CN-115236271-B - Volatile pollutant monitoring method and system

CN115236271BCN 115236271 BCN115236271 BCN 115236271BCN-115236271-B

Abstract

The embodiment of the invention provides a volatile pollutant monitoring method, and belongs to the field of pollutant monitoring. The volatile pollutant monitoring method comprises the steps of meshing a monitoring area into grid units, obtaining pollutant concentration, wind speed and wind direction in the grid units, determining concentration residence time of pollutants according to the wind speed and the wind direction, determining grid weight concentration according to the pollutant concentration and the concentration residence time, dividing concentration intervals according to the size of the grid weight concentration, correspondingly different identifiers in each concentration interval, and displaying the identifiers corresponding to the concentration intervals of the grid units. According to the method, the monitored pollutant concentration is coupled with the wind speed and the wind direction so as to determine the grid weight concentration of the grid unit, the grid weight concentration is divided into concentration intervals, the grid unit is displayed according to the identification corresponding to the concentration interval to which the grid unit belongs, and the dynamic change process of the grid unit concentration can be observed through the identification and effective tracing is carried out.

Inventors

JIA RUNZHONG
GUO YIRONG
LI YING
XIAO ANSHAN
ZHU LIANG

Assignees

中国石油化工股份有限公司
中国石油化工股份有限公司青岛安全工程研究院

Dates

Publication Date: 20260505
Application Date: 20210423

Claims (11)

1. A method of monitoring volatile contaminants, comprising: gridding the monitoring area into grid cells; The pollutant concentration, the wind speed and the wind direction in the grid unit are obtained; determining a concentration residence time of the pollutant according to the wind speed and the wind direction; Determining grid weight concentration according to the pollutant concentration and the concentration residence time, wherein the calculation formula is as follows: , Wherein i and j are the position numbers of the grid units, For the grid weight concentration, M is the number of monitoring devices used for acquiring the pollutant concentration and the wind speed and wind direction in the grid unit, For the concentration of contaminants monitored by the kth monitoring device within the grid cell, For the kth monitoring device in the grid unit, corresponding to the Concentration residence time of (2); Dividing concentration intervals according to the size of the grid weight concentration, wherein each concentration interval corresponds to different identifications, and displaying the grid units by the identifications corresponding to the concentration intervals to which the grid units belong; Determining a concentration residence time of the contaminant from the wind speed and direction, comprising: The grid unit is a square grid unit, the side length is L, and the concentration residence time t k is calculated by using the following formula: , Wherein x is the distance between the monitoring equipment and the eastern boundary of the grid unit, y is the distance between the monitoring equipment and the northern boundary of the grid unit, θ is the wind direction angle, For the wind speed corresponding to the current time, Is a correction coefficient.
2. A method for monitoring volatile contaminants according to claim 1, characterized in that, The correction coefficient Calculated using the following formula: , Wherein n=60/the monitoring device analyzes the number of cycles in minutes, f is the number of cycles in the calculation cycle, the initial value of f is 1, and each calculation cycle f is added with 1.
3. The method of monitoring volatile contaminants of claim 1, further comprising: And calculating the pollution contribution rate of the grid unit to the monitoring area within a preset time period, wherein the pollution contribution rate comprises a static pollution contribution rate and a dynamic pollution contribution rate.
4. A method of monitoring volatile contaminants as in claim 3, further comprising: Dividing contribution rate intervals according to the size of the pollution contribution rate, wherein each contribution rate interval corresponds to different marks, and displaying the grid unit by the marks corresponding to the contribution rate intervals to which the grid unit belongs.
5. A method of monitoring volatile contaminants according to claim 3, characterized in that the static contamination contribution of the grid cells to the monitored area is calculated using the formula: , Wherein i and j are the position numbers of the grid units, For the said static contamination contribution rate, For the number of grid weight concentrations exceeding the pre-warning threshold calculated by the grid unit in the preset time period, And calculating the number of all grid weight concentrations of the grid cells in the preset time period.
6. A method of monitoring volatile contaminants according to claim 3, characterized in that the dynamic contamination contribution of the grid cells to the monitored area is calculated using the formula: , Wherein i and j are the position numbers of the grid units, For the said dynamic contamination contribution rate, And (5) weighting the concentration of the grid.
7. The method of claim 1, wherein the number of monitoring devices installed is determined based on the number of pollution sources within the grid cells, the monitoring devices installed downwind of the direction of wind that the pollution sources are dominant throughout the year.
8. A volatile pollutant monitoring system is characterized by comprising a monitoring device, a processor and a display; the monitoring equipment is used for monitoring the concentration of pollutants, the wind speed and the wind direction; the processor is used for gridding the monitoring area into grid cells; determining a concentration residence time of the pollutant according to the wind speed and the wind direction; Determining grid weight concentration according to the pollutant concentration and the concentration residence time, wherein the calculation formula is as follows: , Wherein i and j are the position numbers of the grid units, For the grid weight concentration, M is the number of monitoring devices used for acquiring the pollutant concentration and the wind speed and wind direction in the grid unit, For the concentration of contaminants monitored by the kth monitoring device within the grid cell, For the kth monitoring device in the grid unit, corresponding to the Concentration residence time of (2); dividing concentration intervals according to the grid weight concentration, wherein each concentration interval corresponds to different identifications; the display is used for displaying the grid unit by the identification corresponding to the concentration interval to which the grid unit belongs; Determining a concentration residence time of the contaminant from the wind speed and direction, comprising: The grid unit is a square grid unit, the side length is L, and the concentration residence time t k is calculated by using the following formula: , Wherein x is the distance between the monitoring equipment and the eastern boundary of the grid unit, y is the distance between the monitoring equipment and the northern boundary of the grid unit, θ is the wind direction angle, For the wind speed corresponding to the current time, Is a correction coefficient.
9. The volatile contaminant monitoring system of claim 8, wherein the processor is further configured to: And calculating the pollution contribution rate of the grid unit to the monitoring area within a preset time period, wherein the pollution contribution rate comprises a static pollution contribution rate and a dynamic pollution contribution rate.
10. The volatile contaminant monitoring system of claim 9, wherein the processor is further configured to: dividing contribution rate intervals according to the pollution contribution rate, wherein each contribution rate interval corresponds to different marks; the display is also used for displaying the grid unit with the mark corresponding to the contribution rate interval to which the grid unit belongs.
11. The volatile contaminant monitoring system of claim 8, wherein the number of installations of the monitoring device is determined based on the number of sources of contamination within the grid cells, the monitoring device being installed downwind of a direction in which the sources of contamination predominate throughout the year.

Description

Volatile pollutant monitoring method and system Technical Field The invention relates to the field of pollutant monitoring, in particular to a volatile pollutant monitoring method and system. Background In the comprehensive treatment scheme of volatile organic compounds in key industries issued by the ecological environment department in month 6 of 2019, the petrochemical industry industrial park is definitely required to construct a monitoring early warning monitoring system, and the comprehensive treatment scheme has the functions of carrying out navigation monitoring, gridding monitoring, tracing analysis and the like. For petrochemical enterprises, the environmental pollution control level is improved, pollution emission is effectively managed, however, the petrochemical enterprises have the characteristics of dense devices, multiple leakage sources, high pollutant emission concentration, so that the problems of undefined pollutant sources, cross pollution and the like exist in heavy pollution areas, and the pollution specific sources cannot be effectively traced due to the lack of real-time monitoring data on site, so that the pollution specific sources cannot be effectively managed and prevented. The gridding monitoring is used as an emerging environment monitoring control means nowadays, mainly depends on intelligent sensing, big data platform, "Internet+" and Internet of things technology, monitors the pollution condition in the grid in real time by gridding and dividing the monitoring area and arranging monitoring equipment in the grid, is an efficient and dense monitoring means, provides reliable and accurate data for preventing and treating the atmospheric pollution, and can comprehensively improve the monitoring quality. The implementation of the grid monitoring of the volatile pollutants can effectively help enterprises to realize the monitoring and early warning of the whole process emission of the gaseous pollution sources and the intelligent monitoring of the environmental quality, and is currently applied to the enterprise pollution emission management practice. However, current application practice of the gridding monitoring technology only depends on the change of the monitoring value to reflect pollution conditions, and a means for dynamically analyzing the volatile pollutants by utilizing the advantages of the gridding monitoring is lacking, so that the utilization of gridding monitoring data is insufficient. Disclosure of Invention The embodiment of the invention aims to provide a volatile pollutant monitoring method, which is used for coupling the monitored pollutant concentration with wind speed and wind direction so as to determine the grid weight concentration of a grid unit, dividing the grid weight concentration into concentration intervals, displaying the grid unit by a mark corresponding to the concentration interval to which the grid unit belongs, and observing the dynamic change process of the concentration of the grid unit and effectively tracing the source through the mark. In order to achieve the above purpose, the embodiment of the invention provides a volatile pollutant monitoring method, which comprises the steps of meshing a monitoring area into grid cells, acquiring pollutant concentration, wind speed and wind direction in the grid cells, determining concentration residence time of pollutants according to the wind speed and the wind direction, and determining grid weight concentration according to the pollutant concentration and the concentration residence time, wherein a calculation formula is as follows: Wherein i and j are the position numbers of the grid cells, For the grid weight concentration, M is the number of monitoring devices used for acquiring the pollutant concentration and the wind speed and wind direction in the grid unit,For the concentration of contaminants monitored by the kth monitoring device within the grid cell,For the kth monitoring device in the grid unit, corresponding to theDividing the concentration intervals according to the concentration of the grid weight, wherein each concentration interval corresponds to different identifiers, and displaying the grid unit by the identifier corresponding to the concentration interval to which the grid unit belongs. Optionally, determining the concentration residence time of the pollutant according to the wind speed and the wind direction, wherein the grid unit is a square grid unit, the side length is L, and the concentration residence time t k is calculated by using the following formula: Wherein x is the distance between the monitoring equipment and the eastern boundary of the grid unit, y is the distance between the monitoring equipment and the northern boundary of the grid unit, θ is the wind direction angle, For the wind speed corresponding to the current time,In order to correct the coefficient of the coefficient,Calculated using the following formula: Wherein n=60/the monitoring device analyzes th