Furnaces – Refuse incinerator – Rotary drum
Patent
1999-09-16
2000-12-26
Ferensic, Denise L.
Furnaces
Refuse incinerator
Rotary drum
110224, 110226, 110227, 110228, 432115, 34182, F23G 504, F26B 1112
Patent
active
061642207
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a device for the combustion of granular material, for example wood flour pellets, chippings and the like, comprising a rotary solid fuel burner, air inlet to the burner and at least one conduit for feeding in fuel and outlet for combustion gases to a boiler section for heat transfer to water-cooled surfaces for example,
PRIOR ART
A device of the type specified above is known by way of my previous Swedish Patent 450 734.
BRIEF DESCRIPTION OF THE INVENTION
The aim of the invention is to provide a device of the type defined in the preamble, which is based on the same basic concept as the device according to my previous patent, which makes use of advantages of this earlier device but which includes essential improvements. Thus certain sealing problems in the case of the previous device have been eliminated in the new device, at the same time as the new device has become simpler to manufacture. These and other advantages can be achieved therein that the invention is characterized by what is specified in the appending claims.
Further features and aspects of the invention are apparent from the following description of a preferred embodiment.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following description of a preferred embodiment, reference will be made to the accompanying drawings, of which
FIG. 1 shows partly diagrammatically a longitudinal section through the device according to a first embodiment,
FIG. 2 represents a view along the line II--II in FIG. 1,
FIG. 3 shows a section of the device with certain sealing elements included in the device, on a larger scale,
FIG. 4 represents a view along IV--IV in FIG. 3 and
FIG. 5 shows a longitudinal section through the device according to a further improved version of the invention.
DESCRIPTION OF PREFERRED EMBODIMENT
The solid fuel burner shown has the form of a drum, which has been generally designated 1 in FIG. 1 and FIG. 2. According to the embodiment, the drum 1 is circular-cylindrical and rotatable around a slightly inclined axis of rotation 2. The burner/drum 1 is positioned in connection to a heating boiler, which is not shown, and has at its front end an opening 3 for combustion gases. The rear end wall of the drum 1, like the main part of its cylindrical section, is double-walled. Located in the cylindrical double-walled part is an inner wall 4 and an outer wall 5 at a distance from the former. The space between these two walls has been designated 6. In a corresponding manner, the end wall has an inner wall 7, an outer wall 8 and a space 9 in between. The inner walls 4 and 7 are perforated by through holes 10 and 11 respectively. The area which is defined by the drum's double-walled section is here termed the main or primary combustion chamber 13, while the front, single-walled section of the drum is termed the after- or secondary combustion chamber 14. However, no restrictive significance shall be placed on these designations. The holes in the inner cylindrical wall 4 are disposed more closely in the rear part of the primary combustion chamber and distributed somewhat more sparsely in the front part. However, at the very front of the primary combustion chamber is a series of holes which are more closely distributed.
The space 6 between the cylindrical inner and outer walls 4, 5 is separated by longitudinal, radially aligned, lamella-shaped partition walls 16a into an equivalent number of longitudinal ducts 17a, which therefore have the shape of cylindrical segments. From a feed pipe 18 for the fuel an equally large number of lamella-shaped partition walls 16b extends out to the first-mentioned lamella-shaped partition walls 16a in the space 9 between the rear end walls 7 and 8, so that ducts 17b with the shape of a sector of a circle are formed between the partition walls 16b arranged like spokes in a wheel. The partition walls 16a and 16b pass into one another, as shown in FIG. 2, so that each duct 17b with the shape of a sector of a circle communicates with a longitudinal duct 17a, but only with one and
REFERENCES:
patent: 1583436 (1926-05-01), Atkinson
patent: 3380407 (1968-04-01), Nilsson
patent: 3433186 (1969-03-01), Koecher
patent: 3513788 (1970-05-01), Ostrin
patent: 4377116 (1983-03-01), Satake
patent: 4470358 (1984-09-01), Prochnow
patent: 4632042 (1986-12-01), Chang
patent: 5145362 (1992-09-01), Obermueller
patent: 5227026 (1993-07-01), Hogan
patent: 5904105 (1999-05-01), Pappinen
patent: 5927970 (1999-07-01), Pate et al.
Ferensic Denise L.
Reinhart Ken
Swedish Bioburner System Aktiebolag
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