Formation of Internal Circulation in a  Fluidized-Bed Boiler and Control of Overall Heat Transfer Coefficient.

Oshita, Takahiro; Higo, Tsutomu; Kosugi, Shigeru; Inumaru, Naoki

doi:10.1252/kakoronbunshu.19.956

Cited by 2 publications

(3 citation statements)

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“…The results were extensively used in the design and operation of Bubbling Fluidized Bed (BFB) boilers. However, the studies on ICFB were relatively limited except for a few investigations by Ebara Company, Japan, (Ohshita et al, 1994), which developed ICFB with partition boards. Because of effect of the flowing zone, the heat transfer rate in the heat exchange zone without partition boards ( Fig.1) is different from Ebara's approach, which utilized partition boards.…”

Section: Experimental Study Of the Heat-transfer Coefficientmentioning

confidence: 99%

Heat-Transfer Study of External Superheater of CFB Incinerator

Sheng

Wei

Li³

et al. 2004

Environmental Engineering Science

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The heat transfer coefficients for horizontally immersed tubes have been studied in model internally circulating fluidized bed (ICFB) and pilot ICFB incinerators. The characteristics in the ICFB were found to be significantly different from those in a bubbling bed. In ICFB, there is a flowing zone with high velocity, a heat exchange zone, and a moving zone with low velocity. The controllable heat transfer coefficients in ICFB strongly depend on the fluidized velocity in the flowing zone, and also the flow condition in the moving zone. The heat exchange process and suitable bed temperature can be well controlled according to this feature. Based on the results of experiments, a formulation for heat transfer coefficient has been developed. These results were applied to an external superheater of a CFB incinerator with a 450 °C steam outlet in a waste-to-energy pilot cogeneration plant of 12 MW in Jiaxing City, China.

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Section: Experimental Study Of the Heat-transfer Coefficientmentioning

confidence: 99%

Heat-Transfer Study of External Superheater of CFB Incinerator

Sheng

Wei

Li³

et al. 2004

Environmental Engineering Science

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show abstract

“…On the other hand, the artificially uneven distribution of fluidized air can also result in a local internal circulating flow [3,4], which might improve the lateral dispersion. The fluidized velocity changes in the fuel heating zone can affect the volatile release rate, the combustion rate, and the heat transfer rate between the high-temperature bed materials and fuel particles [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…The circulation was controlled by producing an imbalance in the air supplies to different zones of the distributor, tilting the distributor (so that the flow is up the slope), or the use of a spout as a pump. The three methods mentioned above have been employed as the main ways to induce an internal circulating flow in fluidized beds [3][4][5][6][7][10][11][12][13][14][15][16]. Thus, this fluidized bed is called an ICFB.…”

Section: Introductionmentioning

confidence: 99%