Low-temperature oxidation of coal at elevated pressures

H. Wang; B.Z. Dlugogorski; E.M. Kennedy

doi:10.1016/S0950-4230(98)00020-5

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Low-temperature oxidation of coal at elevated pressures

Journal article

Peer reviewed

Low-temperature oxidation of coal at elevated pressures

H. Wang, B.Z. Dlugogorski and E.M. Kennedy

Journal of Loss Prevention in the Process Industries, Vol.11(6), pp.373-381

1998

DOI: https://doi.org/10.1016/S0950-4230(98)00020-5

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Abstract

A mathematical model is presented to describe steady-state mass transfer and oxidation processes in coal at low temperatures in a fixed-bed flow reactor. The model incorporates the effects of partial pressure of oxygen, temperature and coal particle size, and accounts for the rate of coal oxidation and the composition of oxygenated products at high pressures. This is an important development since previous models did not include the effect of pressure in their formulation. It is found that, when the partial pressure of oxygen increases the rate of oxygen consumption increases accordingly. However, the influence of partial pressure of oxygen on the rate of oxidation is less pronounced when the pressure surpasses 1 MPa. In addition the model predicts that, for a constant partial pressure of oxygen, higher rates of oxygen consumption occur at lower total pressures. The same trends are also found for the concentration of oxygenated products at the reactor outlet. It is suggested that, the variation of partial pressure of oxygen leads to different concentration levels of oxygen at the surface and within the pores of coal particles, substantially affecting the rate of oxidation.

Details

Title: Low-temperature oxidation of coal at elevated pressures
Authors/Creators: H. Wang (Author/Creator)
B.Z. Dlugogorski (Author/Creator)
E.M. Kennedy (Author/Creator)
Publication Details: Journal of Loss Prevention in the Process Industries, Vol.11(6), pp.373-381
Publisher: Elsevier BV
Identifiers: 991005540557907891
Murdoch Affiliation: Murdoch University
Language: English
Resource Type: Journal article

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Citation topics: 7 Engineering & Materials Science; 7.139 Energy & Fuels; 7.139.1964 Spontaneous Combustion
Web Of Science research areas: Engineering, Chemical
ESI research areas: Chemistry