板式蒸发式冷凝器热质传递过程模型分析  

Model Analysis on Heat and Mass Transfer Process in Plate-Type Evaporative Condenser

作　　者：魏高升[1] 陈林[1] 李兵[1] 陈永辉 杜小泽[1] 杨勇平[1] 

机构地区：[1]电站设备状态监测与控制教育部重点实验室(华北电力大学),北京市102206 [2]中电投东北电力有限公司,沈阳市110181

出　　处：《电力建设》2014年第6期18-21,共4页Electric Power Construction

基　　金：国家重点基础研究发展计划项目(973项目)(2009CB219804)

摘　　要：在分析板式蒸发式冷凝器工作原理的基础上,通过合理简化,提出了一种逆流热质传递过程的数学模型.采用方程求解器对模型进行了分析求解,得到了空气温度、空气湿度和水温沿流程分布的情况,以及空气温度、空气湿度、空气流量和水流量对板式蒸发式冷凝器换热特性的影响规律.研究结果表明：空气温度越高,蒸发式冷凝器的换热量越低,相对湿度越高,换热量越小;空气流速为1～3 m/s时,换热量增加幅度较大;在空气流速达到4m/s之后,换热量增加缓慢,趋于稳定;当水流量小于0.2 m/s时,换热量与水流量呈线性关系,水流量越大,换热量越大.Based on the analysis on the working principle of plate-type evaporative condenser, the mathematical model of counter-flow heat and mass transfer process was put forward through reasonable simplification, and solved by equation solver. The variation features of air temperature, air humidity and water temperature in the process were obtained. And then the influence characteristics of air temperature, air humidity, air flow rate and water flow rate on the heat transfer characteristics of plate-type evaporative condenser were analyzed. The results show that the heat transfer rate of evaporative condenser decreases with the rise of air temperature, or the rise of relative humidity. The heat transfer rate increases rapidly with the rise of air velocity when air velocity is in the range of 1-3 m/s, and increases slowly and tends to be stable when air velocity is larger than 4 rn/s. The heat transfer rate increases linearly with the rise of water flow rate when water flow rate is less than 0. 2 m/s.

关 键 词：蒸发冷却 凝汽器 板式 传热传质 

分 类 号：TM621[电气工程—电力系统及自动化]