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

Abstract The aim of this study was to analyse the steam gasification process of ‘Janina’ coal with and without Na-, K- and Ca-catalysts. The catalysts were physically mixed with the coal due to the simplicity of this method, short time of execution and certainty that the amount of catalyst is exactly as the adopted one. The isothermal measurements were performed at 800, 900 and 950°C and a pressure of 1 MPa using thermovolumetric method. The obtained results enabled assessment of the effect of analysed catalysts on the process at various temperatures by determination of: i) carbon conversion degree; ii) yield and composition of the resulting gas; and iii) kinetics of formation reactions of main gas components – CO and H2. The addition of catalysts, as well as an increase in operating temperature, had a positive effect on the coal gasification process – reactions rates increased, and the process time was reduced.

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Experimental study of methane-oriented gasification of semi-anthracite and bituminous coals using oxygen and steam in the context of underground coal gasification (UCG): Effects of pressure, temperature, gasification reactant supply rates and coal rank

Fuel ◽

10.1016/j.fuel.2020.117330 ◽

2020 ◽

Vol 268 ◽

pp. 117330 ◽

Cited By ~ 2

Author(s):

Sivachidambaram Sadasivam ◽

Renato Zagorščak ◽

Hywel Rhys Thomas ◽

Krzysztof Kapusta ◽

Krzysztof Stańczyk

Keyword(s):

Experimental Study ◽

Coal Gasification ◽

Coal Rank ◽

Underground Coal Gasification ◽

Bituminous Coals

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Kinetics of heterogeneous reactions with coal in context of underground coal gasification

Fuel ◽

10.1016/j.fuel.2017.02.088 ◽

2017 ◽

Vol 199 ◽

pp. 102-114 ◽

Cited By ~ 10

Author(s):

Ganesh Samdani ◽

Anuradda Ganesh ◽

Preeti Aghalayam ◽

R.K. Sapru ◽

B.L. Lohar ◽

...

Keyword(s):

Coal Gasification ◽

Heterogeneous Reactions ◽

Underground Coal Gasification ◽

Kinetics Of

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A Side Wall Burn Model for Cavity Growth in Underground Coal Gasification

Journal of Energy Resources Technology ◽

10.1115/1.3230894 ◽

1983 ◽

Vol 105 (2) ◽

pp. 145-155 ◽

Cited By ~ 6

Author(s):

T. L. Eddy ◽

S. H. Schwartz

Keyword(s):

Coal Gasification ◽

Cavity Growth ◽

Side Wall ◽

Field Tests ◽

Underground Coal Gasification ◽

Convection Diffusion ◽

Bituminous Coals ◽

Thin Seam ◽

Burn Through ◽

Cavity Width

A mechanistic computer model is presented which predicts the 3-D cavity growth during the gasification phase of underground coal gasification. Developed for swelling bituminous coals, the model also obtains reasonable cavity width and length values for shrinking sub-bituminous coals. The model predicts cavity shape and burn-through times based on the coal properties, seam thickness, water reacting and the interwell distance. Employing a 2-D boundary layer model to determine the convective diffusion rate of oxygen to the reacting walls, it is found that natural convection diffusion must be included. The model includes flow in the injection region, the swirling, mixing effect in the cavity, and transitions from thick to thin seam geometry. Simulations of the Hanna II, Phase 2 and Pricetown I field tests, as well as a parametric study on Pittsburgh seam coal, are presented.

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