A VOCs source analysis and early warning method

Abstract

The application discloses a VOCs source analysis and early warning method, and aims at the special scene that in a closed or semi-closed environment, there are multiple VOCs sources which can produce same or different types of VOCs in different time periods. The influence of the diffusion speed of different types of VOCs on the accuracy and sensitivity of VOCs source analysis and early warning is considered. The period concentration site floating diagram is constructed, the step height is set for VOCs concentration detection, and according to the concentration exceeding standard situation of each type of VOCs at the secondary height, the horizontal position of the VOCs detection equipment set at the primary height is adaptively adjusted in each data collection period. The balance between the accuracy of VOCs source analysis and the sensitivity of early warning is found.

Description

Technical Field

[0001] This invention relates to the field of data analysis technology, specifically to a method for VOCs source analysis and early warning. Background Technology

[0002] In my country, VOCs (volatile organic compounds) refer to organic compounds with a saturated vapor pressure greater than 70 Pa at room temperature and a boiling point below 260℃ at normal pressure, or all organic compounds with a vapor pressure greater than or equal to 10 Pa at 20℃ that are volatile. Most VOCs have an unpleasant odor and are toxic, irritating, teratogenic, and carcinogenic. In particular, benzene, toluene, and formaldehyde can cause great harm to human health.

[0003] In special scenarios where there are multiple VOC sources that can generate the same or different types of VOCs at different times, whether in enclosed or semi-enclosed environments, the key technical problem to be solved is how to quickly and accurately locate the source of a specific type of VOC at a certain point in time or during a certain period. This is crucial for the accurate analysis and early warning of designated VOC sources in each plant that can generate multiple types of VOCs at the same or different times, to prevent the concentration of the corresponding type of VOC from exceeding the standard, and to ensure the health of workers.

[0004] Currently, the analysis and early warning of VOCs sources in factories mainly adopt the following two existing methods:

[0005] The first method involves deploying several VOCs concentration detection devices in the upper space inside the factory building. These devices collect VOCs concentration data at preset intervals and then determine whether the concentration of each type of VOCs exceeds the standard, triggering an alarm if it does. However, this approach focuses on detecting VOCs in the overall factory space and cannot accurately pinpoint the specific source of a particular VOC exceeding the standard within the factory at each time interval, as required by the specific scenario described above. In short, this method employs a "one-to-many" VOCs detection scheme, where one VOCs concentration detection device detects the concentration of various types of VOCs at multiple VOCs sources. However, this "one-to-many" VOCs concentration detection scheme also has the following problems:

[0006] Since each VOCs source may produce multiple types of VOCs gas, even if the VOCs gas produced at different locations are of the same type, the diffusion range of VOCs varies due to the different distances between the VOCs sources and the detection sites, resulting in different spatial concentration differences of VOCs and different diffusion speeds and times to the detection sites. In this case, when a certain type of VOCs concentration exceeds the standard at a certain time point, how to determine which VOCs source is most likely to cause the excessive concentration of that type of VOCs? That is, under the conditions of "one-to-many" detection site deployment and the scenario where the same or different types of VOCs have different diffusion speeds at the same or different sites, how to achieve accurate positioning of the VOCs source causing the excessive concentration becomes the second technical problem that the first existing solution mentioned above needs to solve.

[0007] The second existing solution involves deploying dedicated VOCs concentration detection devices one-to-one above each location within the factory where VOCs are likely to be generated. When an excessive concentration of a particular type of VOC is detected, an alarm is triggered. Based on the binding relationship between the deployed VOCs concentration detection devices and the VOCs generation source, the source of the excessive VOCs can be quickly located. However, this solution also has the following technical problems:

[0008] The "one-to-one" setup of VOCs concentration detection equipment fails to consider the impact of different types of VOCs, or the varying diffusion rates of the same type of VOCs under different spatial concentration differences, on the accuracy of detection results. This leads to overly sensitive warnings or even false alarms, causing inconvenience to normal operations. Furthermore, factories that easily generate VOCs typically have ventilation equipment installed on rooftops and other areas. Assuming that a certain type of harmful VOC can reduce its concentration to a safe level within one minute through its own diffusion capacity and the assistance of ventilation equipment, it is considered unnecessary to trigger an alarm for exceeding the concentration limit under this condition. However, different types of VOCs typically have different diffusion rates. How to avoid such unnecessary alarms for exceeding the concentration limit becomes a further technical problem that the second existing solution mentioned above needs to address. Summary of the Invention

[0009] This invention provides a VOCs source analysis and early warning method. Specifically, it addresses the unique scenario of multiple VOCs sources in closed or semi-closed environments at different times, capable of generating the same or different types of VOCs. The method considers the impact of different VOCs diffusion rates on the accuracy and sensitivity of VOCs source analysis and early warning. By constructing a periodic concentration site fluctuation map, setting stepped heights for VOCs concentration detection, and adaptively adjusting the horizontal position of the VOCs detection device at the primary height within each data acquisition cycle based on the concentration exceedance of various VOCs at the secondary height, a balance is struck between ensuring the accuracy of VOCs source analysis and the sensitivity of early warning.

[0010] To achieve this objective, the present invention adopts the following technical solution:

[0011] Provide a method for VOCs source analysis and early warning, the steps of which include:

[0012] S1 receives VOCs source analysis and early warning instructions;

[0013] S2, extract the top 'a' points from the periodic concentration site fluctuation map associated with the specified time period. And obtain the time t2 of each k+1 period within the specified time period at each point. Concentration of each VOCs gas i collected at the site

[0014] S3, calculate the average gas concentration of each VOCs gas i during the specified time period. A represents the number of the top a's;

[0015] S4, determine whether at least one of the VOCs gas i is present. Exceeding the standard

[0016] If so, then according to the calculation And are non-zero values The corresponding site Level 1 height Obtain the height of each of the first-level heights Associated secondary heights Proceed to step S5;

[0017] If not, return to step S1 and wait to receive the VOCs source analysis warning instruction again;

[0018] S5, obtain the secondary heights obtained in step S4 at time t1 of each period k in the specified time period by the detection device. The VOCs gas types collected at the site are determined, and it is determined whether type i is included.

[0019] If so, then corresponding sites Add to the list of locations to be flagged for alarm purposes;

[0020] If not, then not The corresponding site Add to the list of locations to be flagged for alarm;

[0021] S6, based on pre-constructed sites -The binding relationship between the VOCs gas generating device and the grid g where the VOCs generating device is located is matched to identify the VOCs generating device bound to each location in the list of potential alarm locations and the grid g corresponding to the matched VOCs generating device, and an alarm is triggered.

[0022] Preferably, the periodic concentration site floating map associated with the specified time period is constructed using the following method steps:

[0023] L1, at time t1 of each k-cycle in the specified time period, acquire the VOCs gas generating device in each grid g at the secondary height. The corresponding site The concentrations of each of the VOCs gases i collected at the site

[0024] L2, in each In the process, the gas concentrations with the highest concentration u are extracted to form a gas concentration set.

[0025] L3, judgment Does the concentration of each gas exceed its corresponding concentration threshold?

[0026] If so, then proceed to time t1 of period k+1 to process the grid g containing the first-level height. site The process of adjusting the setting position, after which the position adjustment is completed, yields the location. At the first level of the k+1 cycle Then proceed to step L4, the site Also updated to site

[0027] If not, then maintain the site for period k+1. The setting position is the same as the setting position in the k-cycle;

[0028] L4, at time t2 of each period of the specified time period, from the point where the position adjustment is completed. The concentration of each VOCs gas i was collected at the site. and form sites -Grid g-Time t2 of period k+1-Collected concentrations The binding relationship is determined, and then this binding relationship is used as the binding point. The t2 time of each period and the grid g are respectively the horizontal and vertical coordinates of the binding point in the XY axis coordinate system. The binding points are then plotted in the XY axis coordinate system to form the periodic concentration site floating map.

[0029] Preferably, in step L3, the position is dynamically adjusted at time t1 of period k+1. The location method includes the following steps:

[0030] L31, obtain the first-level height of the grid g at time t2 within the specified time period k. The concentrations of the top VOCs gases detected at u

[0031] L32, obtain the secondary height on the grid g at time t1 within period k+1 of the specified time period. Concentration of each VOC gas i detected at the location And extract the concentrations of VOCs gas of the same type as the top u obtained in step L31. Each VOCs-generating site b in the grid g has a corresponding secondary height.

[0032] L33, For each type of VOCs gas u obtained in steps L31-L32, calculate the concentration difference.

[0033] L34, according to Calculate the diffusion factor u for each type of VOC gas;

[0034] L35, based on the calculated diffusion factor, the site is located within a preset time range after time t1 in period k+1. The horizontal position is adjusted to the site.

[0035] Preferably, in step L34, the diffusion factor of each type of VOC gas u is calculated using the following formula (1):

[0036]

[0037] In formula (1), The diffusion factor represents the diffusion factor of VOCs gas of type u generated in grid g at time t1 of period k+1;

[0038] U indicates to proceed The number of VOCs gas types calculated.

[0039] As a preferred option, the site The horizontal position is adjusted to the site. The method includes the following steps:

[0040] L351, identify the concentrations obtained in step L32 that participate in the concentration difference calculation in step L33. The corresponding VOCs gas generation site O u As a site The basis for adjusting the horizontal position;

[0041] L352, horizontally move the site And calculate the moved site O S With each O u distance

[0042] L353, calculate each of the distances Distance ratio

[0043] L354, determine each of the aforementioned distance ratios Does it satisfy the corresponding diffusion factor? proportional relationship,

[0044] If so, then the site O S The site after horizontal position adjustment And terminate the position adjustment process;

[0045] If not, proceed to step L355;

[0046] L355, determine whether the preset allowable time for position movement has been reached.

[0047] If so, then via the aforementioned site O S Move back to Location;

[0048] If not, return to step L352 and continue moving the site horizontally.

[0049] Preferably, in step L353, the distance ratio is calculated using the following formula (2).

[0050]

[0051] Preferably, the distance ratio mentioned in step L354 Satisfying the corresponding diffusion factor The proportional relationship is:

[0052] judge Whether it falls into The corresponding factor value range,

[0053] If so, then determine and Satisfy the proportional relationship;

[0054] If not, then determine and The proportional relationship is not satisfied.

[0055] This invention addresses the unique scenario of multiple VOCs sources that generate the same or different types of VOCs gases at different times in enclosed or semi-enclosed environments. It considers the impact of the diffusion rate of different types of VOCs on the accuracy and sensitivity of VOCs source analysis and early warning. By constructing a periodic concentration site fluctuation map, setting stepped heights for VOCs concentration detection, and adaptively adjusting the horizontal position of the VOCs detection equipment set at the primary height in each data acquisition cycle based on the concentration exceedance of each type of VOC at the secondary height, a balance is found between ensuring the accuracy of VOCs source analysis and the sensitivity of early warning. Attached Figure Description

[0056] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments of the present invention will be briefly described below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0057] Figure 1 This is a diagram illustrating the implementation steps of a VOCs source analysis and early warning method according to an embodiment of the present invention;

[0058] Figure 2 This is a schematic diagram of the VOCs concentration collection cycle within a specified time period;

[0059] Figure 3 It is a schematic diagram of dividing the interior space of the factory into several grids;

[0060] Figure 4 This is an example diagram of a periodic concentration site fluctuation chart associated with a specified time period;

[0061] Figure 5 This is an example diagram showing the horizontal position adjustment of the first-level height set above each grid g. Detailed Implementation

[0062] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0063] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0064] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0065] In the description of this invention, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating a connection between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0066] This invention provides a method for VOCs source analysis and early warning, such as... Figure 1 As shown, it includes the following steps:

[0067] S1 receives VOCs source analysis and early warning instructions;

[0068] S2, extract the top 'a' points from the periodic concentration locus fluctuation map associated with the specified time period, ranked by quantity (from most to least). And obtain the position of time t2 in each k+1 period within the specified time period. Concentration of each VOCs gas i collected at the site k = 1, 2, ..., K, where K represents the number of data collection cycles within the specified time period;

[0069] Figure 2An exemplary diagram illustrates a cycle for VOCs concentration data collection during a specified time period from 9:00 AM to 10:00 AM. Each cycle k within this specified time period has two VOCs concentration data collection points, t1 and t2. The detection sites for VOCs concentration data collection are set at a height including a single level. and Level 2 height To accurately pinpoint the VOCs source sites causing excessive VOC concentrations, the factory's floor plan is divided into sections as follows: Figure 3 The diagram shows several grids g. VOCs generating devices (VOCs sources) are placed in grids g. Grid g may not contain any VOCs generating devices, or it may contain several VOCs generating devices that produce at least one type of VOCs gas, for example... Figure 3 As shown, site 11 in the seventh grid produces VOCs gas H, site 2 produces VOCs gas B, site 12 in the sixteenth grid produces VOCs gases B and H, and site 7 produces VOCs gas F. The installation height (secondary height) of the VOCs concentration detection device above each site b in each grid is shown. The concentration of VOCs generated at site b is related to the diffusion rate of the VOCs gas. Different types of VOCs typically have different diffusion rates. Therefore, VOCs concentration detection devices placed above different sites b that generate different types of VOCs usually have different placement heights. This placement height refers to the secondary height associated with the site generating the VOCs gas. It should be noted here that each VOC-generating site b is associated with a corresponding secondary height. This secondary height is related to the diffusion rate of VOCs gas generated at the corresponding site b. For example, if the diffusion rate of VOCs gas A at site 1 is s1 and the diffusion rate of VOCs gas B at site 2 is s2, then the secondary height corresponding to site 1 is h1, and the secondary height corresponding to site 2 is h2. The specific values ​​of h1 and h2 are not within the scope of the claims of this invention, therefore, the specific setting of the secondary height associated with each site b will not be detailed here. To simplify the VOCs source analysis and early warning process, in this embodiment, the secondary height associated with each site b is fixed. However, in the specific scenario described in the background art, Figure 3Different sites b within different grids may generate different types of VOCs gases during different data acquisition cycles at different specified time periods. Since different sites within the plant typically have different VOCs gas concentration differences at different times, these different types of VOCs gases have different diffusion rates at different times. To ensure the accuracy of VOCs concentration detection at the secondary height, ideally, the secondary height associated with each site b should be adaptively adjusted according to different diffusion rates. However, adjusting the secondary height requires each VOCs concentration detection device at the secondary height to have a height adjustment function, which undoubtedly increases the construction cost of the VOCs source analysis and early warning system. Furthermore, secondary height adjustment requires adjustment time, which needs to be adapted to the data acquisition time points in the data acquisition cycle. However, since the adjustment amount for the secondary height of each site b is usually different, the adjustment time also varies, making it difficult to achieve uniform adaptation to the data acquisition time points in the data acquisition cycle. Considering the above, in this embodiment, the secondary height of each site b is set to a fixed height.

[0070] Periodic site concentration fluctuation graph as shown Figure 4 As shown, with Figure 2 The time t2 of each period and each grid g shown are the x-axis and y-axis coordinates in the XY-axis coordinate system, respectively. Using the binding points as the plotting objects, the binding points are plotted in the XY-axis coordinate system to form a periodic concentration site floating map. The binding points plotted in the periodic concentration site floating map are obtained through the following steps:

[0071] L1, in such Figure 2 At time t1 of each k-cycle of the specified time period, the VOCs gas generating device in each grid g is obtained at a secondary height. corresponding site Concentration of each VOCs gas i collected at the site

[0072] L2, in each In the process, the gas concentrations with the highest concentration u are extracted to form a gas concentration set.

[0073] L3, judgment Does the concentration of each gas exceed its corresponding concentration threshold?

[0074] If so, then proceed to time t1 of period k+1 to process the grid g with first-order height. site The process of setting and adjusting the position is completed to obtain the site. At the first level of the k+1 cycle Then proceed to step L4, site Also updated to site It should be noted here that... This refers to the adjusted position of the corresponding site at time t1 in period k+1. Within each period k, sites with a first-level height position undergo only one height adjustment. It should be noted that when k=1, the site is positioned above each grid g. Level 1 height The initial height is preferably the last first-level height adjustment made for the grid g in the last cycle of the previous specified time period of the current specified time period, or it is a specified first-level initial height set above the center point of the grid g (the specific setting of the first-level initial height is not explained in detail).

[0075] If not, then maintain the site within period k+1. The setting position is the same as the setting position in the k-cycle;

[0076] L4, in such Figure 2 The point at time t2 of each period of the specified time period shown is the point at which the position adjustment is completed. The concentration of each VOCs gas i was collected at the site. and form sites -Grid g-Time t2 of period k+1-Collected concentrations The binding relationship is established, and then, using this binding relationship as the binding point, and with time t2 of each period and grid g as the x-axis and y-axis coordinates of the binding point in the XY-axis coordinate system, respectively, each binding point is plotted on the XY-axis coordinate system to form a pattern as shown below. Figure 4 The diagram shows the periodic concentration site fluctuations. In step S1, based on this established binding relationship, the top 'a' points in terms of quantity can be quickly obtained. (Each binding point is associated with a site) The concentrations of each VOCs gas i collected at the corresponding first-level altitude.

[0077] The key to ensuring the accuracy of VOCs source location in this invention lies in dynamically adjusting the primary height of the detection device above each grid g in each cycle. This primary height adjustment takes into account the diffusion rates of different types of VOCs from the secondary height, solving the technical problem of error-prone early warnings that fail to consider VOCs diffusion capabilities. Furthermore, by setting separate primary and secondary heights for VOCs concentration detection for each grid, different types of VOCs exhibit different diffusion capabilities at varying concentration differences during VOCs source analysis. By dynamically adjusting the primary height of the detection device, a balance is struck between ensuring accuracy in VOCs source analysis and sensitivity in early warning.

[0078] In step L3 above, the position is dynamically adjusted at time t1 of period k+1. The location method includes the following steps:

[0079] L31, obtain the grid g(t2 at time t2 within the specified time period k periods). Figure 4 In the text, g1, g2, ..., gn represent different grid levels. The concentrations of the top VOCs gases detected at u

[0080] L32, obtains the secondary height of each element on grid g at time t1 within a specified period k+1. (The secondary height is fixed, therefore the secondary height within period k+1 is also the same.) Instead The concentrations of each VOC gas i detected And extract the concentration of VOCs gas of the same type as the top u obtained in step L31. Each VOCs-generating site b in grid g has a corresponding secondary height.

[0081] L33, For each type of VOCs gas u obtained in steps L31-L32, calculate the concentration difference.

[0082] L34, according to Calculate the diffusion factor u for each type of VOC gas;

[0083] L35, based on the calculated diffusion factor, the site is located within a preset time range after time t1 in period k+1. The horizontal position is adjusted to the site.

[0084] In step L34, the diffusion factor is calculated using the following formula (1):

[0085]

[0086] In formula (1), This represents the diffusion factor of VOCs gas of type u generated in grid g at time t1 in period k+1;

[0087] U indicates to proceed The number of VOCs gas types calculated.

[0088] In step L35, the site The horizontal position is adjusted to the site. The method is as follows:

[0089] L351, identify the concentrations obtained in step L32 that participate in the concentration difference calculation in step L33. The corresponding VOCs gas generation site O u As a site The basis for adjusting the horizontal position (which can be based on a pre-constructed site). - Identification of the binding relationship between the VOCs gas generating device (site b) and the grid g containing the VOCs generating device;

[0090] L352, Horizontal Movement Site And calculate the moved site O S With each O u distance

[0091] L353, calculate each distance Distance ratio

[0092] L354, determine the proportion of each distance. Does it satisfy the corresponding diffusion factor? proportional relationship (if) fall into The corresponding factor value range is then determined. and (Satisfying the proportional relationship)

[0093] If so, then site O S As the site after horizontal position adjustment And terminate the position adjustment process;

[0094] If not, proceed to step L355;

[0095] L355, determine whether the preset allowable time for position movement has been reached.

[0096] If so, then via site O S Move back to Location (abandoning position adjustment);

[0097] If not, return to step L352 and continue horizontally moving the site.

[0098] For example, in the method of adjusting the horizontal position of the first-level height, suppose the generation point O in the grid g identified in step L351 is... u include Figure 5The sites 1, 2, and 3 shown have secondary heights h1, h2, and h3, respectively. VOCs concentration detection devices P1, P2, and P3 are installed at these secondary heights h1, h2, and h3, respectively. Assume that P1 detects VOCs gas type A, P2 detects B, and P3 detects C, and the diffusion factors of VOCs gases A, B, and C are c1, c2, and c3, respectively. The primary height associated with grid g is, for example, [missing information]. Figure 5 H in g At time t1 of period k, the VOCs concentration detection device is set at a height of H. g site P g Location. Horizontal movement point P g arrive Figure 5 O in s At this point, the result calculated They are respectively Figure 5 L1, L2, and L3 are shown in the figure. Then, according to the above formula (2), each can be calculated. Finally, when each is determined All fall into the corresponding diffusion factor The corresponding factor value range is then used to determine and The proportional relationship is satisfied, and the position O where the body stays at this time is... s As the site after horizontal position adjustment

[0099] It should be noted here that, as Figure 5 As shown, at P with a first-order height g If the highest concentration of VOCs gases, such as A, B, and C, is detected at point U, then at point P1, which has a secondary altitude, only two VOCs gases, A and B, may be detected. In this case, when calculating the diffusion factor c1, the highest concentration of VOCs gas detected at point P1 is chosen as the basis for calculating the diffusion factor c1.

[0100] After completing step S2, the VOCs source analysis and early warning method provided in this embodiment is as follows: Figure 1 As shown, proceed to the following steps:

[0101] S3, Calculate the average gas concentration of each VOCs gas i during the specified time period. A represents the number of the top a's;

[0102] S4, determine whether there is at least one VOCs gas i Exceeding the standard

[0103] If so, then according to the calculation And are non-zero values corresponding sites Level 1 height Get the height of each level Associated secondary heights Proceed to step S5;

[0104] If not, return to step S1 and wait to receive the VOCs source analysis warning instruction again;

[0105] S5, obtain the secondary altitudes obtained in step S4 at time t1 of each period k of the detection device during the specified time period. The VOCs gas types collected at the site are determined, and it is determined whether type i is included.

[0106] If so, then the corresponding secondary height The associated sites Add to the list of locations to be flagged for alarm purposes;

[0107] If not, then the corresponding secondary height will not be [stated / set]. The associated sites Add to the list of locations to be flagged for alarm purposes;

[0108] S6, based on pre-constructed sites The binding relationship between the VOCs gas generating device and the grid g where the VOCs generating device is located is established. This allows for the matching of the VOCs generating device bound to each location in the list of potential alarm locations with the grid g corresponding to the matched VOCs generating device, and an alarm is triggered. In this way, while balancing the accuracy of VOCs concentration detection and the sensitivity of VOCs concentration exceeding the standard alarm, a relatively accurate location of the VOCs source causing the corresponding type of VOCs gas concentration to exceed the standard is achieved, meeting the application requirements of the special scenario described in the background technology.

[0109] In summary, this invention addresses the unique scenario of multiple VOCs sources that generate the same or different types of VOCs gases at different times in enclosed or semi-enclosed environments. It considers the impact of the diffusion rate of different types of VOCs on the accuracy and sensitivity of VOCs source analysis and early warning. Through techniques such as constructing a periodic concentration site fluctuation map, setting stepped heights for VOCs concentration detection, and adaptively adjusting the horizontal position of the VOCs detection equipment at the primary height within each data acquisition cycle based on the concentration exceedance of various types of VOCs at the secondary height, a balance is struck between ensuring the accuracy of VOCs source analysis and the sensitivity of early warning.

[0110] It should be stated that the above-described specific embodiments are merely preferred embodiments of the present invention and the technical principles employed. Those skilled in the art should understand that various modifications, equivalent substitutions, and variations can be made to the present invention. However, such variations, as long as they do not depart from the spirit of the present invention, should be within the scope of protection of the present invention. Furthermore, some terminology used in this specification and claims is not limiting, but merely for ease of description.

Claims

1. A method for VOCs source analysis and early warning, characterized in that the steps include: include: S1 receives VOCs source analysis and early warning instructions; S2, extract the top 'a' points from the periodic concentration site fluctuation map associated with the specified time period. and obtain each within the specified time period. Periodic Always at your fingertips VOCs gases collected at the site concentration ; S3, calculate each of the VOCs gases Average gas concentration during the specified time period , This indicates the number of items 'a' that rank in the top 'a'. S4, determine whether at least one of the VOCs gases is present. of Exceeding the standard If so, then according to the calculation And are non-zero values The corresponding site Level 1 height Obtain the height of each of the first-level heights. Associated secondary heights Then proceed to step S5; If not, return to step S1 and wait to receive the VOCs source analysis warning instruction again; S5, acquire each cycle of the detection device during the specified time period. of The secondary heights obtained at each time step S4 The type of VOCs gas collected at the site is determined, and it is determined whether it includes [the following]. type, If so, then corresponding sites Add to the list of locations to be flagged for alarm purposes; If not, then not The corresponding site Add to the list of locations to be flagged for alarm; S6, based on pre-constructed sites -VOCs gas generating equipment-Grid where VOCs generating equipment is located The binding relationship is used to match the VOCs generating device bound to each site in the list of potential alarm sites and the grid corresponding to the matched VOCs generating device. And issue a notification and alarm; The periodic concentration site floating map associated with the specified time period is constructed floatingly through the following method steps: L1, in each of the specified time periods Periodic At any given time, acquire each of the aforementioned grids. Each of the VOCs gas generating devices in the middle has the second-level height The corresponding site The VOCs gases collected at each location concentration ; L2, in each Among them, the concentrations ranked first were extracted. The gas concentration forms a gas concentration set. ; L3, judgment Does the concentration of each gas exceed its corresponding concentration threshold? If so, then proceed to... Periodic At any time for the grid The first-level height site The process of adjusting the setting position, after which the position adjustment is completed, yields the location. exist The first level of the cycle Then proceed to step L4, the site Also updated to site ; If not, then in Maintain the site during the period The setting location and in The period settings are in the same location; L4, in each cycle of the specified time period At any given moment, from the point where the position adjustment is completed. Collect each of the VOCs gases at the location concentration and form sites -Grid -cycle of Time - Concentrations collected The binding relationship is then established, and this binding relationship is used as the binding point, with each period's... Time and Grid The x and y coordinates of the binding points are respectively the horizontal and vertical coordinates of the binding points in the XY coordinate system. The binding points are plotted on the XY coordinate system to form the periodic concentration site floating map.

2. The VOCs source analysis and early warning method according to claim 1, characterized in that, In step L3, Periodic The site is dynamically adjusted in real time. The location method includes the following steps: L31, obtain the specified time period Within the period At any time in the grid The next level The concentration detected at the top Concentration of each VOC gas ; L32, obtain the specified time period Within the period At that time, in the grid Each secondary height VOCs gases detected at the location concentration And extract the top-ranked results obtained in step L31. VOCs gas concentration of the same type The grid Each site in the matrix that produces VOCs gas Having the corresponding secondary heights ; L33, for each type of VOC gas obtained in steps L31-L32 Calculate the concentration difference ; L34, according to Calculate each type of VOC gas The diffusion factor; L35, based on each of the calculated diffusion factors in Within the period Within a preset time period after the time, the site will be The horizontal position is adjusted to the site. .

3. The VOCs source analysis and early warning method according to claim 2, characterized in that, In step L34, each type of VOCs gas The diffusion factor is calculated using the following formula (1): In formula (1), Indicates generation in the grid The type in VOCs gas in Periodic The diffusion factor at time; Indicates to proceed The number of VOCs gas types calculated.

4. The VOCs source analysis and early warning method according to claim 3, characterized in that, site The horizontal position is adjusted to the site. The method includes the following steps: L351, identify the concentrations obtained in step L32 that participate in the concentration difference calculation in step L33. Corresponding VOCs gas generation sites As a site The basis for adjusting the horizontal position; L352, horizontally move the site And calculate the moved site With each distance ; L353, calculate each of the distances Distance ratio ; L354, determine each of the aforementioned distance ratios Does it satisfy the corresponding diffusion factor? proportional relationship, If so, then the site The site after horizontal position adjustment And terminate the position adjustment process; If not, proceed to step L355; L355, determine whether the preset allowable time for position movement has been reached. If so, then via the stated site Move back to Location; If not, return to step L352 and continue moving the site horizontally. .

5. The VOCs source analysis and early warning method according to claim 4, characterized in that, In step L353, the distance ratio is calculated using the following formula (2). :

6. The VOCs source analysis and early warning method according to claim 4, characterized in that, The distance ratio mentioned in step L354 Satisfying the corresponding diffusion factor The proportional relationship is: judge Whether it falls into The corresponding factor value range, If so, then determine and Satisfy the proportional relationship; If not, then determine and The proportional relationship is not satisfied.

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