Method of cleaning exhaust gas of drying plants and an...

B - Operations – Transporting – 01 – D

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183/126, 165/47,

B01D 53/00 (2006.01) B01D 5/00 (2006.01) B01D 53/84 (2006.01) C02F 1/24 (2006.01) C02F 9/00 (2006.01) C02F 1/04 (2006.01) C02F 1/44 (2006.01) C02F 3/00 (2006.01)

Patent

CA 1322519

ABSTRACT OF THE DISCLOSURE The dew point of the exhaust gas is firstly reduced to a value in the range of 60 - 65° C. There- after the exhaust gas flows through a washing and con- densing apparatus. A part of the prepurified conden- sate is recirculated in a loop for carrying out said washing. Thereafter the gas flows through a wet-deep bed filter apparatus. The sprinkler apparatus belonging thereto is fed again by a partly purified liquid. A drying chamber follows the wet-deep bed filter apparatus. The gas is then finally purified in an electro-filter plant. The condensate in the washing and condensing apparatus, to which also the washing liquid stemming from the sprinkler apparatus of the wet-deep-filter apparatus is added, is fed to a flotation plant. This condensate-liquid mixture has an increased temperature such that a better working in the flotation plant is obtained. The liquid flows thereafter through a bio- logical treatment plant, a repurification apparatus, a sand filter apparatus and finally through an ultra- filtration apparatus. Between the individual liquid treatment apparatuses and plants, respectively, a part of the liquid is branched off and is fed in a closed loop fashion back to other apparatuses or plants in order to carry out purifying or cleaning, respectively, functions thereat. This allows an extremely economical operation of the entire apparatus.

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