CHANNEL-TYPE INDUCTION FURNACE

• US 3,618,917 A
• Filed: 02/09/1970
• Issued: 11/09/1971
• Est. Priority Date: 02/20/1969
• Status: Expired due to Term

• Current Assignee: Bengt Fredrikson, Kare Folgero, Sven Hellsing
• Original Assignee: Bengt Fredrikson, Kare Folgero, Sven Hellsing
• Inventors: Fredrikson, Bengt, Hellsing, Sven, Folgero, Kare
• Primary Examiner(s): Dost, Gerald A.
• Application Number:
  US05/009,705
• Time in Patent Office: 638 Days
• Field of Search: 266/24,33R,34R,34A,34T,34PP,34PT 13/26,28,29,30
• US Class Current: 266/220
• CPC Class Codes: C21C 5/5241 in an inductively heated furnace
• CPC Class Codes: C22B 4/00 Electrothermal treatment of ores or metallurgical products for obtaining metals or alloys obtaining iron or steel C21B, C21C
• CPC Class Codes: H05B 6/20 having melting channel only
• CPC Class Codes: Y02P 10/25 Process efficiency

Abstract

A channel-type induction furnace has one or more inductors, a bottom channel beneath the inductor or inductors and side channels connecting the bottom channel to the hearth. In the case of more than one inductor, there is also at least one central channel running between the inductors. Nozzles are provided openings into the bottom channel opposite the side and central channels for the supply of inert and/or active gas into the channels to modify the flow therein and to carry to the top of the melt various impurities.

Claims

1. Channel-type induction furnace having at least one inductor, comprising at least two side channels leading from the furnace hearth and one bottom channel joining the parts of the side channels facing away from the hearth, gas supply means comprising at least one nozzle located under each side channel to blow in gas.

2. Channel-type induction furnace according to claim 1, in which the gas supply means includes means to supply to the nozzle an inert gas and a gas which reacts with parts of the furnace contents.

3. Channel-type induction furnace according to claim 1, in which said gas nozzle comprises a porous body to allow gas to pass through into the melt channels.

4. Channel-type induction furnace according to claim 1, in which the gas supply means includes at least two nozzles opening into different parts of the bottom channel, aNd adjustable means to allow a greater or smaller gas quantity to flow to one part of the bottom channel than to another part of said channel in order to effect uniform bath movement and gas flow in all parts of the channel.

5. Channel-type induction furnace according to claim 1, in which the number of channels between the bottom channel and the hearth is three and the gas supply means comprises a middle gas nozzle directed in the longitudinal direction of the middle channel.

6. Channel-type induction furnace having at least one inductor comprising at least two side channels and at least one central channel leading from the furnace hearth and one bottom channel joining the parts of said channels facing away from the hearth, at least one nozzle arranged under said central channel in said bottom channel for gas-flow into said central channel, and a nozzle arranged under each of said side channels for gas flow into the last-mentioned channels.

7. Channel-type induction furnace according to claim 6, in which the flow towards the central channel is greater than the flow against the side channels in order to obtain a bath movement directed substantially from the hearth in the central channel and a bath movement substantially towards the hearth in the outer channels.

8. Channel-type induction furnace according to claim 6, in which the flow towards the central channel is smaller than the flow towards the side channels in order to obtain a bath movement directed substantially towards the hearth in the central channel and substantially away from the hearth in the side channels.

9. Channel-type induction furnace in accordance with claim 6, in which the number of central channels is at least two, at least one nozzle being arranged in the bottom channel opposite each side and central channel, each inlet being adjustable in order to obtain a desired flow pattern.