Iron and steel industry waste gas treatment of ironmaking plant waste gas treatment

1) The characteristics and characteristics of the exhaust gas of the ironmaking plant.

The exhaust gas of the ironmaking plant is mainly used in the following process links: dust will be generated during the transportation, screening and transfer of blast furnace raw materials, fuel and auxiliary raw materials; Some harmful exhaust gases will be produced during blast furnace tapping, which mainly include pollutants such as dust, carbon monoxide, sulfur dioxide and hydrogen sulfide; The release of blast furnace gas and the waste gas containing dust and graphitic carbon are generated when the molten iron is poured in the iron casting machine.

2) Waste gas treatment technology of ironmaking plant.

1. Dust removal of the ore tank in front of the furnace.

The dust removal of the ore tank in front of the furnace of the ironmaking plant is mainly to solve the harmful dust generated by the combustion of raw materials such as blast furnace sinter, coke, miscellaneous ore and other raw materials during transportation, transfer, discharge, feeding and feeding. The fundamental measure to control the dust of the exhaust gas is to strictly control the powder content of the combustion of blast furnace raw materials, especially the powder content of sinter. In addition, the equipment at different dust generation points can be equipped with a closed cover and an exhaust dust removal system.

According to different situations, the sealing cover adopts a partial sealing cover (such as the transfer point of the belt conveyor), an integral sealing cover (such as a vibrating screen) or a large-capacity sealing cover (such as at the pit of the feeding trolley). The dust collector can use a bag dust collector, etc.

2. Dust removal in blast furnace tapping yard.

The blast furnace will produce a large amount of smoke and dust in the process of opening the furnace, plugging the iron mouth and tapping the iron. To this end, a primary dust removal system for local hooding and exhaust dust removal is set up at dust production points such as tap outlet, slag outlet, slag skimmer, iron ditch, slag ditch, residual iron can, swing flow nozzle, etc.; When opening and plugging the iron opening, the tapping yard must be equipped with a secondary dust removal system including a closed peripheral structure. The dust collector can use filter bag dust collector, etc.

3. Dust removal in the mud mill room.

The clay used in the blast furnace plugging iron mouth is made of silicon carbide, powder coke, clay and other powders. A large amount of dust will be generated in the process of loading, unloading, batching, mixing and shipping of various powders. A dust collection and dust removal system can be set up to treat these exhaust gases, and the dust removal equipment can use a bag dust collector to collect dust.

Fig. 11-7 is the process flow chart of dust removal in the mud mill room.

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What are the waste gas treatment methods of iron and steel plantsThe adsorption desorption concentration-catalytic combustion method is: when the flow rate of organic waste gas is large, the concentration is low, the temperature is low, and a large amount of fuel is consumed by catalytic combustion, the organic waste gas can be adsorbed on the adsorbent by adsorption means and concentrated, and then the organic waste gas is desorbed into a high concentration of organic waste gas through hot air purging, and then catalytic combustion is carried out.

Iron and steel plant waste gas treatment processIron and steel plant waste gas treatment process: waste gas collection, dust removal pretreatment, waste gas adsorption and desorption, catalytic combustion, exhaust gas up to the standard high-altitude emission.

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Metallurgical industry waste gas treatment methods are usually divided into the following types:

1.Physical methods: including adsorption, filtration, condensation, etc., these methods are mainly used to remove particulate matter and organic matter in exhaust gas.

2.Chemical methods: including catalytic oxidation, reduction, absorption, etc., these methods are mainly used to remove pollutants in the exhaust gas, such as SOX, NOX, etc.

3.Biological methods: including biofiltration, biofilm reactors, etc., which are mainly used to remove organic matter such as ammonia and hydrogen sulfide from exhaust gas.

4.Physicochemical combination methods: including plasma treatment, high-temperature oxidation, etc., these methods are mainly used to remove organic and inorganic substances in the exhaust gas.

Choosing the right waste gas treatment method needs to be decided according to different waste gas components and production processes, and it is recommended to seek help from a professional waste gas treatment company or environmental protection agency.

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Methods for treating industrial furnace exhaust gas and black smoke for power generationMetal dust particles generated in the process of metal melting and SO2 and NOx harmful gases generated in the process of burning diesel (heavy oil) by furnace equipment in the hardware industry, die-casting industry and foundry industry, and exhaust gas generated in the process of burning diesel (heavy oil) when the generator is working.

Hazards of furnace exhaust gases and black smoke from generators:Furnace exhaust gas and black smoke from generators are the main causes of acid rain, which cause large air pollution, especially to the on-site operators, crops and soil near the factory.

Treatment method: swirl water washing spray method + lye absorptionFor the exhaust gas of the furnace and the black smoke discharged from the generator set, according to the current conventional practice, the swirl plate water washing spray method is adopted, and the cyclone plate spray tower is adopted, the gas moves at high speed from the bottom to the top in the tower, and the washing liquid sprayed out from the top to the bottom is in contact, because the tower is provided with a multi-layer cyclone plate, it can increase the gas-liquid contact area and contact time, so that the tail gas and the water are in full contact with the tower and the plate surface. The pollutant carbon black in the exhaust gas is fully adsorbed by the water and purified during the contact with the spray water. Gaseous pollutants such as NOX and SO2 in the exhaust gas are alkaline by adding a certain proportion of NAOH to the spray water, and a chemical reaction occurs when the water is in contact with the tail gas during the spraying process, so that the gaseous pollutants such as NOX and SO2 can be neutralized and achieve a good treatment effect.

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The key depends on what your exhaust gas is, whether it is acidic or dusty gas, if the amount of exhaust gas is relatively large, it is acidic gas, you can use the cheaper alkaline spray tower on the market, as well as the packing tower, kick the ball tower, and discharge after filtration, if the toxic gas is best discharged after filtering through activated carbon, please specify your exhaust gas type. If it is dusty, you can use dust removal

The iron and steel industry waste gas treatment mainly analyzes that industrial waste gas ** is a large amount of dusty waste gas generated in the transportation, loading and unloading and processing of raw materials and fuels; In the process of reproduction of various kilns in iron and steel plants, a large amount of exhaust gases containing dust and harmful vapors will be generated; Exhaust gases emitted from chemical reactions in production processes, such as those produced during smelting, coking, pickling of chemical products and steel. Then different responses were developed for different **.

In the production process of the sintering plant, waste gas will be generated in the following production environment: 1. Dusty waste gas will be generated in the process of loading, unloading, crushing, screening, storage and transportation of sintered raw materials; 2. In the mixture system, the symbiotic waste gas of water vapor and dust will be generated; 3. When the mixture is sintered, it will produce high-temperature exhaust gas containing dust, flue gas, SO2 and NOx; 4. Sinter will also produce dusty waste gas in the process of crushing, screening, cooling, storage and transfer. The sintering plant produces a large amount of exhaust gas, and the concentration of dust and SO2 is high, so the pollution to the atmosphere is serious.

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

In the process of reproduction of various kilns in iron and steel plants, a large amount of exhaust gases containing dust and harmful vapors will be generated;

Exhaust gases emitted from chemical reactions in production processes, such as those produced during smelting, coking, pickling of chemical products and steel. The emission of exhaust gas from iron and steel enterprises is very large and the pollution is widespread; The exhaust gas emitted by the metallurgical kiln has a high temperature, and most of the waste gas emitted in the steel smelting process is iron oxide soot, which has a small particle size and strong adsorption force, which increases the difficulty of waste gas treatment. In some processes in the blast furnace tapping, slag extraction, etc., as well as some processes in the steelmaking process, the generation and emission of flue gas are paroxysmal, and there are many fugitive emissions. The waste gas produced by the iron and steel industry has the best value, such as the waste heat of the exhaust gas with high temperature, the utilization of coal gas generated in the process of coking, ironmaking and steelmaking, and the utilization of iron oxide-containing 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 to reduce energy consumption and raw material consumption are one of the fundamental ways to reduce exhaust emissions; Reform the process, adopt advanced technology and equipment to reduce the emission of waste gas from the production process; Actively adopt high-efficiency and energy-saving treatment methods and equipment to strengthen the treatment of waste gas; Vigorously carry out comprehensive utilization.

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Due to the different components of waste gas produced by different enterprises in the production process, the waste gas treatment equipment used is different, resulting in the complexity and simplicity of the industrial waste gas treatment process, depending on the specific situation of industrial waste gas as follows:

General waste gas treatment process:Hood, air duct, exhaust gas treatment equipment, fan, exhaust standard, chimney discharge.

Organic waste gas treatment process:Gas Gathering System: Dry and Wet Pretreatment, Activated Carbon, Zeolite Runner, Adsorption and Concentration, RCO RTO TO Co, Combustion Purification, Exhaust Emission Standards, Chimney Emissions.

Acid and alkali waste gas treatment process:Gas collection pipeline, acid-alkali chemical scrubber, fan, exhaust standard, chimney discharge.

Hello landlord, according to the questions you raised, the following will be answered in detail for you:

What are the waste gas treatment methods of iron and steel plantsThe adsorption desorption concentration-catalytic combustion method is: when the flow rate of organic waste gas is large, the concentration is low, the temperature is low, and a large amount of fuel is consumed by catalytic combustion, the organic waste gas can be adsorbed on the adsorbent by adsorption means and concentrated, and then the organic waste gas is desorbed into a high concentration of organic waste gas through hot air purging, and then catalytic combustion is carried out.

Iron and steel plant waste gas treatment processIron and steel plant waste gas treatment process: waste gas collection, dust removal pretreatment, waste gas adsorption and desorption, catalytic combustion, exhaust gas up to the standard high-altitude emission.

Hope it helps!

"Industrial Pollution Control Technology Series" is a summary of practical technology series. Its content is mainly to introduce typical examples of pollution control in various industrial production in China. In each volume of the series, a large number of examples of various pollutants are collected by different processes.

Most of these examples are selected from a number of examples with similar properties and similar treatment processes that are generally in continuous operation for more than two years, and are screened out according to the principles of reliable technology, reasonable economy and significant environmental benefits. For each example, a detailed introduction was made from the situation of the pollution source, the treatment process, the design and operation parameters, the size, operation, investment and benefits of the main equipment models and structures. In order to enable readers to have a comprehensive understanding of the status of industrial pollution control technology, the series also introduces the overview of industrial wastewater, waste gas, solid waste, noise and radioactive pollution control in separate volumes, and places it at the front of each volume as a general introduction; In the first chapter of each fascicle and the examples of each product type, the technical status of pollution control in the whole industry and each product type is summarized and evaluated.

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