A gas identification system and method based on differential sampling

Abstract

The application relates to a differential acquisition-based gas identification system and method, which aims at the defect that the existing point detection method cannot effectively detect the diffusion of gas. The system comprises a guide module capable of identifying the gas in a specified area, the guide module comprises two guide units with different axial sizes, and the guide units are provided with identification modules capable of identifying the gas flowing in the inner cavities of the guide units in a directional manner, so that the identification modules in different guide units identify the gas in the specified area multiple times in a time interval, wherein the different identification modules complete the multiple identification of the same gas on the diffusion path in a manner that the identification modules respond to the identification in an interval according to the different distances between the guide units corresponding to the identification modules and the gas source diffusing in the specified area.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas identification, and in particular to a gas identification system and method based on differential acquisition. BACKGROUND

[0002] In recent years, production accidents caused by gas leakage have occurred frequently, which has sounded the alarm for safety for managers and workers, and has also put forward great demand for gas safety monitoring. With the rapid development of industrialization, enterprises pay more and more attention to the safety of workers and equipment, environmental protection and sustainability. In the production operation involving harmful gases, it is of great significance to ensure public safety and property to timely detect and monitor the leakage and concentration distribution of harmful gases. With the rapid development of sensor technology, sensor technology has quickly penetrated into the field of gas monitoring. Compared with traditional monitoring methods, gas detection sensors have the advantages of small size, simple system structure, low equipment cost and high precision (which can reach ppm level), in addition, gas detection sensors can be used for real-time point monitoring of whether there is leakage of gas, thereby ensuring the safety of detection workers and the normal operation of equipment.

[0003] The patent document with the patent number CN112730519A discloses a portable methane trace leakage quantification detector and a detection method thereof. The detection instrument includes a gas collection and flow device, a methane concentration detection device and an air flow detection device, and the methane concentration detection device and the air flow detection device are arranged on the gas collection and flow device. The gas collection and flow device includes a detection site sealing bag, an air inlet hose, a straight flow pipe fan and an air outlet connected in sequence, and the detection site sealing bag is wrapped around the pipe test point.

[0004] The patent document with the publication number CN104101686B discloses a gas monitoring method, which includes the following steps: (A1) counting the wind direction and wind speed in the region to obtain the dominant wind direction, non-dominant wind direction and average wind speed in the region; (A2) taking the intersection point of the dominant wind direction of the gas leakage source and the region boundary as the center of the gas sensor, using fluid software simulation to continuously increase the leakage rate of the gas under the dominant wind direction and average wind speed, when the gas concentration of the center point reaches the upper limit of the detection of the gas sensor, the position where the concentration on the region boundary is the lower limit of the detection of the gas sensor is the boundary point; (A3) optimizing the position of the gas sensor; (A4) monitoring the leaked gas in the region by using the gas sensor at the position of the point.

[0005] Traditional sensors are point measurement, which can only determine whether gas exists, and cannot monitor gas diffusion. It is easy to be affected by the external environment, and it is difficult to find the gas leakage point. In practical application, it is only suitable for early warning of fixed equipment, and it is difficult to troubleshoot faults, and even may delay the positioning of fault points. In addition, although the point detection method can effectively classify gas, and it has the advantages of fast speed, high precision, low cost and easy operation, but the method has the disadvantage that it can only detect whether gas exists, and cannot image gas diffusion distribution. In the pipeline leakage scene, it cannot timely and accurately locate the leakage point, and the method is easy to be affected by external factors. Although the surface imaging can well solve the above problems, the high price and high process level limit the applicability of the surface imaging device. Therefore, a gas identification system with low cost and capable of accurately detecting gas leakage is needed to help staff detect in-pipe gas leakage and locate the leakage point, so as to protect the personal safety of the staff and the normal operation of the production equipment.

[0006] In addition, on the one hand, due to the difference in understanding of those skilled in the art; on the other hand, because the inventors have studied a large number of literatures and patents when making the invention, but limited by the length and did not detail all the details and contents, but this is by no means that the present invention does not have the characteristics of these prior arts, on the contrary, the present invention has all the characteristics of the prior art, and the applicant reserves the right to add relevant prior art in the background art. SUMMARY

[0007] In view of the deficiencies of the prior art, the technical scheme of the present application provides a gas identification system and method based on differential collection, which at least comprises a guiding module capable of identifying the gas in a specified area, the guiding module comprises two flow guiding units with different axial dimensions, and an identification module capable of identifying the gas flowing in a directional manner in the inner chamber of the flow guiding unit is arranged in the two flow guiding units, so that the identification modules in different flow guiding units identify the gas in the specified area multiple times in a time interval, wherein the different identification modules complete the multiple identifications of the same gas on the diffusion path in a manner that they respond to the identification in an interval according to the different distances between the flow guiding units corresponding to them and the gas source diffusing in the specified area, and the identification modules transmit the identification results and response times obtained by them to an analysis module for comparison and analysis; the analysis module analyzes the diffusion distribution trend of the gas and the concentration of the specific component contained in the gas according to the identification results and response times of the identification modules. The advantage is that by arranging the flow guiding units and identification modules capable of obtaining differential identification results, the defect that the point-type gas identification system cannot obtain the diffusion condition of the gas is eliminated, the diffusion speed of the gas is calculated by using the two sets of gas component information with a time difference, and the gas distribution condition when the gas diffuses and the gradual dilution condition of the gas in the environment are analyzed according to the concentration difference of the specific component in the gas detected by the two identification modules, so as to trace back the leakage source in a reverse direction according to the directional dilution condition. The system can also correct the actual diffusion condition of the gas in combination with the detected airflow condition, so as to avoid errors in the detection results.

[0008] According to a preferred embodiment, the flow guiding unit comprises a first air guiding pipe and a second air guiding pipe with different lengths, wherein the first air guiding pipe and the second air guiding pipe are arranged in parallel, the air outlet ports of the first air guiding pipe and the second air guiding pipe are flush, and the axial extension length of the first air guiding pipe is longer than that of the second air guiding pipe. The advantage is that by arranging air guiding pipes with different lengths, the gas captured by the air guiding pipes is in a sequence, so as to calculate the diffusion speed of the gas by using the length difference and capture time difference of the two air guiding pipes.

[0009] According to a preferred embodiment, when the gas in the specified area diffuses, at least part of the gas enters the first air guiding pipe and is identified by the identification module, the gas that does not enter the first air guiding pipe can further diffuse in the diffusion direction, so that after the first air guiding pipe captures the gas for an interval of time, at least part of the continuously diffusing gas enters the second air guiding pipe, so that the first air guiding pipe and the second air guiding pipe capture the gas diffusing in the specified area in a time interval.

[0010] According to a preferred embodiment, the identification modules installed in the first and second air guide pipes respectively are capable of marking the time points of making gas response while making the gas response, so as to facilitate the analysis module to calculate the diffusion speed of the gas according to the time difference between the time points of making gas response by the different identification modules and the length difference of the first and second air guide pipes.

[0011] According to a preferred embodiment, the guide module further comprises a gas gathering unit arranged at the air inlet end of the flow guide unit, the gas gathering unit is arranged in a manner of guiding the directional flow of the gas in a certain fan range into the guide module, and the gas gathering units arranged at the air inlet ends of the first and second air guide pipes do not overlap with each other in the axial projection plane.

[0012] According to a preferred embodiment, the pipe body ends of the first and second air guide pipes are selectively installed with a driving unit capable of guiding the directional flow of the gas, and the driving unit is capable of adjusting its working state under the control of the analysis module, so that the analysis module can analyze the working state of the identification module by using the changed gas flow rate in the pipe body.

[0013] According to a preferred embodiment, the identification module comprises a first identification unit arranged in the first air guide pipe and a second identification unit arranged in the second air guide pipe, the first and second identification units make identification response when detecting that the gas contains a specific component, and mark the response time points synchronously, so as to calculate the diffusion speed of the gas when diffusing a specified distance by using the time difference of making identification response by the first and second identification units.

[0014] According to a preferred embodiment, the guide module further comprises a rotating support for adjusting the flow direction of the flow guide unit according to the diffusion speed and distribution of the gas analyzed by the analysis module, the rotating support is capable of controlling the rotation of the flow guide unit, so that the axial direction of the flow guide unit can overlap with one diffusion direction of the gas.

[0015] The technical scheme of the present application further provides a gas identification method based on differential acquisition, which comprises:

[0016] Two flow guide units with different axial sizes and parallel to each other are arranged;

[0017] Identification modules capable of identifying the directional flow of the gas in the inner cavities of the flow guide units are arranged in the two flow guide units, so that the identification modules in different flow guide units identify the gas in the specified area for multiple times with time intervals.

[0018] The recognition module transmits the recognition result and response time obtained by it to the analysis module for comparison and analysis.

[0019] The analysis module analyzes the diffusion distribution trend of the gas and the concentration of the specific component contained in the gas according to the recognition result and response time of the recognition module.

[0020] According to a preferred embodiment, different recognition modules complete multiple recognitions of the same gas on the diffusion path in a manner of making recognition responses at intervals according to different distances between the gas source occurring diffusion in the designated area and the corresponding guiding unit. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a preferred structure diagram of a gas recognition system based on differential collection according to the present application;

[0022] Figure 2 is an end surface diagram of a guiding module of a preferred gas recognition system based on differential collection according to the present application;

[0023] Figure 3 is a structure diagram of a filtering module of a preferred gas recognition system based on differential collection according to the present application.

[0024] LIST OF REFERENCE NUMBERS

[0025] 1: guiding module; 2: recognition module; 3: analysis module; 4: filtering module; 11: guiding unit; 12: gas gathering unit; 13: driving unit; 14: rotating support; 111: first gas guide pipe; 112: second gas guide pipe; 21: first recognition unit; 22: second recognition unit; 41: shell; 42: filtering pipeline; 43: adsorption unit. DETAILED DESCRIPTION

[0026] The following will be described in detail with reference to the accompanying drawings.

[0027] Example 1

[0028] The present application provides a gas recognition system based on differential collection, which comprises a guiding module 1, a recognition module 2, an analysis module 3 and a filtering module 4.

[0029] According to Figure 1In a specific embodiment shown, the guiding module 1 can guide the gas in the specified area to enter the inner chamber in a diffused manner, so that the two identification modules 2 arranged in the inner chamber of the guiding module 1 can respectively respond to the identification of the gas. The two identification modules 2 are arranged in the inner chamber of the guiding module 1 in a relative position difference, so that the gas entering the inner chamber can be identified by the two identification modules 2 in a time interval, so that the two identification modules 2 can realize differential gas identification. The identification module 2 is also signal connected with the analysis module 3, so as to transmit the identification result and the marked response time point data obtained by the identification module 2 to the analysis module 3. The analysis module 3 analyzes the diffusion distribution trend of the gas and the concentration of the specific component contained in the gas according to the identification result and the response time point data of the identification module 2. The analysis module 3 can also analyze the size of the included angle between the guiding module 1 and the diffusion direction of the gas according to the analysis result and the actual monitored gas flow direction, so as to control the direction adjustment of the guiding module 1 according to the further analysis result, so that the axial direction of the guiding module 1 can coincide with the diffusion direction of the gas, so that the identification module 2 can more accurately identify the gas diffusion situation. The inner chamber of the guiding module 1 is also provided with a filtering module 4. The filtering module 4 can filter the interference components that may be contained in the gas entering the inner chamber of the guiding module 1, avoid the interference of the interference components on the identification of the specific component by the identification module 2, and make the identification result more accurate.

[0030] Preferably, the guiding module 1 includes a flow guiding unit 11, a gas gathering unit 12, a driving unit 13, and a rotating support 14. The gas inlet end of the flow guiding unit 11 is provided with the gas gathering unit 12 which can guide the gas in the fan area to better enter the inner chamber thereof. The gas outlet end of the flow guiding unit 11 is provided with the driving unit 13 which can guide the gas entering the flow guiding unit 11 to flow at a faster rate, so that the identification module 2 can more effectively identify the specific component that may be contained in the gas, avoid the accumulation of the gas in the inner chamber of the flow guiding unit 11, and change the concentration of the gas and the specific component. Preferably, the outside of the flow guiding unit 11 is also provided with the rotating support 14, so that the flow guiding unit 11 can rotate relative to the rotating support 14, thereby changing the direction of the axis of the flow guiding unit 11 in the world coordinate system, so that the axial direction of the flow guiding unit 11 can coincide with the diffusion direction of the gas, so that the diffusion speed detected by the system is accurate.

[0031] Preferably, the flow guide unit 11 comprises a first air guide pipe 111 and a second air guide pipe 112 with different lengths. Further preferably, the first air guide pipe 111 and the second air guide pipe 112 are arranged in parallel, and the air outlet ports of the first air guide pipe 111 and the second air guide pipe 112 are flush, and the axial extension length of the first air guide pipe 111 is longer than that of the second air guide pipe 112. That is, the length of the first air guide pipe 111 is longer than that of the second air guide pipe 112, and when the air outlet ends of the two are flush, the air inlet initial end of the first air guide pipe 111 extends a distance greater than that of the air inlet initial end of the second air guide pipe 112. Specifically, when gas leakage occurs in the pipeline in the specified area, at least part of the gas first enters the first air guide pipe 111 and is identified by the identification module 2 arranged in the first air guide pipe 111, and the identification module 2 marks the time point when it starts to work effectively in response to the identification, so as to take the time point as the time point when the first air guide pipe 111 effectively captures the gas containing the specific component. Then, the gas that does not enter the first air guide pipe 111 can continue to diffuse along the original diffusion direction, so that after an interval time of capturing the gas by the first air guide pipe 111, the remaining free diffusion gas contacts the second air guide pipe 112, so that the first air guide pipe 111 and the second air guide pipe 112 capture the gas diffusing in the specified area in a time interval. Preferably, the identification modules 2 respectively arranged in the first air guide pipe 111 and the second air guide pipe 112 can mark the response time points when they respond to the gas, so as to facilitate the analysis module 3 to calculate the diffusion speed of the gas according to the time difference between the time points when the different identification modules 2 respond to the gas and the length difference between the first air guide pipe 111 and the second air guide pipe 112. Preferably, the interval time is defined as the time difference between the time points when the first air guide pipe 111 and the second air guide pipe 112 belonging to the same flow guide unit 11 capture the gas, and is used to represent the diffusion time of the gas from the port of the first air guide pipe 111 to the port of the second air guide pipe 112. That is, when the gas diffuses to the position where the flow guide unit 11 is located, the gas first contacts the first air guide pipe 111, and part of the gas is captured by the first air guide pipe 111. The remaining gas that is not captured by the first air guide pipe 111 continues to diffuse freely along the diffusion direction, and after the part of the gas contacts the second air guide pipe 112, another part of the gas is captured by the second air guide pipe 112. Further preferably, the diffusion speed is calculated according to the response time difference marked by the identification modules 2 respectively arranged in the first air guide pipe 111 and the second air guide pipe 112 and the length difference between the first air guide pipe 111 and the second air guide pipe 112.

[0032] Preferably, the gas gathering units 12 are arranged in a manner that the gas flow in a certain fan range is guided to flow into the guide module 1, and the gas gathering units 12 arranged at the gas inlet ends of the first gas guide pipe 111 and the second gas guide pipe 112 do not overlap in the axial projection plane. Preferably, the gas gathering units 12 can facilitate the gas to enter the guide unit 11 in a more effective diffusion manner, avoiding the situation that when the guide unit 11 is perpendicular to or opposite to the gas flow direction, the gas cannot effectively enter the guide unit 11 under the traction of the gas flow, thereby reducing the actual detected gas concentration and diffusion condition. As shown in Figure 2 the two gas gathering units 12 can be spliced into a cone, and a single gas gathering unit 12 can be a half cone divided from the center line. The gas gathering units 12 on the first gas guide pipe 111 and the second gas guide pipe 112 do not stagger in the axial direction, so that the gas gathering units 12 on the first gas guide pipe 111 do not block the path of the gas diffusion drift to the position of the second gas guide pipe 112. The arrangement of the gas gathering units 12 can weaken the influence of the gas flow on the gas diffusion in a small range to a certain extent, so as to obtain the diffusion condition of the gas in space without external force pushing. Preferably, the calculation of the above diffusion speed is more in line with the gas diffusion state without wind or gas flow pushing, therefore, in order to further grasp the actual diffusion condition of the gas, the system adjusts the angle of the guide unit 11 so that the guide unit 11 is consistent with the diffusion direction of the gas, thereby more accurately grasping the actual diffusion condition of the gas under the pushing of the gas flow. Preferably, the arrangement of the first gas guide pipe 111 and the second gas guide pipe 112 with length difference makes the two recognition modules 2 identify the change of the concentration of the specific component in the gas following the diffusion of the gas by comparison, so as to analyze the diffusion direction of the gas and the gradual dilution of the gas by the environment air in the diffusion process according to the change of the gas concentration, thereby obtaining the distribution condition of the gas in a certain space.

[0033] Preferably, the pipe bodies of the first gas guide pipe 111 and the second gas guide pipe 112 are provided with filter modules 4 capable of filtering the interference components. The filter modules 4 can filter out the interference components in the gas that affect the recognition result in a component separation manner, so that the recognition modules 2 can output the recognition result without interference error.

[0034] Preferably, the pipe ends of the first air guide pipe 111 and the second air guide pipe 112 are selectively installed with a driving unit 13 capable of guiding directional flow of the gas. The driving unit 13 is capable of adjusting its working state under the control of the analysis module 3, so that the analysis module 3 can analyze the working state of the identification module 2 by using the changing gas flow rate in the pipe. Specifically, the driving unit 13 can determine whether the identification module 2 is in an environment with gas accumulation and thus identification abnormality by changing the gas flow rate when the continuous identification response result curves of the two identification modules 2 appear abnormal fluctuations, i.e., the concentration of a specific component in the gas continuously identified by a single identification module 2 changes, while the continuous identification result of the other identification module 2 does not change. The working adjustment of the driving unit 13 can also improve the effectiveness of the filtering module 4 in filtering interference components. When the content of interference components such as water is high, i.e., the humidity is high, the driving rate of the driving unit 13 can be reduced to slow down the flow rate of the gas in the pipe, so that the interference components in the gas can be effectively filtered out.

[0035] Preferably, the rotating support 14 can support the flow guide unit 11, and the rotating support 14 is capable of rotating under the control of the analysis module 3, i.e., the rotating support 14 adjusts the flow direction of the flow guide unit 11 according to the diffusion speed and distribution of the gas analyzed by the analysis module 3, so that the axial direction of the flow guide unit 11 can overlap with one diffusion direction of the gas.

[0036] Preferably, the at least two flow guide units 11 are provided with identification modules 2 capable of identifying the gas flowing directionally in the inner cavities of the flow guide units 11, so that the identification modules 2 located in different flow guide units 11 identify the gas in the specified area multiple times with time intervals. Preferably, the different identification modules 2 complete multiple identifications of the same gas on the diffusion path in a manner that they make identification responses with intervals based on the different distances between the flow guide units 11 corresponding thereto and the gas source diffusing in the specified area. Specifically, the identification module 2 includes a first identification unit 21 arranged in the first air guide pipe 111 and a second identification unit 22 arranged in the second air guide pipe 112. The first identification unit 21 and the second identification unit 22 make identification responses when detecting that the gas contains a specific component, and synchronously mark the response time point, so as to calculate the diffusion speed of the gas when it diffuses a specified distance by using the time difference between the identification responses of the first identification unit 21 and the second identification unit 22.

[0037] The present application can detect high concentration gas. When there are multiple gas pipeline output ports, the output ports can be arranged axially with the axis of the rotating support 14 as the center line and the distance between the inlet of the flow guide unit 11 and the rotating support 14 as the radius. In this way, the axial direction of the flow guide unit 11 of the present application can be moved periodically, so that the inlet of the flow guide unit 11 can be periodically and sequentially connected to each gas pipeline output port for gas detection. For multiple gas pipeline output ports, the present application can realize gas detection of multiple gas pipeline output ports by only setting one gas identification system, reducing the number of gas identification system settings. The gas output by each gas pipeline output port can be periodically discharged sample gas.

[0038] Embodiment 2

[0039] This embodiment is a further improvement of embodiment 1, and the repeated contents will not be described again.

[0040] As shown in Figure 3 The filter module 4 includes a housing 41 and a filter pipeline 42 arranged in the housing 41. Preferably, the filter pipeline 42 can change the flow rate and flow of the gas flowing into its channel in multiple ways, so that the interfering components in the gas can be separated, and the identification module 2 can accurately detect whether the gas contains specific components.

[0041] Specifically, the gas can enter the first air guide pipe 111 and the second air guide pipe 112 after passing through the gas gathering unit 12, and the interfering components in the gas can pass through the filter membrane as the pipeline wall of the filter pipeline 42 and be adsorbed by the adsorption unit 43 arranged between the housing 41 and the filter pipeline 42.

[0042] Embodiment 3

[0043] The present embodiment provides a gas identification method based on differential collection, which at least includes:

[0044] Two flow guide units 11 with different axial sizes and parallel to each other are arranged;

[0045] The identification module 2 capable of identifying the gas flowing in the inner chamber of the flow guide unit 11 is arranged in the two flow guide units 11, so that the identification module 2 located in different flow guide units 11 identifies the gas in the specified area multiple times with a time interval;

[0046] The identification module 2 transmits the identification results and response time obtained by it to the analysis module 3 for comparison and analysis;

[0047] The analysis module 3 analyzes the diffusion distribution trend of the gas and the concentration of the specific component contained in the gas according to the identification result and the response time of the identification module 2.

[0048] Preferably, the different identification modules 2 complete the multiple identifications of the same gas on the diffusion path in a manner that they are spaced apart according to the different distances between the corresponding flow guide units 11 and the gas source diffusing in the designated area.

[0049] It should be noted that the above specific embodiments are exemplary, and those skilled in the art can think of various solutions under the inspiration of the disclosure of the present application, and these solutions also belong to the disclosed range of the present application and fall within the protection scope of the present application. Those skilled in the art should understand that the specification and drawings of the present application are illustrative and not constitute a limitation on the claims. The protection scope of the present application is defined by the claims and their equivalents. Throughout the text, the features introduced by "preferably" are only optional ways and should not be understood as necessarily provided, therefore the applicant reserves the right to abandon or delete the relevant preferred features at any time.

Claims

1. A differential collection-based gas identification system comprising a guiding module for guiding and identifying a gas in a specified area in a diffused manner, characterized in that, The guiding module comprises two flow guiding units with different axial sizes and overlapping with one diffusion direction of the gas in the axial direction, and The identification modules for differentially identifying the gas flowing directionally in the inner chamber of the flow guiding unit are arranged in the two flow guiding units with relative displacement, the first and second air guiding pipes with different lengths of the flow guiding unit capture the gas diffusing in the designated area with time interval, so that the identification modules in different flow guiding units identify the gas in the designated area with time interval, The different identification modules complete the multiple identifications of the same gas in the diffusion path in a manner that they respond to the identification with interval based on the different distances between the flow guiding unit corresponding to the identification module and the source of the gas diffusing in the designated area, and the identification modules transmit the identification results and response time obtained by them to the analysis module for comparison and analysis; The analysis module analyzes the diffusion distribution trend of the gas and the concentration of the specific component contained in the gas according to the identification results and response time of the identification module, and calculates the diffusion speed of the gas according to the time difference of the response time and the length difference of the first and second air guiding pipes, The rotating support of the guiding module adjusts the flow guiding direction of the flow guiding unit according to the diffusion speed and distribution of the gas analyzed by the analysis module, the rotating support controls the rotation of the flow guiding unit so that the axial direction of the flow guiding unit overlaps with one diffusion direction of the gas, and the analysis module analyzes the size of the included angle between the guiding module and the diffusion direction of the gas according to the analysis results and the actual monitored airflow direction, thereby controlling the direction adjustment of the guiding module so that the axial direction of the guiding module coincides with the diffusion direction of the gas.

2. The differential collection based gas identification system of claim 1, wherein, The first air guiding pipe (111) and the second air guiding pipe (112) are arranged in parallel, and the gas outlet ports of the first air guiding pipe (111) and the second air guiding pipe (112) are flush, and the axial extension length of the first air guiding pipe (111) is longer than that of the second air guiding pipe (112).

3. The differential collection based gas identification system of claim 2, wherein, When the gas in the designated area diffuses, at least part of the gas enters the first air guiding pipe (111) and is identified by the identification module (2), The gas that does not enter the first air guiding pipe (111) can further diffuse along the diffusion direction, so that after an interval time when the first air guiding pipe (111) captures the gas, at least part of the continuously diffusing gas enters the second air guiding pipe (112), so that the first air guiding pipe (111) and the second air guiding pipe (112) capture the gas diffusing in the designated area with time interval.

4. The differential collection based gas identification system of claim 3, wherein, The identification modules (2) installed in the first air guide pipe (111) and the second air guide pipe (112) respectively can mark the time points of the gas response, so that the analysis module (3) can calculate the diffusion speed of the gas according to the time difference between the time points of the gas response of the different identification modules (2) and the length difference of the first air guide pipe (111) and the second air guide pipe (112).

5. The differential collection based gas identification system of claim 4, wherein, The guide module (1) further comprises a gas gathering unit (12) arranged at the air inlet end of the flow guide unit (11), which is arranged in a manner of guiding the directional flow of the gas in a certain fan range into the guide module (1), and the gas gathering units (12) arranged at the air inlet ends of the first air guide pipe (111) and the second air guide pipe (112) do not overlap in the axial projection plane.

6. The differential collection based gas identification system of claim 5, wherein, The pipe body ends of the first air guide pipe (111) and the second air guide pipe (112) are selectively provided with a driving unit (13) capable of guiding the directional flow of the gas, and the driving unit (13) can adjust its working state under the control of the analysis module (3), so that the analysis module (3) can analyze the working state of the identification module (2) by using the changed gas flow rate in the pipe body.

7. The differential collection based gas identification system of claim 6, wherein, The identification module (2) comprises a first identification unit (21) arranged in the first air guide pipe (111) and a second identification unit (22) arranged in the second air guide pipe (112), The first identification unit (21) and the second identification unit (22) make an identification response when detecting that the gas contains a specific component, and mark the response time point synchronously, so as to calculate the diffusion speed of the gas when it diffuses a specified distance by using the time difference between the identification responses of the first identification unit (21) and the second identification unit (22).

8. A differential collection-based gas identification method using the system according to any one of claims 1 to 7, characterized by, Comprise: Two flow guide units (11) with different axial dimensions and parallel to each other are arranged; The identification module (2) capable of identifying the directional flow of the gas in the inner chamber of the flow guide unit (11) is arranged in the two flow guide units (11), so that the identification modules (2) located in different flow guide units (11) identify the gas in the specified area multiple times with a time interval; The identification module (2) transmits the identification results and response times obtained by it to the analysis module (3) for comparison and analysis; The analysis module (3) analyzes the diffusion distribution trend of the gas and the concentration of the specific component contained in the gas according to the identification results and response times of the identification module (2).

9. The differential collection based gas identification method of claim 8, wherein, The different identification modules (2) complete multiple identifications of the same gas in the diffusion path in a manner of making identification responses with intervals based on the different distances between the flow guide units (11) corresponding to them and the gas source diffusing in the specified area.

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