The plate heat exchanger is a high-efficiency heat exchanger which is assembled from a series of metal sheets with a certain corrugated shape.A plurality of flow passages having small flow cross sections are formed between the plates of the heat exchanger, and heat exchange is performed through the plates.Compared with conventional shell-and-tube heat exchangers, the heat transfer coefficient of plate heat exchangers is much higher under the same flow resistance and pump power consumption.Plate heat exchanger technology has been rapidly developed in the following areas:
(1) The plate heat exchanger unit and the single-chip area are large-sized. For example, the largest single-piece area of the British APV company is 4.75 ㎡ / piece, and the single heat exchange area is 2500 ㎡ / Unit
(2) Using gaskets without glue connection technology, the time for installation and maintenance of plate heat exchangers is saved by 80%
(3) Two different waveform angles are designed from one type of plate to meet the occasions and application ranges with different pressure drop requirements
(4) The plate material is diversified, such as stainless steel, high chromium nickel alloy, Monel Hastelloy. Graphite heat exchangers have also appeared.