低能耗半贫液多级再生低温甲醇洗建模与优化  

Simulation and optimization of low-energy-consumption Rectisol with multistage semi-lean solvent regeneration

作　　者：李春澎 张述伟[1] 李燕 管凤宝[1] LI Chun-peng;ZHANG Shu-wei;LI Yan;GUAN Feng-bao(School of Chemical Engineering,Dalian University of Technology,Dalian 116024,China;State Key Laboratory of Fine Chemicals,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学化工学院,辽宁大连116024 [2]大连理工大学精细化工国家重点实验室,辽宁大连116024

出　　处：《天然气化工—C1化学与化工》2020年第4期82-86,93,共6页Natural Gas Chemical Industry

基　　金：国家自然科学基金重点项目(81530100)。

摘　　要：低温甲醇洗是煤化工和煤制氢过程中脱除H2S和CO2等酸性气体的有效方法,然而溶剂再生过程可观的能量消耗限制了该技术的经济效益。在常规工艺基础上提出两种半贫液多级再生工艺,通过修正的PSRK物性方程对改进的工艺进行建模与优化。结果表明:相同原料变换气处理量时,可降低深冷和电能负荷最高达10.09%,贫甲醇循环量可减少达10.73%,较大程度解决了单位贫甲醇吸收效率较低、装置深冷负荷较高的问题。提出的工艺改进方案具有投资低、适用范围广等优点,可显著提升低温甲醇洗工艺的溶剂利用效率从而降低系统能耗,具有广泛的应用前景。Rectisol process is an effective method for removing acid gases such as H2 S and CO2 in the coal chemical industry and coal-to-hydrogen production process,whose economic benifits are limited by high energy consumption of the solvent regeneration process.Two different low-energy-consumption Rectisol processes with multistage semi-lean solvent regeneration were proposed based on convetional processes.The improved processes were modeled and optimized by the modified PSRK equation.The results showed that the cryogenic and electricity load was reduced by up to 10.09%and the circulation volume of lean-methanol was reduced by 10.73%with the same shift gas treatment capacity,which solved the problems of low absorption efficiency of lean methanol and high cryogenic load.The improved scheme has the advantages of low investment and wide application range,and can significantly improve the solvent utilization efficiency of Rectisol process,thereby reducing the system energy consumption,so it will have a broad application prospect.

关 键 词：低温甲醇洗 过程模拟 甲醇再生 节能 优化设计 

分 类 号：TQ546.5[化学工程—煤化学工程] TQ113.26