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目前,COREX流程中的熔融气化炉采用块煤代替焦炭作为燃料冶炼铁水。块煤在熔融气化炉中的反应行为对炉况的稳定顺行及铁水质量有着重要的影响。采用非等温热重分析法针对COREX用煤(大同煤)在热解过程中的失重速率、失重量以及影响因子进行了研究,分析了煤热解的整个失重过程,并讨论了不同升温速率对热解的影响。同时,考虑煤热解过程的不同特性,采用分段尝试法建立了煤热解过程的动力学理论模型,进而得到相应的动力学参数,有助于更好地分析块煤在气化炉内的热解行为,为COREX流程块煤的合理使用及采用风口喷煤技术提供理论依据。
At present, the melted gasifier in the COREX process uses lump coal instead of coke for fuel smelting of hot metal. The reaction behavior of lump coal in a melter-gasifier has an important influence on the steady state of the furnace condition and the quality of molten iron. The non-isothermal thermogravimetric method was used to study the weight loss rate, weight loss and influence factors of COREX coal (Datong Coal) during the pyrolysis process. The whole weight loss process of coal pyrolysis was analyzed and the effects of different heating rates Effect on pyrolysis. At the same time, taking into account the different characteristics of coal pyrolysis process, a piecewise attempt was used to establish the kinetic theoretical model of coal pyrolysis process, and then the corresponding kinetic parameters were obtained, which could help to better analyze the lump coal in the gasifier Pyrolysis behavior for the COREX process lump coal and the use of tuyere to provide a theoretical basis.