If the plate heat exchanger works for a long time, it will produce different degrees of dirt on the surface of the heat transfer plate. The generation of fouling will increase the flow resistance and reduce the heat transfer performance. It is mainly manifested in the increase in the pressure difference between the inlet and outlet pressure gauges and the decrease in the outlet temperature of the cold medium. At this time, the plate heat exchanger should be cleaned up. After the plate heat exchanger is cleaned, it should be debugged and tested.
(1) A certain inspection site should be reserved around the place where the plate heat exchanger is installed.
(2) Clean the pipes connected to it before installation to prevent sand, oil, welding slag and other debris from entering the plate heat exchanger, causing obstruction of the flow passage or damage to the plate. The plate heat exchanger has a small footprint and light weight. In addition to the volume of the equipment itself, there is no need to reserve additional space for inspection and installation.
(3) The sequence of opening and stopping of the plate heat exchanger. When the heat exchanger is stopped, first close the high-pressure side medium solenoid valve, and then close the low-pressure side medium solenoid valve. In an environment of high efficiency, environmental protection and energy saving, the advantages of plate heat exchangers in the field of heat exchange have become increasingly prominent. It can be used for heating, cooling and food disinfection in various processes. In terms of low-grade heat energy recovery, it also has significant economic benefits.
(4) Before the plate heat exchanger is put into use, check the looseness of the clamping bolts. If there is any looseness, it should be tightened.