Plate heat exchanger is a kind of high efficiency heat exchanger which is composed of a series of corrugated metal plates. A thin rectangular passage is formed between the plates through which heat is exchanged. Plate heat exchanger is an ideal equipment for liquid - liquid and liquid - vapor heat exchange. It has the characteristics of high heat exchange efficiency, small heat loss, compact and light structure, small floor space, wide application and long service life. Under the same pressure loss, the heat transfer coefficient is 3-5 times higher than that of the tubular heat exchanger, covering an area one-third of that of the tubular heat exchanger, and the heat recovery can be as high as over 90%

Removable plate heat exchanger is made up of many stamping with corrugated sheet in a certain interval, all round through the gasket seal, with overlapping framework and compression screw compression, plate and gasket four Angle hole forming fluid distribution pipe and gathering, reasonably separate hot and cold fluid again at the same time, make its respectively in each panel on both sides of the flow in the flow channel, through the plate heat exchanger.

The optimal design calculation of plate heat exchanger is to reasonably determine its model, flow and heat transfer area under the condition of known temperature difference ratio NTUE, so that NTUp is equal to NTUE.