EBHP分解飞温模型建立及控制分析

对乙苯过氧化氢(EBHP)分解构建了飞温模型,绘制有冷却和无冷却体系两种工况的飞温曲线,分析了乙苯注入、紧急冷却水通入措施对飞温的抑制作用。工艺模拟试验结果表明:该EBHP飞温模型能较好预测温度随时间的变化情况,认定120℃为系统报警温度值,140℃为系统联锁值。以某63/30万t/a的苯乙烯/环氧丙烷(SMPO)装置为例,假定EBHP进料量为1000 t/h,用EBHP飞温模型核算,乙苯注入量(w)为30%的进料量时、或者紧急冷却水通入量(w)为进料量的6.5%时,系统均能快速终止飞温,且效果明显。这一研究结果为装置的安全设计和稳定运行提供了依据。

CONSTRUCTION OF TEMPERATURE RUNAWAY MO-DEL FOR EBHP DECOMPOSITION REACTION AND THE CONTROL ANALYSIS

Temperature runaway model was built for EBHP decomposition,and temperature runaway curves were drawn for two working conditions,i.e.,with or without cooling system.The inhibiting effect of EB flush and emergency cooling water quench on temperature runaway was analyzed.The results showed that the EBHP temperature runaway model could predict the change of temperature with time.The temperature alarm value was 120℃and the interlock temperature was 140℃.A 630/300 kt/a SM/PO unit was taken as the example,and the EBHP flow rate was assumed to be 1000 t/h.The temperature runaway could be inhibited rapidly and effectively when the EB flow rate was equal to 30%of the feed or the emergency cooling water flow rate was equal to 6.5%of the feed.This research has provided basis and reference for the safety design and stable operation of the unit.