SIMULATION ANALYSIS OF EFFECT OF CO2(L)-SLURRIES ON LOW RANK COAL IGCC PERFORMANCE
Using water-based low rank coal (LRC) slurries in IGCC systems hurts the thermodynamics of the gasification process. This results in low thermal efficiencies for gasification of LRC. Compared with water/coal slurries, liquid CO2 (CO2(l))/coal slurries are more attractive as a result of their lower heat of vaporization and viscosity. Employing CO2(l)/LRC slurries in IGCC systems offers a promising option with further improvement of the gasification performance and capability of low CO2 emissions. A model of a coal slurry IGCC plant with CO2 capture was developed in ASPEN Plus to investigate the effect of CO2(l)/LRC slurries on IGCC performance under different operating conditions. The simulation results exhibited improved coal gasification when CO2(l) was employed as a feed in place of water. Higher carbon conversions and increased net plant efficiency were achieved at lower oxygen/coal ratios. A significant change in syngas composition and lower H2O/CO ratio were observed when CO2(l) replaced water as the slurry agent. The CO2 generation from the IGCC process was effectively reduced when using CO2(l)/coal slurry. A decrease of about 1.6％ and 2.7％ in the CO2 output for Spring Creek and Cordero-Rojo coals respectively were observed at a 2.0 H2O/CO ratio in raw gas. Lower coal consumption was observed as well when using a CO2(l)/coal slurry in a IGCC process, which are estimated at about 1.13×109MJ/yr and 1.26×109MJ/yr according to current coal usage for electric generation in the US(is this estimate the reduction in coal use for the simulated plant for each type of coal or for total us lrc use?-it should be more clearly stated).
IGCC slurry low rank coal liquid CO2
Zhixiao ZHANG Marco J. CASTALDI John DOOHER
School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou, China Department of Earth and Environmental Engineering HKSM, Columbia University in the City of New Yor Dooher Institute of Physics and Energy, Adelphi University, Garden City, New York, USA
国际会议
北京
英文
385-393
2010-05-17（万方平台首次上网日期，不代表论文的发表时间）