变压吸附空气分离过程分析  

Exergy Analysis of Air Separation with Pressure Swing Adsorption

作　　者：肖露[1,2] XIAO Lu(State Key Laboratory of the Gas Disaster Detecting,Preventing and Emergency Controlling,Chongqing 400037,China;CCTEG Chongqing Research Institute,Chongqing 400037,China)

机构地区：[1]瓦斯灾害监控与应急技术国家重点实验室,重庆400037 [2]中煤科工集团重庆研究院有限公司瓦斯研究分院,重庆400037

出　　处：《矿业安全与环保》2018年第5期99-104,共6页Mining Safety & Environmental Protection

基　　金："十三五"国家科技重大专项(2016ZX05045-006-003);中煤科工集团重庆研究院有限公司自立重点项目(2018ZDXM06)

摘　　要：以变压吸附装置节能为出发点,利用工程热力学与吸附热力学有关理论建立严格数学模型,对小型双塔变压吸附空气分离系统进行分析,得出吸附压力和反吹压力对变压吸附装置效率的影响规律,以及变压吸附空分系统各工序的损失分布。通过计算发现,适当提高反吹压力或减小吸附压力都可以提高效率;损失主要发生在空气压缩机后冷却器冷却、吸附柱吸附、废气阀泄压放空3个工序,占总输入能量的比例分别为20.32%、33.57%、19.10%,相对而言,吸附柱泄压、均压、反吹,以及均压阀减压的损失较小。借鉴研究成果,从提高效率角度出发,在保证变压吸附装置的产品纯度、回收率、分子筛吸附量的前提下,应适当减小吸附压力、增加反吹压力,有利于设计出更节能的变压吸附装置。Based on energy saving of pressure swing adsorption(PSA)device,a strict mathematical model was established by using the theory of engineering thermodynamics and adsorption thermodynamics.Through exergy analysis of air separation system with a small twin towers and PSA,It was concluded the influence law of adsorption pressure and back pressure on the exergy efficiency of PSA device.Through calculation,it is found that increasing back pressure or reduce adsorption pressure properly can improve the exergy efficiency;exergy loss occurs mainly in three processes,namely cooling process after the compressor,adsorption process inside the column,and exhaust gas valve losses in the blowdown step,the proportion of total energy input is 20.32%,33.57%and 19.10%respectively.In contrast,exergy losses less in the process of pressure release inside the column,pressure equalization,blowback and decompression in the valve used in pressure equalization.Referring to the research achievements,from the point of improving exergy efficiency,in the premise of ensuring product purity,recovery rate and adsorption capacity of molecular sieve,designers should reduce the adsorption pressure and increase the blowback pressure,so as to design more energy-saving PSA device.

关 键 词：变压吸附 空气分离 [火用]分析 [火用]效率 节能 

分 类 号：TD712[矿业工程—矿井通风与安全] TE645[石油与天然气工程—油气加工工程]