水溶性细泡沫灭火剂（DTE）为新型环保型水系灭火剂，具有优良的降温、隔氧、环保等性能。本文结合微观和宏观两方面，通过系列实验，考察了DTE抑制烟煤自燃的效果，为煤自燃阻化剂的选择提供新的思路。

本文首先研究了DTE对烟煤微观结构的影响。采用扫描电镜和能谱分析仪，测试了煤经DTE处理后表面微观结构的变化，得出DTE在煤表面形成了紧密的膜，可以隔绝煤与氧气的接触。并采用傅里叶变换红外光谱技术，探索了DTE对煤中活性官能团数量的影响。研究结果表明，煤中添加了DTE后，游离羟基的数量增加，脂肪烃官能团含量减少，升温过程中醚氧键和芳香键的断裂或生成有所抑制。

通过热物性参数测试和同步热分析仪实验，测试了DTE添加量对煤氧化过程中热效应的影响。实验发现：对比原煤样，添加DTE阻化液的煤样的热扩散系数和导热系数降低，比热容增加；在失重过程中没有明显的吸氧增重过程，干裂温度点延后；低温阶段有大量的吸热现象，初始放热温度点滞后150℃以上，净放热量减少；少量的添加量即可较好的抑制煤自燃；DTE添加越多，抑制煤自燃能力越强。

然后在上面研究的基础上，选用三种常用阻化剂在相同条件下进行同步热分析实验，对比发现，DTE煤样的干裂温度延后最明显，且其在煤氧化初期吸热效果明显优于所选阻化剂。通过各处理煤样在受热分解和燃烧阶段的活化能计算，得出氯盐阻化剂在该阶段促进了煤氧复合反应的进行，而DTE在该阶段对煤分子起惰化作用。

最后利用煤自燃降温模拟实验台进行了高温松散煤体内DTE降温实验，得到DTE注入过程中及停止注入后松散煤体内各测点降温规律，得出DTE注入时会产生泡沫，注入口附近以及泡沫渗流区域温度下降明显，容器内上面部分煤体的降温效果高于下部分。

Dissolvable tiny-foam extinguisher（DTE） is environmental, high in thermal stability, and fast in cooling. In view of the good performance of the material, the inhibition effects of DTE on coal spontaneous combustion are investigated through experimental tests. This paper studys the influence of DTE on the microstructure and the heat release of bituminous coal coal during the heating process. This research explores the effect of DTE on the inhibition of coal oxidation combining the micro and macro aspects and provides new ideas for the selection of coal spontaneous combustion inhibitors.

This article first studys the influence of DTE on the microstructure of bituminous coal. Using scanning electron microscope and energy spectrum analyzer to analyze the changes in the surface microstructure of coal after DTE treatment, it is concluded that the dense film formed by DTE on the coal surface can isolate the contact between coal and oxygen, thereby delaying the process of coal-oxygen composite reaction. And Fourier infrared spectroscopy technology is used to explore the effect of DTE on the number of active functional groups in coal molecules. The research results show that DTE reduces the content of aliphatic hydrocarbon functional groups with higher reactivity and prevents the breakage or formation of ether oxygen bonds and aromatic bonds during the heating process.

    The influence of DTE dosage on the thermal effect of coal oxidation process is tested by thermal property parameter test and synchronous thermal analyzer experiment. The experimental results show that DTE can reduce the thermal diffusion coefficient and thermal conductivity and increase the specific heat capacity. Compared with raw coal sample, there is no obvious process of oxygen absorption and weight gain in the process of weightlessness of DTE treated samples, the dry cracking temperature point delays. Besides, a lot of heat absorption phenomenon occurs at low temperature stage, the initial heat release temperature lag more than 150℃, and the net heat release reduced during the heating process of DTE treated samples. A small amount of addition can inhibit coal spontaneous combustion well. The more DTE is added, the stronger the ability of inhibiting coal spontaneous combustion is.

Based on the above research, three chloride salt inhibitors are choosen to conduct synchronous thermal analysis experiments under the same conditions. It is found by comparison that the dry cracking temperature of DTE treated coal sample delays most obviously. Better than chlorine salt inhibitor, DTE has obvious endothermic effect in the initial stage of coal oxidation. Through the calculation of the activation energy of each sample during the thermal decomposition and combustion stage, it is concluded that the chloride salt inhibitors promote the coal-oxygen reaction at this stage, while DTE inerts the coal molecules.

Finally, using the coal spontaneous combustion cooling simulation experiment platform, the DTE cooling experiment in the loose coal is carried out, and the cooling law of each test during the DTE injection process and after the injection point in the loose coal is obtained. The analysis shows that foam generates when DTE is injected, and the temperature near the injection port and the foam seepage area drops significantly, and the cooling effect in the upper part of the coal in the container is higher than that of the lower part.

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