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Objects and requirements of exhaust gas treatment
Origin：Hefan Hit： Time：2020-03-21
I. Waste gas treatment object
Due to human activities and natural processes, pollutants are discharged into the clean atmosphere, resulting in atmospheric pollution, and human activities, especially human production activities, are the main causes of atmospheric pollution. These pollutants include the exhaust gas emitted from the materials in the production equipment and transportation equipment through chemical and physical changes, as well as the physical and chemical changes. They also include the exhaust gas emitted from the fuel combustion, material storage, and loading and unloading processes related to these processes. various kinds. In China, the combustion of various fuels: especially the pollution caused by the combustion of coal, accounts for the largest proportion of various sources of pollution. Therefore, in terms of pollution types, China is a soot pollution type, and particulate matter and SO2 and NO2 have become the most important pollution characteristic indicators.
In China, air pollution is serious. This is because China has achieved rapid economic development since the reform and opening up, but it has not escaped the traditional economic growth model characterized by large consumption of resources and operations, so the energy efficiency is low. The high consumption of raw materials, the large amount of pollutants, and the small output result in worsening pollution. Economic transformation will improve the state of the environment, and in order to change this situation, air pollutants must be treated to improve the quality of the environment. To this end, comprehensive management measures must be adopted, and one of the important methods is to control the discharge of pollutants from pollution sources. This is the basis for ensuring the quality of the environment, and also provides a prerequisite for the effective implementation of comprehensive governance.
This article describes the exhaust gas treatment techniques of man-made pollution sources, focusing on the treatment of industrial exhaust gas (including fuel combustion and process production processes), and attaches great importance to automobile exhaust gas treatment. Due to the many types of pollutants contained in exhaust gas, especially industrial pollution sources due to the different raw materials and process routes used, different product categories, and the characteristics of discharged pollutants (physical, chemical and biological characteristics) are also different, and the treatment technology involves a wide range. Therefore, this article focuses on the treatment of major pollutants that are large in volume, wide in scope, and harmful.
In the introduction of the treatment methods, not only the more general treatment methods (or unit processes of treatment technologies), but also special treatment methods for certain pollutants are introduced.
Treatment for a certain kind of special pollutants: The production process, product use, or raw materials used for some products have their own unique features, so the treatment methods and technical routes for the pollutants they produce are also special. Although these methods have no universal application significance, they have great practical significance in solving such production pollution problems.
More general methods: For some major air pollutants such as particulate pollutants, SO2, NOx, organic pollutants, etc., the treatment methods used have universal significance regardless of the applicability, validity, or required raw materials of the methods. . Suitable for the treatment of pollutants in a certain industry: The air pollutants produced by some production industries have certain similarities, so the treatment methods are also common, but not necessarily applicable to other industries.
Requirements for exhaust gas treatment
The purpose of waste gas pollution source treatment is to improve the quality of the atmospheric environment, ensure the health of the population, maintain ecological balance, and promote a virtuous circle. To achieve this, the following requirements must be fulfilled.
1. Implement total emission control of major pollutants
The quality of the regional atmospheric environment mainly depends on the total amount of pollutants entering the regional gas environment, not the emission concentration of each pollution source. Therefore, the exhaust gas treatment must meet the requirement of reducing the total emissions of major pollutants as much as possible.
2. Reduce the amount of pollutants generated during economic activities
By improving product design, try not to use toxic raw materials, reduce energy consumption and raw material consumption, and make products entering the market meet the requirements of green products. For the pollutants that still need to be discharged after the application, the effective treatment technology is selected for treatment.
3. Screen exhaust gas treatment technology and adopt the best practical technology whenever possible
When conducting exhaust gas treatment, we must refer to the best practical technology and feasible practical technology catalogue published by the Ministry of Environmental Protection according to the actual conditions of the region and industry. , Environmental benefits (effects of pollution control), feasibility and advanced nature are comprehensively considered, and the best practical technology is adopted as far as possible.