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:
Apr. 29, 1986
Filed:
Sep. 25, 1984
William G Urbani, Stockton, CA (US);
Other;
Abstract
A dirty water heat exchanger keeps solids from settling out while passing through the heat exchanger and includes a cylindrical furnace duct, connected at a first end to a conventional burner, having a spiral liquid heating duct along which the dirty water passes from its first end to its second end. The second end of the furnace duct is open. An exhaust tube surrounds the furnace duct and provides an annular exhaust gap for the hot gases to flow back over the outer surface of the spiral liquid heating duct. The outer end of the exhaust tube is closed to redirect hot gases into the exhaust gap. Spiral flighting along the exhaust gap spirals the exhaust gas to keep the hot gases collecting along the top of the heat exchanger. The gases pass out of the exhaust gap through a flume at the first exhaust tube end. The furnace duct and the exhaust tube are connected together at at most one axial position to accommodate different amounts of axial expansion. The heat exchanger is supported by an expansion mount at the second end of the exhaust tube and by a stationary mount at the first end of the furnace tube.