煤自燃性的红外光谱研究

Self-ignition propensity of coal with FTIR spectra

煤自燃主要受煤结构和环境因素影响。在确定的粒度与外界条件下,可通过分析煤结构来判断其自燃倾向性。文中根据神府煤及其预氧化产物的红外光谱特征,说明煤的氧化是从一些氧化活性基团开始,且活性基团含量越大越易自燃;提出了通过红外光谱及其差谱分析,对比不同煤种中氧化活性基团的相对含量而预测煤自然发火期的方法;通过对灵武、大柳塔和焦坪煤进行红外光谱分析,得到了它们自燃倾向性的次序,并根据焦坪及大柳塔煤层的自然发火期,确定了灵武煤自然发火期的范围。研究结果与实验模拟及现场观测结果一致,说明用FTIR研究煤的自燃倾向性是可行的。

Coal spontaneous combustion is primarily influenced by coal structure and environmental factors. If particle size and surrounding conditions are certain, coal structure becomes main factor influencing spontaneous combustion. Therefore, spontaneous combustion propensity can be studied through analyzing coal structure. Present study analyzed raw and pre-oxidized samples of SHENFU coal by means of FTIR, which proved that oxidation begins from some active groups readily to be oxidized in the coal. A new method is put forward to test coal spontaneous combustion by analyzing and comparing content of active groups of different coal samples by means of FTIR and FTIR difference spectra. The higher the content of the active groups, the more easily the spontaneous combustion propensity of coal. Coal samples from LINGWU, DALIUTA and JIAOPING are analyzed by means of FFIR and self-ignition propensity order of the samples are got. According to self-ignition duration of JIAOPING and DALIUTA coal, range of self-ignition duration of LINGWU coal is determined. The result of the present study accords with simulation experiment and actual condition well and proved that the method is feasible.