The hot air generated from the first layer of the converter and SO3 second cooler can be used for silica gel regeneration, extra hot air produces steam and hot water for raw material and finish product heat tracing. Then partial remaining hot air (100℃) further goes to Unit 38 to treat the wastewater coming from the scrubber. Crystal Na2SO4 hydrate will be produced by oxidizing the NaSO3 and Na2SO4, and evaporating water in the wastewater. Therefore, the plant can realize ZERO wastewater discharge from scrubber.
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