Resistance to Flow of Gases through Lime Shaft Kiln for Calcining Smaller Particles of Limestone in Size. Part 2:Resistance to Flow of Gases through Calcining-and Cooling Zones. Fundamental Studies on Lime Shaft Kilns (4)

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In the previous paper, data on the coefficient of resistance to fluid flow through preheating zone in lime shaft kiln fired with solid fuels were presented by the authors.<BR>Following that work, this paper presents the results of a experimental investigation on the flow characteristics for the calcining and the cooling zones. Results were obtained under conditions of normal running of the test lime shaft kiln reported in the previous paper. In the calcining zone, the resistance to fluid flow is not independent of the permeability of the burden materials, the size distribution of solid, the rate of burning of fuel, the rate of calcining of limestone, and the distribution of temperature within the stack. Because of these many variables and the general uncertainty of the state of knowledge of the subject, a relationship between the measured pressure drop per unit of length and the apparent linear rate of air flow for combustion blown into the kiln stack was presented in a graphic form for the calcining zone. In the cooling zone, the flow characteristics showed no substantially different phase from that of the preheating zone on the coefficient of restance to fluid flow, but the data obtained could be represented by the just same empirical relation as obtained for the preheating zone.
無機マテリアル学会の論文