宁东低阶烟煤水蒸气催化气化反应性研究

Investigation on Gasification Reactivity of Ningdong Para-bituminous Coal With Steam

利用快速升温热重分析装置研究了宁东煤的水蒸气气化反应行为,考察了反应温度、水蒸气浓度、碳酸钾添加量及钾-铁复合催化剂对宁东煤反应性的影响规律。结果表明,宁东煤的催化气化反应活性随温度升高显著增大。气化温度750℃和800℃时,宁东煤反应性指数分别增大为700℃时的1.82倍和5.10倍。水蒸气浓度从20%增加到60%时,相应的反应性指数增大约2.56倍,证明宁东煤和水蒸气反应基本呈一级反应;但当水蒸气浓度增大至60%以上时,反应速率的增加不明显。催化剂碳酸钾添加量增加能显著提高气化反应速率,但钾-铁复合催化剂并没有明显的协同效应。

Effect of temperatures, steam concentration, K2CO3 addition, K-Fe combined catalyst on the H2 O gasification of Ningdong para-bituminous coal（ND coal） was investigated with a thermogravimetric analyzer. The results indicate that the reactivity indexes of ND coal gasification at 750 and 800 ℃ are 1.82 and 5.10 times higher than that at 700 ℃. The gasification rate can be notably promoted by increasing steam concentration. The reactivity index of ND coal gasification with 60% steam is 2.56 times higher than that with 20% steam. It can be suggested that the steam gasification reaction may be the first order reaction. The gasification rate can be significantly improved by the K2CO3 addition. However, the synergistic effect of the K-Fe combined catalyst is not remarkable.