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Furnace insulation

A furnace and thermal insulation technology used in furnace components, furnace heating elements, electric furnace heating, etc.

Active Publication Date: 2007-08-15
SANDVIK INTELLECTUAL PROPERTY AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] A serious problem caused by the shrinkage of the insulation is that, as mentioned earlier, the resistive element tends to pull apart due to its fastening on the inner surface of the insulation

Method used

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  • Furnace insulation
  • Furnace insulation
  • Furnace insulation

Examples

Experimental program
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Embodiment Construction

[0019] These furnaces show SMU type furnaces, but they could also be adapted for SHC type furnaces.

[0020] FIG. 1 shows a furnace 1 comprising a furnace insulation made up of fiber modules 2 , 3 . The fiber modules 2 , 3 are formed as semi-cylindrical elements, one of which is shown in FIG. 2 . At least two semi-cylindrical elements 2, 3 are arranged against each other so as to form a cylinder whose inner space 4 constitutes the furnace space.

[0021] In FIGS. 2-5 only one inner fiber module is shown, which is intended to be placed against another corresponding fiber module to form a cylinder, as shown in FIG. 1 . Fiber modules in the form of otherwise semi-cylindrical elements are arranged on the cylinder in order to obtain a furnace comprising two mutually concentric layers.

[0022] The insulation is generally composed of alumina and silica.

[0023] The furnace comprises a resistive element 5 arranged against the inner surface 11 of the cylinder and / or fastened there...

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PUM

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Abstract

Furnace insulation comprising fibre modules in the form of at least two cylinder segments (2, 3; 7, 8) that are placed against one another so as to form a cylinder whose internal volume constitutes the furnace space and that are adapted to allow an electrical resistance element (5) to lie against and be fastened in the inner surface (4) of the cylinder. The present invention is characterized in that the inner part of the cylinder includes one or more radially extending or generally radially extending openings (12; 14).

Description

technical field [0001] The invention relates to furnace insulation for furnaces heated by means of electrical resistance elements. Background technique [0002] In the case of furnaces heated to very high temperatures, high demands are placed on the materials used to insulate the space heated in the furnace. Because the insulation surrounds the space that is heated in the furnace, the insulation also becomes very hot. [0003] The temperature of an electrically heated furnace of a given type reaches 1700°C in a few hours under normal conditions. The insulating material used consists, for example, of insulating fibers or high-grade bricks. [0004] A known problem with the technology employed in such furnaces is that many known materials are not capable of withstanding these high temperature stresses for the period of their effective use. These known materials typically shrink at high temperatures, causing sealing problems in those furnaces in which they are used. [0005...

Claims

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Application Information

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IPC IPC(8): F27D11/02F27D1/00F27D
CPCF27D1/0023F27D1/0006F27D1/0009F27D1/0036F27D1/00F27D11/02F27B5/08H05B3/66
Inventor 拉尔斯·G·约翰松拉尔斯-亨利克·埃克隆德
Owner SANDVIK INTELLECTUAL PROPERTY AB