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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/4087

Title: Fluidized bed gasification of selected South African coals
Authors: Engelbrecht, AD
Everson, RC
Neomagus, HWPJ
North, BC
Keywords: Coal
Gasification
Fluidized bed
Integrated gasification combined cycles
IGCC
Thermogravimetric analyser
TGA
Issue Date: May-2010
Publisher: The Southern African Institute of Mining and Metallurgy
Citation: Engelbrecht, AD,Everson, RC,Neomagus, HWPJ, and North, BC. 2010. Fluidized bed gasification of selected South African coals. Journal of the Southern African Institute of Mining and Metallurgy, Vol. 110(5), pp 225-230
Abstract: An investigation was undertaken to ascertain the suitability of four selected low grade, South African coals for gasification in a bubbling fluidized bed for production of synthesis gas and for the development of integrated gasification combined cycles (IGCC). This study consisted of the characterization of the coals, laboratory evaluation of intrinsic reactivity, and experimentation with a pilotplant fluidized bed gasifier. Results of the characterization experiments show that the selected coals are high in ash, rich in inertinites, very dense (low porosity), with low caking indices and high ash fusion temperatures. Reactivity measurements with a thermogravimetric analyser (TGA), under reaction rate controlling conditions with carbon dioxide, showed that the reactivity of the coal chars decreases with increase in rank of the coal, as expressed by the vitrinite random reflectance and carbon content of the parent coals. The fixed carbon conversion achieved in the fluidized bed gasifier also correlates well with the rank parameter of the coal, with higher conversions being obtained with the lower rank coals. Thermal shattering and attrition of the coal particles produce significant amounts of fines, which correlate with the grindability indices, and no agglomeration (non-caking) was observed. It is concluded that fluidized bed gasifiers are able to utilize typical low grade, high ash South African coals for synthesis gas production and for inclusion in integrated gasification combined cycles for power generation.
Description: Copyright: 2010 The Southern African Institute of Mining and Metallurgy. This is a post print version. The definitive version was published in the Journal of of the Southern African Institute of Mining and Metallurgy, Vol. 110(5), pp 225-230
URI: http://hdl.handle.net/10204/4087
ISSN: 0038–223X
Appears in Collections:Mining and geoscience
Climate change
Manufacturing science and technology
General science, engineering & technology

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