【Haichuan Explores the World】What is a shell-exchange high-low pressure heat exchanger?

The shell-and-tube heat exchanger consists of a cylindrical shell, a base, a heat exchange tube bundle, and guide plates. The shell is divided into an upper section and a lower section, with an enamel coating on its inner wall. Upper and lower partitions separate the shell longitudinally; the heat exchange tube bundle is arranged in a vertical inverted-U shape. Tube sheets divide the shell horizontally into an upper tube box and a lower tube box. The flow directions of the heat transfer fluid and the medium to be heated are opposite to each other, and horizontal guide plates are arranged longitudinally within the upper tube box. This heat exchanger has a heat exchange efficiency three times higher than that of mixed-flow or co-current heat exchangers; it is easy to clean and remove scale from, occupies less space, and operates safely and reliably. It is suitable for various industrial and domestic heat exchange applications.

These products are large-diameter shell-and-tube high-low pressure heat exchangers, utilizing patented technology from CNPC East China Design Institute； The overall material of the tube sheet is ultra-thick-walled vanadium-added steel (with a shell wall thickness of 254 mm), with Alloy 625 welded on the inner surface; the material of the tube plate is a vanadium-added steel forging with Alloy 625 welded on it ； Two large nozzles with a diameter of φ1070 mm are welded to the cylinder (the internal diameter of the equipment is 2190 mm) ； The welding of Alloy825 heat exchange tubes to the tube sheet ends, as well as the expansion fitting process, must be carried out after the overall heat treatment of the tube box; this is the first time such fabrication has been undertaken by Lanshi Heavy Equipment Installation.