Decarbonization›Flare Combustion Efficiency
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Flare Combustion Efficiency

Methane · Allen 2017 · 40 CFR 60.18

Flare Combustion Efficiency
Estimates flare CE and unburned methane emissions as a function of exit velocity, crosswind, gas heating value, and assist type (unassisted / air / steam). Flags 40 CFR 60.18 compliance (98% DRE, 200 BTU/scf min HHV, exit-velocity limits).

Flare Gas

Mscf/h
in
BTU/scf
%

Conditions

m/s
—

📚 Learn the Theory

Flare combustion efficiency: 40 CFR 60.18 destruction efficiency, Allen-Torres 2017 field measurements, and the wind/exit-velocity ratio impact on CE.

Read Engineering Guide →

Engineering Basis

  • 40 CFR 60.18: 98% destruction efficiency, ≥200 BTU/scf HHV, exit-velocity limits.
  • Allen et al. 2017 (J. Air Waste Manage. Assoc.): field-measured CE often well below 98% in real conditions.
  • CE = base × HHV_factor × wind_factor; sharp degradation when wind/v_exit > 3.
  • Assist type: unassisted typical 97% base, air 98.5%, steam 99% (vendor specs).
  • Standards: 40 CFR 60.18, API 521, EPA AP-42 §13.5, EPA Subpart W §98.236.

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