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Coal Characterization in Relation to Coal Combustion

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Fundamentals of the Physical-Chemistry of Pulverized Coal Combustion

Part of the book series: NATO ASI Series ((NSSE,volume 137))

Abstract

Most coals are used worldwide for combustion today. Generally all kinds of coals are applicable for combustion. The major methods of burning are fixed bed firing, fluidized bed firing and suspension firing. The last technique is used in big industrial plants for electric power generation. In fixed bed firing heating rate is slow (a few K/s), and combustion time ranges from minutes to hours, depending on particle size. In fluidized bed combustion heating rates can be estimated at 103 to 104 K/s, burning temperatures are between 800 and 900° C, and burning times are in the order of minutes. In suspension firing heating rates also are high, temperatures are more than 1500° C, and burning times are in the order of seconds. In these firing systems characteristic and very different particle sizes are used: Lump coal in a range from 5 to 50 mm in fixed bed firing, crushed coal in a size range from 1 to 5 mm in fluidized bed firing, and pulverized coal with sizes of below 100 μ in suspension firing.

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Authors
  1. Harald Jüntgen
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  1. Centre de Recherchers sur la Physico-Chimie des Surfaces Solides - C.N.R.S., 24, Avenue du Président Kennedy, 68200, Mulhouse, France

    J. Lahaye  & G. Prado  & 

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Jüntgen, H. (1987). Coal Characterization in Relation to Coal Combustion. In: Lahaye, J., Prado, G. (eds) Fundamentals of the Physical-Chemistry of Pulverized Coal Combustion. NATO ASI Series, vol 137. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3661-4_1

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  • DOI: https://doi.org/10.1007/978-94-009-3661-4_1

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