Water vapor recovery in the wet quenching process for coking towers
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The 5.5-meter-high ramming coke ovens still use the wet quenching process. Based on my own calculations, for example, one cavity of coke contains 30–32 tons of coke; to quench one load of such coke, about 40 tons of water need to be sprayed, of which 18 tons evaporate. Therefore, 1 ton of coke consumes 600 kilograms of water, and 1 truckload of coke consumes 18 tons of water. Spray water on the vehicle for 3 minutes after it has been extinguished; the smoke persists for 5 to 6 minutes ； 1 hour of coking quenching handles 4 to 5 cars, consuming approximately 75 t/h of water. Based on 8,000 hours per year, 600,000 tons of water are required annually. Given the high water consumption, are there any good methods or technologies to recover this amount of water vapor?
Due to strict environmental regulations regarding wet quenching, dry quenching is now required. Moreover, the various wastewater streams can be used for quenching after treatment, so little fresh water is needed. No wastewater from any coking plant is allowed to be discharged outside.