RU1775593C - Heat-insulated panel - Google Patents

Abstract

SUMMARY OF THE INVENTION: a panel consists of a supporting structure 1, a heat-insulating layer 4, a refractory layer 5 fixed with pins 2 welded to the supporting structure 1 and branched at the free end. At the branched ends, compensating tubes 3 of plastic material are worn. 1 silt

Description

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The invention relates to smelting electric furnaces.

Two-layer thermal insulation is known, including a layer of fibrous material, refractory blocks with T-grooves and metal pendants. The disadvantage of such thermal insulation is the great complexity of manufacturing refractory blocks and the non-integrity of the layer of them.

A heat-resistant structural element of heat engineering systems is known, consisting of two insulating and one monolithic refractory layers, which are attached to the supporting structure using welded pins, which are bifurcated at the free ends, which ensures the fastening of both insulating layers. A device is known for attaching a multilayer lining to a furnace casing, comprising rods attached to the furnace skin and whisker rods welded to the main rods, which provides fastening of the insulating and several refractory layers. These structures have one and the same drawback, since due to different linear thermal expansions of the supporting metal structure and the refractory layer, the latter is cracked and destroyed.

An object of the invention is to increase the service life of a thermally insulated panel by eliminating cracking of the refractory layer.

The drawing shows a panel section.

The panel consists of a metal structure 1 to which pins 2 with branched ends are welded onto which plastic tubes 3 are mounted, for example, of polyvinyl chloride. The metal structure is lined with a thermal insulation layer 4 and a monolithic refractory layer 5, which are held by pins 2.

The device operates as follows,

A monolithic refractory layer of the concrete of the panel is located inside the melting space of the electric furnace and encloses compensation tubes and pins of the panel from it. After ignition of the electric furnace, the layer of refractory concrete begins to expand. Metal pins expand as they heat up. Due to the difference in the linear expansion coefficients of the refractory concrete and the metal supporting structure of the panel, expansion tubes made of plate material are displaced from the space between the junction of the pins and the refractory concrete at the beginning of heating and are redistributed closer to the base of the pins. At higher temperatures, the expansion tubes burn out, but when they burn out, a gap forms between the branched part of the pins and the refractory concrete. This gap ensures the operability of the thermally insulated panel without cracking, since this gap subsequently plays the role of a compensator for linear expansion of the metal (pin) and concrete.

The use of the proposed panels will increase the productivity of the electric furnace by reducing heat losses, as well as reducing downtime associated with stops of the electric furnace to replace failed panels.

Claims (1)

The claims A heat-insulated panel containing insulating and refractory layers fixed to the metal supporting structure of the panel using pins with branches at the ends, so that in order to increase the service life of the insulated panel by preventing cracking of the refractory layer, it is equipped with compensating tubes of plastic material located on the branching of the pins, and the branches of the pins are located in the refractory layer from the boundary with the insulated layer.