Model of heat transfer in circulating fluidized beds applied for co2 capture by calcium-looping process

Abstract

The heat transfer to wall panels in the circulating fluidized beds applied for calcium looping process is investigated by the a mathematical model. The heat transfer between the furnace wall and the bed includes contributions from radiation, particle and gas convection, and gas conduction; these processes are highly coupled and interrelated. The energy and mass balance equations together with the equations that describe the hydrodynamics and heat transfer processes were implemented in MATLAB/Simulink. The model gives satisfactory predictions of the gas/particles to wall heat transfer coefficient for several sets of operating parameters. The simulation’s results show that more than 85% of the carbonation/calcination reaction has occurred in the dense region of the fluidized beds.