Shell and plate heat exchangers are heat exchangers with plate and tube as heat transfer elements, also known as sheet heat exchangers. Shell and plate heat exchangers are mainly composed of tube bundles and shell parts (figure). The contact points of cold-formed pairs of strips are tightly welded together to form a sheet tube with multiple flat runners. Many plates and tubes with different widths are arranged in a certain order. In order to maintain the spacing between plates and tubes, metal strips are inserted at both ends of adjacent plates and tubes and welded together with plates and tubes. Tube sheets are formed at both ends of the sheet and tube, so that many sheet and tube are firmly connected together to form sheet and tube bundles. The end face of the plate and tube bundle shows several flat channel plate and tube bundles assembled in the shell, and the longitudinal expansion difference between the shell and plate heat exchanger is eliminated by sliding seal. The cross section of the equipment is generally round, but also rectangular, hexagonal and so on.
Shell and plate heat exchanger is a structural form between shell-and-tube heat exchanger and plate heat exchanger, which takes into account the advantages of both.
(1) The heat transfer efficiency is good when the plate is used as the heat transfer surface. The heat transfer coefficient is about twice that of shell and tube heat exchangers.
(2) Compact structure and small volume.
(3) Temperature resistance and pressure resistance. The maximum working temperature can reach 800 C and the maximum working pressure can reach 6.3 MPa.
(4) High-speed flow of fluid in flat runner, smooth plate surface, not easy to scale, plate bundle can be dismantled, and cleaning is convenient.