E304 CHAR MORPHOLOGY FROM THE AUTOMATED REFLECTOGRAM OF A COAL AND ITS IMPLICATIONS ON BURNOUT AND ASH FORMATION

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The paper presents the on-going research in accounting for heterogeneous nature of organic matter in pulverised coal. This is achieved by using the information from automated reflectogram technique developed at CSIRO Australia. The technique is seen as providing opportunities for characterizing coal in a way which, for the first time, will allow the heterogeneous nature of coal to be related to reactivity, ash formed and fine ash generation. All these aspects of coal utilization are related with char character. The aim of the research is, therefore, to correlate the char character to the reflectance of an individual coal particle. The coal is considered as a mixture of particles of different character in terms of chemical and physical properties. In the present work, the reflectance is considered as the main characterizing parameter for the organic matter in coal. All the bulk properties of coal or char can be obtained from the summation of the properties of individual particles. For example, each individual coal particle devolatilises to a different extent resulting in a distinct char particle. The properties of these char particles vary monotonously with reflectance. A correlation was obtained for volatile matter as a function of reflectance in such a way that the volatile mater could be obtained from the reflectogram analysis using this relationship. This approach is extended to char character. Char was produced from several coal samples and maceral concentrates in a drop tube furnace at 1400C. The porosity and average thickness of the char particles were estimated from image analysis. Coal particles with low reflectance are expected to result in porous and thin-shelled char particles. The was observed qualitatively in these char samples. A relationship between reflectivity/reflectance of coal particles and the porosity of the resulting char particles is obtained from regression analysis. This relationship is very important in modeling combustion of char particles and ash formation. The effect of char morphology on burnout is demonstrate using CBK7,a combustion model. The implication on ash formation is also discussed.
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E304 CHAR MORPHOLOGY FROM THE AUTOMATED REFLECTOGRAM OF A COAL AND ITS IMPLICATIONS ON BURNOUT AND ASH FORMATION

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