Effect of formulation of steady-state heat balance for char particles on AFBC modelling

Adánez, Juan; Abanades, J.C.; Gayán, Pilar

doi:10.1016/0016-2361(93)90134-n

Cited by 6 publications

(4 citation statements)

References 17 publications

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“…Although the bed was considered isothermal, the temperature of the char particle was higher than the bed temperature. The char surface temperature was calculated by simultaneously solving the heat balance for a particle that transfers heat to the medium by both convection and radiation, together with the reaction rate [28].…”

Section: Shmentioning

confidence: 99%

Circulating fluidised bed co-combustion of coal and biomass

Gayán

Adánez

Diego

et al. 2004

Fuel

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Circulating fluidised bed combustion (CFBC) is receiving wide research attention in view its potential as an economic and environmentally acceptable technology for burning low-grade coals, biomass and organic wastes, and thereby mixtures of them. Designs of the existing fluidised bed boilers for biomass combustion are mainly based on experience from coal combustion because the mechanism of combustion of biomass in fluidised beds is still not well understood. A good understanding of the combustion and pollutant formation processes and the modelling of the combustor can greatly avoid costly upsets of the plants. In this paper the performance of CFBC burning coal and biomass mixtures was analysed. Experimental results were obtained from the combustion of two kind of coals with a 2 forest residue (Pine bark) in two CFB pilot plants (0.1 and 0.3MW th). The effect of the main operating conditions on carbon combustion efficiency was analysed. Moreover, a mathematical model to predict the behaviour of the co-combustion of coal and biomass wastes in CFB boilers has been developed and validated. The developed model can predict the different gas concentrations along the riser (O 2 , CO, CH 4 , etc.), and the carbon combustion efficiency. The experimental results of carbon combustion efficiencies were compared with those predicted by the model and a good correlation was found for all the conditions used.

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Section: Shmentioning

confidence: 99%

Circulating fluidised bed co-combustion of coal and biomass

Gayán

Adánez

Diego

et al. 2004

Fuel

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“…The char surface temperature was calculated by simultaneously solving the heat balance for a particle that transfers heat to the medium by both convection and radiation, together with the reaction rate. 39 The kinetic constant for the combustion of pine wood chips was determined in a previous work. 40 Combustion of char is assumed to produce a mixture of CO and CO 2 products.…”

Section: Char Combustionmentioning

confidence: 99%

“…Although the bed was considered isothermal, the temperature of the char particles was higher than the bed temperature. The char surface temperature was calculated by simultaneously solving the heat balance for a particle that transfers heat to the medium by both convection and radiation, together with the reaction rate . The kinetic constant for the combustion of pine wood chips was determined in a previous work …”

Section: Mathematical Modelmentioning

confidence: 99%

Combustion of Wood Chips in a CFBC. Modeling and Validation

Adánez

Gayán

Diego

et al. 2003

Ind. Eng. Chem. Res.

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A mathematical model for the combustion of wood chips in a circulating fluidized bed (CFB) boiler has been developed. The model considers the processes of wood chip drying and devolatilization, population balances of devolatilizing particles, volatiles combustion, population balances of char burning particles, and heat generation in the different regions of the combustion chamber (bottom, splash, and transport regions) and can predict the gas emissions and combustion efficiency as a function of the operating variables. The validation of the model with experimental results obtained in a 12-MWth CFB commercial plant burning wood chips showed some differences between model predictions and experimental results for the oxygen profiles, the average char concentrations, and particle sizes along the riser. To achieve good predictions of biomass combustion in commercial boilers, the model was modified to include the biomass particle fragmentation during the devolatilization and combustion processes and the combustion in the cyclone. Moreover, a way to handle gas mixing problems has been highlighted and included in the model. With these modifications, better agreement between experimental results and model predictions was attained.

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Section: Shmentioning

confidence: 99%

04/02018 Circulating fluidised bed co-combustion of coal and biomass

2004

Fuel and Energy Abstracts

View full text Add to dashboard Cite

Circulating fluidised bed combustion (CFBC) is receiving wide research attention in view its potential as an economic and environmentally acceptable technology for burning low-grade coals, biomass and organic wastes, and thereby mixtures of them. Designs of the existing fluidised bed boilers for biomass combustion are mainly based on experience from coal combustion because the mechanism of combustion of biomass in fluidised beds is still not well understood. A good understanding of the combustion and pollutant formation processes and the modelling of the combustor can greatly avoid costly upsets of the plants.In this paper the performance of CFBC burning coal and biomass mixtures was analysed.Experimental results were obtained from the combustion of two kind of coals with a 2 forest residue (Pine bark) in two CFB pilot plants (0.1 and 0.3MW th ). The effect of the main operating conditions on carbon combustion efficiency was analysed. Moreover, a mathematical model to predict the behaviour of the co-combustion of coal and biomass wastes in CFB boilers has been developed and validated. The developed model can predict the different gas concentrations along the riser (O 2 , CO, CH 4 , etc.), and the carbon combustion efficiency. The experimental results of carbon combustion efficiencies were compared with those predicted by the model and a good correlation was found for all the conditions used.

show abstract

Effect of formulation of steady-state heat balance for char particles on AFBC modelling

Cited by 6 publications

References 17 publications

Circulating fluidised bed co-combustion of coal and biomass

Circulating fluidised bed co-combustion of coal and biomass

Combustion of Wood Chips in a CFBC. Modeling and Validation

04/02018 Circulating fluidised bed co-combustion of coal and biomass

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