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Gravel flame arrester is a safety device used to prevent hydrogen flame from spreading out. It is composed of a solid material (a fire element) that can be passed through a gas, with a number of tiny channels or gaps. Asked the fire element in the gap or channel as small as possible, so when the flame entered the flame arrester, fire retardant components are divided into many small fire flow, due to the heat transfer function (gas cooled) and the wall effect, the flame flow quenching.
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