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Hofmann (Beijing) Engineering Technology Co.,Ltd

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Causes of large pressure drop in plate heat exchanger
Aug 03, 2018

1. The running system pipeline is not properly purged, especially in the newly installed system pipeline, many dirt (such as welding slag) enters the interior of the plate heat exchanger. Because the cross-sectional area of the plate heat exchanger is narrow, change Precipitates and suspended solids in the heat accumulator accumulate at the corner holes and in the diversion zone, resulting in a large reduction in the flow path area there, causing a major loss of pressure at this location.

2. After the plate heat exchanger has been running for a period of time, the pressure drop caused by the surface fouling of the plate is too large. Example: In 2000, our factory provided BR10 type plate heat exchanger for the users of Xinjiang, which is used for the centralized heating system of water-water heat exchange. The design temperature of the primary water supply is 130. C. In the design of the heat exchanger, the heat transfer derivative is high, close to 5 500 w/(rn · K), and should actually be 3 500 w/(rn · K). At the same time, the flow rate of the design unit is too large when the pump is selected, causing the flow rate between the dielectric plates on the secondary side of the heat exchanger to exceed 1 m/s, and the actual operating pressure drop is 0.2-0.3 MPa, making the second The net hydraulic balance is seriously out of balance.

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

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