连续重整装置粉尘累积问题的探讨

DISCUSSION ON DUST ACCUMULATION IN CONTINUOUS REFORMING UNIT

中国石化上海高桥分公司0.6 Mt/a连续重整装置运转过程中出现第一反应器(一反)温降明显下降、催化剂粉尘量大幅增加、还原区上部料位和下部还原温度大幅波动等异常现象。分析认为,催化剂粉尘在系统中的累积是重要原因之一,加上还原区料位偏低(45%~50%),引发还原区内催化剂流化并产生大量粉尘,使下料管中催化剂移动受阻;一反顶部催化剂缺失,反应物料短路,引起反应温降大幅下降。采取提高还原区料位、加强催化剂粉尘的淘析操作、适当调整各反应器温度等技术措施后,生产趋于平稳,在装置受到流量冲击后,一反温降逐渐恢复。

In the operation of a continuous reforming unit with 0.6Mt/a capacity of SINOPEC Gaoqiao Petrochemical Company,the reaction temperature drop of the first reactor was decreased,the amount of catalyst dust greatly increased,and the abnormal fluctuations of the level of catalyst in the upper part of the reduction zone and the reduction temperature in the lower part of the reduction zone occurred.The analysis shows that the accumulation of catalyst dust in the system is one of the important reasons,and the low material level of the reduction zone（45%-50%）leads to the fluidization of the catalyst in the reduction zone and large amount of dust,which blocks the catalyst movement in the delivery pipe,resulting in catalyst missing at the top of the first reactor,short-circuiting of reaction materials and a significant temperature drop reduction.After taking corresponding technical measures,like increasing the material level of the reduction zone,strengthening the catalyst dust elution operation and adjusting the reactor temperatures,the production is leveled off and the temperature drop is gradually restored.