The R&D Of Waterpower Recycle Equipment And Inside Flow Numerical Simulation

Energy saving and multiple use of resource is a long-term strategic policy for the development of our country's economy and society. In order to save water, cooling tower (CT), which is used to cooling the hot water from manufacturing process and then make the water reusable, is widely applied in industries such as metallurgy, petroleum, chemical, salt making, power and fabric, but its energy consumption is too large at present. How to save energy and make the best of limited resource is most concerned in common among these users, so it is for these practical engineering need, CT's currently main problems and its'suitable reconstruction method were analyzed in this research. Taking one CT reconstruction project of one chemical factory as object, a simple and efficient waterpower recycle equipment, which converts the surplus energy head of circulating water into mechanical energy to drive the fans that was formerly driven by a electric motor, was researched and developed based on vane fluid machinery theory. If this device is adopted in CT's reconstruction project, not only the energy can be obviously saved, but also the user can obtain such benefit as saving water, cutting down the noise and the expenditure of repair and maintenance. Such a device designed in this paper suits for the CT with a capacity of 1500 ton per hour for a chemical factory in Si-Chuan province. During the process of R&D, there are two main concerns. First its efficiency for energy conversion should be enhanced. Besides, its structure should be as simple as possible, and its work liability and easy to manufacture should also be ensured in order to cut down cost. The hydraulic design for its main components was made in this paper according to CT's running requirements. Because the inducer's components can affect not only its structure and cost, but also its hydraulic efficiency, two schemes were proposed at the initial design for spiral casing; afterwards a 3-dimentional viscous numerical simulation of the complex turbulent flow field in the inducer components was carried out with CFD technique. A comparatively full analysis and performance was made to realize optimization quickly and effectively and shorten product's develop period and cut down cost. With the visual analysis of the flow field, it is shown that the hydraulic performance of circular spiral casing is superior to the one with rectangular one on many aspects. So circular spiral casing was adopted in the design. This equipment has been already installed at petroleum-chemical factory in Sichuan, and feedback shows that it works quite well and can save 600000 Yuan RBM per year. This method can be further used in the R&D process of other fluid machinery.