重整催化剂水氯平衡的控制

Control of chlorine water balance for reforming catalyst

结合中国石油青海油田格尔木炼油厂15万t／a重整装置使用PRT—C／PRT—D催化剂的生产实际，分析并总结了常见的水氯平衡判断与调节方法及注意事项。结果表明，系统压力、重整原料油中环烷基含量决定系统的含水量；在温度、压力稳定，重整原料含水质量分数为（5～9）×10^-6的条件下，水氯平衡的调节可只对氯含量进行，但切忌长时间过湿操作，或瞬间水冲击催化剂；在实际生产中对水氯平衡的判断主要看反应器温降（特别是第四反应器）、稳定汽油辛烷值、重整循环氢纯度以及φ（碳-）／φ（碳-＋碳二＋碳三）和φ（碳三）／φ（碳一）值，当出现较大异常现象时，应首先分析重整原料的氯含量；在水氯平衡调节中，应在降温下补氯补到微过量，然后以1℃的幅度提温调节；对水氯平衡的调节应考虑多因素，绝不能盲目地提温，且如果长时间达不到预期目标，应降温处理。

The normal judgment, the adjustment methods and the attention issues of regulating chlorine water balance were analyzed and summarized in combination with the production practice of using catalyst PRT - C/PRT - D in 150 kt/a reforming unit of Golmud Refinery of Qinghai Oilfield Company. The results showed that the system moisture depended on the system pressure and the cyclo - alkyl content of reforming feedstock. Under the conditions of stable temperature, pressure and the moisture mass fraction of reforming feedstock （5 - 9）×10^ 6, the chlorine water balance regulation could be performed by adjusting the chlorine content alone, but prohibiting the operation in an excessively wet condition for long period or the catalysts＇ impacting by water instantaneously. The judgments of chlorine water balance in the production practice mainly depended on the temperature decrement of reactors, specially the fourth one, the octane number of stable gasoline, the purity of circulation hydrogen and the volume fractions of C1 to （C1 ＋ C2 ＋ C3） ,C3 to C1. Once the seriously abnormal phenomenon happened, the first thing should be to analyze chlorine content of reforming feedstock. For the adjustment of chlorine water balance, the chlorine should be added under the condition of reducing reactor temperature and a little overloading,then warmed by the adjustment increment of 1℃. For the regulation of chlorine water balance, more influential factors should be considered and should not raise the temperatures of reactors unrealistically. If the expected aim could not be carried out for long time, the treatment of decreasing reactor temperature should be taken.