Heat transfer in a 4 MWth circulating fluidized bed furnace operated under oxy-fired and air-fired conditions: modeling and measurements
Journal article, 2015

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.

Heat flux

Heat transfer coefficient

Oxy-fuel combustion

Carbon capture and storage (CCS)

Radiative

Author

Sadegh Seddighi

Chalmers, Energy and Environment, Energy Technology

David Pallarès

Chalmers, Energy and Environment, Energy Technology

Fredrik Normann

Chalmers, Energy and Environment, Energy Technology

Filip Johnsson

Chalmers, Energy and Environment, Energy Technology

Ville Ylä-Outinen

International Journal of Greenhouse Gas Control

1750-5836 (ISSN)

Vol. 37 267-273

Driving Forces

Sustainable development

Areas of Advance

Energy

Subject Categories

Chemical Process Engineering

DOI

10.1016/j.ijggc.2015.03.032

More information

Latest update

5/2/2018 6