冷却塔全年运行适宜条件分析

以横流湿式冷却塔为分析对象,基于冷却塔热湿交换原理,结合其热湿传递四变量模型以及所构建的冷却塔热湿交换性能评价指标,以冷却塔额定工况的热湿交换能力为比较基准,重点分析了季节和室外气象参数(温度、湿度等)变化,对冷却塔热湿交换性能的影响规律;在此基础上,进一步分析了南京、武汉、重庆三地区全年运行的适宜条件.研究结果表明:基于冷却塔变水量条件,三地区夏季负荷高峰期(7,8月份)冷却塔运行适宜的水气比为μ=0.5~1,夏季负荷平谷期(6,9月份)适宜的水气比为μ=0.3~1;过渡季节,重庆地区不适宜运行,南京和武汉地区适宜运行的月份为3月和11月,水气比为μ=0.4~0.6;冬季(1,2和12月份),三地区适宜的水气比为μ=0.5~0.76.

Analysis of the Annual Suitable Operation Condition of Cooling Towers

This paper investigated the cross-flow wet cooling tower, constructed the evaluating indicator on the basis of the heat and mass transfer performance, and then used classical four-variables model to study the effect of different seasons and ambient parameters (temperature, humidity and so on) on the heat and mass transfer of the cooling tower, and finally, gave the suitable operation condition of annual round operation in Nanjing, Wuhan and Chongqing. The results show that the suitable water-air ratio condition of CT is 0.5~1 in July and August of the three cities, and in June and September, 0.3~1. During transition season, the suitable water-air ratio condition of CT is 0.4~0.6, and the suitable operation time is March and November for Nanjing and Wuhan, but CT in Chongqing is not suitable for operation during the transitional seasons. In winter (from December to February), the suitable water-air ratio condition of CT is 0.5~0.76.