摘要
用水热提质的方法对我国两种典型低阶煤进行脱水提质,提质后低阶煤的水分含量大幅度下降、固定碳含量和热值升高.低阶煤经过提质后裂解特性曲线向高温方向移动,挥发分开始析出温度升高,昭通煤和准东煤的最大失重速率呈现不同的变化趋势,裂解最终失重率随着水热提质温度的升高而降低.通过对脱灰后低阶煤的裂解特性分析,发现脱灰过程可以增大低阶煤的裂解失重速率,而水热提质过程对低阶煤裂解特性的主要影响是减少低阶煤的轻质组分,使低阶煤的失重峰变窄.
Two low rank coals were dewatered and upgraded by hydrothermal dewatering process in this article.Water concentration of the upgraded coals decreased a lot,while the fixed carbon content and heat value increased.The pyrolysis characteristics curves of upgraded coals were delayed towards the high temperature region.The pyrolysis start temperature increased and the maximum mass loss rate of upgraded Zhaotong coal and Zhundong coal present a different variation trend through hydrothermal dewatering.The mass loss of both Zhaotong coal and Zhundong coal decreased along with the increasing hydrothermal dewatering temperature.The pyrolysis characteristics analysis was also conducted on deashed low rank coals.Results indicated that the deashed process could increase the mass loss rate of pyrolysis effectively and the main effect of hydrothermal dewatering process was to reduce the active component of low rank coals and narrow the mass loss peak of low rank coals.
出处
《煤炭转化》
CAS
CSCD
北大核心
2016年第1期12-16,25,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
低阶煤
水热提质
脱灰
裂解特性
low rank coal
hydrothermal dewatering
deashed process
pyrolysis characteristics
