CA2692082C - 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 PDFInfo
- Publication number
- CA2692082C CA2692082C CA2692082A CA2692082A CA2692082C CA 2692082 C CA2692082 C CA 2692082C CA 2692082 A CA2692082 A CA 2692082A CA 2692082 A CA2692082 A CA 2692082A CA 2692082 C CA2692082 C CA 2692082C
- Authority
- CA
- Canada
- 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
Links
- 238000005245 sintering Methods 0.000 title claims abstract description 41
- 238000001816 cooling Methods 0.000 claims description 14
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- 239000002826 coolant Substances 0.000 claims description 6
- 239000007789 gas Substances 0.000 description 9
- 239000008188 pellet Substances 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 238000001035 drying Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 229910000604 Ferrochrome Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 206010043268 Tension Diseases 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229940020445 flector Drugs 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
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
Abstract
A cover (1) for strand sintering equip-ment (3) provided with a continuous strand sintering track (2). The cover (1) includes a vaulted part (4) that extends on top of the strand sintering track (2).
Description
COVER FOR STRAND SINTERING EQUIPMENT PROVIDED WITH A
CONTINUOUS STRAND SINTERING TRACK
FIELD OF THE INVENTION
The invention relates to a cover for strand sintering equipment having a continuous strand sintering track.
BACKGROUND OF THE INVENTION
Continuous strand sintering is used after pelletizing concentrate powder to agglomerate the pel-lets, 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 sev-eral sequential zones, different temperature condi-tions prevailing in each one of them. The strand sin-tering equipment includes a perforated steel belt, which is directed as an endless loop around two de-flector 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 sinter-ing 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 sin-tering zones and the cooling zones comprise covers
CONTINUOUS STRAND SINTERING TRACK
FIELD OF THE INVENTION
The invention relates to a cover for strand sintering equipment having a continuous strand sintering track.
BACKGROUND OF THE INVENTION
Continuous strand sintering is used after pelletizing concentrate powder to agglomerate the pel-lets, 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 sev-eral sequential zones, different temperature condi-tions prevailing in each one of them. The strand sin-tering equipment includes a perforated steel belt, which is directed as an endless loop around two de-flector 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 sinter-ing 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 sin-tering zones and the cooling zones comprise covers
2 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 ten-sion. Flexural tensile stresses are formed in the pla-nar lining layer, which is why the steel frame that supports the lining must be very stiff, wherefore it becomes extremely heavy.
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 dis-close 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
According to the invention, the cover in-cludes a vaulted part that extends on top of the strand sintering track.
Because of the vault structure, the tensile stresses exerted on the cover become small, and mainly
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 ten-sion. Flexural tensile stresses are formed in the pla-nar lining layer, which is why the steel frame that supports the lining must be very stiff, wherefore it becomes extremely heavy.
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 dis-close 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
According to the invention, the cover in-cludes a vaulted part that extends on top of the strand sintering track.
Because of the vault structure, the tensile stresses exerted on the cover become small, and mainly
3 compression stresses occur in the vault. Thus, it is possible to obtain a lighter cover than before. Fur-thermore, any tensile stresses exerted on the refrac-tory lining become smaller than before and the strength of the lining can be improved.
In one embodiment of the cover, the cover in-cludes side walls and a roof that extends between the side walls, the roof including the said vaulted part.
In one embodiment of the cover, the cover in-cludes a metal frame, which in the area of the vaulted part of the cover is arched like a vault and which in-cludes a lower side on the side of the strand sinter-ing track. The refractory lining is supported by a number of anchoring members to the lower side of the metal frame as a vault-like, arched layer. The metal frame can be made lighter than before, and in the hard and fragile lining that is good in withstanding com-pression but poor in withstanding tension, mainly only minor tensile stresses and mainly compression stresses occur.
In one embodiment of the cover, 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 fur-ther improves the durability of the lining and the an-chor members of the lining.
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 para-bolic arch.
In one embodiment of the cover, the cover in-cludes side walls and a roof that extends between the side walls, the roof including the said vaulted part.
In one embodiment of the cover, the cover in-cludes a metal frame, which in the area of the vaulted part of the cover is arched like a vault and which in-cludes a lower side on the side of the strand sinter-ing track. The refractory lining is supported by a number of anchoring members to the lower side of the metal frame as a vault-like, arched layer. The metal frame can be made lighter than before, and in the hard and fragile lining that is good in withstanding com-pression but poor in withstanding tension, mainly only minor tensile stresses and mainly compression stresses occur.
In one embodiment of the cover, 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 fur-ther improves the durability of the lining and the an-chor members of the lining.
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 para-bolic arch.
4 In one embodiment of the invention, the vault-like part has the shape of an inverted cate-narian curve, i.e., a hyperbolical cosine. No tensile stresses occur in such an ideal vault shape.
In one embodiment of the cover, the cover is the cover of the equalizing zone of the strand sinter-ing equipment.
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, differ-ent temperature conditions prevailing in each one of them. The strand sintering equipment includes a perfo-rated 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 sequen-
In one embodiment of the cover, the cover is the cover of the equalizing zone of the strand sinter-ing equipment.
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, differ-ent temperature conditions prevailing in each one of them. The strand sintering equipment includes a perfo-rated 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 sequen-
5 tial 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 tempera-ture 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 sin-tering 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
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 ap-plication, the vaulted part can be elliptical, have the shape of a parabolic arch or the shape of an in-verted catenarian curve, i.e., a hyperbolic cosine.
The invention is not limited to the above ex-emplary embodiments only, but many variations are pos-sible within the inventive idea defined by the claims.
The invention is not limited to the above ex-emplary embodiments only, but many variations are pos-sible within the inventive idea defined by the claims.
Claims (5)
1. A cover (1) of an equalizing zone (IV) of a strand sintering equipment (3) having a continuous strand sintering track (2), the cover (1) including side walls (5) and a roof (6), extending between the side walls (5) and above the strand sintering track (2), 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) supported by a plurality of anchor elements (10) on the lower side (8) of the metal frame, wherein the roof (6) comprises a vaulted part (4) in the area of which the metal frame (7) and the refractory lining (9) are vault arched, and the metal frame (7) includes a set of coolant channels (11) for cooling the cover with a cooling agent conducted through the set of channels.
2. A cover according to claim 1, wherein the vaulted part (4) is a barrel-vault structure, arched in the lateral direction of the strand sintering track (2), having a centre of curvature on the longitudinal middle plane of the strand sintering track.
3. A cover according to any one of claims 1 to 2, wherein the vaulted part (4) has a cross section shape of a circular segment.
4. A cover according to any one of claims 1 to 3, wherein the vaulted part (4) is one of: an elliptical arch; and a parabolic arch.
5. A cover according to any one of Claims 1 to 4, wherein the vaulted part (4) has the shape of an inverted catenarian curve.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI20075526 | 2007-07-06 | ||
| 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 (2)
| Publication Number | Publication Date |
|---|---|
| CA2692082A1 CA2692082A1 (en) | 2009-01-15 |
| CA2692082C true CA2692082C (en) | 2016-03-29 |
Family
ID=38331614
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2692082A Active CA2692082C (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)
| 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)
| 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 |
-
2007
- 2007-07-06 FI FI20075526A patent/FI119773B/en active IP Right Grant
-
2008
- 2008-07-01 WO PCT/FI2008/050401 patent/WO2009007501A1/en active Application Filing
- 2008-07-01 CN CN2008800236568A patent/CN101688266B/en active Active
- 2008-07-01 AU AU2008274152A patent/AU2008274152B2/en not_active Ceased
- 2008-07-01 BR BRPI0814197A patent/BRPI0814197B8/en active IP Right Grant
- 2008-07-01 CA CA2692082A patent/CA2692082C/en active Active
- 2008-07-01 EA EA200901664A patent/EA018232B1/en not_active IP Right Cessation
- 2008-07-01 EP EP08775526A patent/EP2171107B1/en active Active
-
2010
- 2010-02-03 ZA ZA201000804A patent/ZA201000804B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| AU2008274152B2 (en) | 2012-05-24 |
| FI20075526A (en) | 2009-01-07 |
| EA018232B1 (en) | 2013-06-28 |
| FI20075526A0 (en) | 2007-07-06 |
| ZA201000804B (en) | 2010-10-27 |
| CN101688266A (en) | 2010-03-31 |
| BRPI0814197A2 (en) | 2015-01-27 |
| CA2692082A1 (en) | 2009-01-15 |
| AU2008274152A1 (en) | 2009-01-15 |
| WO2009007501A1 (en) | 2009-01-15 |
| EA200901664A1 (en) | 2010-08-30 |
| BRPI0814197B1 (en) | 2021-09-21 |
| EP2171107B1 (en) | 2012-09-19 |
| EP2171107A4 (en) | 2011-03-02 |
| EP2171107A1 (en) | 2010-04-07 |
| CN101688266B (en) | 2011-07-13 |
| FI119773B (en) | 2009-03-13 |
| BRPI0814197B8 (en) | 2023-03-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| EEER | Examination request |
Effective date: 20121205 |