F - Mech Eng,Light,Heat,Weapons – 28 – D
Patent
F - Mech Eng,Light,Heat,Weapons
28
D
257/15
F28D 7/00 (2006.01) C01C 1/04 (2006.01) F28D 7/06 (2006.01) F28F 9/02 (2006.01) F28F 19/00 (2006.01) F28F 21/08 (2006.01)
Patent
CA 1151149
ABSTRACT OF THE DISCLOSURE Apparatus for heat exchange between ammonia converter effluent recycle gas and water, has heat exchanger tubes carrying the recycle gas and seal-welded into a clad tubesheet which partitions the device into a pressure-bearing channel and a heat exchanger chamber. An inlet bucket admits the hot recycle gas to the tubesheet and is cooled by surrounding cooled recycle gas. The heat exchanger tubes (10) are of ferritic steel and are welded to the rear side (25) of tubesheet (4). Each tubesheet hole (23) in the hot gas inlet area has a cladding (24) of nitriding-resistant material. A protective sleeve (37) of nitriding-resistant material is inserted as nitriding-resistant cladding (24) into the tubesheet hole (23). The sleeve has a smaller outside diameter than the tubesheet hole, and the annular space between wall of the tubesheet hole and protective sleeve (37) is filled with thermal insulation(38).
379650
Brieke Hans-Gunther
Marsch Hans-Dieter
Fetherstonhaugh & Co.
Uhde G.m.b.h.
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