摘要
提出一种基于钙循环法适用于燃煤电站的燃气/蒸汽联合循环捕集CO2新型系统,把该CO2捕集系统分成4个子系统:煤气化子系统、燃气子系统、钙循环捕集CO2子系统、余热锅炉及汽水循环子系统。采用Aspen Plus软件平台对各子系统进行热力学建模和模拟。结果表明,在CO2捕集效率为90%时,在一定钙基吸收剂流量参数下该CO2捕集系统的净效率可达41.81%。氧碳物质的量比和汽碳物质的量比对气化炉煤气中的CO、H2和CH4体积分数有重要影响。随着氧碳比和汽碳比的增加,煤气热值和CO2捕集系统净效率均呈现下降趋势。为了保持较高的系统净效率,氧碳比应小于0.24。
A new cyclic CO2 capture system based on calcium looping cycle using gas/steam combined cycle for coal-fired plant was proposed.The CO2 capture system was divided into four subsystems：coal gasification subsystem,gas subsystem,calcium cyclic capturing CO2 subsystem and HRSG and steam-water circulation subsystem.The thermodynamic modeling and simulation for the subsystems were performed by Aspen Plus software platform.The results show that the net efficiency of the CO2 capture system reaches 41.81% at the CO2 capture efficiency of 90% with the certain flow parameter of calcium-based sorbent.The oxygen/carbon molar ratio and steam/carbon molar ratio exhibit a significant effect on the volume fraction of CO,H2 and CH4 in the gas from the gasifier.The heat value of the gas and net efficiency of the CO2 capture system show a decrease with increasing the oxygen/carbon and team/carbon molar ratios.The molar ratio of oxygen/carbon should be less than 0.24 in order to keep the high system net efficiency.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2011年第1期118-123,共6页
Journal of China Coal Society
基金
中国博士后科学基金资助项目(20090461205)
山东省博士后创新项目专项资金(200902019)
山东大学自主创新基金资助项目
关键词
钙循环
燃气/蒸汽联合循环
CO2捕集
系统模拟
calcium looping cycle
gas/steam combined cycle
CO2 capture
system simulation
