350×10^(4)t/a两段全循环柴油加氢裂化装置标定分析

Performance Test Analysis of 3.5Mt/a Two-stage Full Cycle Diesel Hydrocracking Unit

浙江石油化工有限公司350×10^(4)t/a柴油加氢裂化装置采用UOP两段式全转化加氢裂化UnicrackingTM技术,一段反应器装填催化剂为HYT-6219加氢精制催化剂、HC-680LT加氢裂化催化剂和少量HYT-8119加氢脱金属剂,二段反应器装填HC-53LT加氢裂化催化剂,两台反应器上部均装填Cattrap-30、Cattrap-50保护剂。该装置是目前国内最大的两段全循环柴油加氢裂化装置,于2021年9月下旬开工后,持续一直满负荷、稳定运行。经过标定,100%负荷时,目标产品重石脑油收率为64.63%,低于设计参考值;脱硫后液化气收率为15.96%,高于设计参考值;轻石脑油收率为21.29%,高于设计参考值;综合能耗为41.22kg标油/t原料,低于设计参考值10.64kg标油/t原料;氢耗为3.36%,略高于设计参考值;二段反应器催化剂床层温升高于设计参考值;各设备运行稳定,未出现超负荷现象;脱硫后干气、脱硫后低分气、脱硫后液化气、轻石脑油、重石脑油和少量柴油产品质量均达标到标准要求。

The 3.5Mt/a diesel hydrocracking unit at Zhejiang Petrochemical Co.,Ltd.adopts UOP two-stage full conversion Unicracking~(TM)technology.The first stage reactor is loaded with HYT-6219 hydrorefining cata-lyst,HC-680LT hydrocracking catalyst and a small amount of HYT-8119 hydrodemetallization catalyst,the second stage reactor is loaded with HC-53LT hydrocracking catalyst,and Cattrap-30 and Cattrap-50 protectants are loaded into the upper part of both reactors.This unit is the largest two-stage full cycle diesel hy-drocracking unit in China.It has been operated stably at full load since it was started up in late September 2021.After performance test,the yield of target product heavy naphtha is 64.63%at 100%load,lower than the design reference value.The yield of desulfurized liquefied gas is 15.96%,higher than the design reference value.The yield of light naphtha is 21.29%,higher than the design reference value.The comprehensive energy consumption is 41.22kgEO/t of raw material,10.64kgEO/t of raw material lower than the design reference value.The hydrogen consumption is 3.36%,slightly higher than the design reference value.The temperature rise of catalyst bed in the second stage reactor is higher than the design reference value.The equipment runs stably without overload.The quality of desulfurized dry gas,desulfurized low-pressure separator gas,desulfurized liquefied gas,light naphtha,heavy naphtha and a small amount of diesel oil is up to standard.