Furnaces – Combined – With boiler
Patent
1982-03-08
1983-10-11
Favors, Edward G.
Furnaces
Combined
With boiler
110246, 110294, 126181, F23B 700
Patent
active
044085478
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a heating boiler intended for solid fuel and comprising a furnace and a feeding means to the purpose of feeding fuel onto the grate in the furnace.
In prior art heating boilers using solid fuel such as peat or chips are known in which the feeding of fuel into the boiler furnace is with the aid of mechanical conveyors. The problem in using said fuels is however that they often contain a considerable amount of moisture, which retards the combustion. In some boilers, in an attempt to solve this problem, the fuel is dried with the aid of hot combustion gases conducted from the furnace. In that case the fuel feed ducts and the set of flue gas exhaust conduits have to be interconnected in a way which renders the boiler comparatively complex of its construction.
The object of the present invention is to provide a heating boiler in which moist fuel can be burned, even green chips if required, without necessity to perform any drying of the fuel prior to its introduction into the boiler furnace. The invention is based on constructing the grate in the furnace in a way by which is achieved sufficient boosting of the combustion reaction, and it is characterized in that the grate consists of a shell-like burning basket into which the fuel can be supplied and which can be set in rotary motion about its substantially horizontal axis. The rotating burning basket disperses the fuel over a wider area so that it is brought into the most efficient contact possible with the combustion air. By keeping the burning basket in constant motion, one prevents the accumulation of fuel on one spot, whereby further the starting of the combustion reaction is speeded up.
One embodiment of the heating boiler of the invention is characterized in that to the burning basket has been connected an arm parallelling the axis of the basket and connected over a gear wheel with the motor rotating the burning basket. It is to advantage in connection with this problem solution to shape said arm to be a hollow tube extending out from the boiler. In that case the mechanism rotating the burning basket constitutes no obstacle whatsoever to the feeding operation.
Another embodiment of the heating boiler of the invention is characterized in that the burning basket consists of net-like material. The advantage is then that the fuel, which comes in a granulate-resembling form, is caught in the net, which to a considerable extent prevents the sliding down of the fuel as the burning basket rotates. The net constitutes an ideal combustion base also in the respect that the fuel is all the time in complete unobstructed contact with the combustion air.
The invention may also be advantageously applied so that the burning basket is encircled by a housing having as its extension a cyclone fitted with a helical flue gas exhaust duct. The heating boiler may then be furnished with a duct through which the combustion air is blown into the housing, and the helical exhaust duct, where the combustion gases that are produced are set in rotary, accelerating motion, efficiently brings the combustion reaction to its completion and prevents ash from accumulating in the housing.
The invention is described in detail in the following with the aid of an example and with reference to the attached drawing, wherein:
FIG. 1 presents the rotating burning basket and the arm thereto attached with its gear wheel;
FIG. 2 shows, partly sectioned, the furnace of the heating boiler, provided with a burning basket as depicted in FIG. 1 and with a fuel dispensing apparatus; and
FIG. 3 shows the section along line III--III in FIG. 2.
In FIG. 1 has been depicted the rotating burning basket 1 constituting the grate of a heating boiler using mainly chips or milled peat, said burning basket comprising a cylindrical mantle 2 of metal netting, confined at both ends by a circular plate, or disk, 3. One of said disks has an aperture 4, to which has been affixed a horizontal, tubular arm 5. Close to the end of the arm has been mounted a gear wheel 6, by which the arm is connectab
REFERENCES:
patent: 2426348 (1947-08-01), Fulton et al.
patent: 2496156 (1950-01-01), Fulton
patent: 3368505 (1968-02-01), Harrison
patent: 3376833 (1968-04-01), Mutchler
patent: 3646898 (1972-03-01), Bauers
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