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块煤的高温粉化是限制CCREX高效生产的主要因素之一,采用试验和理论结果分析了块煤在熔融气化炉内的高温粉化规律及关键控制因素。通过块煤的高温模拟成焦和热重试验,分析了块煤高温强度的演变与气化动力学规律,在建立传热与块煤性质、粉化行为关系的基础上,提出了抑制块煤高温粉化的方法。研究结果表明,在块煤平均温度达到700℃之前,总吸热比例已达到80%,而煤焦转化率仅增加了30%,此时高温强度小于30%,起始气化温度和气化活化能很低,属于快速粉化阶段。后期吸热量每增加10%,转化率可增加20.4%,其反应性及裂变强度分别降低8.36%和增加7.75%,气化活化能大于230 k J/mol,属于慢速粉化阶段。因此,前期传热是COREX炉内块煤粉化的限制性因素。
High-temperature pulverization of lump coal is one of the main factors that limit the efficient production of CCREX. Based on the experimental and theoretical results, the high-temperature pulverization and the key control factors of lump coal in the fusing gasifier are analyzed. Based on the simulation of coke and thermal gravimetric tests of lump coal, the evolution of high temperature strength and the kinetics of gasification were analyzed. Based on the relationship between heat transfer and lump coal properties and pulverization behavior, High-temperature chalking method. The results show that before the average coal lump coal temperature reached 700 ℃, the total endothermic proportion reached 80%, while the coal tar conversion rate increased by only 30%, and the high temperature strength was less than 30%. The initial gasification temperature and gasification activation Can be very low, belonging to the rapid pulverization stage. For every 10% increase in the endotherm, the conversion rate increases by 20.4% and the reactivity and the fission strength decrease by 8.36% and 7.75%, respectively. The gasification activation energy is more than 230 kJ / mol, which belongs to the slow pulverization stage. Therefore, the heat transfer in the previous stage is a limiting factor for coal pulverization in the COREX furnace.