进料位置对双组分精馏过程耗能原因的分析
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摘要
利用Aspen Plus软件对正庚烷-正辛烷双组分物系的精馏过程进行模拟计算。通过灵敏度分析确定最小回流比和理论板数的基础上,考察精馏塔的进料板位置、回流比等因素对分离精度、塔内气液相组成、温度分布和能耗的影响,结果表明,固定总板数和进料板位置,随着回流比的增加,塔顶产品组成随之增加;回流比改变,最优进料板位置也会发生变化;在达到分离要求的情况下,随着进料板位置的下移,塔顶热负荷、塔底热负荷和总热负荷先降低后升高;在最优进料板进料时,进料气液相组成和温度分布与进料板上的气液相返混程度和温度返混最小,每块塔板均为有效板,具有较高的分离能力,此时能耗最小。
In this paper, the distillation process of n-heptane-n-octane is simulated and optimized by Aspen Plus software using the numerical simulation method. Firstly, the distillation of n-heptane and n-octane is calculated by simple calculation method. The minimum reflux ratio and theoretical plate number are determined by sensitivity analysis. Based on the above initial values, the RadFrac module is used to strictly calculate the column. The influence of the feed stage and the reflux ratio is studied on gas-liquid phase composition, temperature and heat duty in the column. The results show that the composition of the top product is changed with the increase of the reflux ratio in the case of fixed feed stage. The optimum feed stage changes with the increase of the reflux ratio. the heat load decreases first and then rises with the increase of the feed stage. When it is the optimal feed plate, heat load is minimal.
In this paper, the distillation process of n-heptane-n-octane is simulated and optimized by Aspen Plus software using the numerical simulation method. Firstly, the distillation of n-heptane and n-octane is calculated by simple calculation method. The minimum reflux ratio and theoretical plate number are determined by sensitivity analysis. Based on the above initial values, the RadFrac module is used to strictly calculate the column. The influence of the feed stage and the reflux ratio is studied on gas-liquid phase composition, temperature and heat duty in the column. The results show that the composition of the top product is changed with the increase of the reflux ratio in the case of fixed feed stage. The optimum feed stage changes with the increase of the reflux ratio. the heat load decreases first and then rises with the increase of the feed stage. When it is the optimal feed plate, heat load is minimal.
引文
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6 S Y Kim,M K Dong,B Lee.Process simulation for the recovery of lactic acid using thermally coupled distillation columns to mitigate the remixing effect[J].Korean Journal of Chemical Engineering,2017,34(5):1310-1318.
10 A Timoshenko,E Anokhina,O Akhapkina.Energy-Saving Hydrocarbon Distillation with Coupled Heat and Material Flows[J].Chemical Engineering&Technology,2016,39(12):2251-2264.
2叶启亮,朱明明,李玉安,等.节能环保型甲醇精馏装置的流程模拟与优化[J].天然气化工(C1化学与化工),2017,42(2):76-81.
3徐秀慧,李海明,周猛飞,等.甲醇制烯烃产品分离过程能效分析[J].计算机与应用化学,2017,34(11):868-874.
4刘志高,田硕,都健.多种基于Aspen Plus煤干馏工艺模型的建立及对比分析[J].计算机与应用化学,2018,35(3):175-180.
5苗剑,史高峰,王国英,等.基于Aspen Plus的聚甲氧基二甲醚精馏过程模拟分析[J].计算机与应用化学,2015,32(1):118-122.
7李鑫钢,郑艳梅.炼油分离过程大型化关键技术系统集成与节能[J].天津科技,2007,34(3):6-7.
8王毅,孙安琴,蔡旺锋.芳烃精制工艺模拟与节能优化[J].计算机与应用化学,2017,34(7):513-516.
9岳金彩,闫飞,邹亮,等.精馏过程节能技术[J].节能技术,2008,26(1):64-67.
6 S Y Kim,M K Dong,B Lee.Process simulation for the recovery of lactic acid using thermally coupled distillation columns to mitigate the remixing effect[J].Korean Journal of Chemical Engineering,2017,34(5):1310-1318.
10 A Timoshenko,E Anokhina,O Akhapkina.Energy-Saving Hydrocarbon Distillation with Coupled Heat and Material Flows[J].Chemical Engineering&Technology,2016,39(12):2251-2264.
2叶启亮,朱明明,李玉安,等.节能环保型甲醇精馏装置的流程模拟与优化[J].天然气化工(C1化学与化工),2017,42(2):76-81.
3徐秀慧,李海明,周猛飞,等.甲醇制烯烃产品分离过程能效分析[J].计算机与应用化学,2017,34(11):868-874.
4刘志高,田硕,都健.多种基于Aspen Plus煤干馏工艺模型的建立及对比分析[J].计算机与应用化学,2018,35(3):175-180.
5苗剑,史高峰,王国英,等.基于Aspen Plus的聚甲氧基二甲醚精馏过程模拟分析[J].计算机与应用化学,2015,32(1):118-122.
7李鑫钢,郑艳梅.炼油分离过程大型化关键技术系统集成与节能[J].天津科技,2007,34(3):6-7.
8王毅,孙安琴,蔡旺锋.芳烃精制工艺模拟与节能优化[J].计算机与应用化学,2017,34(7):513-516.
9岳金彩,闫飞,邹亮,等.精馏过程节能技术[J].节能技术,2008,26(1):64-67.