Why is the pressure drop of the plate heat exchanger large? How to solve it?

The pressure drop of the plate heat exchanger is large: the pressure drop of the medium inlet and outlet exceeds the design requirements, or even many times higher than the design value, which seriously affects the system's requirements for flow and temperature. In the heating system, if the pressure drop on the hot side is too large, the primary side flow will be seriously insufficient, that is, the heat source is not enough, resulting in the secondary side outlet temperature not meeting the requirements

Reasons for the large pressure drop of the plate heat exchanger:

1. The pipeline of the operating system is not normally purged, especially when many dirt (such as welding slag) in the pipeline of the newly installed system enters the inside of the plate heat exchanger. Due to the narrow cross-sectional area of the flow channel of the plate heat exchanger, the exchange The sediment and suspended matter in the heat exchanger gather at the corner hole and the diversion area, which causes the flow channel area to be greatly reduced, causing the main pressure loss in this part.

2. When the plate heat exchanger is selected for the first time, the area is too small, which causes the flow velocity between the plates to be too high and the pressure drop is too large.

3. After the plate heat exchanger has been running for a period of time, the pressure drop is too large due to fouling on the plate surface.

Treatment method for large pressure drop of plate heat exchanger:

1. Remove the dirt or plate fouling in the flow channel of the heat exchanger. For the newly operating system, clean it regularly according to the actual situation.

2. It is better to use soft water after softening treatment for secondary circulating water

3. For the central heating system, the method of replenishing water once to the second time can be used