RU1803690C - Carbon article graphitization electric resistance furnace - Google Patents

Abstract

Usage: the invention relates to the production of carbon products and can be used in the electrode and electrical industries. Summary of the invention: in the current supply end of the furnace, current supply electrodes are embedded in one of the end walls of the furnace with a gap relative to the screen (in the direction of the current). The gap is made of dispersed carbon material, for example, graphite chips. The location of the electrodes with a gap relative to the screen reduces the temperature drop along the length of the current supply, reduces repair costs. 2 ill.

Description

ate

with

The invention relates to electric resistance furnaces for graphitization of carbon products and can be used in the electrode and electrical industries.

The purpose of the invention is to increase the service life by reducing the temperature difference along the length of the electrodes.

The goal is achieved due to the fact that in the current-conducting end of the furnace, including current-carrying electrodes embedded in one of the end walls of the chamber, graphite screens and dispersed carbon backfill, the current-carrying electrodes are installed with a gap relative to the screen, which is filled with dispersed carbon material, for example graphite shavings.

The design of the current supply end of the furnace makes it possible to reduce the length of the current supply electrodes and significantly reduce the temperature drop along the length of the current supply.

Figure 1a, b shows cross-sections of known furnaces; on figv is a cross section of this furnace; Fig. 1d shows the nature of the temperature change along the length of the electrodes; Figure 2 shows the design of the furnace.

The design of the current-carrying end face of the furnace contains graphite current leads 1, graphite screen 2, graphite shavings 3, end wall 4, chamotte refractory furnaces, an aqueous contact cooling system 5, graphite - copper; copper busbars 6 to the power supply, bottom 7 of the chamotte refractory furnace, heat-insulating charge 8 based on coal coke, filling 9, coke 10-25 mm; graphite blanks 10.

00

about

CA) Oh

ABOUT

As studies on a laboratory furnace have shown, it is advisable to make the gap between the ends of the current leads and the graphite screen so that it can be carefully and uniformly filled, which is 100-20 mm. In addition, when filling this gap with graphite chips, the electrical resistance in the gap increases by only 3-6% of the resistance of the material of the current leads.

The furnace operates as follows. When the furnace is connected to an electric power source (not shown in the drawing), the current through the buses 6 and current leads 1, the layer of graphitized chips 3, located in the gap between the inner end of the current lead located in the furnace and screen 2, screen 2 is brought into the working oven space.

When the furnace load is heated to 2800-3000 ° C in the furnace working space, the nature of the temperature change in the current supply end along the current supply axis will have the form shown by the dashed line in Fig. 1 g. From which it is clear that the difference in

the current supply will be 2 times less than with known solutions.

In addition, even when a separate current lead fails, the cost of repairing it will be approximately 25-30% less, because the length of the current leads in comparison with the known design of the furnace is less (by an amount equal to the size of the gap plus the thickness of the screen).

Claims (1)

Moreover, the new design eliminates the disadvantages of the end face, as when loading and unloading the furnace, the space of the working chamber is separated by a graphite screen. The claims Acheson type electric resistance furnace for graphitization of carbon products, containing a chamber, graphite end shields installed in it with gaps relative to the end walls, carbon backfill in the gap and current-conducting electrodes located in the chamber end wall, characterized in that, in order to increase the service life by reducing the temperature difference the length of the electrodes, the electrodes are installed with a gap relative to the screen. "D / g.