{"title":"CO2 absorption with polyethyleneimine solution intensified by a rotating packed bed with liquid detention","authors":"","doi":"10.1016/j.fuel.2024.133318","DOIUrl":null,"url":null,"abstract":"<div><div>This study explored the absorption of CO<sub>2</sub> by the polyethyleneimine (PEI) solution in a rotating packed bed (RPB). In order to boost the CO<sub>2</sub> absorption effect, the liquid detention phenomenon in the RPB was utilized to overcome the short residence time of liquid. The effects of different operating parameters on CO<sub>2</sub> absorption efficiency (<em>η</em>) and gas-phase volumetric mass transfer coefficient (<em>K</em><sub>G</sub><em>a<sub>v</sub></em>) in the RPB were investigated. The experimental results indicated that the RPB can greatly intensify the absorption of CO<sub>2</sub>. <em>η</em> and <em>K</em><sub>G</sub><em>a<sub>v</sub></em> increased from 3.3 % and 0.041 kmol·m<sup>−3</sup>·h<sup>−1</sup>·kPa<sup>−1</sup> to 76.0 % and 1.634 kmol·m<sup>−3</sup>·h<sup>−1</sup>·kPa<sup>−1</sup>, respectively, as the rotational speed of the RPB rose from zero to 700 rpm with 250 mL detained liquid. It was also found that the liquid detention phenomenon can significantly elevate <em>η</em> and <em>K</em><sub>G</sub><em>a<sub>v</sub></em> as a result of extended liquid residence time and increased liquid holdup in the RPB. When the detained liquid volume increased from zero to 250 mL, <em>η</em> and <em>K</em><sub>G</sub><em>a<sub>v</sub></em> increased by 55.6 % and 113.1 %, respetively. In addition, it was observed that CO<sub>2</sub> load in the rich PEI solution increased from 9.650 to 11.189 molCO<sub>2</sub>/kg PEI while <em>η</em> remained around 85 % after five cycles of absorption–desorption, suggesting an excellent cyclic stability of PEI. This work contributes to the development of viable CO<sub>2</sub> capture technologies by intensifying the CO<sub>2</sub> absorption process in the RPB with an efficient absorbent.</div></div>","PeriodicalId":325,"journal":{"name":"Fuel","volume":null,"pages":null},"PeriodicalIF":6.7000,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Fuel","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0016236124024670","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
引用次数: 0
Abstract
This study explored the absorption of CO2 by the polyethyleneimine (PEI) solution in a rotating packed bed (RPB). In order to boost the CO2 absorption effect, the liquid detention phenomenon in the RPB was utilized to overcome the short residence time of liquid. The effects of different operating parameters on CO2 absorption efficiency (η) and gas-phase volumetric mass transfer coefficient (KGav) in the RPB were investigated. The experimental results indicated that the RPB can greatly intensify the absorption of CO2. η and KGav increased from 3.3 % and 0.041 kmol·m−3·h−1·kPa−1 to 76.0 % and 1.634 kmol·m−3·h−1·kPa−1, respectively, as the rotational speed of the RPB rose from zero to 700 rpm with 250 mL detained liquid. It was also found that the liquid detention phenomenon can significantly elevate η and KGav as a result of extended liquid residence time and increased liquid holdup in the RPB. When the detained liquid volume increased from zero to 250 mL, η and KGav increased by 55.6 % and 113.1 %, respetively. In addition, it was observed that CO2 load in the rich PEI solution increased from 9.650 to 11.189 molCO2/kg PEI while η remained around 85 % after five cycles of absorption–desorption, suggesting an excellent cyclic stability of PEI. This work contributes to the development of viable CO2 capture technologies by intensifying the CO2 absorption process in the RPB with an efficient absorbent.
期刊介绍:
The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.