Destruction (removal) efficiency (DE or DRE)

It is a percentage conversion of the hydrocarbon components entering the flare combuston zone to other compounds – CO2, CO, soot. It is calculated from the concentrations of individual flare plume components. It is always higher than combustion efficiency (except when CE is 100% – then DE is also 100%) as the latter measures complete combustion (to CO2), while destruction efficiency measures incomplete hydrocarbon combustion (to CO2, CO, soot).

Elevated Flare definitions and calculation methods from 40 CFR 63 Subpart CC section 63.641

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