A new method is proposed based on temperature-controlled self-reaction to generate and release inhibitors in the form of foam at a specific temperature, which can overcome the disadvantages of short effective time and low efficiency in the inhibition of the spontaneous combustion of coal when inhibitors are released in advance, and greatly increase the action range of inhibitor through foam diffusion. The proposed temperature-controlled foaming system was prepared with hollow spheres as solution carriers, NaHCO3 and acetic acid as basic reactants, reaction-generated CO2 as foaming gas, sodium dodecyl sulfate and sodium carboxymethyl cellulose as foaming additives, NaCl, MgCl2 and CaCl2 as additives to enhance inhibition effect, and temperature sensitive paraffin as insulating material to generate and release inhibitor foam. The effects of releasing foam on restraining the spontaneous combustion of coal were studied based on the experimental analysis of the optimum ratio of reactants and additives, hollow sphere parameters, released temperature of the foam and variation rule of CO generated by coal oxidation. The obtained results showed that the released temperature of foam was 59–61°C and the covered area of pulverized coal by inhibitor foam was 12.9–13.9 times higher than when it was directly wetted by inhibitor solution. The total effects of inhibition and inerting were achieved after pulverized coal was wetted with inhibitor foam and the efficiency of restraining the spontaneous combustion of coal reached 88.51–97.06% when temperature was increased to 160°C.

中文翻译：

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控释泡沫抑制煤自燃的试验研究

提出了一种基于温控自反应在特定温度下以泡沫形式生成并释放抑制剂的新方法，克服了煤自燃抑制有效时间短、效率低的缺点。抑制剂提前释放，通过泡沫扩散大大增加抑制剂的作用范围。以空心球为溶液载体，NaHCO3和乙酸为基本反应物，反应生成的CO2为发泡气体，十二烷基硫酸钠和羧甲基纤维素钠为发泡添加剂，NaCl、MgCl2和CaCl2为添加剂，制备了所提出的控温发泡体系以增强缓蚀效果，以温敏石蜡为绝热材料，产生和释放缓蚀泡沫。通过对反应物与添加剂的最佳配比、空心球参数、泡沫释放温度和煤氧化生成CO的变化规律进行实验分析，研究了释放泡沫对抑制煤自燃的影响。结果表明，泡沫的释放温度为59-61℃，抑制剂泡沫对煤粉的覆盖面积是抑制剂溶液直接润湿时的12.9-13.9倍。煤粉用抑制剂泡沫润湿后达到了缓蚀和惰化的综合效果，当温度升高到160℃时，抑制煤自燃的效率达到88.51-97.06%。