The plate and shell heat exchanger is a structural form between the tube and shell heat exchanger and the plate heat exchanger, which takes into account the advantages of both:
① With the plate as the heat transfer surface, the heat transfer efficiency is good. The heat transfer coefficient is about twice that of the shell and tube heat exchanger.
② Compact structure and small volume.
③ Temperature and pressure resistance, the highest working temperature can reach 800 ℃, and the highest working pressure can reach 6.3 MPa.
④ The fluid in the flat flow channel flows at high speed, and the surface of the plate is smooth, it is not easy to scale, the plate bundle can be removed, and the cleaning is convenient. However, the manufacturing process of this heat exchanger is more complicated than that of the shell-and-tube heat exchanger, the welding volume is large and the requirements are high, so its promotion and application are limited. Plate and shell heat exchangers are used in chemical, paper, pharmaceutical and food industries. Typical products are mainly used in food and pharmaceutical processing industries that require good heat transfer efficiency and short residence times.