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Steel plant waste gas treatment plan

Views: 6     Author: Xicheng EP Ltd     Publish Time: 2022-07-06      Origin: Xicheng EP Ltd

The main sources of waste gas in steelmaking plants are:

①The transportation, loading and unloading and processing of raw materials and fuels generate a large amount of dusty waste gas;

② A large amount of waste gas containing dust and harmful vapors will be generated during the reproduction of various kilns in the iron and steel plant;

③ Waste gas emitted from chemical reactions in the production process, such as waste gas generated during smelting, coking, chemical products and pickling of steel.

The emission of waste gas from iron and steel enterprises is very large and the pollution area is wide; the temperature of waste gas discharged from metallurgical kilns is high, and the emission of iron oxide dust in the process of iron and steel smelting is mostly iron oxide dust, which has small particle size and strong adsorption force, which increases the difficulty of waste gas treatment; In the blast furnace tapping, slag tapping, etc. and some processes in the steelmaking process, the generation and emission of flue gas are intermittent, and there are many unorganized emissions. The waste gas produced in the iron and steel industry has the value of recovery, such as the recovery of waste heat from high temperature waste gas, the utilization of gas generated in the process of coking, iron making and steel making, and the recovery and utilization of iron oxide dust.

The iron and steel industry is a major polluter of the atmosphere, and the waste gas treatment of the iron and steel industry must implement the principle of comprehensive treatment. Efforts are made to reduce energy consumption and raw material consumption, which is one of the fundamental ways to reduce waste gas emissions; reform processes and adopt advanced processes and equipment to reduce waste gas emissions from production processes; actively adopt high-efficiency and energy-saving treatment methods and equipment to strengthen waste gas emissions. Treatment and recycling; vigorously carry out comprehensive utilization.

so2 removal wet scrubber

Waste gas treatment plan:

The upper part of the spray tower is sprayed with alkaline absorption liquid. The harmful gas enters from the lower part of the tower and flows in the opposite direction with the spray liquid. After spray treatment, it enters the inner cylinder processor of the purification tower, and the exhaust gas passes through the packing layer composed of packing, and then undergoes two spray treatments, so that the gas-liquid two phases are fully contacted and the absorption reaction occurs, so as to achieve the purpose of high-efficiency purification. The treated exhaust gas is then deliquored by a dehydrator, which provides an excellent operating environment for activated carbon and photocatalysis.

Utilize special high-energy and high-ozone UV ultraviolet beam to irradiate waste gas to crack industrial waste gas such as: ammonia, triamine, hydrogen sulfide, methyl sulfide, methyl mercaptan, methyl sulfide, dimethyl disulfide, carbon disulfide and styrene, sulfide The molecular chain structure of H2S, VOCs, benzene, toluene, and xylene makes the molecular chain of organic or inorganic high-molecular odorous compounds degrade into low-molecular-weight compounds, such as CO2, H2O, etc., under the irradiation of high-energy ultraviolet light beams.

The high-energy and high-ozone UV light beam decomposes the oxygen molecules in the air to generate free oxygen, namely active oxygen. Because the positive and negative electrons carried by the free oxygen are unbalanced, they need to combine with the oxygen molecules to generate ozone. UV+O2→O-+O* (active oxygen) O+O2→O3 (ozone), *Ozone has a strong oxidation effect on organic matter, and has a strong scavenging effect on industrial waste gas and other irritating odors.

The use of activated carbon in wastewater treatment can effectively remove odor, odor, improve chroma, and also can effectively remove various impurities in water such as chlorine, phenol, mercury, lead, arsenic, ammonia, nitrogen compounds, detergents, agricultural chemicals and other harmful substances Has a high removal rate. For example, when used in waste gas treatment equipment, it has a good adsorption effect on organic solvent waste gas such as benzene, alcohol, ketone, ester and gasoline.

The purification principle of the activated carbon adsorption tower in the waste gas treatment equipment is that the organic waste gas enters the activated carbon adsorber tower under positive or negative pressure. , it can attract gas molecules to concentrate and keep them on the solid surface, so that the pollutants are adsorbed. After the exhaust gas passes through the filter, it enters the dust removal system of the equipment, and the purified gas is discharged up to the standard.

The organic solvent in the exhaust gas is adsorbed by using the characteristics of activated carbon's micropores and huge surface tension, so that the exhaust gas can be purified. After the activated carbon is saturated with adsorption, it is necessary to regenerate the activated carbon, which is to remove the adsorbate adsorbed on the micropores of the activated carbon under the premise of not destroying its original structure in physical or chemical methods, and restore its adsorption performance to facilitate repeated use.

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