化工进展2026，Vol.45Issue(8)：4574-4587,14.DOI:10.16085/j.issn.1000-6613.2025-1484
K2CO3/Al2O3固体吸附剂脱碳试验与数值模拟的比对分析
Comparative analysis of experiment and simulation for decarburization process by K2CO3/Al2O3 solid adsorbents
摘要
Abstract
To promote the engineering application of the CO2 capture technology by K2CO3/Al2O3 solid adsorbents,the comparative study of experiment and simulation for the adsorption-regeneration cyclic decarburization system by K2CO3/Al2O3 solid adsorbents was conducted.Firstly,an experimental setup for the adsorption-regeneration cyclic decarburization system by K2CO3/Al2O3 solid adsorbents was established.Cold-state gas-solid flow experiments ensured excellent solid circulation in the setup.In the hot-state CO2 capture experiments,for a flue gas treatment capacity of 4.0m3/h,under operating conditions of a solid circulation rate of 30kg/h,adsorber bed height of 350mm,adsorption temperature of 333K,and regeneration temperature of 573K,the setup achieved approximately 80％CO2 capture efficiency over 20-hour continuous operation.Besides,the adsorbent maintained excellent decarburization capability despite the presence of wear.Secondly,to explore the multiphase reactive mechanism within the experimental system,three-dimensional numerical simulations were performed.The results showed that the CO2 mass fraction at the gas-solid separator outlet was 2％,corresponding to a CO2 capture efficiency of 80％.The dry-based CO2 mass fraction at the regenerator outlet reached 99％,meeting industrial requirements.At the inlet of the gas-solid separator,the mass fractions of K2CO3 and KHCO3 were 17.4％and 14.5％,respectively,while at the return pipe,the mass fractions of K2CO3 and KHCO3 were 29.9％and 0.1％,respectively,with the adsorbent conversion rate of 36.5％.Finally,by combining experimental and numerical methods,effects of fluidized bed parameters on CO2 capture efficiency were further analyzed.It was found that increasing the solid circulation rate,adsorber bed height,water vapor concentration,and regeneration temperature helped improve the CO2 capture efficiency.Keeping other parameters constant,when the solid circulation rate increased(10kg/h→30kg/h),the CO2 capture efficiency increased(69.3％→81.3％).When the adsorber bed height increased(250mm→450mm),the CO2 capture efficiency increased(68.2％→85.7％).When the water vapor concentration increased(8％→14％),the CO2 capture efficiency increased(66.0％→82.1％).When the regeneration temperature increased(473K→573K),the CO2 capture efficiency increased(63.1％→81.3％).Nevertheless,enhancing the cyclic decarburization performance by varying fluidized bed parameters was also influenced by comprehensive energy consumption.关键词
二氧化碳捕集/多相反应/流化床/K2CO3/Al2O3固体吸附剂/数值模拟Key words
CO2 capture/multiphase reaction/fluidized-bed/K2CO3/Al2O3 solid adsorbent/numerical simulation分类
化学化工引用本文复制引用
吴影,王金可,闫建国,罗杰,赵环宇,段元强,陈晓平..K2CO3/Al2O3固体吸附剂脱碳试验与数值模拟的比对分析[J].化工进展,2026,45(8):4574-4587,14.基金项目
国家重点研发计划(2022YFE0206600) （2022YFE0206600）
贵州省科技支撑项目[黔科合支撑(2026)一般179] （2026）
江苏省农业科技自主创新资金[CX(24)3118] （24）
淮安市社会发展计划(绿色生态)(HAN202501) （绿色生态）
淮安市级基础研究计划(联合专项)(HABL2023011) （联合专项）
淮上英才计划驻淮高校优秀博士项目(Z302J24203). （Z302J24203）
