Roof for electric furnace

Patent metadata

Field	Value
Publication number	US-10132566-B2
Application number	US-201314040369-A
Country	US
Kind code	B2
Filing date	Sep 27, 2013
Priority date	Mar 30, 2011
Publication date	Nov 20, 2018
Grant date	Nov 20, 2018

Abstract

Disclosed herein is a roof for an electric furnace. The roof includes: a small-ceiling seating port (120) which has a small-ceiling seating surface (122) and a small-ceiling support surface (124) that extends from the small-ceiling seating surface inwards and downwards; and a large ceiling (130) which has an upper roof panel (132) that radially extends from the small-ceiling seating port at a downward inclination angle, a lower roof panel (134) disposed below the upper roof panel at a position spaced apart from the upper roof panel, and a side roof panel (136) connected to the upper roof panel and the lower roof panel. The upper roof panel is connected to the outer circumferential surface of the small-ceiling seating port, and the lower roof panel is connected to a lower end of the small-ceiling support surface so that the inclination angle of the lower roof panel can be increased.

First claim

The invention claimed is:

1. A roof for an electric furnace, comprising:
a center-ceiling having electrode holes through which electrode rods are inserted;
a seating port of annular shape that has a center-ceiling seating surface disposed horizontally and a center-ceiling support surface that extends from an inner circumferential edge of the center-ceiling seating surface at an inclined angle in an inward direction and in a downward direction reducing a diameter of the center-ceiling support surface from a top thereof to a bottom; and
an outer-ceiling, wherein the outer-ceiling surrounding the center-ceiling further comprises:
an upper roof panel coupled to an outer circumferential surface having a vertical arrangement of the seating port and radially extends from the seating port at a downward inclination angle;
a lower roof panel disposed below the upper roof panel at a position spaced apart from the upper roof panel by a predetermined distance;
a side roof panel connected to an extension edge of the upper roof panel and to an extension edge of the lower roof panel to enclose the extension edges of the upper and lower roof panels;
a cooling passageway provided within a cavity defined by the side roof panel, the lower roof panel and the upper roof panel;
a plurality of injection pipes radially arranged within the cooling passageway and connected to each other, wherein the injection pipes discharge cooling fluid into the cooling passageway;
a plurality of support rods arranged along a perimeter of the upper roof panel; and
a banister having an inverted-U shape that includes a pair of vertical legs and a horizontal beam that connects upper ends of the vertical legs, wherein lower ends of the vertical legs are configured to be removably inserted into the support rods,
wherein the lower roof panel is connected to a lower end of the center ceiling support surface to increase the inclination angle of the lower roof panel,

wherein a shell that encloses an outer circumferential surface of the center-ceiling contacts the center-ceiling support surface, and a stop protrusion is disposed on the shell and on top of the center-ceiling seating surface, and
wherein a highest point of the injection pipes are disposed below a bottom surface of the center-ceiling.

2. The roof for an electric furnace according to claim 1 , further comprising:
a plurality of slag catchers disposed on the lower roof panel; and
a coating layer and a heat resistance layer successively formed on the lower roof panel that has the plurality of slag catchers.

3. The roof for an electric furnace according to claim 2 , wherein the coating layer is formed of at least one selected from a group consisting of: Aluminum (Al), Nickel (Ni), Chromium (Cr), an Al alloy, a Ni alloy, a Cr alloy and an ultra-heat resistant alloy by spray coating.

4. The roof for an electric furnace according to claim 2 , wherein the heat resistance layer is formed of ceramic that is a heat resistant material by either spray coating or enamel coating.

5. The roof for an electric furnace according to claim 1 , wherein
at least one of the injection pipes is connected to a cooling fluid supply pipe via the side roof panel,
the cooling fluid supply pipe supplies cooling fluid into the cooling passageway, and
cooling fluid injected into the cooling passageway is discharged out of the cooling passageway via a cooling fluid discharge pipe disposed on the side roof panel.

6. The roof for an electric furnace according to claim 1 , further comprising:
a plurality of inspection apertures formed in the upper roof panel at positions that correspond to the respective injection pipes; and
a plurality of inspection aperture covers that cover the respective inspection apertures,
wherein each of the inspection aperture covers are rotatably connected to the upper roof panel by a hinge.

7. The roof for an electric furnace according to claim 1 , further comprising:
a cooling pipe coupled to the support rods to cool heat transferred from the electric furnace, wherein the cooling pipe being horizontally connects one of the support rods to another adjacent support rod,
and a cooling water supply pipe that supplies cooling water into the cooling pipe and a cooling water discharge pipe that discharges the cooling water from the cooling pipe are connected to the cooling pipe.

8. The roof for an electric furnace according to claim 1 , wherein the outer-ceiling further comprises a lift structure, the lift structure including:
a pair of horizontal support arms that extend horizontally from a portion of the upper roof panel adjacent to the seating port towards a perimeter of the upper roof panel;
a pair of vertical support arms disposed on the perimeter of the upper roof panel, wherein the vertical support arms support the horizontal support arms;
a connection block coupled to outer surfaces of the vertical support arms to connect the connection block to a lift cylinder disposed extraneous to the roof when the roof is lifted; and
an anti-dust unit that prevents dust from entering the lift structure.

9. The roof for an electric furnace according to claim 8 , wherein the anti-dust unit includes:
a blocking panel disposed on outer side surfaces of the horizontal support arms and the vertical support arms; and
a blocking cover disposed on upper surfaces of the horizontal support arms, wherein the blocking cover is rotatably coupled to either of the horizontal support arms by a hinge and blocks a space between the horizontal support arms.

Assignees

• Hyundai Steel Co

Inventors

• Lee Sang-Hoon

Classifications

• F27B3/085 Primary

  Arc furnaces · CPC title

• F27B14/12 Primary

  Covers therefor · CPC title

• F27D1/12

  incorporating cooling arrangements · CPC title

• F27D1/025

  Roofs supported around their periphery, e.g. arched roofs · CPC title

• F27B3/16

  Walls; Roofs · CPC title