(1) Once-through cooling water station
In the once-through cooling water station, the cooling water is discharged after being used only once by the heat exchange equipment, so the once-through water is also called primary use water. The once-through cooling water station usually consumes a lot of water, the temperature rise of the water after passing through the heat exchange equipment is very small, and the temperature of the discharged water is also low, and the content of various minerals and ions in the water remain basically unchanged. This kind of cooling water station has low investment, simple operation, low water quality requirements, but large water intake, high operating costs, and does not meet the requirements of water saving and energy saving. Even in areas with abundant water resources, the use of once-through water cooling stations is not recommended. The original once-through cooling water stations in many factories have gradually been transformed into circulating cooling water stations.
(2) Circulating cooling water station
In the circulating water station, the cooling water is used repeatedly. After the water passes through the heat exchange equipment, the temperature rises. The cooling tower or other cooling equipment reduces the water temperature, and then the pump sends the water to the cooling station for reuse. This greatly improves the reuse rate of water and saves a lot of industrial water. . Circulating cooling water stations are divided into closed and open two types.
Closed circulating cooling water station
The water circulates for heat exchange in this kind of closed station, and the cooling water does not directly contact the atmosphere after it rises up, but is reused in another heat exchange equipment after being exchanged and cooled by other cooling media to cool the high temperature heat medium. This kind of closed station must use soft water or pure water with very low salt content. During the cooling water cycle, it is not directly exposed to the air, and the water loss is small. The content of various minerals and ions in the water generally does not change. Dissolved oxygen The content of impurities is very small, and it is not in contact with the sun, which is not conducive to the growth and reproduction of microorganisms such as bacteria and algae. The scale and corrosion in the station are less likely to occur, and the amount of sewage discharged is also small. Therefore, the water quality treatment method of this station is relatively simple and easy to maintain. Moreover, the amount of supplementary water is very small, which is conducive to the conservation of water resources.
Open circulating cooling water station
In the open-type circulating cooling water station, the cooling water is also used in circulation, but the re-cooling of the water is carried out through the cooling tower (pool). The cooling water must contact the air during the circulation process. Part of the water will be used when passing through the cooling tower. Lost by evaporation. When the ion content in the station reaches a certain value, a certain amount of fresh water must be added
