MRC工艺中混合冷剂设计参数与配比的优化  

Optimization of operation parameters and the ratio of mixed refrigerant in process of mixed refrigerant cycle

作　　者：杨鑫磊[1] 范代娣[1] 员汝娜 张旭[1] 巨建鹏 李稳宏[1] YANG Xin-lei;FAN Dai-di;YUAN Ru-na;ZHANG Xu;JU Jian-peng;LI Wen-hong(School of Chemical Engineering,Northwest University,Xi＇an 710069,Shaanxi Province,China)

机构地区：[1]西北大学化工学院,陕西西安710069

出　　处：《化学工程》2018年第1期1-6,20,共7页Chemical Engineering(China)

摘　　要：为了降低天然气液化厂冷剂用量以达到节能降耗的目的,文中通过响应面分析法对中、高压制冷剂的运行工艺参数进行优化,在此基础上,采用Aspen HYSYS软件中的序贯二次程序法对冷剂配比进行了优化,得到了冷剂的最佳工艺参数和最优混合冷剂配比。结果表明:冷剂的最佳工艺参数为中压冷剂压力1 890 k Pa,高压冷剂压力3 800 k Pa,中压冷剂温度36℃,高压冷剂温度36℃,预测的最小单位能耗为391.104 k W·h/t,并通过现场实际生产验证了其可靠性。最优的冷剂摩尔配比为:N_27.0%,CH_425.0%,C_2H_432.4%,C_3H_818.7%,i-C_5H_(12)16.9%。在混合冷剂最优条件下,天然气液化装置中冷量利用率提高16.56%,冷剂循环量较优化前降低12.86%,生产每t液化天然气能耗降低7.61%。In order to reduce the amount of refrigerant and save energy in the liquefied natural gas plant,the process parameters of medium and high pressure refrigerant were optimized by response surface methodology. On this basis,the refrigerant ratio was optimized by sequential quadratic programming method in Aspen HYSYS software. The optimal process parameters and the ratio of mixed refrigerant were obtained. The results show that the optimal process parameters are as the followings： medium pressure refrigerant pressure of 1 890 k Pa,high pressure refrigerant pressure of 3 800 k Pa,medium pressure refrigerant temperature of 36 ℃,high pressure refrigerant temperature of 36 ℃,and the minimum energy consumption is predicted 391. 104 k W · h/t and is verified the reliability by the actual production on site. The optimal ratio of mixed refrigerant is as the followings： N27. 0%,CH425. 0%,C2 H432. 4%,C3 H818. 7%,i-C5 H（12）16. 9%. Under the optimum conditions of mixed refrigerant,the utilization rate of refrigerant in natural gas liquefaction plant is rose by 16. 56% and before optimization the refrigerant circulation quantity is reduced by 12. 86%,energy consumption per ton of liquefied natural gas is reduced by 7. 61%.

关 键 词：天然气 液化装置 响应面分析法 冷剂配比 

分 类 号：TQ646[化学工程—精细化工]