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Ash Deposition and Shedding in Biomass Suspension-Fired Boilers

Project Objectives. ?Optimal use of Biomass in large suspension-fired boilers."Ash deposition and removal behavior in the boiler chamber and superheater region (convective pass).Transient model based description of key processes responsible for ash deposition and shedding. Influence of load, o

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Ash Deposition and Shedding in Biomass Suspension-Fired Boilers

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    1. Ash Deposition and Shedding in Biomass Suspension-Fired Boilers Muhammad S. Bashir PhD Student (01-09-2008 to 31-08-2011) Supervisors: Kim Dam-Johansen Peter A. Jensen Flemming Frandsen Stig Wedel

    2. Project Objectives “Optimal use of Biomass in large suspension-fired boilers.” Ash deposition and removal behavior in the boiler chamber and superheater region (convective pass). Transient model based description of key processes responsible for ash deposition and shedding. Influence of load, operation conditions and fuel mixing on ash deposition and shedding.

    3. Ash Deposition during Biomass Combustion

    4. Initial Experiments on Amagervćrket Unit 2: Co-firing straw and wood

    5. Deposit Probe Weight and Heat Uptake

    6. Deposit Characterization for different straw shares

    7. Ash Enrichment

    8. Front Deposits Elemental Composition

    9. Conclusion Deposition rate increases for increase in straw share. Deposit layers differ in terms of color, thickness, hardness and composition for change in fuel composition. Deposits are more sintered in the upper layer for 100% straw-firing. Deposits and fly ash contains significant amounts of Ca and Si during suspension-firing.

    10. Future Work Final design of vertical probe for ash deposition/shedding in the furnace region. Modeling of ash deposition/shedding in the furnace region. Ash deposition/shedding tests at Amagervćrket Unit 1 (co-fired with coal) using horizontal sootblowing probe. Ash deposition/shedding tests at Amagervćrket Unit 1 (co-fired with coal) using vertical probe.

    11. Acknowledgment Dr. Johan Wadenbäck/Sřren Thaaning., Vattenfall A/S Energinet.dk for PSO project funding

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