In order to study the effect of gelling foam on coal inhibition,the influence of gelling agent on the stability of gelling foam was discussed from the microscopic point of view,and the morphology characteristics of three different types of gel foam were compared with the film forming effect of coal surface covering.The effects of ash particles on the foam viscosity,shear stress and yield stress of gel foam were examined by measuring the rheological properties of materials at different water-cement rati-os.And the fire-fighting performance of the gel foam was studied by temperature programmed experi-ment and thermogravimetric experiment.The results show that the appropriate gel concentration is con-ducive to the stable existence of the foam.When the concentration of gelling agent is 0.6％,the micro-morphology and basic parameters of the gel foam are the best.The film forming effect of gel-foam cover-ing coal surface is the best,and a complete protective film can still be formed on coal surface within 7 days.With the decrease of water-cement ratio,the shear stress and viscosity of the gel foam gradually increase,and the foam is more difficult to flow when the water-cement ratio is 2:1.The critical temper-ature T1 increased to 72 ℃ and the cracking temperature T2 increased by 30 ℃,which effectively in-hibite the coal oxidation process.At 100℃,the inhibition rate of the foam reaches 63.6％.This new foam fire prevention technology provides a new possibility for coal spontaneous combustion prevention and control,and a new idea for solid waste resource utilization.
关键词
防灭火/气化灰渣/凝胶泡沫/流变特性/凝胶剂
Key words
fire prevention/gasification ash/gel foam/rheological properties/gelling agent
维普
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