| 摘要 |
A method of regenerating a scrubbing solution containing sodium sulfite, sodium bisulfite, sodium sulfate and sometimes sodium hydroxide circulated in scrubbers to remove sulfur oxides from gas streams where sodium sulfite is converted to sodium bisulfite as sulfur dioxide is absorbed in the scrubbing solution. A portion of the circulating scrubbing solution is bled off for regeneration and reacted with calcium oxide in pebble lime while the pebble lime is impinged against an impingement surface at a velocity of at least 8-10 feet per second to convert the sodium bisulfite back to sodium sulfite and form calcium sulfite precipitate. The calcium sulfite is removed from the regenerated scrubbing solution and the regenerated scrubbing solution returned to the circulating scrubbing solution in the scrubbers.
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