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Effects of single lance configuration on coal combustion process in tuyere from viewpoint of coal plume

Journal of Iron and Steel Research International 2021年第7期28卷 785-798页

作者： Yun-hua Zhou Ping Zhou Jia-yun Dan Hong-jie Yan Dong-ling Wu Valin Xiangtan Iron and Steel Corporation Xiangtan 411101HunanChina School of Energy Science and Engineering Central South UniversityChangsha 410083HunanChina

Pulverized coal utilization in the blast furnace is decided by the particle flow and combustion behaviors in the *** a specific operating condition,these behaviors are directly related to the lance configuration in the upstream tuyere *** on single straight lance,six types of single lance configurations were designed by assembling four parameters in different *** four parameters are the lance diameter,lance insertion angle,and the horizontal and vertical distances from the lance tip to the tuyere *** different lance configuration schemes applied,the pulverized coal combustion process in the lance-blowpipe-tuyere zone was *** simulation results regarding particle diffusion and combustion behaviors were characterized by three indicators from the viewpoint of a coal *** are the plume diffusion angle,diffusion uniformity,and the average plume temperature at the tuyere *** promote coal utilization,the values of these indicators under different configurations were analyzed,yielding two optimal *** first one is to reduce the lance length immersed in the blowpipe-tuyere by 100 *** other is to increase the horizontal distance from the lance tip to the tuyere outlet by 50 mm,and the insertion angle to 11° with the lance tip located at the tuyere *** findings can enhance the understanding of the influence mechanism of lance con-figuration on the coal utilization and provide guidelines for the design of new lance configurations.

关键词： Pulverized coal plume Particle dispersion lance configuration Blast furnace

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