Multi-point VOCs leakage detection method and system, intelligent terminal and storage medium

Abstract

The invention relates to a multi-point VOCs leakage detection method and system, an intelligent terminal and a storage medium, and relates to the technical field of gas leakage detection.The method comprises the steps that object type information of a detection area is obtained; sampling gas in the detection areas is collected through sampling pipelines, the sampling gas is conveyed to the detection host, and the sampling pipelines are in one-to-one correspondence with the detection areas; detecting the concentration of the sampled gas through a detection host to obtain the component concentration of volatile organic compounds (VOCs); according to the article type information and the VOCs component concentration of the detection area, judging whether leakage gas exists in the detection area or not; if yes, leakage alarm information is generated, and a leakage alarm is given out according to the leakage alarm information. The device and the method have the effect of detecting a leaked gas generation source and leaked gas components in time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas leakage detection, in particular to a multi-point VOCs leakage detection method and system, an intelligent terminal and a storage medium. BACKGROUND

[0002] At present, in industrial production and storage environments, VOCs (Volatile Organic Compounds) are one of the common air pollutants. Due to the characteristics of volatile, diffusible and flammable, once leakage occurs, not only environmental pollution will be caused, but also safety accidents such as fire, explosion or poisoning of personnel may be caused.

[0003] In related technologies, for indoor environments (detection rooms), air samples in the indoor environment are usually sucked through fixed detection pipelines, and VOCs component detection is performed on the air samples to determine whether the items located in the indoor environment have leakage. When the items in the indoor environment have a small leakage, the leaked gas is diluted by the indoor air, so that the VOCs component detection on the air samples cannot detect the leakage and the location of the leakage source. For outdoor environments, portable gas detection instruments are usually used to detect valves and other items on site.

[0004] According to the related technologies in the above, the source of the leaked gas and the component of the leaked gas cannot be detected in time. SUMMARY

[0005] In order to detect the source of the leaked gas and the component of the leaked gas in time, the present application provides a multi-point VOCs leakage detection method, system, intelligent terminal and storage medium.

[0006] In a first aspect, the present application provides a multi-point VOCs leakage detection method, which adopts the following technical solution: A multi-point VOCs leakage detection method, comprising: Obtaining item type information of a detection area; Collecting sampling gas of the detection area through a sampling pipeline, and conveying the sampling gas to a detection host, wherein the sampling pipeline corresponds to the detection area one by one; Conducting concentration detection on the sampling gas through the detection host to obtain a volatile organic compound (VOCs) component concentration; According to the item type information of the detection area and the VOCs component concentration, determining whether there is leaked gas in the detection area; If there is, generating a leakage alarm information and issuing a leakage alarm according to the leakage alarm information.

[0007] By adopting the technical scheme, one-to-one correspondence of the sampling pipeline and the detection area can be realized in a multi-detection area environment, matching analysis can be performed in combination with the type information of the articles in the detection area and the detected VOCs component concentration, so that the detection area where the leakage gas occurs and the leakage gas component can be determined in a timely manner, and a leakage alarm can be issued, thereby improving the safety of the working environment.

[0008] Optionally, real-time synchronous sampling operation is performed through the air detection pipelines to obtain a mixed air sample; It is judged whether there is leakage gas in the mixed air sample; If yes, the detection room is detected according to a preset detection method; If no, a multi-point detection step is performed according to a preset sampling period, the multi-point detection step being a step of sequentially collecting sampling gas of the detection area through the sampling pipelines in the detection room, and sequentially detecting the sampling gas through the detection host to obtain a VOCs component concentration sequence; It is judged whether there is leakage gas according to the VOCs component concentration sequence; In the case where there is leakage gas, the target detection area where the leakage gas exists is confirmed according to the VOCs component concentration sequence.

[0009] By adopting the technical scheme, first, the mixed air sample is synchronously collected through the air detection pipelines to quickly judge whether there is leakage gas, thereby avoiding the problem of detection host overload and detection precision decline caused by simultaneously enabling a large number of sampling pipelines for a long time; when no leakage gas is detected, the multi-point detection step is performed according to the preset sampling period to accurately sample and analyze each detection area one by one, thereby realizing an efficient detection process from rapid screening to accurate positioning, and balancing detection efficiency and detection precision, thereby significantly improving the stability and reliability of leakage gas detection.

[0010] Optionally, the detection room is detected according to a preset detection method, including: Air samples of the detection room are sequentially collected through the air detection pipelines, and the air samples are sequentially detected through the sampling host to obtain an air sample concentration sequence; The target detection room where the leakage gas exists is confirmed according to the sample air sequence; The multi-point detection step is performed in the target detection room to obtain the target detection area where the leakage gas exists.

[0011] By adopting the technical scheme, after detecting that the mixed air sample has a leakage gas, air samples are sequentially collected for each detection room to establish an air sample concentration sequence, so that the target detection room with the leakage gas is quickly located without starting all the sampling pipelines at different times, and multi-point accurate detection is performed in the target detection room, which ensures the leakage detection efficiency and the accuracy and positioning precision of the leakage source identification.

[0012] Optionally, it is judged whether a deviated detection area with a VOCs component concentration inconsistent with the article type information exists in the target detection area; If yes, a current ventilation direction in the detection room is acquired; It is judged whether the deviated detection area is located at a downwind area of the target detection area along the current ventilation direction; If not, a leakage transfer alarm is issued; If yes, the current ventilation direction is changed to a target ventilation direction opposite in direction; It is judged whether the position of the deviated detection area is changed; If yes, it is determined that the leakage gas of the target detection area is transferred to the deviated detection area; If not, it is determined that the leakage of the target detection sample is transferred to the deviated detection area, and a leakage transfer alarm is issued.

[0013] By adopting the technical scheme, when an abnormal VOCs component is detected, the gas diffusion direction is judged in combination with the ventilation direction, so that the normal diffusion of the leakage gas and the leakage transfer are distinguished; when the deviated detection area is not in the downwind direction, a leakage transfer alarm can be issued in time to prompt that the leakage transfer may occur; when the deviated detection area is in the downwind direction, whether the leakage source is changed is verified by reversing the ventilation direction, so that whether the leakage gas diffuses along the wind direction or the leakage source is transferred is determined, so that the leakage source transfer can be found in time and the probability that the gas article in the pollution detection room is polluted due to the leakage source transfer is reduced.

[0014] Optionally, the equivalent flow resistance in the sampling pipeline is calculated according to the pipeline length and the pipeline inner diameter of the sampling pipeline; According to the rated air flow of the sampling pump, the target sampling flow of each sampling pipeline is determined; According to the rated air flow and the equivalent flow resistance, the available pressure difference of the air inlet of each sampling pipeline is determined; Based on the fluid continuity principle and the pressure difference distribution relationship, a distribution relationship formula of the opening area of the air inlet of the sampling pipeline and the sampling gas flow is established; According to the distribution relationship formula and the available pressure difference, a best opening area set satisfying that the actual sampling flow of the sampling pipeline is equal to the target sampling flow is solved; According to the optimal opening area set, the opening area of the air inlet of each sampling pipeline is adjusted.

[0015] By using the above technical scheme, the equivalent flow resistance can be calculated according to the length and inner diameter of the sampling pipeline, and the optimal opening area of the air inlet of each sampling pipeline can be dynamically determined in combination with the rated suction flow and pressure difference distribution relationship of the sampling pump, so that the actual sampling flow of each channel remains consistent. This method realizes flow balance and stable control during parallel sampling of multiple pipelines, avoids detection errors or insufficient representation of gas samples caused by flow deviation, and thus improves the accuracy and reliability of multi-point VOCs detection.

[0016] Optionally, it is judged whether the VOCs component concentration of the sampling gas is greater than a first preset collection gas concentration. If yes, the sampling pipeline with the VOCs component concentration greater than the preset collection gas concentration is marked as a collection pipeline. All sampling pipelines except the collection pipeline are closed. The power of the sampling pump is increased, and the sampling gas in the collection pipeline is collected.

[0017] By using the above technical scheme, when it is detected that the VOCs component concentration of the sampling gas exceeds the preset collection gas concentration threshold, the corresponding sampling pipeline can be automatically identified and marked as a collection pipeline, and the sampling pipeline of the non-collection pipeline can be closed, so as to provide negative pressure output of the sampling pump acting on the collection pipeline, thereby improving the absorption capacity of the collection pipeline for the leaked gas and reducing the diffusion range of the leaked gas.

[0018] Optionally, it is judged whether the VOCs component concentration of the sampling gas is greater than a second preset collection gas concentration, wherein the second preset collection gas concentration is greater than the first preset collection gas concentration. If greater, it is judged whether the VOCs component of the adjacent pipeline adjacent to the collection pipeline and the VOCs component of the collection pipeline produce a target chemical reaction after mixing. If yes, a target adjacent pipeline in the adjacent pipeline is determined, wherein the target adjacent pipeline refers to the pipeline in which the VOCs component of the adjacent pipeline and the VOCs component of the collection pipeline produce a target chemical reaction after mixing. The power of the sampling pump is increased, and the target adjacent pipeline is closed. If no, all adjacent pipelines are kept in an open state.

[0019] By adopting the technical scheme, when it is detected that the VOCs component concentration of the sampling gas exceeds the second preset collection gas concentration, it can be further judged whether the gas components in the collection pipeline and its adjacent pipelines are likely to react after mixing. If there is a risk of reaction, the corresponding target adjacent pipeline is closed to prevent the leaked gas from being sucked into the collection pipeline and reacting with the gas sucked into the collection pipeline, and if there is no risk of reaction, all adjacent pipelines are kept open to improve the collection capacity for the leaked gas and further reduce the diffusion range of the leaked gas.

[0020] In a second aspect, the present application provides a multi-point VOCs leakage detection system, which adopts the following technical scheme: A multi-point VOCs leakage detection system comprises: An acquisition module is configured to acquire item type information and VOCs component concentration. A memory is configured to store a program of the multi-point VOCs leakage detection method. A processor, and the program in the memory can be loaded and executed by the processor and implement the multi-point VOCs leakage detection method.

[0021] By adopting the technical scheme, the sampling pipeline and the detection region can be one-to-one corresponding in a multi-detection region environment. The detection host can combine the item type information in the detection region and the detected VOCs component concentration for matching analysis, so as to timely find the detection region where the leaked gas occurs and determine the leaked gas component, and issue a leakage alarm, thereby improving the safety of the working environment.

[0022] In a third aspect, the present application provides an intelligent terminal, which adopts the following technical scheme: An intelligent terminal comprises a memory and a processor, and the memory stores a computer program capable of being loaded and executed by the processor to implement the method in any one of the above aspects.

[0023] In a fourth aspect, the present application provides a computer storage medium capable of storing a corresponding program, which has the characteristics of facilitating timely detection of the leaked gas source and the leaked gas component, and adopts the following technical scheme: A computer readable storage medium stores a computer program capable of being loaded and executed by a processor to implement any one of the above multi-point VOCs leakage detection methods.

[0024] In summary, the present application has at least one of the following beneficial technical effects: 1. The one-to-one correspondence between the sampling pipeline and the detection area can be realized in a multi-detection area environment, the type information of the articles in the detection area can be combined with the detected VOCs component concentration for matching analysis, so as to timely find the detection area where the leakage gas occurs and determine the leakage gas component, and issue a leakage alarm, thereby improving the safety of the working environment; 2. First, the mixed air sample is synchronously collected through the air detection pipeline to quickly judge whether there is leakage gas, thereby avoiding the problem of detection host overload and detection precision decline caused by long-time simultaneous use of a large number of sampling pipelines; when no leakage gas is detected, the multi-point detection step is executed according to the preset sampling period, and accurate sampling and component analysis are performed on each detection area one by one, thereby realizing an efficient detection process from rapid screening to accurate positioning, so as to balance the detection efficiency and the detection precision, and significantly improve the stability and reliability of the leakage gas detection; 3. The equivalent flow resistance can be calculated according to the length and inner diameter of the sampling pipeline, and the best opening area of the air inlet of each sampling pipeline can be dynamically determined by combining the rated air flow of the sampling pump and the differential pressure distribution relationship, so that the actual sampling flow of each channel remains consistent. This method realizes flow balance and stable control during multi-pipeline parallel sampling, avoids detection errors or insufficient gas sample representativeness caused by flow deviation, and thereby improves the precision and reliability of multi-point VOCs detection. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a schematic diagram of a multi-point VOCs leakage detection device in an embodiment of the present application.

[0026] Figure 2 is a flowchart of a multi-point VOCs leakage detection method in an embodiment of the present application.

[0027] Figure 3 is a flowchart of a multi-detection room VOCs leakage detection method in an embodiment of the present application.

[0028] Figure 4 is a schematic diagram of a multi-detection room leakage detection device in an embodiment of the present application.

[0029] Figure 5 is a flowchart of detecting a detection room according to a preset detection method in an embodiment of the present application.

[0030] Figure 6 is a flowchart of a leakage substance transfer detection method in an embodiment of the present application.

[0031] Figure 7 is a flowchart of a sampling pipeline opening distribution method in an embodiment of the present application.

[0032] Figure 8This is a schematic flowchart of a leaked gas collection method according to an embodiment of this application.

[0033] Figure 9 This is a schematic flowchart of a collaborative gas collection method according to an embodiment of this application.

[0034] Explanation of reference numerals in the attached diagram: 1. Sample gas inlet unit; 2. Sampling pipeline; 3. Sampling pump; 4. Detection host; 5. Air detection pipeline; 6. Gas delivery pipeline; 7. Detection chamber; 71. Detection area. Detailed Implementation

[0035] To make the purpose, technical solution, and advantages of this application clearer, the following description is provided in conjunction with the appendix. Figure 1 -Appendix Figure 9 The present application will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the application.

[0036] This application discloses a multi-point VOCs leakage detection device. (Refer to...) Figure 1 The multi-point VOCs leak detection device includes: a sample gas inlet unit 1, several sampling pipes 2, a sampling pump 3 installed at the sample gas inlet unit 1, and a detection host 4 connected to the sampling pump 3. One end of each sampling pipe 2 is connected to the sample gas inlet unit 1, and the other end extends to different detection areas 71 within the detection chamber 7. Figure 1 The detection area 71 is divided into several regions by dashed lines, and each detection area 71 corresponds one-to-one with a sampling pipe 2. The air inlet of the sampling pipe 2 can be adjusted according to the storage location of the item to be detected in the detection area 71, so that the air inlet is aligned with the item to be detected, thereby improving the efficiency of effectively detecting gas leaks.

[0037] The sample gas inlet unit 1 is used to collect and initially distribute sample gases from different sampling pipes 2. A solenoid valve is installed at the inlet of each sampling pipe 2 in the sample gas inlet unit 1. The opening and closing state and degree of opening of the sampling pipe 2 can be changed by adjusting the opening and closing degree of the solenoid valve.

[0038] The sampling pump 3 can be a vacuum pump, used to provide negative pressure drive for the transmission of the sampling pipeline 2, so that the sampled gas from each detection area 71 is drawn through the corresponding sampling pipeline 2 to the sample gas inlet unit 1 and then delivered to the detection host 4 for detection. The detection host 4 can perform VOCs component detection on the sample gas.

[0039] This application discloses a method for detecting VOCs leakage at multiple locations. (Refer to...) Figure 2 Multi-point VOCs leakage detection methods include: Step S101: Obtain the item type information of the detection area.

[0040] The detection area refers to a space area where the sampling pipeline air inlet is installed, which can be a local space in the detection room, a shelf position storing specific chemical substances, a periphery of a reaction kettle, or a periphery of a tank valve, etc.

[0041] The article type information refers to the attribute information of the monitored articles or equipment in the detection area, such as article name, chemical composition, use state, production process stage, or volatile level, etc., which is used to determine the types of volatile organic compounds VOCs that can be generated in the area.

[0042] The article type information can be obtained by manual input, equipment label identification (such as RFID, barcode scanning), or system preset.

[0043] For example, in a chemical production workshop, the detection area A1 stores toluene tanks, and the detection area A2 is a mixed solvent blending area. By reading the preset database: Detection area A1→Article type: toluene solvent; Detection area A2→Article type: ester mixture.

[0044] Step S102: Collecting sampling gas of the detection area through the sampling pipeline, and conveying the sampling gas to the detection host, wherein the sampling pipeline corresponds to the detection area one by one.

[0045] Each sampling pipeline corresponds to a detection area, which is used to collect sample gas in the area, ensuring the spatial independence of the detection results.

[0046] The sampling gas refers to an air sample containing target VOC components in the detection area, which can include normal air or a mixture of leaked gas.

[0047] Among them, the sampling pump forms a negative pressure airflow, so that the sampling gas (air sample) in the detection area is sucked into the sample gas inlet unit through the corresponding sampling pipeline, and then conveyed to the detection host after being collected, stabilized, and filtered by the sample gas inlet unit.

[0048] Step S103: Concentration detection of the sampling gas by the detection host to obtain the concentration of volatile organic compounds VOC components.

[0049] The detection host refers to a device for analyzing the components of the sampling gas and outputting the detection results.

[0050] Its internal includes a gas detection module, a signal acquisition module, a data processing module, and a display alarm module. Among them: Gas detection module: used for component identification and concentration determination of the incoming sampling gas; Signal acquisition module: for converting the electrical signal output by the detection module into a concentration numerical signal; Data processing module: for storing, comparing and statistically analyzing the detection results of multiple detection areas; Display alarm module: for real-time display of detection results or triggering of alarm signals.

[0051] The VOC component concentration refers to the content of various volatile organic compounds in the sampled gas, which can be expressed in ppm or ppb, representing the concentration level of the target organic matter in the air of the detection area.

[0052] The detection host starts the internal detection module to perform real-time analysis on the sample gas.

[0053] The detection host can use photoionization detection (PID), Fourier transform infrared spectroscopy (FTIR), mass spectrometry (MS), or other volatile organic compound detection technologies to determine the VOC components and their concentrations in the sample gas by detecting characteristic ion peaks, absorption peaks, or ionization signal intensity. The data processing module converts the detection signal into readable numerical values and records the corresponding detection area number, thereby obtaining the VOC component concentration and the VOC component concentration sequence.

[0054] For example, when the detection host analyzes the sampled gas of detection areas A1 and A2: the detection result of detection area A1 shows that the toluene concentration is 38 ppm; the detection result of detection area A2 shows that the ethyl acetate concentration is 5 ppm; according to the preset item type information and the preset safety concentration threshold (toluene safety concentration 10 ppm, ethyl acetate 25 ppm), it is judged that the A1 detection area has a VOC leakage risk, and a leakage alarm information is generated. The detection host automatically marks the number and timestamp of the detection area while outputting the result, realizing the time sequence recording of multiple point concentrations.

[0055] Step S104: According to the item type information and the VOC component concentration of the detection area, it is judged whether there is a leakage gas in the detection area.

[0056] Leakage gas refers to gas detected in the detection area whose VOC component concentration exceeds the corresponding preset safety concentration threshold, or components that do not match the item type.

[0057] After the host detects the concentration of VOCs components in each detection area, the host calls the information of the type of the object stored in the database to match the target VOCs component corresponding to the area and the preset safe concentration threshold. By comparing the detected actual VOCs component, if the detected VOCs component is consistent with the VOCs component corresponding to the target object type, and the concentration exceeds the preset safe concentration threshold, it is determined that there is a leakage gas in the detection area; if the detected VOCs component does not match the VOCs component corresponding to the target object type, it can also be regarded as an abnormal leakage signal, that is, there is a leakage gas.

[0058] For example, the object stored in a certain detection area is iron block, that is, no VOCs component gas can be generated, but in the actual detection process, the sampling gas collected through the detection area contains non-toluene components (such as ethyl acetate), which is determined as a non-matching component leakage, and an abnormal leakage signal is generated, that is, there is a leakage gas. Step S105: If yes, generating a leakage alarm information and issuing a leakage alarm according to the leakage alarm information.

[0059] In another aspect, if there is no leakage gas, no leakage alarm information is generated.

[0060] In a feasible embodiment, when it is determined that there is a leakage gas in the detection area, a leakage alarm information containing the information of the detection area is immediately generated. The leakage alarm information includes fields such as detection area number, VOCs component, VOCs component concentration, preset safe concentration threshold corresponding to the VOCs component, over-standard index, leakage level, detection time, and alarm state. The host executes alarm strategy control according to the leakage alarm information: starting the audible and visual alarm and the buzzer to issue a leakage warning to the on-site personnel.

[0061] The embodiment of the present application provides a VOCs leakage detection method for a plurality of detection rooms, referring to Figure 3 The method comprises the following steps. Step S201: synchronously sampling through a plurality of air detection pipelines to obtain a mixed air sample.

[0062] Referring to Figure 1 and Figure 4 , there are a plurality of detection rooms, and each detection room is provided with an air detection pipeline 5. In the embodiment, the number of detection rooms is 3, and each detection room is provided with a sample gas intake unit 1, a plurality of sampling pipelines 2, and a sampling pump 3. The sampling gas collected by the sampling pump 3 is delivered to the detection host 4 through the gas delivery pipeline 6 for concentration detection.

[0063] The mixed air sample refers to a comprehensive gas sample formed by the air samples synchronously collected through a plurality of air detection pipelines after being collected and mixed in the sample gas intake unit.

[0064] Close all electromagnetic valves corresponding to the sampling pipelines by closing the air sampling units corresponding to the sample gas of the plurality of detection rooms, and keep the electromagnetic valves corresponding to the air detection pipelines open, and start the sampling pumps corresponding to the plurality of detection rooms to realize synchronous sampling through the plurality of air detection pipelines, so as to obtain mixed air samples.

[0065] Step S202: Determine whether there is a leakage gas in the mixed air sample.

[0066] After the detection host obtains the mixed air sample, the VOCs components in the sample are detected and analyzed in real time. The detected VOCs component concentration is compared with the preset safety concentration threshold corresponding to the detection room: if the VOCs component concentration of any mixed air sample exceeds the corresponding preset safety concentration threshold, it is determined that there is a leakage gas in the mixed air sample; if all VOCs component concentrations are lower than the corresponding preset safety concentration threshold, it is determined that there is no leakage gas. In the case of leakage gas, step S203 is executed, and in the case of no leakage gas, step S204 is executed.

[0067] Step S203: If yes, the detection room is detected according to the preset detection method.

[0068] The detection of the detection room according to the preset detection method can refer to the steps in the embodiments, which will not be described here. Figure 5

[0069] Step S204: If no, execute the multi-point detection step according to the preset sampling period. The multi-point detection step refers to the step of sequentially collecting the sampling gas of the detection area through the sampling pipeline in the detection room, and sequentially detecting the concentration of the sampling gas through the detection host to obtain the VOCs component concentration sequence.

[0070] The preset sampling period is a preset constant, which can be adjusted according to actual needs. Since the air detection pipeline directly collects the air of the detection room as a sample, when there is a small leakage in a detection area, the VOCs component may be diluted in the mixed air sample, making it difficult to detect through the mixed air sample. If the sampling gas of the detection sample is continuously collected through the plurality of sampling pipelines, when the number of detection rooms is large, the detection host needs to detect the plurality of sampling gases simultaneously and continuously, which is easy to cause the detection host to overload and cause the detection precision to decrease or damage.

[0071] The VOCs component concentration sequence refers to the set of VOCs component concentrations of the sampling gas transported by the sampling pipeline in the multi-point detection process.

[0072] ​For example, when there is only one room to be detected, the sampling pipes of the room to be detected numbered p1, p2, p3, p4, p5, p6, p7, p8, and p9 are first closed, and then the p1 sampling pipe is started. After the sampling time reaches the preset detection duration, the p1 sampling pipe is closed and the p2 sampling pipe is started. After the sampling time reaches the preset detection duration, the p2 sampling pipe is closed and the p3 sampling pipe is started. In this way, the sampling pipes are sequentially used to collect the sampling gas of the room to be detected for detection, and a VOCs component concentration sequence is obtained. The VOCs component concentration sequence further includes the sampling pipe number and the sampling time.

[0073] For example, there are detection room A, detection room B, and detection room C. The detection room A has sampling pipes numbered a1, a2, a3, a4, a5, a6, a7, a8, and a9, the detection room B has sampling pipes numbered b1, b2, b3, b4, b5, b6, b7, b8, and b9, and the detection room C has sampling pipes numbered c1, c2, c3, c4, c5, c6, c7, c8, and c9. First, the a1 sampling pipe in the detection room A, the b1 sampling pipe in the detection room B, and the c1 sampling pipe in the detection room C are simultaneously opened, and the remaining sampling pipes are kept closed. The corresponding sampling gas is transported to the detection host for concentration detection through the a1, b1, and c1 sampling pipes, and the current VOCs component concentration P1 is recorded. When the detection reaches the preset detection duration, the a1, b1, and c1 sampling pipes are closed, and the a2, b2, and c2 sampling pipes are opened. The above steps are repeated to detect the gas concentration, and the next round of VOCs component concentration P2 is obtained. In this way, the sampling pipes in the detection rooms are sequentially used to collect the sampling gas of the detection area, and the detection host is sequentially used to detect the concentration of the sampling gas. The VOC component concentration obtained in each round of detection is combined with the sampling pipe number in time sequence to form a complete VOCs component concentration sequence.

[0074] Step S205: determining whether there is a leakage gas according to the VOCs component concentration sequence.

[0075] The VOCs component concentration sequence is obtained by combining several VOCs component concentrations. By comparing the VOCs component concentration with the corresponding preset safety concentration threshold, if the VOCs component concentration of any detection area exceeds the corresponding preset safety concentration threshold, it is determined that there is a leakage gas in the detection area.

[0076] Step S206: in the case where there is a leakage gas, determining the target detection area with the leakage gas according to the VOCs component concentration sequence.

[0077] When the detection host determines that there is a leakage gas, according to the detection room number and the sampling pipeline number recorded in the VOCs component concentration sequence, extract the concentration data of all VOCs components whose concentration is greater than the corresponding preset safety concentration threshold. According to the concentration data, determine the corresponding detection room number and sampling pipeline number, after obtaining the sampling pipeline number, according to the sampling object type information corresponding to the sampling pipeline number, screen out the object type information matched with the VOCs component corresponding to the VOCs component concentration, and locate the target detection area where the leakage gas occurs according to the object type information.

[0078] For example, in the case where the VOCs component concentration P2 in the second round VOCs component concentration P2 is greater than the preset safety concentration threshold, the VOCs component concentration P2 is compared with the object type information in the corresponding detection area to screen out the object type information matched with the VOCs component, and the target detection area is determined according to the object type information.

[0079] Referring to Figure 5 According to the preset detection method, the detection room is detected, including: Step S301: sequentially pass through the air detection pipeline to sample the air sample of the detection room, and sequentially pass through the sampling host to detect the concentration of the air sample, and obtain the air sample concentration sequence.

[0080] The air sample concentration sequence refers to the VOCs component concentration data set obtained by the detection host after sequentially detecting the air samples of multiple detection rooms. The sequence is used to determine whether there is a leakage risk at the detection room level.

[0081] For example, the detection objects include detection room A, detection room B and detection room C. Among them, the air detection pipe in detection room A is marked as air_A, the air detection pipe in detection room B is marked as air_B, and the air detection pipe in detection room C is marked as air_C.

[0082] First, open air_A, detect the concentration of the air sample of detection room A, and record it as VOCs component concentration Q1; then close air_A and open air_B, and record the concentration of the air sample of detection room B as Q2; Finally, close air_B and open air_C, and record the concentration of the air sample of detection room C as Q3.

[0083] Combine the obtained VOCs component concentration to obtain {air_A: Q1, : air_B: Q2, air_C: Q3}, that is, the air sample concentration sequence.

[0084] Step S302: According to the sample air sequence, confirm the target detection room where the leakage gas exists.

[0085] The target detection room refers to a detection room in which a leakage gas exists.

[0086] The VOCs component concentration in the sample air sequence is compared with the corresponding preset safe concentration threshold value. If a certain VOCs component concentration is greater than the preset safe concentration threshold value, it is determined that the detection room corresponding to the VOCs component concentration is a target detection room in which a leakage gas exists.

[0087] For example, in the air sample concentration sequence {air_A: Q1, :air_B: Q2, air_C: Q3}, Q2 is greater than the corresponding preset safe concentration threshold value, and it is determined that detection B corresponding to air_B is a target detection room in which a leakage gas exists.

[0088] Step S303: performing a multi-point detection step in the target detection room to obtain a target detection area in which a leakage gas exists.

[0089] After obtaining the target detection room, a multi-point detection step is performed. The multi-point detection step can refer to the content of step S204.

[0090] The embodiments of the present application provide a leakage transfer detection method, which refers to Figure 6 The method comprises the following steps: Step S401: determining whether there is a deviation detection area in which the VOCs component concentration does not match the information of the type of the article in the target detection area.

[0091] The deviation detection area refers to a target detection area in which the VOCs component concentration detected in the target detection area does not match the VOCs component concentration corresponding to the information of the type of the article located in the target detection area.

[0092] After obtaining the VOCs component concentration of each target detection area, the information of the type of the article corresponding to the target detection area stored in the data is called, and the corresponding VOCs component is extracted according to the information of the type of the article. The VOCs component of each target detection area is compared with the corresponding VOCs component extracted according to the information of the type of the article, and the target detection area in which the two do not match is marked to obtain the deviation detection area.

[0093] Step S402: if yes, obtaining the current ventilation direction in the detection room.

[0094] The current ventilation direction refers to the direction of the ventilation system in the detection room. The initial direction of the direction is a preset direction, for example, from east to west.

[0095] In another aspect, if there is no deviation detection area in which the VOCs component concentration does not match the information of the type of the article in the detection area, no operation is performed.

[0096] Step S403: judging whether the deviated detection area is located at the downwind area of the target detection area along the current ventilation direction.

[0097] Wherein, a coordinate system is established in the top view direction of the detection room, and each detection area is divided in the coordinate system. The positions of the target detection area and the deviated detection area are marked in the coordinate system, the current ventilation direction is added to the coordinate system, the relative position vector ΔP between the target detection area and the deviated detection area is calculated according to the coordinate relationship, and it is judged whether the included angle θ between the direction of ΔP and the current ventilation direction vector is less than a preset included angle threshold (for example, 30°). If the included angle is less than the preset included angle threshold, it is considered that the deviated detection area is located at the downwind area of the target detection area; if the included angle is greater than the preset included angle threshold, it is considered that there is no direct airflow path between them.

[0098] Step S404: if not, issuing a leakage object transfer alarm.

[0099] The leakage object transfer alarm refers to an alarm for prompting that the object generating the leakage gas may be transferred. The alarm level of the alarm is greater than that of the leakage alarm.

[0100] When the deviated detection area is not located at the downwind direction of the target detection area, it indicates that the leakage gas is not naturally diffused along the ventilation airflow, but may be transferred. If the leakage object is transferred, not only the pollutants may be diffused to other detection areas, but also chemical reactions or cross-evaporation effects may occur between the pollutants and other gas components released by the objects in other detection areas, thereby causing new pollution sources or safety risks. When such an anomaly is identified, a leakage object transfer alarm is issued to prompt the monitoring personnel to take timely measures to prevent the leakage gas from further diffusing or causing undesirable chemical reactions.

[0101] Step S405: if located, changing the current ventilation direction to a target ventilation direction opposite in direction.

[0102] The target ventilation direction refers to the airflow direction opposite to the current ventilation direction formed by adjusting the air supply and exhaust devices. For example, when the current ventilation direction is “east→west”, the target ventilation direction is “west→east”.

[0103] If located, it is still not determined whether the leakage source of the leakage gas is located at the deviated detection area or is scattered to the deviated detection area along the ventilation airflow. Therefore, by changing the current ventilation direction to a target ventilation direction opposite in direction, it is further judged whether the deviated detection area still exists the VOCs component corresponding to the leakage gas.

[0104] Step S406: judging whether the position of the deviated detection area is changed.

[0105] The judgment condition for the change of the position of the deviated detection area is that the VOCs component detected from the deviated detection area after the current ventilation direction is changed is inconsistent with the VOCs component detected before the current ventilation direction is changed, that is, it is determined that the position of the deviated area is changed.

[0106] Step S407: If yes, it is determined that the leakage gas of the target detection area is transferred to the deviated detection area.

[0107] The transfer of the leakage gas of the target detection area to the deviated detection area means that the leakage gas of the target detection area is dispersed to the deviated detection area along the ventilation airflow.

[0108] Step S408: If no, it is determined that the leakage of the target detection sampling is transferred to the deviated detection area, and a leakage transfer alarm is issued.

[0109] If no, it means that the leakage source of the leakage gas is located in the deviated detection area, that is, after the ventilation direction is changed, the leakage gas is still generated from the deviated detection area, and therefore a leakage transfer alarm is issued.

[0110] The embodiment of the present application provides a sampling pipeline opening distribution method, referring to Figure 7 The method comprises the following steps. Step S501: Calculate the equivalent flow resistance in the sampling pipeline according to the pipeline length and the pipeline inner diameter of the sampling pipeline.

[0111] The equivalent flow resistance refers to the comprehensive resistance of the sampling pipeline to the gas flow under the condition of unit flow, including the pressure loss caused by the pipeline length and the inner diameter.

[0112] The pipeline length and the pipeline inner diameter can be measured and obtained by manually using a detection tool.

[0113] The gas is in a laminar flow state in the sampling pipeline. Based on the Hagen-Poiseuille law of circular tube fluid, the relationship of the gas flow, the pressure difference, the viscosity, the tube length and the tube diameter can be expressed as: Wherein, Q i represents the gas flow volume of the i-th sampling pipeline, P in,i represents the static pressure of the gas at the gas inlet of the i-th sampling pipeline, P out,i represents the static pressure of the gas at the outlet of the i-th sampling pipeline, D i represents the inner diameter (diameter) of the i-th sampling pipeline, L i represents the length of the i-th sampling pipeline, and μ represents the dynamic viscosity coefficient of the gas.

[0114] Wherein, according to the pressure difference = resistance x flow, the above formula is converted into wherein R i represents the equivalent flow resistance of the ith sampling conduit, i.e. Step S502: Determine the target sampling flow rate of each sampling conduit according to the rated air extraction flow rate of the sampling pump.

[0115] The sampling pump has a rated air extraction flow rate Q t when in operation. The rated air extraction flow rate Q t is the air extraction flow rate that the sampling pump can continuously provide under rated power. The rated air extraction flow rate can be read from the technical parameter table provided by the sampling pump manufacturer, or obtained by calibrating the flow rate of the sampling pump under standard temperature and pressure conditions.

[0116] When n sampling conduits are provided in the system to participate in gas sampling, in order to ensure that the flow rates of the sampling gas in the detection regions are consistent, the detection host will distribute the total air extraction flow rate Q t of the sampling pump to each sampling conduit in equal proportion, and the target sampling flow rate Q i of each sampling conduit is Q t = Q t / n. The calculation formula is as follows: wherein Q t represents the rated air extraction flow rate of the sampling pump, n represents the number of sampling conduits currently participating in gas sampling, and Q0 represents the target sampling flow rate, which is the unified flow rate standard that all sampling conduits hope to achieve.

[0117] Step S503: Determine the available pressure difference of the gas inlet of each sampling conduit according to the rated air extraction flow rate and the equivalent flow resistance.

[0118] The available pressure difference refers to the effective pressure difference that can be used to adjust the opening area of the gas inlet of the sampling conduit to maintain the target sampling flow rate after deducting the pressure drop caused by the flow resistance and local resistance of the sampling conduit from the total negative pressure that the sampling pump can provide under the rated air extraction flow rate.

[0119] wherein the total negative pressure ΔP pump that the sampling pump can provide under the rated air extraction flow rate is ΔP pump = Q t · Q t , and when the gas flows through the sampling conduit, part of the pressure difference is consumed by the internal friction and bending structure of the conduit, and the remaining part is the available pressure difference that can be used to adjust the opening area of the gas inlet. In order to achieve flow rate balance of each channel by adjusting the opening area of the gas inlet in the subsequent steps, the available pressure difference of each sampling conduit at the target sampling flow rate Q0 needs to be calculated first. The loss pressure drop of the sampling conduit can be obtained from the equivalent flow resistance R i and the target sampling flow rate Q0, i.e. ΔP loss,i loss = R i · Q0 ΔP loss,i The loss pressure drop of the i-th sampling pipeline.

[0120] The total negative pressure provided by the sampling pump and the pressure drops of the pipeline and the inlet meet a series relationship: ΔP pump = ΔP loss,i + ΔP available,i ΔP available,i represents the pressure drop caused by the sampling gas passing through the inlet of the sampling pipeline, that is, the available pressure difference.

[0121] Therefore, the available pressure difference of the i-th sampling pipeline is defined as: ΔP available,i = ΔP pump - R i · Q0 The pressure difference is used for throttling adjustment of the opening area of the inlet, so that the actual flow of each pipeline is consistent with the target flow.

[0122] Step S504: Based on the principle of fluid continuity and the pressure difference distribution relationship, a distribution relationship between the opening area of the inlet of the sampling pipeline and the flow of the sampling gas is established.

[0123] The opening area refers to the equivalent adjustable cross-sectional area of the inlet of the sampling pipeline (formed by adjusting through the electromagnetic valve), which is used to adjust the flow into the pipeline.

[0124] The principle of fluid continuity refers to the conservation of the mass flow rate of the gas at any cross section of the system under steady-state flow conditions.

[0125] The pressure difference distribution relationship refers to the total negative pressure ΔP pump of the sampling pump under the rated working condition.

[0126] According to the orifice flow relationship, the distribution relationship between the opening area and the flow of the sampling gas is determined as where C d is the flow coefficient (obtained by calibration, typically 0.65-0.85), ρ is the density of the measured gas, A i represents the opening area of the inlet of the i-th sampling pipeline. The density of the measured gas can be obtained by a gas density sensor.

[0127] Step S505: According to the distribution relationship and the available pressure difference, the optimal opening area set that satisfies the actual sampling flow of the sampling pipeline equal to the target sampling flow is solved.

[0128] According to the distribution relationship, the target sampling flow Q0 is substituted into, and the optimal opening area satisfying the target sampling flow is solved: The opening areas of all sampling pipelines are solved in sequence to obtain the optimal opening area set {A1, A2, A3, …, A n}.

[0129] Step S506: Adjust the opening areas of the air inlets of the sampling pipelines according to the optimal opening area set.

[0130] After obtaining the optimal opening area set, the electromagnetic valves at the air inlets of the sampling pipelines are adjusted according to the corresponding opening areas in the optimal opening area set.

[0131] In the following embodiments, if gas leakage occurs in a certain detection room and the amount of gas leakage is relatively large, in order to prevent further diffusion of the leaked gas, the present embodiment provides a leaked gas collection method, referring to Figure 8 , the method comprises: Step S601: Determine whether the VOCs component concentration of the sampling gas is greater than a first preset collection gas concentration.

[0132] The first preset collection gas concentration is a preset constant, which can be adjusted according to actual needs. The first preset collection gas concentration is greater than a preset safety concentration threshold.

[0133] When the VOCs component concentration is greater than the first preset collection gas concentration, it indicates that the sampling pipeline corresponding to the VOCs component concentration has generated a large amount of leaked gas during detection sampling. Therefore, the leaked gas is collected while the leakage alarm is issued. When the VOCs component concentration is not greater than the first preset collection gas concentration, the leakage alarm is issued and the sampling gas is not collected.

[0134] Step S602: If yes, mark the sampling pipeline corresponding to the VOCs component concentration greater than the preset collection gas concentration as a collection pipeline.

[0135] The VOCs component concentration can be obtained by performing a multi-point detection step to obtain a VOCs component concentration sequence corresponding to a plurality of sampling pipelines. Since the VOCs component concentration sequence includes the sampling pipeline number, the VOCs component concentration greater than the preset collection gas concentration is filtered out from the VOCs component concentration sequence, the sampling pipeline number corresponding to the VOCs component concentration is queried, and the sampling pipeline corresponding to the sampling pipeline number is marked as a collection pipeline.

[0136] Step S603: Close all sampling pipelines except the collection pipeline.

[0137] The electromagnetic valve provided at the inlet of the sampling pipeline is closed by the sample gas inlet unit, and the electromagnetic valve corresponding to the collection pipeline is not included.

[0138] Step S604: Increase the power of the sampling pump and collect the sampling gas in the collection pipeline.

[0139] Since the sampling pipelines other than the collection pipeline are closed, the negative pressure output acting on the collection pipeline increases when the sampling pump is working at the default power, so that the absorption capacity of the collection pipeline for gas is enhanced. Further, by increasing the power of the sampling pump, the negative pressure output acting on the collection pipeline is further increased to further enhance the absorption capacity for gas.

[0140] The embodiment of the present application provides a method for cooperatively collecting gas, referring to Figure 9 The method comprises: Step S701: Determine whether the VOCs component concentration of the sampling gas is greater than a second preset collection gas concentration, wherein the second preset collection gas concentration is greater than a first preset collection gas concentration.

[0141] The second preset collection gas concentration is a preset constant, which can be adjusted according to actual needs. The second preset collection gas concentration is greater than the first preset collection gas concentration.

[0142] When the VOCs component concentration is greater than the second preset collection gas concentration, the degree of collecting the sampled gas through the collection pipeline cannot meet the collection requirement at this time, so the sampling can be synchronously collected through the adjacent pipeline, and a higher specification of leakage alarm is issued.

[0143] Step S702: If greater, determine whether the VOCs component of the adjacent pipeline adjacent to the collection pipeline and the VOCs component of the collection pipeline produce a target chemical reaction after mixing.

[0144] In another aspect, if the VOCs component concentration of the sampling gas is not greater than the second preset collection gas concentration, the steps in the embodiment are referred to Figure 8 for execution.

[0145] The adjacent pipeline refers to the sampling pipeline adjacent to the collection pipeline.

[0146] The target chemical reaction refers to a chemical reaction that may be triggered after mixing two or more VOCs component gases, including but not limited to: oxidation reaction (such as olefin and ozone, aldehyde and oxidizing agent reaction); exothermic or explosive reaction (such as hydrocarbon and nitrate, ketone and peroxide reaction); Polymerization reaction or corrosive product formation (e.g. acrylonitrile reacting with acid gases).

[0147] The server is pre-stored with a VOCs component compatibility database, which is used to store a reaction relationship table and a reaction risk level between different VOCs components.

[0148] In a feasible embodiment, the main VOCs component detected by the collection pipeline is ethylene (C2H4), and the VOCs component of the adjacent pipeline (a4) is ozone (O3). The server queries in the VOCs component compatibility database that ethylene and ozone have oxidation reaction characteristics at normal temperature and pressure, and the reaction equation is: C2H4+O3→CH2O+CH2O2 The reaction is an exothermic reaction and may produce peroxide with strong oxidizing properties. Step S703: If yes, determine the target adjacent pipeline in the adjacent pipeline, wherein the target adjacent pipeline refers to the pipeline in which the VOCs component in the adjacent pipeline and the VOCs component in the collection pipeline produce a target chemical reaction after mixing.

[0149] The VOCs component in the adjacent pipeline and the VOCs component in the collection pipeline are screened from the adjacent pipelines of the collection pipeline to produce a target chemical reaction after mixing, and the pipeline is selected as the target adjacent pipeline.

[0150] Step S704: Increase the power of the sampling pump and close the target adjacent pipeline.

[0151] By closing the target adjacent pipeline, the gas absorbed from the target adjacent pipeline and the gas absorbed by the collection pipeline are prevented from having a target chemical reaction at the sample gas inlet unit. By increasing the power of the sampling pump, the negative pressure output acting on the collection pipeline is increased to improve the gas collection capability of the corresponding detection sampling of the collection pipeline.

[0152] Step S705: If no, keep all adjacent pipelines in an open state.

[0153] If no, it means that the VOCs components of the gas absorbed through the adjacent pipeline and the VOCs components of the gas absorbed by the collection pipeline do not produce a target chemical reaction after mixing. Therefore, by keeping all adjacent pipelines in an open state, the collection range of the corresponding detection area of the collection pipeline is improved to reduce the probability of diffusion of the leaked gas.

[0154] Based on the same inventive concept, the embodiments of the present application provide a multi-point VOCs leakage detection system, comprising: An acquisition module is configured to acquire item type information and VOCs component concentration. A memory is configured to store the program of the multi-point VOCs leakage detection method. a processor, a program in the memory can be loaded and executed by the processor to implement the multi-point VOCs leakage detection method.

[0155] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above functional modules is exemplified, and in actual application, the above functions can be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device and unit described above can refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

[0156] The embodiment of the present application provides a computer readable storage medium, which stores a computer program capable of being loaded and executed by a processor to implement a multi-point VOCs leakage detection method.

[0157] The computer storage medium includes, for example, a U disk, a mobile hard disk, a read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0158] Based on the same inventive concept, the embodiment of the present application provides an intelligent terminal, which comprises a memory and a processor, and the memory stores a computer program capable of being loaded and executed by the processor to implement a multi-point VOCs leakage detection method.

[0159] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above functional modules is exemplified, and in actual application, the above functions can be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device and unit described above can refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

[0160] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Any feature disclosed in the specification (including the abstract and drawings) can be replaced by other equivalent or similar features, unless specifically stated. That is, each feature is only an example of a series of equivalent or similar features.

Claims

1. A multi-point VOCs leak detection method, characterized in that, The method comprises the following steps: acquiring the type information of the articles in the detection area; collecting the sample gas in the detection area through the sampling pipeline corresponding to the detection area, and conveying the sample gas to the detection host; detecting the concentration of the sample gas by the detection host to obtain the concentration of the volatile organic compounds (VOCs); judging whether there is leakage gas in the detection area according to the type information of the articles in the detection area and the concentration of the VOCs; if there is, generating a leakage alarm information and issuing a leakage alarm according to the leakage alarm information.

2. The method of claim 1, wherein, There are several detection rooms, each of which is provided with an air detection pipeline. The method further comprises the following steps: synchronously sampling through the air detection pipelines to obtain a mixed air sample; judging whether there is leakage gas in the mixed air sample; if yes, detecting the detection room according to a preset detection method; if no, performing a multi-point detection step according to a preset sampling period, wherein the multi-point detection step refers to the steps of collecting the sample gas in the detection area through the sampling pipelines in the detection room in sequence, and detecting the concentration of the sample gas through the detection host in sequence to obtain a VOCs concentration sequence; judging whether there is leakage gas according to the VOCs concentration sequence; in the case where there is leakage gas, confirming the target detection area with leakage gas according to the VOCs concentration sequence.

3. The method of claim 2, wherein, The detection of the detection room according to the preset detection method comprises the following steps: collecting the air sample of the detection room through the air detection pipeline in sequence, and detecting the concentration of the air sample through the sampling host in sequence to obtain an air sample concentration sequence; confirming the target detection room with leakage gas according to the sample air sequence; performing the multi-point detection step in the target detection room to obtain the target detection area with leakage gas.

4. The method of claim 3, wherein, The method further comprises the following steps: judging whether there is a deviated detection area with a VOCs concentration not matching the type information of the articles in the target detection area; if yes, acquiring the current ventilation direction in the detection room; judging whether the deviated detection area is located in the downwind area of the target detection area along the current ventilation direction; if not, issuing a leakage substance transfer alarm; if yes, changing the current ventilation direction to a target ventilation direction opposite in direction; judging whether the position of the deviated detection area has changed; if yes, determining that the leakage gas in the target detection area has transferred to the deviated detection area; if no, determining that the leakage substance in the target detection area has transferred to the deviated detection area, and issuing a leakage substance transfer alarm.

5. The method of claim 1, wherein, The method further comprises the following steps: calculating the equivalent flow resistance in the sampling pipeline according to the pipeline length and the pipeline inner diameter of the sampling pipeline; determining the target sampling flow rate of each sampling pipeline according to the rated air pumping flow rate of the sampling pump; determining the available pressure difference of the air inlet of each sampling pipeline according to the rated air pumping flow rate and the equivalent flow resistance; establishing a distribution relationship between the opening area of the air inlet of the sampling pipeline and the sampling gas flow rate based on the fluid continuity principle and the pressure difference distribution relationship; solving the optimal opening area set satisfying the actual sampling flow rate of the sampling pipeline equal to the target sampling flow rate according to the distribution relationship and the available pressure difference; adjusting the opening area of the air inlet of each sampling pipeline according to the optimal opening area set.

6. The method of claim 2, wherein, The method further comprises: determining whether the VOCs component concentration of the sampling gas is greater than a first preset collection gas concentration; if yes, marking the sampling pipeline with the VOCs component concentration greater than the preset collection gas concentration as a collection pipeline; closing all sampling pipelines except the collection pipeline; increasing the power of the sampling pump and collecting the sampling gas in the collection pipeline.

7. The method of claim 6, wherein, The method further comprises: determining whether the VOCs component concentration of the sampling gas is greater than a second preset collection gas concentration, wherein the second preset collection gas concentration is greater than the first preset collection gas concentration; if yes, determining whether the VOCs component of a neighboring pipeline adjacent to the collection pipeline and the VOCs component of the collection pipeline produce a target chemical reaction after mixing; if yes, determining a target neighboring pipeline in the neighboring pipelines, wherein the target neighboring pipeline refers to the pipeline in which the VOCs component of the neighboring pipeline and the VOCs component of the collection pipeline produce a target chemical reaction after mixing; increasing the power of the sampling pump and closing the target neighboring pipeline; if no, keeping all neighboring pipelines in an open state.

8. A multi-point VOCs leak detection system, characterized in that, The system is used to execute the multi-point VOCs leakage detection method according to any one of claims 1 to 7, comprising: an acquisition module configured to acquire the item type information and the VOCs component concentration; a memory configured to store the program of the multi-point VOCs leakage detection method; a processor, the program in the memory can be loaded and executed by the processor, and the multi-point VOCs leakage detection method is implemented.

9. A smart terminal, characterized by The system comprises a memory and a processor, and the memory stores a computer program capable of being loaded and executed by the processor to execute the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The system stores a computer program capable of being loaded and executed by the processor to execute the method according to any one of claims 1 to 7.

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