紧急泄压停工与复工对高压加氢裂化装置催化剂的影响

Effect of emergency pressure relief shutdown and resumption on catalysts in high pressure hydrocracking unit

对比了高压加氢裂化装置紧急泄压停工前与复工后精制反应器和裂化反应器的工况,以及产品收率与性质,考察了紧急泄压停工对催化剂的影响。结果表明:在紧急泄压停工过程中,启动2.1 MPa/min泄压不够及时,导致在0.7 MPa/min紧急泄压过程中,裂化反应器床层温度超标,而在复工过程中又由于小分子烃和烯烃存在,导致温度大幅超标;超温对精制催化剂的影响较小,而超温结焦导致裂化催化剂的选择性和活性均有所下降;复工时,为补偿催化剂失活,裂化反应器各床层平均温度提高了7.47℃。

The influence of emergency pressure relief shutdown on the catalysts were investigated through comparing the working conditions of the refining reactor and cracking reactor before and after the emergency pressure relief shutdown of the high pressure hydrocracking unit,as well as the product yields and properties.The results showed that in the process of emergency pressure relief shutdown,the start-up of 2.1 MPa/min pressure relief was not in time enough,which had resulted in cracking reactor bed temperature exceeding during the pressure relief of 0.7 MPa/min during the emergency pressure relief process.And in the process of unit resuming,the temperature had exceeded the standard temperature greatly due to the existence of small molecular hydrocarbons and olefins,the influence of over heat on the refining catalyst was small,but due to coking,the decrease of the selectivity and activity of cracking catalyst had occured.During the resumption of the unit,the average temperature of each bed in the cracking reactor had to increased 7.47℃to compensate for the catalyst deactivation.