A STUDY OF THE BURNING VELOCITY OF LAMINAR COAL DUST FLAMES
Special Research Report SR-36 The ever -increasing importance of pulverized coal comb ustion points to the need for basic information on pulverized coal flames, in order to build a fund of knowledge that will enable coal technologists to meet competition from other fuels. The present work is a study of the burning velocities of coal dust sus pens ions. The work has been carried out on small flames on a tube burner, under conditions of laminar flow. Most of the measurements have involved one selected bituminous coal, plus blends of this coal with anthracite. Burning rates have been measured aver a wide range of coal dust concentrations, using supporting atmospheres slightly enriched in oxygen. The burning rate exhibits a maximum at a. compos it ion lying between stoichiometric for the total coal and stoichiometri c for the coal volatiles. An analysis of the dependence of burning rate on. the flame temperature shows that both radiative and conductive heat transfer are important in these small, laminar flames. Because conductive transfer is important, combustion of the volatiles, which gives rise to large conductive transfer in the flame front, is a significant factor in determining the burning rate. As a result , blending of bituminous coal with anthracite always decreases the burning rate. In. large flames , this should not occur because radiant transfer will dominate.
|A STUDY OF THE BURNING VELOCITY OF LAMINAR COAL DUST FLAMES
|Attribution-NonCommercial-NoDerivs 3.0 United States
|July 27, 2016
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