Furnaces – Combined – With boiler
Patent
1989-03-29
1990-12-11
Favors, Edward G.
Furnaces
Combined
With boiler
110190, 110235, 110300, 122 2, 122 4C, F23B 700
Patent
active
049762095
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to furnaces for incinerating waste material, which material has unpredictable burning characteristics, and may oxidize endothermically or exothermically.
BACKGROUND ART
Some organisations, such as hospitals, are compelled by regulation to dispose of their waste material by incineration. In order to reduce the cost, incurred due to the fuel consumption of the furnace, of incinerating the waste material, attempts have been made to recover and utilize the waste heat produced during the incineration process. The most cost-effective methods of recovery proposed thus far, involve systems using a waste heat recovery boiler, capable of raising steam for, example a central heating system, connected to a pyrolitic incinerator. Such systems must, however, satisfy the strict regulations concering air pollution. The systems must also be regularly loaded with waste material and regularly de-ashed, in order to prevent build-up, if the system is to operate efficiently. This necessitates constant supervision and maintenance, and although mechanisms for the automatic de-ashing of furnaces have been proposed, the mechanisms presently in use or disclosed in GB No. 1275304A (FABRY), which attempt to avoid any interruption of the incineration process, can be considerably complex.
THE INVENTION
A furnace according to the invention is characterised by a trap door situated at a lower part of the combustion chamber arranged to permit air for combustion to pass upwards past the door in the closed condition and to open for removing ash from the combustion chamber periodically when required.
The invention is also preferably provided with a means, such as a screw conveyor, for removing ash from below the trap door. The passage of air upwards past the trap door ensures that the door is cooled, that the combustion of waste material is promoted and that the door can be readily operated even after ash has accumulated upon it. The door may have additional apertures to assist air passage into the combustion chamber. Preferably the door is associated with a grating, conveniently at an end thereof, which may be downwardly inclined to the door or may be level, and blowing means arranged to blow through the grating and assist in maintaining ash fluidity and to help ash to accumulate preferably on top of the door.
DRAWINGS
FIG. 1 is a vertical section through a three-pass boiler/incinerator according to the invention,
FIG. 2 is a vertical section along line 2--2 in FIG. 1,
FIG. 3 is a horizontal section along line 3--3 in FIG. 2;
FIG. 4 is a horizontal section along line 4--4 in FIG. 2;
FIG. 5 is a vertical section of the incinerator of FIG. 1 to illustrate the overall configuration;
FIG. 6 is a transverse section of FIG. 5 showing three-pass boiler tube lay-out;
FIG. 7A is an enlarged, part section of a modified lower end of FIG. 1 showing in FIG. 7B a yet further enlarged side view of part of the grating in the lower end.
CONSTRUCTION BY REFERENCE TO DRAWINGS
With reference to the Figures a three-pass boiler or incinerator with a vertical combustion chamber forming the furnace is generally indicated at 2. The boiler contains a chamber 4 which is lined with refractory 6 and has a water jacket 8 with spaces 10 for boiler tubes 9 (FIGS. 5,6) and for air passages and has reversal chambers 11 to allow air to move from the chamber 4 down along the outside of the refractory lining past the boiler tubes and hence upwards again in the conventional arrangement of a three-pass boiler as shown by arrows A. In FIG. 6 a sector marked X provides for a downward flow past the boiler tubes 9 and sector Y for an upward flow leading to an induced draft fan 33 shown in FIG. 5. The boiler may be a wet back boiler with a header on top of the chamber for air emerging from sector Y.
At a lower chamber end a grating array 12 is provided which includes a step-wise arrangement of hollow, rectangular section grating tubes 14. The tubes 14 are spaced vertically and horizontally. Sequentially operable air blast nozzles 120 m
REFERENCES:
patent: 1813156 (1931-07-01), Gilchrist
patent: 2157993 (1939-05-01), Woodman
patent: 2698587 (1955-01-01), Knipe
patent: 2911926 (1959-11-01), Kocee
patent: 3104629 (1963-09-01), Crawford
patent: 3413936 (1968-12-01), Matthews
patent: 3526196 (1970-09-01), DeSeversky
patent: 3769921 (1973-11-01), McMullen
patent: 4235174 (1980-11-01), Spurrell
patent: 4454828 (1984-06-01), Zempel
patent: 4495872 (1985-01-01), Shigaki
patent: 4502397 (1985-03-01), Hochmuth
Carney Vincent L.
Erithglen Limited
Favors Edward G.
Ferensic Denise L.
LandOfFree
Furnaces for incinerating waste material does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Furnaces for incinerating waste material, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Furnaces for incinerating waste material will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-383309