Furnaces – Refuse incinerator – With means for advancing or handling refuse or residue
Patent
1995-07-17
1998-06-23
Bennett, Henry A.
Furnaces
Refuse incinerator
With means for advancing or handling refuse or residue
110165R, 110266, 110257, F23G 500
Patent
active
057690090
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention is directed to a method of removing dioxin from a combustion residue and an apparatus for performing the method.
BACKGROUND OF THE INVENTION
Although there are many known processes for removing dioxin from a combustion gas, there is no known industrial method for removing dioxin from a combustion residue generated in a hearth particle bed incinerating furnace of the type disclosed in Japanese Patent Laid-Open Hei 4-15404 (JP A 92-15404).
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an industrially suitable method and apparatus for removing dioxin from the combustion residue produced in a hearth particle bed incinerating furnace.
It is a further object of the present invention to provide a hearth particle bed incinerating furnace which generates a combustion residue containing reduced amounts of dioxin and possesses a combustion chamber having a wall of a continuous slope which detains the substance to be incinerated.
These and other objects of the present invention are accomplished by providing a method for treating a combustion residue in which a mixture of a combustion residue and hearth particles are maintained at a temperature of 400.degree. C. or higher for at least 30 minutes in an incinerating furnace to remove dioxin from the combustion residue.
The present invention is also directed to a method of treating a combustion residue in which a combustion gas having a temperature of at least 400.degree. C. is supplied to a mixture of a combustion residue and hearth particles for at least 30 minutes to remove dioxin from the combustion residue.
A further aspect of the present invention is directed to a hearth particle bed incinerating furnace comprising a combustion chamber having an inclined surface on which a hearth particle bed is disposed, means for introducing hearth particles onto the inclined surface, air inlets provided at a second inclined surface for promoting incineration of a waste material, a fan for extracting combustion gas from the combustion chamber at a lower position of a hearth particle bed and supplying the high temperature combustion gas to a mixture of hearth particles and combustion residue at a temperature of at least 400.degree. C. and a removal means provided beneath and separate from the extraction point of the combustion gas for removing the mixture of the combustion residue and hearth particles and controlling the residence time of the mixture in the combustion chamber to at least 30 minutes.
In another aspect of the present invention, the removal means comprises a first conveyor means which receives a mixture of the hearth particles and the combustion residue having an angle of repose on the first conveyor means equal to that of the hearth particles and a second conveyor means which receives hearth particles containing substantially no combustion residue, wherein each conveyor is operated independently of each other.
In a still further aspect of the present invention, the removal means comprises two parallel conveyor means which partially overlap, with one conveyor means being separated from the outlet of the combustion chamber and receiving the mixture of the hearth particles and combustion residue falling from a front half area of the outlet and carrying it laterally to a receiving tank and a second conveyor means is disposed separate from the outlet and receives hearth particles containing substantially no combustion residue exiting from the other half area of the outlet and carries it laterally in a different direction.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a partial cross-sectional view of an incinerating furnace containing a hearth particle bed according to the present invention.
FIG. 2 is a partial sectional view illustrating the arrangement of air inlet apertures on a channel member of the present invention.
FIG. 3 is a partial sectional view of a channel member according to the present invention.
FIG. 4 is a partial sectional view of a hearth particle bed incinerating furnac
REFERENCES:
patent: 3302598 (1967-02-01), Godel
patent: 3861331 (1975-01-01), Saitoh et al.
patent: 4991519 (1991-02-01), Saitoh
patent: 5078065 (1992-01-01), Tsunemi et al.
patent: 5191844 (1993-03-01), Scheel
Bennett Henry A.
Tinker Susanne C.
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