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金属学报  1964, Vol. 7 Issue (4): 391-408    
  论文 本期目录 | 过刊浏览 |
流态化冶金中的稀相传递过程 第二部分 稀相技术在换热中的应用
郭慕孙;戴殿卫
中国科学院化工冶金研究所;中国科学院化工冶金研究所
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)
全文: PDF(1137 KB)  
摘要: 在前文的分析基础上,提出了将稀相技术应用于流态化冶金中換热过程时的一系列問題,并通过稀相換热的扩大实驗和中間工厂实践进一步闡明稀相流态化的应用。 在工艺換热过程中顆粒在加速度状态下与周围的流体进行換热,因此換热系数并非为常数。本文通过一个加速度积分 ∫F(x)=integral from n=Re_0 to (Re_0+Re)((Re_s~xdRe_s)/(Ar_(Δρ)-fRe_s~2)),对換热設备的換热能力和压降特性用四个无因次数加以統一描述[式(28),(29),(31)和式(36)]。将稀相換热与多层浓相流态化床比較时,本文为流速的非齐次性提出式(43)所表示的多层流态化床的热量回收率关系,使之可与稀相換热[式(26)和式(26a)进行直接比較]。 在进行稀相換热扩大实驗后,将稀相技术应用于貧铁矿的磁化焙烧和含低品位銅鈷氧化鉄矿的硫酸化焙烧中間工厂中,并指出采用稀相換热的設备投资仅为习俗設备的一个很小的百分数。 指出稀相技术是一个流态化冶金中正在开始发展的領域,其中許多問題尚待进一步的探索和研究。
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.
收稿日期: 1964-04-18      出版日期: 1964-04-18

引用本文:

郭慕孙;戴殿卫. 流态化冶金中的稀相传递过程 第二部分 稀相技术在换热中的应用[J]. 金属学报, 1964, 7(4): 391-408.
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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