JP2968603B2 - Reduced ore discharge device of fluidized bed reduction furnace - Google Patents
Reduced ore discharge device of fluidized bed reduction furnaceInfo
- Publication number
- JP2968603B2 JP2968603B2 JP6666991A JP6666991A JP2968603B2 JP 2968603 B2 JP2968603 B2 JP 2968603B2 JP 6666991 A JP6666991 A JP 6666991A JP 6666991 A JP6666991 A JP 6666991A JP 2968603 B2 JP2968603 B2 JP 2968603B2
- Authority
- JP
- Japan
- Prior art keywords
- fluidized bed
- ore
- pressure
- gas
- reduction 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.)
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- Manufacture Of Iron (AREA)
- Crucibles And Fluidized-Bed Furnaces (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、流動層還元炉を用いて
鉄鉱石を還元する設備に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facility for reducing iron ore using a fluidized bed reduction furnace.
【０００２】[0002]
【従来の技術】従来の高炉による溶銑製造技術に替わる
ものとして、溶融還元法が注目を浴びている。この方法
は、粉鉱石の使用、一般炭の使用、コークス工程の省略
等により溶銑を安価に製造することを目的に開発されて
いる。また、溶融還元炉で発生した排ガスの還元力およ
び熱を有効に利用するために、流動ガスとして流動層還
元炉に供給して原料鉱石を予熱、予備還元する方法等も
開発されている。2. Description of the Related Art A smelting reduction method has attracted attention as an alternative to the conventional hot metal production technology using a blast furnace. This method has been developed for the purpose of producing hot metal at low cost by using fine ore, using steam coal, omitting the coke process, and the like. In addition, in order to effectively use the reducing power and heat of the exhaust gas generated in the smelting reduction furnace, a method of preheating and preliminarily reducing the raw material ore by supplying it to a fluidized bed reduction furnace as a fluidized gas has been developed.
【０００３】かかる流動層装置として、特開平１−１１
１８０７号公報に開示された型式のものがあり、この型
式のものは、側部に粉鉱石投入部と底部付近に流動層形
成用のキャリアガス導入部とさらに流動層の底板の全面
にノズルを設けた流動用ガス導入部とを設けた流動層
（ライザー）と、その外側にサイクロンを介して粉体を
循環するための粉体循環流動部（ダウンカマー）とから
なる循環型の流動層を有するものと、サイクロンで捕集
した粉状の鉄鉱石（還元鉱石）をライザーへ戻さない非
循環型の流動層とがある。[0003] As such a fluidized bed apparatus, Japanese Patent Application Laid-Open No. 1-11 / 1999
There is a type disclosed in Japanese Patent No. 1807 , which has a fine ore charging part on the side, a carrier gas introduction part for forming a fluidized bed near the bottom, and a nozzle on the entire surface of the bottom plate of the fluidized bed. A circulating fluidized bed comprising a fluidized bed (riser) provided with a provided gas introduction section for fluidization and a powder circulating fluidized section (downcomer) for circulating powder through a cyclone outside the fluidized bed. And a non-circulating fluidized bed that does not return the powdered iron ore (reduced ore) collected by the cyclone to the riser.
【０００４】何れの型式の場合も還元鉱石の排出装置
は、流動層内のガス圧力が高く、且つＣＯ等を含む有害
ガスの排出部においてガスがリークしないようなシール
性の高いロータリーフィーダ、スクリューフィーダ等の
機械的なものや気体搬送型のニューマチックフィーダが
使用されている。[0004] In any of the types, the reduced ore discharging device is provided with a rotary feeder or a screw having a high sealing property such that the gas pressure in the fluidized bed is high and the gas does not leak at the discharging portion of the harmful gas containing CO or the like. A mechanical one such as a feeder or a pneumatic feeder of a gas transfer type is used.
【０００５】[0005]
【発明が解決しようとする課題】ところが、この従来の
流動層還元炉の還元鉱石排出装置の中で、ロータリーフ
ィーダ、スクリューフィーダ等の機械的手段による排出
装置は、流動層還元炉の内部温度は９００〜１０００℃
の高温であり、しかもＨ2 Ｏ，ＳＯ2 等の腐食性ガスが
リッチな還元ガス雰囲気中での粉鉱石の切出しであるた
めに、構成材料の高温腐食、応力腐食による劣化と機械
的摩耗による回転部分のトラブルが多く発生するという
問題がある。また、還元ガスはＣＯ，Ｈ2 の有害ガスが
数十％含まれており、系外へ洩れると爆発や中毒で人
的，物的な重大災害を招く危険性が大である。このた
め、回転羽根刃先とケーシングとの隙間を小さくしてガ
スリークを防止する構造がとられる。しかし、高温の粉
鉱石を切出すと、刃先のシール部がすぐに摩耗してガス
リークが発生したり、刃先の隙間が小さいため粉粒子が
噛込んで回転がストップする。このため、非常に操業性
が悪く、且つメンテナンスに多大の費用がかかってい
た。However, among the reduced ore discharge devices of this conventional fluidized bed reduction furnace, a discharge device using a mechanical means such as a rotary feeder and a screw feeder has an internal temperature of the fluidized bed reduction furnace. 900-1000 ° C
At high temperatures, and because of the cutting of fine ore in a reducing gas atmosphere rich in corrosive gases such as H 2 O and SO 2 , the constituent materials are deteriorated by high temperature corrosion, stress corrosion and mechanical wear. There is a problem that many troubles occur in the rotating part. Moreover, the reducing gas contains tens of percent of harmful gases such as CO and H 2 , and if leaked out of the system, there is a great risk of causing explosion or poisoning and causing serious human and physical disasters. For this reason, a structure is adopted in which the gap between the rotary blade tip and the casing is reduced to prevent gas leakage. However, when high-temperature fine ore is cut out, the seal portion of the cutting edge is quickly worn to cause gas leak, and the rotation of the cutting edge is stopped because the cutting edge has a small gap and powder particles are caught. For this reason, the operability was very poor and the maintenance cost was high.
【０００６】これに対して、ニューマチックフィーダの
ようなキャリアガスを利用したガス搬送式排出装置の場
合には、切出しのための回転部材が存在しないので、上
記のような問題はなく優れていると言える。On the other hand, in the case of a gas transfer type discharge device using a carrier gas, such as a pneumatic feeder, there is no rotating member for cutting out, so that the above-mentioned problem is eliminated and excellent. It can be said.
【０００７】しかしながら、このニューマチックフィー
ダの場合には、流動層内の圧力と外気圧との圧力差が大
の場合、流動層内の圧力変動をもろに受けることにな
り、流動層内の圧力が上昇したときにはニューマチック
フィーダーの粉体シール部の鉄鉱石を一気に外気側へ排
出するため、排出口から層内のガスが突出し、切出制御
が不可能となる。一旦、ニューマチックフィーダーの粉
体シール部が壊れると、その部分を粒子がガスによって
気流搬送されるため、粒子が溜まり、容易に粉体シール
機構が回復しないため、安定操業ができなくなくという
欠点がある。However, in the case of this pneumatic feeder, when the pressure difference between the pressure in the fluidized bed and the outside air pressure is large, the pressure in the fluidized bed is subject to fluctuations, and the pressure in the fluidized bed is increased. When the iron ore rises, the iron ore in the powder seal portion of the pneumatic feeder is discharged to the outside air at a stretch, so that the gas in the layer protrudes from the discharge port and cutting control becomes impossible. Once the powder seal part of the pneumatic feeder breaks, the particles are transported by gas in the air flow, so that the particles accumulate and the powder seal mechanism does not recover easily, so the stable operation cannot be performed. There is.
【０００８】本発明において解決すべき課題は、流動層
による粉状鉄鉱石の還元装置における気体搬送による還
元鉱石排出装置の欠点を解消して、還元鉱石の安定した
排出を可能とするための手段を見出すことにある。An object of the present invention is to solve the drawbacks of a reduced ore discharging device by gas transport in a reducing device for fine iron ore using a fluidized bed and to enable stable discharge of reduced ore. Is to find out.
【０００９】[0009]
【課題を解決するための手段】本発明は、流動層還元炉
の作動ガス吹込みノズルを備えた気体搬送型還元鉱石排
出装置であって、同気体搬送型還元鉱石排出装置に流動
層還元炉の炉内圧力との差圧を調整する加圧手段を設け
た。 SUMMARY OF THE INVENTION The present invention relates to a gas-conveying type reduced ore discharging apparatus provided with a working gas injection nozzle of a fluidized-bed reducing furnace. Pressure means for adjusting the pressure difference from the furnace pressure
Was.
【００１０】この加圧手段として、気体搬送型排出装置
の下流側に還元鉱石を貯留するホッパーを連結し、同ホ
ッパーにＮ2ガスのような不活性ガス導入による加圧装
置を設ける。この加圧装置は、流動層内圧力検出器とホ
ッパーの圧力検出器とを連絡して、その圧力差を検知し
て、差圧を一定に調節する差圧調節弁を設ける。[0010] As the pressurizing means, connecting the hopper for storing the reduced ore in the downstream side of the gas conveyor type discharge device, the ho
Providing a pressing apparatus with an inert gas inlet, such as N 2 gas wrapper. This pressurizing device has a pressure detector in the fluidized bed and a hose.
A differential pressure control valve is provided for communicating with the pressure detector of the upper to detect the pressure difference and adjusting the differential pressure to a constant value.
【００１１】また、ホッパーにロードセル等の計量器を
設けて還元鉱の排出量を管理して、気体搬送型排出装置
内のニューマチックフィーダに吹込む不活性ガスからな
るキャリアガス量をコントロールする流量調節装置を設
けることにより、還元鉱石の排出量をコントロールす
る。Further, a weighing device such as a load cell is provided in the hopper to control the amount of reduced ore discharged, and to control the amount of the carrier gas composed of the inert gas blown into the pneumatic feeder in the gas transfer type discharge device. By providing a control device, the amount of reduced ore emission is controlled.
【００１２】[0012]
【作用】気体搬送型排出装置の排出側の圧力と流動層内
の圧力を気体搬送型排出装置での炉内ガスの突出が生じ
ないような一定の差圧に調整することによって、流動層
内の圧力変動に影響を受けることがなく、安定した還元
鉱石の排出ができる。また、流動層内の圧力増大による
流動層内のガスが排出口から突出することが無くなる。The pressure in the fluidized bed is adjusted by adjusting the pressure on the discharge side of the gas-conveying type discharge device and the pressure in the fluidized bed to a constant pressure such that the gas in the furnace does not protrude in the gas-conveying type discharge device. The reduced ore can be discharged stably without being affected by the pressure fluctuation. Further, the gas in the fluidized bed does not protrude from the outlet due to the increase in the pressure in the fluidized bed.
【００１３】この場合、気体搬送型排出装置の排出側の
圧力を流動層内の圧力より高く調整する方が還元鉱石の
排出がより安定化する。In this case, the discharge of the reduced ore is more stabilized when the pressure on the discharge side of the gas transfer type discharge device is adjusted to be higher than the pressure in the fluidized bed.
【００１４】また、ホッパーに流動層還元炉から排出さ
れる還元鉱石を計量する計量器をホッパーに設け、還元
鉱石の排出量を気体搬送型排出装置内のニューマチック
フィーダに吹き込む不活性ガス量を流量調整装置により
調整するため、所定の生産量が安定して得られる。The hopper is discharged from the fluidized bed reduction furnace.
The hopper is equipped with a measuring device for measuring the reduced ore to be discharged, and the amount of reduced ore discharged is measured by a pneumatic
Since the amount of inert gas blown into the feeder is adjusted by the flow control device , a predetermined production amount can be stably obtained.
【００１５】[0015]
【実施例】図１は、本発明の排出装置１０を循環型の流
動層還元装置２０に適用した例を示す。FIG. 1 shows an example in which a discharge device 10 of the present invention is applied to a circulating fluidized bed reduction device 20.
【００１６】同図において、循環流動層還元装置２０
は、鉱石導入管２１と還元鉱石排出管２２を有するライ
ザー２３と、サイクロン２４とダウンカマー２５とから
構成される外部粒子循環装置２６とからなり、それぞれ
ライザー２３と外部粒子循環装置２６とは上部において
は循環導入管２７によって、下部においては連結管２８
で連結されている。２９はライザー２３への不活性のキ
ャリアガス導入管であって、同導入管２９からのキャリ
アガスは、一旦ガスヘッダー３０に導入され、そこから
通気性のノズル支持板３１を経てライザー２３内に噴出
される。図示されない溶融還元炉から、還元ガス導入管
３２によってライザー２３内に導入される還元ガスは、
床底板３３の下方に位置する還元ガスヘッダー３４を経
て、床底板３３面に均一に配置したノズル３５からライ
ザー２３内に導入される。In FIG. 1, a circulating fluidized bed reduction device 20
Comprises a riser 23 having an ore introduction pipe 21 and a reduced ore discharge pipe 22, and an external particle circulation device 26 composed of a cyclone 24 and a downcomer 25. At the bottom, the connecting pipe 28 at the bottom
Are connected by Reference numeral 29 denotes an inert carrier gas introduction pipe to the riser 23. The carrier gas from the introduction pipe 29 is once introduced into the gas header 30, and then introduced into the riser 23 through the air-permeable nozzle support plate 31. It is gushing. The reducing gas introduced from the smelting reduction furnace (not shown) into the riser 23 by the reducing gas introduction pipe 32 is
Through a reducing gas header 34 located below the floor bottom plate 33, the gas is introduced into the riser 23 from a nozzle 35 uniformly arranged on the floor bottom plate 33.
【００１７】同図において、本発明に係る還元鉱石排出
装置１０は、還元鉱石排出管２２に連結されたニューマ
チックフィーダ１の更に下流側に伸縮管２によって排出
弁３を有するホッパー４と連結されている。５はホッパ
ー４に設置された還元鉱石の重量を計量するためのロー
ドセルを示す。また、ホッパー４には加圧のためのＮ2
ガス導入管６が取付けられている。また、ニューマチッ
クフィーダ１にもキャリアガスとしてのＮ2 ガス導入管
７が設けられている。さらに８は流動層ライザー２３内
の圧力を検出するための炉圧検出器を示す。Referring to FIG. 1, a reduced ore discharging apparatus 10 according to the present invention is connected to a hopper 4 having a discharge valve 3 by a telescopic pipe 2 further downstream of a pneumatic feeder 1 connected to a reduced ore discharging pipe 22. ing. Reference numeral 5 denotes a load cell for weighing the reduced ore provided in the hopper 4. The hopper 4 has N 2 for pressurization.
A gas introduction pipe 6 is attached. The pneumatic feeder 1 is also provided with an N 2 gas introduction pipe 7 as a carrier gas. Reference numeral 8 denotes a furnace pressure detector for detecting the pressure in the fluidized bed riser 23.
【００１８】このような構成を有する本発明に係る排出
装置１０は以下の要領で作動する。循環流動層還元装置
２０へロータリーフィーダ等の手段で鉱石導入管２１を
経て粉鉱石を投入する。還元ガスはノズル３５から流動
層内へ吹き込まれ、鉱石を部分還元し、排ガスは循環導
入管２７からサイクロン装置２４を経て外部へ排出され
る。また、還元鉱石は還元鉱石排出管２２から排出さ
れ、その排出量はニューマチックフィーダ１によって制
御され、ホッパー４内で一時貯蔵する。ホッパー４は炉
圧検出器８による信号を受けた圧力調節弁９によって内
圧が調整される。ニューマチックフィーダ１での還元鉱
石の排出量の制御は、ニューマチックフィーダ１内にガ
ス導入管７を経て供給されるＮ2キャリアガスを流量調
整弁１１を加減することによって行われる。ホッパー４
に取付けられている計量器５は還元鉱石の排出量を計量
し、ホッパー４に収納される鉱石量が一定以上になる
と、その下方に設けられた排出弁３を作動して排出す
る。The discharge device 10 according to the present invention having such a configuration operates in the following manner. Fine ore is charged into the circulating fluidized bed reduction device 20 through an ore introduction pipe 21 by means such as a rotary feeder. The reducing gas is blown into the fluidized bed from the nozzle 35 to partially reduce the ore, and the exhaust gas is discharged from the circulation introduction pipe 27 to the outside through the cyclone device 24. Further, the reduced ore is discharged from the reduced ore discharge pipe 22, and the discharge amount is controlled by the pneumatic feeder 1 and temporarily stored in the hopper 4. The internal pressure of the hopper 4 is adjusted by a pressure control valve 9 which has received a signal from the furnace pressure detector 8. The amount of the reduced ore discharged from the pneumatic feeder 1 is controlled by adjusting the flow rate adjusting valve 11 for the N 2 carrier gas supplied through the gas introduction pipe 7 into the pneumatic feeder 1. Hopper 4
The meter 5 attached to the hopper measures the discharge amount of the reduced ore. When the amount of the ore stored in the hopper 4 exceeds a certain value, the discharge valve 3 provided below the hopper 4 is operated to discharge the ore.
【００１９】[0019]
【発明の効果】本発明によって、以下の効果を奏する。According to the present invention, the following effects can be obtained.
【００２０】（１）排出装置自体に回転部材が存在しな
いので、排出装置そのものに摩耗、腐食等によるトラブ
ルの発生がない。(1) Since there is no rotating member in the discharge device itself, there is no trouble due to wear, corrosion, etc. in the discharge device itself.
【００２１】（２）排出装置内への流動層内のガスの流
出量が少なく、装置全体の安全性が高い。(2) The amount of gas flowing out of the fluidized bed into the discharge device is small, and the safety of the entire device is high.
【００２２】（３）排出制御がより正確に可能となるの
で、装置全体の安定操業が可能となる。(3) Since discharge control can be performed more accurately, stable operation of the entire apparatus can be achieved.
【図１】本発明に係る排出装置を循環型の流動層還元装
置に適用した図を示す。FIG. 1 shows a diagram in which a discharge device according to the present invention is applied to a circulation type fluidized bed reduction device.
１０ 排出装置 ２０ 循環型の流動層還
元装置 ２１ 鉱石導入管 ２２ 還元鉱石排出口 ２３ ライザー ２４ サイクロン ２５ ダウンカマー ２６ 外部粒子循環装置 ２７ 循環導入管 ２８ 連結管 ２９ キャリアガス導入管 ３０ ガスヘッダー ３１ ノズル支持板 ３２ 還元ガス導入管 ３３ 床底板 ３４ 還元ガスヘッダー ３５ ノズル １ ニューマチックフィーダ ２ 伸縮管 ３ 排出弁 ４ ホッパー ５ 計量器 ６，７ Ｎ2ガス導入
管 ８ 炉圧検出器 ９ 圧力調節弁 １１ 流量調整弁DESCRIPTION OF SYMBOLS 10 Discharge apparatus 20 Circulating fluidized bed reduction apparatus 21 Ore introduction pipe 22 Reduced ore discharge port 23 Riser 24 Cyclone 25 Downcomer 26 External particle circulation apparatus 27 Circulation introduction pipe 28 Connecting pipe 29 Carrier gas introduction pipe 30 Gas header 31 Nozzle support Plate 32 Reduction gas introduction pipe 33 Floor bottom plate 34 Reduction gas header 35 Nozzle 1 Pneumatic feeder 2 Telescopic tube 3 Discharge valve 4 Hopper 5 Meter 6 and 7 N 2 gas introduction pipe 8 Furnace pressure detector 9 Pressure control valve 11 Flow rate adjustment valve
───────────────────────────────────────────────────── フロントページの続き (72)発明者 鈴木 悟 福岡県北九州市八幡東区枝光１−１−１ 新日本製鐵株式会社 第３技術研究所 内 (56)参考文献 特開 昭49−122414（ＪＰ，Ａ) 特開 昭62−228876（ＪＰ，Ａ) 特公 昭34−7209（ＪＰ，Ｂ１) (58)調査した分野(Int.Cl.6，ＤＢ名) C21B 11/00 C21B 13/00 101 F27B 15/09 ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Satoru Suzuki 1-1-1 Edamitsu, Yawatahigashi-ku, Kitakyushu-shi, Fukuoka Nippon Steel Corporation 3rd Technical Research Institute (56) References JP-A-49-122414 (JP, A) JP-A-62-228876 (JP, A) JP-B-34-7209 (JP, B1) (58) Fields investigated (Int. Cl. 6 , DB name) C21B 11/00 C21B 13 / 00 101 F27B 15/09
Claims (1)
る流動層還元炉において、 該流動層還元炉の下方に設けた還元鉱石排出口にニュー
マチックフィーダを連結し、 該ニューマチックフィーダの下流側に前記還元鉱石を貯
留するホッパーを連結し、 前記流動層還元炉の圧力と前記ホッパーの圧力を計測
し、前記流動層還元炉の圧力と前記ホッパーの圧力の差
圧を検知し、差圧を一定に調節する不活性ガスを導入す
る加圧装置を前記ホッパーに配設するとともに、 前記ホッパーに還元鉱石の重量を計量する計量器を配設
し、 還元鉱石の排出量を制御する不活性ガス量を調整する流
量調節装置を前記ニューマチックフィーダに配設したこ
とを特徴とする 流動層還元炉の還元鉱石排出装置。1. An ore injected with a working gas into a fluidized bed furnace to reduce ore.
Fluidized-bed reduction furnace, a new ore outlet provided below the fluidized-bed reduction furnace
A reduced feed ore is connected downstream of the pneumatic feeder.
Connecting the hopper to cut, measuring the pressure in the pressure with the hopper of the fluidized bed reduction furnace
And the difference between the pressure of the fluidized bed reduction furnace and the pressure of the hopper.
Detects pressure and introduces inert gas to regulate differential pressure
And a weighing device for weighing the reduced ore is provided in the hopper.
The stream mode to adjust the amount of inert gas to control the emissions of reduced ore
The amount adjustment device is installed in the pneumatic feeder.
A reduced ore discharging device for a fluidized bed reduction furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6666991A JP2968603B2 (en) | 1991-03-29 | 1991-03-29 | Reduced ore discharge device of fluidized bed reduction furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6666991A JP2968603B2 (en) | 1991-03-29 | 1991-03-29 | Reduced ore discharge device of fluidized bed reduction furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04301019A JPH04301019A (en) | 1992-10-23 |
| JP2968603B2 true JP2968603B2 (en) | 1999-10-25 |
Family
ID=13322548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6666991A Expired - Fee Related JP2968603B2 (en) | 1991-03-29 | 1991-03-29 | Reduced ore discharge device of fluidized bed reduction furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2968603B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100332927B1 (en) * | 1999-12-23 | 2002-04-20 | 이구택 | Apparatus for supplying the back-up gas in fluidized bed reactor |
-
1991
- 1991-03-29 JP JP6666991A patent/JP2968603B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04301019A (en) | 1992-10-23 |
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