The Energy-saving Analysis of Steam Ejector in plant Steam System

This paper introduces the development trend of steam ejector and the impact of plant steam source´s operating mode on the economical efficiency of units. On the basis of the working principle of steam ejector, high-pressure steam is used as a media to inhale and compress the low-pressure steam by the steam ejector, which turns the low-pressure steam into the medium-pressure steam for recycling. In addition, combining with the computer programming, this paper elaborates the design method of steam ejector through the practical calculation, from which we can obtain the ejector coefficient of steam ejector under the best conditions and the structure size with the optimum parameters through optimized calculation. For the important role of plant steam system in thermal power plant, the steam ejector is applied to the plant steam system, and we can calculate the relative decrease value of cycle thermal efficiency of units, which is caused by plant steam with steam ejector. Compared with the relative decrease value of cycle thermal efficiency of units caused by traditional plant steam, we can draw the conclusion eventually: the use of steam ejector improves the thermal economical efficiency of units, and it has a good effect on energy-saving.