Reasons and solutions for easy fouling of plate heat exchangers
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 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, the heat transfer conditions deteriorate, the crystal water in the scale gradually loses, and the scale layer becomes hard and adheres to the surface of the heat exchange tube.
In addition, just like scale, when the working conditions of the heat exchanger are suitable for the precipitation of crystals from the solution, a scale layer formed by the crystallization of the material may accumulate on the surface of the heat exchange tube; when the fluid contains more mechanical impurities and organic matter, the flow rate of the fluid When it is smaller, some mechanical impurities or organic matter will also be deposited in the heat exchanger, forming loose, porous or colloidal dirt.
