Plate Heat Exchanger For marine

These plates are metal pressed parts with horizontal or herringbone corrugations. These make the board harder, thus allowing the use of thinner materials. They also increase the heat exchange area and generate turbulence. All these factors contribute to improving the efficiency of heat transfer. In contrast to smooth flow, turbulence causes more liquid passing between the plates to come into contact with them. It also destroys the liquid boundary layer attached to the metal and acts as an insulating layer in smooth flow. However, turbulence can cause plate damage due to corrosion, and the materials commonly used in pipeline coolers for contact with seawater may not be suitable for plate coolers.

The plate used for seawater contact is titanium. This is an expensive metal, but it can obviously withstand the conditions of use. The effect of using aluminum brass is not good. The possible failure of aluminum brass is due to the presence of organic sulfides and other chemicals in coastal and inland waters. Titanium is not subject to this type of attack. However, other factors, such as turbulence in the plate cooler or changes in the material of the seawater system, may be the cause of the early failure. Stainless steel has been used in plate coolers for seawater, but although it is not suitable for other applications, it has proved unsuccessful.

In plate heat exchangers, the joint material is usually "nitrile rubber", which is bonded to the plate with a suitable adhesive (eg "Plibond"). Other higher temperature joint materials can also be used, such as compressed asbestos fiber (CAF). Nitrile rubber is suitable for temperatures of approximately 100 degrees. Celsius temperature At higher temperatures, the rubber hardens and loses its elasticity. When assembling the cooler and tightening the tightening bolts, the rubber joint is compressed.

Over-tightening will damage the herringbone corrugated board. Due to over-tightening, the pressure drop across the cooler will also increase. At the same time, loosely tightened plates can cause inefficient sealing between the plates. Check the dimensions when tightening and loosening the plate cooler. The joint must be fully clamped to prevent leakage.

All liquid inlets and outlets are fixed end plates. The movable ends are located in horizontal load-bearing rods, and the plates are also positioned and supported by these load-bearing rods. The flow ports arranged at the corners of the plates allow the cooling liquid and the cooled liquid to pass between alternating plate pairs. The best efficiency can be obtained by the liquid moving in the opposite direction. Except for the double joints on the ports on the side of the board, joint leaks are visible on the outside. The drain hole serves as the story of his area.