燃料化学学报2012，Vol.40Issue(2)：138-142,5.
碱金属碳酸盐对褐煤程序升温热解过程中H2S和NH3生成的影响
Effect of alkali carbonates on the formation of H2S and NH3 during temperature programmed pyrolysis of brown coal
摘要
Abstract
Using a brown coal from Ximeng mine in Inner Mongolia as raw sample, 3% the carbonates of lithium, sodium or potassium were evenly mixed with raw coal and demineralized coal (the inherent mineral was removed by acid-washing). The effects of the minerals and the alkali carbonates added in raw coal on the formation of H2S and NH3 during temperature programmed pyrolysis was studied by a fixed-bed reactor and gas chromatography. The results show that the inherent mineral in Ximeng brown coal can restrain the formation and release of H2S and NH3 during pyrolysis. The temperature range of maximum H2S release from demineralized coal is same to that of raw coal because the organic structure of coal and the form of sulfur are not changed. But the behavior of NH3 is obviously changed in the different temperature range because the secondary reaction of HCN is also one of main sources for NH3 formation, which is affected by the pore structure change of coal demineralized by acid-washing. The alkali carbonates added have different effects on the formation of NH3 and H2S during pyrolysis. Except for K2CO3, the presence of alkali carbonates can prohibit the formation of H2S. They can promote the formation of NH3, except for Na2CO3 added in demineralized coal.关键词
煤/热解/碱金属碳酸盐/H2S/NH3Key words
coal/ pyrolysis/ alkali carbonates/ H2S/ NH3分类
资源环境引用本文复制引用
孟丽莉,付春慧,王美君,常丽萍..碱金属碳酸盐对褐煤程序升温热解过程中H2S和NH3生成的影响[J].燃料化学学报,2012,40(2):138-142,5.基金项目
国家自然科学基金(21176165) （21176165）
高等学校博士学科点专项科研基金博导类资助课题(20111402110009) （20111402110009）
山西省留学人员基金(200730). （200730）
