Abstract: In order to solve the problem of black smoke from release flare during oil and gas production on offshore platform, a three-stage ejector structure was used to optimize the structural of the basic flare burner, and the combustion and black smoke generation of the new flare were simulated by Fluent software. The results showed that when the expansion angle of the flare head was 7°, the clearance of the draft shield was 207 mm, the number of Venturi ejectors was 8, the depth of the main discharge pipe of the flare gas was 242 mm, the peak value of the soot mass fraction decreased from 2.2 mg/g to 1.5 mg/g, and no black smoke phenomenon was observed outside the flame surface. The new structure of flare burner has obvious effect on reducing soot. The research results can provide a reference for the technical improvement of the release flare on offshore platforms.

Key words: offshore platform, release flare, strong ejection, structural optimization, numerical simulation