What are the common causes of abnormal pressure drop in heat exchangers?

1. Flow channel blockage
Reason: The operating system pipeline is not properly purged, especially in the newly installed system pipeline, many dirt (such as welding slag, etc.) enter the interior of the heat exchanger, resulting in a decrease in the cross-sectional area of ​​the flow channel and an increase in flow resistance.
Solution: Clean the inside of the heat exchanger regularly to ensure that the flow channel is unobstructed.
2. Improper selection
Reason: The area of ​​the heat exchanger was too small when it was first selected, resulting in too high flow rate between the plates and a large pressure drop.
Solution: Reselect the model according to the actual working conditions to ensure that the heat exchange area and flow rate are reasonably designed.
3. Scaling
Reason: After the heat exchanger has been running for a period of time, the pressure drop is too large due to scaling on the surface of the plate.
Solution: Perform chemical cleaning or jet cleaning regularly to remove scale.
4. Flow change
Reason: The actual flow rate is greater than the design value, resulting in an increase in flow rate and pressure drop.
Solution: Check the system flow and adjust it to the design value.
5. Plate or tube bundle problem
Reason: The entrance of the plate corner hole is blocked, or the tube bundle is blocked by scale.
Solution: Clean the blocked part and replace the plate or tube bundle if necessary.
6. Water quality problem
Reason: Poor water quality leads to scaling or corrosion.
Solution: Strengthen water quality management, use softened water or add scale inhibitor.
7. Equipment aging
Reason: The equipment has been running for a long time, and the parts are aged or damaged.
Solution: Check the equipment regularly and replace the aged parts in time.
8. Improper operation
Reason: Frequent start and stop of the equipment leads to misalignment or damage of the sealing gasket.
Solution: Avoid frequent start and stop to ensure stable operation of the equipment.