氧热法电石合成的反应平衡和热匹配分析

针对氧热法电石合成中吸热的生成反应和放热的碳燃烧反应耦合,从热力学角度对电石生成途径、反应化学计量平衡以及吸、放热反应热耦合进行了分析。结果表明:(1)电石由CaO+3C→CaC2+CO一步直接生成的可能性更大;(2)不同化学计量对应4种不同反应体系,各体系电石平衡转化率都随温度升高而升高,随压强增大而减小,电石与氧化钙发生副反应的转化率大致为随温度升高而先升后降;(3)反应热匹配量和匹配条件取决于电石生成反应物料处理量和电石纯度要求。电石生成反应与燃烧供热反应耦合于同一反应器是可行的。

Thermodynamic analysis of calcium carbide synthesis and its thermal coupling with coke combustion

A thermodynamic analysis of the oxygen-heating calcium carbide synthesis process,where the endothermic calcium carbide synthesis is coupled with exothermic coke combustion,was conducted in order to select appropriate process conditions,in terms of reaction mechanisms,stoichiometry and heat coupling system.The results indicate that:(1) calcium carbide is most likely to be formed via a one-step mechanism(CaO+3CCaC2+CO);(2) Four different systems having different ratios of feedstocks were analyzed and showed common features in that the equilibrium conversion rate increased with an increase in temperature or a decrease in pressure,and the conversion of the side reaction proceeding with calcium carbide initially increased,and then decreased with increasing temperature;(3) The heat matching feeds and matching conditions depend on the throughput and the purity of calcium carbide;coupling calcium carbide synthesis with coke combustion in a reactor is feasible under appropriate conditions.