Removal of sulfur dioxide from gas streams
Abstract
Abstract SULFUR DIOXIDE IS REMOVED FROM A GAS STREAM SUCH AS THE WASTE GAS GENERATED BY FUEL COMBUSTION, BY SCRUBBING THE GAS STREAM WITH A CIRCULATING AQUEOUS SOLUTION CONTAINING DISSOLVED SODIUM SULFITE, SO THAT A PORTION OF THE SODIUM SULFITE IS CONVERTED TO SODIUM BISULFITE. A BLEED STREAM IS WITHDRAWN FROM THE CIRULATING SOLUTION AND REACTED WITH CALCIUM CARBONATE TO PRODUCE PRECIPITATED SOLID CALCIUM SULFITE, WHICH IS FILTERED OFF. AT LEAST A PORTION OF THE SOLUTION IS THEN REACTED WITH CALCIUM OXIDE TO PRECIPITATE SOLID CALCIUM SULFATE AND THEREBY PREVENT A BUILDUP OF SULFATE IN THE SYSTEM. THE SULFATE IS ORGINALLY FORMED DUE TO IN SITU OXIDATION OF SULFITE. THE CALCIUM SULFATE IS FILTERED FROM THE REMAINING SOLUTION, WHICH IS RETURNED TO THE GAS SCRUBBING OPERATION.
Inventors
- 👤 I Shah
Bibliographic Details
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