VOCs cluster monitoring system based on PID and PTR-MS

Abstract

The invention relates to volatile organic compound monitoring, and in particular to a VOCs cluster monitoring system based on the combination of PID and PTR-MS, comprising a distributed PID monitoring device, a PTR-MS monitoring device, a PTR-MS cruise monitoring platform, a cluster monitoring platform for the combination of PID and PTR-MS, and a cruise device for carrying the PID monitoring device and the PTR-MS monitoring device. The PID monitoring device comprises a controller, a particle dust sensor, a PID sensor, a positioning module and a data transmission module. Detection signals of the particle dust sensor and the PID sensor are respectively converted into digital signals by a first analog-to-digital conversion module and a second analog-to-digital conversion module and then sent to the controller. The technical solution provided by the invention can effectively overcome the defects of the prior art that real-time continuous online monitoring is impossible and the time and space coverage is low.

Description

Technical Field

[0001] The invention relates to volatile organic compound monitoring, and in particular to a VOCs cluster monitoring system based on the combination of PID and PTR-MS. Background Art

[0002] Volatile organic compounds (VOCs) are the main characteristic air pollutants in industrial parks and the main precursors of ozone and particulate matter. Their toxicity can directly damage human health and they are currently the focus of air pollution reduction in my country.

[0003] Atmospheric volatile organic compounds refer to organic compounds that participate in atmospheric photochemical reactions, including non-methane hydrocarbons (alkanes, alkenes, alkynes, aromatic hydrocarbons, etc.), oxygen-containing organic matter (aldehydes, ketones, alcohols, ethers, etc.), chlorine-containing organic matter, nitrogen-containing organic matter, sulfur-containing organic matter, etc., which are important precursors to the formation of ozone and fine particulate matter (PM2.5) pollution. In recent years, through national control, as well as the strengthening of corporate environmental protection efforts and the improvement of public environmental awareness, the precursors of ozone and fine particulate matter, including SO2, nitrogen oxides NO x , smoke and dust have been well controlled, but VOCs emissions are still on the rise, and their impact on the atmospheric environment is becoming increasingly prominent. In key areas such as the Beijing-Tianjin-Hebei region and its surrounding areas, and the Yangtze River Delta, ozone has even become the primary influencing factor, and VOCs are key precursors of ozone and secondary aerosols, and are also closely related to PM2.5 pollution.

[0004] Environmental governance starts with monitoring. Volatile organic compounds participate in a series of complex photochemical reactions in the atmosphere and are important precursors of ozone. However, volatile organic compounds have a wide range of sources and complex compositions. Existing VOCs volatile organic compound monitoring technologies mainly include sensor technology, chromatography / mass spectrometry technology, selective ion transfer mass spectrometry technology, and spectroscopy technology. Based on these technologies, a number of representative instruments have been developed: online VOCs monitors, portable Fourier infrared instruments, and fixed pollution source waste VOCs continuous monitoring systems.

[0005] Most of the existing VOCs monitoring systems are expensive, have poor data real-time performance, low measurement width, and short service life. Therefore, it is necessary to innovate the VOCs monitoring system and develop a comprehensive and efficient VOCs monitoring system. By integrating existing monitoring technologies, matching existing technologies with monitoring needs, improving the quality assurance and quality control level of VOCs monitoring and the level of online monitoring informationization of volatile organic compounds, we can provide technical support for my country's environmental supervision and the formulation of prevention and control measures.

[0006] The principle of photo-ionization detector (PID) is that the gas to be measured is ionized into ions by ultraviolet light, and the ions are offset under the action of external electric field to form a weak current, which is converted into a voltage signal output. The voltage is linearly related to the concentration of the gas to be measured. The PID method of monitoring volatile organic compounds is significantly better than online chromatography and online mass spectrometry in terms of time resolution, and has the advantages of small size, low cost and large number of points, which has great advantages in atmospheric grid monitoring.

[0007] However, PID sensors are different from other conventional gaseous pollutant sensors (such as sulfur dioxide and ozone). PID sensors do not monitor a single substance, but need to respond to one or more types of pollutants (such as aromatic hydrocarbons and alkanes) to achieve real-time monitoring of volatile organic compound pollution emissions in industrial parks, early warning, and changing patterns. Many industrial parks have installed and used PID sensors for grid monitoring, with huge investments, but the results are not ideal. The main problems are low accuracy, large errors, strong environmental impact, and many interference factors.

[0008] PTR-MS cruise monitoring of volatile organic compounds refers to the use of vehicle-mounted rapid mass spectrometry technology to investigate the spatiotemporal distribution and trends of volatile organic compounds within a certain area, and simultaneously identify potential emission sources. Compared with online monitoring at fixed sites, cruise monitoring has strong mobility and can quickly grasp the dynamic spatial distribution of VOCs and their pollution characteristics. It is an important technical means to track and trace the impact of emission sources on ambient air. It is also a technical means to supplement the lack of data support for management needs in the automatic monitoring technology of ambient air fixed stations and the online monitoring technology of pollution sources. However, this method has problems such as high cost of use and inability to maintain long-term online monitoring.

[0009] Therefore, strengthening the research and development of volatile organic compound monitoring technology, especially the research on the combination of PID equipment and mass spectrometry, is urgently needed in the current environmental monitoring field. Summary of the invention

[0010] 1. Technical issues to be resolved

[0011] In view of the above-mentioned shortcomings of the prior art, the present invention provides a VOCs cluster monitoring system based on the combination of PID and PTR-MS, which can effectively overcome the defects of the prior art that it cannot carry out real-time continuous online monitoring and has low temporal and spatial coverage.

[0012] (II) Technical solution

[0013] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0014] VOCs cluster monitoring system based on PID and PTR-MS, including distributed PID monitoring equipment, PTR-MS monitoring equipment, PTR-MS cruise monitoring platform, PID and PTR-MS combined cluster monitoring platform, and cruise equipment for carrying PID monitoring equipment and PTR-MS monitoring equipment;

[0015] The PID monitoring device includes a controller, a particle dust sensor, a PID sensor, a positioning module and a data transmission module. The detection signals of the particle dust sensor and the PID sensor are respectively converted into digital signals by a first analog-to-digital conversion module and a second analog-to-digital conversion module and then sent to the controller. The controller sends the detection data to a cluster monitoring platform for PID and PTR-MS through the data transmission module.

[0016] The PTR-MS monitoring equipment includes a sampling system, an ion source, a reaction flow tube and an ion detection system, and has a built-in instrument background automatic acquisition module, a VOCs concentration real-time inversion module, a pollution source automatic matching module, a GPS information acquisition module, a VOCs emission standard comparison display module and a remote map display module. The PTR-MS monitoring equipment sends the detection data to the PTR-MS cruise monitoring platform and the cluster monitoring platform for the combination of PID and PTR-MS.

[0017] Preferably, the navigating device regularly approaches each PID monitoring device, and performs online calibration on the PID monitoring device through information interaction similar to that of an ant colony.

[0018] Preferably, the PID monitoring device is arranged at a fixed point, or is mounted on a taxi, a bus, a drone and a UAV, and the PTR-MS monitoring device is mounted on a UAV.

[0019] Preferably, a chemical ionization mass spectrometer is installed and connected inside the UAV through a shock-absorbing base, and the chemical ionization mass spectrometer is connected to an external sampling head installed on the roof of the UAV through an in-vehicle sampling tube, and the chemical ionization mass spectrometer is connected to one end of an exhaust pipe, and the other end of the exhaust pipe is led out from the rear of the UAV, and the chemical ionization mass spectrometer is connected to a controller, and the controller is connected to a positioning module and a data transmission module.

[0020] Preferably, the traveling vehicle is also provided with an uninterruptible power supply connected to the chemical ionization mass spectrometer, and an extended battery pack connected to the uninterruptible power supply.

[0021] Preferably, the controller transmits a set of detection data every three seconds, and the detection data includes a timestamp, spatial GPS coordinate information and VOCs concentration data.

[0022] Preferably, the PTR-MS cruise monitoring platform includes a detection result display module, a function display module, a VOCs concentration trend graph display module and a substance concentration distribution status display module;

[0023] The detection result display module displays the PTR-MS monitoring equipment's cruise detection results on the map in the form of a color bar chart, and displays the corresponding place names and street names;

[0024] Function display module, supports up / down / left / right view switching, rotation and translation, and can change the viewing angle at will through the mouse;

[0025] VOCs concentration trend chart display module, which displays the detection time and detection concentration at the mouse position, displays the substance concentration ranking list at the mouse click, and displays the cruise detection results and concentration trend chart of the selected specific substance;

[0026] The substance concentration distribution status display module displays the pie chart of each substance concentration distribution status and the percentage of each substance concentration, and displays the detection location and detection time.

[0027] Preferably, the cluster monitoring platform for the combination of PID and PTR-MS includes a data calibration module, a real-time display module, a road pollution cloud map generation module, a road pollution ranking generation module, a regional pollution ranking generation module, an automatic pollution alarm module and an automatic fault identification alarm module;

[0028] Data calibration module, through a perfect data calibration mechanism, the remote calibration platform performs test data calibration;

[0029] Real-time display module, which displays the current test data in real time, including the test location, vehicle information list, equipment serial number and VOCs concentration data;

[0030] A road pollution cloud map generation module generates a road pollution cloud map according to the detection data and the time span;

[0031] The road pollution ranking generation module provides identification and statistical results of pollution points on all road sections in the main urban area according to the detection data and time span;

[0032] The regional pollution ranking generation module provides VOCs concentration rankings for streets, districts, counties, and towns according to the time span based on the detection data, and also provides a list of VOCs concentration improvement rates for streets, districts, counties, and towns;

[0033] Automatic pollution alarm module, which displays the details of the alarm event, including the location of the alarm event, alarm time, event type, VOCs concentration and event status, and provides alarm reminders in a prominent position on the system platform;

[0034] The automatic fault identification and alarm module can timely identify the fault records of the faulty equipment and send an alarm to the system platform, and at the same time correct the fault data of the faulty equipment.

[0035] Preferably, each point on the road pollution cloud map includes VOCs concentration data, average vehicle speed and detection location.

[0036] Preferably, the road pollution ranking generation module can find out the most polluted and cleanest sections in the main urban area, list the streets, districts and counties to which each section belongs, and display the section name, ranking, pollution value and location on a map.

[0037] (III) Beneficial effects

[0038] Compared with the prior art, the VOCs cluster monitoring system based on the combination of PID and PTR-MS provided by the present invention has the following beneficial effects:

[0039] 1) Real-time continuous online monitoring, using the principle of combining photoionization and mass spectrometry detection to achieve information-based monitoring of volatile organic compound concentrations, breaking the lag of traditional monitoring methods and the defect of being unable to fully reflect the trend of volatile organic compound concentration changes;

[0040] 2) Save monitoring costs. VOCs volatile organic compound monitoring instruments sold on the market, especially imported instruments, are relatively expensive. PID monitoring equipment can be carried on public transportation vehicles, which greatly reduces the investment in manpower and material resources. This system has a low overall cost and high cost performance, which can meet the needs of most monitoring sites and effectively reduce monitoring costs;

[0041] 3) Full coverage: Taking advantage of the low cost and easy installation of PID monitoring equipment, PID monitoring equipment can be set at fixed points, mobile vehicles or drones to achieve all-round monitoring of VOCs in the detection area;

[0042] 4) Innovative monitoring methods and technologies. This system fully considers the difficulties and pain points of current volatile organic compound monitoring, and realizes efficient and rapid three-dimensional monitoring of VCOs, which is valuable for in-depth research, industrialization and promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0044] Figure 1 It is a schematic diagram of the system of the present invention;

[0045] Figure 2 It is a structural schematic diagram of the traveling vehicle in the present invention;

[0046] Figure 3 It is the working principle diagram of the PID monitoring device in the present invention;

[0047] Figure 4 It is a working principle diagram of the PTR-MS monitoring device in the present invention. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] VOCs cluster monitoring system based on PID and PTR-MS, such as Figures 1 to 4 As shown, it includes distributed PID monitoring equipment, PTR-MS monitoring equipment, PTR-MS cruise monitoring platform, PID and PTR-MS combined cluster monitoring platform, and cruise equipment for carrying PID monitoring equipment and PTR-MS monitoring equipment.

[0050] In the technical solution of this application, the navigating device regularly approaches each PID monitoring device and performs online calibration on the PID monitoring device through information interaction similar to that of an ant colony, thereby improving the accuracy of the PID monitoring data and ensuring that the PID monitoring data is reliable and available.

[0051] like Figure 3 As shown, the PID monitoring equipment includes a controller, a particle dust sensor, a PID sensor, a positioning module and a data transmission module. The detection signals of the particle dust sensor and the PID sensor are respectively converted into digital signals by the first analog-to-digital conversion module and the second analog-to-digital conversion module and then sent to the controller. The controller sends the detection data to the cluster monitoring platform for PID and PTR-MS through the data transmission module.

[0052] The controller transmits a set of detection data every three seconds, which includes timestamp, spatial GPS coordinate information and VOCs concentration data.

[0053] like Figure 4As shown, the PTR-MS monitoring equipment includes a sampling system, an ion source, a reaction flow tube and an ion detection system, and has built-in instrument background automatic acquisition module, VOCs concentration real-time inversion module, pollution source automatic matching module, GPS information acquisition module, VOCs emission standard comparison display module and remote map display module. The PTR-MS monitoring equipment sends the detection data to the PTR-MS cruise monitoring platform and the cluster monitoring platform for the combination of PID and PTR-MS.

[0054] like Figure 1 As shown, the PID monitoring equipment is set at a fixed point, or carried on a taxi, a bus, a drone (mainly used to carry the PID monitoring equipment for regional modeling analysis) and a UAV 1, and the PTR-MS monitoring equipment is carried on the UAV 1.

[0055] like Figure 2 As shown, a chemical ionization mass spectrometer 2 is installed and connected inside the UAV 1 through a shock-absorbing base 3, and the chemical ionization mass spectrometer 2 is connected to an external sampling head 4 installed on the roof of the UAV 1 through an in-vehicle sampling tube 5. The chemical ionization mass spectrometer 2 is connected to one end of an exhaust pipe 7, and the other end of the exhaust pipe 7 is led out from the rear of the UAV 1. The chemical ionization mass spectrometer 2 is connected to a controller 10, and the controller 10 is connected to a positioning module 6 and a data transmission module.

[0056] An uninterruptible power supply 9 connected to the chemical ionization mass spectrometer 2 and an extended battery pack 8 connected to the uninterruptible power supply 9 are also provided inside the traveling vehicle 1 .

[0057] The PTR-MS cruise monitoring platform includes detection result display module, function display module, VOCs concentration trend graph display module and substance concentration distribution status display module;

[0058] The detection result display module displays the PTR-MS monitoring equipment's cruise detection results on the map in the form of a color bar chart, and displays the corresponding place names and street names;

[0059] Function display module, supports up / down / left / right view switching, rotation and translation, and can change the viewing angle at will through the mouse;

[0060] The VOCs concentration trend chart display module displays the detection time and detection concentration at the mouse position, displays the substance concentration ranking list at the mouse click (the concentration ranking list shows the concentration of the top ten substances), and displays the cruise detection results and concentration trend chart of the selected specific substance;

[0061] The substance concentration distribution status display module displays the pie chart of each substance concentration distribution status and the percentage of each substance concentration, and displays the detection location and detection time.

[0062] The cluster monitoring platform for PID and PTR-MS includes a data calibration module, a real-time display module, a road pollution cloud map generation module, a road pollution ranking generation module, a regional pollution ranking generation module, an automatic pollution alarm module, and an automatic fault identification alarm module;

[0063] Data calibration module, through a perfect data calibration mechanism, the remote calibration platform performs test data calibration;

[0064] Real-time display module, which displays the current test data in real time, including the test location, vehicle information list, equipment serial number and VOCs concentration data;

[0065] The road pollution cloud map generation module generates a road pollution cloud map based on the detection data and the time span (hour, day, week, ten-day period, month, etc.). Each point on the road pollution cloud map includes VOCs concentration data, average vehicle speed and detection location;

[0066] The road pollution ranking generation module provides identification and statistical results of pollution points on all road sections in the main urban area according to the detection data and time span (hour, day, week, ten days, month, etc.);

[0067] The regional pollution ranking generation module provides VOCs concentration rankings for streets, districts, counties, and towns according to the time span (hour, day, week, ten-day period, month, etc.) based on the detection data (click on the ranking list to locate the area on the map, and mark the selected area according to the concentration value), and also provides a list of VOCs concentration improvement rates for streets, districts, counties, and towns;

[0068] The automatic pollution alarm module displays the details of the alarm event, including the location of the alarm event, alarm time, event type, VOCs concentration and event status (click on the alarm event to display the details), and also provides an alarm reminder in a prominent position on the system platform;

[0069] The automatic fault identification and alarm module can timely identify the fault records of the faulty equipment and send an alarm to the system platform, and at the same time correct the fault data of the faulty equipment.

[0070] Among them, the road pollution ranking generation module can find the 50 most polluted sections and the 50 cleanest sections in the main urban area, list the streets, districts and counties to which each section belongs, and display the section name, ranking, pollution value and location on the map. Click on the ranking list to quickly locate the section and circle it.

[0071] The technical solution of this application combines a photoionization gas sensor (PID) and a proton transfer reaction mass spectrometer (PTR-MS) to build a regional networked VOCs real-time online monitoring and analysis platform, so as to grasp the overall situation of VOCs emissions in the region in real time, carry out precise source tracing analysis and investigation in a timely manner for high-value areas, determine the emission points and VOCs emission components, improve the monitoring efficiency and level of VOCs, and improve the regional air pollution prevention and control system.

[0072] In the technical solution of this application, the overall workflow of the system includes:

[0073] (1) Build a volatile organic compound PID monitoring network. For areas with monitoring needs, choose to deploy PID monitoring equipment at fixed points, mobile vehicles or drones to achieve real-time monitoring of VOCs in the detection area;

[0074] (2) Use PTR-MS monitoring equipment to regularly calibrate the PID monitoring equipment online. By having the UAV regularly approach each PID monitoring equipment, information interaction similar to that of an ant colony can be achieved, thereby achieving online calibration of the PID monitoring equipment, improving the accuracy of the PID monitoring data and ensuring that the PID monitoring data is reliable and available.

[0075] (3) The PID monitoring equipment collects test data online and sends it to the monitoring platform. The PID monitoring equipment is used to quickly read the ambient VOCs concentration data, remotely control the monitoring instrument, and realize remote transmission of data, which is then presented on the monitoring platform.

[0076] (4) The cluster monitoring platform that combines PID and PTR-MS guides the navigation vehicle to accurately trace the source. Multiple PID monitoring devices are used to map high-value points, and the system automatically generates a mass spectrometry navigation route, thereby achieving accurate tracing of the most prominent problem points;

[0077] (5) The cluster monitoring platform combined with PID and PTR-MS is used for big data analysis. Based on the analysis of massive VOCs concentration big data, a regional VOCs pollution model is established to understand the VOCs emission patterns in the region and identify key VOCs pollution areas.

[0078] The technical solution of this application integrates the PID monitoring method for volatile organic compounds and the PTR-MS cruise monitoring method, and utilizes the complementary principles of photoionization and mass spectrometry detection to establish a VOCs cluster monitoring system that is efficient, accurate, and has higher temporal and spatial coverage, thereby realizing real-time online monitoring of VOCs concentrations and comprehensively reflecting the changing trends of volatile organic compound concentrations.

[0079] The VOCs cluster monitoring system based on the combination of PID and PTR-MS adopts VOCs real-time online comprehensive monitoring technology, which shortens the sampling and preprocessing time, improves the temporal and spatial resolution of VOCs monitoring, and can obtain continuous massive monitoring data. Through the system's core algorithm and analysis platform, it can quickly and accurately obtain the VOCs analysis results required in the monitoring area so that corresponding measures can be taken in time.

[0080] This system can be widely used in continuous online monitoring of VOCs in urban ambient air and various industrial park air. It can overcome the limitations of existing monitoring systems and greatly improve monitoring efficiency in early warning monitoring, pollution source tracing monitoring and emergency detection of sudden environmental events. The promotion and application of this system can directly provide technical support for the refined control of atmospheric VOCs and precise environmental law enforcement.

[0081] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. VOCs cluster monitoring system based on PID and PTR-MS, characterized by: Including distributed PID monitoring equipment, PTR-MS monitoring equipment, PTR-MS cruise monitoring platform, PID and PTR-MS combined cluster monitoring platform, and cruise equipment for carrying PID monitoring equipment and PTR-MS monitoring equipment; The PID monitoring device includes a controller, a particle dust sensor, a PID sensor, a positioning module and a data transmission module. The detection signals of the particle dust sensor and the PID sensor are respectively converted into digital signals by a first analog-to-digital conversion module and a second analog-to-digital conversion module and then sent to the controller. The controller sends the detection data to a cluster monitoring platform for PID and PTR-MS through the data transmission module. The PTR-MS monitoring device includes a sampling system, an ion source, a reaction flow tube and an ion detection system, and has a built-in instrument background automatic acquisition module, a VOCs concentration real-time inversion module, a pollution source automatic matching module, a GPS information acquisition module, a VOCs emission standard comparison display module and a remote map display module. The PTR-MS monitoring device sends the detection data to the PTR-MS cruise monitoring platform and the cluster monitoring platform for PID and PTR-MS; The cluster monitoring platform for PID and PTR-MS includes a data calibration module, a real-time display module, a road pollution cloud map generation module, a road pollution ranking generation module, a regional pollution ranking generation module, an automatic pollution alarm module and an automatic fault identification alarm module; Data calibration module, through a perfect data calibration mechanism, the remote calibration platform performs test data calibration; Real-time display module, which displays the current test data in real time, including the test location, vehicle information list, equipment serial number and VOCs concentration data; A road pollution cloud map generation module generates a road pollution cloud map according to the detection data and the time span; The road pollution ranking generation module provides identification and statistical results of pollution points on all road sections in the main urban area according to the detection data and time span; The regional pollution ranking generation module provides VOCs concentration rankings for streets, districts, counties, and towns according to the time span based on the detection data, and also provides a list of VOCs concentration improvement rates for streets, districts, counties, and towns; Automatic pollution alarm module, which displays the details of the alarm event, including the location of the alarm event, alarm time, event type, VOCs concentration and event status, and provides alarm reminders in a prominent position on the system platform; The automatic fault identification and alarm module can timely identify the fault records of the faulty equipment and send an alarm to the system platform, and at the same time correct the fault data of the faulty equipment.

2. The VOCs cluster monitoring system based on PID and PTR-MS combination according to claim 1 is characterized by: The navigating device regularly approaches each PID monitoring device and performs online calibration on the PID monitoring device through information interaction similar to that of an ant colony.

3. The VOCs cluster monitoring system based on PID and PTR-MS combination according to claim 2 is characterized by: The PID monitoring device is arranged at a fixed point, or is mounted on a taxi, a bus, a drone and a UAV (1), and the PTR-MS monitoring device is mounted on the UAV (1).

4. The VOCs cluster monitoring system based on PID and PTR-MS combination according to claim 3 is characterized by: A chemical ionization mass spectrometer (2) is installed and connected inside the traveling vehicle (1) via a shock-absorbing base (3); the chemical ionization mass spectrometer (2) is connected to an external sampling head (4) installed on the roof of the traveling vehicle (1) via an internal sampling tube (5); the chemical ionization mass spectrometer (2) is connected to one end of an exhaust pipe (7); the other end of the exhaust pipe (7) is led out from the rear of the traveling vehicle (1); the chemical ionization mass spectrometer (2) is connected to a controller (10); and the controller (10) is connected to a positioning module (6) and a data transmission module.

5. The VOCs cluster monitoring system based on PID and PTR-MS combination according to claim 4 is characterized in that: The traveling vehicle (1) is also provided with an uninterruptible power supply (9) connected to the chemical ionization mass spectrometer (2), and an extended battery pack (8) connected to the uninterruptible power supply (9).

6. The VOCs cluster monitoring system based on PID and PTR-MS combination according to claim 2 is characterized by: The controller transmits a set of detection data every three seconds, and the detection data includes a timestamp, spatial GPS coordinate information and VOCs concentration data.

7. The VOCs cluster monitoring system based on PID and PTR-MS combination according to claim 1 is characterized by: The PTR-MS cruise monitoring platform includes a detection result display module, a function display module, a VOCs concentration trend graph display module and a substance concentration distribution status display module; The detection result display module displays the PTR-MS monitoring equipment's cruise detection results on the map in the form of a color bar chart, and displays the corresponding place names and street names; Function display module, supports up / down / left / right view switching, rotation and translation, and can change the viewing angle at will through the mouse; VOCs concentration trend chart display module, which displays the detection time and detection concentration at the mouse position, displays the substance concentration ranking list at the mouse click, and displays the cruise detection results and concentration trend chart of the selected specific substance; The substance concentration distribution status display module displays the pie chart of each substance concentration distribution status and the percentage of each substance concentration, and displays the detection location and detection time.

8. The VOCs cluster monitoring system based on PID and PTR-MS combination according to claim 1 is characterized by: Each point on the road pollution cloud map includes VOCs concentration data, average vehicle speed and detection location.

9. The VOCs cluster monitoring system based on PID and PTR-MS combination according to claim 1 is characterized by: The road pollution ranking generation module can find out the most polluted and cleanest sections in the main urban area, list the streets, districts and counties to which each section belongs, and display the section name, ranking, pollution value and location on a map.

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