甲苯吸收分离乙烯工艺的火用分析

Exergy analysis of toluene absorption process in ethylene separation

针对甲烷氧化偶联法制烯烃产物气体的分离,提出一种以甲苯为吸收剂吸收乙烯的吸收分离工艺。采用As-pen Plus流程模拟软件分别对甲苯吸收乙烯分离工艺和AgNO3络合吸收乙烯分离工艺进行了模拟,提出了两个工艺的能量利用情况数据。研究结果表明,甲苯吸收分离工艺的电耗比AgNO3络合吸收分离工艺节省电耗95.23%,同时系统可自产蒸汽和冷量满足内部需求。采用能流结构图直观地分析了甲苯吸收乙烯分离工艺,揭示了系统火用损失发生的主要部位和原因,说明了系统的节能效果。

Aiming at the separation process of olefin production by oxidative coupling of methane,a new absorption technique for ethylene separation is proposed.The toluene is used as absorbent.The Aspen Plus simulation software is employed to separation process of toluene absorption and AgNO3 complexation absorption.The data of energy utilization of two processes are obtained.Simulation result shows that the clectricity consumption of toluene absorption is reduced by 95.23% than that of AgNO3 complexation absorption.The steam and chilled medium of liquid ammonia can be produced to meet the demand of process.The main locations and reasons of exergy loss are illustrated by energy-flow framework diagram.The effects of energy conservation is discussed.