运用过程模拟模型提升常减压及焦化联合装置轻油收率

Application of simulation model to improve light oil yields of crude distillation and delayed coking complex

介绍了某炼油厂在保证汽油、柴油混合加氢精制装置产品质量的前提下,针对常减压装置的常一线油终馏点控制在235~245℃,作为生产航煤的原料;汽油、柴油混合加氢精制装置产出的加氢石脑油终馏点控制在150~160℃,以降低连续重整装置进料量;延迟焦化装置按1.8大循环比操作,不产出蜡油的运行工况,利用R-SIM全流程优化平台,开发了常减压、焦化联合装置和汽油、柴油混合加氢精制装置的过程模拟模型,实现对以上3种装置的全流程工艺计算。经计算,调整常二线油和延迟焦化柴油的95%点馏出温度的配比关系,将常二线95%点馏出温度控制在365~375℃,焦化柴油95%点馏出温度控制在360~365℃,可提高常减压、延迟焦化联合装置的轻油收率0.67百分点,经济效益显著。

In a refinery,the high-quality diesel and gasoline are produced by gasoline-diesel hydotreating unit. The end point of 1st atmospheric sidedraw of atmospheric-vacuum distillation unit is controlled within235 ~ 245 ℃ to be used as the feedstock for the production of jet fuel; The end point of hydrotreated naphtha from gasoline and diesel hydortreating unit is limited within 150 ~ 160 ℃ so as to reduce the feed rate of continuous catalytic reformer; The delayed coker is operated at a large circulation ratio of 1. 8 so as not to produce wax oil. The R-SIM process flow optimization platform is utilized to develop simulation models for the process calculations of the atmospheric-vacuum distillation and delayed coking complex and gasoline diesel hydrotreating unit. Based upon the simulation calculations,the 95% distillation point temperatures of atmospheric2 nd sidedraw and delayed coker diesel are adjusted. The 95% distillation point temperature of atmospheric2 nd sidedraw is controlled within 365 ~ 375 ℃ and that of delayed coker diesel is limited to 360 ~ 365 ℃. As the result,the light oil yield of atmospheric-vacuum distillation unit is improved by 0. 67 percentage and economic benefit is significant.