摘要
采用超高温热重/差示扫描量热仪,研究了神木烟煤和宝日希勒褐煤在室温至1 600℃之间N_2气氛中的热解特性,以及神木烟煤在CO_2气氛中的热解气化特性.研究表明,在1 000℃-1600℃范围内,两种煤仍保持一定的热解速率,在该温度段的失重分别为4.49%和6.21%,褐煤在1 200℃-1 500℃内还存在一个明显的失重峰.在200℃-949℃/969℃之间,烟煤和褐煤热解放出热量,两种煤最大净放热量分别为728mJ/mg和1 776mJ/mg,而在其他温度段主要表现为吸热.CO_2气氛下烟煤中低温失重曲线与N_2气氛中的基本相同,800℃时失重量相近.但CO_2气氛下中低温热解过程几乎不放热,反应级数也变为3级,与N_2气氛完全不同.
The purpose of this paper was to test the pyrolysis charecteristics of Shenmu bituminous coal and Baorixile lignite at super-high temperature by means of thermogravimetric analysis and different scanning calorimeter.The pyrolysis and gasification of the bituminous coal in CO_2 atmosphere was also included in this paper.The study shows that the weight loss rate still remains significant between 1 000 ℃ and 1 600 ℃,in which 4.49% of the lignite and 6.21% of the bituminous coal by weight volatilized.A significant weight loss peak of the lignite between1 200 ℃ and 1 500 ℃ was observed.At the range of 200 ℃to 949 ℃ and 969 ℃,the pyrolysis of bituminous coal and lignite are exothermic respectively.Apart from this,the pyrolysis process was mainly endothermic.The maximum net heat released during the pyrolysis of the bituminous coal and lignite was 728 mJ/mg and 1 776 mJ/mg respectively.Below 800 ℃,the pyrolysis in CO_2 atmosphere has a strong resemblance to that in N_2 atmosphere and the weight losses were also barely different at 800℃.But in CO_2 atmosphere it is barely exothermic below 800℃and became 3-order reaction in contrast to 1-order and 2-order reaction in N_2 atmosphere.
出处
《煤炭转化》
CAS
CSCD
北大核心
2016年第4期15-20,共6页
Coal Conversion
基金
国家重点基础研究发展计划(973)项目(2012CB214906)
关键词
热解
热重
N2气氛
CO2气氛
气化
pyrolysis
thermogravimetry
N2atmosphere
CO2 atmosphere
gasification
