| 摘要 |
A heat exchanger, evaporator made from the heat exchanger, and method of utilization thereof, take advantage of the thin yet strong and good heat exchange surface that is provided by a metal-plastic laminate. A laminate is typically either one plastic layer and a metal layer, or two plastic layers sandwiching a metal layer between them. The laminate normally has a thickness of less than about 200 mu m, for example the metal folio layer having a thickness of about 5-40 mu m and the plastic layer a thickness of about 12-25 mu m. Aluminum, cooper, and brass are good metals, while polyester and polyolefins are good plastics. Cellulose pulp mill plant liquid effluents may be passed in a falling film over the laminates to evaporate them, while steam is passed in the interior chamber between two laminates forming an evaporator. |
