摘要
为深入探究采空区遗煤水浸后的自燃特性以及MgCl_(2)阻化剂对浸水煤氧化的抑制效果,利用煤体低温氧化实验系统和傅里叶红外光谱仪,分析原煤及浸水30、90、150 d煤样及在MgCl_(2)阻化剂影响下的官能团变化规律。实验结果显示,浸水时间越长,脂肪烃含量越多,煤体的低温氧化活性就越强,阻化剂抑制效果逐渐减弱;随着浸水时间的增加,—CH_(2)、—CH_(3)、—OH与—COOH含量的降低幅度逐渐扩大,C=O含量的增长幅度逐渐增加。在氧化升温的早期阶段,MgCl_(2)阻化剂对煤氧化过程的抑制效果较好,后期阻化效果降低,对煤氧化过程的抑制效果逐渐减弱。当煤浸水的时间越久,风干煤体的氧化活性就越强,产生CO浓度也越高,而MgCl_(2)阻化剂对煤氧化的抑制效能也在随时间流逝而减弱。基于以上发现,建议在采空区加强温度监测,并对长期浸水后风干的煤层实施定期补充MgCl_(2)阻化剂,加强对煤氧化过程的抑制效果,防止采空区浸水风干煤层发生自燃。
This study delves into the spontaneous combustion characteristics of residual coal in goaf after water immersion and the inhibitory effects of MgCl_(2)inhibitor on the oxidation of coal soaked in water.Utilizing a low temperature coal oxidation experimental system and Fourier Transform Infrared Spectroscopy(FTIR),we analyzed the variations in functional groups of original coal samples and those immersed for 30,90,and 150 days,as well as under the influence of MgCl_(2).Experimental result show that the longer the immersion time and the higher the content of fatty hydrocarbons,the stronger the low temperature oxidation activity of the coal body,and the inhibitory effect of the inhibitor gradually weakens.As the immersion time increases,the decrease in—CH_(2),—CH_(3),—OH,and—COOH content gradually expands,while the increase in C=O content gradually increases.In the early stage of oxidation and heating up,MgCl_(2)inhibitor has a better inhibitory effect on the coal oxidation process,but its inhibitory effect decreases in the later stage,and its inhibitory effect on the coal oxidation process gradually weakens.The longer the coal is immersed in water,the stronger the oxidation activity of the air-dried coal,and the higher the concentration of CO produced.The inhibitory effect of MgCl_(2)inhibitor on coal oxidation also weakens over time.Based on the above findings,it is suggested to enhance temperature monitoring in goaf and periodically supplement MgCl_(2)inhibitors to long-term water-immersed and subsequently air-dried coal layers,thus reinforcing the suppression of coal oxidation processes and preventing spontaneous combustion in such coal seams within the goaf.
作者
赵瑞旭
赵波
Zhao Ruixu;Zhao Bo(Yunnan Mile Qisheng Energy Group Co.,Ltd.,Mile 652300,China;Henan Coal Science Research Institute Co.,Ltd.,Zhengzhou 450001,China;Henan Coal Research Institute Testing Technology Co.,Ltd.,Zhengzhou 450001,China)
出处
《能源与环保》
2024年第5期36-44,共9页
CHINA ENERGY AND ENVIRONMENTAL PROTECTION
基金
国家自然基金面上项目(52274199)。
关键词
阻化剂
浸水煤
低温氧化
官能团
CO浓度
inhibitor
coal soaked in water
low temperature oxidation
functional groups
CO concentration
