GB2023787A

GB2023787A - Electric arc furnace pot

Info

Publication number: GB2023787A
Application number: GB7921998A
Authority: GB
Original assignee: BBC Brown Boveri AG Switzerland; BBC Brown Boveri France SA
Current assignee: BBC Brown Boveri AG Switzerland; BBC Brown Boveri France SA
Priority date: 1978-06-27
Filing date: 1979-06-25
Publication date: 1980-01-03
Also published as: BR7903996A; FR2429984A1; JPS633235B2; CH631007A5; DE7820193U1; GB2023787B; DE2829505A1; IT1121870B; IT7923758A0; FR2429984B1; JPS556200A

Abstract

An electric arc furnace pot which is provided with one tapping lip 6 and at least one clinkering door 8 and a pot upper part 2 and a pot lower part 1 is divided along a parting line 3', 3, 3', the parting line being disposed above the tapping lip 6 to prevent flooding of the parting line in the area of the tapping lip. <IMAGE>

Description

SPECIFICATION Electric arc furnace pot The invention concerns a pot of an electric arc furnace with one tapping lip and at least one clinkering door in which the pot upper part and the pot lower part are divided along a parting line.

For a number of years, divided furnace pots have increasingly been used in electric arc furnaces. The furnace pots are divided horizontally at the most about 200 to 300 mm above the melting bath. The dividing point is placed low in order to minimize the brick lining surface remaining in the lower part. If the ceramic brick lining has to be replaced, the upper part of the pot is removed. The brick lining to be removed from the lower part of the pot, designated as the hearth, can then be easily taken out and replaced by new fireresistant material. After the replacement procedure, a second pot upper part already previously made available is placed on the hearth.

The advantage of this procedure consists in that the new placing of the divided pot can be carried out in a shorter time than in the case of the nondivided furnace pot.

A design form of construction of the abovementioned type such as this is, for example, shown in the prospectus ''Korf-Fuchs-System- technik, Stahlzeugung; Wasserkuehisysteme fur Lichtbogenoefen" (Korf-Fuchs Systems for Electric Arc Furnaces) of the firm Gerhard Fuschs KG, Grossapparatebau, Willstaett-Legelshurst, undated.

The disadvantages of such well-known procedures are due to the fact that, when tipping, the parting line between the pot parts becomes or can become flooded by liquid melt in the area of the furnace lip. If this parting line is not designed with the greatest care and made tight with fire-resistant material, there is the danger of a breakthrough of the melt later on in the operation.

In accordance with this invention, there is provided a pot of an electric arc furnace, having one tapping lip and at least one clinkering door and having a pot upper part and a pot lower part which are divided along a parting line, the parting line being disposed above the tapping lip to prevent flooding of the parting line as the melt is poured.

Embodiments of this invention will now be described, by way of example only, with reference to the accompanying drawings, in which: Figure 1 is a vertical section through an embodiment of pot in which the pot upper part is lined with brick; Figure 2 is a similar section through an embodiment of pot wherein the pot upper part is essentially formed by a cooling box; Figure 3 is a vertical part section of a third embodiment in which both the parting line as well as a cooling box are depicted; and Figure 4 is a circumferential projection of brick lining of the pot upper part of Fig. 1 on a reduced scale.

The advantages of the present invention are achieved by disposing the parting line above the tapping lip, so that the parting line in that area will not be flooded by the melt when the pot is tipped. As a further consequence, the parting line need not form such a tight seal as previously required. The greatest possible portion of the wearing surface of the pot remains within the upper part of the pot which facilitates repair.

The area of the clinkering door may also be protected against a possible breakthrough of the melt when removing the slag. Since all brick work can be carried out with respect to the lower part of the pot, the exchange of the upper part of the pot is no longer necessary within the previously required intervals thus saving considerable operating costs.

The pot of an electric arc furnace of the present invention depicted in Fig. 1 includes a pot lower part 1 and a pot upper part 2 which are separated by a parting line 3. The parting line 3 is raised along portions 3' such that the line is disposed above the tapping lip 6 and clinkering door 8. The pot upper part 2 and lower part 1 are lined with surface brick linings 4 and 5, respectively. Fastening arrangements 7 are used to hold the pot lower part 1 and the pot upper part 2 (shown as cooling box 1 3 in Fig. 2) together. Because the parting line is disposed above the clinkering door 8, flooding of the parting line in that area is avoided.

The dotted lines (Fig. 1) depict the bath (i.e., the melt) 9 in different working positions of the pot. The highest position of the bath during melting is designated as 1 0. The highest position of the melt when removing slag is designated as 11, with the highest position of the melt during pouring being designated as 12.

Pot upper part 2 may include a cooling box 1 3 (Fig. 3). The cooling box 1 3 is disposed within an annular space bounded by a pot inside wall 14, an upper edge plate 1 5 and a cylindrical outside wall 1 6. Iron parts 1 7 are attached by suitable means (e.g., by welding) to the inside wall 14 of the pot. A thin ceramic layer 1 8 is sprayed onto the inside wall 1 4 and protects the inside wall. Water duct plates 1 9 are arranged in the inside of the cooling box 1 3 to ensure uniform cooling and the cooling box is provided with an intake 21 and an outtake 22. It is supported on a flange-type supporting plate 20 which is held together with a fastening arrangement 7 (e.g., bolts and wedges). A part of a receptacle 23 in which the brick lining 4 is built is also depicted.

Fig. 4 shows on a reduced scale the brick lining 5 of Fig. 1. A recess is provided for the tapping lip 6 as well as for the clinkering door 8.

Claims

1. A pot of an electric arc furnace, having one tapping lip and a least one clinkering door and having a pot upper part and a pot lower part which are divided along a parting line, the parting line being disposed above the tapping lip to prevent flooding of the parting line as the melt is poured.

2. A pot as claimed in claim 1, wherein the parting line is raised in the area of the tapping lip.

3. A pot as claimed in claim 1 or 2, wherein the parting line is raised in the area of the clinkering door.

4. A pot as claimed in claim 1, 2 or 3 wherein the pot upper part includes a cooling means.

5. A pot as claimed in claim 4 wherein the cooling means is a water cooling box.

6. A pot as claimed in claim 5, wherein the cooling box is disposed within an annular space in the wall of the pot upper part and is provided with means to circuiate water therethrough.

7. A pot substantially as herein described with reference to Figs. 1 and 4 or Fig. 2 or 3 of the accompanying drawings.