Fluid-cooled copper lid for arc furnace

Patent metadata

Field	Value
Publication number	US-10488114-B1
Application number	US-201615177890-A
Country	US
Kind code	B1
Filing date	Jun 9, 2016
Priority date	Jun 9, 2015
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

An outer lid for an arc furnace includes an outer lid formed from copper or a copper alloy. The outer lid also includes electrode ports, an off-gas chute, and a charge chute. Cooling circuits are present within the outer lid. The bottom surface of the outer lid is exposed to the internal volume of a crucible, and promotes accretion of slag, which can act as a heat barrier.

First claim

The invention claimed is:

1. An outer lid for an arc furnace, comprising:
a top surface and a bottom surface;
a plurality of electrode ports;
an off-gas chute;
a charge chute;
a plurality of cooling circuits within the outer lid for flowing a cooling fluid, each cooling circuit comprising an inlet and an outlet, wherein each electrode port has a cooling circuit surrounding it, and at least one cooling circuit runs around an outer perimeter of the outer lid; and
a fluid-cooled sleeve for the off-gas chute, wherein the fluid-cooled sleeve comprises a sidewall and a flange for securing the sleeve to the top surface of the outer lid, the sidewall having a cooling circuit running therethrough designed to deliver water first to a bottom of the sidewall and then flow around the sidewall to a top of the sidewall, and the sleeve having a length sufficient to extend entirely through the off-gas chute;
wherein the outer lid is made of copper or a copper alloy.

2. The outer lid of claim 1 , wherein the bottom surface is shaped to promote accretion.

3. The outer lid of claim 1 , wherein the plurality of electrode ports consists of three electrode ports located within a delta section of the outer lid.

4. The outer lid of claim 1 , wherein the copper alloy is C81100.

5. The outer lid of claim 1 , further comprising a fluid-cooled sleeve for the charge chute.

6. The outer lid of claim 1 , further comprising a plurality of electrode rings, one electrode ring being used in each electrode port.

7. The outer lid of claim 6 , wherein each electrode ring is made from a refractory material selected from the group consisting of zirconia (ZrO 2 ), silicon carbide, alumina (Al 2 O 3 ), silica (SiO 2 ), magnesia (MgO), tungsten carbide, boron nitride, hafnium carbide, tantalum hafnium carbide, chromia (Cr 2 O 3 ), dolomite, and periclase.

8. The outer lid of claim 1 , wherein the bottom surface is flat.

9. An outer lid for an arc furnace, comprising:
a top surface and a bottom surface;
a plurality of electrode ports;
an off-gas chute;
a charge chute; and
a plurality of cooling circuits within the outer lid for flowing a cooling fluid, each cooling circuit comprising an inlet and an outlet, wherein each electrode port has a cooling circuit surrounding it, and at least one cooling circuit runs around an outer perimeter of the outer lid;
wherein the outer lid is made of copper or a copper alloy; and
wherein the outer lid is formed as a base ring section and a delta section, the delta section containing the plurality of electrode ports and the cooling circuits surrounding each electrode port, and the base ring section having an annular shape with a hollow spot in the center and containing the at least one cooling circuit running around the outer perimeter of the outer lid.

10. An arc furnace, comprising:
a crucible; and
a roof comprising an outer lid, wherein the outer lid comprises:
a top surface and a bottom surface;
a plurality of electrode ports;
an off-gas chute;
a charge chute;
a plurality of cooling circuits within the outer lid for flowing a cooling fluid, each cooling circuit comprising an inlet and an outlet, wherein each electrode port has a cooling circuit surrounding it, and at least one cooling circuit runs around an outer perimeter of the outer lid; and
a fluid-cooled sleeve for the off-gas chute, wherein the fluid-cooled sleeve comprises a sidewall and a flange for securing the sleeve to the top surface of the outer lid, the sidewall having a cooling circuit running therethrough designed to deliver water first to a bottom of the sidewall and then flow around the sidewall to a top of the sidewall, and the sleeve having a length sufficient to extend entirely through the off-gas chute;
wherein the outer lid is made of copper or a copper alloy.

11. The arc furnace of claim 10 , wherein the roof further comprises an inner lid comprising carbon.

12. The arc furnace of claim 10 , wherein the plurality of electrode ports consists of three electrode ports located within a delta section of the outer lid.

13. The arc furnace of claim 10 , further comprising a plurality of electrode rings, one electrode ring being used in each electrode port.

14. An arc furnace, comprising:
a crucible; and
a roof comprising an outer lid, wherein the outer lid comprises:
a top surface and a bottom surface;
a plurality of electrode ports;
an off-gas chute;
a charge chute; and
a plurality of cooling circuits within the outer lid for flowing a cooling fluid, each cooling circuit comprising an inlet and an outlet, wherein each electrode port has a cooling circuit surrounding it, and at least one cooling circuit runs around an outer perimeter of the outer lid;

wherein the outer lid is made of copper or a copper alloy; and
wherein the outer lid is formed as a base ring section and a delta section, the delta section containing the plurality of electrode ports and the cooling circuits surrounding each electrode port, and the base ring section having an annular shape with a hollow spot in the center and containing the at least one cooling circuit running around the outer perimeter of the outer lid.

15. The arc furnace of claim 10 , wherein the copper alloy is C81100.

Assignees

• Materion Corp

Inventors

• Goebel Nathan C

Classifications

• F27B3/183

  Charging of arc furnaces vertically through the roof, e.g. in three points · CPC title

• F27B3/085

  Arc furnaces · CPC title

• F27D1/1816

  Removable covers specially adapted for arc furnaces · CPC title

• F27D2009/0018

  the cooling medium passing through a pattern of tubes · CPC title

• F27B3/16 Primary

  Walls; Roofs · CPC title