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Purification technology of purification equipment

作者: 人气: Article Source: Author: Popularity: Issuing time: 2017-6-24 10:51:37

Purification technology of purification equipment


The treatment of exhaust gas should be carried out from two aspects: one is the exhaust gas dust removal for suspended particulate pollutants; the other is the purification of gaseous pollutants. The control of gaseous pollutants mainly uses physical and chemical properties, such as solubility, adsorption saturation, dew point, and selective chemistry Differences in reaction, etc., to separate pollutants from exhaust gas; or to convert pollutants into harmless or easy-to-handle substances. The basic methods of exhaust gas purification include absorption, adsorption, condensation, catalytic conversion, and combustion.

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Overview of air pollution control technology Air pollution control technology is an important countermeasure for air environmental protection. Clean combustion technology is a general term for all technologies such as processing, combustion, conversion, and pollution emission control, which reduce pollutant emissions and improve fuel efficiency in the combustion process. Sulfur dioxide, nitrogen oxides and smoke (dust) dust are the main air pollutants in China. Reducing emissions of sulfur dioxide, nitrogen oxides, and smoke (dust) is important for protecting and improving the atmospheric environment. Not only very important. And very urgent. Therefore, the following outlines the sulfur dioxide, nitrogen oxide and smoke (dust) dust control technologies.

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Clean combustion technology

Clean coal combustion technology refers to technologies that can reduce the emission of pollutants and improve the efficiency and reduce the emission of pollutants during the combustion of coal before purification. Including changing fuel properties, improving combustion methods, adjusting burning conditions, and appropriately adding additives to control the generation of pollutants.

High Chimney Smoke Emission Technology

The high chimney emission of the flue gas is to directly discharge the flue gas containing pollutants into the atmosphere through the high chimney. It is the spread and dilution of pollutants to a larger area and farther areas. The cleaned up-to-standard smoke is discharged into the atmosphere through the chimney. Use the effect of the atmosphere to further reduce the concentration of ground air pollutants.

Dust removal technology

Smoke (powder) dust purification technology, also called dust removal technology, is an operation process that separates particulate pollutants from exhaust gas and recovers them. The equipment that implements this process is called a dust collector. There are many types of gaseous pollutants and different characteristics, so the purification methods used are different. The commonly used methods are absorption method, adsorption method, catalytic method, combustion method, condensation method, and membrane separation method. , Electron beam irradiation purification method and biological purification method.

The control of smoke (powder) dust is mainly achieved by improving fuel technology and adopting dust removal technology.

(I) Improve combustion technology

Particulate matter such as smoke and coal dust produced by complete combustion is less than that produced by incomplete combustion. Therefore, the air supplied during combustion must be appropriate. Allow the fuel to burn completely. The amount of air supplied is greater than the theoretical air calculated by the plate reaction. If the amount of air supplied is less, it cannot be completely burned, and if it is increased, the temperature of the combustion chamber is reduced and the amount of smoke is increased. Full mixing of air and fuel is a condition for achieving complete burn.

(Two) using dust removal technology

This is an effective measure to control smoke (powder) dust. Dust removal technology can be divided into dry dust removal and wet dust removal according to whether there is liquid in the dust removal process. Generally according to the principle of particle separation in the dust removal process, the dust removal technology can be roughly divided into: suction dust removal, inertia dust removal, centrifugal dust removal, washing dust removal, filter dust removal, electric dust removal, and sonic dust removal.

(3) Reasonable choice of dust collector

Reasonable selection of dust collectors can not only ensure the dust removal efficiency required for compliance with standards, but also form the most economical dust removal system. In recent years, dust removal technology has developed rapidly, and the dust removal efficiency has also improved significantly, especially electrostatic dust removal and bag dust removal. Therefore, for some projects that are mainly air pollution and have the largest smoke (powder) dust emissions, such as large thermal power plants and large cement plants, electrostatic precipitators and bag filters are mostly used. The dust removal efficiency of the bag type dust collector is generally more than 99%, and it is widely used because of its high efficiency, stable and reliable performance and simple operation. In addition to bag-type dust collectors, electric dust collectors are also widely used due to their economical, convenient, and high dust removal efficiency. Electrostatic precipitator is the process of ionizing the dust-containing gas in the high-voltage power plant to charge the dust particles and deposit the dust particles on the dust collector under the action of the electric field force to separate the dust particles from the dust-containing gas. A kind of dust removal equipment. The fundamental difference between it and other dust removal processes is that the separation force (mainly electrostatic force) acts on the particles instead of the entire airflow, which determines that it has the characteristics of low energy consumption and small airflow resistance for separating particles . The main advantages of the electrostatic precipitator are: small pressure loss and high capture efficiency for fine dust. It can be higher than 99%, and can be operated under high temperature or strong corrosive gas.