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.
出处
《南京工业大学学报(自然科学版)》
CAS
北大核心
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)