SU673824A2 - Travelling oven for heat treatment of carbon materials and articles - Google Patents

Description

I

The invention relates to the field of chemical technology, namely, to furnaces for the heat treatment of carbon materials and products.

The closest technical solution known is a conveyor oven for heat treatment of carbonaceous materials and products, containing a tunnel chamber with a conveyor belt in it made of graphitized fibrous material 1. A disadvantage of the known oven is the low lifetime of the tunnel chamber due to intensive deposition zones of heating, cooling of ash impurities released from carbonitic materials with a high content of impurities that are graphitized at temperatures of 2500-2900 ° C.

The aim of the invention is to increase the duration of the continuous operation of the furnace during the graphitization of high-ash materials by reducing the deposits of ash impurities.

This goal is achieved by the fact that a conveyor oven containing a tunnel chamber with a conveyor belt arranged therein, made of graphite

fibrous material, provided with a screen mounted to move along the axis of the chamber between the arch of the camera and the conveyor belt.

Additional differences are

in that the furnace is equipped with a continuous carbon-graphite tape mounted on the screen, the drive rollers of which are mounted outside the chamber.

Such an embodiment of the furnace makes it possible to increase the duration of continuous operation during the graphitization of high-ash materials by reducing deposits of ash impurities on the walls of the chamber.

FIG. 1 shows a longitudinal section of the furnace; in fig. 2 shows a section along A-.A of FIG. one:

in fig. 3 is a section along BB, FIG. one.

The conveyor oven for heat treatment of carbon materials and products contains a tunnel chamber 1 with a conveyor belt 2 placed therein, made of graphitized fibrous material. The tunnel chamber 1 is formed by preheating, graphitization and cooling zones. The preheating zone consists of a graphite adapter 3. The graphitization zone is formed by a high-temperature graphite heater 4. The cooling zone consists of a graphite non-adapter 5, cooled outside. A screen 6 is disposed between the arch of camera 1 and the conveyor belt 2 mounted for movement along the axis of camera 1. On screen 6, continuous carbon tape 7 is mounted, the drive rollers 8 of which are mounted outside camera 1 at a distance exceeding screen length 6. Tunnel chamber 1 surrounded by thermal insulation 9 and a casing 10. Screen 6 outside the chamber 1 is provided with clamps 11 fixed in metal rods 12 with the ability to move perpendicular to the axis of the camera 1. The rigs 12 are fixed in supports 13 with the ability to move parallel to and the chamber 1.

The device works as follows. The graphite heater 4 is brought to a predetermined temperature (2500-2900 ° C) with a continuous supply of inert gas to fitting 14 in order to maintain a protective atmosphere in chamber 1. After the furnace is brought to the equilibrium thermal mode, the conveyor belt 2 is set in motion by turning on the drive roller electric motor 15. Screen 6 with continuous tape 7 mounted on it is introduced into chamber 1 and placed in metal tunnels 12 with metal clamps 11 chamber 1, bringing it all the way to the heater 4 (Fig. 2). The belt 7 is driven (by turning on the electric motor of the drive roller 8), which moves around the screen 6 and enters the tunnel chamber 1 between the arch of the camera 1 and the screen 6 (Fig. 1). The processed products 16 with a high content of ash impurities are loaded onto the conveyor belt 2 at the entrance to chamber 1. The products successively pass a heating and graphitization zone on the tape 2, graphitized products enter the cooling zone, then they leave the furnace and enter the discharge. The conveyor belt 2 released from the processed products, the tensioning roller 17, re-enters the load of non-heat-treated products and the cycle repeats.

As the kiln operates, a significant part of the ash impurities released from the graphitized products 16 is deposited on the surface of the belt 7 and removed from the tunnel chamber 1. The belt 7 is cleaned of descending ash impurities outside the tunnel chamber 1 using mechanical devices, a vacuum cleaner, etc. Some of the ash impurities are deposited on the surface of the screen b. When a certain thickness of sediment is reached or after a predetermined time, screen 6 with tape 7 mounted on it using clamps 11 and 12 goes out of chamber 1, a new screen 6 is inserted inside tape 7 instead of waste screen along with tape 7 mounted on it into chamber 1 to its original position (Fig. 3). Since the duration of the replacement of the screen 6 is small, it does not require the termination of the process of continuous graphitization of carbon products.

As the ribbons 2 and 7 are activated, new ribbons of graphitized fibrous material are made with graphitized fiber yarn to them, and the used tapes or their sections are excluded from work, while the furnace continues to operate in the continuous graphitization mode of the carbonaceous material.

The screen 6 with continuous tape 7 mounted on it during graphitization of high-ash material can be installed along the entire tunnel chamber 1, at a graphitization temperature of 2500–2900 ° C, it is advisable to place it in a preheating zone, since no ash impurities are deposited at these temperatures, With the limited length of the tunnel chamber 1, the screen 6 should also be placed in the cooling zone.

Equipped with a movable screen and continuous tape mounted on the screen, the furnaces can reduce the deposition of ash impurities on the walls of the tunnel chamber and, during the operation of the furnace, clean the tape and the screen, and also replace the screen in case of accumulation of a layer on it provides an increase in the duration of continuous operation.

Claims (2)

Invention Formula . Conveyor oven for heat treatment of carbon materials and products by avtsv. No. 499485, characterized in that, in order to increase the duration of continuous operation during the graphitization of high-ash materials by reducing the deposits of ash impurities, it is equipped with a screen mounted to move along the chamber axis between the chamber arch and the conveyor belt. 2. The furnace according to claim 1, characterized in that it is provided with a continuous carbon-graphite tape mounted on, whose drive rollers are installed outside the camera Sources of information taken into account in the examination 1. USSR author's certificate No. 499485, cl. F 27 B 9/24, 21.06.T4, 87 5 73 7 5 /2.2