In many cases, the plate heat exchanger is prone to fouling, which will seriously affect the heat exchange efficiency of the plate heat exchanger, because the plate heat exchanger is mostly a heat exchange system using water as a heat carrier, due to certain salts When the temperature rises, it crystallizes out from the water, adheres to the surface of the heat exchange tube, and forms scale.

Adding polyphosphate buffers to the cooling water can also cause scale precipitation when the pH of the water is high. The scale initially formed is relatively soft, but with the formation of the scale layer, the heat transfer conditions deteriorate, the crystal water in the scale gradually loses, the scale layer becomes hard, and is firmly attached to the surface of the heat exchange tube.

In addition, like scale, 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 the material can accumulate on the surface of the heat exchange tube; When the flow rate is small, some mechanical impurities or organic matter will also be deposited in the heat exchanger, forming loose, porous or colloidal dirt.

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