气象条件对华能东方电厂取水明渠水温的影响研究

明渠是火/核电厂直流或循环供水工程中的重要取水形式。由于开敞水面大,明渠水温对气象条件较为敏感,实践中需明确气象条件变化对明渠水温的影响程度和规律。本文依托于华能东方电厂取水明渠,利用原体观测和数值模拟相结合的方法,对气象条件引起的明渠沿程水温变化开展了研究。研究表明,自然气象条件下,白昼期间明渠水温存在一定的沿程升高,夜间存在微弱的沿程降低趋势;宽阔海域明渠的水温升幅大于内陆明渠,水温沿程温升不超过0.1℃;夏季不利气象条件下取水明渠水温沿程温升较明显;晴朗天气下白昼温升明显高于夜间。

Response of water temperature in intake channel of Dongfang Power Plant to meteorological conditions

Drawing water through open channels is a common way for once-through or recirculating cooling water systems of thermal power plants. Water temperature in open channels is usually rather sensitive to local meteorological conditions due to its large water surface open to the air. In design, attention should be paid to the variation range and trend in the meteorological impact on the water temperature. In this study, thermal dynamics of the water in different climate conditions have been examined by combining numerical simulations and prototype observations on the intake channel of the Dongfang power plant. Results show that in normal meteorological conditions, a weak temperature rising (less than 0.1 ?C) along the channel in the daytime and an even weaker decreasing trend in the nighttime were observed. In the wide seawater intake section of the channel, both the stream-wise rise and the temperature difference between its surface and bottom water layers were larger than that in the inland section. And adverse weather conditions in summer result in a higher stream-wise rise, and cloudless weather produces a stream-wise rise in the daytime significantly larger than that in the nighttime.