Research PaperOperation of air cooled condensers for optimised back pressure at ambient wind

The traditional back pressure regulation of turbine is influenced more seriously by ambient wind and temperature, especially the hot air reflow and high temperature effect on the axial fans of the air-cooled condensers. This variation would result in the cooling capacity of the fans decreasing and the power consumption increasing. The grey difference incremental correlation method is proposed for considering the back pressure regulation problem from a single condenser cell perspective, and analyze the influence on the heat rejection when processing the speed regulation of the axial fans, then the relationship between the heat rejection increment and the influence of the back pressure will be obtained. The flow and temperature fields of the air-cooled condensers can be obtained by applying the CFD method, and the different back pressure in the different fan speed will be calculated. The results show that, larger the fans ventilation rates will not necessarily cause higher the heat rejection of the finned tube bundle. Reasonably improve the speed of the higher relational degree fans can effectively reduce the turbine back pressure and save energy.