Absorption properties of hollow fiber membranes of different materials for flue gas desulfurization

doi:10.16085/j.issn.1000-6613.2019-1607

Abstract

Abstract:

Flue gas desulfurization with membrane has low energy consumption, large mass transfer area and high separation efficiency, which can effectively solve the problems of liquid flooding, liquid leakage and entrainment in traditional towers. The absorption performances of FTEE, PVDF and PP hollow fiber membranes applied in sulfur dioxide absorption were compared by a self-made membrane contactor. The effects of flue gas flow rate, water flow rate and water temperature in different membrane were investigated. The membrane parameters and hydrophobicity of these three membranes were detected and compared by scanning electron microscope and contact angle measuring instrument. The absorption performances of three membranes were in ascending order of PTFE＞PP＞PVDF under all the different conditions. In terms of the absorption concentration of sulfur dioxide in 120min, the maximum ratio of PTFE to PP was 1.68∶1, and the maximum ratio of PTFE to PVDF was 4.62∶1. The change of gas flow had a significant effect on the absorption of sulfur dioxide. When the flue gas flow rate increased from 60mL/min to 140mL/min, the absorption capacity of PTFE was obviously enhanced, and in 120min, the absorption concentration of sulfur dioxide increased by 2.14 times. The hydrophobicity was the main parameter that affected membrane performance. The surface contact angles of PTFE before and after immersion were 105° and 97°, respectively, and the hydrophobicity was much stronger than PP and PVDF. Among all, PTFE hollow fiber membrane had large pore size, high porosity, high hydrophobicity. Especially its good temperature resistance could highly reduce the cooling procedure of flue gas. These advantages made it a good application prospect in flue gas desulfurization process.

Key words: membranes, adsorption, sulfur dioxide, flue gas

摘要：

膜法烟气脱硫能耗低、传质面积大、分离效率高，可以有效地解决传统塔器内的液泛、漏液、夹带等问题。本文采用自制的中空纤维膜接触器，通过改变烟气流量、水流量和水温对比了聚四氟乙烯（PTFE）、聚偏氟乙烯（PVDF）和聚丙烯（PP）这3种中空纤维膜对烟气中二氧化硫的吸收性能，并通过电镜和接触角仪表征，对比了3种膜的参数和疏水性。结果表明：在不同烟气流量、水量和水温下，3种膜的吸收性能都表现为PTFE＞PP＞PVDF，120min时二氧化硫吸收浓度，PTFE最大，是PP的1.68倍，是PVDF的4.62倍；烟气流量的改变对二氧化硫的吸收浓度有显著影响，当烟气流量由60mL/min提高到140mL/min时，120min时PTFE膜二氧化硫的吸收浓度提高了2.14倍；影响膜性能的主要因素为疏水性，PTFE浸泡前后的表面接触角为105°和97°，疏水性远大于PP和PVDF。PTFE中空纤维膜孔径大、孔隙率高，具有极强的疏水性，在烟气脱硫及相关吸收过程中表现出较好的应用前景。

关键词: 膜, 吸收, 二氧化硫, 烟气

CLC Number:

TQ111.16

Chaopeng YANG, Jie LIU, Hongda SHI, Zhiyong JI, Yingying ZHAO, Junsheng YUAN. Absorption properties of hollow fiber membranes of different materials for flue gas desulfurization[J]. Chemical Industry and Engineering Progress, 2020, 39(8): 3205-3212.

杨超鹏, 刘杰, 史宏达, 纪志永, 赵颖颖, 袁俊生. 不同中空纤维膜材料对烟气中二氧化硫的吸收性能影响[J]. 化工进展, 2020, 39(8): 3205-3212.

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