When it comes to water-water plate heat exchangers, most people may not be very familiar with them, but what everyone needs to know is that they have many and extensive uses. For example, water-water plate heat exchangers are installed in central air conditioning systems. So why are the ShuiShui plate heat exchangers so widely used? Let me briefly introduce it to you.

The internal fluorine water heat exchanger of the water system air conditioning unit serves to exchange heat with auxiliary refrigerants. Typically, there are three types of heat exchangers: double-tube heat exchangers; shell-and-tube heat exchangers; The first two types of plate heat exchangers are generally used in large units, with advantages such as low pressure loss, low water quality requirements, and resistance to clogging. Water-water plate heat exchangers are generally used in small units, with advantages such as compact size and high efficiency. If it is a water system main unit, a heat exchanger is required, and a water-water plate heat exchanger is a better choice.

However, as usage time increases and environmental factors increase, corrosion problems gradually develop in Shui-Shui plate heat exchangers, which is a common phenomenon. Severe corrosion can affect the performance of equipment. So, which parts are prone to corrosion?

1. Shell corrosion

If the dielectric in the casing is electrolyte, and the tube bundle baffle is made of copper alloy and the casing material is carbon steel, it is prone to corrosion. If the welding quality of the casing and accessories is too poor, the water-water plate heat exchanger is prone to corrosion.

2. Corrosion of heat exchange tubes

Dirt in the medium and eddy current wear in the inlet medium can cause pipeline corrosion, especially at the front inlet, which is prone to corrosion, mainly because fluids and dead corners easily generate vortex agitation.

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

The joints between the heat exchange tubes and tube sheets, as well as between the heat pipes and baffles in the water-water plate heat exchanger, are prone to cracking in the expansion tubes. When there is a gap between the tube sheet and the tube, CL accumulates and oxygen concentration occurs, which causes corrosion on the surface or gaps of the heat exchange tube.

Breaks at the junctions of pipes and baffles are usually caused by more baffles and longer pipes. The baffle plate and tube wall easily cause local stress concentration, which can lead to price differences, making this part a weak link in corrosion of water-water plate heat exchangers.

The main reason for corrosion in water-water plate heat exchangers is that most heat exchange equipment uses water for heat exchange. As the temperature rises, certain salts crystallize and adhere to surfaces, forming scale. At first, scale is relatively soft, but as the scale layer forms, it gradually hardens and slowly fixes on the surface of the heat exchange tube.

Therefore, if you understand these corrosion-prone components of the Shui-Shui plate heat exchanger, you should pay extra attention during normal use and perform regular maintenance to effectively reduce the corrosion area. Alternatively, you can choose some corrosion-resistant types, but these types of water-water plate heat exchangers are relatively expensive, so you can choose according to your budget.