自然通风湿式冷却塔雨区阻力与变工况特性研究  

Investigation on rain zone resistance and variable condition characteristics of natural draft wet cooling tower

作　　者：余兴刚 宾谊沅 李旭 陈文 谢诞梅[3] YU Xinggang;BIN Yiyuan;LI Xu;CHEN Wen;XIE Danmei(Hunan Province Key Laboratory of Efficient&Clean Thermal Power Generation Technologies(State Grid Hunan Electric Power Corporation Limited Research Institute),Changsha 410007,China;Hunan Xiangdian Test&Research Institute Co.,Ltd.,Changsha 410004,China;School of Power and Mechanical Engineering,Wuhan University,Wuhan 430072,China)

机构地区：[1]高效清洁火力发电技术湖南省重点实验室(国网湖南省电力有限公司电力科学研究院),湖南长沙410007 [2]湖南省湘电试验研究院有限公司,湖南长沙410004 [3]武汉大学动力与机械学院,湖北武汉430072

出　　处：《热力发电》2021年第9期112-118,共7页Thermal Power Generation

基　　金：国家自然科学基金项目(51776142);湖南省科技创新平台与人才计划(2016TP1027)。

摘　　要：以某10000 m2自然通风湿式冷却塔为对象,计算了不同淋水密度和填料层风速下的雨区阻力系数,得到了适用范围更广的雨区阻力系数计算公式;基于麦克尔焓差法构建了冷却塔一维热力计算模型,模型计算得到的出塔水温与实测值的最大相对偏差仅为1.6%;运用所建立的一维热力计算模型开展了该冷却塔变工况特性研究。结果表明:出塔水温将随着循环水流量的增大而升高,当循环水流量变化量相同时,出塔水温的变化量将随着热负荷的增大、干球温度的降低、相对湿度的降低而升高;热负荷对出塔水温的影响受循环水流量、干球温度的影响较大,而受相对湿度的影响相对较小;出塔水温和冷却幅高随干球温度和相对湿度的增大分别呈升高和减小的变化趋势,而大气压力的影响基本可忽略。By taking a natural draft wet cooling tower(CT)with drenching area of 10000 m2 as the research object,calculation of rain zone resistance coefficient under conditions with different drenching densities and packing section velocities was conducted.The formula to calculate rain zone resistance coefficient which is more applicable than existing formula was obtained.A one-dimensional(1D)thermal calculating model for CT was established based on Merkel enthalpy difference method.The maximum relative deviation of the CT outlet temperature between the computed values and the measured values is only 1.6%.Moreover,the above established 1D thermal calculation model was applied to analyze the characteristics of the CT under variable condition.The results indicate that,the CT outlet water temperature rises with the circulating water flow.However,the variation of the CT outlet water temperature corresponding to the same variation of circulating water flow increases with the increase of heat load,decrease of dry bulb temperature and relative humidity.The influence of circulating water flow and dry bulb temperature on effect of heat load on CT outlet water temperature is larger than that of relative humidity.The CT outlet water temperature rises and the cooling approach decreases with increase of ambient dry bulb temperature and relative humidity,while the effect of atmospheric pressure can be neglected.

关 键 词：自然通风湿式冷却塔 雨区阻力系数 一维热力计算模型 变工况特性 出塔水温 

分 类 号：TK121[动力工程及工程热物理—工程热物理]