Heat exchanger causes excessive pressure drop
① normal operating system does not purge the pipeline, especially the new heat exchanger installed in the piping system, many of dirt (such as welding slag, etc.) into the plate heat exchanger inside, the plate heat exchanger narrow flow channel cross-sectional area , the heat exchanger inside the sediment and suspended matter gathered in the corner hole and diversion areas, leading to their greatly reduced the flow area, resulting in major loss of pressure in this area.
② plate heat exchanger when the first selection area is too small, causing high pressure drop flow between the plates is too large.
③ plate heat exchanger to run for some time, due to plate surface scaling caused by excessive pressure drop.Example: In 2000 I plant to provide users with a BR10 ** type plate heat exchanger, water-water heat exchanger for central heating systems, designed a water temperature of 130. C. In the heat exchanger design selection, the number of high heat conductivity, close to 5500 w / (rn • K), while the actual should be in 3500 w / (rn • K).Meanwhile, the design units in the pump selection and flow margin is too large, resulting in heat flow between the secondary side of the media board 1 m / s, the actual operation of the pressure drop in the 0.2 ~ 0.3 MPa, making the net water balance of serious secondary disorders.
Heat exchanger article: http://www.whreactor.com/
Keywords: reactor; pressure vessel
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