US 12,298,085 B2
Heat exchanger for cooling cracked gas
Carsten Birk, Glienicke (DE); Andreeas Förster, Berlin (DE); and Michael Vogt, Dreetz (DE)
Assigned to BORSIG GMBH, Berlin (DE)
Filed by Borsig GmbH, Berlin (DE)
Filed on Jul. 18, 2022, as Appl. No. 17/866,648.
Claims priority of application No. 10 2021 003 955.6 (DE), filed on Jul. 23, 2021.
Prior Publication US 2023/0025071 A1, Jan. 26, 2023
Int. Cl. F28D 7/16 (2006.01); B23K 9/00 (2006.01); B23K 9/035 (2006.01); B23K 9/173 (2006.01); B23K 37/02 (2006.01); B23K 37/04 (2006.01); F28F 9/02 (2006.01)
CPC F28D 7/16 (2013.01) [B23K 9/0026 (2013.01); B23K 9/0358 (2013.01); B23K 9/173 (2013.01); B23K 37/02 (2013.01); B23K 37/0435 (2013.01); F28F 9/0246 (2013.01); F28F 2275/06 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A heat exchanger for cooling cracked gas, the heat exchanger comprising:
a cooled tube configured as a double tube comprising a cooled inner tube and a jacket tube, the cooled inner tube being enclosed by the jacket tube at a radial distance to form a tube intermediate space, through which a cooling medium flows;
an uncooled tube;
a tube connection between the uncooled tube and the cooled tube, the tube connection comprising:
a water chamber having a water chamber end face and a water chamber bottom end face;
a gas inlet header connected to the uncooled tube, the gas inlet header having a forked cross section and comprising a tube inner part and a tube outer part, defining a cooling intermediate space therebetween, and an insulating layer of a heat-insulating material in the cooling intermediate space, wherein the tube outer part is connected via the water chamber to the jacket tube, with the tube outer part connected to the water chamber end face and the tube inner part facing the water chamber bottom end face at an axial distance therefrom; and
a ring configured as a weld pool backing ring arranged between an end face of the cooling intermediate space and the water chamber bottom end face and inserted into the insulating layer of the cooling intermediate space in a mounted turn-out or groove in the insulating layer on the end face of the cooling intermediate space, wherein the weld pool backing ring is in contact with a tubular inner surface of the tube outer part, wherein the insulating layer with the weld pool backing ring provide an overhang of 0.3 mm to 1.3 mm over a welded edge of the gas inlet header.