Citation: LEI Ming, SUN Cen, WANG Chun-bo. The crystal structure of coal char and the mineral transformation of coal ash during coal conversion under pressurized conditions[J]. Journal of Fuel Chemistry and Technology, ;2018, 46(8): 925-933. shu

The crystal structure of coal char and the mineral transformation of coal ash during coal conversion under pressurized conditions

School of Energy Power and Mechanical Engineering, North China Electric Power University, Baoding 071003, China

Corresponding author: LEI Ming, ncepu_lm@126.com
Received Date: 9 February 2018
Revised Date: 2 May 2018

Fund Project: Fundamental Research Funds for the Central Universities 2017MS120The project was supported by Hebei Province Natural Science Foundation (E2016502094) and Fundamental Research Funds for the Central Universities (2017MS120)Hebei Province Natural Science Foundation E2016502094

Figures(8)

The influence of pressure (0.1-6 MPa) on the mineral phase of coal char and the carbon crystal structure and the mineral conversion of coal ash were investigated by using the tube furnace at higher temperature and pressure combined with the analysis of X-ray diffractometer (XRD) and Fourier transform infrared (FT-IR) spectroscopy. The results indicate that the mineral phase of coal char is not significantly affected by the pyrolysis pressure; while, the average stacking height or the graphitization degree of coal char increases with increasing the temperature and pressure. With respect to functional groups, the pressure has little effect on the structure of organic functional group. Also, it is found that the pressure has little effect on the main mineral phases of coal ash, but it can affect the relative contents of mineral phases, which is mainly due to the varying of combustion temperatures caused by the transition of the ignition mechanism at different pressures. The effect of temperature on the mineral transformation is more significant than that of pressure.
- char,
- ash,
- mineral phase,
- crystal structure,
- organic functional group,
- high temperature and high pressure
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