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Abstract
This study numerically investigates a two-dimensional physical model of methane/air mixture combustion in catalytic and non-catalytic porous media. The temperature distribution and flame stability of combustion in inert alumina (Al2O3) pellets and platinum (Pt) catalyst-supported alumina (Al2O3) pellets, were studied by changing the burner structure, operating parameters, and physical properties of alumina pellets. The simulation results indicated that the gas temperature in the inert porous medium is higher than that in a catalytic porous medium, while the solid temperature in an inert porous medium is lower than that in a catalytic porous medium. The flame moved toward the burner exit with the increasing diameter of the packed pellets at a lower equivalence ratio and moved toward upstream with the increased thermal conductivity of packed pellets. The flame location of the catalytic porous burner was more sensitive to the flame velocity and insensitive to thermal conductivity compared to the inert porous burner. The distance of the flame location to the burner inlet is almost constant with the increasing length of the porous media for both the catalytic and inert porous burner, while the relative position of the flame location moved toward the upstream.
Highlights
Low calorific value gases mainly include blast furnace gas, coke oven gas, coal seam gas, landfill gas, biogas, and other combustible gases (Wood and Harris, 2008; Mujeebu et al, 2009), which are regarded as “exhaust gas” and directly discharge to the environment
The flame position of the catalytic porous burner was more sensitive to the flame velocity compared to the inert porous burner. This is because the combustion reaction occurred in the pore and on the surface of the solid skeleton for the catalytic porous burner; whereas the combustion reaction only occurred in the pore of the inert porous and all the heat was released by gas phase reactions for the inert porous burner
The flame temperature distribution was almost identical at lower equivalence ratio (φ = 0.20), whereas the flame location of catalytic porous burner was much closer to the burner inlet at the equivalence ratio (φ = 0.30)
Summary
Low calorific value gases mainly include blast furnace gas, coke oven gas, coal seam gas, landfill gas, biogas, and other combustible gases (Wood and Harris, 2008; Mujeebu et al, 2009), which are regarded as “exhaust gas” and directly discharge to the environment. The low calorific value gases are usually burned by preheating the mixture of air/fuel with an auxiliary device as assistant equipment. Porous media combustion is a promising method for handling low calorific value gases, which can recuperate heat from the combustion zone to the fresh mixture of fuel/air by solid conduction and radiation. It has been the subject of much attention in the past few decades due to its characteristics of higher power density, flame speeds, efficiency, and its lower pollutant emissions, compared with free flame combustion.
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