Furnaces – Refuse incinerator – Refuse suspended in or supported by a fluid medium
Patent
1998-03-23
2000-05-09
Yeung, James C.
Furnaces
Refuse incinerator
Refuse suspended in or supported by a fluid medium
110297, 110348, 122 4D, 422139, 422143, 422145, F23G 500, F23G 700, B01J 818
Patent
active
060588578
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a fluidized bed incinerator wherein municipal solid waste, industrial waste, and the like is introduced into a fluid medium which is in a fluid state, and the waste is heated and incinerated.
BACKGROUND ART
As shown in FIG. 10, a conventional fluidized bed waste incinerator comprises: a combustion chamber 2 and a freeboard space 3 formed in a main furnace unit 1; a waste inlet 4 formed in the front wall 1a of the main furnace unit 1; an ash discharge outlet 6 formed in the rear base portion of the main furnace unit 1; a discharging device 5 provided at this ash discharge outlet 6, which discharges incinerated ash and incombustible material whilst leaving the fluid medium S; and a plurality of dispersive air pipes 7 arranged mutually in parallel passing through the lower portion of the combustion chamber in a horizontal direction.
In the composition described above, the heated fluid medium S is caused to become fluid by means of dispersive air injected into the fluid medium S in the furnace main unit 1 from dispersive air pipes 7. Waste to be incinerated is introduced via the waste inlet 4 and mixes into the fluid medium S, and the waste is heated, fluidized and then combusts in a combustion zone in the upper portion of the combustion chamber 2. Incinerated ash is carried to the ash discharge outlet 6 by the downward movement of the fluid medium S, and then discharged.
The dispersive air pipes 7 pass through side walls 1b of the main furnace unit 1 transversely in a horizontal direction. Adjacent dispersive air pipes 7 are spaced to have a gap of approximately 100-150 mm between each other. There are cases where large items of incombustible material or linear items of incombustible material, such as wire or the like, which are larger than this gap, may be present in the waste introduced into the incinerator, or large lumps of clinker may form during incineration. In these cases, there arises a problem that such items will accumulate above the dispersive air pipes 7, due to the narrow gaps between the dispersive air pipes, and will not be discharged from the ash discharge outlet 6, thereby rendering the incinerator inoperable.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide a fluidized bed incinerator whereby large items of incombustible material, linear items of incombustible material, large lumps of clinker and the like can be discharged smoothly.
In order to achieve this object, the fluidized bed incinerator according to the present invention is characterized in that it comprises an ash discharge outlet formed in the base portion of a furnace main unit; a plurality of dispersive air pipes for combustion containing a large number of dispersive air holes formed therein, which project respectively in a cantilever fashion from mutually opposing side walls in an oblique downward direction at the lower portion of a combustion zone of the furnace main unit; and an incombustible material discharge space formed between the ends of these dispersive air pipes for combustion.
Furthermore, the invention is also characterized in that it comprises an ash discharge outlet formed in the base portion of a furnace main unit; a plurality of dispersive air pipes for combustion containing a large number of dispersive air holes formed therein, which project in a cantilever fashion from a side wall in an oblique downward direction at the lower portion of a combustion zone of the furnace main unit; and an incombustible material discharge space formed between the ends of these dispersive air pipes for combustion and a side wall.
According to the composition described above, since solid items of incombustible material and linear items of incombustible material present in waste for incineration and introduced into the fluid medium, or large lumps of clinker formed in the fluid medium, are guided in a downward direction on the inclined dispersive air pipes for combustion and are discharged from the incombustible material discharge space to the ash
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Aoki Norihiro
Matsui Takeshi
Miura Yoshimasa
Nakai Seiichi
Okada Yusuke
Ciric Ljiljana V.
Hitachi Zosen Corporation
Yeung James C.
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