Control method of sediment in circulating cooling water
During the operation of the distributed circulating cooling water system, it communicates with the atmosphere. Wind, sun, rain, etc. bring various pollutants and scales, and the growth of microorganisms (water treatment equipment) forms various substances. The deposition on the surface of the heat transfer tubes of the heat exchanger affects the normal operation of the circulating cooling water system.
(1) Control of dirt.
Usually, mud, corrosion products and biological deposits are collectively referred to as fouling. Dirt generally comes from supplemental water turbidity, fine sediment, dust, natural organic matter, hydrolyzed products of coagulants, corrosion products of equipment, leakage of process media, metabolic deposits of microorganisms, and viscous secretions. With the circulation and concentration of the cooling water, these substances gradually increase, and when passing through the surface of the heat exchanger, dirt deposits are formed. Because of the large size of the dirt and the loose texture, it is called soft dirt. These dirts are the survival and reproduction of bacteria. The hotbed is also the main cause of corrosion under scale. Because the soft dirt is loose and soft in texture, it does not adhere tightly to the surface of the equipment and is easy to clean. Sometimes it can be removed by simply rinsing with water. But during operation, fouling, like scale, will also affect the heat transfer efficiency of the heat exchanger. In addition, dirt and scale, microbial slime, etc. are deposited on the heat transfer surface, which promotes the reproduction of bacteria, which will seriously lead to corrosion, perforation and even leakage of the pipe wall.
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