SU815444A1 - Furnace for graphitizing of carboniferous articles - Google Patents

Description

(54) FURNACE FOR GRAPHITE CARBON PRODUCTS

one

The invention relates to electrothermal, in particular, to devices for high-temperature heat treatment of an electro-coal semi-finished product.

A known furnace for graphitizing carbonaceous materials and products, comprising a housing, a tunnel chamber with preheating, graphitization and cooling zones, loading and unloading devices 1.

The lack of a furnace is a low service life, due to the deposition on the tunnel walls of ash components released from graphitized materials and products, and the intensive wear of a graphite heater operating in hydrogen at 2500-3000 ° C.

Also known is a furnace for graphitizing carbon materials and products, comprising a housing, a tunnel chamber with preheating, graphitization and cooling zones, a device for moving articles made in the form of a conveyor belt of graphitic fiber material placed in the chamber, a device for removing heat treatment products, made in the form of fibrous

carbon-containing tape placed with the possibility of longitudinal movement between the machined products and the walls of the chamber 2.

In this furnace, the ash components separated from the graphitized products are captured and removed; however, due to the presence of a fibrous ribbon between the products and the graphite heater, an intense wear of the heater and the ribbon occurs, which reduces the service life of the furnace.

The purpose of the invention is to increase the reliability of the furnace.

This goal is achieved by the fact that the tape is made with the possibility of lateral movement and is installed outside the zone of graphitization.

FIG. 1 shows the oven, general view; in fig. 2 shows section A-A in FIG. one; in fig. 3 - oven, vertical section; in fig. 4 shows a section BB in FIG. 3. The furnace consists of a housing 1, for example, a carborundum, a tunnel chamber 2 consisting of a hollow graphite heater 3 forming a graphitization zone, a graphite current lead 4 forming a preheating pit, a graphite current lead 5 forming a cooling zone. Between the housing 1 and the outer surface of the tunnel chamber 2 is placed thermal insulation 6, for example, fibrous material. To the ends of the current leads 4 and 5 are connected gas valves 7 with gas supply fittings. 8. The furnace is equipped with a boot 9 and 10 discharge devices (bunkers). At the junction of the graphitization zone 3 and preheating 4, the tunnel chamber 2 intersects the carbon-containing fiber tape 11 with the drive 12 and guide rollers 13 designed to move the tape 11. The carbon-containing tape 11 can also be placed at the junction of the graphitization 3 and cooling 5. Products are placed in the tunnel chamber 2 with a technological gap relative to the inner surface of the chamber 2 and the tape 11.

A conveyor belt 15, made of graphitized fibrous material and provided with drive 16 and guide rollers 17, is installed to move the products 14 through the oven.

The furnace works as follows. . The graphite heater 3 is brought to a predetermined temperature with a continuous supply of inert gas to the gates 7. After the furnace is brought into equilibrium mode, the conveyor 15 and carbon-containing tape 11 are moved by means of rollers 12, 13, 16 and 17. From the hopper 9, the product is fed to tape 15 and move it along the chamber 2.

The ash impurities released from the products 14 are deposited on a moving 1G belt and removed from the furnace. The speed of movement of the conveyor belt 15 is determined by a predetermined temperature rise schedule and the required isothermal holding at the final temperature. The rate of movement of the carbon-containing tape 11 is determined by the rate of deposition of ash impurities on it.

The design of the tunnel chamber and technological equipment in it are similar to that described. The difference lies in the design of devices for transporting products through the furnace.

Products 14 from the hopper 9 enter the furnace in the form of a foot and are supported in it by the support 18.

The movement of the products 14 in the vertical direction occurs as the stroke of the support 18, driven by a hydraulic cylinder. The transfer of products 14 from the foot to the hopper 10 is performed as follows. Clamps 19 and 20, which clamp the foot, lower the support 18 with the remaining non-pressed part of the stack of products 14, stack the pusher 21 and push the finished product into the hopper 10. and the support 18 released from the products is raised to the lower level of the foot, clamps 19 and 20 are retracted, the support 18 is again lowered and the cycle is repeated.

The furnace provides graphitization of electric-coal products at temperatures exceeding 2600 ° C, with the continuous removal of ash impurities from the furnace, and the wear of the heater and carbon-containing tape is much lower than in known furnaces with passing the tape along the entire furnace.

Claims (2)

1. USSR author's certificate number 456569, cl. F 27 B 9/22, 1971. 2. USSR author's certificate number 551487, cl. F 27 B 9/24, 1975. 16 FIG. 1 12 FIG. 2 W 12