The plate heat exchanger has the characteristics of light weight, small floor space, low investment, high heat exchange efficiency, flexible assembly, easy to remove scale, and its role in heating work.Three common causes of failure of plate heat exchanger.
1. A common cause of plate heat exchanger failure is fouling
The fouling of the plate heat exchanger reduces the heat transfer coefficient and,blocks the plate passage in severe cases.The plate heat exchanger plate design has a large number of support contacts, which is a place where solid impurities or fibers are easy to accumulate, and it is easy to cause local retention of fluid and scale.In addition, Ca2+ and Mg2+ in the medium will precipitate solids to form scale, and the scale and plugging cause are different, but the effect is the same.
Precautions for scaling of plate heat exchangers: (1) Plate heat exchangers should not be used in dirty or fouling environments. (2) When using unsoftened cooling water as the medium, the operating temperature should be controlled below 50 °C.
2. Plate heat exchanger blockage
The plate heat exchanger has a small flow path clearance (2.5 to 6.0 mm). A debris having a diameter greater than 1.5 to 3.0 is likely to block the passage leading to equipment failure.
Precautions for clogging of plate heat exchanger: A filter or flushing device is installed at the inlet of the medium to effectively prevent clogging of the equipment and improve heat transfer.
3. Plate heat exchanger gasket failure
Plate heat exchangers exhibit leakage at rated working pressures, which are primarily related to sudden changes in system pressure and temperature, equipment manufacturing.The instantaneous pressure drop caused by the impact tends to be 2 to 3 times higher than the normal pressure, causing the installed rubber gasket to displace and fail.When the temperature changes too fast, the elasticity of the gasket does not match the sealing preload, causing the equipment to withstand pressure below the rated design pressure.
Precautions for the failure of the plate heat exchanger gasket: (1) Try to avoid the impact of the system during operation (2) increase the design pressure of the equipment by 1.5-2.0 times depending on the operating pressure. (3) Take other measures to compensate for changes in the seal preload. (4) During operation, the temperature rise and pressure rise process should be as slow as possible.