SU454255A1 - Chip Burner - Google Patents

Description

one

The invention relates to the metallurgical preparation of secondary metals for remelting by preheating them and can be used for pre-burning of steel alloyed oily chips before remelting them in electric arc furnaces.

A device for burning chips is known, comprising a furnace with burners and a metal grill on which a container with a perforated opening bottom is installed.

A disadvantage of the known device is the low durability of the container lining due to a sharp change in one chip firing cycle for its inner surface temperature from 900 to 50 ° and falling on the lining of water and oil, as well as the low durability of the lining of the furnace due to contact with it through the holes in the bottom of the container of water and oil from the baked chips.

The purpose of the invention is to improve the reliability of the device in operation. For this, it is provided with two trough-shaped containers located on a metal grid so that the edges of the upper rows of containers overlap the edges of the lower rows of containers, and the container case is hollow with openings in the lower part of the outer and in the upper part in the morning walls.

FIG. 1 shows the described device, a general view; in fig. 2 shows a section along A-A in FIG. one; in fig. 3 is a view along arrow B in FIG. one; in fig. 4 shows a section along B-B in FIG. one.

The device has a furnace 1 with burners (not shown), a metal grid 2 and a container 3 mounted on the furnace. The heating container 3 consists of a flat cylindrical casing 4 with openings 5 in the lower part of its outer wall 6 and openings 7 in the upper part the inner wall 8. In the upper part of the casing fixed tapered ring 9.

Between the outer 6 and inner 8 walls of the container 3, longitudinal ribs 10 are formed, forming air channels 11 communicating with atmospheric air through the openings 5 and through combustion openings 7 with the combustion products inside the container. In the inner part of the container, the wall 8 has tapering down ribs 12. In the lower part, the container 3 has legs 13, welded to the casing, a perforated opening bottom 14 with ribs 15, the halves of which are hinged to the casing base 16, and the knife 17 sand shutter. The halves of the bottom 14 are connected to the hinge 18 by a hinge.

In the upper part of the container 3 has a ring 19 attached to the casing, limiting

moving up the movable ring 20, pivotally connected to the lifting and transporting of the folding head plate 21 and tami 18.

The grill 2 contains trough-shaped containers 22 in the form of, for example, corners, attached to the transverse ribs 23 and installed by two tiers so that the edges of the tanks top of its row overlap the corresponding edges of the tanks of the lower row by 3-5 mm. The trough-shaped containers 22 and transverse ribs 23 are connected L1 between themselves by a shell 24 and a ring 25 attached to their ends.

Before baking, the container is loaded with chips, which, on the tapered ring 9, slides over the container. The ring 9 prevents chips from falling into the air ducts 11 and promotes a uniform distribution of the chips at the points of contact with the wall 8 of the container and the fins 12.

The container is filled approximately at the height of its height, so that the upper level of the chips is 0.2 m below the edge of the conical ring 9. At the same time, the holes 7 located at the edge of the ring 9 remain unclosed chips.

When the container 3 is placed on the furnace 1, the oil and water flowing from the chips pass through the holes in the bottom 14 and, falling into the furnace, are collected in trough-shaped containers 22 of the grid 2.

In the chip burning process, the combustion products of the fuel gas, coming from the combustion zone to the grid 2, wash its trough-shaped containers 22 and transverse fins 23, freely passing to the bottom 14 and enter the container 3 through its openings. Since the unbaked chips have a small porosity, products

Combustion does not pass through the entire chip thickness, but is washed around the periphery, the passage between the ribs 15 and entering the upper part of the volume of the container 3 free of chips, from where they are sucked into the atmosphere outside the device. At the same time, the secondary part of the volume of the container 3 through the openings 7 also enters the chip-free upper part of the atmosphere, which is drawn in from the atmosphere surrounding the device into the openings 5 and heated from contact with the wall 8 as the channels 11 pass.

As the trough-shaped tanks 22 are heated, the oil and water in them evaporates, mixing with the combustion products that wash the tanks 22, and go along with the latter to the bottom 14 of the container 3.

At the end of the burning, the container 3 is removed from the furnace 1, transferred to the smelting furnace, the container 3 is placed on it and, lowering the beam 21 with the ring 20, the bottom 14 is opened and the burned chips are unloaded into the furnace.

Subject invention

A chip burning device comprising a furnace with burners and a metal grill on which a container with a perforated opening bottom is mounted, characterized in that, in order to increase operating reliability, it is provided with two trough-shaped containers located on the metal grill so that the edges of the containers the upper row and cover the edges of the containers of the lower row,

and the container case is hollow with openings in the lower part of the outer and in the upper part of the inner wall.

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