F - Mech Eng,Light,Heat,Weapons – 23 – J
Patent
F - Mech Eng,Light,Heat,Weapons
23
J
122/132, 257/19
F23J 3/02 (2006.01) F22D 1/02 (2006.01) F22D 1/06 (2006.01) F28D 21/00 (2006.01)
Patent
CA 1067484
Abstract of the Disclosure An economizer for extracting heat energy from low temper- ature flue gases while simultaneously removing therefrom contam- inants consisting chiefly of oxides and oxygen acids of sulfur. The economizer includes a plurality of heat exchange tube assem- blies, each of which comprises concentrically spaced inner and outer tubes of different materials. The spaces between the con- centric tubes are filled with graphite which remains in heat conductive contact with the inner and outer tubes while accom- modating their differential rates of thermal expansion and contrac- tion upon heating and cooling. In the preferred form of the invention, the outer tube is made of low expansion borosilicate glass, while the inner tube is of copper. The flue gases flow transversely to the tube assemblies while water is rapidly cir- culated through the copper tubes in order to absorb efficiently the heat conducted sequentially through the glass, graphite and the copper materials.
273515
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