摘要
用热分析法研究了新型凝胶对煤的阻化性能,对凝胶防治煤炭自燃具有重要意义。采用STA449C型热分析仪,对新型凝胶的固水性和热特性进行定量分析,然后采用计算着火活化能对比分析了新型凝胶、MgCl2和水玻璃阻化剂对淮北气肥煤、义马长焰煤和阳泉无烟煤阻化性能的影响。结果表明:新型凝胶固水率可达86.6%以上;凝胶在86.8℃之前物理阻化性能为最佳状态;当温度升高到126.5℃时,新型凝胶失水半衰期为10.75 min,为凝胶阻化时效长短提供了参考依据;凝胶可以隔绝煤与O2的接触,抑制煤氧化反应速率,凝胶中的金属离子被松散煤体化学吸附,抑制煤氧反应过程中自由基链式反应,其阻化效果为长焰煤>气肥煤>无烟煤,即阻化效果随着煤变质程度的升高而降低。
In this paper,it studied the inhibition characteristics of new gel on coal by thermal analysis,which was significant for preventing coal spontaneous combustion with gel.By using thermal analyzer STA449C,it made quantitative analysis for water solidification and thermal characteristics of the new gel,then it made comparative analysis for the effect of the new gel,MgCl2 and sodium silicate inhibitor on the inhibition performance of Huaibei gas fat coal,Yima long flame coal and Yangquan anthracite.The results indicated that solid water rate of the new gel was above 86.6% and its physical inhibition performance was the best before 86.8 ℃.When the temperature was raised to 126.5 ℃,the new gel dehydration half-life was 10.75 min,which provided a reference for the gel inhibition aging length.The gel could be used to prevent the contact of coal with oxygen and inhibit oxidation rate of coal,and metal ions in the gel was absorbed chemically by loose coal to inhibit free radical chain reaction during the coal oxygen reaction.The inhibition effect was that long flame coal＆gt;gas fat coal＆gt; anthracite,which decreased with the increase of coal metamorphism.
出处
《煤矿安全》
CAS
北大核心
2013年第4期31-34,共4页
Safety in Coal Mines
基金
教育部长江学者和创新团队发展计划资助项目(IRT0618)
国家安监总局煤矿安全生产科技发展计划资助项目(08-149)
河南省基础与前沿技术研究计划资助项目(082300463205
09230041004)
河南省教育厅自然科学基金资助项目(2007620004)
关键词
凝胶
热分析
固水性
阻化
gel
thermal analysis
water solidification
inhibition
