摘要
工业排放烟气中SO_2是空气污染物之一,它是形成酸雨与PM2.5主要原因.本文对聚醚砜(PES)中空纤维膜接触器的脱硫性能进行了研究.以NaOH溶液为吸收剂,考察了烟气浓度、气液压差、组件长度以及组件级数、组件填充密度等因素对PES中空纤维膜脱硫性能的影响;连续实验考察了膜的耐久性和稳定性,同时研究膜润湿对传质性能的影响.结果表明,提高组件级数、组件长度以及吸收液流量均可以提高中空纤维膜的脱硫率;PES膜吸收通量随SO_2进气浓度与吸收液流量增加而变大.在连续实验中,由于膜润湿使得运行390min后吸收通量降低42%,390min后吸收通量能够维持在2.8×10^(-4) mol/(m2·s).依据膜润湿对总传质阻力影响的模型,膜相传质阻力为吸收过程中主要的传质阻力,膜相传质阻力占总传质阻力的73%.
As one of the air pollutants, SOz is the main cause of acid rain and PM2. 5. In this paper, PES hollow fiber membrane contactor was studied for the SO2 removal and absorption. The effects of SO2 concentration, pressure differential, length of the membrane fiber, packing density and other factors on SO2 absorption performance were investigated using NaOH solution. And mass transfer performance of membrane contactor was also studied. The durable and stability of membrane contactor has been proved by long-term experiment. The effect of membrane wetting on membrane mass transfer was also been discussed. The results showed that when the stages of membrane contact, the length of membrane fiber, and absorption liquid flowrate increased, SO2 removal efficiency would increase. And SO2 absorption flux increased as SO2 inlet concentration and liquid flow rate increased. The results of a long-term experiment indicated that SO2 absorption flux dropped by 42% during the initial 390 min because of membrane wetting. Then the absorption flux maintained at 2.8 × 10.4 mol/（m^2 · s） and unchanged after 390 min. Based on the model of membrane wetting effect on total mass transfer resistance, membrane mass transfer resistance would be the main mass transfer resistance in the process of absorption, which accounted for 73% of the overall mass transfer resistance.
出处
《膜科学与技术》
CAS
CSCD
北大核心
2016年第5期60-67,共8页
Membrane Science and Technology
基金
国家自然科学基金资助项目(51503146)
2013海洋公益专项项目(201305004-5)
省部共建分离膜与膜过程国家重点实验室开放课题
关键词
聚醚砜
膜接触器
膜润湿
脱硫
PES
membrane contactor
membrane wetting
desulfurization
