含XG/HPMC粉煤灰胶体抑制煤自燃特性的实验研究  

Experimental study on the characteristics of fly ash colloid containing XG/HPMC to inhibit coal spontaneous combustion

作　　者：王慧 苏晓军[2] 刘西西 王建 张佳敏 WANG Hui;SU Xiaojun;LIU Xixi;WANG Jian;ZHANG Jiamin(College of Safety Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,China;Huafeng Coal Mine of Xinwen Mining Group,Tai'an 271219,China;Baodian Coal Mine,Yankuang Energy Group Company Limited,Zoucheng 273513,China)

机构地区：[1]西安科技大学安全科学与工程学院,陕西西安710054 [2]新汶矿业集团华丰煤矿,山东泰安271219 [3]兖矿能源集团股份有限公司鲍店煤矿,山东邹城273513

出　　处：《煤矿安全》2024年第9期100-109,共10页Safety in Coal Mines

基　　金：陕西省教育厅青年创新团队科研计划资助项目(22JP047)。

摘　　要：粉煤灰灌浆是一种常用的矿井火灾防治手段。针对粉煤灰浆液易失水开裂、稳定性差、防灭火效率低等问题,通过向粉煤灰浆液中添加高分子聚合物黄原胶(XG)和羟丙基甲基纤维素(HPMC)制备粉煤灰胶体,测试不同水灰比粉煤灰胶体的成胶时间、保水性和热稳定性等参数,采用程序升温研究胶体抑制煤自燃效果。结果表明:当粉煤灰浆液水灰比为10∶1时,成胶时间为9.52 min,保水性能及静态稳定性良好;粉煤灰胶体呈现非牛顿流体的剪切稀化现象,储能模量G′均高于损耗模量G″,为符合幂律模型的假塑性流体,表现出类弹性的固体性质;粉煤灰胶体加热失重过程可分为3个阶段(30~100、218~380、380~800℃),总质量损失约为6.17%;粉煤灰胶体具有含水率高、隔绝氧气及封堵裂隙的作用,经阻化后煤样的阻化率为75.86%,CO、C_(2)H_(4)气体产生对应的温度点较原煤推后30、20℃,煤自燃过程得到了有效抑制。Fly ash grouting is a common method for mine fire prevention and control. Aiming at the problems of fly ash slurry which is prone to water-loss cracking, poor stability and low fire prevention efficiency, fly ash colloids were prepared by adding high molecular polymer xanthan gum(XG) and hydroxypropyl methyl cellulose(HPMC) to fly ash slurry, and the gel formation time, waterretaining property and thermal stability of fly ash colloids with different water-cement ratios were tested. The effect of colloid on the inhibition of coal spontaneous combustion was studied by programmed temperature. The results showed that when the water-cement ratio of fly ash slurry was 10∶1, the glue formation time was 9.52 min, and the water-retaining property and static stability were good. The fly ash colloid exhibited the shear dilution phenomenon of non-Newtonian fluid, and the energy storage modulus G′ was higher than the loss modulus G″. It was a pseudo-plastic fluid conforming to the power law model, and exhibited the properties of elastic solid. The weight loss process of fly ash colloidal heating can be divided into three stages(30-100 ℃, 218-380 ℃ and 380-800 ℃), and the total mass loss was about 6.17%. Fly ash colloid had the function of high moisture content, oxygen isolation and fissure sealing. The inhibition rate of coal sample after inhibition was 75.86%, and the corresponding temperature point of CO and C_(2)H_(4) gas generation were 30 ℃ and 20 ℃ later than that of raw coal. The spontaneous combustion process of coal had been effectively inhibited.

关 键 词：粉煤灰 煤自燃 胶凝特性 流变特性 稳定性 黄原胶 

分 类 号：TD752.2[矿业工程—矿井通风与安全]