Furnaces – Including means to feed solid fuel
Patent
1996-11-26
1998-06-30
Lazarus, Ira S.
Furnaces
Including means to feed solid fuel
110248, 110256, 110291, F23K 300
Patent
active
057718199
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention is directed to an incinerating furnace which utilizes hearth mineral particles, which move or flow without being fluidized, as a hearth bed upon which a combustible material is decomposed.
BACKGROUND OF THE INVENTION
Air intakes of prior art incinerating furnaces, such as illustrated in Japanese Laid Open Hei No. 4-15404 (Kokai No. 92-15404) or Japanese Patent Application Specification Hei 5-242170 (No. 93-242170), which have the same inventor as the present application, generally draw air freely without any special restrictions on gas flow.
The present invention provides an incinerating furnace which restrains the upward backflow of combustion gas into a materials inlet portion of the furnace, supplies combustion air to the combustion chamber in a sufficiently large amount and at a high temperature and vents gas from the materials inlet portion to the combustion chamber and thereby avoids the problems associated with the prior art incinerating furnaces.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a hearth particle bed incinerating furnace comprising an inlet portion containing a hopper for materials to be incinerated, means for restraining the upward backflow of combustion gas comprising the hopper, at least one baffle, a combustion air inlet and a sidewall member provided underneath the hopper, a furnace sidewall which extends around and underneath the sidewall member, a hearth particle inlet which comprises a chamber formed between the furnace sidewall and a furnace outerwall, an inclined channel member attached to the furnace outerwall and provided underneath the hearth particle inlet, a sloped hearth bed formed on the inclined channel member with the sloped hearth bed being made up of a layer of hearth particles which flow down the inclined channel member without being fluidized and at an angle approximately equal to the angle of repose of the hearth particles, the combustion chamber comprising the sloped hearth bed, a lower portion of the furnace outerwall and a lower portion of the furnace sidewall, a furnace outlet provided underneath the combustion chamber for discharging a combustion mixture or burnt residues and hearth particles from the combustion chamber, means for removing combustion gas provided at an upper portion of the combustion chamber, means for removing combustion air through the combustion air outlet, means for introducing the combustion air into the lower hearth bed for combustion, a movable plane member provided underneath the furnace outlet for removing the combustion mixture and means for regulating the discharge of the combustion mixture so that the combustion mixture deposits on the movable plane member at an angle approximately equal to the angle of repose of the hearth particles.
In one embodiment of the present invention, the combustion air is mixed with a portion of the combustion exhaust gas to form a mixed gas which is then introduced into the lower hearth bed for combustion. In another embodiment of the present invention, the combustion air is heated through heat exchange with the combustion exhaust gas before being introduced into the hearth particle bed for combustion. In yet another embodiment of the present invention, the combustion air is heated through heat exchange with the combustion exhaust gas and then mixed with a portion of the combustion exhaust gas to form a mixed gas which is then introduced into the hearth particle bed for combustion.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a partial sectional view of an incinerating furnace according to a first embodiment of the present invention.
FIG. 2 illustrates an embodiment of a means for preventing upward backflow of combustion gas according to the present invention.
FIG. 3 is a schematic side view of the inclined channel member of the present invention.
FIG. 4 is a schematic side view of the inclined channel member according to a second embodiment of the present invention.
FIG. 5 is a partial sectional view illustrating an
REFERENCES:
patent: 3561378 (1971-02-01), Fabry
patent: 5081940 (1992-01-01), Motomura et al.
patent: 5195449 (1993-03-01), Michimae
patent: 5241916 (1993-09-01), Martin
Lam Nhat-Hang H.
Lazarus Ira S.
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