EP2171107B1 - Cover for strand sintering equipment provided with a continuous strand sintering track - Google Patents

Cover for strand sintering equipment provided with a continuous strand sintering track Download PDF

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Publication number
EP2171107B1
EP2171107B1 EP08775526A EP08775526A EP2171107B1 EP 2171107 B1 EP2171107 B1 EP 2171107B1 EP 08775526 A EP08775526 A EP 08775526A EP 08775526 A EP08775526 A EP 08775526A EP 2171107 B1 EP2171107 B1 EP 2171107B1
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EP
European Patent Office
Prior art keywords
cover
strand sintering
track
strand
metal frame
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.)
Active
Application number
EP08775526A
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German (de)
French (fr)
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EP2171107A4 (en
EP2171107A1 (en
Inventor
Janne Ollila
Tom RÖNNBERG
Ari Ceder
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.)
Metso Corp
Original Assignee
Outotec Oyj
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
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Application filed by Outotec Oyj filed Critical Outotec Oyj
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Publication of EP2171107A4 publication Critical patent/EP2171107A4/en
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/16—Sintering; Agglomerating
    • C22B1/20—Sintering; Agglomerating in sintering machines with movable grates
    • 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
    • F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/18—Door frames; Doors, lids, removable covers

Definitions

  • the invention relates to a cover as defined in the preamble of Claim 1.
  • Continuous strand sintering is used after pelletizing concentrate powder to agglomerate the pellets, improving their strength and reactivity.
  • a strand sintering furnace could be mentioned, which is used in the production of ferro-chromium and divided into several sequential zones, different temperature conditions prevailing in each one of them.
  • the strand sintering equipment includes a perforated steel belt, which is directed as an endless loop around two deflector rolls. At the forward end of the furnace, wet fresh pellets are fed onto the steel belt to form a bed with a thickness of a few decimetres.
  • the steel belt conveys the bed of pellets through the drying, heating, and sintering zones of the furnace and to a stabilizing or equalizing zone, after which the bed of pellets further travels through sequential cooling zones.
  • the pellets in a sintered form exit the strand sintering equipment at its tail.
  • the energy contained in the cooling gases of the tail of the furnace is used in drying, heating and sintering at the forward end of the furnace, which is why the strand sintering equipment includes a number of gas ducts to implement the gas circulation mentioned above.
  • the drying, heating, and sintering zones and the cooling zones comprise covers that are provided with gas units. There is no gas unit in the cover of the equalizing zone.
  • the invention relates to the cover of the equalizing zone, which does not have the gas unit, and which in the known technology usually has a structure that includes a cover with side walls and an essentially horizontal flat roof, which extends between the side walls on top of the sintering track.
  • a refractory lining Inside the steel-framed cover, there is a refractory lining.
  • the refractory lining is usually made of heavy ceramic material that withstands high temperatures.
  • the lining is poor in withstanding tension. Flexural tensile stresses are formed in the planar lining layer, which is why the steel frame that supports the lining must be very stiff, wherefore it becomes extremely heavy.
  • SU 1672184 relates to the cover of the sintering machine for use in ferrous metallurgy.
  • the cover includes additional walls set on the lateral walls of the housing.
  • the upper part of the cover has a convex shape.
  • GB 634871 relates to a furnace for a sintering machine having a row of movable pallets.
  • the furnace comprises vertical side walls, and a roof with a refractory lining substantially enclosing the space between the side walls and above the pallets.
  • the roof has an arcuate cross-section.
  • US 4065111 relates to a cover for the ignition frame of a sintering apparatus.
  • the cover includes an enclosed space through which combustion air for the substantially horizontally disposed burners of the sintering apparatus is conducted.
  • the dome cover comprises an inner and an outer shell forming said space therebetween and a refractory lining on the innermost surface of the inner shell.
  • the purpose of the invention is to eliminate the disadvantages mentioned above.
  • the purpose of the invention is to disclose a cover, which enables the use of a lighter skeleton structure of the cover than before.
  • a further purpose of the invention is to disclose a cover, wherein the tensile stresses exerted on the refractory lining are smaller than before and the strength of the lining can be improved.
  • the cover according to the invention is characterized in that which is presented in Claim 1.
  • the roof is a vaulted part in the area of which the metal frame and the refractory lining are arched like a vault
  • the metal frame includes a set of coolant channels for cooling the cover with a cooling intermediate agent conducted through the set of coolant channels.
  • the cooling further improves the durability of the lining and the anchor members of the lining.
  • the tensile stresses exerted on the cover become small, and mainly compression stresses occur in the vault.
  • any tensile stresses exerted on the refractory lining become smaller than before and the strength of the lining can be improved.
  • the metal frame can be made lighter than before, and in the hard and fragile lining that is good in withstanding compression but poor in withstanding tension, mainly only minor tensile stresses and mainly compression stresses occur.
  • the vault-like part is an arched barrel-vault structure in the lateral direction of the strand sintering track, its centre of curvature being in the longitudinal middle plane of the strand sintering track.
  • the vault-like part has a cross section of the shape of a circle segment.
  • the vault-like part is elliptical or has the shape of a parabolic arch.
  • the vault-like part has the shape of an inverted catenarian curve, i.e., a hyperbolical cosine. No tensile stresses occur in such an ideal vault shape.
  • Fig. 1 shows an example of an application of the cover, which is a strand sintering furnace that is used in the production of ferro-chromium and which is divided into several sequential zones I - VII, different temperature conditions prevailing in each one of them.
  • the strand sintering equipment includes a perforated steel belt 12, which is conveyed as an endless loop around two deflector rolls 13 an 14, at least one of which being a used roll. Wet fresh pellets are fed at the forward end of the furnace (left in the figure) on top of the steel belt 12 to form a bed with a thickness of several decimetres.
  • the steel belt 12 carries the bed of pellets through the drying zone (I, a temperature of about 350°C), the heating zone (II, a temperature of about 1150°C), and the sintering zone (III, a temperature of about 1350°C) of the furnace to the stabilizing or equalizing zone (IV), after which the bed of pellets further travels through a sequential first cooling zone (V, a temperature of about 1250°C), second cooling zone (VI, a temperature of about 1150°C) and third cooling zone (VII, a temperature of about 400°C).
  • V first cooling zone
  • VI a temperature of about 1150°C
  • VI a temperature of about 400°C
  • the strand sintering equipment includes a number of gas ducts 15, 16, 17 to implement the gas circulation mentioned above.
  • the drying, heating and sintering zones as well as the cooling zones comprise covers that are provided with gas units. There is no gas unit in the cover 1 of the equalizing zone.
  • the cross-sectional drawing of Fig. 2 comprises the cover 1 of the equalizing zone IV, comprising a vaulted part 4 that extends on top of the strand sintering track 2.
  • Cover 1 includes side walls 5 and a roof 6, which forms the vaulted part 4 and extends between the side walls 5.
  • Cover 1 includes a metal frame 7, which in the area of the vaulted part 4 of the cover is arched like a vault.
  • a refractory lining 9 is supported by a number of anchor elements 10 (see Fig. 4 ) to the lower side 8 of the metal frame 7 as a uniform layer that is arched like a vault. As seen in Figs.
  • the metal frame 7 comprises, in the area of both the roof 6 and the side walls 5, sets of coolant channels 11 for cooling the cover 1 with the cooling intermediate agent that is conducted through the sets of coolant channels.
  • the vaulted roof 6 is a barrel-vault structure, which is arched in the lateral direction of the strand sintering track 2, its cross section having the shape of a circle segment, and its centre of curvature being on the longitudinal middle plane of the strand sintering track 2.
  • the vaulted part can be elliptical, have the shape of a parabolic arch or the shape of an inverted catenarian curve, i.e., a hyperbolic cosine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Metallurgy (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Tunnel Furnaces (AREA)
  • Powder Metallurgy (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Belt Conveyors (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)

Description

    FIELD OF THE INVENTION
  • The invention relates to a cover as defined in the preamble of Claim 1.
    • BACKGROUND OF THE INVENTION
  • Continuous strand sintering is used after pelletizing concentrate powder to agglomerate the pellets, improving their strength and reactivity. As an example of the strand sintering technique, a strand sintering furnace could be mentioned, which is used in the production of ferro-chromium and divided into several sequential zones, different temperature conditions prevailing in each one of them. The strand sintering equipment includes a perforated steel belt, which is directed as an endless loop around two deflector rolls. At the forward end of the furnace, wet fresh pellets are fed onto the steel belt to form a bed with a thickness of a few decimetres. The steel belt conveys the bed of pellets through the drying, heating, and sintering zones of the furnace and to a stabilizing or equalizing zone, after which the bed of pellets further travels through sequential cooling zones. After travelling through the cooling zones, the pellets in a sintered form exit the strand sintering equipment at its tail. To optimize the energy economy, the energy contained in the cooling gases of the tail of the furnace is used in drying, heating and sintering at the forward end of the furnace, which is why the strand sintering equipment includes a number of gas ducts to implement the gas circulation mentioned above. For this purpose, the drying, heating, and sintering zones and the cooling zones comprise covers that are provided with gas units. There is no gas unit in the cover of the equalizing zone.
  • In particular, the invention relates to the cover of the equalizing zone, which does not have the gas unit, and which in the known technology usually has a structure that includes a cover with side walls and an essentially horizontal flat roof, which extends between the side walls on top of the sintering track. Inside the steel-framed cover, there is a refractory lining. The refractory lining is usually made of heavy ceramic material that withstands high temperatures. Furthermore, the lining is poor in withstanding tension. Flexural tensile stresses are formed in the planar lining layer, which is why the steel frame that supports the lining must be very stiff, wherefore it becomes extremely heavy.
  • SU 1672184 relates to the cover of the sintering machine for use in ferrous metallurgy. The cover includes additional walls set on the lateral walls of the housing. The upper part of the cover has a convex shape.
  • GB 634871 relates to a furnace for a sintering machine having a row of movable pallets. The furnace comprises vertical side walls, and a roof with a refractory lining substantially enclosing the space between the side walls and above the pallets. The roof has an arcuate cross-section.
  • US 4065111 relates to a cover for the ignition frame of a sintering apparatus. The cover includes an enclosed space through which combustion air for the substantially horizontally disposed burners of the sintering apparatus is conducted. The dome cover comprises an inner and an outer shell forming said space therebetween and a refractory lining on the innermost surface of the inner shell.
    • THE PURPOSE OF THE INVENTION
  • The purpose of the invention is to eliminate the disadvantages mentioned above.
  • In particular, the purpose of the invention is to disclose a cover, which enables the use of a lighter skeleton structure of the cover than before.
  • A further purpose of the invention is to disclose a cover, wherein the tensile stresses exerted on the refractory lining are smaller than before and the strength of the lining can be improved.
    • SUMMARY OF THE INVENTION
  • The cover according to the invention is characterized in that which is presented in Claim 1.
  • According to the invention, the roof is a vaulted part in the area of which the metal frame and the refractory lining are arched like a vault, and the metal frame includes a set of coolant channels for cooling the cover with a cooling intermediate agent conducted through the set of coolant channels. The cooling further improves the durability of the lining and the anchor members of the lining.
  • Because of the vault structure, the tensile stresses exerted on the cover become small, and mainly compression stresses occur in the vault. Thus, it is possible to obtain a lighter cover than before. Furthermore, any tensile stresses exerted on the refractory lining become smaller than before and the strength of the lining can be improved.
  • The metal frame can be made lighter than before, and in the hard and fragile lining that is good in withstanding compression but poor in withstanding tension, mainly only minor tensile stresses and mainly compression stresses occur.
  • In one embodiment of the cover, the vault-like part is an arched barrel-vault structure in the lateral direction of the strand sintering track, its centre of curvature being in the longitudinal middle plane of the strand sintering track.
  • In one embodiment of the cover, the vault-like part has a cross section of the shape of a circle segment.
  • In one embodiment of the cover, the vault-like part is elliptical or has the shape of a parabolic arch.
  • In one embodiment of the invention, the vault-like part has the shape of an inverted catenarian curve, i.e., a hyperbolical cosine. No tensile stresses occur in such an ideal vault shape.
    • LIST OF FIGURES
  • In the following, the invention is described in detail by means of exemplary embodiments and with reference to the appended drawing, in which
    • Fig. 1 shows schematically a side view of the strand sintering equipment comprising an embodiment of the cover according to the invention,
    • Fig. 2 shows the cross section II-II of the strand sintering equipment of Fig. 1,
    • Fig. 3 shows a perspective view of the cover of Fig. 3, and
    • Fig. 4 shows the section IV-IV of Fig. 3.
    DETAILED DESCRIPTION OF THE INVENTION
  • Fig. 1 shows an example of an application of the cover, which is a strand sintering furnace that is used in the production of ferro-chromium and which is divided into several sequential zones I - VII, different temperature conditions prevailing in each one of them. The strand sintering equipment includes a perforated steel belt 12, which is conveyed as an endless loop around two deflector rolls 13 an 14, at least one of which being a used roll. Wet fresh pellets are fed at the forward end of the furnace (left in the figure) on top of the steel belt 12 to form a bed with a thickness of several decimetres. The steel belt 12 carries the bed of pellets through the drying zone (I, a temperature of about 350°C), the heating zone (II, a temperature of about 1150°C), and the sintering zone (III, a temperature of about 1350°C) of the furnace to the stabilizing or equalizing zone (IV), after which the bed of pellets further travels through a sequential first cooling zone (V, a temperature of about 1250°C), second cooling zone (VI, a temperature of about 1150°C) and third cooling zone (VII, a temperature of about 400°C). After travelling through the cooling zones, the pellets in the sintered form exit the strand sintering equipment at its tail. The strand sintering equipment includes a number of gas ducts 15, 16, 17 to implement the gas circulation mentioned above. For this purpose, the drying, heating and sintering zones as well as the cooling zones comprise covers that are provided with gas units. There is no gas unit in the cover 1 of the equalizing zone.
  • Referring to Figs. 2 to 4, the cross-sectional drawing of Fig. 2 comprises the cover 1 of the equalizing zone IV, comprising a vaulted part 4 that extends on top of the strand sintering track 2. Cover 1 includes side walls 5 and a roof 6, which forms the vaulted part 4 and extends between the side walls 5. Cover 1 includes a metal frame 7, which in the area of the vaulted part 4 of the cover is arched like a vault. A refractory lining 9 is supported by a number of anchor elements 10 (see Fig. 4) to the lower side 8 of the metal frame 7 as a uniform layer that is arched like a vault. As seen in Figs. 2 and 3, the metal frame 7 comprises, in the area of both the roof 6 and the side walls 5, sets of coolant channels 11 for cooling the cover 1 with the cooling intermediate agent that is conducted through the sets of coolant channels. As seen in Fig. 2, the vaulted roof 6 is a barrel-vault structure, which is arched in the lateral direction of the strand sintering track 2, its cross section having the shape of a circle segment, and its centre of curvature being on the longitudinal middle plane of the strand sintering track 2. In another application, the vaulted part can be elliptical, have the shape of a parabolic arch or the shape of an inverted catenarian curve, i.e., a hyperbolic cosine.
  • The invention is not limited to the above exemplary embodiments only, but many variations are possible within the inventive idea defined by the claims.

Claims (5)

  1. A cover (1) of the equalizing zone (IV) of a strand sintering equipment (3) provided with a continuous strand sintering track (2), the cover (1) including side walls (5) and a roof (6), which extends between the side walls (5) and above the strand sintering track (2), and the cover (1) further including a metal frame (7) having a lower side (8) on the side of the strand sintering track, and a refractory lining (9), which is supported by a number of anchor elements (10) to the lower side (8) of the metal frame, characterized in that the roof (6) is a vaulted part (4) in the area of which the metal frame (7) and the refractory lining (9) are arched like a vault, and
    that the metal frame (7) includes a set of coolant channels (11) for cooling the cover with a cooling intermediate agent that is conducted through the set of channels.
  2. A cover according to Claim 1, characterized in that the vaulted part (4) is a barrel-vault structure, which is arched in the lateral direction of the strand sintering track (2), its centre of curvature being on the longitudinal middle plane of the strand sintering track.
  3. A cover according to Claim 1 or 2, characterized in that the vaulted part (4) has a cross section of the shape of a circle segment.
  4. A cover according to any of Claims 1 to 3, characterized in that the vaulted part (4) is elliptical or has the shape of a parabolic arch.
  5. A cover according to any of Claims 1 to 4, characterized in that the vaulted part (4) has the shape of an inverted catenarian curve, i.e., a hyperbolic cosine.
EP08775526A 2007-07-06 2008-07-01 Cover for strand sintering equipment provided with a continuous strand sintering track Active EP2171107B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20075526A FI119773B (en) 2007-07-06 2007-07-06 Cover for continuous belt sintering equipment
PCT/FI2008/050401 WO2009007501A1 (en) 2007-07-06 2008-07-01 Cover for strand sintering equipment provided with a continuous strand sintering track

Publications (3)

Publication Number Publication Date
EP2171107A1 EP2171107A1 (en) 2010-04-07
EP2171107A4 EP2171107A4 (en) 2011-03-02
EP2171107B1 true EP2171107B1 (en) 2012-09-19

Family

ID=38331614

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08775526A Active EP2171107B1 (en) 2007-07-06 2008-07-01 Cover for strand sintering equipment provided with a continuous strand sintering track

Country Status (9)

Country Link
EP (1) EP2171107B1 (en)
CN (1) CN101688266B (en)
AU (1) AU2008274152B2 (en)
BR (1) BRPI0814197B8 (en)
CA (1) CA2692082C (en)
EA (1) EA018232B1 (en)
FI (1) FI119773B (en)
WO (1) WO2009007501A1 (en)
ZA (1) ZA201000804B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI121927B (en) * 2009-08-04 2011-06-15 Outotec Oyj PROCEDURE AND BAND SINTERING SYSTEM FOR CONTINUOUS SINTERING OF PELLETERED MINERAL MATERIAL

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB634871A (en) * 1943-03-31 1950-03-29 Mckee & Co Arthur G Ignition furnace for sintering machines
FI751192A (en) * 1975-04-22 1976-10-23 Ovako Oy
SU662787A1 (en) * 1977-03-09 1979-05-15 Всесоюзный Научно-Исследовательский И Проектный Институт По Очистке Технологических Газов, Сточных Вод И Использованию Вторичных Энергоресурсов Предприятий Черной Металлургии Sintering machine shelter
JPS6134121A (en) * 1984-07-26 1986-02-18 Nisshin Steel Co Ltd Method for operating sintering apparatus
SU1672184A1 (en) * 1989-03-31 1991-08-23 Кузнецкий металлургический комбинат им.В.И.Ленина Shed of sintering machine

Also Published As

Publication number Publication date
BRPI0814197B1 (en) 2021-09-21
FI20075526A (en) 2009-01-07
ZA201000804B (en) 2010-10-27
EA018232B1 (en) 2013-06-28
AU2008274152A1 (en) 2009-01-15
EA200901664A1 (en) 2010-08-30
FI20075526A0 (en) 2007-07-06
FI119773B (en) 2009-03-13
CN101688266B (en) 2011-07-13
EP2171107A4 (en) 2011-03-02
CN101688266A (en) 2010-03-31
EP2171107A1 (en) 2010-04-07
WO2009007501A1 (en) 2009-01-15
CA2692082A1 (en) 2009-01-15
AU2008274152B2 (en) 2012-05-24
CA2692082C (en) 2016-03-29
BRPI0814197B8 (en) 2023-03-28
BRPI0814197A2 (en) 2015-01-27

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