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Research Papers

CFD Based Ash Deposition Prediction in a BFBC Firing Mixtures of Peat and Forest Residue

[+] Author and Article Information
Dan Lundmark1

 Oy Indmeas Ab, FIN-02150 ESPOO, Åbo Akademi Process Chemistry Centre, Biskopsgatan 8, FI-20500 Åbo, Finland

Christian Mueller2

 Oy Indmeas Ab, FIN-02150 ESPOO, Åbo Akademi Process Chemistry Centre, Biskopsgatan 8, FI-20500 Åbo, Finlandcmueller@cbw.de

Rainer Backman3

 Oy Indmeas Ab, FIN-02150 ESPOO, Åbo Akademi Process Chemistry Centre, Biskopsgatan 8, FI-20500 Åbo, Finland

Maria Zevenhoven, Bengt-Johan Skrifvars, Mikko Hupa

 Oy Indmeas Ab, FIN-02150 ESPOO, Åbo Akademi Process Chemistry Centre, Biskopsgatan 8, FI-20500 Åbo, Finland

1

Present address: Oy Indmeas Ab, FIN-02150 Espoo, Finland.

2

Present address: GmbH, D-46485 Wesel.

3

Present address: Umeå University, SE-901 87 Umeå.

J. Energy Resour. Technol 132(3), 031003 (Sep 29, 2010) (8 pages) doi:10.1115/1.4001798 History: Received October 08, 2004; Revised September 10, 2006; Published September 29, 2010; Online September 29, 2010

Combustion of biofuel mixtures for heat and power production is often combined with ash related operational problems. Their reliable prediction is therefore essential in order to improve boiler performance and availability. In this work, an ash behavior prediction tool based on computational fluid dynamics and advanced fuel analysis is used to predict the ash deposition tendencies in a 295MWth bubbling fluidized bed boiler fired with mixtures of peat and forest residue. The work focuses especially on two new modeling approaches for fuel distribution and bubbling bed. The overall combustion and deposition prediction results agree well with conditions in a real boiler.

Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Sketch of the Rauhalahti power plant: computational domain indicated by dashed line

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Figure 2

Selective leaching of fuel with water, ammonium acetate, and hydrochloric acid

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Figure 3

Computational mesh build from structured and unstructured meshing elements

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Figure 4

Flux scheme for freeboard and bubbling bed region including fuel-specific split of fuel to bed and freeboard: peat (P) and mixture peat—forest residue—(M)

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Figure 5

Outline of the bubbling bed area with marked inlet areas for primary gas (dark) and a mixture of air and recirculated flue gas (white)

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Figure 6

Composition of condensed phases (dark)

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Figure 7

Composition of condensed phases (dark) and determination of amount of melt of forest residue (white)

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Figure 8

Temperature distribution in horizontal planes at various vertical locations in the freeboard (K) in cases 1 and 2

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Figure 9

Temperature measurements at three locations in the superheater region (K)

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Figure 10

Carbon monoxide distribution in horizontal planes at various vertical locations in the freeboard (mole/mole)

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Figure 11

Ash particle hitting maps for the right wall in cases 1 and 2: color code indicating the temperature of particles hitting the wall

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Figure 12

Ash particle hitting maps for the front wall in cases 1 and 2: color code indicating the temperature of particles hitting the wall

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Figure 13

Ash particle hitting maps in case 1 compared with formed deposit on the right furnace wall: color code indicating the temperature of particles as in Fig. 9

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Figure 14

Temperature distribution in horizontal planes at various vertical locations in the freeboard (K) in cases 2 and 3

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Figure 15

Ash particle hitting maps for the left wall in cases 2 and 3: color code indicating the temperature of particles hitting the wall

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