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Exploration and research on key technologies of multi-layer heat supplying and H2-rich sintering |
YE Heng-di1,2, ZHOU Hao-yu1,2, WANG Ye-feng1,2, LI Qian1,2, LU Xing-fu1,2, LIU Qian1,2 |
1. National Engineering Research Center of Sintering and Pelletizing Equipment System, Changsha 410205, Hunan, China; 2. Zhongye Changtian International Engineering Co., Ltd., Changsha 410205, Hunan, China |
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Abstract In order to manage the environmental problem caused by greenhouse effect, China aims to peak its carbon dioxide emissions before 2030 and achieve carbon neutrality by 2060. The iron and steel industry ranks second just after the thermal power industry in terms of the carbon emission. Therefore, reducing carbon emission in iron ore sintering is an irresistible trend. In the conventional sintering, it is hard for the solid fuel particles to disperse more in the upper bed and less in the lower bed which is essential due to the heat auto-accumulation effect. Consequently, it is inevitable that the reducing atmosphere is locally present which brings about extra CO in the flue gas and adverse impacts on the sintering process, and the uneven heat pattern impairs the sinter quality and the energy efficiency. All these restrict the improvement of energy-saving and low-carbon emission in sintering process. Based on the analysis of the effects of the fuel form and fuel distribution on the sintering process, the "multi-layer heat supplying and H2-rich sintering" idea was proposed, which provided a new heat supplying method for upper, middle and lower layer in deep bed sintering condition. With the new method, the upper bed is heated up by the oxygen-rich ignition and solid fuel combustion, the middle bed by the combustion of H2-rich gas and solid fuel while the lower bed by the steam injection and solid fuel combustion. The low carbon combustion mechanism as well as the key technologies of the new method were elaborated. The solution to the possible deterioration of the wet layer in the application of the technologies was also put forward. The integration application of these technologies would help to reduce energy cost, carbon as well as other pollutants emission,and improve the sinter quality.
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Received: 11 June 2021
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