噴射器結構優(yōu)化及其在電廠中的應用研究
[Abstract]:Based on the application characteristics of the ejector, the structure of the adjustable ejector is optimized. By using the theory of jet and swirl mixing, the nozzle outlet of the ejector is equipped with a jet blade or swirl blade. The jet coefficient is greatly increased with the smaller energy loss of the jet core. Aiming at these two kinds of structural optimization ideas, based on a model of adjustable ejector, numerical study was carried out on different height, installation number and installation angle of flaps and swirl blades. The temperature, pressure, velocity and jet volume ratio are obtained, and the flow field inside the ejector is analyzed qualitatively. The basic influence of the structure and installation of swirl blade on the ejection characteristics of adjustable ejector has been achieved, and the purpose of improving jet performance greatly with smaller core energy loss of jet has been achieved. In addition, from the results of numerical calculation, the jet structure of the jet can obviously enhance the mixing performance of low pressure fluid, improve the mixing effect, and make the downstream velocity, pressure and temperature distribution more uniform. At the same time, this paper studies the auxiliary steam system of a thermal power plant, analyzes the rationality of the selection of steam source parameters of different steam users in the system, and proposes to improve it by means of ejector (ejector). An example is given. The results show that the ejection confluence device not only reduces the throttling loss of valve regulation, but also benefits the pressure regulation of steam users, and with the enhancement of ejection capacity, the energy saving effect of the system is greatly improved. On the whole, compared with the traditional adjustable ejector, the mixing performance and ejection ability of the ejector are improved greatly, and the effect of the swirl ejector is better than that of the ejector. The application of ejector in auxiliary steam system of power plant has obvious energy saving effect, convenient access and safety, and has wide application prospect. Based on the existing adjustable injector, a useful attempt has been made to optimize its structure through the numerical calculation in this paper, and some preliminary conclusions have been drawn about the inrush nozzle and swirl nozzle. The optimization design and further study of the ejector have certain reference significance.
【學位授予單位】:華北電力大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:TM621
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