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独山子石化1.2Mt/a延迟焦化装置采用循环比在0.2~0.6范围内、可调的循环油脱过热工艺,无法实现装置长周期低循环比运行,生焦率≥1.65,开展93.33%负荷(140t/h)时循环油外甩,低循环比运行标定,验证其经济效益。针对目前流程无法实现低循环比运行现状,提出“现有的重污油流程外甩循环油”、“现有的重蜡油流程外甩循环油”、“改造分馏塔底人字挡板,降低循环油上下回流量”、“循环油脱过热的可调循环比工艺改为蜡油脱过热的可调循环比工艺”等4种改造方法;对于下游二次加工装置原料劣质化问题,可根据下游日常监测分析,控制好重蜡油(循环油)掺炼比例;对于加热炉结焦倾向增大问题,可依据不同循环比油样相对结焦因子分析评价,选择循环比≥0.15,并辅以工艺操作控制;对于低负荷时加热炉分支进料流量低、系统物料少、操作波动大等问题,可在焦炭塔不同生产阶段,提前对分馏塔进行调整,防止大幅波动,必要时改加热炉单炉膛生产。改造后装置可实现低循环比运行。
Dushanzi Petrochemical 1.2Mt / a delayed coking unit with a circulation ratio in the range of 0.2 to 0.6, the adjustable circulating oil off the heat process, the device can not be achieved long cycle low cycle operation, raw coke rate ≥ 1.65, to carry out 93.33% load ( 140t / h) when the oil thrown outside the loop, low cycle ratio operation calibration to verify its economic benefits. In view of the current situation that the low cycle ratio operation can not be achieved, the proposal of “existing circulating oil for heavy oil process flow rejection” and “existing circulating recycle oil for heavy wax oil process” Herringbone baffle, reduce the circulation of oil up and down back flow “, ” cycle oil off the heat adjustable cycle than the process to wax off the heat cycle adjustable process "and other 4 kinds of transformation methods; for the downstream twice According to the downstream routine monitoring and analysis, the proportion of heavy wax oil (circulating oil) can be controlled well. For the problem of increasing the coke tendency of the heating furnace, the analysis can be based on the analysis and comparison of the relative coking factors of different oil samples, Circulation ratio ≥0.15, supplemented by process operation control; for low load heating furnace branch feed flow is low, the system less material, operating fluctuations and other issues, at different stages of the coke production tower, the fractionation tower adjusted in advance to prevent Fluctuations, if necessary, change the furnace single hearth production. After the transformation of the device can achieve low cycle ratio operation.