摘要
为防治煤矿顶煤和上分层遗煤自燃等高位火源灾害,以工业固废物磷石膏为基料,加入碳酸氢钠和聚丙烯酰胺等成分,制备出一种自产气膨胀浆体。首先,应用热重(TG)分析仪研究浆体在不同升温速率下的热稳定性;然后,采用自行搭建的隔热性能测试系统测试浆体的隔热性;最后,通过灭火试验研究浆体的灭火降温性能。结果表明:磷石膏基自产气膨胀浆体在160℃以下时存在35%~46%的质量损失,当温度大于160℃时,浆体的质量分数不再发生改变;浆体堆积厚度达到30 mm时,有效隔热时间超过139 min,可实现对煤自燃危险区域较好的覆盖;浆体通过在煤堆裂隙中膨胀扩散,自下而上完全包裹碎煤,隔绝氧气,具有良好的降温灭火性能,注浆36 min后,各点位温度已全部降低至50℃以下,未出现复燃现象。
In order to prevent high-level fire hazards such as spontaneous combustion of top coal and upper layer residual coal,a self-produced gas expansion slurry was prepared by taking industrial solid waste phosphogypsum as the base material,adding components such as sodium bicarbonate and polyacrylamide.Firstly,a thermogravimetry(TG)analyzer was used to study the thermal stability of the slurry at different heating rates.Then,a self-built insulation performance testing system was used to test the thermal insulation performance of the slurry.Finally,the fire extinguishing and cooling performance of the slurry was studied through fire extinguishing experiments.The results show that when the temperature of phosphogypsum based self-produced gas expansion slurry is below 160℃,there is a mass loss of 35%to 46%in the slurry.When the temperature is above 160℃,the mass fraction of the slurry no longer changes.The thickness of the slurry accumulation reaches 30 mm,and the effective insulation time exceeds 139 min,which can achieve good coverage of coal spontaneous combustion hazardous areas.The slurry expands and diffuses in the cracks of the coal pile,completely enveloping the broken coal from bottom to top,isolating oxygen,and having good cooling and fire extinguishing performance.After 36 min of grouting,the temperature at all points has been decreased to below 50℃,and no reignition phenomenon has occurred.
作者
吴芳华
施式亮
鲁义
谷旺鑫
谭嘉乐
刘蔚廷
WU Fanghua;SHI Shiliang;LU Yi;GU Wangxin;TAN Jiale;LIU Weiting(School of Resources,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan Hunan 411201,China)
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2024年第3期148-154,共7页
China Safety Science Journal
基金
国家自然科学基金资助(52274196,52174180,52374200)
国家重大人才工程青年项目(2022QB06801)
湖南省重点研发计划项目(2022GK2042)。
关键词
磷石膏基自产气膨胀浆体
煤自燃
热稳定性
隔热性能
灭火降温
有效隔热时间
phosphogypsum based self-produced gas expansion slurry
coal spontaneous combustion
thermal stability
thermal insulation performance
fire extinguishing and cooling
effective insulation time
