Study on Bed Temperature Distribution and Heat Transfer Performance of Rotary Drum Ash Coolers

Journal of Chinese Society of Power Engineering ›› 2015, Vol. 35 ›› Issue (7) : 568-573.

Auxiliary Equipment Technology

SUN Lijun¹, LIU Baiqian^1,2, TAN Peilai¹, YAO Jiabin¹

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Abstract

To better interpret the hot ash heat transfer process in rotary drum, the cooling process of hot ash in a water-cooled rotary drum (RD) drained from circulating fluidized bed boiler was investigated at different rotation speeds and ash filling rates, after which optimum ash filling rates were obtained. Results show that there exist a high temperature region in the ash bed, which nearly coincides with the core region of granular flow; along the circumferential direction of ash motion in the passive layer, the ash temperature is approximately uniform on the same particle path line, and the ash bed can be divided into thermostatic strips according to the radial distance of RD wall; the heat transfer rate increases with the rise of ash filling rate, but the increasing gradient is gradually reduced; with the rise of drum rotating speed, the optimum ash filling rate increases first and reduces later on, and at the rotating speed of 5 rpm, the optimum ash filling rate reaches the maximum, i.e. 28.7%.

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rotary drum ash cooler / heat transfer / temperature distribution / circulating fluidized bed

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SUN Lijun, LIU Baiqian, TAN Peilai, YAO Jiabin. Study on Bed Temperature Distribution and Heat Transfer Performance of Rotary Drum Ash Coolers. Journal of Chinese Society of Power Engineering. 2015, 35(7): 568-573

References

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Received	Published
2014-09-12	2015-07-25
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2015-07-25

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