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| SOME PROBLEMS OF THE HEAT FLOW THROUGH THE BLAST FURNACE HEARTH WITH CARBON LINING |
| WAN SHU-MING Institute of Chemical Metallurgy; Academia Sinica |
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Cite this article:
WAN SHU-MING Institute of Chemical Metallurgy; Academia Sinica. SOME PROBLEMS OF THE HEAT FLOW THROUGH THE BLAST FURNACE HEARTH WITH CARBON LINING. Acta Metall Sin, 1959, 4(3): 206-216.
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Abstract The effect of the thermal conductivities, proportion and distribution of some refractory liningmaterials in the hearth, cooling and salamander on the temperature distribution and heat loss hasbeen reviewed critically. The temperatures of the bottom with all ceramic lining can be decreasedby substituting carbon lining from its periphery, and the carbon lining displays a "transitional"cooling effect. It is justly the advantage of the high thermal conductivity of the carbon lining.Furthermore this effect has a certain effective limit. It is pointed out that the more the tem-perature of the bottom to be decreased, the lower the thermal conductivity of the most innerlining material and the higher the thermal conductivity of the more outer lining layer. This isa very important principle in this problem. By this principle, we can see that the transitionalcooling effect of the carbon lining can appear only when it is not used as the most inner lining.By the same reason, it is obvious that the layer with higher thermal conductivity, like graphitelayer, under the bottom behaves as a underhearth cooling. It is suggested that the new approach to decrease the heat loss is using the material as themost inner lining with its thermal conductivity as small as possible. A new cooling method,called cascade cooling, was described; it is using several lining layers under the bottom, of whichthe inner one has higher thermal conductivity than the outer one. It is pointed out that in theexisting thermal model for the hearth the salamander formed actually was not taken into account,thus it is very inadequate to describe the actual state of the hearth. This is a great defect of theexisting thermal model experiment. Its improvement was described. It is proposed that the de-pendence of the heat flow on the inner and outer diameter of the hearth and the thickness ofits various linings should be studied; that the effect of the thermal conductivity of lining on theheat flow and the graphitizing of the carbon lining ought to investigate further.
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Received: 18 March 1959
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