Applying X-ray diffraction, an analysis of crystallite structure on the coal samples from Hami, including raw coal and coals heated respectively at 200°C, 250°C and 300°C, was carried out. The results show: The intensity of the 002 diffraction peak increases, the γ diffraction peak of the coals decreases, the 100 diffraction peak appears and its intensity increases, the size of the crystallite, the stacking height of the aromatic layer and the condensation degree of the aromatic rings increase, and the proportion of the non-crystallite decreases in coal samples, with the temperature increasing at below 300°C.
Applying thermogravimetry coupled with mass spectrometry, a pyrolysis analysis of a long flame coal from Chinese Hami was carried out. The results show: In the temperature range between 400°C and 600°C, the degradation of the carbonaceous matrix and the evolution of relatively high molecular weight species result in the abundant release of CH4, C3H6, C6H6, C7H8, C8H10 and otherwise gas in the coal sample. The weight loss between 400°C and 600°C occupies a main proportion in the total weight loss. In the temperature range between 600°C and 900°C, the condensation of the aromatic ring and the decomposition of mineral matter result in the abundant release of H2, CO2, C6H6 and otherwise gas.
In this paper, based on the theoretical analysis and reasonable simplification, one-dimensional mathematical model is presented for the counter-current oxidation of ventilation air methane. The process of counter-current oxidation reaction is simulated by applying the computational fluid dynamics (CFD) software (Fluent), and the effect of the dominating working parameters (such as flow velocity and equivalence ratio and half cycle) are discussed on the temperature and rate of reaction within the counter-current oxidation reaction. The distribution of the temperature field and the reaction rate are simulated when half cycle is 30s, the equivalence ratio is 0.2 and the velocity 0.06 m/s, 0.1m/s and 0.2 m/s. The combustion characteristics are summarized for the device of counter-current oxidation reaction, and the effects of working parameters are analyzed on the burning characteristics. It is so important to increase the combustion efficiency and energy utilization.
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