膜曝气-吸收耦合式海水烟气脱硫过程

doi:10.16085/j.issn.1000-6613.2018-2261

摘要/Abstract

摘要：

利用聚丙烯中空纤维双层曝气式膜接触器，对膜曝气-膜吸收耦合式海水烟气脱硫过程开展实验研究，考察了烟气流量、海水流量、海水pH以及曝气量等因素对烟气脱硫参数的影响。结果表明，曝气式膜吸收过程具有更高的脱硫效率和传质性能，相较于非曝气过程，SO₂吸收率可提高12.4%。提高烟气流量，使SO₂吸收率降低，总传质系数先增大再减小；提高吸收剂流量、pH和曝气量，SO₂吸收率和总传质系数均会提高，海水pH较高条件下加入曝气更能有效加强吸收效果；烟气中SO₂的吸收通量均随海水pH和曝气量的增加而增加。扫描电镜及接触角测量显示在使用一个月后的膜丝仍具有较高的疏水性能和使用性能。

关键词: 吸收, 膜曝气, 膜接触器, 烟气脱硫, 中空纤维膜, 海水

Abstract:

A membrane aeration-absorption combined flue gas desulfurization process was investigated using polypropylene hollow fiber dual-layer membrane contactor. The influences of flue gas flow rate, seawater flow rate, seawater pH and aeration flow rate on SO₂ absorption were investigated. The results show that higher desulfurization efficiency and mass transfer performance are achieved in the novel membrane aeration-absorption process, in which SO₂ absorption rate increases by 12.4% comparing to normal one. The flue gas flow rate increases induce to SO₂ absorption rate decreases, while total mass transfer coefficient increases first and then decreases. Increasing of seawater flow rate, seawater pH and aeration rate result in SO₂ absorption rate and total mass transfer coefficient increase. Aeration with higher seawater pH presents better absorption effect. Higher seawater pH and bigger aeration rate lead to larger absorbed flux. The characterization of SEM and contact angle show that the hollow fiber membrane still has high hydrophobic properties and usability after one month, which shows a good application prospects of polypropylene (PP) hollow fiber membranes.

Key words: absorption, membranes aeration, membrane contactor, desulphurization, polypropylene hollow fiber membrane, seawater

中图分类号:

TQ028.8

邓梦轩,刘杰,杨超鹏,袁俊生. 膜曝气-吸收耦合式海水烟气脱硫过程[J]. 化工进展, 2019, 38(08): 3902-3909.

Mengxuan DENG,Jie LIU,Chaopeng YANG,Junsheng YUAN. Seawater flue gas desulfurization by membrane aeration- membrane absorbent combined process[J]. Chemical Industry and Engineering Progress, 2019, 38(08): 3902-3909.

图/表 14

表1 中空纤维膜接触器参数

参数名称	参数
孔径/μm	0.22
孔隙率/%	65
膜丝直径（内径/外径）/mm	0.6/1.0
膜丝有效长度/mm	100
膜丝根数（吸收/曝气）/根	30/30
膜接触器尺寸（长×宽×高）/mm	220×95×40
膜组件尺寸（长×宽×高）/mm	180×60×40
膜面积（吸收/曝气）/m²	0.007535/0.007535

图1 膜元件照片

图2 膜吸收海水烟气脱硫流程图

图3 烟气流量对SO2吸收率及SO2出口浓度的影响

图4 烟气流量对吸收过程总传质系数的影响

图5 海水流量对SO2吸收率的影响

图6 海水流量对吸收过程总传质系数的影响

图7 海水pH对SO2吸收率及气相出口处SO2浓度的影响

图8 海水pH对吸收过程总传质系数和SO2吸收通量的影响

图9 鼓气量对SO2吸收率及气相出口处SO2浓度的影响

图10 鼓气量对SO2吸收通量及总传质系数的影响

图11 中空纤维膜丝使用一个月后SEM图像

图12 膜丝外表面固体A11、A12能谱图

图13 接触角测定

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