湛江东兴气体分馏装置流程模拟应用

The Application of Process Simulation Technology in Sinopec Zhanjiang Dongxing Petrochemical Co.′s Gas Fractionation Unit

以湛江东兴石化公司10×104t/a气体分馏装置为实施对象,运用Aspen Plus软件,以装置实际操作数据作为基础数据,建立气分装置流程模拟模型。利用模型和软件的灵敏度分析等功能,对脱丙烷塔、脱乙烷塔、精丙烯塔进行模拟分析,指导装置生产,实现装置优化、增效。2009年,根据模拟结果,对脱丙烷塔进行降温降压调整,结果显示:调整后脱丙烷塔顶压力从1.81MPa降至1.50MPa,塔底温度由104℃降至95℃,节约蒸汽0.6t/h,气分装置能耗下降3.8kg标油/t,测算可产生经济效益103.68万元。根据模拟结果,同时对脱丙烷塔、脱乙烷塔、精丙烯塔的回流量进行调整(降低),其中脱丙烷塔顶回流量由13.3t/h降至8.8t/h。另外,通过对脱丙烷塔降温降压操作的成功应用,可推及丙烯塔的操作中,如在催化裂化装置分馏塔低温热供给负荷较低时,可对丙烯塔进行降温降压操作,达到节能的效果。

With the help of the Aspen Plus software,technicians established a gas separator process simulation model using the actual operating data from Sinopec Zhenjiang Dongxing Petrochemical Company′s 10×104t/a gas fractionation unit.Using the functions of the model and the software such as sensitivity analysis,these technicians analyzed the parameters of the depropanizer,the dethanizer and the fine propylene column with the aim of guiding production,optimizing unit performance and raising efficiency.In 2009,based on the simulation results,these technicians revised down the temperature and pressure for the depropanizer.The results of the optimization show that the pressure at the top of the depropanizer dropped to 1.50MPa from 1.81MPa,the temperature at the bottom of the depropanizer dropped to 95℃ from 104℃,steam savings amounted to 0.6t/h,energy consumption of the gas separator dropped by 3.8kg of oil equivalent per ton and that annual economic benefits from the optimization reached 1.0368 million yuan.Based on the simulation results,the refluxes in the depropanizer,the dethanizer and the fine propylene column were reduced.The reflux at the top of the depropanizer dropped to 8.8t/h from 13.3t/h.In addition,the successful experience in reducing temperature and pressure for the depropanizer can be extrapolated into the operation of the propylene column.For instance,when the low-temperature heat supply load is low in the fractionation column of the catalytic cracking unit,the temperature and pressure in the propylene column can be reduced to save energy.