Abstract: By using the unreacted-core shrinking model，a kinetic model of gas-solid reaction in GE gasifier was developed. The mass and heat balances in the gasifier based on the “small compartment model” were established. The modeling results were compared with literature values，and the error of main gas mole fraction of gasification outlet was less than 2%，showing that modeling results were in agreement with reported values. The effects of oxygen to coal ratio and coal slurry concentration on syngas content，temperature and cold gas efficiency were analyzed. CO concentration increased and H2 concentration decreased with increasing oxygen to coal ratio，meanwhile CO2 concentration stayed constant. Cold gas efficiency increased firstly，and then declined in the range of 74%－79%. CO concentration increased，and H2，CO2 concentration decreased with increasing coal slurry concentration，but cold gas efficiency changed little. The profiles of syngas concentration and temperature distribution were studied at oxygen to coal ratio of 0.95 and coal slurry concentration of 55%. When gasifier height was less than 0.5m，the reaction between C and O2 occured rapidly，and when O2 was consumed completely，temperature decreasesd.

Key words: gaifier, kinetic, modeling, ratio of oxygen to coal

摘要： 利用未反应芯缩核模型建立了GE气化炉内气固反应的动力学模型，依据“小室模型”进行了气化炉中物质的质量和热量衡算。模型计算结果与文献值进行了对比，气化炉出口主要气体摩尔分数最大误差不超过2%，表明模型具有一定的合理性。分析了不同氧煤比、水煤浆浓度对合成气组成、温度及冷煤气效率的影响。研究结果表明：随着氧煤比增加，CO含量增加，H2含量减少，CO2含量几乎不变，冷煤气效率先增加后减少，其变化范围为74%～79%；随着水煤浆浓度增加，CO含量增加，H2和CO2含量有所降低，冷煤气效率变化不明显。研究了当氧煤比为0.95、水煤浆浓度为55%时，合成气组分浓度及温度在床层中的分布情况，结果显示：当气化炉高度小于0.5 m时，气化反应发生剧烈，当O2消耗完毕后，合成气温度下降。

关键词: 气化炉, 动力学, 建模, 氧煤比