A method and system for tracing the source of unorganized waste gas emissions

Abstract

The present invention discloses a method and system for tracing the source of unorganized waste gas emissions, and relates to the field of tracing the source of unorganized waste gas emissions. The method includes: obtaining environmental parameters collected by unorganized waste gas environmental monitoring equipment arranged according to a coarse grid at a set frequency; determining the rough area where the source of unorganized waste gas emissions is located according to the environmental parameters; obtaining the second waste gas concentration collected by the leakage sensor arranged according to a fine grid in the rough area within a second set time period; and determining the point where the source of unorganized waste gas emissions is located according to the second waste gas concentration. The present invention uses the double-precision gridding technology of coarse grids and fine grids to first lock the rough area, and then analyze the concentration values ​​collected by the wireless leakage sensors arranged in a fine grid in the area, and sort the contribution values ​​of the leakage point according to the concentration values ​​collected by different wireless leakage sensors, thereby achieving accurate tracking of the source of unorganized waste gas.

Description

Technical Field

[0001] The present invention relates to the field of unorganized waste gas emission source tracing, and in particular to a method and system for tracing the source of unorganized waste gas emissions. Background Art

[0002] In recent years, the state has gradually tightened its supervision of unorganized waste gas emissions and has also promulgated a number of unorganized waste gas emission control standards. For example, the Volatile Organic Compounds Unorganized Emission Control Standard (GB37822-2019), the "Technical Guidelines for Leak Detection and Repair of Industrial Enterprises" (HJ 1230-2021) and the Yangtze River Delta Integration Standard "Technical Specifications for Emission Control of Volatile Organic Compounds from Equipment Leakage". In the above standards, higher control requirements are put forward for the concentration of environmental pollutants caused by unorganized waste gas emissions. In addition, unorganized waste gas emissions are also one of the main causes of complaints about environmental odor and odor pollution accidents.

[0003] However, it is difficult to trace and track the source of unorganized waste gas emissions. In particular, for some factory boundary waste gas concentration exceeding the standard or some odor complaints, there are instantaneous emissions and exceeding the standard, not continuous exceeding the standard. As a result, when relevant personnel receive the alarm and rush to the scene, they cannot restore the scene at that time and find the source of the unorganized emissions.

[0004] In order to solve the source problem of unorganized waste gas emissions, many related technologies have also been published. For example, the invention patent "An automatic monitoring, early warning and tracing system for VOCs in the atmosphere of industrial areas and its method" with application publication number CN106841436A proposes to identify pollution sources through data from several automatic monitoring stations and combined with physical diffusion and probability statistics tracing models; the invention patent "A risk source identification and tracing method based on risk identification and its system" with application publication number CN109737309A proposes to realize the source identification and leakage tracing analysis of gas leakage data through the deployment of pipeline gas leakage equipment and combined with the gas leakage diffusion model. However, the above methods are all very dependent on the model, and the accuracy of the model is closely related to the matching degree between the on-site environment and the modeling. The industrial environment on site is complex, and there are a large number of buildings, equipment and devices, which will affect the accuracy of the model, thereby leading to the accuracy of tracing. Summary of the invention

[0005] The purpose of the present invention is to provide a method and system for tracing the source of unorganized waste gas emissions, which can achieve accurate tracking of the source of unorganized waste gas emissions.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A method for tracing the source of unorganized waste gas emissions, the method comprising:

[0008] Obtaining environmental parameters collected by the unorganized exhaust gas environment monitoring equipment arranged according to the coarse grid according to the set frequency; the environmental parameters include the first exhaust gas concentration, wind speed and wind direction;

[0009] Determine the rough area where the source of unorganized waste gas emission is located based on the environmental parameters;

[0010] Acquire a second exhaust gas concentration collected by the leakage sensors arranged in a fine grid in the coarse area within a second set time period;

[0011] Based on the second exhaust gas concentration, determine the location of the source of unorganized exhaust gas emissions.

[0012] Optionally, determining the rough area where the source of the unorganized waste gas emission is located according to the environmental parameters specifically includes:

[0013] When the concentration of the first exhaust gas reaches a set alarm value, determining the corresponding unorganized exhaust gas environment monitoring equipment;

[0014] Obtain the wind direction and wind speed within a first set time period collected by the corresponding unorganized exhaust gas environment monitoring device;

[0015] Determining the direction of the first source according to the wind direction within the first set time period;

[0016] Determine the distance between the first source and the corresponding unorganized exhaust gas environment monitoring device according to the wind speed within the first set time period;

[0017] According to the direction of the first source and the distance, the rough area where the source of the unorganized waste gas emission is located is determined.

[0018] Optionally, determining the location of the source of the unorganized waste gas emission according to the second waste gas concentration specifically includes:

[0019] Sort the second exhaust gas concentrations from high to low to determine a leakage point contribution list;

[0020] Determining a corresponding leakage sensor according to the leakage point contribution list;

[0021] According to the setting position of the corresponding leakage sensor, the location of the source of the unorganized waste gas emission is determined.

[0022] A fugitive waste gas emission source tracing system is applied to the above-mentioned fugitive waste gas emission source tracing method, and the system comprises:

[0023] Unorganized waste gas environmental monitoring equipment is set up at the factory boundary and on the roads inside the factory according to a coarse grid to obtain environmental parameters;

[0024] Leakage sensors are arranged at important risk points of fugitive emissions in the factory according to a fine grid, and are used to obtain the second exhaust gas concentration; the important risk points of fugitive emissions include dynamic and static sealing points of equipment pipelines and key points of the process;

[0025] The cloud platform is connected to the unorganized waste gas environmental monitoring equipment and the leakage sensor respectively, and is used to obtain the environmental parameters and the second waste gas concentration, and determine the location of the unorganized waste gas emission source according to the environmental parameters and the second waste gas concentration, and display the location through a 3D digital factory.

[0026] Optionally, the distance between the unorganized exhaust gas environment monitoring equipment is not greater than 200 meters.

[0027] Optionally, the leakage sensor communicates with the cloud platform using NB-IoT or LORA.

[0028] Optionally, the unorganized exhaust gas environment monitoring device is an environment monitoring micro station, and a wind speed and direction meteorological instrument is provided on the top of the environment monitoring micro station.

[0029] Optionally, the unorganized exhaust gas environment monitoring equipment communicates with the cloud platform using 4G or 5G.

[0030] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0031] The present invention provides a method for tracing the source of unorganized exhaust gas emissions, including: obtaining environmental parameters collected by unorganized exhaust gas environmental monitoring equipment arranged according to a coarse grid at a set frequency; the environmental parameters include a first exhaust gas concentration, wind speed and wind direction; determining the rough area where the source of the unorganized exhaust gas emissions is located according to the environmental parameters; obtaining the second exhaust gas concentration collected by the leakage sensor arranged according to a fine grid in the rough area within a second set time period; and determining the point where the source of the unorganized exhaust gas emissions is located according to the second exhaust gas concentration. The present invention uses the dual-precision gridding technology of coarse grids and fine grids to first lock the rough area, and then analyze the concentration values ​​collected by the wireless leakage sensors arranged in a fine grid in the area, and sort the contribution values ​​of the leakage point according to the concentration values ​​collected by different wireless leakage sensors, thereby achieving accurate tracking of the source of unorganized exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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 will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0033] Figure 1 A flow chart of the method for tracing the source of unorganized waste gas emissions provided by the present invention;

[0034] Figure 2 A flowchart of the algorithm steps of a specific embodiment provided by the present invention;

[0035] Figure 3 A module diagram of the unorganized waste gas emission source tracking system provided by the present invention;

[0036] Figure 4 A schematic diagram of the equipment arrangement of the coarse grid and the fine grid provided by the present invention;

[0037] Figure 5 This is a schematic diagram of the system architecture provided by the present invention.

[0038] Explanation of symbols:

[0039] 1-Unorganized waste gas environmental monitoring equipment, 2-Leakage sensor, 3-Cloud platform. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0041] The purpose of the present invention is to provide a method and system for tracing the source of unorganized waste gas emissions, which can achieve accurate tracking of the source of unorganized waste gas emissions.

[0042] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0043] Embodiment 1

[0044] like Figure 1 and Figure 2 As shown, the present invention provides a method for tracing the source of unorganized waste gas emissions, the method comprising:

[0045] Step S1: Obtain environmental parameters collected by the unorganized exhaust gas environment monitoring equipment arranged according to a coarse grid at a set frequency; the environmental parameters include a first exhaust gas concentration, wind speed and wind direction.

[0046] Step S2: Determine the rough area where the source of unorganized waste gas emissions is located based on the environmental parameters.

[0047] Specifically, when the first exhaust gas concentration reaches the set alarm value, the corresponding unorganized exhaust gas environment monitoring device is determined, and the wind direction and wind speed collected by the corresponding unorganized exhaust gas environment monitoring device within the first set time period are obtained; the direction of the first source is determined according to the wind direction within the first set time period; the distance between the first source and the corresponding unorganized exhaust gas environment monitoring device is determined according to the wind speed within the first set time period. According to the direction and distance of the first source, the rough area where the unorganized exhaust gas emission source is located is determined.

[0048] Step S3: obtaining a second exhaust gas concentration collected by the leakage sensors arranged in a fine grid within the coarse area within a second set time period.

[0049] Step S4: Determine the location of the source of the unorganized waste gas emission based on the second waste gas concentration.

[0050] Specifically, the second exhaust gas concentration is sorted from high to low to determine a leakage point contribution list; based on the leakage point contribution list, the corresponding leakage sensor is determined; based on the setting position of the corresponding leakage sensor, the location of the source of the unorganized exhaust gas emission is determined.

[0051] Embodiment 2

[0052] In order to execute the method corresponding to the above embodiment 1 to achieve the corresponding functions and technical effects, a fugitive exhaust emission source tracking system is provided below, such as Figure 3 and Figure 4 As shown, the system comprises:

[0053] The unorganized waste gas environment monitoring equipment 1 is set up at the factory boundary and the roads inside the factory according to the coarse grid to obtain environmental parameters. Specifically, the unorganized waste gas environment monitoring equipment 1 is an environmental monitoring micro station, and a wind speed and direction meteorological instrument is set on the top of the environmental monitoring micro station. The spacing between the unorganized waste gas environment monitoring equipment 1 set up according to the coarse grid is not more than 200 meters.

[0054] Leakage sensor 2 is set at important risk points of unorganized emissions in the factory according to a fine grid, and is used to obtain the second exhaust gas concentration; the important risk points of unorganized emissions include dynamic and static sealing points of equipment pipelines and key points of the process.

[0055] The cloud platform 3 is connected to the unorganized waste gas environment monitoring device 1 and the leakage sensor 2, respectively, for obtaining the environmental parameters and the second waste gas concentration, and determining the location of the unorganized waste gas emission source according to the environmental parameters and the second waste gas concentration, and displaying the location through a 3D digital factory. The unorganized waste gas environment monitoring device 1 communicates with the cloud platform 3 using 4G or 5G. The leakage sensor 2 communicates with the cloud platform using NB-IoT or LORA.

[0056] Figure 5 Figure 1 is a schematic diagram of the system architecture. Figure 5 As mentioned above, the bottom layer, which is also the data collection layer, is the unorganized exhaust gas environment monitoring equipment and wireless leakage sensors, which communicate with the platform by wireless communication. Among them, the wireless leakage sensor adopts NB-IoT or LORA, and the unorganized exhaust gas environment monitoring equipment is recommended to use 4G or 5G communication. They each upload the on-site concentration data at a regular frequency. When the concentration of the unorganized exhaust gas environment monitoring equipment exceeds the standard abnormally, the algorithm engine layer will confirm the final location of the unorganized exhaust gas leakage according to the previously set judgment rules. The visualization application layer makes a visual display of the unorganized exhaust gas source tracking to help users find the leakage point more intuitively.

[0057] The working process of the unorganized waste gas emission source tracking system provided by the present invention is as follows:

[0058] The fugitive exhaust gas environment monitoring equipment is arranged around the factory boundary and internal roads, with an interval of no more than 200 meters. The distance can be closer in appropriately complex areas. The fugitive exhaust gas environment monitoring equipment can be arranged on the factory boundary roads and internal roads as nodes of the coarse grid; the accuracy of the detection unit selected by the equipment is at least 10% of the environmental standard limit of fugitive emissions, and the detection resolution and lower limit are at least 1% of the environmental standard limit of fugitive emissions. For example, the environmental standard limit is 4mg / m 3 , the accuracy should be 0.4mg / m 3 The detection limit should not be higher than 0.04 mg / m 3 In this way, a coarse-grid unorganized waste gas environment monitoring system is formed, and the accuracy can meet the relevant standards of environmental monitoring and can provide early warning.

[0059] In addition to monitoring the designated exhaust gas, the unorganized exhaust gas environment monitoring equipment has a wind speed and wind direction meteorological parameter meter installed on the top, which can monitor the wind speed and wind direction at the point in real time. In addition, the data of the unorganized exhaust gas environment monitoring equipment has the function of wireless data transmission, and the data is transmitted to the cloud platform at a set frequency, for example, 10 minutes / time. When the concentration reaches the set alarm value, the current data and the average data of the previous 10 minutes will be reported immediately.

[0060] The important potential risk points of the factory's unorganized emissions are evaluated, mainly 1) dynamic and static sealing points of equipment pipelines, including: valves, flanges, pumps, compressors, open valves or open pipelines, pressure relief equipment, etc.; 2) key points of the process, including material delivery, loading and unloading ports, reaction device feed and discharge ports, exhaust gas collection ports, etc. The potential risk points are comprehensively evaluated according to the contribution of unorganized emissions and the probability of occurrence, and the most representative potential points are selected. The factory arranges manual inspections of all points on a regular basis, and the unorganized emissions of each point are recorded. Through statistics, the size of unorganized emissions can be known, and thus the contribution of unorganized emissions can be known. In addition, the probability of occurrence can be obtained by two methods. The first method: through the method of manual detection, the data accumulated over a long period of time can know the probability of occurrence. The second method: different types of sealing points have theoretical and scientific leakage probabilities. For example, the contribution of fugitive emissions and the probability of occurrence are comprehensively evaluated by dividing the probability of occurrence by the contribution of fugitive emissions, and the most representative potential points are selected. Potential risk points accounting for about 1% of the total fugitive emission points are called key supervision points for fugitive waste gas emissions, which are the most representative potential points.

[0061] Wireless leakage sensors are installed at the key monitoring points of this 1% of unorganized exhaust gas emissions. The wireless leakage sensor serves as a node of the fine grid; the wireless leakage sensor adopts battery-powered technology and the equipment is explosion-proof equipment. The frequency of wireless upload of the wireless leakage sensor is 1h / time, and the average concentration within this 1h is uploaded each time. The alarm threshold is also set, and it will be reported immediately when it exceeds this value. The alarm threshold can refer to the provisions of the standard-Volatile Organic Compound Unorganized Emission Control Standard (GB37822-2019). For example, the leakage concentration threshold of VOCs gas can be 500μmol / mol. Therefore, the above-mentioned wireless leakage sensors constitute a set of fine-grid unorganized exhaust gas leakage detection system. The detection error of the wireless leakage sensor is not more than 10% of the leakage concentration threshold, for example, 50μmol / mol; the detection resolution and lower limit are at least 1% of the leakage concentration alarm threshold, for example, 5μmol / mol.

[0062] When a coarse-grid unorganized exhaust gas environmental monitoring device exceeds the standard and sends alarm data to the cloud platform, the cloud platform will retrieve the average wind speed, direction and concentration data within the previous 5 minutes, taking into account the lag of diffusion. Determine the approximate source based on the direction, and roughly determine the distance to the source based on the wind speed, and lock the rough area; for example, if the wind direction is easterly and the average wind speed is 3m / s, then the source can be judged to be on the east side of the detection device point based on the wind direction to the east, and the wind speed is 3m / s, then the distance can be roughly determined. According to the direction and distance of the source, a rough area can be locked. When a device at a coarse grid node alarms, the approximate source direction and area of ​​the pollutants can be determined based on the meteorological equipment on the device.

[0063] In the locked area, analyze the concentration values ​​of the wireless leakage sensors arranged in fine grids in the area in the past hour. According to the sorting of concentration values, lock the specific unorganized emission points. The results are visualized on the cloud platform. Considering that the concentration of unorganized exhaust gas environmental monitoring equipment in the coarse grid environment is composed of the concentration of each leakage point in multiple fine grids diffused to the location, the excessive concentration of unorganized exhaust gas in the environment is generally caused by multiple leakage points, and the system can sort the contribution value of the leakage point in this period, that is, the average concentration of the leakage point in this period, solving the problem that the previous leakage tracing model can only trace the source of a single point.

[0064] Taking the source tracing of unorganized VOCs waste gas of a chemical enterprise as an example, the specific application of the unorganized waste gas emission source tracing system is as follows:

[0065] Chemical companies have a large amount of VOCs unorganized waste gas emissions, which are mainly concentrated in the sealing points of equipment, such as valves, flanges, pumps, etc., as well as the import and export locations of materials.

[0066] The area of ​​the chemical enterprise is 600 meters long and 400 meters wide. A total of 10 VOCs environmental monitoring microstations are installed at intervals of 200 meters at the factory boundary of the chemical enterprise, and 8 VOCs environmental monitoring microstations are also installed at the intersections of the factory roads, forming a coarse grid distribution with a total of 18 nodes. A wind speed and direction meteorological instrument is installed on the top of the VOCs environmental monitoring microstation. The VOCs environmental monitoring microstation adopts the PID sensor principle, with a range of 20ppm and a detection resolution of 0.01ppm. 4G wireless communication is adopted. An instantaneous data is sent to the platform every 10 minutes. If the concentration exceeds the limit value (set here as 2ppm), it will be uploaded immediately.

[0067] VOCs wireless leakage sensors are installed in each device area. The principle is nano-semiconductor sensors. The range is 2000ppm and the accuracy is 5ppm. NB-IoT wireless communication is adopted. One time-averaged data is sent to the platform every 1h. If the concentration exceeds the limit value (here set to 200ppm), a data is uploaded immediately.

[0068] Based on the double-precision gridding unorganized waste gas source tracking technology, a set of unorganized waste gas source tracking platform was established. The platform includes data collection layer, data storage layer, algorithm layer and application layer. Among them, the application layer of the platform is designed as a 3D digital factory display, which can directly locate the specific valve or pipe flange or other related equipment points according to the tracking results.

[0069] The method for tracing the source of unorganized waste gas emissions provided by the present invention can also be described as a dual-precision grid monitoring technology for unorganized waste gas, which has the following technical effects:

[0070] (1) The present invention does not rely on the source tracing diffusion model algorithm, and solves the inaccuracy problem caused by the inconsistency between the traditional source tracing diffusion model and reality.

[0071] (2) Since the present invention does not rely on a large amount of computing power, it solves the problems of slow analysis speed and low efficiency of tracing.

[0072] (3) The result of tracing the source of unorganized exhaust gas in the traditional tracing diffusion model is a single point. The present invention can trace the source to multiple points, solving the problem that the traditional tracing diffusion model can generally only trace the source to a single point, and can also sort the possibilities.

[0073] (4) The node equipment of the fine grid arrangement of the present invention can accurately determine the specific leakage location, while the traditional tracing diffusion model method only tells an area and cannot accurately determine the location of the leakage.

[0074] (5) The node monitoring equipment used in the fine grid and the coarse grid of the present invention has different accuracy and range, which reduces the hardware cost of deployment and reduces the investment of enterprises.

[0075] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0076] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for tracing the source of unorganized waste gas emissions. It is characterized in that The method comprises: Obtaining environmental parameters collected by the unorganized exhaust gas environment monitoring equipment arranged according to the coarse grid according to the set frequency; the environmental parameters include the first exhaust gas concentration, wind speed and wind direction; Determine the rough area where the source of unorganized waste gas emissions is located based on the environmental parameters, including: When the concentration of the first exhaust gas reaches a set alarm value, determining the corresponding unorganized exhaust gas environment monitoring equipment; Obtain the wind direction and wind speed within a first set time period collected by the corresponding unorganized exhaust gas environment monitoring device; Determining the direction of the first source according to the wind direction within the first set time period; Determine the distance between the first source and the corresponding unorganized exhaust gas environment monitoring device according to the wind speed within the first set time period; Determine a rough area where the source of the unorganized waste gas emission is located according to the direction of the first source and the distance; Acquire a second exhaust gas concentration collected by the leakage sensors arranged in a fine grid in the coarse area within a second set time period; According to the second exhaust gas concentration, the location of the source of unorganized exhaust gas emission is determined, specifically including: Sort the second exhaust gas concentrations from high to low to determine a leakage point contribution list; Determining a corresponding leakage sensor according to the leakage point contribution list; Determine the location of the source of the unorganized exhaust gas emission according to the setting position of the corresponding leakage sensor; The contribution of fugitive emissions and the probability of occurrence are comprehensively evaluated by the probability of occurrence * contribution of fugitive emissions, and the top 1% of potential risk points are selected as key monitoring points for fugitive exhaust gas emissions, and the leakage sensors are installed.

2. A fugitive waste gas emission source tracing system, applied to the fugitive waste gas emission source tracing method according to claim 1, It is characterized in that The system comprises: Unorganized waste gas environmental monitoring equipment is set up at the factory boundary and on the roads inside the factory according to a coarse grid to obtain environmental parameters; Leakage sensors are arranged at important risk points of fugitive emissions in the factory according to a fine grid, and are used to obtain the second exhaust gas concentration; the important risk points of fugitive emissions include dynamic and static sealing points of equipment pipelines and key points of the process; The cloud platform is connected to the unorganized waste gas environmental monitoring equipment and the leakage sensor respectively, and is used to obtain the environmental parameters and the second waste gas concentration, and determine the location of the unorganized waste gas emission source according to the environmental parameters and the second waste gas concentration, and display the location through a 3D digital factory.

3. The fugitive waste gas emission source tracking system according to claim 2, It is characterized in that The distance between the unorganized waste gas environment monitoring equipment is not more than 200 meters.

4. The fugitive waste gas emission source tracking system according to claim 2, It is characterized in that The leakage sensor communicates with the cloud platform using NB-IoT or LORA.

5. The fugitive waste gas emission source tracking system according to claim 2, It is characterized in that The unorganized waste gas environment monitoring equipment is an environment monitoring micro station, and a wind speed and direction meteorological instrument is arranged on the top of the environment monitoring micro station.

6. The fugitive waste gas emission source tracking system according to claim 2, It is characterized in that The unorganized exhaust gas environment monitoring equipment communicates with the cloud platform using 4G or 5G.

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