Development and application of techniques for energy conservation and emission reduction during sintering process based on multiple-component gases medium
FAN Xiao-hui1, GAN Min1, JI Zhi-yun1, ZHOU Zhi-an1,2, ZHOU Hao-yu1,2
1. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, Hunan, China; 2. Zhongye Changtian International Engineering Co. , Ltd. , Changsha 410125, Hunan, China
Abstract:High emission of flue gas containing multiple pollutants made sintering a process urging for energy conservation and emission reduction in whole steelmaking process. Effects caused by changes of gases medium on sintering has been introduced as well as the new technologies and techniques based on multiple-component gases medium. To recycle the flue gas and reuse the heat in hot exhaust gas,technology of regional selective flue gas recirculation was developed,which realized both emission and pollution reduction without deteriorating sintering indexes. For hot exhaust gas in circular cooler,technology of optimizing-recirculating to sintering was developed to improve the efficiency of waste heat utilization and reduce the uncontrolled emission of cooled exhaust gas. Effects of injecting different hydrogen-rich gases on sintering process have been revealed. Technology of hydrogen-rich gas gradually injection was developed to improve the thermal distribution of sintering bed and reduce the solid fuel consumption as well as emission of pollution. Effects of injecting H2O(g) towards sintering bed on the sintering indexes have been clarified so that the appropriate method and regions of injecting H2O(g) have been obtained,all of which realized the reduction of CO. Technology of sintering under the gas medium of energy-containing and multiple-component for pollution reduction has been proposed. Appropriate method of coupling and injecting two typical gases,namely fuel gas and steam,has been explored,which helped to improve the sintering indexes,to save the energy and reduce the pollution emission.
范晓慧, 甘敏, 季志云, 周志安, 周浩宇. 复合气体介质烧结的节能减排技术开发与应用[J]. 钢铁, 2020, 55(8): 62-69.
FAN Xiao-hui, GAN Min, JI Zhi-yun, ZHOU Zhi-an, ZHOU Hao-yu. Development and application of techniques for energy conservation and emission reduction during sintering process based on multiple-component gases medium[J]. Iron and Steel, 2020, 55(8): 62-69.
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