Innovation

According to David, the flue gas terminal treatment technology mainly includes three aspects. The first is the integrated technology of desulphurization and dust removal in the dense coherent tower. The integrated desulphurization and dust removal technology of dense and relevant columns have realized the efficient and low-consumption operation of desulphurization and dust removal system. The desulphurization efficiency has reached more than 95%, the dust concentration at the outlet is less than 10 mg/m 3 (standard state), the pressure drop of the system is less than 2,000 Pa, and the mass fraction of CaO in the by-products is less than 8%.

The company is the first in the industry to completely eliminate bypass, and the combined fan greatly reduces operating power consumption, so as to realize 100% complete synchronous operation of production facilities and environmental protection facilities. The second is the technology of low-temperature oxidation and denitrification. Low-temperature oxidation and denitrification mainly use the oxidation property of ozone to oxidize insoluble low-price nitrogen oxides to soluble high-price nitrogen oxides and then absorbs nitrogen oxides in the washing tower to achieve the purpose of removal.

The whole set of denitrification device does not change the original flue and post-treatment measures but only needs to add ozone generator, controller, distributor and other key equipment and components, and share desulfurization absorber. Finally, the integrated technology of desulfurization and denitrification of active coke is introduced. The integrated desulfurization and denitrification technology of active coke is a dry flue gas treatment technology that utilizes the adsorption catalytic function of active coke to remove sulfur oxides and nitrogen oxides in the flue gas and recycle sulfur resources. Active coke desulfurization is based on adsorption and catalytic oxidation of SO2 on the active coke surface, while active coke denitrification is based on catalytic action on the active coke surface.

Inspiration

The energy consumption of the iron and steel industry accounts for 14.16% of China's total energy consumption. In the production process of iron and steel enterprises, energy efficiency is only about 30%, and the recovery and utilization rate of solid waste is about 50%. A large number of pollutants are discharged into the environment during the production process of the iron and steel industry. The total amount of industrial wastewater, dust and sulfur dioxide discharged by the industry accounted for 10%, 15% and 10% of the total industrial pollution discharged in China, respectively. (Miao et al, 2019). David said, in China, regulations, and requirements on energy conservation, environmental protection, consumption reduction, and emission reduction are increasingly strict, which urges steel companies to accelerate the reform and innovation of environmental protection manufacturing process, technology, and equipment, and realize energy conservation and emission reduction by relying on technological progress.

Overall impact

The application of this technology has three advantages. Firstly, the equipment investment is low, the equipment occupies a small area, the system is simple and the products after ozone oxidation do not produce secondary pollution. Secondly, the process is operable, the denitrification efficiency can be adjusted, and the operation cost is low. Thirdly, dust and SO2 have no effect on denitrification efficiency and are suitable for low-temperature flue gas of steel sintering.

Business benefit

Utilizing desulfurization and denitrification technology to effectively recover by-products of flue gas desulfurization and denitrification is of great practical significance for the iron and steel enterprises to reduce production costs. While controlling environmental pollution, the enterprise reduces the operating cost of the enterprise in this respect and reduces the risk of pollution for the second time. By using this method, the proportion of production costs reduced by the enterprise is about 25.76%, which is quite considerable.

Social and environmental benefit

The technology of flue gas end treatment used by Tangyin Iron and Steel Co., Ltd. will have two positive effects on society and the environment. Firstly, this innovation helps to protect the atmospheric environment and prevent harmful gases such as SO2 from entering the air, endangering the survival and development of human beings, animals and plants. Besides, this company undertakes the social responsibility of protecting the environment, which is beneficial to the future development of enterprises.

Interview

David Zhang, Vice-Minister