Cooling towers play a great role and are an essential equipment for many large factories, shopping malls, and thermal power plants. It exchanges the cooling water carrying waste heat with the air inside the tower, so that the waste heat is transferred to the air and dispersed into the atmosphere. This article takes everyone to understand the types, advantages and disadvantages of cooling towers.

Natural draft cooling tower: hot air with lower density flows out from the top of the cooling tower; cold air with higher density enters the cooling tower from the bottom of the tower to fill; no fan is required; concrete tower <200 m; used for cooling of large heat.

Mechanical ventilation cooling tower: The high-power fan forces the heat exchange between the air and the circulating water; the water film on the surface of the filler can exchange heat with the air as much as possible; there are many determinants of cooling efficiency; a variety of cooling capabilities are available; more cooling is possible The towers work at the same time, such as 8 towers combined control. The air is blown into the vent by the centrifugal fan; advantages: suitable for towers with large airflow resistance; the centrifugal fan has relatively low noise. The cooling water of the countercurrent cooling tower is sprayed on the filler and flows downward into the cooling water tank. Air is forced in from the bottom, and part of the cooling water is evaporated in contact with water in the filler, thereby reducing the water temperature.

Induced draft cooling tower: cross-flow induced draft cooling tower, counter-flow induced draft cooling tower. Advantages: The degree of reflux is lower than that of a forced draft cooling tower; the operating cost of the fan is less than that of a forced draft cooling tower. Disadvantages: The mechanical transmission of the fan and the motor requires a waterproof design. 1) Hot water enters the cooling tower from the top; 2) Air is forcedly induced by the fan and enters the cooling tower from the bottom; forced induction fan is used.

The cooling water enters from the top and flows through the packing layer; the air enters from one or both sides, and the fan is induced to make the air flow laterally through the packing layer. Due to the hot water natural flow water distribution system of this type of cooling tower, the advantage is low water pump head; lower initial investment of water pump; lower annual operating energy consumption and costs; large flow changes will not cause disadvantages to the water distribution system influences. The disadvantage is that the low pressure head will cause the nozzle to be easily blocked and the cooling water can not be well dispersed into a fine mist when sprayed; the direct exposure of the hot water tank to the air will cause the growth of algae; the area is large.

Because the pressurized water distribution spray device in this type of cooling tower has the advantage of increasing the height of the tower to obtain a longer heat exchange process and a smaller cooling width; because the pressurized spray device can spray smaller water droplets, Therefore, the heat exchange efficiency is higher. The disadvantage is that the pressure head of the system water pump increases; the energy demand increases and the operating cost increases; the cooling water nozzle is difficult to maintain and clean; the water distribution system and related pipelines are needed, so the initial investment increases.