连续重整装置流程模拟及优化

Process Simulation and Optimization for Continuous Catalytic Reformers

以中国石化青岛炼油化工有限责任公司150t/a连续重整装置为研究对象,采用Aspen Plus流程模拟软件,建立了催化重整装置及重整后分馏部分与实际工况相吻合的稳态流程模拟模型。利用此模型,对重整装置的汽提塔、石脑油分馏塔、脱异戊烷塔、脱戊烷塔、脱丁烷塔、脱C6塔、脱甲苯塔、二甲苯塔进行了综合分析。以节能和经济效益最大化为目标,分别对汽提塔、石脑油分馏塔、脱C6塔、脱甲苯塔和二甲苯塔进行了操作参数优化。连续重整装置优化后,共计节约燃料气300m3/h(标准)、N2(0.7MPa)88m3/h(标准)、1.0MPa蒸汽4t/h,创造节能效益780.36万元/a。同时,脱C6塔底油中苯含量由1.2%下降为0.2%,多回收苯1t/h;二甲苯收率由19.01%提高至19.85%,二甲苯产量增加1.5t/h,按照苯、二甲苯与汽油差价折算,创造效益3360万元/a。两项效益合计为4140.36万元/a。

Based on the 150t/a continuous catalytic reforming unit in SINOPEC Qingdao Refining Corp., Ltd,researchers at the company established a stationary-state process simulation model using process simulation software Aspen Plus,in which the operating conditions of the catalytic reformer and the fractionating section after reforming are identical to the actual working conditions.These researchers carried out a comprehensive analysis of components of the reforming unit including the stripper,naphtha fractionator,isopentane-removing tower,pentane-removing tower,butane-removing tower,C6-removing tower,toluene-removing tower and xylene tower.To save energy and maximize economic benefits,they optimized operating parameters for the stripper,naphtha fractionator,C6-removing tower,toluene-removing tower and xylene tower.After the parameter opti-mization,a total of 300m3/h （at standard atmospheric pressure） of fuel gas,88m3/h of N2 （at 0.7MPa） and 4t/h of steam （at 1.0MPa） were saved,equivalent to generating 7.8036 million Yuan in revenue per year.In addition,the content of benzene in the oil at the bottom of the C6 removing tower dropped to 0.2% from 1.2% .The amount of benzene recovered from the oil reached 1t/h.The recovery of xylene rose to 19.85% from 19.01% and xylene output rose by 1.5t/h.If calculations are based on the difference between the prices of benzene,xylene and gasoline,the recovery of benzene and xylene could generate an additional 33.6 million Yuan in revenue per year.The combined benefits from the optimization to the unit could reach 41.4036 million Yuan per year.