing module; the detection module is used to detect the concentration of at least two characteristic gases in the environment, the characteristic gas includes a first characteristic gas, and the components of the gas include the first characteristic gas; the processing module causes the gas leak alarm device to alarm when the concentration of the first characteristic gas is higher than a preset concentration threshold; and the processing module also determines the source of the first characteristic gas based on the concentration of the remaining characteristic gases or the concentration ratio between the first characteristic gas and the remaining characteristic gases, and prompts the management personnel of the source of the first characteristic gas. The present invention also discloses a gas leak detection method. The gas leak alarm device in the present invention has a high sensitivity for leak judgment and good anti-interference ability, and can reduce the misjudgment of the gas leak alarm device.

Description

Technical Field

[0001] The present invention relates to the technical field of instruments, and in particular to a gas leakage alarm device and a detection method. Background Art

[0002] In the related art, to determine whether a pipeline is leaking, an alarm or detector is usually installed at a detection point to determine whether a leak has occurred by detecting the concentration of the gas (such as the concentration of CH4) in the environment.

[0003] However, this method is susceptible to environmental interference. For example, in scenarios such as biogas digesters and chemical plants, the alarm cannot distinguish the source of gas in the environment and is prone to false alarms. Summary of the invention

[0004] In order to solve the problem in the related art that the alarm is easily affected by environmental interference and generates false alarms, the present application provides a gas leak alarm device.

[0005] The present application provides a gas leak alarm device, which includes a detection module and a processing module; the detection module is used to detect the concentration of at least two characteristic gases in an environment, the characteristic gases include a first characteristic gas, and the components of the gas include the first characteristic gas; the processing module causes the gas leak alarm device to alarm when the concentration of the first characteristic gas is higher than a preset concentration threshold; and the processing module also determines the source of the first characteristic gas based on the concentration of the remaining characteristic gases or the concentration ratio between the first characteristic gas and the remaining characteristic gases, and prompts the management personnel of the source of the first characteristic gas.

[0006] Furthermore, the detection module is used to detect the concentrations of the first characteristic gas and the second characteristic gas, and the components of the fuel gas include the first characteristic gas and the second characteristic gas; the processing module is used to calculate the concentration ratio between the first characteristic gas and the second characteristic gas in the environment. If the concentration ratio is within a preset range, it is judged that the first characteristic gas comes from the pipeline; if the concentration ratio is outside the preset range, it is judged that the first characteristic gas comes from an interference source in the environment.

[0007] Furthermore, the detection module is used to detect the concentration of three characteristic gases in the environment. The components of the fuel gas include three characteristic gases. When the concentration ratio of any two characteristic gases is within the corresponding preset range, it is judged that the characteristic gas comes from the pipeline. If the concentration ratio is outside the preset range, it is judged that the characteristic gas comes from the interference source in the environment.

[0008] Furthermore, the characteristic gas includes a second characteristic gas, which is unique to the interference source. When the detection module detects the second characteristic gas, the processing module determines that the gas leak alarm device is affected by the interference source.

[0009] Furthermore, the processing module inverts and obtains a theoretical concentration value of the first characteristic gas in the environment based on the concentration ratio of the first characteristic gas to the second characteristic gas in the interference source and the concentration value of the second characteristic gas in the environment. The processing module compares the theoretical concentration value of the first characteristic gas with the actual concentration value of the first characteristic gas. If the theoretical concentration value is lower than the actual concentration value, it is determined that the first characteristic gas comes at least partially from the gas pipeline.

[0010] Furthermore, the characteristic gas includes a second characteristic gas, which is common in the interference source, fuel gas and the environment, the concentration of the second characteristic gas in the fuel gas is a first concentration, the concentration of the second characteristic gas in the interference source is a second concentration, the concentration of the second characteristic gas in the environment when not affected by the interference source and fuel gas is a third concentration, the second concentration is greater than the first concentration and the third concentration, and the difference between the second concentration and the first concentration is greater than the first threshold, and the difference between the second concentration and the third concentration is greater than the second threshold.

[0011] Furthermore, the detection module periodically detects the first characteristic gas in the environment. If the concentration of the first characteristic gas detected in the environment is higher than a preset concentration threshold for a consecutive preset number of times, the gas leak alarm device will sound an alarm.

[0012] Furthermore, the gas leak alarm device is communicatively connected to the remote monitoring platform. When the gas leak alarm device detects that the concentration of the first characteristic gas is higher than a preset concentration threshold and determines that the first characteristic gas comes from the pipeline, the gas leak alarm device sends an alarm message to the remote monitoring platform to trigger the remote monitoring platform to send a valve closing instruction to the gas meter in the pipeline.

[0013] The present application provides a gas leak detection method, which comprises the following steps:

[0014] detecting the concentration of at least two characteristic gases in the environment, the characteristic gases including a first characteristic gas, and the components of the fuel gas including the first characteristic gas;

[0015] When the concentration of the first characteristic gas is higher than a preset concentration threshold, an alarm is issued, and the source of the first characteristic gas is determined based on the concentration ratio between the first characteristic gas and the other characteristic gases, and the source of the first characteristic gas is prompted to the management personnel.

[0016] Furthermore, the concentrations of the first characteristic gas and the second characteristic gas are detected, and the components of the fuel gas include the first characteristic gas and the second characteristic gas; the concentration ratio between the first characteristic gas and the second characteristic gas in the environment is calculated, and if the concentration ratio is within a preset range, it is judged that the first characteristic gas comes from a pipeline; if the concentration ratio is outside the preset range, it is judged that the first characteristic gas comes from an interference source in the environment.

[0017] The present application provides a gas leak alarm device, which can detect multiple characteristic gases and determine the source of the characteristic gases, thereby improving the anti-interference ability and sensitivity of the gas leak alarm device and reducing the misjudgment of the gas leak alarm device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a gas leak alarm device in one embodiment of the present application;

[0019] Figure 2 This is a flow chart of the detection process of the gas leak alarm device in the first embodiment of the present application;

[0020] Figure 3 This is a flow chart of the detection process of the gas leak alarm device in the second embodiment of the present application;

[0021] Figure 4 This is a flow chart of the detection process of the gas leak alarm device in the third embodiment of the present application;

[0022] Figure 5 This is a flow chart of the detection process of the gas leak alarm device in the fourth embodiment of the present application;

[0023] Figure 6 This is a flow chart of the detection process of the gas leak alarm device in the fifth embodiment of the present application.

[0024] In the figure: a gas leakage alarm device 100, a detection module 11, and a processing module 12. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the specific implementation modes of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the implementation modes of the present invention.

[0026] The present application embodiment provides a Figure 1The gas leak alarm device 100 shown in the figure includes a detection module 11 and a processing module 12. The detection module 11 is used to detect the concentration of at least two characteristic gases in the environment, the characteristic gases include a first characteristic gas, and the components of the gas include the first characteristic gas. The processing module 12 can make the gas leak alarm device 100 alarm when the concentration of the first characteristic gas is higher than the preset concentration threshold. In addition, the processing module 12 also determines the source of the first characteristic gas according to the concentration of the remaining characteristic gases or the concentration ratio between the first characteristic gas and the remaining characteristic gases, and prompts the management personnel of the source of the first characteristic gas. The processing module 12 can determine the source of the first characteristic gas according to the concentration of the remaining characteristic gases or the concentration ratio between the first characteristic gas and the remaining characteristic gases. When the concentration of the first characteristic gas is higher than the preset concentration threshold, the gas leak alarm device 100 alarms and displays the source of the first characteristic gas to the management personnel, and the management personnel can close the valve or ventilate according to whether the first characteristic gas comes from the pipeline. When the first characteristic gas is not detected, the gas leak alarm device 100 does not alarm. When the first characteristic gas is detected, but the concentration of the first characteristic gas is lower than the preset concentration threshold, the processing module will determine the source of the first characteristic gas. If it is determined that the first characteristic gas comes from the pipeline, it is considered that there is a slight leak in the pipeline and an alarm is issued. If it is determined that the first characteristic gas comes from the external environment, no alarm is issued. In the embodiment of the present application, the gas source is determined by identifying the gas components, thereby determining whether the pipeline is leaking, improving the anti-interference ability and sensitivity of the gas leak alarm device 100, and reducing the misjudgment of the gas leak alarm device 100.

[0027] As an optional implementation, Figure 2As shown, the detection module 11 is used to detect the concentration of the first characteristic gas and the second characteristic gas, and the components of the gas include the first characteristic gas and the second characteristic gas. When the components of the gas and the interference gas are similar, two gases with a large difference in the concentration ratio of the components in the gas and the interference gas can be used as the first characteristic gas and the second characteristic gas. Using two gases with a large difference in the concentration ratio of the components in the gas and the interference gas as characteristic gases can improve the accuracy of the judgment of the gas leak alarm device 100. The preset range is set according to the concentration ratio of the first characteristic gas and the second characteristic gas in the gas. The processing module 12 is used to calculate the concentration ratio between the first characteristic gas and the second characteristic gas in the environment. If the concentration ratio is within the preset range, it is judged that the first characteristic gas comes from the pipeline and an alarm is issued. If the concentration ratio is outside the preset range, it is judged that the first characteristic gas comes from the interference source in the environment, and no alarm is issued. The gas has uniformity and stability, and the concentration ratio of each component in the gas will not change much. When leaking, the gas diffuses into the air. Although the concentration of each component will decrease, the ratio between different components will not change much. Therefore, the source of the gas can be determined by calculating the ratio between the two characteristic gases. Through the concentration ratio of the first characteristic gas and the second characteristic gas, the gas leak alarm device 100 can distinguish between two gas sources with similar components, improve the anti-interference ability and sensitivity of the gas leak alarm device 100, and reduce the misjudgment of the gas leak alarm device 100. For example, in a specific embodiment 1, the gas leak alarm device 100 is used to detect whether a pipeline is leaking, and there is an interference source near the pipeline. The gas components in the pipeline are shown in Table 1, and the gas components in the interference source are shown in Table 2.

[0028] Table 1: Gas components in pipelines

[0029] Components <![CDATA[N2]]> <![CDATA[CH4]]> <![CDATA[CO2]]> <![CDATA[C2H6]]> <![CDATA[C3H8]]> other concentration(%) 0.9 95.1 0.8 2.7 0.3 0.2

[0030] Table 2: Gas components in interference sources

[0031] Components <![CDATA[N2]]> <![CDATA[CH4]]> <![CDATA[CO2]]> <![CDATA[C2H6]]> <![CDATA[C3H8]]> other concentration(%) 0.8 96.3 0.2 1.6 0.8 0.3

[0032] The gas in the pipeline and the gas in the interference source in Example 1 are analyzed. The gas components in the pipeline gas and the interference source are similar, the ratio of the concentration of C2H6 to the concentration of C3H8 is 9, and the ratio of the concentration of C2H6 to the concentration of C3H8 in the interference source gas is 2. The ratio of the concentration of C2H6 to C3H8 in the pipeline gas is 4.5 times the ratio of the concentration of C2H6 to C3H8 in the interference source. Therefore, C2H6 can be selected as the first characteristic gas and C3H8 as the second characteristic gas, and the source of the first characteristic gas and the second characteristic gas can be accurately determined based on the comparison of the concentrations of C2H6 and C3H8. According to the ratio of the concentrations of C2H6 and C3H8 in the pipeline gas, the preset range is set to 6.3 to 11.7.

[0033] When the first characteristic gas C2H6 is not detected, no alarm is given. When the concentration of C2H6 is greater than the preset threshold, an alarm is given and the source of the gas is determined. When C2H6 is detected but the concentration is less than the preset threshold, the source of the gas is determined. If the gas comes from the pipeline, an alarm is given. If the gas comes from the interference source, no alarm is given.

[0034] The judgment basis is that the processing module 12 calculates the ratio of the concentration of C2H6 to C3H8. When the ratio is outside the preset range (6.3-11.7), it is judged that the gas comes from the interference source. When the ratio is within the preset range (6.3-11.7), it is judged that the gas comes from the pipeline.

[0035] As another optional implementation, the detection module 11 is used to detect three characteristic gases in the environment. For example, in Example 1, CH4 has a larger proportion in the gas, so it is more accurate to judge whether a leak occurs based on the concentration of CH4. The detection module 11 can detect the concentrations of CH4, C2H6, and C3H8, and the processing module 12 judges whether a leak occurs based on the concentration of CH4, and judges the source of the gas based on the concentrations of C2H6 and C3H8.

[0036] As another optional implementation, Figure 3 As shown, the detection module 11 is used to detect the concentration of three characteristic gases in the environment. The components of the fuel gas include three characteristic gases. The gas with a large difference in component concentration between the fuel gas and the interfering gas is preferably selected as the characteristic gas. When the concentration ratio of any two characteristic gases is within the corresponding preset range, it is judged that the characteristic gas comes from the pipeline, otherwise it is judged that the characteristic gas comes from the interference source in the environment. For example, three characteristic gases are selected, and the concentrations of the three characteristic gases detected are represented by A, B, and C respectively. The A:B and A:C values ​​in the gas are obtained. When the values ​​of both are within the preset range, it is judged that the gas source comes from the pipeline and the pipeline leaks, otherwise it is considered to be the interference source gas. By judging whether the gas comes from the pipeline by the three characteristic gases, the anti-interference ability of the gas leak alarm device 100 is stronger, the judgment is more accurate, and the misjudgment of the gas leak alarm device 100 is reduced. By selecting more characteristic gases for detection, calculation and analysis, the accuracy of the judgment of the gas leak alarm device 100 can be further improved. When used, the number of characteristic gases can be selected according to actual needs.

[0037] As another optional implementation, Figure 4As shown, the characteristic gas includes a second characteristic gas. The second characteristic gas is unique to the interference source, and the second characteristic gas is not contained in the pipeline and the air. When the detection module 11 detects the second characteristic gas, the processing module 12 determines that the gas leak alarm device 100 is affected by the interference source. By detecting the second characteristic gas unique to the interference source, it is possible to simply and efficiently determine whether the gas leak alarm device 100 is affected by the interference source. For example, in a specific embodiment 2, the gas leak alarm device 100 is used to detect whether a pipeline is leaking, and there is a biogas digester near the pipeline. The gas components in the pipeline are shown in Table 3, and the gas components in the biogas digester are shown in Table 4.

[0038] Table 3: Gas components in pipelines

[0039] Components <![CDATA[N2]]> <![CDATA[CH4]]> <![CDATA[CO2]]> <![CDATA[C2H6]]> <![CDATA[C3H8]]> other concentration(%) 0.9 95.1 0.8 2.7 0.3 0.2

[0040] Table 4: Gas components in biogas digesters

[0041] Components <![CDATA[N2]]> <![CDATA[CH4]]> <![CDATA[CO2]]> <![CDATA[O2]]> <![CDATA[H2S]]> other concentration(%) 3.1 71.1 25.1 0.2 0.4 0.1

[0042] H2S is a unique gas in the biogas digester. CH4 is selected as the first characteristic gas and H2S as the second characteristic gas. When the first characteristic gas CH4 is not detected, no alarm is issued. When the concentration of CH4 is greater than the preset threshold, an alarm is issued and it is determined whether the gas is affected by the biogas digester. When CH4 is detected but the concentration is less than the preset threshold, it is determined whether the gas is affected by the gas in the biogas digester. If the gas is not affected by the biogas digester, an alarm is issued. If the gas is affected by the biogas digester, no alarm is issued.

[0043] The judgment basis is that if H2S is detected, the gas is judged to be affected by the biogas digester. If H2S is not detected, the gas is judged to be not affected by the biogas digester and comes from the pipeline.

[0044] As an optional implementation, Figure 5As shown, when the second characteristic gas is a unique gas in the interference source, the processing module 12 inverts the theoretical concentration value of the first characteristic gas if all the gases in the environment come from the interference source based on the concentration ratio of the first characteristic gas to the second characteristic gas in the interference source and the concentration value of the second characteristic gas in the environment detected by the detection module 11. The processing module 12 compares the theoretical concentration value of the first characteristic gas with the actual concentration value of the first characteristic gas detected by the detection module 11. If the theoretical concentration value is lower than the actual concentration value, it is determined that the first characteristic gas is at least partially from the gas pipeline, and an alarm is issued. For example, in Example 2, after determining that the gas is affected by the biogas digester, it is further determined whether the first characteristic gas CH4 is entirely from the biogas digester based on the concentration ratio of CH4 to H2S in the biogas digester. The gas has uniformity and stability, and the concentration ratio of each component in the gas will not change much. When leaking, the gas diffuses into the air. Although the concentration of each component will decrease, the ratio between different components will not change much. Therefore, the ratio between the two characteristic gases can be calculated, and the theoretical value of the CH4 concentration in the environment can be inverted according to the H2S concentration detected by the detection module 11, and compared with the actual detected CH4 concentration. If the theoretical concentration value is lower than the actual CH4 concentration value, it is judged that at least part of the CH4 comes from the gas pipeline, and an alarm is still issued. Otherwise, no alarm is issued.

[0045] As an optional implementation, Figure 6 As shown, the characteristic gas includes a second characteristic gas, the second characteristic gas is common to the interference source, the fuel gas and the environment, the concentration of the second characteristic gas in the fuel gas is the first concentration, the concentration of the second characteristic gas in the interference source is the second concentration, and the concentration of the second characteristic gas in the environment without being affected by the interference source and the fuel gas is the third concentration. The second concentration is greater than the first concentration and the third concentration, and the difference between the second concentration and the first concentration is greater than the first threshold, and the difference between the second concentration and the third concentration is greater than the second threshold.

[0046] The concentration of the second characteristic gas in the interference source is much greater than the concentration of the second characteristic gas in the gas and in the air. The preset concentration value can be set according to the first concentration, the second concentration and the third concentration. When the concentration of the second characteristic gas detected by the detection module 11 is less than the preset concentration value, it is judged that the characteristic gas is not affected by the interference source; when the concentration of the second characteristic gas detected by the detection module 11 is greater than the preset concentration value, it is judged that the gas leak alarm device 100 is affected by the interference source. By detecting the second characteristic gas whose concentration in the interference source is greatly different from that in the gas and in the air, it is possible to simply and efficiently judge whether the gas leak alarm device 100 is affected by the interference source. For example, in a specific embodiment 3, the gas leak alarm device 100 is used to detect whether a pipeline is leaking, and there is a biogas tank near the pipeline. The gas components in the pipeline are shown in Table 5, the gas components in the biogas tank are shown in Table 6, and the air components are shown in Table 7.

[0047] Table 5: Gas components in pipelines

[0048] Components <![CDATA[N2]]> <![CDATA[CH4]]> <![CDATA[CO2]]> <![CDATA[C2H6]]> <![CDATA[C3H8]]> other concentration(%) 0.9 95.1 0.8 2.7 0.3 0.2

[0049] Table 6: Gas components in biogas digesters

[0050] Components <![CDATA[N2]]> <![CDATA[CH4]]> <![CDATA[CO2]]> <![CDATA[O2]]> <![CDATA[H2S]]> other concentration(%) 3.1 71.1 25.1 0.2 0.4 0.1

[0051] Table 7: Gas components in air

[0052] Components <![CDATA[N2]]> <![CDATA[CH4]]> <![CDATA[CO2]]> <![CDATA[O2]]> <![CDATA[H2S]]> other concentration(%) 78.0 0 0.03 21 0 0.97

[0053] CO2 is contained in pipeline gas, gas in biogas digesters and air. The concentration of CO2 in biogas digesters is 25%, the concentration of CO2 in air is 0.03%, and the concentration of CO2 in pipeline gas is 0.8%. The concentration of CO2 in biogas digesters is much greater than that in air and pipeline gas. Therefore, CH4 can be selected as the first characteristic gas, CO2 as the second characteristic gas, and the preset concentration of CO2 is set to 2%.

[0054] When the first characteristic gas CH4 is not detected, no alarm is given. When the concentration of CH4 is greater than the preset threshold, an alarm is given and it is determined whether the gas is affected by the biogas digester. When CH4 is detected but the concentration is less than the preset threshold, it is determined whether the gas is affected by the biogas digester. If the gas is not affected by the biogas digester, an alarm is given; if the gas is affected by the biogas digester, no alarm is given.

[0055] The judgment basis is that if the detected CO2 concentration is greater than 2%, it is judged that the gas leak alarm device 100 is affected by the interference source. Otherwise, it is not affected by the methane tank and an alarm is issued. The concentration of CO2 in the pipeline and the air is low, so the detected CO2 concentration is low without external interference.

[0056] As another optional implementation, the detection module 11 periodically detects the first characteristic gas in the environment, and if the concentration of the first characteristic gas detected for a preset number of consecutive times is higher than a preset concentration threshold, the gas leak alarm device 100 will sound an alarm. By making judgments for multiple consecutive times, the accuracy of the judgment of the gas leak alarm device 100 is improved, and the misjudgment of the gas leak alarm device 100 is reduced.

[0057] As another optional implementation, the gas leak alarm device 100 is connected to the remote monitoring platform for communication. When the gas leak alarm device 100 detects that the concentration of the first characteristic gas is higher than the preset concentration threshold, and determines that the first characteristic gas comes from the pipeline, the gas leak alarm device 100 sends an alarm message to the remote monitoring platform to trigger the remote monitoring platform to send a valve closing instruction to the gas meter in the pipeline. By connecting the gas leak alarm device 100 to the remote monitoring platform for communication, the management personnel can timely understand the status of the pipeline, which is convenient for the management personnel to control the pipeline.

[0058] As another optional implementation, the processing module 12 can have various processing methods when it alarms, including LCD display alarm or sound and light alarm. The communication connection methods between the gas leak alarm device 100 and the remote monitoring platform can also be diversified, including GPRS, NB, 5G, etc. The on-site equipment of the gas leak alarm device 100 can also interact in a variety of ways, including outputting digital signals or directly controlling valves, etc.

[0059] The present invention also provides a method for detecting a gas leak, which comprises the following steps:

[0060] detecting the concentration of at least two characteristic gases in the environment, the characteristic gases including a first characteristic gas, and the components of the fuel gas including the first characteristic gas;

[0061] When the concentration of the first characteristic gas is higher than a preset concentration threshold, an alarm is issued, and the source of the first characteristic gas is determined based on the concentration ratio between the first characteristic gas and the other characteristic gases, and the source of the first characteristic gas is prompted to the management personnel.

[0062] As another optional implementation, the concentration of the first characteristic gas and the second characteristic gas is detected, and the components of the fuel gas include the first characteristic gas and the second characteristic gas. Using two gases with a large difference in component concentration ratio between the fuel gas and the interfering gas as the first characteristic gas and the second characteristic gas, and using two gases with a large difference in component concentration ratio between the fuel gas and the interfering gas as characteristic gases can improve the accuracy of the judgment of the gas leak alarm device 100. Set a preset range according to the concentration ratio of the first characteristic gas and the second characteristic gas in the fuel gas. Calculate the concentration ratio between the first characteristic gas and the second characteristic gas in the environment. If the concentration ratio is within the preset range, it is judged that the first characteristic gas comes from the pipeline. If the concentration ratio is outside the preset range, it is judged that the first characteristic gas comes from the interference source in the environment.

[0063] As another optional implementation, a second characteristic gas is detected. The second characteristic gas is unique to the interference source. When the second characteristic gas is detected, it is determined that the gas leak alarm device 100 is affected by the interference source.

[0064] As another optional implementation, the second characteristic gas is detected, and the concentration of the second characteristic gas in the interference source is much greater than the concentration in the gas and in the air. A preset concentration is set according to the concentration difference between the second characteristic gas in the interference source and in the gas and in the air. When the concentration of the second characteristic gas detected is less than the preset concentration value, it is determined that the characteristic gas is not affected by the interference source. When the concentration of the second characteristic gas detected is greater than the preset concentration value, it is determined that the gas leak alarm device 100 is affected by the interference source.

[0065] In summary, the gas leak alarm device 100 in the present application determines whether a leak occurs by detecting the concentration of gas in the environment. The gas leak alarm device 100 detects at least two characteristic gases, and can determine whether the detection is affected by an interfering gas source based on the detected gas, thereby improving the anti-interference ability and leakage judgment sensitivity of the gas leak alarm device 100 and reducing misjudgments of the gas leak alarm device 100.

[0066] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A gas leak alarm device, characterized in that: The device comprises: A detection module, the detection module is used to detect the concentration of at least two characteristic gases in the environment, the characteristic gases include a first characteristic gas, and the components of the fuel gas include the first characteristic gas; The processing module is configured to cause the gas leakage alarm device to sound an alarm when the concentration of the first characteristic gas is higher than a preset concentration threshold; Furthermore, the processing module further determines the source of the first characteristic gas according to the concentration of other characteristic gases or the concentration ratio between the first characteristic gas and other characteristic gases, and prompts the management personnel of the source of the first characteristic gas.

2. The gas leak alarm device according to claim 1, characterized in that: The detection module is used to detect the concentration of a first characteristic gas and a second characteristic gas, and the components of the fuel gas include the first characteristic gas and the second characteristic gas; The processing module is used to calculate the concentration ratio between the first characteristic gas and the second characteristic gas in the environment. If the concentration ratio is within a preset range, it is judged that the first characteristic gas comes from a pipeline; if the concentration ratio is outside the preset range, it is judged that the first characteristic gas comes from an interference source in the environment.

3. The gas leak alarm device according to claim 1, characterized in that: The detection module is used to detect the concentration of three characteristic gases in the environment. The components of the fuel gas include the three characteristic gases. When the concentration ratio of any two characteristic gases is within the corresponding preset range, it is judged that the characteristic gases come from the pipeline. If the concentration ratio is outside the preset range, it is judged that the characteristic gases come from the interference source in the environment.

4. The gas leak alarm device according to claim 1, characterized in that: The characteristic gas includes a second characteristic gas, which is unique to the interference source. When the detection module detects the second characteristic gas, the processing module determines that the gas leak alarm device is affected by the interference source.

5. The gas leak alarm device according to claim 4, characterized in that: The processing module inverts and obtains a theoretical concentration value of the first characteristic gas in the environment based on the concentration ratio of the first characteristic gas to the second characteristic gas in the interference source and the concentration value of the second characteristic gas in the environment. The processing module compares the theoretical concentration value of the first characteristic gas with the actual concentration value of the first characteristic gas. If the theoretical concentration value is lower than the actual concentration value, it is determined that the first characteristic gas is at least partially from the gas pipeline.

6. The gas leak alarm device according to claim 1, characterized in that: The characteristic gas includes a second characteristic gas, which is common in the interference source, the fuel gas and the environment. The concentration of the second characteristic gas in the fuel gas is a first concentration, the concentration of the second characteristic gas in the interference source is a second concentration, and the concentration of the second characteristic gas in the environment when not affected by the interference source and the fuel gas is a third concentration. The second concentration is greater than the first concentration and the third concentration, and the difference between the second concentration and the first concentration is greater than a first threshold, and the difference between the second concentration and the third concentration is greater than a second threshold.

7. The gas leak alarm device according to claim 1, characterized in that: The detection module periodically detects the first characteristic gas in the environment. If the concentration of the first characteristic gas is detected to be higher than a preset concentration threshold for a preset number of consecutive times, the gas leak alarm device will sound an alarm.

8. The gas leak alarm device according to claim 1, characterized in that: The gas leak alarm device is communicatively connected to the remote monitoring platform. When the gas leak alarm device detects that the concentration of the first characteristic gas is higher than a preset concentration threshold and determines that the first characteristic gas comes from a pipeline, the gas leak alarm device sends an alarm message to the remote monitoring platform to trigger the remote monitoring platform to send a valve closing instruction to the gas meter in the pipeline.

9. A gas leak detection method, characterized in that: The method comprises the following steps: detecting the concentration of at least two characteristic gases in the environment, wherein the characteristic gases include a first characteristic gas, and the components of the fuel gas include the first characteristic gas; When the concentration of the first characteristic gas is higher than a preset concentration threshold, an alarm is issued, and the source of the first characteristic gas is determined based on the concentration ratio between the first characteristic gas and the other characteristic gases, and the source of the first characteristic gas is prompted to the management personnel.

10. The gas leak detection method according to claim 9, characterized in that: The method comprises: Detecting the concentration of a first characteristic gas and a second characteristic gas, wherein the components of the fuel gas include the first characteristic gas and the second characteristic gas; The concentration ratio between the first characteristic gas and the second characteristic gas in the environment is calculated. If the concentration ratio is within a preset range, it is determined that the first characteristic gas comes from a pipeline. If the concentration ratio is outside the preset range, it is determined that the first characteristic gas comes from an interference source in the environment.

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