环境侧风与湿式冷却塔塔内通风量关系的实验研究  

Experimental Research of the Correlation Between Environmental Crosswind and Airflow Rate for Wet Cooling Towers

作　　者：高明[1] 赵元宾[1] 张磊[1] 孙奉仲[1] 

机构地区：[1]山东大学能源与动力工程学院,山东省济南市250061

出　　处：《中国电机工程学报》2012年第26期18-22,141,共5页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51106092);山东省自然科学基金项目(青年基金)(ZR2011EEQ018)~~

摘　　要：基于相似原理,通过热态模型实验,研究环境侧风下自然通风湿式冷却塔底部周向进风变化规律。研究表明:环境侧风破坏了冷却塔底部周向进风的轴对称分布规律,环境风速大于0.2 m/s时各处进风的不均匀性更加明显。与无风工况相比,当环境风速为0.4 m/s左右时,迎风面进风口风速为无风时的1.875倍,而背风面进风口风速仅为无风时的30%。同时分析了环境侧风下塔内漩涡分布规律,由进风口风速分布及塔内漩涡的分布规律可知,环境侧风严重影响了塔内通风量,恶化了塔内的传热传质性能。通过热态模型实验数据进行非线性回归,得到了塔内通风量(用空气重量风速表示)与环境侧风的关系,并通过140MW机组现场测试,验证了环境侧风与塔内通风量关系的准确性。Based on similarity theory, the change rules of circumferential inflow air on the bottom of wet cooling tower under crosswind conditions were researched by thermal state model experiment. Researches show that the axisymmetric distribution of circumferential inflow air is destroyed under crosswind conditions, and this phenomenon is more obvious when environmental crosswind velocity is more than 0.2m/s. Compared with windless conditions, when environmental crosswind velocity is about 0.4m/s, the circumferential inlet wind velocity in windward side is about 1.875 times of windless conditions, but the circumferential inlet wind velocity in leeward side is about 0.3 times of windless conditions. distribution rules of vortex inside tower was also analyzed, and the circumferential inflow air distribution and vortex distribution rules show that environmental crosswind affects the airflow rate inside cooling tower seriously, and deteriorates the heat and mass transfer performance. The correlation between environmental crosswind and airflow rate （that is air gravity wind velocity） is received based on nonlinear regression by using thermal state model experimental data. In addition, the accuracy of this correlation is verified by onsite test of commercial 140MW power plant.

关 键 词：环境侧风 湿式冷却塔 进塔风速 漩涡分布 通风量 

分 类 号：TK123[动力工程及工程热物理—工程热物理]