Flare stacks burner diameter

A flare stack, particularly the flare burner, must be of a diameter suitable to maintain a stable flame and prevent a blowout should there be a major failure. 

Open flares have a flare tip with no restrietion to flow, the flare tip being the same diameter of the staek. Open flares are effeetively a burner in a tube. Combustion and mixing of air and gas take place above the flare with the flame being fully eombusted outside of the stack. 

The flare chamber is refractory lined and has an adjustable louvre at the bottom to regulate combustion air. Ignition is provided with a 0.20 MJ/h oil burner. A totally enclosed hood captures the combustion products and directs them to the 0.30 m diameter stack which extends above the hood. 

The flameholders actually are the most important feature of the flare. They are solid, 1-inch diameter rods of refractory material running horizontally above each burner line. The rod is positioned directly over the jet nozzles, with the bottom of the rod 1/2 inch above the tips of the nozzles. The rods provide a surface at which burning can take place. They prevent the flame from rising up to the top of the stack. The flameholders also promote better mixing of air and gas by the additional turbulence they cause above the jets. 

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