| 摘要 |
The invention concerns a method for evaporation and possibly distillation of liquids by means of a heat pump. By using a heat pump (2), energy is taken from energy reservoirs (1) such as rivers, lakes, sea water, air, sun or ground heat. It is however difficult to obtain temperatures high enough to evaporate water at atmospheric conditions. According to the invention, low temperature heat is utilized by means of a heat pump by using the condenser (high pressure part) of the heat pump to evaporate liquids in an evaporator (4') at a pressure lower than the atmospheric pressure, and thus at a lower evaporation temperature. A pump or a compressor (10) after the evaporator (4') together with a pressure reducing device (9) at the inlet of the evaporator (41) ensures lower evaporation pressure. To fully utilize the heat energy from the heat pump, the liquids may be preheated in heat exchangers (5) before the pressure reducing means, or as part of the same means. To achieve higher temperature and pressure of the evaporated liquids, said liquids are further compressed by means of compressors (10), or alternatively by heating in intermediate heat exchangers (11) in order to achieve the desired temperature level. In the case of distillation, one stage will be required for each distillate. In addition to compressors (10), intermediate heat exchangers (11) and draining devices (12), pumps (13) are required to maintain desired recondensation pressure, possibly also valves (14) to insure correct dosing of residual products and distillates to collecting devices (15). |
