February 2011

Special Report: Clean Fuels

Minimize carbon footprint from Claus tail-gas units

Reevaluate emissions efficiencies on sulfur-removal operations

Heisel, M., Linde AG; Rameshni, M., Worley Parsons

There are thousands of sulfur recovery units (SRUs) worldwide converting poisonous hydrogen sulfide (H2S) into elemental sulfur (S). A typical two-stage Claus plant achieves 95%–97% recovery. In most cases, secondary tail-gas treating is required for total recoveries from 98% to 99.98%. In the past, authorities required a sulfur recovery rate (SRR) to meet local legislation. Other emissions, notably carbon dioxide (CO2), were of no concern. In view of the global climate change debate and continuously rising energy prices, limiting CO2 emission is becoming important. Various Claus tail-gas treatment options are available, but, differ in terms of carbon footprint, sulfur recovery efficie

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