Influence of particles on mass transfer performance for CO2 absorption using K2CO3 solution in a random θ-ring packed column. (March 2017)

• Record Type: Journal Article
• Authors: Xie, Wenxia; Zhang, Jun; Xu, Lixin; Lv, Jianhong; Zhong, Hui; Sheng, Changdong
• Is Part Of: International journal of greenhouse gas control. Volume 58(2017)
• Page Start: 81
• Page End: 86
• Publication Date: 2017-03
• Subjects: CO2 capture -- Mass transfer performance -- Potassium carbonate -- Packed column -- Fly ash -- Influence; Greenhouse gases -- Environmental aspects -- Periodicals; Air -- Purification -- Technological innovations -- Periodicals; Gaz à effet de serre -- Périodiques; Gaz à effet de serre -- Réduction -- Périodiques; Air -- Purification -- Technological innovations; Greenhouse gases -- Environmental aspects; Periodicals; 363.73874605
• DOI: 10.1016/j.ijggc.2016.12.020
• Languages: English
• ISSNs: 1750-5836

Abstract

Graphical abstract: Highlights: The presence of the particles reduces the volumetric overall mass-transfer coefficient KG av . Chemical compositions of the particles have no effect on the KG av . The solution temperature increase or the L/G decrease slightly weakens the effect of the particles on the KG av . The effect of the particles concentration on the KG av increases gradually and becomes stable finally. The effect of the particle on the KG av is realized via changing the initial distribution of the absorption solution. Abstract: The buildup of uncaptured fly ash particles from wet flue gas desulfurization (WFGD) system in post-combustion CO2 capture processes is an important issue in existing coal-fired power plants. A self-designed lab-scale packed column filled with θ-ring packing was used to investigate the influence of fly ash particles on the volumetric overall mass-transfer coefficient KG av using K2 CO3 absorbent. The affecting laws of fly ash particles on the KG av were discussed under different operating conditions such as the solution temperature, the liquid-gas ratio L/G and the concentration of fly ash particles. The results showed that the effect of two types of fly ash particles on the outlet CO2 concentration mainly occurred at the early period of the experimental process, while the effect extent of the Inner Mongolia ash was larger than Nanjing ash. The solution temperature and the liquid-gas ratio had a significant role in promoting the KG av, but the presence of fly ash particles in K2 CO3 solution markedly reduced the KG av . The influence of fly ash particles on the KG av was independent of its chemical compositions, but was related to the operating parameters. With the solution temperature increasing, the influence of fly ash particles on the KG av was weakened but, conversely, was increased with the liquid-gas ratio increasing. Change range of the KG av was smaller and finally reached a stable state as the fly ash particles concentration increases. The analysis results indicated that the influence of the ash particles was realized via changing the initial distribution of the absorption solution.