摘要
通过爆裂过程中起始爆裂时间和持续爆裂时间以及型煤微观形态,探讨了水分、成型压力、混合比例(质量比)和温度对煤泥型煤爆裂行为的影响.结果表明:水分的蒸发是影响煤泥型煤发生爆裂的重要原因;成型压力通过影响煤泥型煤的内部结构进而影响爆裂,成型压力越大,结构越致密,产生的气体越易在煤泥型煤内部集聚,从而越易发生爆裂;煤泥和石灰石混合比例对爆裂行为的影响,主要通过不同混合比例引起的煤泥型煤的结构及成分的变化发挥作用,高质量分数的石灰石形成的煤泥型煤结构更致密,传热速率更快,更有利于爆裂的发生;温度对爆裂行为的影响主要体现在对煤泥型煤内外温度梯度的影响,进而从热应力与化学反应两方面影响爆裂特性.
The effects of moisture,pressure,mixing ratio(mass ratio)and temperature on the cracking behavior of coal slime briquette through initial crack time and continuous crack time and micromorphology of briquette were investigated.The results show that water evaporation is an important process during coal slime briquette cracking.The pressure has an influence on the cracking by affecting the internal structure of coal slime briquette and the briquette becomes compacted under the increasing pressure.It results in the gathering of produced gas,thus the briquette is more prone to crack.The mixing ratio of coal slime and limestone affects the cracking behavior by changing the structure and composition of coal slime briquette.High mass fraction of limestone in coal slime briquette has more compact structure and the heat transfer rate is higher,which is helpful for cracking.The influence of temperature on cracking behavior is reflected in temperature gradient between inside and outside of briquette.Furthermore,the cracking characteristics are affected by two aspects of thermal stress and chemical reaction.
作者
李永茂
赵江婷
张圆圆
杨凤玲
张培华
何利昌
程芳琴
LI Yongmao;ZHAO Jiangting;ZHANG Yuanyuan;YANG Fengling;ZHANG Peihua;HE Lichang;CHENG Fangqin(Shanxi Pingshuo Coal Gangue Power Generation Limited Liability Company,036000 Shuozhou, China;Institute of Resources and Environment Engineering,Shanxi University,State Environmental Protection Key Laboratory of Efficient Utilization Technology of Coal Waste Resources,Shanxi Collaborative Innovation Center of High Value-added Utilization of Coal-related Wastes, 030006 Taiyuan,Ch)
出处
《煤炭转化》
CAS
CSCD
北大核心
2018年第3期50-58,共9页
Coal Conversion
基金
山西省应用基础研究计划项目(201701D221219)、山西省煤基重点科技攻关项目(MD2015-01)、山西省重点研发计划(国际合作)项目(201603D421041)和山西省重点研发计划重点项目(201703D111018).
关键词
煤泥
石灰石
型煤
爆裂行为
微观形貌
coal slime
fine limestone
briquette
cracking behavior
micromorphology
