Tail gas from a Claus sulfur recovery plant containing H2S and SO2 is completely oxidized thermally or catalytically to SO2. The hot SO2 gas is then cooled by a DynaWave® Wet Scrubber and gas cooling tower, and submicron acid mist is removed by the Brink® Mist Eliminator.
After passing through the proprietary SO2 physical absorbent specified by the ClausMasterTM SO2 Recovery design team, clean gas exits the stack and the SO2 is stripped from the SO2 laden absorbent in the stripping tower. Concentrated SO2 is recycled back to the Claus sulfur recovery plant where it is converted to sulfur.
The recycled SO2 reduces the air and fuel requirements for a typical Claus plant and H2S tail gas system.