Investigation of the Thermal Flow Field and Recirculation of a Direct Air-Cooled Condenser for a Large Power Plant

Abstract

The thermal effect experiments were carried out of a direct air-cooled system in the low speed wind tunnel. The influence of effect factors on recirculation is also discussion, after that the relationship between the thermal flows field structure and recirculation ratio under the cooling tower is analyzed. At last, the engineering measures to reduce or avoid recirculation are proposed. For certain conditions the experimental measurement shows close agreement with numerical values.

The Influence of Thermal Flow Field on Recirculation of Air-Cooled Tower for a Large Power Plant

“…Figure 4 gives the relationship between the average recirculation ratio and different schemes. Lengthen or Widthen schemes Average recirculation figure 4 we can find that adding the width of the platform and adding the length of the platform can both reduce average recirculation under the cooling tower [11]. Figure 5 gives the streamline picture of height of wind wall is 108.3mm, and width of front board is 50mm.…”

The Experimental Investigation of Recirculation of Air-Cooled System for a Large Power Plant

“…At the back of boiler house and backward position of wind wall, two eddies came into being. At the boundary of vortex, strong turbulent entrainment, and mixing up, which caused more and more plumes roll into the vortex [11].…”

“…Where w H the height of wind wall, N D the diameter of the fan, B is the adding width of the platform, and L is the adding length of the platform. From Figure 7 we can find that adding the width of the platform and adding the length of the platform can both reduce average recirculation under the cooling tower [11]. Figure 8 gives the streamline picture of height of wind wall is 108.3 mm, and width of front board is 50 mm.…”