Plate heat exchangers are widely used in life, not only for ice storage systems, air conditioners, but also for pressure blockers in high-rise buildings, but plate heat exchangers are prone to scale after a period of use. What is the dirt of the plate heat exchanger?
(1) In the plate heat exchanger in which water-water is exchanged, the dirt to be removed during the cleaning process is mainly water scale. Because its hot and cold medium is water, and the temperature is maintained between 70 ℃ and 90 ℃, it is easy to cause various salts such as sulfates, carbonates and silicates produced in the water to decompose after being heated. When the solubility is lowered, crystals are precipitated in the water, and scale forms on the heat transfer plates, which is difficult to remove.
(2) In the plate-type heat exchanger with steam-water exchange mode, the dirt to be removed during the cleaning process mainly includes oil, debris, sedimentary mud and some small particles of dust and sediment. Although such soils are relatively bulky, they are relatively soft and loose compared to scale and they are easily removed during the cleaning of the plate heat exchanger.