蜡油加氢裂化装置分馏系统优化研究

OPTIMIZATION OF FRACTIONATION SYSTEM IN VGO HYDROCRACKING UNIT

通过专业流程模拟软件建立了中海油惠州石化有限公司4.0 Mt/a蜡油加氢裂化装置分馏系统模型,对分馏系统展开综合性、系统性的分析与诊断,找出其不合理或存在优化空间的操作参数,提出并实施了降低主分馏塔塔顶压力、最大限度降低尾油循环返回分馏塔加热炉的流量、优化分馏塔的汽提蒸汽量等优化措施,提高了产品分馏的清晰度,增加了重石脑油、喷气燃料等高附加值产品的收率,提升了装置的经济效益。同时,对分馏系统进行能量综合优化,通过分馏塔降压操作与优化热量分配扩大了加热炉的负荷余地,克服加热炉负荷不足的瓶颈,提高装置的生产灵活性。

A model for 4.0 Mt a wax oil hydrocracking unit fractionation system of CNOOC Huizhou Petrochemical Company Limited is established by process simulation software. A comprehensive systematic analysis and diagnosis for the fractionation system was conducted to find out the unreasonable or operation parameter optimization space. Optimization measures are proposed and implemented such as reducing the pressure of the main fractionator,minimizing the flow of the recirculated tail oil to the furnace,and optimizing the stripping steam volume,resulting in improved the clarity of cutting,the separation of products,and the yield of high-value products such as heavy naphtha and aviation kerosene. The economic benefit of the unit is increased. At the same time,the energy of the fractionation system is comprehensively optimized. The load of the heating furnace is vacated through the reduction of operation pressure of the fractionation tower and the optimization of the heat distribution,which solves the bottleneck of insufficient heating furnace load and increases the production flexibility of the unit.