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| TRANSPORT PROCESSES IN DILUTE-PHASE FLUIDIZATION AS APPLIED TO CHEMICAL METALLURGY Ⅱ. APPLICATION OF DILUTE-PHASE TECHNIQUE TO HEAT TRANSFER |
| MOOSON KWAUK; DIEN-WEI TAI(Institute of Chemical Metallurgy; Academia Sinica) |
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Cite this article:
MOOSON KWAUK; DIEN-WEI TAI(Institute of Chemical Metallurgy; Academia Sinica). TRANSPORT PROCESSES IN DILUTE-PHASE FLUIDIZATION AS APPLIED TO CHEMICAL METALLURGY Ⅱ. APPLICATION OF DILUTE-PHASE TECHNIQUE TO HEAT TRANSFER. Acta Metall Sin, 1964, 7(4): 391-408.
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Abstract On the basis of the analysis of the previous paper, the present work poses a series of problems in dilute-phase heat transfer technique as applied to chemical metallurgy, and illustrates its practical aspects through pilot-scale measurements and experiments in the development of new metallurgical processes.In actual practice, particles are more often than not in accelerative motion while heat is being transported between them and the surrounding fluid medium, with the result that the transfer coefficient seldom retains a constant value. An acceleration integral∫F(x)=integral from n=Re_0 to (Re_0+Re)((Re_s~xdRe_s)/(Ar_(Δρ)-fRe_s~2)) is proposed from which four dimensionless groups are derived (Eqs. (28), (29), (31), and (36)) which permit comparison of analogous heat transfer equipment on a generalized basis. Towards this end, Eq. (43) is derived for calculating the effectiveness of heat recovery for multi-layer dense-phase fluidization with full allowance for heterogeneous nonuniformity, so that the dense-phase operation may be compared directly with the corresponding dilute-phase operation as given by Eqs. (26) and (26a).After heat transfer measurements had been conducted on pilot scale, the authors applied the dilute-phase technique to heat transfer problems in the magnetizing roasting of low-grade iron ores and the sulfatizing roasting of an iron ore containing small amounts of copper and cobalt. In both cases pilot plant results indicate that the capital investment of dilute-phase equipment would be much lower that those of the conventional counterparts of corresponding capacities. Finally, it is concluded that dilute-phase technique is a new, yet rapidly developing field in the application of fluidization to chemical metallurgy, and a few important problems are proposed for future investigation.
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Received: 18 April 1964
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