Double-layer indirect cooling tower

Abstract

The invention discloses a double-layer indirect cooling tower which comprises an inner-layer tower barrel and an outer-layer tower barrel which are coaxial, and are arranged in an inner and outer nesting manner, wherein the bottoms of the inner-layer tower barrel and the outer-layer tower barrel are flush; the bottoms of the inner-layer tower barrel and the outer-layer tower barrel are respectively fixed in the same machine rack; the outer-layer tower barrel is a hyperbolic-type cooling tower; the inner-layer tower barrel is a cylindrical-type cooling tower; the inner-layer tower barrel is higher than the outer-layer tower barrel; an outer-layer inclined heat radiator at an angle with the ground is arranged at the inner edge of the bottom of the outer-layer tower barrel; an inner-layer inclined heat radiator at an angle with the ground is arranged at the outer edge of the bottom of the inner layer tower barrel; a separation wall is arranged between the inner-layer tower barrel and the outer-layer tower barrel; the bottom of the separation wall is arranged on the upper surface of the machine rack; and the top of the separation wall is at equal height as the outer layer tower barrel. The double-layer indirect cooling tower has the advantages that the double-layer indirect cooling tower has flexible antifreezing measures; on the premise that the outer-layer tower barrel is the same, the heat radiating area is increased significantly, and the heat transmission effect is improved; or on the premise that the heat radiating area is not changed, the floor area can be reduced significantly; and the influence on the indirect cooling tower in a crosswind environment can be eliminated significantly.

Description

technical field [0001] The invention relates to the field of energy and power engineering, in particular to a double-layer indirect cooling tower used in large thermal power plants. Background technique [0002] On September 12, 2014, the National Development and Reform Commission issued a notice on the "Coal Power Energy Conservation and Emission Reduction Upgrading and Transformation Action Plan (2014-2020)", which clearly stipulates the power supply that must be achieved by various coal power units in 2020. Coal consumption indicators, coal power units are under great pressure to save energy. [0003] The indirect cooling tower (hereinafter referred to as the indirect cooling tower) is located at the cold end of the thermodynamic cycle of the air-cooling unit, and its working performance directly affects the vacuum of the condenser and the coal consumption of power supply. The data shows that every time the water temperature at the outlet of the cooling tower decreases b...

AI Technical Summary

Problems solved by technology

These two reasons lead to unsatisfactory natural ventilation effect

[0010] The flow field and temperature field inside the tower are not uniform, which reduces the air temperature difference and density difference inside and outside the tower, further reduces the ventilation volume, and affects the heat transfer effect

[0011] 2. The short and fat cooling tower only arranges radiators around the bottom of the tower, which does not make full use of the inner area of ​​the tower, and the heat exchange area arranged is too small

When the ambient wind speed is high, drafts will be formed, which will affect the heat transfer effect

Images