Method for manufacturing a tube sheet and heat exchanger assembly for a pool reactor or pool condenser; corresponding tube sheet and heat exchanger assembly

摘要

The present application relates to a method of manufacturing a tube sheet (7) and heat exchanger assembly for a pool reactor or pool condenser for use in the production of urea from ammonia and carbon dioxide, wherein the method comprises manufacturing of the tube sheet (7) from a carbon steel material grade and providing said tube sheet (7) with corrosion protective layers (8, 9) of an austenitic-ferritic duplex stainless steel grade, wherein the heat exchanger comprises at least one U-shaped tube (13) of an austenitic-ferritic duplex stainless steel grade, the method further comprises inserting at least two sleeves (11) of an austenitic-ferritic duplex stainless steel grade through the tube sheet (7) such that both ends of the sleeve (11) extend in a direction away from the tube sheet (7), the method further comprises connecting the sleeves (11), at least the opposing ends thereof, to at least the protective layers (8,9) of the tube sheet (7) and finally, connecting both ends of the at least one U-shaped tube (13) to the respective sleeves (11).

主权项

1. Method for manufacturing a tube sheet and heat exchanger assembly for a shell and tube type heat exchanger, for use in an apparatus for the production of urea from ammonia and carbon dioxide, wherein the method comprises:
manufacturing the tube sheet from a carbon steel material grade and providing said tube sheet, on a shell side and a tube side thereof, with a corrosion protective layer of an austenitic-ferritic duplex stainless steel grade, wherein the heat exchanger comprises at least one U-shaped tube of an austenitic-ferritic duplex stainless steel grade; inserting at least two sleeves of an austenitic-ferritic duplex stainless steel grade through the tube sheet such that both ends of the sleeve extend in a direction away from the tube sheet; connecting the sleeves, at least the opposing ends thereof, to at least the protective layers of the tube sheet; welding both ends of the at least one U-shaped tube to the respective ends of the sleeves extending from the shell side of the tube sheet.