EP1036848B1 - Runner for a shaft furnace - Google Patents

Abstract

A shaft furnace runner, has internally cooled copper staves (5) within or adjacent its refractory lining. An Independent claim is also included for the use of a copper stave, as described above, for cooling a tapping runner especially of a shaft furnace.

Description

The present invention relates to a tapping channel for a shaft furnace, in particular for a blast furnace for the production of pig iron, consisting of a Trough with a refractory, the liquid metal or the slag leading liner and at least one plate-shaped cooling element made of copper or a Copper alloy (copper stave) with coolant channels arranged in its interior.

As well as the duration of a blast furnace trip mainly from the lifetime of the blast furnace shell determines the wear characteristics of the Lining a tapping channel their life.

To increase the life of a tapping gutter, it is known at a tapping for a shaft furnace, which consists of a trough with a refractory, the Liquid metal leading liner exists within the refractory lining hollow cooling elements with connecting pipes for the inflow and outflow of Provide cooling water. These cooling elements are in turn limited by plates. Parallel to these plates are more copper plates, but not in connection stand with the cooling element. These cooling elements are To coils of heat-resistant steel, in a conventional manner with anchors are fixed in the wear chuck of the tapping chute. It is still known welded To provide copper profiles as cooling elements for taps.

When cooling the wall in the blast furnace, it is well known that two systems are used Commitment. These are on the one hand cooling boxes, on the other plate-shaped cooling elements, so-called staves. There are cooling plate systems made of copper plates as well Plate cooler made of nodular cast iron. Staves cool areal the entire blast furnace tank and require little passage. Gray cast staves are usually cooling elements, be poured into the cooling pipes.

Copper staves have been known for more than 15 years for the cooling of blast furnaces. As starting material, rolled copper slabs were selected. The Cooling element was set by drilling the cooling channels, welding thick-walled Copper pipes for the supply of water through the blast furnace tank and a suitable mechanical machining of the stave surface ago. Copper staves are usually 150mm thick and allow for given thickness of the Masonry an increase in volume of the blast furnace from 3 to 5%. Usually Copper staves are combined with refractory bricks when installed. A well-known example of copper staves is shown in DE 29 07 511 C2

From the post-published EP 1 047 796 A1 is a tapping channel for a Shaft furnace known, which consists of a trough with a refractory lining. Cooling elements are located - adjacent to the refractory lining - between this and the trough surrounding the lining.

Based on this known prior art, it is an object of the present invention Invention to increase the life of a tapping channel.

This object is achieved by means of the features of claim 1. It is proposed that the trough be made of metal outer side walls, a subsequent permanent feed and an inner wear lining and wherein the plate-shaped cooling elements semi-annular between permanent feed and wear lining or within the wear lining are arranged.

It will be the use of those already known in the cooling of the blast furnace shell Copper cooling plates, i. Copper staves, for the cooling of taps proposed. Advantageous embodiments of the invention are in the subclaims disclosed.

By this surprising and hitherto unknown use of copper staves For taps, especially those of blast furnaces, the following results Advantages:

Due to the optimal cooling effect due to the copper staves, the service life is reduced of the refractory material of a tapping channel (or pool trough) increases and the signs of wear reduced. It will increase the durability of the refractory material achieved and thus a saving of refractory material costs. Also, due to the cooling effect, the amount of costly refractory material be downsized. Cooling causes wear Decarburization and oxidation phenomena prevented in the refractory material.

Preferably, the copper stave is facing the melt or slag on it Side partially provided with refractory material. This can be, for example be achieved by the the melt or Schlackenfluß facing side of the copper staves incorporated horizontally extending grooves having refractory material.

The copper stave is preferably cast or rolled or forged. At a cast plate, the cooling channels are either through cast-in tubes formed or poured directly.

A particularly preferred embodiment of a copper stave is made of a Forged or rolled ingot manufactured, with the cooling channels vertically are running blind holes.

To create the coolant flow, the copper staves have connecting pipes for the coolant supply and discharge. It can be one or more Be provided cooling circuits; at the smallest unit has each plate-shaped Cooling element a separate circuit. The coolant is water depending on your choice, Oil, air or steam.

Figur 1

die Seitenansicht einer ersten Ausführungsform einer Abstichrinne mit innerhalb des Dauerfutters eingebrachten Cu-Staves;

Figur 2

den Querschnitt II-II der Abstichrinne nach Figur 1;

Figur 3

den Querschnitt einer zweiten Ausführungsform einer Abstichrinne.

Further advantages and features of the invention will become apparent from the following description of a preferred embodiment with reference to the accompanying drawings. Show:

FIG. 1

the side view of a first embodiment of a tapping channel with introduced within the Dauerfutters Cu-Staves;

FIG. 2

the cross section II-II of the tapping channel of Figure 1;

FIG. 3

the cross section of a second embodiment of a tapping.

The tapping channel 1 shown in Figure 1 consists essentially of a metallic Trough 2 (see in particular Figures 2 and 3), which of a support structure 3 is surrounded. To cool the inlet area of the tapping chute are along the longitudinal axis of the tapping channel 1 approximately at the level of the tapping channel 4 each side a position of two successively arranged plate-shaped Cooling elements 5 are provided. In these plate-shaped cooling elements is they are Cu staloms made of solid Cu bodies introduced by blind holes Cooling channels 6. Each of the Cu staves is triangular in shape on both sides End piece 7a, 7b extended. The triangular end pieces 7a, 7b are there formed at such that the edges of two end pieces abut diagonally. In the approximate centers of gravity of the triangular end pieces 7a, 7b there is enough space for the connection of pipe sockets or connecting pipes 8a, 8b for the supply and removal of the coolant. For this purpose, the pipe socket or connecting pipes 8a, 8b with also introduced into the tails manifolds (not shown), which the coolant in the - here four parallel - Feed or discharge coolant channels 6. Due to the complementary formed to each other triangular end pieces 7a, 7b is a suitable Cooling reaches even at the joint areas of two cooling plates 5, because each the area with the coolant flowing through connecting piece its effect the adjacent cooling plate expands.

FIG. 2 shows the cross section of the tapping spout according to FIG. 1 in its inlet region. The metallic trough 2, which is surrounded by the support structure 3, is with a permanent lining 9 made of refractory material and with an adjoining Wear lining 10 lined. The along the longitudinal axis of the tapping channel arranged Cu staves 5 are arranged approximately at the level of the tapping channel 4. These are because of the triangular end pieces in height to each other staggered pipe socket 8a, 8b to the inlet and outlet of the coolant recognizable. The Cu staves point to the tapping channel and thus the Melt or slag facing side horizontally extending grooves 11, in the interstices refractory material is incorporated.

With the figure 3, the cross section of a second embodiment of a tapping channel shown. The height of the cross section is approximately equal to the section III-III. In this embodiment, the Cu staves over the inlet region of Tapping trough arranged along the longitudinal side within the Dauerfutters (not shown in Figure 1). Furthermore, the trough is different according to the embodiment of the metallic trough. 2

Claims (9)

1. Runner for a shaft furnace, particularly for a blast furnace for producing pig iron, consisting of a trough (2) with a refractory lining conducting the liquid metal or the slag and at least one plate-shaped cooling element (5) of copper or a copper alloy (copper stave) with coolant channels (6) arranged in its interior, characterised in that the trough (2) comprises - consisting of metal - outer side walls, an outer lining (9) adjoining thereat and an inner wear lining (10) and wherein the plate-shaped cooling elements are arranged in semi-annular form between outer lining (9) and wear lining (10) or within the wear lining (10).
2. Runner according to claim 1, characterised in that each plate-shaped cooling element (5) of the cooling element layer is prolonged at its two ends by triangular end members (7a, 7b) which are of mutually complementary construction so that two adjacent cooling plates abut one another by diagonally extending edges and that the connecting pipe ducts (8a, 8b) for the coolant feed and discharge are provided each time in the centre of area of the triangular end members (7a, 7b), the ducts being connected with a collecting channel for supplying the coolant channels or for discharge of the coolant.
3. Runner according to claim 1 or 2, characterised in that the plate-shaped cooling element (5) is provided on the side facing the melt or the slag with, in part, refractory material.
4. Runner according to one of claims 1 to 3, characterised in that the plate-shaped cooling element (5) is cast or rolled or forged.
5. Runner according to claim 4, characterised in that in the case of the cast plate-shaped cooling element (5) the cooling channels (6) are either formed by pipes cast in place or are directly cast in place.
6. Runner according to one of claims 1 to 3, characterised in that the plate-shaped cooling element (5) is made from a forged or rolled bloom and the cooling channels (6) are vertically extending blind bores.
7. Runner according to one of claims 1 to 6, characterised in that the side of the plate-shaped cooling element (5) facing the melt flow or slag flow has machined, horizontally extending grooves (11) for receiving the refractory material.
8. Runner according to one of claims 1 to 7, characterised in that the plate-shaped cooling elements (5) or units of several plate-shaped cooling elements (5) have connecting pipe ducts (8a, 8b) for the coolant feed and discharge.
9. Runner according to one of claims 1 to 8, characterised in that the metallic trough (2) is lined by an outer lining (9) and a wear lining (19) adjoining thereat, wherein the channel (4) for the tapped-off melt is machined into the wear lining (10) and that a plurality of plate-shaped cooling elements (5) with coolant channels (6) extending longitudinally of the runner is arranged, with the elements adjacent one another, in a single layer at the height of the runner (4) within the outer lining (9).

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