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SOM’s Effect on Coal Spontaneous Combustion and Its Inhibition Efficiency

机译：SOM对煤自燃的影响及其抑制效率

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As an important part of coal, the existence of soluble organic matters (SOMs) has its own impact on the number of active groups within coal and its pore and fracture structure, which have influence on both spontaneous combustion and inhibitory effect of coal. But some in-depth researches are still lacking on this matter. On the basis of testing the composition of SOMs and analyzing the change of coal's pore and fracture structure, we conducted an oxidation experiment on model compounds stimulating SOMs, and coal's spontaneous combustion inhibition experiment before and after extraction. By testing characterization parameters like oxygen consumption rate, activation energy, inhibition rate, and the crossing point temperature, we analyzed how SOMs make a difference on spontaneous combustion and inhibitory effect of coal. It shows that, after the extraction of SOMs, both the amount and rate of oxygen consumption of coal goes down, while the activation energy of coal ascends after extraction. Once being added with model compounds stimulating SOMs, coal's oxidation degree increases. Between 50 degrees C and 140 degrees C, the inhibition rates of ZHCM, ZHYM, and CTM range from 50.7% to 71.2%, 40.1% to 52.0%, and 18.1% to 27.6%, respectively, and residual coals' inhibition rates surpass raw coals' inhibition rates. The crossing point temperature of ZHCM reached 122.5 degrees C, 35.2 degrees C higher compared to that of YM. This shows that adding inhibitors after extract can have a strong effect on restraining coal's spontaneous combustion. Through free radical reaction and oxidation reaction, SOMs would release the heat to hasten the coal's oxidation process. After extraction, coal's permeability increases, which makes it easier for an inhibitor to seep into coal, thereby restraining the intensity of coal's oxidation.
机译：作为煤的重要组成部分，可溶性有机物（SOM）的存在对煤中活性基团的数量及其孔隙和断裂结构有自己的影响，既影响煤的自燃又具有抑制作用。但是，在此问题上仍缺乏一些深入的研究。在测试SOMs的组成并分析煤的孔隙和裂缝结构变化的基础上，我们进行了模拟刺激SOMs的化合物的氧化实验，以及提取前后煤的自燃抑制实验。通过测试表征参数，例如耗氧率，活化能，抑制率和交叉点温度，我们分析了SOM如何对煤的自燃和抑制作用产生影响。结果表明，提取SOM后，煤的耗氧量和耗氧率均下降，而煤的活化能在提取后上升。一旦加入刺激SOM的模型化合物，煤的氧化度就会增加。在50摄氏度至140摄氏度之间，ZHCM，ZHYM和CTM的抑制率分别为50.7％至71.2％，40.1％至52.0％和18.1％至27.6％，并且残留煤的抑制率超过了原煤。煤的抑制率。 ZHCM的交叉点温度达到122.5摄氏度，比YM高35.2摄氏度。这表明在提取物后添加抑制剂可有效抑制煤的自燃。通过自由基反应和氧化反应，SOM将释放热量以加速煤的氧化过程。提取后，煤的渗透性增加，这使得抑制剂更容易渗入煤中，从而抑制了煤的氧化强度。

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