芳烃型催化重整操作条件的分析及优化

ANALYSIS AND OPTIMIZATION OF OPERATION CONDITIONS FOR AROMATIC TYPE CATALYTIC NAPHTHA REFORMING

在催化重整27集总反应动力学模型的基础上,分析了移动床连续重整4个反应器的进口温度、催化剂使用时间、空速及氢/烃摩尔比等7个操作变量对反应的影响,同时以芳烃产率为目标函数对操作参数进行了优化。各反应器进口温度对反应的影响由大到小的顺序为第4反应器进口温度、第3反应器进口温度、第2反应器进口温度、第1反应器进口温度。优化后的第1～4反应器进口温度分别为502.93、505.71、520.78和537.02℃,经优化计算芳烃产率可提高0.98%,二甲苯产率可提高1.34%,氢气产率也略有增加。该操作条件分析及优化结果可为芳烃型重整装置的优化操作提供参考。

Abstract： Based on the 27-lumped kinetic model of catalytic naphtha reforming, the influences of seven operation variables, including inlet temperatures of four reactors, service time of catalyst, LHSV and molar ratio of hydrogen to hydrocarbon （n（H2）/n（Hydrocarbon））, were analyzed for continuous reforming moving-bed redial-flow reactor. The optimization of operation variables was carried out to obtain the maximum aromatic yield. The influence of the inlet temperatures of four reactors in catalytic naphtha reforming unit on the product yields was in the order, from strong to weak, of 4th reactor, 3rd reactor, 2nd reactor and 1st reactor. The optimum inlet temperatures of four reactors were 502.93, 505.71, 520.78 and 537.02℃, respectively. After optimization, an aromatic yield increase of 0.98%, a xylene yield increase of 1.34% and slight hydrogen yield increase were obtained. The analysis and optimization of operation conditions can provide a basis for optimization of reforming unit to produce aromatics.