低温氧化对新疆烟煤结构及热力学性能的影响

Influence of low temperature oxidation on Xinjiang bituminite's structure and thermodynamic property

为减小或避免低温氧化造成的影响,并丰富煤的低温氧化理论,研究了低温氧化对新疆焦煤集团艾维尔沟煤矿的中生代侏罗纪烟煤的结构及热力学性能的影响。用衰减全反射傅里叶变换红外光谱仪直接测定了氧化前后煤样中镜质组和惰质组的红外光谱。烟煤中惰质组和镜质组具有相同的基团,但镜质组中各基团的含量明显高于惰质组。双氧水氧化后,煤的发热量减少;煤样中羟基、亚甲基的含量先增大后减小;羰基含量先减小后增大。镜质组的变化较小,惰质组中羟基、羰基含量减少,羧基含量基本不变,而苯环和C—O—C的含量均略有升高。双氧水氧化对烟煤热力学性能的影响较小,氧化后样品的热重曲线向低温区域稍微移动。

In order to reduce or avoid the influence of low temperature oxidation and enrich low temperature oxidation theory of coal, Mesozoic Jurassic bituminite in the Aiweiergou Mine of Xinjiang Coking Coal Group was taken as a re- search object to investigate the influence on its structure and thermodynamic properties during low-temperature oxida- tion in this paper. Directly detected the FTIR of vitrinite and inertinite with attenuated total reflectance micro-Fourier transform infrared（ATR-FTIR） spectroscopy was more convenient than the traditional method which firstly separated vitrinite and inertinite from coal and then detectd their FTIR. Vitrinite and inertinite have the same radical groups. Radical groups＇ content in vitrinite is significantly higher than that in inertinite. After peroxide oxidation, the calorific value of coal decreases;peak intensity of --OH and methylene increases at first and then reduces;peak intensity of carbonyl reduces at first and then increases. The vitrinite has little changes. In inertinite, the peak intensity of --OH and carbonyl reduces, carboxyl relatively unchanges, peak intensity of aromatic ring and C--O--C increase slightly. Hydrogen peroxide oxidation alteres less the thermodynamic properties of the bituminite. Thermogravimetric curve slightly moves to low temperature zone after peroxide oxidation.