Method of cleaning exhaust gas of drying plants and an apparatus

Details Method of cleaning exhaust gas of drying plants and an apparatus Method of cleaning exhaust gas of drying plants and an apparatus

1989-08-15

1990-10-23

Spitzer, Robert

Gas separation

Means within gas stream for conducting concentrate to collector

55 9, 55 10, 55 11, 55 85, 55 89, 55 94, 55122, 55126, 55135, 55223, 55228, 55233, B01D 5314, B01D 5332

Patent

active

049648853

ABSTRACT:
The dew point of the exhaust gas is firstly reduced to a value in the range of 60.degree.-65.degree. C. Thereafter the exhaust gas flows through a washing and condensing apparatus. A part of the prepurified condensate is recirculated in a loop for carrying out the latter-mentioned 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 biological treatment plant, a repurification apparatus, a sand filter apparatus and finally through an ultrafiltration 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.

REFERENCES:
patent: 4750916 (1988-06-01), Svensson
patent: 4759777 (1988-07-01), Balakrishnan et al.
patent: 4781732 (1988-12-01), Wondrasch et al.

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