Effect of Fly Ash on the Mass Transfer Performance of CO<sub>2</sub> Removal Using MEA and DEA Solutions in a Packed Tower
The accumulation of uncollected fly ash from flue gas in post-combustion CO<sub>2</sub> capture processes is a significant concern in current coal-fired power plants due to its potential impact on the performance of CO<sub>2</sub> absorbent and absorption towers. In order to...
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MDPI AG
2024-01-01
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| Online Access: | https://www.mdpi.com/2297-8739/11/1/20 |
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| author | Wenxia Xie Chunmin Tu Jun Zhang Chengwei Xu |
| author_facet | Wenxia Xie Chunmin Tu Jun Zhang Chengwei Xu |
| author_sort | Wenxia Xie |
| collection | DOAJ |
| description | The accumulation of uncollected fly ash from flue gas in post-combustion CO<sub>2</sub> capture processes is a significant concern in current coal-fired power plants due to its potential impact on the performance of CO<sub>2</sub> absorbent and absorption towers. In order to determine the effect of fly ash on the mass transfer performance of CO<sub>2</sub> absorption into monoethanolamine (MEA) and diethanolamine (DEA) aqueous solutions, experimental studies were carried out using a small-sized packed tower equipped with θ-ring random packing. These studies were conducted under various operating parameters, including solution temperature, liquid/gas ratio (L/G), packing height, and fly ash concentration. The results show that the effect of fly ash on the outlet CO<sub>2</sub> concentration was primarily observed during the initial stages of the experimental process. Moreover, the presence of fly ash leads to a reduction in the volumetric overall mass transfer coefficient (<i>K<sub>G</sub>a<sub>v</sub></i>) when using MEA and DEA solution, and increasing the fly ash concentration further exacerbates this negative impact. However, the effect of fly ash on the reduction in <i>K<sub>G</sub>a<sub>v</sub></i> is not significantly related to its chemical composition but rather depends on the operational parameters. With increasing solution temperature, liquid/gas ratio (L/G), and packing height, the <i>K<sub>G</sub>a<sub>v</sub></i> values for different solutions exhibit an upward trend. The negative effect of fly ash on <i>K<sub>G</sub>a<sub>v</sub></i> remains relatively stable for MEA as solution temperature and packing height increase. Compared to MEA, fly ash has a greater negative effect on DEA solution under the same experimental conditions. The analysis reveals that the detrimental effect of fly ash on <i>K<sub>G</sub>a<sub>v</sub></i> primarily stems from its ability to alter the distribution state of the absorption liquid within the packed tower. |
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| spelling | doaj.art-c222fda7b0f54c9791c819422315ecd92024-01-26T18:27:27ZengMDPI AGSeparations2297-87392024-01-011112010.3390/separations11010020Effect of Fly Ash on the Mass Transfer Performance of CO<sub>2</sub> Removal Using MEA and DEA Solutions in a Packed TowerWenxia Xie0Chunmin Tu1Jun Zhang2Chengwei Xu3School of Intelligent Manufacturing and Information Engineering, Shaanxi Energy Institute, Xianyang 712000, ChinaShaanxi Investment Group Co., Ltd., Xi’an 710061, ChinaSchool of Energy and Environment, Southeast University, Nanjing 210096, ChinaCollege of Electrical, Energy and Power Engineering, Yangzhou University, Yangzhou 225127, ChinaThe accumulation of uncollected fly ash from flue gas in post-combustion CO<sub>2</sub> capture processes is a significant concern in current coal-fired power plants due to its potential impact on the performance of CO<sub>2</sub> absorbent and absorption towers. In order to determine the effect of fly ash on the mass transfer performance of CO<sub>2</sub> absorption into monoethanolamine (MEA) and diethanolamine (DEA) aqueous solutions, experimental studies were carried out using a small-sized packed tower equipped with θ-ring random packing. These studies were conducted under various operating parameters, including solution temperature, liquid/gas ratio (L/G), packing height, and fly ash concentration. The results show that the effect of fly ash on the outlet CO<sub>2</sub> concentration was primarily observed during the initial stages of the experimental process. Moreover, the presence of fly ash leads to a reduction in the volumetric overall mass transfer coefficient (<i>K<sub>G</sub>a<sub>v</sub></i>) when using MEA and DEA solution, and increasing the fly ash concentration further exacerbates this negative impact. However, the effect of fly ash on the reduction in <i>K<sub>G</sub>a<sub>v</sub></i> is not significantly related to its chemical composition but rather depends on the operational parameters. With increasing solution temperature, liquid/gas ratio (L/G), and packing height, the <i>K<sub>G</sub>a<sub>v</sub></i> values for different solutions exhibit an upward trend. The negative effect of fly ash on <i>K<sub>G</sub>a<sub>v</sub></i> remains relatively stable for MEA as solution temperature and packing height increase. Compared to MEA, fly ash has a greater negative effect on DEA solution under the same experimental conditions. The analysis reveals that the detrimental effect of fly ash on <i>K<sub>G</sub>a<sub>v</sub></i> primarily stems from its ability to alter the distribution state of the absorption liquid within the packed tower.https://www.mdpi.com/2297-8739/11/1/20CO<sub>2</sub> removaleffectvolumetric overall mass transfer coefficient (<i>K<sub>G</sub>a<sub>v</sub></i>)fly ashMEADEA |
| spellingShingle | Wenxia Xie Chunmin Tu Jun Zhang Chengwei Xu Effect of Fly Ash on the Mass Transfer Performance of CO<sub>2</sub> Removal Using MEA and DEA Solutions in a Packed Tower Separations CO<sub>2</sub> removal effect volumetric overall mass transfer coefficient (<i>K<sub>G</sub>a<sub>v</sub></i>) fly ash MEA DEA |
| title | Effect of Fly Ash on the Mass Transfer Performance of CO<sub>2</sub> Removal Using MEA and DEA Solutions in a Packed Tower |
| title_full | Effect of Fly Ash on the Mass Transfer Performance of CO<sub>2</sub> Removal Using MEA and DEA Solutions in a Packed Tower |
| title_fullStr | Effect of Fly Ash on the Mass Transfer Performance of CO<sub>2</sub> Removal Using MEA and DEA Solutions in a Packed Tower |
| title_full_unstemmed | Effect of Fly Ash on the Mass Transfer Performance of CO<sub>2</sub> Removal Using MEA and DEA Solutions in a Packed Tower |
| title_short | Effect of Fly Ash on the Mass Transfer Performance of CO<sub>2</sub> Removal Using MEA and DEA Solutions in a Packed Tower |
| title_sort | effect of fly ash on the mass transfer performance of co sub 2 sub removal using mea and dea solutions in a packed tower |
| topic | CO<sub>2</sub> removal effect volumetric overall mass transfer coefficient (<i>K<sub>G</sub>a<sub>v</sub></i>) fly ash MEA DEA |
| url | https://www.mdpi.com/2297-8739/11/1/20 |
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