Abstract
A 1 MWth pilot-scale chemical looping combustion (CLC) system is numerically simulated in the Eulerian-Lagrangian framework. Multiple chemical reactions including coal pyrolysis, char gasification, volatiles combustion, and oxidation of oxygen carriers are considered in the model. The influence of solid fuel feeding rate on the performance of the CLC system is analyzed and the parcel-scale information is obtained. The numerical results are synthetically compared with the experimental measurements. A non-uniform distribution of the gas species is observed in two reactors. Meanwhile, the relatively uniform parabolic profiles of solid holdup are displayed at different radial directions while the profiles of CO2 concentration at different radial directions are quite asymmetrical and non-uniform. Due to the strong oxidation reaction, the temperature profile in the AR is higher than that in the FR. The lognormal probability plots of solid residence time present an early peak with a long tail. Increasing coal feeding rate will promote the formation of product gas yields and solid temperature but suppresses the transport of solid particles in the CLC system.
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