What is the key to improving the heat transfer efficiency of plate heat exchangers

Date:2021-01-05

The plate heat exchanger is divided into two installation methods according to whether there is a saddle support or not.

The first is that for plate heat exchangers without saddle brackets, the heat exchanger should be installed on a brick saddle foundation. After installation, the plate heat exchanger does not need to be fixed to the foundation at the moment, and the entire plate exchange can expand with expansion. The changes move freely.

In the second type, for the slab replacement with saddle support, the concrete should be laid flat on the foundation first, and the saddle support should be completely fixed to the ground concrete with anchor bolts after it is completely dry.

During the installation of the plate heat exchanger, sufficient space should be left at the front and rear ends of the heat exchanger for maintenance and cleaning. The heat exchanger shall not be operated under the conditions specified on the nameplate. The temperature and pressure of the heat exchanger medium must be observed and analyzed to prevent abnormal operation of the heat exchanger.

The heat exchange effect of the heat exchanger has a lot to do with scale. The more scale, the less ideal the heat exchange effect. Therefore, the scale on the heat exchange fins should be cleaned in time. In order to avoid excessive fouling affecting the heat exchange effect

 

 

The titanium plate heat exchanger is a wall-to-wall heat exchanger. The hot and cold fluid transfers heat through the heat exchanger plates, and the fluid directly contacts the plates. The heat transfer method is heat conduction and convection heat transfer. The key to improving the heat transfer efficiency of the plate heat exchanger is to increase the heat transfer coefficient and the logarithmic average temperature difference.

① Improve heat transfer coefficient of heat exchanger

Only by simultaneously increasing the surface heat transfer coefficient of the hot and cold sides of the plate, reducing the thermal resistance of the dirt layer, choosing a plate with high thermal conductivity and reducing the thickness of the plate, can the heat transfer coefficient of the heat exchanger be effectively improved.

② Increase the logarithmic mean temperature difference

The flow patterns of plate heat exchangers are countercurrent, cocurrent and mixed flow (both countercurrent and cocurrent). Under the same working conditions, the logarithmic mean temperature difference is the largest in the countercurrent flow and the smallest in the downstream flow, and the mixed flow pattern lies between the two. The method to increase the logarithmic mean temperature difference of the heat exchanger is to use countercurrent or close to countercurrent mixed flow as much as possible, increase the temperature of the fluid on the hot side as much as possible, and reduce the temperature of the fluid on the cold side.

③ Determination of the position of inlet and outlet pipes

For plate heat exchangers arranged in a single process, for easy maintenance, the fluid inlet and outlet pipes should be arranged on the side of the fixed end plate of the heat exchanger as much as possible. The greater the temperature difference of the medium, the stronger the natural convection of the fluid, and the more obvious the influence of the retention zone. Therefore, the inlet and outlet positions of the medium should be arranged in accordance with the hot fluid in and out, and the cold fluid in and out to reduce the influence of the retention zone , Improve heat transfer efficiency.

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