Kinetics of steam gasification of bituminous coals in terms of their use for underground coal gasification

• Examinations of high pressure kinetics of coal gasification with steam
• The kinetic curves and yields of gasification products and carbon conversion degrees are presented.
• Kinetic parameters of carbon monoxide and hydrogen formation reaction were calculated.
• Results enable a preliminary assessment of coal for the process of underground coal gasification.

The kinetics of steam gasification was examined for bituminous coals of a low coal rank. The examined coals can be the raw material for underground coal gasification. Measurements were carried out under isothermal conditions at a high pressure of 4 MPa and temperatures of 800, 900, 950, and 1000 °C. Yields of gasification products such as carbon monoxide and carbon dioxide, hydrogen and methane were calculated based on the kinetic curves of formation reactions of these products. Also carbon conversion degrees are presented. Moreover, calculations were made of the kinetic parameters of carbon monoxide and hydrogen formation reaction in the coal gasification process. The parameters obtained during the examinations enable a preliminary assessment of coal for the process of underground coal gasification.