Friends,

I am in the process of designing a flare system for new plant, which is having some H2 relese with Hydrocarbon. The concentration of H2 in the HC stream varies with the stage of the process. How much hydrogen can be allowed in the flare tip, to avoid flash back and/or damage of the tip due to high calorific value.

Regards,

KamalP

I have some experiences in designing Flare system in refinery. Some of relieved gases contains high H2. I have not experienced problem with H2 from flare combustion perspective. One of the parameter influencing flare tip design is the LHV, as revealed in "Several Concerns in High CO2 Field Development", if you design for sonic tip, you may have to watch out for the minimum LHV value. Increased H2 level would assist combustion and reduce smoking level.

High H2 content would affect LEL and MW of the relieved gas. It might affect dispersion of relieved gas when you conduct the flame out study.

Kamal:

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