Dry and Wet Combined Cooling Tower Manufacturers

There are two modes of dry and wet cooling towers: dry and cold operation and wet and cold operation. When the ambient temperature is ≤ the designed stop spraying temperature, the spray water can be turned off, and the cooling needs can be met entirely by convection heat exchange with the air. Dry-cooling operation does not consume water, so white fog is avoided. Dry-cooling operation can save a lot of water and water treatment costs every year. Widely used: thermal power generation, nuclear power generation, petrochemical, fine chemical, steel metallurgy, non-ferrous metal metallurgy and other fields.

The dry and wet combined cooling tower the advantages of dry cooling and wet cooling, and its working principle is as follows:

Dry cooling principle: Hot water enters the cooling tube bundle of the dry cooling part. Usually, the cooling tube bundle uses high-efficiency heat transfer elements such as finned tubes to increase the heat transfer area. Under the action of the fan, external air flows through the outer surface of the cooling tube bundle. Since the hot water temperature in the pipe is higher than the air temperature outside the pipe, there is a temperature difference between the two. Heat is transferred from the hot water to the air through the pipe wall in a sensible heat exchange manner, which reduces the hot water temperature and increases the air temperature. The heated air is discharged from the tower by the fan, thereby achieving initial cooling of the hot water.

The principle of wet cooling: The hot water after dry cooling enters the wet cooling part. Hot water is sprayed evenly on the water-dripping filler through the water distribution system to form a water film. The air entering from the lower part of the cooling tower is in full contact with the water film on the filler during upward flow. On the one hand, air directly contacts heat transfer with water, reducing the temperature of the water; on the other hand, part of the water evaporates into water vapor and enters the air, absorbing the latent heat of vaporization during the evaporation process, further reducing the temperature of the water. The cooled water is collected into the collecting pool and recycled. At the same time, in order to reduce the loss of water droplets and the impact on the environment brought out by the air flow, a water collector and a mist demister are usually provided on the upper part of the wet cooling section. The water collector is used to collect water droplets, and the mist demister is used to remove water mist in the air flow.

Advantages of dry and wet cooling tower:

Significant water saving: zero evaporation loss during dry segment operation, saving 30% to 70% water than pure wet tower;

Flexible adaptation: Switch wet mode in high temperature and high humidity environments to ensure cooling efficiency;

Environmental compliance: reduce drift and white mist (steam plume), suitable for strictly environmentally friendly areas;

Low maintenance cost: Dry section reduces scale and corrosion and extends equipment life.