| 摘要 |
<p>The invention concerns a method for reducing the consumption of fresh water and energy in a paper mill. In the method fresh water is passed into the paper mill for various needs, and a cooling tower (100) is utilized, by whose means the water that has been heated in the papermaking process is cooled. All fresh waters or a substantial proportion of the fresh waters of the paper mill are introduced into the process through the water system of the cooling tower. Further, the invention concerns a cooling tower, in which there is/are an inlet/inlets (10) for passing the water (Win) to be cooled into the cooling tower (100), nozzles (13) or equivalent for dispersing the water that was passed in and that is to be cooled onto heat transfer faces, filler pieces and/or filler plates (15), which disperse the water to be cooled so as to increase the contact area between the water and the cooling air, an outlet/outlets (17) for passing the cooled water (Wout) out of the cooling tower (100), as well as blowers (23) for blowing the cooling air (Ain → Aout) through the cooling tower (100). The cooling tower (100) is composed of cooling modules (301...30N), each of which comprises the elements (10...23) mentioned above, and the number (N) and the height of said cooling modules (301...30N) have been chosen in accordance with the requirement of cooling capacity, and that said cooling modules (301...30N) have been interconnected mechanically in parallel and connected selectively and optimally in view of the flow (Ain → Aout) of the cooling air and of the flow (Win → Wout) of the water to be cooled.</p> |
