The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 28, 1977
Filed:
Mar. 10, 1976
Frank J Smith, Philadelphia, PA (US);
Other;
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.