固定床催化反应器中平行反应的飞温现象 Ⅱ冷却介质温度沿反应器轴向变化  

RUNAWAY PHENOMENON FOR PARALLEL REACTIONS IN FIXED BED CATALYTIC REACTORS Ⅱ CHANGING TEMPERATURES OF THE COOLING MEDIUM

作　　者：吴鹏[1] 陈建新[1] 廖晖[1] 李绍芬[1] 

机构地区：[1]天津大学化工学院,天津300072

出　　处：《化学反应工程与工艺》1999年第4期337-342,共6页Chemical Reaction Engineering and Technology

基　　金：天津市青年科学基金!(953705211);中国石化总公司基金!(G593015)

摘　　要：对冷却介质温度沿反应器轴向变化时平行反应的飞温现象进行了研究，揭示出临界等浓度曲线拐点是冷却介质温度沿轴向变化时反应系统发生飞温的临界点。研究结果表明冷却介质对反应系统飞温区域的影响和反应物料与冷却介质的热容量之比α有关，α越大反应系统的飞温区域越大，得到的飞温区域上下限之间的差异也越明显。In this paper, the runaway phenomenon for parallel reactions in fixed bed catalytic reactors has been studied in detail when cooling medium temperature is fixed. An upper limit of operating temperatures and a runaway criterion were obtained for safe operations. The research results showed that the runaway theory of single reactions is also fit to parallel reactions. It was also founded experimentally that the discrepancy of runaway regions between parallel and single reactions depends on the rate and enthalpy of the desired and the undesired reactions. For parallel reaction systems, whether or not the undesired reactions are neglected, should not only consider the rate of the undesired reaction, but also the enthalpy of the undesired reactions.

关 键 词：固定床 催化反应器 平行反应 飞温 冷却介质 

分 类 号：TQ052.07[化学工程]