Numerical Simulation On Coupling Of Wind Turbine And Direct Dry Cooling System

Wind power generation technology and direct dry cooling system is widely applied in coal-rich,water-deficient and windiness areas in north China. The thermo-flow performances of air-cooled condensers are conspicuously influenced by ambient wind.The flow velocity decreases when air moving through wind turbine. It is supposed that through coupling operation of two pieces of equipment,the air cooling performance is improved,the power consumption rate in power plant is decreased, and the energy is finally optimized.In this paper,the influence of the layout of the wind turbine on the thermo-flow performances of air-cooled condensers is studied by numerical simulation.First of all, according to the theory of the blade element, a geometrical profile wind turbine model is established. The availability of the model is verified by simulations,and the law of wake flow field on design wind speed is obtained. The coupled model of wind turbine and air cooling island was established. Fixed height of four different spacing layout is chosen to analyze the law of thermo-flow performances when there is wind from the left of air-cooling island.The causes of the "hot air recirculation" and "downdraught" is analyzed according to streamline and temperature chart. The results show that the near distance layout can improve the mass flow rate and heat fluxes in the air-cooling island. With the increase of wind speed, the improvement effect of the thermo-flow performances of upwind air-cooled condenser cell is more and more unobvious.At last,the actuator model is used to replace the geometrical profile wind turbine,The wind turbine is simplified to a plane that produces a pressure difference,which can reduce the calculation amount. Effect of two different height on the performance of air-cooling island is analyzed by numerical simulation when wind generating from the front and the left of air-cooling island at large wind speed.It indicate that higher layout can reduce the wind speed above platform of the air-cooling island,which can weaken suppression effect of wind on the outlet air of air-cooling island and "hot air recirculation". Lower layout can improve the heat fluxes of upwind air-cooled condenser cell,but the overall improvement effect is not as good as high layout.Two kinds of layout both have better performance when wind generating from the left of air-cooling island.The research results provide reference for the optimization of the thermo-flow performances of the air cooling island.