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Romanian lignite presents utilization problems since it is one of the lowest grade coals in the world. In order to improve the performance of pulverized lignite combustors and to reduce the environmental impact there is interest in predicting NO x emission characteristics and carbon burnout. The application of CFD modeling for this purpose has been widely used for pulverized bituminous coal...
This paper investigates the 'average' coal molecular structure of Pittsburgh #8, and how that structure changes during pyrolysis to form char. Chars were prepared at different stages of pyrolysis in a heated wire mesh reactor, and analysed by FTIR spectroscopy of the C-H stretching regions. This yielded information on the aromaticities and the concentrations of aromatic and aliphatic hydrogen and...
During the oxidation of porous coal chars the internal surface area can increase as a function of the degree of conversion due to pore growth and the opening up of sealed internal pores or cavities. Consequently, rate expressions for their oxidation are more accurately described in terms of the intrinsic reactivity, where differences in surface area and porosity can be taken into account.The oxidative...
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