不同均压方式对PSA和VSA空分制氧过程的影响  

Effects of different pressure equalization methods on PSA and VSA processes for O_2 production from air

作　　者：杨彦铡[1] 丁艳宾 马正飞[1] 赵春风[3] 

机构地区：[1]南京工业大学化学化工学院,材料化学工程国家重点实验室,江苏南京210009 [2]上海穗杉实业有限公司,上海201500 [3]中国石化集团南京工程有限公司,江苏南京211112

出　　处：《南京工业大学学报（自然科学版）》2012年第4期79-83,共5页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：长江学者和创新团队发展计划资助项目(IRT0732);江苏省高校自然科学重大基础研究资助项目(08KJA530001)

摘　　要：对存在于变压吸附(PSA)和真空变压吸附(VSA)空分制氧过程中的均压步骤进行研究,应用ASPENADSIM软件,模拟并比较4种不同均压方式(塔顶向塔顶均压(T-T),塔底向塔底均压(B-B),塔顶和塔底双向均压(TB),塔顶向塔底均压(T-B))对过程的影响,分析均压步骤的物流浓度、流量以及均压结束时床层轴向浓度分布。结果表明:采用T-B均压方式的PSA和VSA过程得到的产品O_2纯度和收率最高。在均压步骤,均降床层塔顶出气有利于死空间中O_2的回收,且减少床层吸附相中N_2的脱附带出,从而得到较高的产品O_2收率;均升床层塔底进气可使床层N_2的质量摩尔浓度前沿陡峭,塔顶洁净,因此得到较高的产品O_2纯度。The pressure equalization step in O2 production from air of pressure swing adsorption （I-＇5A） and vacuum swing adsorption （VSA） processes was studied. Influences of four different pressure equaliza- tion modes （the two beds connected by top to top （T-T）, bottom to bottom （B-B）, top and bottom both sides（TB） ,top to bottom（T-B） ） on 02 production from air were simulated by ASPEN-ADSIM. Accord- ingly, the O2 concentration and flowrate of the stream in the pressure equalization step and the bed con- centration profiles at the end of pressure equalization step were investigated. Results showed that PSA and VSA processes adopting, the pressure equalization mode of T-B had the highest O2 purity and O2 recovery. During pressure equalization step, opening the outlet end of bed 1 （ experiencing the step of de- pressurizing pressure equalization） to discharge gas benefit the increasing of O2 recovery of product, but opening the inlet end of bed 2 （ experiencing the step of pressurizing pressure equalization） to let gas in from bed 1 had the benefit to increasing O2 purity of product.

关 键 词：PSA VSA 制氧 模拟 均压方式 ASPEN—ADSIM 

分 类 号：TQ028.15[化学工程]