钾对秸秆混煤燃烧特性影响的研究

摘要

Coal and straw were deashed by acid to make experimental samples for the combustion experiments. The effects of alkali metal potassium on the co-combustion characteristic of straw and coal were investigated by TG/DTG/DTA. The results show that KOH promotes the deashed coal and deashed blends of straw and coal to ignite, reduces the temperature of maximum loss weight rate and burning-out, but elevates the ignition temperature of deashed straw. In addition, the co-combustion of straw and coal can be fitted with the first order reaction model. Adding KOH to samples can catalyze the co-combustion and reduce the activation energy by 10 kJ/mol.%选用经酸洗法脱灰的煤和秸秆制得实验样品.采用TG/DTG/DTA技术研究了不同秸秆含量下碱金属钾对秸秆与煤混合燃烧特性的影响.研究结果表明,KOH促进脱灰煤和脱灰混合样品的着火燃烧,使其最大燃烧速率温度及燃尽温度降低,但提高了脱灰秸秆的着火温度.秸秆混煤燃烧反应符合一级反应模型,KOH的添加对混煤燃烧具有催化作用,使混合燃烧反应活化能降低10 kJ/mol.