The plate heat exchanger is a high-efficiency heat exchanger which is assembled from a series of metal sheets with a certain corrugated shape. The plate heat exchanger plate is specially used for the plate heat exchanger to isolate the medium and exchange heat, and is an important part of the plate heat exchanger.Harm of colloidal impurities on heat exchanger plates
(1) The main component of the iron compound is Fe2O3, which generates iron scale. When the water contains more iron compounds, the water is often yellow.
(2) Microorganisms.Since the water temperature, dissolved oxygen, and nutrients of the air-conditioning cooling circulating water provide conditions for the microorganisms to be propagated, the microorganisms multiply.The microorganisms are derived from the soil and the air. When the temperature of the cooling circulating water is high, the oxygen is increased by aeration through the cooling tower.Phosphate and other chemicals are often added to the water, which is just the microbial nutrient. The cooling tower is mostly located in the open air. The sunlight is good for algae growth. The microbial reproduction not only blocks the plate passage, but also blocks the pipeline. It also corrodes the metal.
(3) The sludge in the cooling circulating water is derived from the dust in the air and the suspended matter in the supplementary water. During the convective exchange of air and water, a large amount of air is sprayed with circulating water in the tower, so that the dust enters the water and is gradually deposited in the heat exchanger with a lower flow rate.
(4) The slime is caused by the secretion of microorganisms and the sediment, corrosion products and algae residues in the water. They are often attached to the wall of the heat exchanger to produce various organic acids, which also cause corrosion.