F - Mech Eng,Light,Heat,Weapons – 28 – F
Patent
F - Mech Eng,Light,Heat,Weapons
28
F
F28F 21/04 (2006.01) F28F 9/02 (2006.01) F28F 19/00 (2006.01) F28F 19/02 (2006.01)
Patent
CA 2191379
A heat exchanger achieves a more uniform internal temperature gradient within its scctions during normal operation as well as subsequent to an unexpected power shutdown. Internal fouling of tubes containing the process gas and entrained solids is reduced. An external shell is utilized which is insulated on its inner surface and optionally provided with cooling medium flowing within the shell wall. A double bottom tube sheet enclosing a secondary cooling medium chamber is also provided. The top of the process gas tube is preferably enclosed within a shielded chamber to facilitate a thermal gradient proximate thereto. A ferrule is similarly affixed to the bottom of the process gas tube at the point where it passes through the double bottom tube sheet. Cooling medium flow is diverted and passed directly into the cooling chamber of the double bottom tube sheet. Cooling medium from the double bottom tube sheet is then vented to the top of the heat exchanger to a point adjacent the top tube sheet. A secondary blower for propulsion of the cooling medium is provided in line with the normal flow of cooling medium from the primary blower. Under unexpected shutdown conditions, the primary blower operation is discontinued and the secondary blower continues its propulsion of cooling medium through the double bottom tube sheet and the main cooling medium chamber.
Freitag Axel
Natarajan Cuddalore Padmanaban
Yamaji Haruhisa
American Schack Company Inc.
Borden Ladner Gervais Llp
Freitag Axel
Natarajan Cuddalore Padmanaban
Yamaji Haruhisa
LandOfFree
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