硫磺回收尾气加氢反应活性下降的原因分析及采取的措施

分析了中化泉州石化有限公司硫磺回收Ⅱ列尾气处理单元试车阶段急冷塔系统、烟气SO2浓度和加氢反应系统出现的异常现象和原因,初步判断为加氢反应活性下降。探讨其活性下降的原因,并通过停工检查确认了主要原因为气体在加氢反应器床层产生了偏流。针对偏流现象产生的原因采取了有效的措施:对反应器入口分布器部分开孔封堵,在床层催化剂顶端装填瓷球筛网,调整反应系统的操作。实施措施再次开工后,反应器床层催化剂的偏流得到了有效抑制,加氢活性明显提高,确保了硫磺回收尾气处理单元各项操作指标正常。

ANALYSIS OF ACTIVITY DECLINE OF TAIL GAS HYDROGENATION CATALYST IN SULFUR RECOVERY SYSTEM AND COUNTMEASURES

The analysis indicates that the abnormal phenomena of quench tower, SO2 concentration in flue gas and hydrogenation system during the commissioning of No.2 tail gas treatment system for sulfur recovery is due to the activity decline of the hydrogenation catalyst. It is found that the reason for hydrogenation activity losing is due to the bias current in catalyst bed. Effective measures are then adopted, including sealing part of the reactor entrance opening, adding porcelain ball screen mesh at the top of the catalyst bed and adjusting the operation of the reactor system. The bias current in the catalyst bed is thus controlled effectively and the hydrogenation activity improves significantly by these measures, resulting in smooth operation of the tail gas system of the sulfur recovery unit.