| 摘要 |
1,227,676. Flash evaporators; disposal of waste liquors. VEREINIGTE KESSELWERKE A.G. 29 July, 1969 [26 Nov., 1968], No. 38087/69. Heading B1B. [Also in Division F4] Sewage sludge or industrial waste liquor is concentrated in flash evaporator vessels 5, 5', 5", and the concentrated liquor is atomized through one or more atomizers 12 into the flue gases of refuse incinerator 2 at such a rate and concentration as to reduce the temperature of the gases to 700‹-750‹C and bring about complete combustion of the atomized sludge. The flue gases are then further cooled to about 200‹C by flowing over heat exchanger 10 through which water is passed. The raw sludge is fed to centrifuge 1 to remove coarse solid constituents which are passed to incinerator 2. The clarified sludge is pumped via heat exchanger 3 to flash vessel 5, and the liquor is circulated by pump 6 through this vessel via heat exchanger 3' and valve 7. The flashed vapour flows through pipe 8 to heat exchanger 3, from which condensate is withdrawn. The partially concentrated liquor is further concentrated in flash vessels 5', 5" associated with heat exchangers 3" and 9, respectively. Heat-exchanger 3" is heated by flash vapour from vessel 5". Heat exchanger 9 is heated by steam produced in heat exchanger 10. If required, one or more of the flash stages can be bypassed.
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