Author(s): Luo Huiyuan
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Keywords: No Keywords
Abstract: Thermal power plants with low heat efficiency consume a large amount of heat energy. In the total heat from fuel more than 50% is absorbed in cooling water and released into recieving water body, causing thermal pollution. It has become an increasingly attentive problem how to utilize such a huge portion of the " waste" heat energy. Since its comple-tion in 1957, the Beijing Yongding River Water Diversion Canal has experienced ice haz-ards several times, and water conveyance was severely affected, the maintenance cost for protecting canal banks from damage caused by freezing and thawing was quite large. In or- der to solve ice freezing problems in the canal, deicing by diverting warmwater from a thermal power plant into the upstream section of the canal was started in 1985, and good result has been obtained. Analyzing field data about hydraulics and thermodynamics along the canal, we found that such a low temperature residual heat of large quantity, storing in water body, can raise water temperature along the canal through flow diffusion, and prevent the canal from ice freezing in winter, and also an optimum approach to turn wastes into benefits. Meanwhile, a one-dimensional heat diffusion model derived from theoretical analysis is verified by field data and the agreement is satisfied. Therefore, a prediction on water temperature along the canal and the scope of deicing could be made.
Year: 1993