SU372416A1 - CODE OF THE MARTENOV STEEL orATATHniU-iDUL: '^ E;: ii> &i); ^ - Google Patents

Description

The invention relates to the field of ferrous metallurgy, in particular to the arches of the open-hearth furnace.

Famous set of open-hearth furnace containing refractory brickwork and metal plates located between them.

The disadvantages of such a roof are the low thermal stability of the masonry and the large heat losses through the roof.

In order to eliminate these drawbacks, the metal plates of the proposed arch are installed with the release of their lower ends below the working surface of the arch, and the gaps between the ends of the plates protruding into the furnace space are filled with shotcrete.

FIG. 1 shows a set of open-hearth furnace; in fig. 2 - the same element of the arch.

The vault consists of: refractory bricks / and metal plates 2 located between the bricks. The space between the projections 3 of the plates 2 is filled with shotcrete 4. The laying of the roof with the help of the suspension system 5 is attached to metal structures 6.

The arch of the furnace is gathered in the usual way on the formwork. For the installation on the formwork, the edges of the plates 2 are bent at a right angle to the required length and, after the formwork is lowered, they are bent manually or using a special tool. In this case, the ends of the plates are released into the working space of the furnace.

In the case of the use of specially designed formwork with slits for plastas, the latter can be discharged inside the furnace immediately when laying the arch to the required length.

Recommended plate size: thickness 0.5-1.0 mm; width - equal to or slightly less than the width of the faces of bricks.

The filling of the space between the plates with a refractory mass is carried out by means of gunning semi-dry gunning.

As shotcrete can be used

various refractory gun mounts (magnesite, chromite, aluminosilicate,

dinasic, etc.) with a grain size of 4-O mzh.

In order to increase the adhesion of the gunning mixture to the plates, it is advisable that the edges of the latter be cut and bent in opposite directions.

When filling the space between the plates with a refractory mass on the arch of burned refractory bricks, a monolithic layer is obtained that has a high thermal resistance and low thermal conductivity. Such a monolithic layer cannot be obtained when laying brick-roof vault in cassettes or sectional brick in cassettes consisting of fired and unburned parts. The length of the parts of the plates released into the working space and, consequently, the thickness of the applied shotcrete layer can be adjusted, which makes it possible to achieve equilibrium in all parts of the roof with an overall increase in its service life.

Subject invention

The arch of the open-hearth furnace containing refractory masonry of bricks and metal plates located between them, characterized in that, in order to increase the thermal stability of masonry and reduce heat loss through the arch, the metal plates are installed with their lower ends below the working surface of the arch, protruding into the working space of the furnace, the ends of the plates are filled with shotcrete.