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Ejector convergence device as an energy-saving device , not only can take full advantage of the high row of steam energy to improve the thermal economy of units , but also opened up an energy-saving plant system , economic , environmental , and reliable way for steam rational use, to avoid the waste of high quality steam created favorable conditions . Therefore , the ejector the converging device will be widely used in the plant system . Ejector convergence devices and other the steam energy saving device compared to its relatively simple system , saving advantages of high quality steam and fast return on investment will be a lot of attention . In this paper, the combination of steam energy conservation issues at home and abroad has been the basis of the results of Datang Power Generation Co., Ltd. in Qitaihe 1,2 350MW unit auxiliary steam system objects, the load is less than 85 % of the rated load , variable conditions ejectors convergence device energy saving effect of a pilot study using computational methods , the thermodynamic calculation and variable conditions characteristic analysis of the energy-saving effect of the device , the calculation results showed that the device has a good energy saving effect and reduces generation standard coal consumption rate . On this basis , according to the devices exist some shortcomings , suggest improvements , establish a numerical simulation model of the turbulent flow using CFD methods , numerical simulation study of the device before and after improvement entrainment ratio , compression ratio , two indicators , analyzes compared before and after the device improved energy-saving effect , and the model is validated according to the actual operation data of the 350MW unit , this method can accurately simulate the running condition of the device . The results show that , relative to the original equipment , the device improved energy-saving effect is a slight upgrade , can provide the basis for the optimal design of the device . ?
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