摘要
引言近年来CaO作为CO2吸收剂在近零排放煤直接制氢、生物质气化、吸收增强型天然气重整制氢、焦炉煤气重整制氢、燃煤电站CO2捕集等过程的应用受到国内外的持续关注和大量研究。在这些过程中CO2以CaCO3的形式固化下来,为循环利用CaO吸收剂并收集CO2,需要将产物CaCO3煅烧分解,这一过程称为CaO再生过程。CaO再生是强吸热过程,
Coke gasification,CaSO4 chemical-looping combustion and CaCO3 decomposition were integrated into a CaO regeneration reactor in the simulation performed with Aspen Plus.The effects of temperature（700—1200℃）,pressure（0.1—4 MPa）on the required minimum H2O flow,coke flow,equilibrium product yields,pollution gas emissions,heat transfer between reactors and solids circulation rate were investigated.The minimum H2O flow and coke flow reduced with increasing temperature and the declining pressure.The percentages of H2S in product gases without H2O decreased with increasing temperature and declining pressure,while the percentage of SO2 had a reverse trend.The percentage of H2S＋SO2 decreased first then increased with increasing temperature.H2S was the main gas pollutant at a lower temperature and was replaced by SO2 as temperature increased,which was explained by the side reactions of CaSO4.The heat and recycled solids between the reactors decreased while solids circulation rate increased with increasing temperature,but the heat and recycled solids between the reactors increased while solids circulation rate decreased with increasing pressure.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2012年第12期4055-4061,共7页
CIESC Journal
基金
国家高技术研究发展计划项目(2008AA05A302)
国际科技合作项目(2010DFB70560)~~
关键词
CaSO4载氧体
化学链燃烧
CaO再生
CaSO4 oxygen carrier
chemical-looping combustion
CaO regeneration
