The hot air from the first bed of the converter and the SO₃ secondary cooler is used for silica gel regeneration; the excess hot air generates steam and hot water for heat tracing of raw materials and finished products. A portion of the remaining hot air (100 °C) is further sent to Unit 38 to treat the wastewater from the scrubber. By oxidizing the Na₂SO₃ and Na₂SO₄ in the wastewater and evaporating the water, crystalline Na₂SO₄ hydrate is produced. The plant can therefore achieve zero wastewater discharge from the scrubber.
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