Classification of cooling towers for water treatment agents
The tower structure used for cooling in the circulating cooling water system is called cooling tower for short. There are many kinds of cooling tower, according to the structure of the tower, there are frame type and FRP integral molding type; according to the power of air flow in the tower, there are natural ventilation and mechanical ventilation; according to the relative flow state of air and water in the tower, there are counter flow type and cross flow type; there are dry cooling tower, etc. The open natural draft cooling tower is at the top of the higher tower structure. The water is sprayed down by the water spraying device, and meets the air coming in from the shutter vertically to complete the heat exchange process. In fact, it is a enclosed water spraying cooling pool. The cooling effect depends on the ambient wind and temperature. It can only be applied to the system with small cooling water volume, low heat transfer requirement and low water temperature change. Air duct type cooling tower air duct type natural ventilation cooling tower has a very high air duct, so it has a strong air suction capacity. The air in low temperature state enters the cooling tower at the lower part of the air duct and effectively exchanges heat with hot water in the packing. The designed drenching density can be selected in the range of 4 ~ 7m3 / HR according to the needs. This kind of structure is often used in the system with large cooling water flow. Although the capital construction investment is large, the daily maintenance is simple and the energy consumption is small. Like the cooling water in power plant, the air duct cooling tower is generally used. Air blast cooling tower is a kind of cooling tower in which the air in the air temperature state is pressed into the tower by the blower installed at the bottom of the cooling tower, and the heat and mass transfer are carried out through the packing layer by countercurrent with hot water. The utility model has the advantages that the position of the fan is low, the maintenance is convenient, the operation of the fan is not affected by the hot and humid air, the temperature is low, and the service life is long, especially when the water quality is poor or there is corrosion, the corrosion of the fan can be avoided. The disadvantage is that when the cooling effect is the same, the tower height should be higher; the air in the tower is in a positive pressure state, which is not conducive to evaporation; when the suction of the fan is affected by the return of hot and humid air, the cooling effect is significantly reduced.