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Research Papers: Combustion of Waste/Fluidized Bed

A Method for Reduction in the Start-Up Time of a Bubbling Bed Boiler Combustor

[+] Author and Article Information
Vijay Jain

Department of Mechanical Engineering, Dalhousie University, P.O. Box 1000, Halifax, NS, B3J 2X4, Canada

Prabir Basu1

Department of Mechanical Engineering, Dalhousie University, P.O. Box 1000, Halifax, NS, B3J 2X4, Canadaprabir.basu@dal.ca

Dominic Groulx

Department of Mechanical Engineering, Dalhousie University, P.O. Box 1000, Halifax, NS, B3J 2X4, Canada

1

Corresponding author.

J. Energy Resour. Technol 132(3), 031401 (Aug 17, 2010) (7 pages) doi:10.1115/1.4002135 History: Received June 10, 2009; Revised March 23, 2010; Published August 17, 2010; Online August 17, 2010

A study on the heating of inert bed solids in a bubbling fluidized bed by means of an over-bed start-up oil burner is presented in this paper. Experiments carried out in a 160 mm diameter bed shows that the bed heats up nonlinearly with time. The rate of heating and the peak temperature reached by the bed solids depend on the bed depth, the mean particle size, and the superficial velocity through the bed. It was further noted that premixing a certain amount of biomass with the inert bed solids accelerates the rate of heating, as well as increase the peak temperature attained. The internal heat generation in the biomass is found to start at temperatures as low as 200°C. Thus, premixing some biomass with inert bed materials could reduce the combustion start-up time of a fluidized bed boiler, reducing at the same time the start-up cost by saving on consumption of expensive fuel oil in the burner. Experimental data in the present laboratory-scale unit shows good agreement with those obtained earlier in an industrial fluidized bed tested with waste-coal.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Bubbling fluidized bed experimental setup

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Figure 2

Location of thermocouples in the bed

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Figure 3

Temperature variations at lower superficial air velocity of 46 mm/s at 20°C

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Figure 4

Temperature variations across the bed at higher fluidizing velocity of 156 mm/s at 20°C

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Figure 5

(a) Comparison between the temperature histories of beds with different levels of premixed biomass. (b) Detail of the temperature histories for first 8 min.

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Figure 6

Thermal behavior of a biomass pellet heated in a furnace

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Figure 7

Comparison between an industrial and a bench scale BFB unit in the case when no biomass is premixed in the bed

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