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How to improve the surface heat transfer coefficient of plate heat exchanger?

2021-11-25 15:01:45
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1. Reduce the thermal resistance of dirt layer

The key to reduce the thermal resistance of fouling layer of plate heat exchanger is to prevent plate fouling. When the plate fouling thickness is 1 mm, the heat transfer coefficient decreases by about 10%. Therefore, it is necessary to monitor the water quality on both sides of the heat exchanger to prevent the scaling of the plates and the adhesion of sundries in the water to the plates. In order to prevent water theft and corrosion of steel parts, some heating units add chemicals to the heating medium. Therefore, it is necessary to pay attention to the contamination of heat exchanger plates by impurities caused by water quality and adhesive. If there are viscous sundries in the water, special filters shall be used for treatment. When selecting agents, non viscous agents should be selected.

2. Select plates with high thermal conductivity

The plate material can be austenitic stainless steel, titanium alloy, copper alloy, etc. Stainless steel has good thermal conductivity, thermal conductivity of about 14.4 w / (m • K), high strength, good stamping performance, not easy to be oxidized, lower price than titanium alloy and copper alloy. It is used Zui more in heating engineering, but its ability to resist chloride ion corrosion is poor.

3. Reduce plate thickness

The design thickness of the plate has nothing to do with its corrosion resistance and is related to the pressure bearing capacity of the plate heat exchanger. The plate thickening can improve the pressure bearing capacity of the heat exchanger. When the herringbone plate combination is adopted, the adjacent plates are inverted and the ripples are in contact with each other, forming a fulcrum with high density and uniform distribution. The plate corner L and edge sealing structure have been gradually improved, so that the heat exchanger has good pressure bearing capacity. The pressure bearing capacity of domestic removable plate heat exchanger Zui has reached 2.5 MPa. The plate thickness has a great influence on the heat transfer coefficient. When the thickness is reduced by 0.1mm, the total heat transfer coefficient of symmetrical plate heat exchanger increases by about 600W / (m • K), and that of asymmetric plate heat exchanger increases by about 500 W / (m • K). On the premise of meeting the pressure bearing capacity of the heat exchanger, the smaller plate thickness shall be selected as far as possible.

Heat exchanger plate

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