JPH11293317A - Mechanism for charging pellet into rotary hearth furnace - Google Patents
Mechanism for charging pellet into rotary hearth furnaceInfo
- Publication number
- JPH11293317A JPH11293317A JP11595598A JP11595598A JPH11293317A JP H11293317 A JPH11293317 A JP H11293317A JP 11595598 A JP11595598 A JP 11595598A JP 11595598 A JP11595598 A JP 11595598A JP H11293317 A JPH11293317 A JP H11293317A
- Authority
- JP
- Japan
- Prior art keywords
- pellets
- rotary hearth
- passage
- pellet
- furnace
- 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.)
- Granted
Links
Landscapes
- Manufacture Of Iron (AREA)
- Tunnel Furnaces (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は回転床炉へのペレッ
ト投入機構に関する。製鋼ダストや粉鉱等に含まれる金
属酸化物を金属化する場合、これらを還元材や通常はバ
インダと共に混練、造粒してペレットとなし、このペレ
ットを回転床炉へ投入して、該ペレット中の金属酸化物
を加熱、還元することが行なわれる。本発明はかかる回
転床炉へのペレット投入機構の改善に関する。The present invention relates to a mechanism for feeding pellets into a rotary bed furnace. When metallizing metal oxides contained in steelmaking dust or fine ore, these are kneaded with a reducing agent and usually a binder, granulated to form pellets, and the pellets are charged into a rotary bed furnace to form the pellets. Heating and reduction of the metal oxide therein is performed. The present invention relates to an improvement in a mechanism for feeding pellets into such a rotary hearth furnace.
【０００２】[0002]
【従来の技術】従来、上記のような回転床炉として、炉
内に皿状の回転炉床及びこの回転炉床に近接して抽出機
構、例えば水冷スクリューを装備し、炉壁に複数のバー
ナを取り付けたものが使用されている（特公昭６４−５
２３３、特開平８−３３７８２７）。このような回転床
炉では、投入機構によりペレットを炉内の回転炉床上へ
連続投入し、投入したペレットが回転炉床の回転により
抽出機構へと到るまでの間に、該ペレット中の金属酸化
物をバーナの火炎で加熱し、同伴する還元材で還元し
て、生成した金属を抽出機構で連続抽出するようになっ
ている。そしてかかる回転床炉へのペレット投入機構と
しては、ピボットコンベヤ、シャトルコンベヤ、振動コ
ンベヤ等が使用されている。ところが、これら従来のペ
レット投入機構には、回転炉床上へ投入したペレットの
厚みが、回転炉床の外周部と内周部とで異なるという問
題がある。2. Description of the Related Art Conventionally, as a rotary hearth furnace as described above, a dish-shaped rotary hearth and an extraction mechanism, for example, a water-cooled screw are provided in the furnace in the vicinity of the rotary hearth, and a plurality of burners are provided on the furnace wall. Is used. (Japanese Patent Publication No. 64-5)
233, JP-A-8-337827). In such a rotary hearth furnace, the pellets are continuously charged onto the rotary hearth in the furnace by the charging mechanism, and the metal in the pellets is moved before the charged pellets reach the extraction mechanism by rotation of the rotary hearth. The oxide is heated by the flame of the burner, reduced by the accompanying reducing agent, and the produced metal is continuously extracted by the extraction mechanism. A pivot conveyor, a shuttle conveyor, a vibrating conveyor, or the like is used as a mechanism for feeding pellets to the rotary bed furnace. However, these conventional pellet charging mechanisms have a problem that the thickness of the pellets charged on the rotary hearth differs between the outer peripheral portion and the inner peripheral portion of the rotary hearth.
【０００３】例えば振動コンベヤでペレットを投入する
場合、そのトラフに回転炉床の幅に亘るスリットを設
け、このスリットから直下の回転炉床上へ投入する場合
と、トラフの先端部を回転炉床の幅に亘り配置し、この
先端部から直下の回転炉床上へ投入する場合とがある
が、どちらの場合もペレットはトラフ上をほぼ均一に流
れるので、単位時間当たりのペレット投入量は、回転炉
床の外周部と内周部とでほぼ同じになる。しかし、回転
炉床の周速度は、外周部と内周部とで異なり、外周部は
相対的に速く、内周部は相対的に遅いので、単位時間当
たりのペレット投入量が同じであると、外周部へ投入し
たペレットの厚みは相対的に薄くなり、内周部へ投入し
たペレットの厚みは相対的に厚くなるのである。回転炉
床上へ投入したペレットの厚みが、回転炉床の外周部と
内周部とで異なると、ペレット中の金属酸化物の加熱、
還元が均一になされず、外周部では加熱、還元が充分に
進んでも、内周部では加熱、還元が不充分になってしま
うという不都合が生じる。[0003] For example, when pellets are charged by a vibrating conveyor, a slit is provided in the trough over the width of the rotary hearth, and when the pellet is charged onto the rotary hearth immediately below the slit, the tip of the trough is connected to the rotary hearth. In some cases, the pellets flow almost uniformly over the trough, and the amount of pellets charged per unit time is limited by the rotary furnace. The outer circumference and the inner circumference of the floor are almost the same. However, the peripheral speed of the rotary hearth is different between the outer peripheral portion and the inner peripheral portion, the outer peripheral portion is relatively fast, and the inner peripheral portion is relatively slow, so that the pellet input amount per unit time is the same. The thickness of the pellets injected into the outer peripheral portion becomes relatively thin, and the thickness of the pellets injected into the inner peripheral portion becomes relatively thick. When the thickness of the pellets put on the rotary hearth is different between the outer peripheral portion and the inner peripheral portion of the rotary hearth, heating of the metal oxide in the pellets,
The reduction is not uniform, and even if heating and reduction proceed sufficiently in the outer peripheral portion, there is a disadvantage that heating and reduction are insufficient in the inner peripheral portion.
【０００４】[0004]
【発明が解決しようとする課題】本発明が解決しようと
する課題は、従来のペレット投入機構では、回転炉床上
へ投入したペレットの厚みが、外周部と内周部とで異な
り、不均一になる点である。The problem to be solved by the present invention is that in the conventional pellet charging mechanism, the thickness of the pellets charged on the rotary hearth is different between the outer peripheral portion and the inner peripheral portion, and is uneven. It is a point.
【０００５】[0005]
【課題を解決するための手段】上記の課題を解決する本
発明は、回転炉床上へ投入したペレット中の金属酸化物
を加熱、還元する回転床炉へのペレット投入機構であっ
て、ペレットを回転炉床上へ投入する振動コンベヤのト
ラフに該ペレットを分割して案内する複数の衝立が設け
られており、これらの衝立によって仕切られる通路の間
口が回転炉床の外周部へ投入することとなるペレットを
案内する通路の間口から回転炉床の内周部へ投入するこ
ととなるペレットを案内する通路の間口へと順次狭くな
るよう形成されて成ることを特徴とするペレット投入機
構に係る。SUMMARY OF THE INVENTION The present invention, which solves the above-mentioned problems, comprises a mechanism for feeding pellets to a rotary hearth furnace for heating and reducing metal oxides in the pellets charged on the rotary hearth, wherein A plurality of screens for dividing and guiding the pellets are provided in a trough of a vibrating conveyor to be thrown onto a rotary hearth, and a frontage of a passage partitioned by these screens is thrown into an outer peripheral portion of the rotary hearth. The present invention relates to a pellet charging mechanism, which is formed so as to be gradually narrowed from a frontage of a passage for guiding pellets to a frontage of a passage for guiding pellets to be charged into the inner peripheral portion of the rotary hearth.
【０００６】本発明に係るペレット投入機構が適用され
る回転床炉は、前述したように、炉内に皿状の回転炉床
及びこの回転炉床に近接して抽出機構、例えば水冷スク
リューが装備されており、炉壁に複数のバーナが取り付
けられていて、炉頂に装備された投入機構によりペレッ
トを炉内の回転炉床上へ連続投入し、投入したペレット
が回転炉床の回転により抽出機構へと到るまでの間に、
該ペレット中の金属酸化物をバーナの火炎で加熱し、同
伴する還元材で還元して、生成した金属を抽出機構で連
続抽出するようになっているものである。As described above, a rotary hearth furnace to which the pellet charging mechanism according to the present invention is applied is equipped with a dish-shaped rotary hearth and an extraction mechanism, for example, a water-cooled screw in the vicinity of the rotary hearth. A plurality of burners are attached to the furnace wall, and pellets are continuously charged onto the rotary hearth in the furnace by a charging mechanism mounted on the furnace top, and the input pellets are extracted by the rotation of the rotary hearth. Before reaching
The metal oxide in the pellets is heated by a flame of a burner, reduced by an accompanying reducing agent, and the generated metal is continuously extracted by an extraction mechanism.
【０００７】本発明に係るペレット投入機構は振動コン
ベヤを主体とするものであるが、振動コンベヤのトラフ
にペレットを分割して案内する複数の衝立が設けられて
おり、トラフにはこれらの衝立によってペレットを案内
する複数の通路が形成されている。これらの通路の出口
は、トラフに設けたスリットから直下の回転炉床上へペ
レットを投入する場合にはかかるスリットに到り、また
トラフの先端部から直下の回転炉床上へペレットを投入
する場合にはかかる先端部に到っている。そしてこれら
の通路の間口すなわち入口幅は、回転炉床の外周部へ投
入することとなるペレットを案内する通路の間口が最も
広く形成されており、また回転炉床の内周部へ投入する
こととなるペレットを案内する通路の間口が最も狭く形
成されていて、双方の中間に位置する各通路の間口は上
記の最も広く形成された間口側から最も狭く形成された
間口側へと順次狭くなるよう形成されている。The pellet feeding mechanism according to the present invention is mainly composed of a vibrating conveyor, but a plurality of screens for dividing and guiding the pellets are provided on a trough of the vibrating conveyor, and the trough is provided with these screens. A plurality of passages for guiding the pellets are formed. The exits of these passages reach the slit when the pellets are put on the rotary hearth directly below from the slit provided in the trough, and when the pellets are put on the rotary hearth directly below from the tip of the trough. Has reached such a tip. The width of the passage, that is, the width of the entrance, is such that the width of the passage that guides the pellets to be introduced into the outer peripheral portion of the rotary hearth is formed most widely, and the width of the entrance is the inner peripheral portion of the rotary hearth. The frontage of the passage for guiding the pellets to be formed is formed to be the narrowest, and the frontage of each passage located in the middle between the two gradually narrows from the widest frontage side to the narrowest frontage side. It is formed as follows.
【０００８】本発明に係るペレット投入機構では、間口
が最も広く形成された通路へと案内されるペレットの量
は相応に多く、間口が最も狭く形成された通路へと案内
されるペレットの量は相応に少なく、双方の間で間口が
順次狭くなるよう形成された各通路へと案内されるペレ
ットの量は順次少なくなる。そして間口の最も広い通路
へと案内されたペレットは回転炉床のうちで周速度が最
も速い外周部へ投入され、また間口の最も狭い通路へと
案内されたペレットは回転炉床のうちで周速度が最も遅
い内周部へ投入され、双方の間で間口の順次狭い各通路
へと案内された各ペレットは回転炉床のうちで周速度が
順次遅い中間相当部へ投入される。結果として、回転炉
床上へ投入したペレットの厚みを、回転炉床の外周部と
内周部とでほぼ同じにすることができ、全体的に均一化
できる。In the pellet charging mechanism according to the present invention, the amount of pellets guided to the passage having the widest opening is correspondingly large, and the amount of pellets guided to the passage having the narrowest opening is small. The amount of pellets guided to each passage, which is correspondingly small and the width of the front and back narrows progressively between the two, progressively decreases. Then, the pellets guided to the widest passage in the frontage are thrown into the outer peripheral portion of the rotary hearth where the peripheral speed is the fastest, and the pellets guided to the narrowest passage in the frontage are rotated in the rotary hearth. The pellets introduced into the inner peripheral portion having the slowest speed and guided into the narrow passages each having a narrower frontage between the two are introduced into the intermediate equivalent portion of the rotary hearth having the slowest peripheral speed. As a result, the thickness of the pellets put on the rotary hearth can be made substantially the same at the outer peripheral portion and the inner peripheral portion of the rotary hearth, and the whole can be made uniform.
【０００９】[0009]
【発明の実施の形態】図１は本発明に係るペレット投入
機構を回転床炉との関係で略示する一部省略の平面図、
図２は図１と同じペレット投入機構を示す部分拡大平面
図、図３は図１と同じペレット投入機構を示す部分拡大
縦断面図である。図示した回転床炉は、炉本体１１とこ
れに被着された図示しない炉蓋とを備え、全体として円
形に構築されている。炉内にはリング形皿状の回転炉床
１２及びこの回転炉床１２に近接して水冷スクリュー１
３が装備されており、炉本体１１の筒形に構築された外
壁及び内壁に複数のバーナ１４が取り付けられている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partially omitted plan view schematically showing a pellet charging mechanism according to the present invention in relation to a rotary bed furnace.
FIG. 2 is a partially enlarged plan view showing the same pellet loading mechanism as in FIG. 1, and FIG. 3 is a partially enlarged longitudinal sectional view showing the same pellet loading mechanism as in FIG. The illustrated rotary bed furnace includes a furnace main body 11 and a furnace lid (not shown) attached to the furnace main body 11, and is constructed in a circular shape as a whole. In the furnace, a ring-shaped dish-shaped rotary hearth 12 and a water-cooled screw 1
3 are provided, and a plurality of burners 14 are attached to an outer wall and an inner wall of the furnace body 11 which are constructed in a cylindrical shape.
【００１０】炉蓋には回転炉床１２の幅に亘る図示しな
い投入口が設けられており、この投入口の上部に全体は
図示しない振動コンベヤのトラフ２１が配置されてい
る。トラフ２１には回転炉床１２の幅に亘るスリット３
１が設けられており、このスリット３１は投入口を直下
に臨んでいる。ペレットは振動コンベヤのトラフ２１か
ら、スリット３１及び投入口を介して、回転炉床１２上
へ投入されるようになっている。The furnace lid is provided with an inlet (not shown) extending over the width of the rotary hearth 12, and a trough 21 of a vibrating conveyor (not shown) is disposed above the inlet. The trough 21 has a slit 3 extending over the width of the rotary hearth 12.
1 is provided, and the slit 31 faces the inlet directly below. The pellets are charged from the trough 21 of the vibrating conveyor onto the rotary hearth 12 through the slit 31 and the charging port.
【００１１】トラフ２１にはペレットを分割して案内す
る合計４本の衝立４１〜４４が設けられており、トラフ
２１にはこれらの衝立４１〜４４及びトラフ２１の両側
壁によって合計５本の通路５１〜５５が形成されてい
る。衝立４１〜４４はスリット３１まで延設されてお
り、したがって通路５１〜５５の出口はスリット３１に
到っている。そして、回転炉床１２の外周部へ投入する
こととなるペレットを案内する通路５１の間口６１は最
も広く形成されており、また回転炉床１２の内周部へ投
入することとなるペレットを案内する通路５５の間口６
５は最も狭く形成されていて、双方の中間に位置する各
通路５２〜５４の間口６２〜６４は間口６２側から間口
６４側へと順次狭くなるよう形成されている。The trough 21 is provided with a total of four partitions 41 to 44 for dividing and guiding the pellets. The trough 21 has a total of five passages formed by these partitions 41 to 44 and both side walls of the trough 21. 51 to 55 are formed. The partitions 41 to 44 extend to the slit 31, so that the exits of the passages 51 to 55 reach the slit 31. The frontage 61 of the passage 51 for guiding the pellets to be thrown into the outer peripheral portion of the rotary hearth 12 is formed most widely, and guides the pellets to be thrown into the inner peripheral portion of the rotary hearth 12. Frontage 6 of the passage 55
5 is formed to be the narrowest, and the frontage 62 to 64 of each of the passages 52 to 54 located in the middle between them is formed so as to gradually narrow from the frontage 62 side to the frontage 64 side.
【００１２】図１〜３に示したペレット投入機構では、
最も広く形成された間口６１の通路５１へと案内される
ペレットの量は相応に多く、最も狭く形成された間口６
５の通路５５へと案内されるペレットの量は相応に少な
く、双方の間で順次狭くなるよう形成された間口６２〜
６４の各通路５２〜５４へと案内されるペレットの量は
順次少なくなる。そして通路５１へと案内されたペレッ
トは回転炉床１２のうちで周速度が最も速い外周部へ投
入され、また通路５５へと案内されたペレットは回転炉
床１２のうちで周速度が最も遅い内周部へ投入され、通
路５１と通路５５との間の各通路５２〜５４へと案内さ
れた各ペレットは回転炉床１２のうちで周速度が順次遅
い中間相当部へ投入される。結果として、回転炉床１２
上へ投入したペレットの厚みを、回転炉床の外周部と内
周部とでほぼ同じにすることができ、全体的に均一化で
きる。In the pellet feeding mechanism shown in FIGS.
The amount of pellets guided into the passage 51 of the widest frontage 61 is correspondingly large and the narrowest frontage 6
The amount of the pellets guided to the passage 55 of No. 5 is correspondingly small, and the frontage 62 to the frontage 62 are formed so as to gradually narrow between the two.
The amount of pellets guided to each of the 64 passages 52-54 is progressively smaller. Then, the pellets guided to the passage 51 are introduced into the outer peripheral portion of the rotary hearth 12 having the highest peripheral speed, and the pellets guided to the passage 55 have the slowest peripheral speed of the rotary hearth 12. Each pellet introduced into the inner peripheral portion and guided to each of the passages 52 to 54 between the passage 51 and the passage 55 is introduced into an intermediate equivalent portion of the rotary hearth 12 having a gradually lower peripheral speed. As a result, the rotary hearth 12
The thickness of the pellets put into the upper part can be made substantially the same at the outer peripheral part and the inner peripheral part of the rotary hearth, and the whole can be made uniform.
【００１３】図４は本発明に係る他のペレット投入機構
を示す部分拡大平面図である。全体は図示しない振動コ
ンベヤのトラフ２２における衝立４５〜４８、通路５６
〜６０及び間口６６〜７０の相互関係は図２の場合と同
様になっているが、このペレット投入機構では、トラフ
２２の先端部が回転炉床の幅に亘るように形成されてお
り、この先端部が図２のスリット３１の役目を果たし、
したがってペレットをこの先端部から投入するようにな
っている。FIG. 4 is a partially enlarged plan view showing another pellet feeding mechanism according to the present invention. Partitions 45 to 48, passages 56 in the trough 22 of the vibration conveyor (not shown)
2 to 60 and the frontage 66 to 70 are the same as in FIG. 2, but in this pellet charging mechanism, the tip of the trough 22 is formed so as to span the width of the rotary hearth. The tip serves as the slit 31 in FIG.
Therefore, the pellets are introduced from this tip.
【００１４】[0014]
【発明の効果】既に明らかなように、以上説明した本発
明には、回転炉床上へその外周部から内周部に亘り均一
にペレットを投入できるという効果がある。As is apparent from the above description, the present invention described above has an effect that the pellets can be uniformly poured onto the rotary hearth from the outer peripheral portion to the inner peripheral portion.
【図１】本発明に係るペレット投入機構を回転床炉との
関係で略示する一部省略の平面図。FIG. 1 is a partially omitted plan view schematically showing a pellet charging mechanism according to the present invention in relation to a rotary hearth furnace.
【図２】図１と同じペレット投入機構を示す部分拡大平
面図。FIG. 2 is a partially enlarged plan view showing the same pellet loading mechanism as in FIG.
【図３】図１と同じペレット投入機構を示す部分拡大縦
断面図。FIG. 3 is a partially enlarged longitudinal sectional view showing the same pellet feeding mechanism as that of FIG.
【図４】本発明に係る他のペレット投入機構を示す部分
拡大平面図。FIG. 4 is a partially enlarged plan view showing another pellet feeding mechanism according to the present invention.
１１・・・炉本体、１２・・・回転炉床、１３・・・水
冷スクリュー、１４・・・バーナ、２１，２２・・・ト
ラフ、３１・・・スリット、４１〜４８・・・衝立、５
１〜６０・・・通路、６１〜７０・・・間口11: furnace body, 12: rotary hearth, 13: water cooling screw, 14: burner, 21, 22, trough, 31: slit, 41 to 48: partition, 5
1 to 60: passage, 61 to 70: frontage
Claims (1)
酸化物を加熱、還元する回転床炉へのペレット投入機構
であって、ペレットを回転炉床上へ投入する振動コンベ
ヤのトラフに該ペレットを分割して案内する複数の衝立
が設けられており、これらの衝立によって仕切られる通
路の間口が回転炉床の外周部へ投入することとなるペレ
ットを案内する通路の間口から回転炉床の内周部へ投入
することとなるペレットを案内する通路の間口へと順次
狭くなるよう形成されて成ることを特徴とするペレット
投入機構。A pellet feeding mechanism for heating and reducing a metal oxide in a pellet charged on a rotary hearth into a rotary hearth furnace, wherein the pellet is placed in a trough of a vibrating conveyor for charging the pellet onto the rotary hearth. A plurality of partitions are provided for guiding the partition, and the frontage of the passage partitioned by these partitions is provided from the frontage of the passage for guiding the pellets to be introduced into the outer peripheral portion of the rotary hearth from the inner periphery of the rotary hearth. A pellet feeding mechanism, which is formed so as to be gradually narrowed to a frontage of a passage for guiding pellets to be fed into a section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11595598A JP3978756B2 (en) | 1998-04-10 | 1998-04-10 | Pellet charging mechanism in rotary bed furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11595598A JP3978756B2 (en) | 1998-04-10 | 1998-04-10 | Pellet charging mechanism in rotary bed furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11293317A true JPH11293317A (en) | 1999-10-26 |
| JP3978756B2 JP3978756B2 (en) | 2007-09-19 |
Family
ID=14675287
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11595598A Expired - Fee Related JP3978756B2 (en) | 1998-04-10 | 1998-04-10 | Pellet charging mechanism in rotary bed furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3978756B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102784731A (en) * | 2012-08-08 | 2012-11-21 | 安徽六国化工股份有限公司 | Atomizing nozzle for spraying granulation |
| CN110274464A (en) * | 2019-07-11 | 2019-09-24 | 重庆赛迪热工环保工程技术有限公司 | A kind of annular material receiving device and its distributing method |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102080929B (en) * | 2009-11-27 | 2012-12-19 | 中冶长天国际工程有限责任公司 | Distributing device for rotary hearth furnace |
| JP5483589B2 (en) | 2010-09-01 | 2014-05-07 | 株式会社神戸製鋼所 | Reduced iron material supply system |
-
1998
- 1998-04-10 JP JP11595598A patent/JP3978756B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102784731A (en) * | 2012-08-08 | 2012-11-21 | 安徽六国化工股份有限公司 | Atomizing nozzle for spraying granulation |
| CN110274464A (en) * | 2019-07-11 | 2019-09-24 | 重庆赛迪热工环保工程技术有限公司 | A kind of annular material receiving device and its distributing method |
| CN110274464B (en) * | 2019-07-11 | 2024-02-23 | 重庆赛迪热工环保工程技术有限公司 | Annular material receiving device and material distribution method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3978756B2 (en) | 2007-09-19 |
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