Study on Reclamation Process of CO2 Absorbent Based on Electrodialysis Technology

doi:10.12096/j.2096-4528.pgt.22019

Abstract

Abstract:

Aiming at the problem of amine loss in the process of removing heat stable salt (HSS) by electrodialysis (ED), by comparing the three typical membrane stack configurations of ED equipment, such as two-chamber ED, three-chamber ED and bipolar membrane ED, this paper studied the regeneration process of reclaimed amine solution under the fixed experimental condition. The removal rate of HSS, the ability of amine regeneration, energy consumption, current efficiency and other important performance indicators were investigated. The results show that different membrane stack configurations have great differences in the operation process, and the performance of three-compartment ED is the best. The amine loss rate is reduced to 42.7% of that of conventional electrodialysis under the premise of ensuring other performance. The results of the study can not only deepen the understanding of ED technology for the reclamation of organic amine, but also lay a theoretical foundation for the use and promotion of absorbent reclamation technology.

Key words: CO₂ capture, heat stable salt (HSS), electrodialysis, absorbent, reclamation, organic amine

CLC Number:

TK 01

Xiaoduan LI, Xinglei ZHAO, Yi YE, Baodeng WANG, Rihua XIONG. Study on Reclamation Process of CO₂ Absorbent Based on Electrodialysis Technology[J]. Power Generation Technology, 2022, 43(4): 593-599.

Figures/Tables 9

Tab. 1 Absorbent water quality with HSS

项目	质量浓度/(mg∙L^-1)
MEA	305 000
甲酸	8 000
乙酸	4 000
草酸	1 500
硝酸	5 000
硫酸	4 800
盐酸	4 300

Fig. 1 Schematic diagram of HSS removal with three membrane stack configurations

Fig. 2 Curve of HSS anion removal with time

Fig. 3 Curve of voltage with time

Fig. 4 MEA loss rate comparison

Fig. 5 MEA content trend during the removal of HSS by electrodialysis

Fig. 6 pH curve of absorbent with time

Fig. 7 MEA reclamation capacity comparison

Fig. 8 Comparison of power consumption and current efficiency

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Study on Reclamation Process of CO₂ Absorbent Based on Electrodialysis Technology

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