The cooling tower is a hyperbolic natural ventilation tower of reinforced concrete structure, which was put into use in 1999, with a height of 85, a radius of 56 meters at the bottom of the tower and a radius of 33 meters at the top of the tower.
1. Characteristics of hyperbolic cooling towers.
Cooling towers are high-rise structures used in power plants and other industries to circulate cooling water, which relies on the evaporation of water to transfer heat to air to cool the water. The environmental characteristics of the cooling tower of the power plant are that the carbon dioxide content in the environment is high, the chance of acid rain is greater, the surface of the inner wall is washed by water all year round, and the temperature difference between inside and outside is very large in winter.
2. Analysis of common diseases and causes of power plant cooling towers.
The main hazard forms on the concrete structure of the cooling tower are steel rust and concrete cracking, its life depends on the environment in which it is located and the ability to resist the erosion of various harsh environments, the expansion of the corroded steel bar causes the protective layer of concrete to loosen and fall off, the inner wall waterproof protective coating is damaged, and the waterproof function is lost, and the durability of reinforced concrete has a great relationship with the compactness of concrete The non-dense concrete creates conditions for the instrusion and corrosion of the medium, and the surface of the column at the bottom of the cooling tower is affected by water and wind for a long time.
3. Construction of hyperbolic cooling tower.
The anti-corrosion layer on the inner wall of the cooling tower began to fall off in a large area again, and the freeze-thaw phenomenon appeared in the throat of the tower, the tower column and the water tank had different degrees of corrosion, and the tower body and tower pillar appeared locally with holes, pulverization, spalling and other phenomena, resulting in the exposure of steel bars, which seriously affected the safe operation of the cooling tower. The initial anti-corrosion and anti-seepage layer on the inner surface of the cooling tower is made of partial ethylene copolymer emulsion waterproof coating, and the second layer of anti-corrosion and impermeable layer is made of epoxy coal asphalt on the basis of the original cloth and two oils. The outer surface of the cooling tower is only coated with cement slurry for protection, due to the large temperature difference between the inside and outside of the tower in the northern alpine winter, the cooling tower gradually freeze-thaw phenomenon, the anti-corrosion layer falls off, the inner wall of the cooling tower is treated with anti-corrosion treatment methods for the base treatment, epoxy putty repair, painting special paint primer, special coating glass cloth two layers, brushing special paint three times.