真空变压吸附沼气净化过程的仿真研究

doi:10.3969/j.issn.0438-1157.2013.04.025

化工学报 ›› 2013, Vol. 64 ›› Issue (4): 1300-1305.DOI: 10.3969/j.issn.0438-1157.2013.04.025

真空变压吸附沼气净化过程的仿真研究

张湜¹, 陈文亮¹, 李晖², 张亚兵², 韦萍²

1. 南京工业大学自动化与电气工程学院,江苏南京 210009;
2. 南京工业大学生物与制药工程学院,江苏南京 210009

收稿日期:2012-07-19 修回日期:2012-11-01 出版日期:2013-04-05 发布日期:2013-04-05
通讯作者: 李晖
作者简介:张湜(1952—),女,教授。
基金资助:
国家科技支撑计划项目(2011BAD15B02);国家高技术研究发展计划项目(2012AA021405);省科技支撑计划项目(BE2010359)。

Numerical simulation of vacuum pressure swing adsorption for biogas upgrading

ZHANG Shi¹, CHEN Wenliang¹, LI Hui², ZHANG Yabing², WEI Ping²

1. School of Automation & Electrical Engineering, Nanjing University of Technology, Nanjing 210009, Jiangsu, China;
2. School of Biotechnology & Pharmaceutical Engineering, Nanjing University of Technology, Nanjing 210009, Jiangsu, China

Received:2012-07-19 Revised:2012-11-01 Online:2013-04-05 Published:2013-04-05
Supported by:
supported by the National Key Technology R&D Program(2011BAD15B02) and the High-tech Research and Development Program of China(2012AA021405).

摘要/Abstract

摘要： 真空变压吸附(VPSA)是一种气体分离技术,该技术运用在沼气净化过程还存在较多的问题,针对该过程吸附塔出口浓度出现的浓度峰问题,运用线性推动力模型(LDF)与Langmuir等温方程对其建立了数学模型,模拟分析了缓冲罐中杂质浓度对吸附步骤出口浓度的影响。结果表明:相同吸附时间下,随着吸附压的降低,二均降结束时会有更多的杂质进入缓冲罐,而缓冲罐中的杂质又会通过一均升步骤进入吸附塔,最终使得吸附步骤出口浓度曲线出现波峰,从而影响了吸附塔出口CH₄含量。通过模型的分析,吸附时间随着吸附压不断降低而缩短,可以有效控制杂质进入缓冲罐,从而使吸附塔出口CH₄含量提高。

关键词: 线性推动力模型, 真空变压吸附, 沼气

Abstract: Vacuum pressure swing adsorption(VPSA) is a technology for gas separation.There are some problems when it is applied to the process of biogas purification, among which is the concentration peak at the outlet of the column.To solve this problem, we use the linear driving force(LDF) model and Langmuir isothermal equilibrium to build a model and analyze the effect of CO₂ concentration in buffer tank on the purity of outlet of adsorption step.The results indicate that CO₂ enters the buffer tank in the second pressure equalization-depressurization and then the column in the first pressure equalization-pressurization, finally the concentration peak appears at the outlet of the column, and affects the CH₄ concentration.The simulation shows that in order to control the CO₂ concentration in buffer tank and improve the purity of the product, the adsorption time should be shorten as the adsorption pressure decreases.

Key words: linear driving force, vacuum pressure swing adsorption, biogas

中图分类号:

TQ028

张湜, 陈文亮, 李晖, 张亚兵, 韦萍. 真空变压吸附沼气净化过程的仿真研究[J]. 化工学报, 2013, 64(4): 1300-1305.

ZHANG Shi, CHEN Wenliang, LI Hui, ZHANG Yabing, WEI Ping. Numerical simulation of vacuum pressure swing adsorption for biogas upgrading[J]. CIESC Journal, 2013, 64(4): 1300-1305.

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真空变压吸附沼气净化过程的仿真研究

Numerical simulation of vacuum pressure swing adsorption for biogas upgrading

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