Cooling water system scale features what is?

Cooling water supply is divided into two types of open and circulating, open water supply, raw water from the water to pass through the condenser equipment once, drain off no longer use, usually in sufficient water, If the river, river, sea or reservoir, most of this way; recycled water supply, cooling water through the condenser, through the cold water tower or fountain, reduce the temperature and then used as a cooling medium, this water supply The cooling water, also known as circulating water.

As the cooling water contains many impurities, including inorganic matter also has organic matter, they are likely to attach to the copper tube, often referred to as inorganic attachments scale.

Open cooling system compared with the circulating cooling system. Recycling cooling system easy to produce carbonate scale, this is because the cooling water in the cycle, there is a continuous evaporation and concentration phenomenon. Circulating water flow (in power plants, for example): Circulating water from the condenser out, cooled by the cooling tower, with a circulating pump back to the condenser re-use. Cooling water in the process inevitably have a lot of water to be lost, of which the loss of evaporation is very pure water, so the quality of recycled water and make-up water compared to the quality of the concentration phenomenon. In this way, the concentration of Ca (HCO3) 2 in the water is getting larger and larger, which is the main factor that causes it to decompose to form CaCO3. When the circulating water is concentrated to a certain extent, CaCO3 will precipitate the reaction. The reaction is

Ca (HCO3) 2 → CaCO3 ↓ + CO2 ↑ + H2O