Abstract
A novel laminar-flow flameless reactor has been designed and constructed for investigating the combustion behaviour of individual coal particles, incorporating a three-colour optical pyrometer for measuring single-particle temperatures. Results for the combustion of Beulah (North Dakota) lignite char at sizes below 200 μm and at gas temperatures between 760 and 1270 K are presented. It was found that the particle temperature in all cases studied exceeded the local gas temperature by several hundred degrees. The burning rates were controlled by the mass diffusion of oxygen, and the mean particle temperature was linearly dependent on oxygen mole fraction in the gas phase over the range 0.05 to 0.16. The particle temperature also showed an inverse relationship with particle size.
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