| 摘要: |
| 为探求大型自然通风冷却塔热力性能及优化方向，本文对某1 000 MW燃煤机组配用的淋水面积为12 000 m2的大型自然通风冷却塔热力性能进行实验研究，利用气水比和冷却数拟合该塔的热力性能方程式并得到测试塔冷却数的修正系数，给出该塔内实测风温的分布，用不同阻力系数公式计算出塔水温。结果表明：填料等高布置的模拟冷却塔与填料不等高布置的工业塔的修正系数为1.047～1.081；填料不等高布置的工业塔塔内风温均方根误差为0.56～0.67 ℃，其值小于填料等高布置的相应冷却塔，故填料的不等高布置能强化冷却塔的冷却性能；进塔水量大时，可采用阻力经验系数公式快速计算出塔水温，为大型自然通风冷却塔的设计与改造提供参考。 |
| 关键词: 热力性能 现场测试 自然通风冷却塔 风温分布 出塔水温 |
| DOI： |
| Received:February 08, 2018Revised:May 17, 2018 |
| 基金项目: |
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| Study on Thermal Performance of Large Natural Draft Cooling Tower |
|
Wu Jian1, Xie Yue1, Hu Sanji2
|
| (1.School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology;2.Xi'an Thermal Power Research Institute Co., Ltd.) |
| Abstract: |
| To explore the thermal performance and optimization direction of a large natural draft cooling tower, the thermal performance of a large natural draft cooling tower with a watering area of 12 000 m2 was tested for a 1 000 MW coal-fired unit. The gas-water ratio and cooling number were used to fit the results, and thermal performance equation and correction coefficient of the cooling test tower were obtained. The distribution of the measured wind temperature in the tower was given. The water temperature of the tower was calculated using different resistance coefficient formulas. The results showed that the correction coefficient of industrial towers with equal heights of packing and those with unequal packings was 1.047–1.081. The root mean square error of the air temperature in the industrial towers with unequal heights of packings was 0.56–0.67 ℃, which was less than the corresponding cooling tower with equal heights of packing. Thus, the cooling performance of the cooling tower could be enhanced by the unequal arrangement of the packing. The water temperature of the tower could be quickly calculated by using the empirical formula of resistance under the condition that the amount of water entering the tower was large, which provides a reference for the design and modification of large natural draft cooling towers. |
| Key words: thermal performance field test natural draft cooling tower air temperature distribution outlet water temperature |
