Plate heat exchanger is a kind of heat exchanger formed by pressing thin metal plates into heat exchange plates with a certain corrugated shape, and then fastening them with frame plates and bolts after stacking. During the use of the plate heat exchanger, the water treatment equipment is improperly operated, and the water quality control is not up to the standard. The calcium, magnesium, and carbonate in the water are decomposed into calcium carbonate and magnesium hydroxide after being heated. The deposits are deposited on the plates of the heat exchanger. Thus formed scale.
Due to the poor thermal conductivity of scale, the heat exchange efficiency of the heat exchanger is reduced and the heat energy is wasted seriously, thereby affecting the heating effect.The fouling of the plate heat exchanger will seriously affect the heat exchange efficiency of the plate heat exchanger, because most of the plate heat exchangers are heat exchange systems with water as the heat carrier. Because some salts change from Crystals precipitate out in water and adhere to the surface of the heat exchange tube to form scale.Adding a polyphosphate buffer to the cooling water can also cause scale precipitation when the pH of the water is high. The scale formed in the initial stage is relatively soft, but as the scale layer is formed and the heat transfer conditions deteriorate, the scale will harden and firmly adhere to the surface of the heat exchange tube.When the working conditions of the heat exchanger are suitable for the precipitation of crystals from the solution, the scale layer formed by the crystallization of materials can accumulate on the surface of the heat exchange tube. When the fluid contains more mechanical impurities and organic matter, and the flow rate of the fluid is low, some mechanical impurities or organic matter will also be deposited in the heat exchanger, forming loose, porous or colloidal dirt.