【摘要】 近年来,氧热法制电石工艺因相对电热法的明显优势而受到关注.为了设计适用该工艺的反应器,本文建立了包括热解动力学以及热传递效应的复合颗粒热解模型,通过模拟分别考察了单一组成球形颗粒(包括煤、氢氧化钙和碳酸钙)以及煤与氢氧化钙或碳酸钙组成的双组分复合颗粒在高温气流中的热解.基于模拟结果发现,氧热法制电石反应器宜采用氢氧化钙为钙源、烟煤和氢氧化钙以拟均相结构组成复合颗粒.颗粒热解过程中,氢氧化钙的热解吸热作用>烟煤的热解吸热作用>挥发分蒸发吸热作用,且挥发分蒸发吸热作用可以忽略;热解速率的相对重要性次序为内热阻>外热阻>反应动力学.更多还原

【Abstract】 CaC₂ production via oxygen-thermal heating by combustion of coals or chars presents advantages over the conventional electro-thermal process and is increasingly gaining interest for effective use of carbon resources. In this investigation, with a particular focus on the reactor design aspect of the oxygen-thermal process, a one-dimensional unsteady pyrolysis model of bituminous coal-calcium containing composite pellets is established to describe the coupled external and internal heat transfer and decomposition rate steps. It is demonstrated by simulation that calcium hydroxide is a suitable calcium source and preferably used in a pseudo-homogeneous composite form with coal; in decomposition,the endothermic effect of calcium hydroxide is greater than that of the coal, and the endothermic effect of evaporation can be ignored; the relative importance of the involving rate steps is in the order of internal thermal resistance > external thermal resistance> reaction kinetics.更多还原