Heating – Work feeding – agitating – discharging or conveying... – Having distinct heat shield – conductor – director or...
Patent
1991-08-22
1993-11-02
Yuen, Henry C.
Heating
Work feeding, agitating, discharging or conveying...
Having distinct heat shield, conductor, director or...
432238, 110336, F27D 300
Patent
active
052579298
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method for thermal insulating of a furnace for high temperature, for example a glass melting furnace, and a furnace manufactured in accordance with this method.
In a glass melting furnace a temperature of approximately 1500.degree. C. is reached. Glass furnaces have usually consisted up to the present of a mortar laid brick wall which is lined on the inside with thermally insulating material. The brick wall serves not only as insulator but also as support frame for the insulating material. Such a wall has to be made on site for the user. It is not possible to manufacture this furnace in a factory and then transport it to the location of use. The furnaces are usually of a size such that there is space therein for various glass pots, in which the glass is melted. Such furnaces are expensive and have a limited output.
From U.S. Pat. Nos. 4,595,358 and 4,709,643 a method is known for thermal insulating of a furnace for high temperature, for example a glass furnace, comprising the steps of:
a. the arranging on the interior wall of the furnace shell of layers of insulating material,
b. the applying to these layers of ceramic fiber material, and
c. the arranging on the inward facing surface of said ceramic fiber material of a heat reflecting surface layer.
It is the object of the invention to provide a furnace that is light in construction, can be manufactured on factory premises and which, in view of its construction and weight, can be transported easily.
SUMMARY OF THE INVENTION
In accordance with the invention this is achieved by the features according to claim 1.
The furnace insulated in this way can be light because the furnace shell can be of sheet metal. Through the arrangement of the heat reflecting surface layer a heat reflection is obtained in the micro-structure of the ceramic fiber, while the body of the module of the ceramic fiber otherwise remains soft and preserves its thermal insulating value.
The heat reflecting surface layer can be arranged by applying a substance containing silicon, by then greatly heating the furnace and cooling it rapidly thereafter. Thus achieved is that only a surface layer in the micro-structure melts and becomes hard after cooling, while the rest of the fiber material remains soft and therefore preserves the thermal insulating transfer properties.
The reflecting surface layer is aplied by heating the furnace to approximately 1500.degree. C. and by then cooling it down to about 1250.degree. C. The silicon holding substance may for example be a sort of water-glass.
The heat reflecting layer is fire resistant.
The ceramic fiber material is not in itself self-supporting without steps being taken to achieve this. In accordance with the invention the fiber material is arranged on the side wall of a cylindrical furnace using the following steps:
a. fiber material is pressed and strapped up into vertical blocks of trapezium form section,
b. blocks formed as according to step a. are disposed abutting one another against the cylindrical inner wall such that the whole inner surface is covered, and
c. the strapping of the individual blocks is removed and the blocks allowed to expand.
Thus achieved is that the blocks of cylindrical material, after the removal of the strapping and expansion resulting from the opposing forces generated by the pressing, come to lie stiffly against one another and joins between the blocks which could cause thermal leakage are closed.
The furnace is preferably a cylinder open to the bottom which is placed loose on a base plate and whereby the cylinder and the base plate are insulated in the manner as described in the foregoing.
The open cylinder thus functions as a kind of hat which can easily be removed from the base plate. This yields the advantage that the glass pot can be taken very easily and quickly out of the furnace and placed therein by lifting the hat and setting it in inclined position.
The layers of insulating material are arranged overlapping to prevent thermal leakage.
As material for
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Cahiers d'Informations Techniques de la revue de Metallurgie, vol. 80, No. 3, Mar. 1983 (Paris, FR), M. Puillet et al.: "Caracterisation physico-chimique des materiaux refractaires fibreux" pp. 237-253, see page 240.
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