摘要
蒸汽喷射泵具有抽吸量稳定的特点,使其成为火力发电机组抽真空系统节能改造的一个重要技术方案,本文以某台同时安装了蒸汽喷射式抽真空系统和水环式真空泵的机组为例,详细测量和分析在各种实际运行工况(不同的机组负荷、凝汽器严密性、循环水进水温度)下,与水环式真空泵相比,蒸汽喷射式抽真空系统的节能收益以及对凝汽器换热系数的影响。试验结果表明:当凝汽器严密性非优秀时,与水环式真空泵组相比,蒸汽喷射式抽真空系统能产生一定的节能收益;该收益随凝汽器严密性变差、机组负荷率降低、循环水进水温度升高而增大。蒸汽喷射式抽真空系统改造方案并非适合所有机组,实施前应根据凝汽器抽真空系统实际运行状态核算投资回报周期。
We experimentally addressed the air extraction,from a large sized condenser of thermal power-plant with the pumping units comprising steam-jet and/or water-ring vacuum pumps,via case-study for the possible energy-saving solution.The influence of the pumping conditions,including,but not limited to the power-load,leakage-rate of condenser and temperature of circulating water,on the heat transfer coefficient and energy consumption,was investigated.The preliminary results show that the pumping conditions all have a major impact.To be specific,when it comes to energy-saving,the steam-jet pump significantly outperforms the water-ring pump,only under the specific pumping conditions,including a larger leakage-rate of condenser,a higher temperature of circulation-water and a lower power-load.We suggest that depending on the specific situation,steam-jet vacuum pump may not be a good energy-saving solution for all thermal power plants.
作者
朱宝
谢尉扬
方匡坤
顾伟飞
Zhu Bao;Xie Weiyang;Fang Kuangkun;Gu Weifei(Zhejiang Provincial Key Laboratory of Energy Conservation&Pollutant Control Technology for Thermal Power,Hangzhou 311121,China;Zhejiang Zheneng Electric Power Co.LTD,Hangzhou 310007,Chinq;Zhejiang Zheneng Taizhou Second Electric Power Generation Co.Ltd,Taizhou 317109,China)
出处
《真空科学与技术学报》
EI
CAS
CSCD
北大核心
2020年第9期808-812,共5页
Chinese Journal of Vacuum Science and Technology
关键词
凝汽器抽真空系统
节能改造
水环式真空泵
蒸汽喷射泵
Condenser air evacuation system
Energy saving renovation
Water ring vacuum pump
Steam jet vacuum pump
