There are two main types of plate heat exchangers: frame type (removable type) and brazed type. The plate types are mainly three kinds of herringbone corrugated plate, horizontal and straight corrugated plate and knob-shaped plate. Plate heat exchanger is a new type of high-efficiency heat exchanger formed by stacking a series of metal sheets with certain corrugated shapes.Most of the methods for maintenance of plate coolers use direct flushing methods. How to clean and maintain the plate cooler.
(1) The non-removable plate cooler can adopt the reverse direction flushing method to flush out a small amount of sediment and impurities in the plate cooler. But the pressure cannot exceed the pressure allowed by the work. Non-corrosive chemical cleaning can also be performed on the cooler.
(2) If the heat exchanger can be disassembled, it can be dismantled and cleaned regularly according to the water quality, medium, and temperature of the equipment and the actual situation on the spot.
The most used cleaning agent for chemical impurities is acid. The material of the cooler is various. If strong acid is used, it will corrode the plate and affect the life of the cooler. Therefore, nitric acid and formic acid are generally used, which can be self-passivated in the air after cleaning.
Increasing the pickling temperature can also improve the descaling effect, but the temperature cannot be too high (generally 60d degrees). The dismountable plate cooler cannot be cleaned with a metal brush, otherwise it will damage the plate.