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US 2025/0052414 A1Published application
Tube sheet protection in a process gas waste heat boiler
AssigneeTopsoe A/S
InventorsLasse Joel Lowater, Søren Gyde Thomsen
Life of this patent
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Abstract
The invention relates to a process gas waste heat boiler (PGWHB) of the single-pass and straight-tube type and having thin flexible tube sheets being provided with a weld overlay or cladding, particularly process gas waste heat boilers for the recovery of heat from a process gas, in which the process gas is synthesis gas exiting a steam reforming unit.
Claims15
Process gas waste heat boiler (PGWHB) comprising:
- a shell within which a plurality of straight tubes are arranged, each of the straight tubes being connected at its one end with an inlet tube sheet and with an outlet tube sheet at its opposite end;
- in which the inlet tube sheet and the outlet tube sheet are provided with a plurality of holes adapted to cooperate with each of said straight tubes for respectively receiving and exiting a process gas, such as a synthesis gas,
- wherein each of the holes in the inlet tube sheet defines an inlet opening and each of the holes in the outlet tube sheet defines an outlet opening,
- wherein at least the inlet and outlet tube sheets are provided with a weld overlay or cladding at least at said inlet and outlet opening of each of the holes,
- and wherein the inlet and outlet tube sheets are thin flexible tube sheets made of low alloy steel and having a thickness including said weld overlay or cladding of 20-70 mm.
2 more elements
Dependencies are inferred from the claim text.