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WO2015068132A1 - Four à induction à boucle simple - Google Patents

Four à induction à boucle simple Download PDF

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Publication number
WO2015068132A1
WO2015068132A1 PCT/IB2014/065874 IB2014065874W WO2015068132A1 WO 2015068132 A1 WO2015068132 A1 WO 2015068132A1 IB 2014065874 W IB2014065874 W IB 2014065874W WO 2015068132 A1 WO2015068132 A1 WO 2015068132A1
Authority
WO
WIPO (PCT)
Prior art keywords
furnace
passage
induction heater
channel
hearth
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IB2014/065874
Other languages
English (en)
Inventor
Louis Johannes Fourie
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of WO2015068132A1 publication Critical patent/WO2015068132A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B14/00—Crucible or pot furnaces
    • F27B14/06—Crucible or pot furnaces heated electrically, e.g. induction crucible furnaces with or without any other source of heat
    • F27B14/061—Induction furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B14/00—Crucible or pot furnaces
    • F27B14/08—Details specially adapted for crucible or pot furnaces

Definitions

  • This invention relates to channel type induction furnaces used in the melting or smelting of metals and particularly to induction furnaces used in smelting particulate materials floating on the surface of metal and slag in a furnace hearth.
  • single loop inductors are connected to the metal bath of an induction heated furnace for heating it by one single large opening or throat. Heated metal from the inductor rises through the throat opening while cooler metal from the bath flows down to the inductor.
  • This arrangement leads to local overheating when a shallow metal bath with large surface area is used. A large surface area and shallow bath is required for best efficiency when particulate material which floats on the metal bath surface is being melted.
  • Single loop inductors offer advantages of lower energy losses, simpler construction and lower refractory and fabrication costs, but conventionally cannot be used with a shallow and large bath surface area.
  • a single loop channel type induction furnace comprising a shell lined with refractory material, and having a floor and a wall extending from the floor to form a hearth, at least one single loop channel type induction heater associated with the furnace and in fluid communication with the hearth by means of a throat in the floor, the throat including two throat passages each of which is in fluid communication with the induction heater channel, the throat passages including an inlet passage for flow of metal from the hearth to the induction heater channel and an outlet passage for flow of metal from the induction heater channel to the hearth, with the inlet passage having a larger cross sectional area than the outlet passage.
  • At least the inlet passage and preferably also for the outlet passage, to be configured to connect tangentially with the induction heater channel.
  • the furnace to be provided with a plurality of single loop channel type induction heaters, and for the induction heater channels to be arranged in line or at right angles to each other, alternatively circumferentially spaced around the wall of the furnace.
  • outlet passage to be directed away from the inlet passage, and preferably for the inlet passage to be formed to extend substantially vertically between the hearth and the induction heater channel, and for the outlet passage to extend at least for part of its length, preferably including the part of its length that includes the termination thereof at the floor, at an angle away from the inlet passage.
  • Figure 1 is an end view of a channel and throat passage assembly of a furnace according to the invention; is an end view of an assembly as shown in Figure 1 which also includes a starter passage, in a rectangular furnace, with all refractory material transparent;
  • FIG. 1 is a perspective end view of the furnace of Figure 2 from the opposing end side with the end wall removed for clarity;
  • FIG. 1 is a side view of the furnace of Figure 2;
  • FIG. 1 is a side view of a rectangular furnace with two channel and throat passage assemblies according to the invention, with all refractory material transparent; is a top perspective view of a circular furnace with a channel and throat passage assembly according to the invention, with all refractory material transparent;
  • FIG. 1 is a top perspective view of a circular furnace with three circumferentially spaced apart channel and throat passage assemblies according to the invention, with all refractory material transparent;
  • FIG. 9 is an end view of a drum furnace with a channel and throat passage assembly according to the invention, with all refractory material transparent; is a side view of the furnace of Figure 9;
  • FIG. 1 is an end view of another drum furnace with a channel and throat passage assembly according to the invention, with all refractory material transparent;
  • FIG. 1 is a side view of the furnace of Figure 1 1 .
  • the invention provides for a single loop induction heated furnace that includes a shell lined with refractory material, and having a floor and a wall extending from the floor to form a hearth.
  • the furnace includes at least one single loop channel type induction heater associated with it and this induction heater is in fluid communicating with the hearth by means of a throat in the floor.
  • the throat comprises two throat passages each of which is in communication with the induction heater channel.
  • the throat passages include an inlet passage for flow of metal from the hearth to the induction heater channel and an outlet passage for flow of metal from the induction heater channel to the hearth, with the inlet passage having a larger cross sectional area than the outlet passage.
  • the general arrangement of the channel (1 ) and the throat passages (2, 3) of a furnace according to the invention is shown in Figure 1 .
  • the channel (1 ) comprises a circular coil with a circular cross-section that acts as a secondary coil for the induction heater.
  • the primary coil (not shown) is located coaxially within the coil in known manner.
  • Figure 1 relates to an induction furnace in general terms, and then in more detail with reference to Figures 2 to 12 with various specific embodiments of the furnace shape and heating arrangement.
  • the channel (1 , 1 1 , 17) and the portions of the passages (2, 3, 17), that extend below the furnace are formed within a bulk of refractory material.
  • this refractory material below the furnace is not shown in any of the drawings.
  • the throat comprises two passages, namely the inlet passage (2) and the outlet passage (3).
  • the inlet passage (2) commences at floor level (4) in the hearth and extends substantially vertical down from the floor to the channel (1 ), to which it is tangentially connected (5).
  • the outlet passage extends from the channel (1 ), also tangentially (6), and terminates in a raised portion of the floor (7). It has a first section (8) that is arranged substantially vertical, and a longer second section (9) that is angled away from the inlet passage (2).
  • the outlet passage (3) terminates in the floor of the furnace, on a higher level than the inlet passage (2), on a raised portion (34) of the floor. This difference in height is not per se crucial for the functioning of the furnace, but it is beneficial for the prevention of short- circuiting of metal flow in the furnace.
  • the inlet passage (2) has a larger cross sectional area compared to the outlet passage (3).
  • the hearth of the furnace is filled with liquid metal which circulates through the induction heater for heating. Cooler metal is drawn into the channel (1 ) via the inlet passage (2). Heated metal flows from the channel (1 ) to the hearth via the outlet passage (3).
  • the starter passage (10) allows communication between outlet passage (12) and inlet passage (1 1 ) for use during start-up of the furnace, in cases such as in this embodiment where the outlet passage (12) terminates on a higher level (34) in the floor than the level at which the inlet passage (1 1 ) commences. In this embodiment, flow becomes possible when the bath level reaches the level of the starter passage (10).
  • the floor of the furnace (22) is provided with a trench (26) for each outlet passage (22) that extends circumferentially away from each outlet passage (23), and each trench (26) terminates in a ramp (27). This controls the flow of metal in front of each outlet passage (23) and directs it away from its inlet passage (24).
  • the heater and passage arrangement (28) may be installed with the central axis of the induction heater channel (29) aligned with the longitudinal central axis of the drum furnace (30), as shown in Figures 9 and 10.
  • the heater and passage arrangement (31 ) may also be installed with the central axis of the induction heater channel (32) transverse with the longitudinal central axis of the drum furnace (33), as shown in Figures 1 1 and 12.
  • the channel (1 ) may for example comprise a coil with a non-circular cross-section, for example oval, rectangular and so forth.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)

Abstract

La présente invention concerne un four à induction à canal à boucle unique, comprenant une carcasse revêtue d'un matériau réfractaire et présentant un fond et une paroi s'étendant à partir du fond pour former un creuset, et au moins un élément de chauffe à induction du type à canal à boucle unique associé au four et en communication fluidique avec le creuset par l'intermédiaire d'une gorge ménagée dans le fond, ladite gorge comprenant deux passages dont chacun est en communication fluidique avec le canal (1) de l'élément de chauffe à induction. Lesdits passages de gorge comprennent un passage d'entrée (2) pour l'écoulement du métal à partir du creuset vers le canal (1) d'élément de chauffe à induction et un passage de sortie (3) pour l'écoulement du métal à partir du canal (1) d'élément de chauffe à induction vers le creuset, ledit passage d'entrée (2) présentant une superficie en coupe supérieure à celle du passage de sortie (3).
PCT/IB2014/065874 2013-11-07 2014-11-07 Four à induction à boucle simple Ceased WO2015068132A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA2013/07212 2013-11-07
ZA201307212 2013-11-07

Publications (1)

Publication Number Publication Date
WO2015068132A1 true WO2015068132A1 (fr) 2015-05-14

Family

ID=53040978

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2014/065874 Ceased WO2015068132A1 (fr) 2013-11-07 2014-11-07 Four à induction à boucle simple

Country Status (1)

Country Link
WO (1) WO2015068132A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016209906A1 (fr) * 2015-06-23 2016-12-29 Smalley Daniel S Four à induction à circulation améliorée du métal fondu
US10852064B2 (en) * 2015-07-15 2020-12-01 Envirosteel Inc Channel type induction furnace

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA232652A (fr) * 1923-07-10 The Ajax Metal Company Four a induction
US3092682A (en) * 1960-03-24 1963-06-04 Ajax Magnethermic Corp Submerged resistor type induction furnaces and methods and processes therefor
US4170713A (en) * 1977-04-07 1979-10-09 Butseniex Imant E Channel-type induction furnace
US4580273A (en) * 1983-07-27 1986-04-01 Giuseppe Crescenzi Electrical induction crucible furnace for die casting

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA232652A (fr) * 1923-07-10 The Ajax Metal Company Four a induction
US3092682A (en) * 1960-03-24 1963-06-04 Ajax Magnethermic Corp Submerged resistor type induction furnaces and methods and processes therefor
US4170713A (en) * 1977-04-07 1979-10-09 Butseniex Imant E Channel-type induction furnace
US4580273A (en) * 1983-07-27 1986-04-01 Giuseppe Crescenzi Electrical induction crucible furnace for die casting

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016209906A1 (fr) * 2015-06-23 2016-12-29 Smalley Daniel S Four à induction à circulation améliorée du métal fondu
US10852064B2 (en) * 2015-07-15 2020-12-01 Envirosteel Inc Channel type induction furnace

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