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金陵石化1.50Mt/a加氢裂化装置采用单段串联部分循环加氢工艺,以直馏蜡油和焦化蜡油的混合油为原料,产品方案是最大量生产优质中间馏分油。该装置2014年11月停工更换催化剂,精制段采用FF-26精制剂,而裂化段首次应用FC-16B级配FC-14组合裂化剂。在装置满负荷运行期间,精制反应器入口温度不断提高,而温升却在下降,重石脑油和尾油的硫、氮含量逐渐增高,说明精制剂活性下降,而随着裂化温度的提升,产品液体收率逐渐增加,中间馏分油整体收率未有明显变化,但航煤和柴油的液体收率比却不断下降,说明裂化剂的活性和选择性降低。变压器油的倾点逐渐升高,证明级配裂化剂的异构性能逐渐降低。在一定范围内,通过提高精制和裂化反应温度,虽能补偿精制催化剂活性的衰减,但级配催化剂的裂解和异构化能力却不能恢复,导致目标产品收率降低、能耗增加,装置盈利能力下降。针对延缓FC-16B级配FC-14催化剂失活、提高装置运行时间等问题,提出建议。
Jinling Petrochemical 1.50Mt / a hydrocracking unit using a single series of part of the cycle of hydrogenation process to straight-run wax oil and coker gas oil mixture as raw material, the product program is the largest production of high quality middle distillate. The unit was shut down in November 2014 to replace the catalyst, FF-26 was used in the refining section, and FC-16B with FC-14 was used in the cracking section for the first time. During the full load operation of the device, the inlet temperature of the refined reactor continuously increases while the temperature rise decreases. The sulfur and nitrogen contents of the heavy naphtha and the tail oil gradually increase, indicating that the activity of the refined product decreases. With the increase of the cracking temperature, The liquid yield of the product increased gradually while the overall yield of the middle distillate did not change significantly. However, the liquid yield ratio of jet fuel and diesel oil kept decreasing, which indicated that the activity and selectivity of the cracking agent decreased. The pour point of transformer oil gradually increased, proving that the isomerization performance of the cracking agent was gradually reduced. Within a certain range, although the activity of the refined catalyst can be compensated for the degradation by increasing the refining and cracking reaction temperature, the cracking and isomerization ability of the upgraded catalyst can not be recovered, resulting in the decrease of the yield of the target product, the increase of the energy consumption and the profitability of the device Decrease in ability. In order to delay the deactivation of FC-16B grade FC-14 catalyst and improve the running time of the equipment, some suggestions are put forward.