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随着重油催化裂化装置处理量的提高,提高产品总液收已成为亟待解决的问题,因此针对装置加工原料和相关操作参数进行了优化调整。利用减压侧线油掺混到催化原料中,掺混比例控制在15%～20%(质量分数),使原料残炭值明显降低,保持在5%以下,同时铁、镍、钒等重金属含量均有所降低。最佳催化剂微反活性控制在64～68之间,相应提升管出口反应温度控制在513～515℃之间。采用活性和稳定性更好的LDO-75型催化剂代替原来的LVR-60R型催化剂,解决了催化剂跑损问题。运行结果表明,产品总液收均值达到83.74%,较优化调整前提高2.94个百分点,其中汽油收率提高2.45个百分点,柴油收率降低0.03个百分点,液化气收率提高0.52个百分点;反应生焦率均值降低1.63个百分点,油浆产率均值降低1.01个百分点,干气产率降低0.3个百分点;2011年装置新增产值4238万元。
With the improvement of the throughput of heavy oil catalytic cracking unit and the improvement of the total liquid production, it has become an urgent problem to be solved. Therefore, the equipment processing raw materials and related operating parameters are optimized and adjusted. The use of low-pressure side oil blending into the catalytic raw materials, blending ratio control in 15% to 20% (mass fraction), so that the raw carbon residue significantly decreased, maintained below 5%, while iron, nickel, vanadium and other heavy metal content Are reduced. The best catalyst micro-activity control in between 64 ~ 68, the corresponding riser exit reaction temperature control between 513 ~ 515 ℃. Replacing the original LVR-60R catalyst with LDO-75 catalyst with better activity and stability has solved the problem of catalyst running loss. The operation results showed that the average value of total liquid product collection reached 83.74%, 2.94 percentage points higher than that before optimization and adjustment, with the gasoline yield increasing 2.45 percentage points, the diesel yield decreasing 0.03 percentage point and the liquefied gas yield increasing 0.52 percentage point. The average value of coke rate decreased by 1.63 percentage points, the average slurry productivity decreased by 1.01 percentage points, and the dry gas production rate decreased by 0.3 percentage point. In 2011, the new plant output value increased by 42.38 million yuan.