某项目冷却水泵汽蚀余量分析及探讨  

Analysis and discussion of net positive suction head of cooling water pump in a project

作　　者：黄生云 李晅 张恒春 Huang Shengyun;Li Xuan;Zhang Hengchun(China Academy of Building Research,Beijing;The 718th Research Institute of CSSC,Handan)

机构地区：[1]中国建筑科学研究院有限公司,北京 [2]中国船舶集团有限公司第七一八研究所,邯郸

出　　处：《暖通空调》2023年第7期116-119,共4页Heating Ventilating & Air Conditioning

摘　　要：对某项目不同方案的冷却水泵的汽蚀余量进行了分析和探讨,指出在当地大气压和输送液体温度已定的情况下,汽蚀余量的影响因素为冷却水泵入口与冷却塔底盘液面的高差和两者之间的管路阻力。提出了采用压出式冷却水泵安装方式,以及把冷却塔布置在裙房或塔楼屋顶,利用建筑本身的高度有效克服管路阻力、避免汽蚀现象的措施。建议水管控制流速不大于3 m/s,单个弯头局部阻力(水头)小于等于0.5 m。This paper analyses and discusses the net positive suction head(NPSH)of different schemes of the cooling water pump of a project,and points out that the influencing factors of NPSH are the height difference between the inlet of the cooling water pump and the liquid level of the cooling tower bottom tray and the pipeline resistance between them when the local atmospheric pressure and the temperature of the transmitted liquid have been determined.This paper proposes the installation method of press-out cooling water pump,and the arrangement of cooling towers on the podium or the tower roof to effectively overcome the pipeline resistance and avoid cavitation by using the height of the building itself.It is recommended that the flow rate of the water pipe is not be greater than 3 m/s,and the local resistance(water head)of a single elbow is less than or equal to 0.5 m.

关 键 词：汽蚀余量 冷却水泵 压出式安装 局部阻力 方案优化 流速控制 

分 类 号：TU83[建筑科学—供热、供燃气、通风及空调工程]