SU409541A1 - Gas cupola furnace - Google Patents

Description

one

This invention relates to the field of foundry and concerns gas furnaces.

Known gas cupola, equipped with a water-cooled jumper.

However, this cupola has a relatively complex lining, which makes it difficult to prepare the cupola for smelting. Moreover, the design of this cupola does not allow achieving a high degree of uniform gas distribution over the shaft section.

The proposed gas cupola is different from the one known for the fact that water-cooled lintels are installed in a checkerboard pattern. In this case, the lower bar overlaps in terms of the gaps between the upper pereglachkami.

This makes it possible to achieve a uniform distribution of gases over the cross section, of the cupola chamber.

FIG. 1 shows the proposed cupola, a vertical section; in fig. 2 is a section along A-A of FIG. 1, in FIG. 3 - water cooled crossings in the section.

The cupola contains a vertical shaft 1, gas burners 2 located above the bottom 3, air and gas collectors 4 and 5, and water cooling manifolds. in mine 1 there are perematki 7 located between two opposite walls. The bridges are shifted one relative to the other in the vertical and horizontal directions so that between them channels 8 are formed for the passage of gases and metal. The upper bridges overlap the lower ones, by an amount equal to 0.3-1.5 distances between the upper and lower bridges.

This, firstly, allows achieving a uniform distribution of gases across the shaft section and, secondly, eliminating the dumping of the loaded shaft into the overheating chamber. Lintels 7 are made in the form of pipes 9 with refractory glasses 10 mounted on them. The upper part of pipes 9 is protected from blows of the charge being loaded with a layer of refractory brick with ridges 11.

The gas cupola works as follows.

Before the start of smelting, gas burners 2 are turned on, and the lining of the cupola is heated to a temperature near the bottom and to 1000 ° C 6 of the upper part of the shaft. After

0

when heating is completed, when the gas burners are working, a mixture consisting of metal and flux is loaded into the cupola chamber.

Hot gases produced as a result of burning the gas-air mixture melt the metal on water-cooled bridges 7. Drops of liquid metal fall on the bottom 3. At the time of the fall of the liquid metal, they overheat as a result of contact with the burning gas combustion products and the red-hot Lining of the cupola. . Further overheating of the liquid metal occurs in the pool at the bottom 3 due to the directional effect of the hot plumes of the gas-air mixture.

The molten and superheated metal together with the slag flows from the pool along the transitional letke 12 into the accumulator 13.

The proposed gas cupola is simple in design, allows uniform gas distribution, reduces fusion of bridges due to the presence of several channels for the passage of gases and metal, eliminates the formation of walling and greatly simplifies the repair of the lining.

invention formula

The gas cupola, which includes the shaft and the overheating chamber, is separated by water-cooled bridges and, in order to evenly distribute the gases over the cross-section of the cupola-shaft, water-cooled bridges are installed in a checkerboard pattern, with the lower bridges covering the gaps between the upper bridges jumpers.

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five

A a

Fi.Z

Claims (1)

Claim A gas cupola, including a shaft and an overheating chamber, separated by water-cooled bridges, characterized in that, with the aim of uniform distribution of gases over the cupola shaft section, the water-cooled bridges are staggered, and the lower bridges overlap in the plan of the gap between the upper bridges. Fi g. 1 Aa 5 4 ---- Fig.Z