DE102021003263A1 - Controllable refractory lined door of an electric furnace in sectional construction - Google Patents

Abstract

The invention describes a furnace door which is designed in the form of refractory lined and connected sectional elements, can be moved up and down in an arc and can be positioned steplessly by means of a spindle, linear or cable drive and can be opened in a space-saving manner in approximately horizontal positions approximately in height the gas hood / furnace lid can be moved outside the actual furnace area. The task of the furnace door described is a variable, also partial, opening and closing of the areas of an electric furnace between the furnace platform and gas hood or furnace cover, taking into account the cramped space situation in these areas due to steel construction, furnace parts and media supply lines.

Description

State of the art

In the metal industry, especially for the production of ferrous alloys such as ferrosilicon, electric reduction furnaces, internationally called Submerged Arc Furnace SAF, are used. These furnaces are designed in an open design, in which the surface of the burden is visible from the outside and in which the resulting reducing gases burn on the surface of the burden, and in a closed design, in which the furnaces are hermetically sealed and the reducing gases are used unburned. Not every process allows every type of oven. In order to reduce escaping emissions and to be able to control and regulate the combustion of the reduction gases on the burden surface, or at least to be able to influence them, adjustable furnace doors are increasingly being used, which limit the view into the furnace interior and the supply of combustion air. Such ovens are often referred to as "semi-closed".

Furnace doors of this type must continue to allow access to the furnace for charging and poking the burden surface and also be adjustable in position in order to be able to influence the supply of ambient air (=combustion air).

Out of KR101141320B1 rotating doors are known. Doors that move vertically upwards are known from publications by the companies SMS group GmbH (press release May 4, 2016) and "Stephanie Thiel • Elisabeth Thome-Kozmisky • Daniel Goldmann (ed.): Recycling and raw materials - Volume 11". There are a few horizontal doors in systems, i.e. doors that can be pushed to the side. For electric arc furnaces are off EP2489971A1 Lift-and-fold mechanisms known as slag doors.

description

An oven door (12) is designed based on the shape of a sectional door. The individual sections (3) are guided on a guide frame (1) with guide rollers (6) guided in rails, are provided with refractory and/or insulating material (4) fixed by means of anchors or retaining clips on the inside of the furnace, with metal or ceramic Joints (5) are connected and are moved up and down at the upper end by means of a spindle drive (2) (or an alternative construction such as a cable drive) mechanically and securely connected. The guide frame (1) is designed in such a way that it connects to the gas hood (furnace cover) (7) in the upper area and the door moves horizontally away from the furnace vessel (10) into a holding position when it is raised. All possible positions of the gate's guide construction can be approached steplessly, and a stopping position is possible everywhere at the same time. The anti-trap protection of the gate is positioned in the lower segment on the side facing away from the stove. The construction as a sectional furnace door enables space-saving opening parallel to furnace house platforms and reduces the risk of collisions with steel girders, lines, platforms and/or charging vehicles; especially when retrofitting.

Reference List

1

guide frame

2

Spindle drive (alternatively: linear drive, cable pull)

3

segment car

4

Segment refractory insulation

5

coupling joint

6

leadership role

7

gas hood

8th

Electrodes (here: number 3; also: 1, 2, 9 electrodes)

9

Möller, slag, metal

10

furnace vessel

11

kiln stage

12

oven door

13

engine of the drive

QUOTES INCLUDED IN DESCRIPTION

This list of the documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• KR 101141320 B1 [0003]
• EP 2489971 A1 [0003]

Claims (6)

Furnace door for an electric furnace, characterized in that the furnace door consists of interconnected sections and is guided in a guide frame oven door Claim 1 , characterized in that the sections of the furnace door towards the inside of the furnace are provided with refractory material pan after Claim 1 , characterized in that the furnace door is pushed at an angle of 60° to 100° to the furnace side wall approximately parallel to the furnace cover in a kind of "parking position" when this gate is open pan after Claim 1 and 3 , characterized in that the furnace door is mechanically fixed by a spindle drive or linear drive pan after Claim 1 and 3 , characterized in that the oven door is moved by a cable and its own weight pan after Claim 1 , 3 , 4 and 5 characterized in that the positioning of the oven door can be controlled and regulated.

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