Abstract
Emission characteristics of methanol combustion were studied by means of constant volume combustion in spherical vessels, the crevice volume of which was minimized as much as possible. CO, unburnt methanol (UBM), formaldehyde and NO x were important primary emission species from the environmental viewpoint. The yields of these emissions were measured as functions of equivalence ratio ∅. CO and NO x emissions corresponded to calculated equilibrium compositions at the adiabatic flame temperatures. On the other hand, UBM and formaldehyde were not predicted. UBM had a minimum value at ∅ ≈ 1.1. UBM and formaldehyde emissions were pressure-dependent, indicating that these emissions were related to quenching phenomena. By employing a larger vessel with a smaller surface/ volume ratio, these emissions could be reduced considerably. Methyl nitrite was produced as an important emission species via post-combustion reactions between UBM and NO x . Water addition was found not to affect the emission characteristics seriously.
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