Liquid heaters and vaporizers – Feed heaters – Offtake flue
Patent
1976-03-10
1977-06-28
Sprague, Kenneth W.
Liquid heaters and vaporizers
Feed heaters
Offtake flue
122392, 122DIG13, F23J 302, F22D 102
Patent
active
040318621
ABSTRACT:
An economizer for extracting heat energy from low temperature flue gases while simultaneously removing therefrom contaminates consisting chiefly of oxides and oxygen acids of sulfur. The economizer includes a plurality of heat exchange tube assemblies, each of which comprises concentrically spaced inner and outer tubes of different materials. The spaces between the concentric tubes are filled with graphite which remains in heat conductive contact with the inner and outer tubes while accommodating their differential rates of thermal expansion and contraction 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 circulated through the copper tubes in order to absorb efficiently the heat conducted sequentially through the glass, graphite and the copper materials.
REFERENCES:
patent: 2551137 (1951-05-01), Kennedy
patent: 2795213 (1957-06-01), Cooper
patent: 2797669 (1957-07-01), Nalven
patent: 3768447 (1973-10-01), Kallstrand
Sprague Kenneth W.
Weber Richard D.
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