March 2017

Environment and Safety

Alternatives to flare gas recovery for sour refinery flare gas

For many sour gas streams present in a flare header, less expensive options than flare gas recovery may exist. The compressors, liquids management, downstream treating and other systems required for flare gas recovery (FGR) can be expensive to install and/or operate reliably. Some refineries allow the flaring of sweet gases.

For many sour gas streams present in a flare header, less expensive options than flare gas recovery may exist. The compressors, liquids management, downstream treating and other systems required for flare gas recovery (FGR) can be expensive to install and/or operate reliably. Some refineries allow the flaring of sweet gases. The presence of hydrogen sulfide (H2S) is often the primary reason why flare gas is not sweet fuel gas quality and cannot be flared. If the stream can be safely and economically treated to sweet fuel gas specifications without affecting flare system operation under upset/pressure-relief conditions, then treatment of the flare gas may be economically superior to flare gas

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