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Heat transfer in a 4 MWth circulating fluidized bed furnace operated under oxy-fired and air-fired conditions: modeling and measurements

Sadegh Seddighi (Institutionen för energi och miljö, Energiteknik) ; David Pallares (Institutionen för energi och miljö, Energiteknik) ; Fredrik Normann (Institutionen för energi och miljö, Energiteknik) ; Filip Johnsson (Institutionen för energi och miljö, Energiteknik) ; Ville Ylä-Outinen
International Journal of Greenhouse Gas Control (1750-5836). Vol. 37 (2015), p. 267-273.
[Artikel, refereegranskad vetenskaplig]

Heat transfer to wall panels in the furnace of a circulating fluidized bed (CFB) is investigated by means of a 1.5-dimensional mathematical model together with measurements from a 4-MWth CFB unit under air and oxy-fuel conditions. The conditions at the wall panels correspond to solids concentration between 0.35 and 18 kg/m3 and temperatures between 1054 and 1168 K. The heat transfer coefficient to the wall panels is similar in oxy-fuel and air-firing due to that the solids flow, which plays the main role in CFB furnace heat transfer, was kept similar in air and oxyfuel conditions. The modeled furnace heat extraction and in-furnace vertical profiles of temperature and solids concentration show generally good agreement with the corresponding measured values. Modeling results show that for all cases studied, the share of radiation in the total furnace heat extraction exceeds 70% and increases with the increase in furnace temperature. Modeling results also show that gas radiation has a small influence on furnace heat extraction.

Nyckelord: Oxy-fuel combustion, Heat transfer coefficient, Carbon capture and storage (CCS), Heat flux, Radiative



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Denna post skapades 2015-07-03. Senast ändrad 2015-07-29.
CPL Pubid: 219394

 

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Institutioner (Chalmers)

Institutionen för energi och miljö, Energiteknik

Ämnesområden

Energi
Hållbar utveckling
Kemiska processer

Chalmers infrastruktur