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CHEC Annual Day, 2009 Ash Deposition and Shedding in Biomass Suspension- Fired Boilers Muhammad S. Bashir PhD Student (01-09-2008 to 31-08-2011) Supervisors:

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Presentation on theme: "CHEC Annual Day, 2009 Ash Deposition and Shedding in Biomass Suspension- Fired Boilers Muhammad S. Bashir PhD Student (01-09-2008 to 31-08-2011) Supervisors:"— Presentation transcript:

1 CHEC Annual Day, 2009 Ash Deposition and Shedding in Biomass Suspension- Fired Boilers Muhammad S. Bashir PhD Student ( to ) Supervisors: Kim Dam-Johansen Peter A. Jensen Flemming Frandsen Stig Wedel

2 DTU Chemical Engineering, Technical University of Denmark CHEC Annual Day, 2009 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. Objectives Background Experiments Results and Discussion Conclusions Future Work Acknowledgment

3 DTU Chemical Engineering, Technical University of Denmark CHEC Annual Day, 2009 Ash Deposition during Biomass Combustion Objectives Background Experiments Results and Discussion Conclusions Future Work Acknowledgment L. Tobiasen et al; Fuel Processing Technology, 88 (2007) Biomass (straw)K, Cl, S

4 DTU Chemical Engineering, Technical University of Denmark CHEC Annual Day, 2009 Initial Experiments on Amagerværket Unit 2: Co-firing straw and wood Objectives Background Experiments Results and Discussion Conclusions Future Work Acknowledgment 80% Straw

5 DTU Chemical Engineering, Technical University of Denmark CHEC Annual Day, 2009 Deposit Probe Weight and Heat Uptake Objectives Background Experiments Results and Discussion Conclusions Future Work Acknowledgment

6 DTU Chemical Engineering, Technical University of Denmark CHEC Annual Day, 2009 Deposit Characterization for different straw shares Objectives Background Experiments Results and Discussion Conclusions Future Work Acknowledgment 80 % 100 % 35 % 65 %

7 DTU Chemical Engineering, Technical University of Denmark CHEC Annual Day, 2009 Ash Enrichment Objectives Background Experiments Results and Discussion Conclusions Future Work Acknowledgment

8 DTU Chemical Engineering, Technical University of Denmark CHEC Annual Day, 2009 Front Deposits Elemental Composition Objectives Background Experiments Results and Discussion Conclusions Future Work Acknowledgment

9 DTU Chemical Engineering, Technical University of Denmark CHEC Annual Day, 2009 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. Objectives Background Experiments Results and Discussion Conclusions Future Work Acknowledgment

10 DTU Chemical Engineering, Technical University of Denmark CHEC Annual Day, 2009 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 Amagerværket Unit 1 (co-fired with coal) using horizontal sootblowing probe. Ash deposition/shedding tests at Amagerværket Unit 1 (co-fired with coal) using vertical probe. Objectives Background Experiments Results and Discussion Conclusions Future Work Acknowledgment

11 DTU Chemical Engineering, Technical University of Denmark CHEC Annual Day, 2009 Acknowledgment Dr. Johan Wadenbäck/Søren Thaaning., Vattenfall A/S Energinet.dk for PSO project funding Objectives Background Experiments Results and Discussion Conclusions Future Work Acknowledgment Tak for opmærksomheden/ Thanks for the Attention !


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