JPH0637654B2 - Preliminary reduction method in circulating fluidized bed of powdered ore - Google Patents
Preliminary reduction method in circulating fluidized bed of powdered oreInfo
- Publication number
- JPH0637654B2 JPH0637654B2 JP27386589A JP27386589A JPH0637654B2 JP H0637654 B2 JPH0637654 B2 JP H0637654B2 JP 27386589 A JP27386589 A JP 27386589A JP 27386589 A JP27386589 A JP 27386589A JP H0637654 B2 JPH0637654 B2 JP H0637654B2
- Authority
- JP
- Japan
- Prior art keywords
- ore
- fluidized bed
- riser
- cyclone
- circulating fluidized
- 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.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims description 8
- 239000000843 powder Substances 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000005336 cracking Methods 0.000 claims description 6
- 239000008187 granular material Substances 0.000 claims description 5
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000011362 coarse particle Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 description 1
- 239000012256 powdered iron Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Manufacture Of Iron (AREA)
Description
【発明の詳細な説明】 ＜産業上の利用分野＞ 本発明は、循環流動層における粉状鉱石の予備還元方法
に関するものである。TECHNICAL FIELD The present invention relates to a method for preliminarily reducing powdery ore in a circulating fluidized bed.
＜従来の技術＞ 従来、循環流動層による粉状鉱石の予備還元において、
原料となる粉状鉱石の装入位置は、循環流動層を構成す
るライザー，サイクロン（正確にはサイクロン入口）及
びダウンカマーのいずれか一箇所であった。日本鉄鋼協
会講演論文集（vol2,NO.1，1989(89)）には、循環流動
層のサイクロン下降管（通称、ダウンカマー）のみに粉
状鉱石を装入しており、装入位置の使い分けは明示され
ていない。<Prior Art> Conventionally, in the preliminary reduction of powdery ore by a circulating fluidized bed,
The raw material powdered ore was charged at any one of the riser, the cyclone (accurately speaking, the cyclone inlet) and the downcomer forming the circulating fluidized bed. The Iron and Steel Institute's lecture paper (vol2, NO.1, 1989 (89)) contains powdered ore only in the cyclone downcomer (commonly known as downcomer) of the circulating fluidized bed. The usage is not specified.
また、特開昭62-228888号公報には、粉状鉱石の装入位
置として煙道の途中が明示されている。Further, in Japanese Patent Laid-Open No. 62-228888, the midpoint of the flue is specified as the charging position of the powdery ore.
以上のように、従来技術では粉状鉱石の装入位置を１箇
所に特定していて、装入位置の選択（使い分け）がなか
った。As described above, in the conventional technique, the charging position of the powdery ore is specified at one position, and there is no selection (selection) of the charging position.
＜発明が解決しようとする課題＞ 循環流動層で粉状鉱石を予備還元する際、設備（粉状鉱
石の処理量）が大きくなるほど、多様な特性をもった粉
状鉱石が使用でき、なおかつ、操業の安定が重要にな
る。<Problems to be Solved by the Invention> When preliminarily reducing powdery ore in a circulating fluidized bed, the larger the equipment (processing amount of powdery ore), the more powdery ore with various characteristics can be used, and Stability of operations is important.
従来技術では、粉状鉱石の特性（粒径分布，熱割れ性，
含有水分量）に応じて、粉状鉱石の装入位置を選択して
いないため、粉状鉱石の歩留りの低下、粉状鉱石の微粉
化による循環異常、予備還元率の低下などの問題があっ
た。In the prior art, the characteristics of powdered ore (particle size distribution, heat cracking,
Since the charging position of the powdery ore is not selected according to the water content), there are problems such as a decrease in the yield of the powdery ore, abnormal circulation due to atomization of the powdery ore, and a reduction in the preliminary reduction rate. It was
本発明は、前記問題点を解決する循環流動層による粉状
鉱石の予備還元技術を提供するためになされたものであ
る。The present invention has been made to provide a technique for preliminarily reducing powdery ore by a circulating fluidized bed that solves the above problems.
＜課題を解決するための手段＞ 本発明は、還元ガスによって粉粒体を流動状態にするラ
イザーと、流動層から排出する粉粒体を捕集するサイク
ロンと、捕集器の下方に連設する粉粒体が充填されるダ
ウンカマーと、ダウンカマーの下方より粉粒体をライザ
ーに戻す循環装置とからなる循環流動層を用いて粉状鉱
石を予備還元する方法において、粒径分布，熱割れ性，
含有水分量等の粉状鉱石の特性に応じてライザー，サイ
クロン，ダウンカマーのいずれか一箇所または複数箇所
を選択して粉状鉱石を装入することを特徴とする粉状鉱
石の循環流動層における予備還元方法である。<Means for Solving the Problems> The present invention relates to a riser for bringing powders and granules into a fluidized state by a reducing gas, a cyclone for collecting powders and granules discharged from a fluidized bed, and a continuous installation below a collector. In the method of pre-reducing powdery ore using a circulating fluidized bed consisting of a downcomer filled with powder particles and a circulation device for returning the powder particles to the riser from below the downcomer, Crackability,
Circulating fluidized bed of powdery ore characterized by charging powdery ore at one or more locations of riser, cyclone, and downcomer according to the characteristics of powdery ore such as water content The preliminary reduction method in.
＜作用＞ 循環流動層は、第１図に示すようにライザー１内に滞留
する粉状鉱石２を、その粉状鉱石の終端速度以上の循環
ガス流速で流動化させ、粉状鉱石をライザーから飛出さ
せる。ライザーから飛び出した粉状鉱石は、サイクロン
３で捕集されダウンカマー４を経て循環装置５によりラ
イザー１に戻される。粉状鉱石を流動化し、予備還元す
るため高温の還元ガス６は、ライザー下部から導入され
る。従って、循環流動層では、ライザー下部が一番温度
が高い。<Operation> As shown in FIG. 1, the circulating fluidized bed fluidizes the powdery ore 2 retained in the riser 1 at a circulating gas flow velocity higher than the terminal velocity of the powdery ore, and the powdery ore is removed from the riser. Let it pop out. The powdery ore that has flown out of the riser is collected by the cyclone 3, passed through the downcomer 4, and returned to the riser 1 by the circulation device 5. A high-temperature reducing gas 6 for fluidizing and preliminarily reducing the powdery ore is introduced from the lower part of the riser. Therefore, in the circulating fluidized bed, the lower part of the riser has the highest temperature.
このようなライザーに熱割れ性の鉱石を装入すると急速
昇温により鉱石が割れて微粉化し、サイクロンでの捕集
効率が低下したり、予備還元鉱石を使用する次工程（例
えば冶金炉）に輸送する場合、配管内に微粉鉱石が詰ま
ったりするなどのトラブルが生ずる。従って、熱割れ性
の粉状鉱石の場合は、サイクロン（正確にはサイクロン
入口）および／またはダウンカマーに装入する方が割れ
にくい。When a heat-cracking ore is charged into such a riser, the ore cracks and becomes fine powder due to rapid temperature rise, and the collection efficiency in the cyclone decreases, and the next step (for example, a metallurgical furnace) that uses pre-reduced ore When transported, troubles such as clogging of the fine ore in the pipe will occur. Therefore, in the case of a heat-crackable powdery ore, it is more difficult to be charged into a cyclone (more precisely, a cyclone inlet) and / or downcomer.
また、水分含有量の多い粉状鉱石の場合には、水分が水
蒸気になって粉状鉱石の還元を阻害するため、反応が行
われるライザーよりもサイクロンに装入する方が予備還
元率が上る。Also, in the case of powdery ore with a high water content, since the water content becomes steam and inhibits the reduction of the powdery ore, the preliminary reduction rate is higher in the cyclone charging than in the riser in which the reaction is performed. .
粉状鉱石の粒径分布が細い場合には、サイクロンに装入
するとサイクロンで捕集されないで、系外７に排出され
る粉状鉱石が多くなるため、粉状鉱石の回収歩留りが低
下する。従って粒径分布が細い場合には、ライザーおよ
び／またはダウンカマーに装入する方が鉱石歩留りが上
昇する。When the particle size distribution of the powdery ore is narrow, when it is charged into the cyclone, it is not collected by the cyclone, and the powdery ore discharged to the outside of the system 7 increases, so that the recovery yield of the powdery ore decreases. Therefore, when the particle size distribution is narrow, the ore yield is increased by charging the riser and / or the downcomer.
粉状鉱石の粒径分布が粗い場合には、どこに装入するこ
とも可能だが、装入位置によって操業の効果が変わって
くる。If the particle size distribution of the powdered ore is rough, it can be charged anywhere, but the effect of operation changes depending on the charging position.
つまり、ライザーの圧力変動が不安定な時、ダウンカマ
ーに装入すれば還元ガスの逆流（還元ガスが循環装置→
ダウンカマー→サイクロンの経由で流れるトラブル）を
予防できる。一般に、ライザーに装入すればライザー内
の粉状鉱石の滞留量が何時も確保できるので還元率が安
定化する。さらに、サイクロンに装入すれば、サイクロ
ン捕集効率を悪化させるサイクロン内壁に付着したダス
トは、粗粒が当たることによってクリーニングされて、
サイクロンの捕集効率を良好にできる。In other words, when the riser pressure fluctuation is unstable, if the downcomer is charged, the reducing gas flows backward (the reducing gas is circulated →
Downcomer-> troubles that flow via a cyclone) can be prevented. Generally, if charged into the riser, the amount of powdery ore retained in the riser can be secured at any time, so the reduction rate is stabilized. Furthermore, if charged into a cyclone, dust adhering to the cyclone inner wall, which deteriorates cyclone collection efficiency, is cleaned by hitting coarse particles,
The collection efficiency of cyclones can be improved.
以上のように、粒径分布，熱割れ性，含有水分などの粉
状鉱石の特性に応じて装入位置を選択することによって
循環流動層の操業成績が向上し、従来技術の問題点を解
決できることがわかった。As described above, the operating results of the circulating fluidized bed are improved by selecting the charging position according to the characteristics of the powdery ore such as particle size distribution, heat cracking property, and water content, and the problems of the conventional technology are solved. I knew I could do it.
なお、特性の異なる２種以上の粉状鉱石を同時に使用す
る場合には、上記した方法で夫々に適した装入位置を選
択すると好成績になるのはもちろんである。When two or more kinds of powdery ores having different characteristics are used at the same time, it goes without saying that good results can be obtained by selecting the charging position suitable for each by the above method.
＜実施例＞ 内径0.7ｍφ，内部高さ7.3ｍのライザーで粉状鉄鉱石処
理量600kg／Ｈ、還元ガス流量（CO：45％、H2：18％，N
2：残り）3100Ｎm3／Ｈ，還元温度750℃，還元時間１時
間を基準操業条件とした。<Example> With a riser having an inner diameter of 0.7 mφ and an inner height of 7.3 m, a powdered iron ore processing amount is 600 kg / H, a reducing gas flow rate (CO: 45%, H 2 : 18%, N
2 : Remaining) 3100 Nm 3 / H, reduction temperature 750 ° C, reduction time 1 hour were used as standard operating conditions.
本発明に基づく実施例および較例を第１表に示す。Table 1 shows examples and comparative examples according to the present invention.
熱割れ性の鉱石はダウンカマーに装入することによっ
て、操業が安定する（実施例１）。By loading the heat cracking ore into the downcomer, the operation is stabilized (Example 1).
水分含有鉱石はサイクロンに装入することによって、予
備還元率が上昇する（実施例２）。By charging the water-containing ore into the cyclone, the preliminary reduction rate increases (Example 2).
サイクロン内壁にダストが付着している場合は、粗粒を
サイクロンに装入することによって、サイクロン歩留り
が復帰・向上する（実施例３）と同時にライザーに装入
することによって予備還元率は向上する（実施例３）。When dust adheres to the inner wall of the cyclone, by loading coarse particles into the cyclone, the cyclone yield is restored / improved (Example 3), and at the same time, by loading into the riser, the preliminary reduction rate is improved. (Example 3).
微粉鉱石はダウンカマーに装入することによって鉱石歩
留りが向上する（実施例４）。ライザーの圧力変動が大
きい時は、ダウンカマーに装入することにより、ライザ
ーの圧力変動が低下し操業が安定化する（実施例５）。By charging the fine ore into the downcomer, the ore yield is improved (Example 4). When the pressure fluctuation of the riser is large, by charging the downcomer, the pressure fluctuation of the riser is reduced and the operation is stabilized (Example 5).
＜発明の効果＞ 循環流動層で粉状鉱石を予備還元する際、粉状鉱石の装
入位置を粉状鉱石の特性に応じて選択装入するようにし
たことによって、熱割れ性鉱石や水分含有鉱石の使用が
可能になり、サイクロンの捕集効果が上って歩留りが上
昇し、さらに循環の維持や圧力変動の低下によって操業
を安定してできるようになった。 <Effects of the Invention> When the powdery ore is preliminarily reduced in the circulating fluidized bed, the charging position of the powdery ore is selectively charged according to the characteristics of the powdery ore, so that the heat-cracking ore and the water content can be reduced. It became possible to use the contained ore, the collection effect of the cyclone increased, the yield increased, and the operation became stable by maintaining the circulation and decreasing the pressure fluctuation.
第１図は循環流動層を用いた粉状鉱石の予備還元装置の
説明図である。 １……ライザー、２……粉状鉱石、 ３……サイクロン、４……ダウンカマーン ５……循環装置、６……還元ガス、 ７……系外。FIG. 1 is an explanatory diagram of a powdery ore pre-reducing apparatus using a circulating fluidized bed. 1 ... Riser, 2 ... Powder ore, 3 ... Cyclone, 4 ... Down Kaman 5 ... Circulation device, 6 ... Reducing gas, 7 ... Outside the system.
Claims (1)
ライザーと、流動層から排出する粉粒体を捕集するサイ
クロンと、捕集器の下方に連設する粉粒体が充填される
ダウンカマーと、ダウンカマーより粉粒体をライザーに
戻す循環装置とからなる循環流動層を用いて粉状鉱石を
予備還元する方法において、 粒径分布，熱割れ性，含有水分量等の粉状鉱石の特性に
応じてライザー，サイクロン，ダウンカマーのいずれか
一箇所または複数箇所を選択して粉状鉱石を装入するこ
とを特徴とする粉状鉱石の循環流動層における予備還元
方法。1. A riser for bringing powders and granules into a fluidized state by a reducing gas, a cyclone for collecting powders and granules discharged from a fluidized bed, and a powder and granules connected under a collector are filled. In a method of pre-reducing powdery ore using a circulating fluidized bed consisting of a downcomer and a circulation device that returns powder from the downcomer to the riser, powdery particles such as particle size distribution, heat cracking property, and water content A preliminary reduction method in a circulating fluidized bed of powdered ore, which comprises charging one or more of a riser, a cyclone, and a downcomer according to the characteristics of the ore and charging the powdered ore.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27386589A JPH0637654B2 (en) | 1989-10-23 | 1989-10-23 | Preliminary reduction method in circulating fluidized bed of powdered ore |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27386589A JPH0637654B2 (en) | 1989-10-23 | 1989-10-23 | Preliminary reduction method in circulating fluidized bed of powdered ore |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03138308A JPH03138308A (en) | 1991-06-12 |
| JPH0637654B2 true JPH0637654B2 (en) | 1994-05-18 |
Family
ID=17533636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27386589A Expired - Lifetime JPH0637654B2 (en) | 1989-10-23 | 1989-10-23 | Preliminary reduction method in circulating fluidized bed of powdered ore |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0637654B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0788523B2 (en) * | 1991-03-29 | 1995-09-27 | 新日本製鐵株式会社 | Operating method of circulating fluidized bed reduction equipment |
-
1989
- 1989-10-23 JP JP27386589A patent/JPH0637654B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03138308A (en) | 1991-06-12 |
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