To promote the effective utilization
of different varieties of
low-calorific gas mixtures in a porous media burner, combustion behaviors
of three typical low-calorific gas mixtures in a two-layer porous
burner are simulated with a two-energy and one-dimensional transient
model. The equivalence ratio and inlet velocity are kept constant.
A baseline simulation for the three mixtures is presented, and partial
results are compared against the experimental measurement of axial
temperatures and emission levels. A parametric study is conducted
on the conductivity and convective coefficient of up- and downstream
sections. The study shows that the upstream convective coefficient
has more influence on temperature behaviors than that in the downstream.
The solid conductivity effect on temperature behaviors is closely
associated with the reaction zone location relative to the interface.
CO emission behavior is found to be fairly sensitive to the change
in upstream material properties. The results suggest that, for clean
combustion of low-calorific gases in a two-layer burner, thermal conductivity
of the upstream section should not be too large.
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