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How to improve the efficiency of plate heat exchanger?

Source : Time : 2023-08-07 15:31:27 Clicks : 852

The frequency of use of plate heat exchangers is relatively high. Properly increasing the heat transfer coefficient of the heat exchanger can only increase the surface heat transfer coefficient of the hot and cold sides of the plate at the same time, reduce the thermal resistance of the dirt layer, and select plates with high thermal conductivity to reduce the heat transfer coefficient. The thickness of the small plate can effectively improve the heat transfer coefficient of the heat exchanger.

1. Because the corrugation of the plate heat exchanger can make the fluid turbulent at a small flow rate, it can obtain a high surface heat transfer coefficient, which is related to the geometric structure of the plate corrugation and the flow state of the medium. The waveform of the plate includes herringbone, straight, spherical and so on. After years of research and experiments, it is found that the herringbone plate with a triangular corrugated section has a higher surface heat transfer coefficient, and the larger the angle between the corrugations, the higher the flow rate of the medium in the flow channel between the plates, and the greater the surface heat transfer coefficient .

2. The key to reducing the thermal resistance of the fouling layer of the heat exchanger is to prevent the fouling of the plates. When the scale thickness of the plate is 1 mm, the heat transfer coefficient is reduced by about 10%. Therefore, attention must be paid to monitoring the water quality on both the cold and hot sides of the heat exchanger to prevent scaling of the plates and prevent impurities in the water from adhering to the plates. In order to prevent water theft and corrosion of steel parts, some heating units add chemicals to the heating medium, so attention must be paid to water quality and adhesives causing sundries to contaminate the heat exchanger plates. If there are viscous debris in the water, special filters should be used for treatment. When choosing a medicament, it is advisable to choose a non-sticky medicament.

3. Plate material can choose stainless steel, titanium alloy, copper alloy, etc. Stainless steel has good thermal conductivity, the thermal conductivity is about 14.4 W/(m•K), high strength, good stamping performance, not easy to be oxidized, and the price is lower than titanium alloy and copper alloy. It is often used in heating engineering, but its Poor resistance to chloride ion corrosion.


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