What are the corrosive parts of the plate heat exchanger

Date:2020-09-01

As the use time is long, the plate heat exchanger will gradually appear corrosion, which is also a common phenomenon. What areas does the plate heat exchanger corrosion easily occur in?

1. The outer shell is corroded

If the medium in the shell is an electrolyte, and the tube bundle baffle is made of copper alloy, and the shell material is carbon steel, it will be prone to corrosion. If the welding quality of the shell and accessories is too poor, the plate heat exchanger will be prone to corrosion.

2. Corrosion of heat exchange tube

The dirt in the medium and the eddy current wear in the inlet medium have caused corrosion in the pipeline, especially at the front entrance, which is prone to corrosion, mainly because the fluid and dead corners are prone to vortex agitation.

3. Joints between baffles, pipes and tube sheets are prone to joint corrosion

The connection between the heat exchange tube and the tube sheet, as well as between the heat exchange tube and the baffle plate, is prone to cracks in the expansion tube. When there is a gap between the tube sheet and the tube, there will be cl+ accumulation and oxygen concentration difference, which will cause corrosion on the surface of the heat exchange tube or the gap.

 

 

The ruptures at the junction of pipes and baffles are often caused by more baffles and long pipes. It is easy to cause local stress concentration on the baffle and tube wall, which is easy to price gap, so this part becomes the weak link of plate heat exchanger corrosion.

The main reason for the corrosion of plate heat exchangers is that most of the heat exchange equipment uses water for heat exchange. A certain salt crystallizes as the temperature rises and adheres to the surface to form scale. At the beginning, the scale is relatively soft, but as the scale layer is formed, it will gradually become harder and will gradually be fixed on the surface of the heat exchange tube.

In addition to the above, when the heat exchange equipment process is suitable for diluting the solution to crystallize, there will be a scale layer of crystals on the surface of the heat exchanger, and there will be a lot of impurities in the fluid, so when the fluid flow rate is small, the machine The impurities or organic matter will sink to the bottom and form sparse dirt.

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