Abstract
Pore-scale studies of premixed gas combustion in a packed bed is conducted to study the flow and thermal non-equilibrium phenomenon in packed bed. The 3D random packed bed is generated using the EDEM software and solid surface radiation is computed using Discrete Ordinates (DO) model. The simulations are carried out using a commercial software package based on the finite volume method. It is shown that the local variation of species mass fraction, reaction rate et al. in pores near the flame front is significant, the radiation heat flux is transferred layer-by-layer. Cold flow simulation without reaction reveals that flow non-equilibrium is one of the essential characteristics of packing bed and increase in flow velocity leads to intensify non-equilibrium phenomenon. The distributions for content of axial velocity and gas temperature are wave-like shape in the burner and vary with time.
Highlights
Random packed bed has been widely used in industrial production, such as solar energy utilization, porous burner/reactor design and electronics cooling, packed bed burner was one of the most important aspects [1]
The aim of this work is to present pore-scale study of gas flow and heat recirculation in random packed bed, the bed is generated by EDEM software and CH4 /air combustion is treated with single step irreversible reaction, solid surface radiation is computed using the Discrete Ordinates (DO) model, the flow, combustion and heat recirculation in packed bed are analyzed
The solid surfaces radiation is taken into content of non-equilibrium in packed bed.the
Summary
Random packed bed has been widely used in industrial production, such as solar energy utilization, porous burner/reactor design and electronics cooling, packed bed burner was one of the most important aspects [1]. The thermal conductivity of solid is significantly higher than that of gas, the solid phase plays important role in the heat redistribution process by multi-mode heat transfer methods, including convection heat transfer, heat conduction inside pellets and thermal radiation between pellet surfaces. The thermal conduction of solid skeleton and thermal radiation have been proved to be effective way to recirculate heat from hot products to fresh mixture in the upstream side. In this way, the lean flammability limit can be extended to realize the gas combustion with very low calorific value [3]
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