Achieve ultra-low emissions: Optimize the galvanizing line with annealing furnace flue gas denitrification technology

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With the improvement of environmental protection requirements, nitrogen oxide emissions from hot-dip galvanized continuous annealing furnaces have become the focus of attention. This paper discusses the application and research progress of denitration technology, using advanced catalyst and SCR denitration system to achieve clean production, improve product quality and improve air quality, and promote green production.

With the increasingly severe environmental protection requirements, the pollution control in the production process of the iron and steel industry is particularly important. As a widely used surface treatment technology, hot dip galvanizing produces nitrogen oxides in the production process. This paper mainly discusses the technical application and research progress of hot dip galvanizing continuous annealing furnace in denitrification.

Hot dip galvanizing is a common steel surface treatment technology, by plating a layer of zinc on the surface of steel to improve the corrosion resistance of the material, and continuous annealing furnace is in the process of hot dip galvanizing, used to process the coating material to a certain temperature to improve its physical properties of a device. Hot dip galvanizing process can not only improve the corrosion resistance of steel materials, but also widely used in construction, automobiles, home appliances and other fields. However, the continuous annealing furnace in the process of hot dip galvanizing will produce a certain amount of nitrogen oxides, which will pollute the environment, and it is of great significance to develop effective denitrification technology for cleaner production.

Hot dip galvanizing continuous annealing furnace is one of the key equipment in hot dip galvanizing production line, through high temperature heating, the formation of a solid bond between zinc and steel substrate, while improving the mechanical properties of the material. The thickness of raw material sheet for hot-dip galvanized production is relatively broad, resulting in large fluctuations in furnace temperature and flue gas flow in the production line, so the honeycomb catalyst that can adapt to fluctuations in various working conditions, high air speed, high activity and high mesh number is selected, the temperature window is wide, the footprint is small, and the influence of moisture in the flue gas is fully considered. In addition, the catalyst is independently produced by using advanced production technology at home and abroad, which can effectively control the catalyst cost, reduce the cost of replacing the catalyst, and save the later cost.

In order to reduce the impact on the environment, SCR ₃ takes advantage of NH₃ or urea as a reducing substance. Under a certain temperature and under the action of a catalyst, NH₃ takes advantage of NH₃ to reduce NOx to N₂ and H₂O. With the progress of science and technology and the influx of new materials, China's smelting technology has been significantly improved, among which galvanized lines and annealing furnaces have played a key role. We are committed to promoting clean production and green and low-carbon development, which not only produces more high-quality products, but also improves the air quality in and around the factory and reduces environmental pollution. This responsible approach is an inevitable requirement in the process of industrialization, and it is also the driving force for us to help customers solve environmental problems and jointly maintain the blue sky and white clouds. We hope that everyone can voluntarily reduce pollution and jointly protect our health and blue sky.