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Sulfur Recovery Unit (SRU): SRU is widely used to recover sulfur-containing, poisonous acidic gas in the oil refinery process. The most commonly used process in sulfur recovery practice is the Claus Process, which is to burn the incoming gas with oxygen, refrigerate the burnt gas, and recovers sulfur from the burnt gas. SRU refinery unit converts sulfur gas such as H2S into elemental sulfur, so as to convert waste into treasure and protect the environment.