The formation and monitoring of gases associated with spontaneous combustion of coal

Cooper, M., 1991. The formation and monitoring of gases associated with spontaneous combustion of coal. PhD, Nottingham Trent University.

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The analysis of gases associated with the spontaneous combustion of coal was investigated by developing gas chromatographic (GC) methods. This involved a detailed study of chromatographic columns in terms of optimising the selectivity and efficiency of component separation. Selectivity was controlled by modifying the stationary phase, whilst efficiency was varied by altering the physical dimensions of the column. Additionally the detection limits and sensitivity of a number of GC detectors were studied to provide equipment capable of analysing low levels of the gases. This work demonstrated the advantages of photoionisation detectors, which clearly have the potential for monitoring gases in a coal mine atmosphere.

An automated coal oxidation system was configured which allowed the gases formed during the spontaneous combustion of coal to be produced in the laboratory. This equipment automatically monitored temperature profiles and the production of permanent gases during the coal oxidation process. The system also had the capability of dynamically or isothermally oxidising coal samples. The frequent abstraction of gas samples from this system followed by GC analysis allowed the evolution profiles of these gases to be monitored. The evolution profiles of gases formed from the dynamic oxidation of coal provided information on the usefulness of these gases as indicators of spontaneous combustion. Carbon monoxide is currently used to indicate spontaneous combustion. This work suggested that ethene, propene, acetaldehyde, acetone and carbonyl sulphide are also useful indicators of spontaneous combustion. A variety of other gases were demonstrated to be desorption products by repeating the experiments using nitrogen carrier gas.

The production rate of gases evolved from isothermal coal oxidation allowed kinetic constants, including the activation energy and reaction order of formation to be calculated. This information demonstrated that acetone, acetaldehyde and carbonyl sulphide were formed by similar reaction mechanisms to carbon monoxide. This work further validated the use of these gases as other indicators of spontaneous combustion.

Item Type: Thesis
Creators: Cooper, M.
Date: 1991
ISBN: 9781369324181
Divisions: Schools > School of Science and Technology
Record created by: Linda Sullivan
Date Added: 10 Nov 2020 16:51
Last Modified: 11 Oct 2023 09:13

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