【Ten Years of Great Development in Chemical Processing Equipment】Large-Diameter Hydrocracking Shell-Removing High-Pressure Heat Exchangers from 1961 to 2021

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This post was last edited by Desert Fish on 2022-11-10 at 16:47. Witness the decade-long development of chemical processing equipment; praise the prosperity and strength of modern China. Replies are rewarded – discussions are welcome. ------------------------------------------- In August 2021, five shell-type high-and-low pressure heat exchangers for the 3.7 million tons per year hydrocracking unit in PetroChina’s Guangdong petrochemical integration project, developed by Lansi Heavy Equipment Petrochemical Company, were completed and delivered. The tube sheet of this product is made of ultra-thick-walled vanadium-added steel (with a shell wall thickness of 254 mm), with Alloy 625 welded on the inner surface; the tube plate is made of vanadium-added steel forgings with Alloy 625 welded on them ； 2 large nozzles with a diameter of φ1070 mm are welded to the cylinder body (the inner 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, are carried out after the overall heat treatment of the tube box; this is the first time such operations have been performed by Lanshi Heavy Equipment Installation. During the development process, the technical and production departments worked closely with the manufacturing workshops to gather information from various sources, and conducted in-depth research on relevant domestic and international technologies ； Through the discussion and evaluation of manufacturing plans as well as multiple technical briefings, the manufacturing process was optimized, enabling the resolution of technical challenges such as surfacing of special materials, prevention of deformation in heat exchange tube holes and sealing surfaces, control of tube end welding and expansion fitting quality, and high-pressure sealing of large-diameter flanges on the shell side and tube sheets. The successful development of this product has filled the gap in Lansi Heavy Equipment’s manufacturing technology for large-diameter shell-and-tube high-low pressure heat exchangers.