介绍华能国际电力股份有限公司上安电厂600 M W机组凝结水系统概况，针对除氧器上水调门局部阻力较大，造成节流损失的问题，提出在50％～100％负荷时，保持除氧器上水调门及其旁路电动门全开的方法，并从经济性、安全性两方面分析该方...介绍华能国际电力股份有限公司上安电厂600 M W机组凝结水系统概况，针对除氧器上水调门局部阻力较大，造成节流损失的问题，提出在50％～100％负荷时，保持除氧器上水调门及其旁路电动门全开的方法，并从经济性、安全性两方面分析该方法的经济效益和节能效果，认为该方法节能效果显著。展开更多
A MHD generator with different arrangements of electromagnetic fields will lead the generator working in three modes.A quasi-one-dimensional approximation is used for the model of the MHD generator to analyze the inne...A MHD generator with different arrangements of electromagnetic fields will lead the generator working in three modes.A quasi-one-dimensional approximation is used for the model of the MHD generator to analyze the inner mechanism of operation modes.For the MHD generator with a uniform constant magnetic field,a specific critical electric field E_(cr) is required to decelerate a supersonic entrance flow into a subsonic exit flow.Otherwise,the generator works in a steady mode with a larger electric field than E_(cr) in which a steady supersonic flow is provided at the exit,or the generator works in a choked mode with a smaller electric field than E_(cr) in which the supersonic entrance flow is choked in the channel.The detailed flow field characteristics in different operation modes are discussed,demonstrating the relationship of operation modes with electromagnetic fields.展开更多
基金supported in part by the National Natural Science Foundation of China under Grant 51006027,Grant 50925625,and Grant 51437002the Natural Scientific Research Innovation Foundation in Harbin Institute of Technology under Grant HIT.NSRIF.2009091the Specialized Research Fund for the Doctoral Program of Higher Education of China under Grant 20102302120047
文摘A MHD generator with different arrangements of electromagnetic fields will lead the generator working in three modes.A quasi-one-dimensional approximation is used for the model of the MHD generator to analyze the inner mechanism of operation modes.For the MHD generator with a uniform constant magnetic field,a specific critical electric field E_(cr) is required to decelerate a supersonic entrance flow into a subsonic exit flow.Otherwise,the generator works in a steady mode with a larger electric field than E_(cr) in which a steady supersonic flow is provided at the exit,or the generator works in a choked mode with a smaller electric field than E_(cr) in which the supersonic entrance flow is choked in the channel.The detailed flow field characteristics in different operation modes are discussed,demonstrating the relationship of operation modes with electromagnetic fields.
