沼气膜分离工艺参数模拟研究  

Simulation Study on Process Parameters of Biogas Membrane Separation

作　　者：梁正贤[1] 黄福川[1] 马良涛[1] 符侃 经建芳[1] 

机构地区：[1]广西大学化学化工学院,广西石化资源加工及过程强化技术重点实验室,广西南宁530004

出　　处：《当代化工》2016年第2期323-325,共3页Contemporary Chemical Industry

摘　　要：生物天然气是近年来新兴的一种可再生清洁能源,核心技术就是去除沼气中的CO_2。利用聚酰亚胺中空纤维膜,以CO_2/CH_4混合体系作为研究对象,通过采用PRO/II模拟软件进行模拟,考察了原料气压力、渗透侧压力、膜面积和原料气组成对膜分离过程的影响。结果表明:原料气压力的增加和渗透侧压力的降低,均有利于产品气CH_4纯度的提高,然而会造成CH_4回收率降低和能耗的增加;膜面积的增加,有利于CH_4纯度的提高,但是会造成CH_4回收率降低和设备成本增加;在设计条件下,随着进气CH_4摩尔分数增大,产品气CH_4纯度略有下降,但均能得CH_4纯度大于97%的车用天然气,满足各种不同比例沼气的分离。Biogas is a new kind of renewable clean energy in recent years; the core technology is to remove the CO_2 in the biogas. In this paper, polyimide hollow fiber membrane was used as membrane module. PRO/II simulation software was used to simulate the CO_2/CH_4 hybrid system.And the influence of the raw material gas pressure, the osmotic pressure, the membrane area and the composition of raw material on the membrane separation process was investigated. The results show that the increase of feed gas pressure and the decrease of the osmotic pressure are beneficial to the improvement of the purity of product gas CH_4. H_owever, the recovery rate of CH_4 decreases and the energy consumption increases; The increase of membrane area is beneficial to the improvement of CH_4 purity, but it can result in the decrease of CH_4 recovery and the increase of the cost of equipment; Under the design conditions, the purity of product gas CH_4 decreases slightly with the increase of CH_4 mole fraction, but the purity of CH_4 is greater than 97%, which can meet the separation of different proportions of biogas.

关 键 词：沼气提纯 膜分离 PRO/II模拟 

分 类 号：TQ028[化学工程]