Discussion of lump coal/char properties with its disintegration in COREX process
LIU Qi-hang1，WU Keng2，DU Rui-ling2，LI Xiao-ming1
（1. School of Metallurgical Engineering， Xi’an University of Architecture and Technology，Xi’an 710055，Shaanxi，China 2. School of Metallurgical and Ecological Engineering，University of Science and Technology Beijing， Beijing 100083，China）
Abstract：The disintegration of lump coal is one of the most crucial limiting factor for COREX production. The law and the key control factors for lump coal disintegration in melting gasifier were analyzed by experiment and theoretical results. Coking and TG experiment were conducted to determine the evolution of lump coal’s high temperature strength and gasification kinetics， then the method to avoid the pulverization of lump coal was proposed based on the establishment of the relationship between heat transfer and lump coal’s disintegration. According to the results， the heat absorption ratio of lump coal accounted for 80% before the average temperature of lump coal reached 700 ℃， and the coal/char conversion only increased by 30%. Then the fast generation of lump coal fines at this stage appeared due to the low strength less than 30%， as well as the low initial gasification temperature and activation energy. At later coking stage， the coal/char conversion could increase by 20.4% with the heat absorption increased by every 10%， and the reactivity decreased by 8.36% and the fission strength increased by 7.75%. What’s more， the gasification activation energy was more than 230 kJ/mol which could be considered as the low disintegration of lump coal. As the results， the heat transfer at early stage is the limiting factor for the pulverization of lump coal in COREX.
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2016, Vol. 51 
