| 摘要 |
Described are a method and device for cleaning waste water thermally, using a multiplicity of heat exchangers (1, 1,, 1", 1'") connected in cascade and supplied with the waste water. Each heat exchanger (1, 1', 1", 1'") includes an evaporator coil (4, 4', 4", 4'") and a superheater (3, 3', 3", 3'"), the evaporator coil (4) in the first heat exchanger (1) and all the superheaters being heated by an external heat source. The steam evaporated from the waste water in the first evaporator coil (4) is used to heat the evaporator coil (4') in the next heat exchanger (1'). Condensed heating medium is removed by draining it out of the evaporator coil. All the heat exchangers are thus operated from the heat supplied to the first heat exchanger. The condensation and blow-off losses which occur between neighbouring heat exchangers are compensated for by supplying a small quantity of additional heat. |
