1.7Mt/a渣油加氢装置超长周期运行分析

中国石化长岭分公司1.7 Mt/a渣油加氢装置已成功运转了4个周期，第一周期通过采用相应的技术手段，首次实现了高铁钙渣油加氢装置的长周期运转，第一周期共运转了426天，第二周期较第一周期运转时间更长，为471天；第三周期由于全厂大检修，运转了326天。第四周期在前3个周期运转经验的基础上，通过优化催化剂级配、掺炼催化裂化循环油和优化原料性质，实现了693天的超长周期运转。与第二周期相比，1.7 Mt/a渣油加氢装置第四周期尽管减压渣油的掺入比例降低，但装置的主要加工指标如总加工量、减压渣油加工量、催化剂的利用率和催化剂的杂质脱除率均较第二周期高。

ANALYSIS FOR SUPER LONG-TERM RUNING OF 1.7 Mt/a RHT UNIT IN CHANGLING COMPANY

A residual oil hydrotreating unit in SINOPEC Changling Company successfully ran for four cycles. The first cycle ran for 426 days, processing residue with high content of iron and calcium; the 2nd cycle was up to 471 days. Due to the overhaul, the 3rd cycle only worked for 326 days. By optimizing catalysts grading, blending LCO and decreasing VR ratio, the fourth cycle was even longer, as long as 693 days. Compared with the second cycle, the total amount of feed and VR processed, utilization efficiency of the catalyst, and the impurities removal rate in the fourth cycle were all higher, thought the blending ratio of VR was less than in the former.