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    Treatment of chemical waste gas in chemical industry

    来源:admin(传梦环保整理发布)   时间:2018-08-28

    Treatment of chemical waste gas in chemical industry


    Chemical waste gas refers to poisonous and harmful gases discharged from chemical plants in chemical production. Chemical waste gas often contains many kinds of pollutants, and its physical and chemical properties are complex, and its toxicity is not the same. It seriously pollutes the environment and affects human health. Chemical waste gases produced by different chemical industries vary greatly. For example, chlorine, hydrogen chloride, vinyl chloride, mercury, acetylene are the main waste gases produced by the chlor alkali industry. The waste gases produced in the nitrogen fertilizer industry mainly contain nitrogen oxides, urea dust, carbon monoxide, ammonia, sulfur dioxide, methane and so on.

    Classification of chemical waste gas in chemical industry:


    According to the presence of pollutants, chemical waste gas can be divided into particulate pollutants and gaseous pollutants, and particulate pollutants include dust particles, dust, smoke, dust, coal dust and so on, and gaseous pollutants include sulfur compounds, chlorinated compounds, carbon and oxygen compounds, hydrocarbons, halogen compounds and so on.
    According to the relationship with pollution sources, it can be divided into one pollutant and two pollutants. The original substance directly discharged from the pollution source of the chemical plant has not changed after entering the atmosphere, and it is called a pollutant. If a pollutant has a chemical reaction with the central plain, it forms a new pollutant which is different from the original pollutant, which is called the two pollutant.
    According to the nature of pollutants, chemical waste gas can be divided into three categories: the first kind is the waste gas containing inorganic pollutants, mainly from nitrogen fertilizer, phosphate fertilizer (containing sulphuric acid), inorganic salt and other industries; the second kind is the waste gas containing organic pollutants, mainly from organic raw materials and synthetic materials, pesticides, flammable materials, coatings and other industries, and the third kind contains both inorganic pollution. Dyes and organic pollutants also come from chlor alkali, coking and other industries.

    Characteristics of chemical waste gas in chemical industry:


    The chemical industry has complex production facilities and different treatment facilities. The treatment of waste gas plays an important role in the petrochemical industry. Chemical waste gas has the following characteristics:
    1, inflammable and explosive gas are more. Such as low boiling ketones, aldehydes, and polymerized unsaturated hydrocarbons, a large number of flammable and explosive gases, such as no appropriate measures, can easily cause fire and explosion accidents and have great harm.
    2, most of the emissions are irritant or corrosive. Such as sulfur dioxide, nitrogen oxides, chlorine gas and other gases are irritant or corrosive, especially with the maximum emission of sulfur dioxide, sulfur dioxide gas directly damage the human health, corrosion of the surface of metals, buildings and sculpture, and easily oxidized to sulphate to the ground, pollution of soil, forests, rivers, lakes.
    3. There are many kinds of floating particles in the exhaust gas and great harm. The floating particles excluded from chemical production include dust, smoke, acid fog, and so on, which are harmful to the environment. Especially when floating particles exist at the same time with harmful gases, they can produce synergy and are more harmful to human beings.
    2, exhaust gas adsorption: through activated carbon chemical modification, targeted adsorption, reduce external emissions, is the domestic use of low cost waste gas treatment methods. However, because activated carbon is easy to saturate, it needs to be replaced periodically, and the running cost is high. Therefore, it is recommended to choose the spray tower and the photocatalytic plasma and central dust removal and swirl plate tower.


    Waste gas purification is mainly the control of industrial waste gas produced in industrial places such as dust particles, smoke dust, odor gas and toxic and harmful gas. The common waste gas purification includes the purification of factory smoke and dust, the purification of dust and waste gas in the workshop, the purification of organic waste gas, the odor purification of waste gas, the purification of acid and alkali waste gas, and the purification of chemical waste gas.

    Definition of chemical waste gas in chemical industry:


    Waste gases from industrial production often have harmful effects on the environment and human health. Cleaning measures should be taken before entering the atmosphere to meet the requirements of exhaust emission standards. This process is called exhaust gas purification. Commonly used exhaust gas purification methods are: absorption, adsorption, condensation and combustion four.


    Chemical waste gas purification system

    A complete exhaust purification system is usually made up of five parts. They are gas collection devices (gas collecting covers) that capture pollution gases, pipes connected to each part of the system, purifier that purifies the polluted gas, and the ventilator that provides power for the flow of gas, and makes use of the diffusion dilution capacity of the atmosphere to reduce pollution. A chimney.


    Gas collector for chemical waste gas

    Pollutant capture usually refers to the control and collection of pollutant-containing airflow emitted from the equipment opening. Through effective collection of pollutants to ensure a good production and living environment around, as far as possible to transport and purify the least amount of gas, the highest efficiency. Gas collector is used to collect pollutants. Its performance has a direct impact on the technical and economic indicators of local exhaust purification system.


    Chemical waste gas pipeline

    Pipe intake is an integral part of the exhaust gas pollution control system. The pipeline system is used to transport airflow in the purification system, and the equipment and components of the system are connected into a whole through the pipeline. The rational design, construction and use of pipeline system can not only give full play to the effectiveness of the control device, but also directly relate to the economic rationality of the design and operation.


    Chemical waste gas purification equipment

    Gas purification service is the core part of the purification system. When the pollutants in the exhaust contain the most discharge standards, they must be purified before reaching the discharge standard before they can be discharged into the atmosphere.

    Chemical waste gas fan


    The fan is the power unit for gas flow in the purification system. Fans are usually placed behind the purification equipment to prevent fan wear and corrosion.

    Chemical waste gas chimney


    The chimney is the exhaust device of the purification system. As the purified gas still contains a certain concentration of pollutants, these pollutants diffuse, dilute in the atmosphere after the chimneys are discharged and eventually settle down to the ground. In order to ensure that the ground pollutant concentration does not exceed the ambient air quality standard, the chimney must have a certain height. In addition, in order to ensure the normal operation of the waste gas purification system, according to the different purification objects, the necessary auxiliary equipment is often added in the purification system.
    For example, the cooling device, the waste heat utilization device when dealing with the high temperature gas, the pipe compensator that satisfies the heat expansion and contraction of the steel, the explosion-proof device for transporting the flammable and explosive gas, and the various valves used to adjust the balance of the air volume and pressure of the system, and the measuring instruments, the control instruments and the measurement of various parameters in the system. Holes are used to support and fix pipes and equipment brackets, noise reduction devices for fans, etc.


    Chemical waste gas treatment equipment

    Waste gas treatment equipment is widely used in chemical plant, electronic plant, spray painting plant, automobile factory, paint factory, petrochemical industry, furniture factory, food factory, rubber factory, plastic factory and other industries such as odor, odor and toxic and harmful gases.
    In many equipment of waste gas treatment, we should choose low cost, less energy consumption, no two pollution, save energy and environmental protection.
    Waste gas treatment tower generally has acid mist exhaust gas treatment tower, FRP exhaust gas treatment tower, biological waste gas treatment tower, PP spray waste gas treatment tower and so on.

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