The all-welded plate and frame heat exchanger is a new type of high-efficiency heat exchange equipment that absorbs the advantages of detachable plate heat exchanger and makes up for the shortcomings of tube heat exchanger. The gasket is completely eliminated on the upper side, and can be used in medium pressure and medium temperature applications. It retains the full counter current heat transfer characteristics of the detachable heat exchanger, which is 3 to 5 times more efficient than traditional shell and tube heat exchanger. According to the requirements of the application, the plate and frame type is divided into three types, which are non-detachable and can be installed on one side Removable, removable on both sides.
Plate and shell heat exchanger can be divided into plate and tube bundles and shells. Most plate bundles are equivalent to tube and shell tube bundles. Each of the plate bundle elements is two cold-formed (or explosively formed) metal strips. The plates are welded together in pairs at the contact points to form a flat tube containing multiple flat runners. In the heat exchanger, these flat plate and tube flow channels constitute the plate side of the plate and shell heat exchanger, which is equivalent to the tube side of the tube and shell heat exchanger, and each plate bundle element is equivalent to a tube. Many tubes of varying widths are arranged in a certain order. In order to maintain the space between the plates and tubes, metal bars are inserted at both ends of the adjacent plates and tubes and welded to the plates and tubes. The two ends of the tube and tube form a tube sheet, so that many tube and tube are firmly connected together to form a tube and tube bundle. The end of the tube and tube bundle presents several flat flow channels. The plate spacing in the middle of the plate bundle is maintained by the convexity on the plate bundle element. The tube and tube bundle is assembled in the casing, and the sliding expansion between the casing and the casing is used to eliminate the difference in longitudinal expansion.
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