Plate heat exchanger liquid string how to do?

The main characteristic is that the medium of the high pressure side enters into the medium with lower pressure. If the medium is corrosive, it may lead to corrosion of other equipment in the pipeline. The fluid usually occurs in the diversion area or the two sealing area.

What are the causes of the liquid in the plate heat exchanger?

1, due to the improper selection of plate caused by corrosion or crack.

2. The residual stress and the small size of the clamping in the cold forming of sheet metal caused stress corrosion.

3, operating conditions do not meet the design requirements.

4, there is a slight leakage of the plate leakage tank, resulting in harmful substances in the media (such as C1) concentrated corrosion plate, forming a string of liquid. Example: the BR03 plate heat exchanger with 1 plates in the sulfuric acid system of an Aluminum Co., Ltd. is a plate with a temperature of about 254 SMo. After running for two months, the corrosion of the carbon steel pipe on the cooling water side appears, and the acid leaks to the cooling water side. It is found that there is a serious corrosion and cracking phenomenon at the inlet and diversion area. The results show that the operating temperature, flow rate and concentration of the system are beyond the design conditions. Plate heat exchanger is a kind of plate heat exchanger in which the saturated steam is used as the primary heat source. This is due to the high steam temperature, equipment operation is easy to cause the rubber gasket failure at high temperature, resulting in the leakage of steam and in the two sealing area rapid condensation. With the continuous development of the external leakage, the more condensed liquid, the higher the CL mass concentration, and the corrosion condition of the surface passivation layer. At the same time, because of the internal stress formed by the cold stamping of the plate in the region, and the surface passivation layer is damaged, the internal stress will lead to the occurrence of stress corrosion.

What are the methods of plate heat exchanger?

1, the replacement of cracks or perforated plate, in the field of transparent method to find the plate crack.

2, heat exchanger maintenance assembly clamping size should meet the requirements, not the smaller the better.

3, adjust the operating parameters to achieve the design conditions.

4, sheet material reasonable match.