SC-1型石脑油裂解炉全周期操作优化研究

Study on operational optimization of SC-1 type naphtha cracking furnace in full period

基于Kumar分子反应动力学模型,以全周期平均乙烯收率为目标函数,每个拟稳态时段的炉管出口温度(COT)为决策变量,建立了石脑油裂解炉全周期操作优化模型。利用开发的乙烯裂解炉模拟优化系统(EPSOS 2.0)和全周期操作优化模型,结合中国石油兰州石化公司46万t/a乙烯装置SC-1型石脑油裂解炉的操作现状,对该裂解炉进行了全周期模拟优化研究。结果表明,全周期COT最优化控制方案为前23 d在最高裂解温度875℃下运行,然后逐渐降低至855℃;与操作基准方案(全周期COT均为865℃)相比,优化后裂解炉的全周期平均乙烯收率提高0.56个百分点,三烯(乙烯、丙烯和丁二烯)收率提高0.60个百分点。

Based on Kumar molecular reaction dynamics model,the full period operational optimization of the naphtha cracking furnace was established by taking the average ethylene yield in full period as objective function and the coil outlet temperature（ COT） at each of the quasi steady state period as decision variables. With the self- developed ethylene pyrolysis simulation optimization system（ EPSOS） 2. 0 version and full period operational optimization model,combining the operation situation of SC- 1 naphtha cracking furnace in a 0. 46 Mt / a ethylene unit of Lanzhou Petrochemical Company,Petro China,simulation and optimization research of the cracking furnace in the full period operation was conducted. The results showed that the optimization scheme of COT control was at the highest pyrolysis temperature of 875 ℃ before 23 d,and then gradually decreased to 855 ℃. Compared with opreation basis scheme（ COT at 865 ℃ in full period）,the average ethylene yield in full period increased by 0. 56 percent points,and the sum of the average ethylene,propylene and butadiene yield increased by 0. 60 percent points after optimization.