燃料化学学报2015，Vol.43Issue(12)：1420-1426,7.
O2/CO2气氛下CO2和H2O气化反应对煤及煤焦燃烧特性的影响
Effect of CO2 and H2O gasification on the combustion characteristics of coal and char under O2/CO2 atmosphere
摘要
Abstract
The burning behaviors of Datong coal and char under O2/N2 , O2/CO2 and O2/H2 O/CO2 atmosphere were comparatively investigated by thermogravimetric analyzer. The influence of CO2 and H2 O gasification on the oxy-fuel combustion characteristics of coal and char were mainly studied. The results indicate that at 5%oxygen concentration the burning rate of pulverized coal in each atmosphere decreases in the order of O2/N2 , O2/CO2 and O2/H2 O/CO2 . When the oxygen concentration reduces to 2%, owing to the CO2 and H2 O gasification, the overall reaction rate of pulverized coal increases in the same order at high temperatures. The burning rate of char is slower in O2/CO2 than that in O2/N2 at 5% oxygen concentration, but as the burning process is delayed, the overall reaction rate of char in O2/H2 O/CO2 rises significantly due to the action of gasification. At 2% oxygen concentration, the overall reaction rate of char in O2/CO2 is higher than the burning rate of char in O2/N2 with the rise in temperature. The overall reaction rate of char in O2/H2 O/CO2 further increases because the H2 O gasification plays a major role in CO2 and H2 O co-gasification. The kinetic analysis shows that at 5% oxygen concentration the apparent activation energy in the atmosphere increases in the order of O2/N2 , O2/CO2 and O2/H2 O/CO2 . However, the apparent activation energy of different atmospheres declines with the decrease of oxygen concentration.关键词
富氧燃烧/CO2气化/H2O气化/燃烧特性/表观活化能Key words
oxy-fuel combustion/CO2 gasification/H2 O gasification/combustion characteristics/apparent activation energy分类
能源与动力引用本文复制引用
雷鸣,黄星智,王春波..O2/CO2气氛下CO2和H2O气化反应对煤及煤焦燃烧特性的影响[J].燃料化学学报,2015,43(12):1420-1426,7.基金项目
The project was supported by National Natural Science Foundation of China ( 51276064 ) and the Fundamental Research Funds for the Central Universities (2014QN41). 国家自然科学基金(51276064)和中央高校基本科研业务费专项资金(2014QN41)项目资助 （ 51276064 ）
