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:
Jan. 21, 1992
Filed:
Dec. 20, 1990
Harry Ollila, Kauniainen, FI;
A. Ahlstrom Corporation, Karhula, FI;
Abstract
A method and apparatus are provided for effecting bidirectional feeding of particulate material, such as in the bidirectional feeding of fuel to a circulating fluidized bed combustor. A feeder has a housing with at least one inlet in the upper portion of the housing and a chain and flight (drag chain) conveyor disposed within the housing. An intermediate plate is disposed between the upper and lower runs of the chain and flight conveyor and cooperates with the flights in the upper run so that the upper run conveys solid material in a first direction along the intermediate plate. A bottom plate is disposed below the lower run and cooperates with the lower run flights to convey solid material in a second direction opposite the first direction. First and second outlets are provided for the solid material, the first outlet at one end of the housing, and the second outlet at the other end of the housing. At least one opening is disposed in the intermediate plate for allowing a portion of the solid material being conveyed to flow through the opening to the lower run of the conveyor. The size and/or of the opening is adjustable to control the proportion of solid material flowing down to the lower opening, the opening preferably being adjustable so that it has about 30-70% of the width of the intermediate plate.