New equations calculate Claus unit sulfur-recovery efficiency

Michael Anderson Brimstone Engineering Services Inc. Chino Hills, Calif. A method has been developed that allows direct, accurate calculation of recovery efficiency for Claus sulfur-recovery units (SRU). The calculation combines feed-gas data and tail-gas composition to calculate flow rates for combustion air and tail-gas streams. Because the recovery calculation quantifies tail-gas flow and composition, it allows direct, exact calculation of conversion efficiency, recovery efficiency, and plant sulfur emissions. The recovery-efficiency algorithm or calculation has been designed to accommodate a wide variety of plant configurations without need for modification....

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