Furnaces – With exhaust gas treatment means – Afterburning means
Patent
1998-04-06
1999-06-29
Lazarus, Ira S.
Furnaces
With exhaust gas treatment means
Afterburning means
110210, 110245, 110251, 110259, 431170, F23B 500, F23D 2100
Patent
active
059153091
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a fluidized bed incinerator for incinerating municipal solid waste, industrial waste, and the like, by introducing it into a fluidized bed material.
BACKGROUND ART
In Japanese Patent Application No. 5-225269 (Japanese Patent Laid-Open Application No. 7-83424), the present inventors and others proposed a fluidized bed incinerator which resolves problems arising in the rapid combustion of material for incineration introduced into a fluidized bed material consisting of a fluid medium, such as silica or the like, and unburnt waste and combusted ash.
In this fluidized bed incinerator, a pair of partitioning walls extending from the side by the inlet for material for incineration to the side by the ash discharge outlet are provided on either side of the bed surface of a combustion chamber in a furnace main unit, such that the combustion chamber is divided into three in a lateral direction, thereby separating the fluid layer into a central fluid layer and right and left side fluid layers. Emission pipes for fluidizing air are provided respectively in the base section of each fluid layer and are composed such that, by controlling the speed of the dispersive air emitted from the emission pipes in each fluid layer, the fluidized bed material circulates fluidly in succession from the central fluid layer by the inlet towards the central fluid layer by the discharge outlet towards the side fluid layers by the discharge outlet .fwdarw. the side fluid layers by the inlet.
According to the composition described above, stable combustion is achieved, whereby the fluid speed of material for incineration introduced into the central fluid layer by the inlet is reduced, the material combusts slowly, and moreover, the generation of carbon monoxide and dioxin can be suppressed.
However, the following problems have been observed in the an aforementioned composition for a fluidized bed incinerator. walls are water-cooled partitioning walls comprising in-built water pipes, and therefore the thickness of the partitioning walls is increased, the bed surface of the central fluid layer becomes narrower and this bed surface area cannot be used effectively. Furthermore, the structure is complex and equipment costs increase. between the fluidized bed material and the height of the partitioning walls will change, making it difficult to achieve stable circulation of the fluidized bed material, and therefore requiring control of the layer height and fluid speed. inlet, in structural terms, the side fluid layers by the inlet have a narrow surface area and the outlet space at the top of the partitioning walls becomes narrow. Therefore, it is necessary to propel the fluidized bed material upwards at a high fluid speed in order that it is transmitted from the side fluid layers by the inlet to the central fluid layer by the inlet, and hence the fluid speed of the fluidized bed material cannot be reduced in this region. Consequently, there is a limit to the extent to which the fluid speed of the fluidized bed material in the central fluid layer can be reduced. the inlet are covered by low, arc-shaped ceiling partitions which guide the fluidized bed material, they do not receive heat radiated from combustion of pyrolyzed gases, or the like. Therefore, thermal efficiency declines and the temperature of the central fluid layer by the inlet and the central fluid layer by the outlet is reduced excessively.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide a fluidized bed incinerator wherein partitioning walls are eliminated, whilst at the same time low-speed circulation of fluidized bed material can be achieved, the bed surface is utilized effectively and material for incineration is combusted slowly, and furthermore, the fluid layers can be raised in temperature to beneficial effect.
In order to achieve this object, the waste incinerating apparatus according to the present invention is so arranged that in a fluidized bed incinerator, a fluid medium is introduced onto the
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Aoki Norihiro
Matsui Takeshi
Miura Yoshimasa
Nakai Seiichi
Okada Yusuke
Ciric Ljiljana V.
Hitachi Zosen Corporation
Lazarus Ira S.
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