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During the “Twelfth Five-Year Plan†period, the government focused on building a national environmental monitoring network with air environment monitoring, water quality monitoring and pollution source monitoring as the main body, forming the basic framework for environmental monitoring in China. In the "13th Five-Year Plan" proposal, it has been clarified that "improving environmental quality as the core". From the preliminary results of the "three major battles of gas, water and soil" pushed by the Ministry of Environmental Protection, the next step is to improve the environmental quality. It is a test of existing governance facilities and governance tools. The test of the effects of governance in the three areas relies on a comprehensive and effective environmental monitoring network.
At present, most enterprises have simple treatment technology. The VOCs pollutants generated by the production process in the production workshop are collected through the pipeline collecting hood and then discharged through the activated carbon adsorption device. However, there are organized emission exceeding standards and unorganized emissions in the park. The problem is to urge enterprises to improve production processes and treatment devices and reduce unorganized emissions. It is recommended that the park deploy a gridded regional monitoring system.
An overview of an industrial VOCs online monitoring system project:
According to the source of the pollutants, the grid monitoring system of the industrial park is established. The regional grid monitoring system adopts the unit grid management method, and establishes the “horizontal to the side†according to the concept of “network freeze, grid responsibility, and responsibilityâ€. The regional grid monitoring platform, which applies and integrates many intelligent environmental protection technologies, is based on the Gaussian algorithm model based on comprehensively grasping and analyzing pollution source emissions and meteorological factors. Real-time statistics of monitoring equipment data of various plant areas and monitoring points, and analysis of the overall emissions within the speculative area based on the emissions of each monitoring point and its meteorological conditions. Realize the overall monitoring of VOCs emission area, the estimation of pollutant diffusion trend, the analysis of emission sources, etc., and combine advanced technologies such as Internet of Things, intelligent acquisition system, geographic information system and dynamic chart system to integrate, share and develop, and establish a comprehensive, The refined, informatized and intelligent regional online monitoring platform realizes integrated management of controlling pollution sources, reducing air pollution, and providing reliable data information and scientific auxiliary management decisions for energy conservation and emission reduction programs.
Second deployment plan:
According to the distribution and characteristics of toxic and harmful gases in the region, the distribution of environmentally sensitive areas, and the dominant wind direction, combined with the construction of the original monitoring stations in the park, identify the key ways of spreading environmental emergencies and coordinate the construction of VOCs in industrial parks.
On the basis of comprehensive consideration of the importance of the region, the degree of pollution of atmospheric pollutants, and the level of industrialization, the area is meshed, and monitoring points are set at the intersection or center of the grid, using distributed redundancy. The residual node judgment algorithm removes redundant nodes of the sensor, thereby reducing computational complexity, communication overhead, and equipment cost. At the same time, it can accurately judge the validity and accuracy of the monitoring data, and can draw the diffusion trend of pollutants in different periods in the region, which is conducive to scientific decision-making on pollutant control. Each test site contains real-time monitoring of various indicators such as methane, total hydrocarbons, non-methane total hydrocarbons, benzene, toluene, and xylene.
Three system advantages:
â— The monitoring point group has many distributions, flexible configuration and simple operation;
â— Widely used in the fixed chemical source emissions, plant boundaries, regions and leakage points of chemical enterprises;
â—High stability - digital pneumatic control technology, retention time locking (RTL) technology;
â— High degree of automation - automatic, continuous operation, safety warning;
â—With automatic purging function, reducing operation and maintenance costs and improving product reliability;
â— Provide scientific and reliable technical support for environmental pollution assessment, pollution traceability, environmental quality simulation and prediction, and emergency management decision-making.
At present, China's economy is in an important period of development. It is also a key stage in alleviating environmental pollution and curbing the trend of ecological deterioration. It is firmly grasping the historical opportunities in the new era, making great efforts to solve outstanding environmental problems and promoting coordinated economic, social and environmental development. Implementing a sustainable development strategy is the most important task of environmental protection.