JPH0730379B2 - Method for transferring high temperature powder - Google Patents
Method for transferring high temperature powderInfo
- Publication number
- JPH0730379B2 JPH0730379B2 JP20652391A JP20652391A JPH0730379B2 JP H0730379 B2 JPH0730379 B2 JP H0730379B2 JP 20652391 A JP20652391 A JP 20652391A JP 20652391 A JP20652391 A JP 20652391A JP H0730379 B2 JPH0730379 B2 JP H0730379B2
- Authority
- JP
- Japan
- Prior art keywords
- gas
- stand pipe
- pipe
- iron ore
- 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.)
- Expired - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
- B01J8/24—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique
- B01J8/38—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique with fluidised bed containing a rotatable device or being subject to rotation or to a circulatory movement, i.e. leaving a vessel and subsequently re-entering it
- B01J8/384—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique with fluidised bed containing a rotatable device or being subject to rotation or to a circulatory movement, i.e. leaving a vessel and subsequently re-entering it being subject to a circulatory movement only
- B01J8/388—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique with fluidised bed containing a rotatable device or being subject to rotation or to a circulatory movement, i.e. leaving a vessel and subsequently re-entering it being subject to a circulatory movement only externally, i.e. the particles leaving the vessel and subsequently re-entering it
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Manufacture Of Iron (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、溶融還元プロセスに
おいて予備還元された粉状鉄鉱石のような高温の粉粒体
を移送するための方法に関する。FIELD OF THE INVENTION This invention relates to a method for transferring hot granules such as pulverized iron ore that has been pre-reduced in a smelting reduction process.
【０００２】[0002]
【従来技術】鉄鉱石の溶融還元では、設備を溶融還元炉
と流動層式の予備還元炉とから構成し、溶融還元炉で発
生する排ガスを予備還元炉流動層の流動化、還元用ガス
として利用する方法が採られる。このような設備では、
予備還元炉の流動層から排出される排ガス中に多量の粉
状鉄鉱石が含まれ、この粉状鉄鉱石はサイクロンにより
排ガス中から回収された後、流動層に返送される。この
ような高温の粉状鉄鉱石を移送する方法としては、構造
の簡易性、トラブル発生時の対処のし易さ等の面から、
気体を用いて粉体を移送する所謂気送式の粉粒体移送装
置を用いることが好ましい。In the smelting reduction of iron ore, the equipment is composed of a smelting reduction furnace and a fluidized bed type preliminary reduction furnace, and the exhaust gas generated in the smelting reduction furnace is used as a gas for fluidizing and reducing the fluidized bed of the preliminary reduction furnace. The method used is adopted. With such equipment,
Exhaust gas discharged from the fluidized bed of the preliminary reduction furnace contains a large amount of powdery iron ore, which is recovered from the exhaust gas by a cyclone and then returned to the fluidized bed. As a method of transferring such high temperature powdered iron ore, from the viewpoint of the simplicity of the structure, the ease of handling when trouble occurs, etc.
It is preferable to use a so-called pneumatic transporting powdery or granular material transporting device that transports powder by using gas.
【０００３】従来、この種の気送式粉粒体移送装置は、
石炭燃焼流動層ボイラ−における石炭灰移送用として、
流動層装置の循環部において実用化されている。このよ
うな気送式移送装置の一形式として、図３に示すような
Ｌバルブ方式の装置が知られている。この装置は、スタ
ンドパイプ３１と、このスタンドパイプ３１の下端に連
設される水平管３２とから構成されるＬ字型の移送管で
あり、スタンドパイプの下部にガス吹き込みノズル３３
から窒素、空気等の気体を吹き込む（エアレ−ション）
ことにより粉粒体を定量移送するものである。Conventionally, this type of pneumatic conveying apparatus for powder and granular material has been used.
For transferring coal ash in a coal combustion fluidized bed boiler,
It has been put to practical use in the circulation section of a fluidized bed apparatus. As one type of such pneumatic transfer device, an L valve type device as shown in FIG. 3 is known. This device is an L-shaped transfer pipe composed of a stand pipe 31 and a horizontal pipe 32 continuously provided at the lower end of the stand pipe 31, and a gas blowing nozzle 33 is provided below the stand pipe.
Inject gas such as nitrogen and air from the air (air ratio)
As a result, the granular material is quantitatively transferred.
【０００４】[0004]
【発明が解決しようとする課題】しかし、このような気
送式粉粒体移送装置を上述したような予備還元炉におけ
る粉状鉄鉱石の移送に適用した場合、吹き込みガス（エ
アレ−ションガス）が流動層内の温度を低下させるとい
う問題がある。また、この吹き込みガスとしては通常窒
素ガス等が用いられるが、窒素のような鉱石の予備還元
に寄与しないガスを多量に吹き込むと、流動層内の還元
の効率性を悪化させるという問題もある。工業的規模の
予備還元炉での上記粉状鉄鉱石の移送量（循環量）は２
００ｔｏｎ／ｈにも及び、この移送量に見合うエアレ−
ションガス吹込量は１０００Ｎｍ3／ｈにも達すると見
込まれ、このような大量のガスが系内に吹き込まれた場
合、流動層内の温度や還元効率に与える影響は重大なも
のである。However, when such a pneumatic transfer device for powdery granular material is applied to transfer powdered iron ore in the preliminary reduction furnace as described above, a blowing gas (aeration gas) Has the problem of lowering the temperature in the fluidized bed. Nitrogen gas or the like is usually used as the blowing gas, but if a large amount of gas such as nitrogen that does not contribute to the preliminary reduction of the ore is blown, there is a problem that the efficiency of the reduction in the fluidized bed is deteriorated. The transfer amount (circulation amount) of the above-mentioned powdery iron ore in an industrial scale preliminary reduction furnace is 2
Air tons that reach 00ton / h and match the transfer rate
The amount of ion gas blown is expected to reach 1000 Nm 3 / h, and when such a large amount of gas is blown into the system, the influence on the temperature in the fluidized bed and the reduction efficiency is significant.
【０００５】本発明はこのような問題に鑑みなされたも
ので、特に粉粒体を系内で循環移送させるような場合、
系内の温度低下を生じさせることなく粉粒体の移送を行
うことができる方法を提供しようとするものである。ま
た、本発明の他の目的は、溶融還元設備の予備還元炉に
おいて、炉排ガスからサイクロンにより回収された粉状
鉄鉱石を流動層に返送するに当たり、気送用ガスによる
流動層の温度低下を適切に防止し、且つ流動層の還元効
率に影響を与えることなく粉状鉄鉱石を流動層内に移送
することができる方法を提供しようとするものである。The present invention has been made in view of the above problems, and in particular, in the case of circulating and transferring powdery particles in the system,
An object of the present invention is to provide a method capable of transferring powder particles without causing a temperature drop in the system. Another object of the present invention is to reduce the temperature of the fluidized bed due to gas for gas transportation when returning the powdery iron ore recovered by the cyclone from the furnace exhaust gas to the fluidized bed in the preliminary reduction furnace of the smelting reduction equipment. It is an object of the present invention to provide a method capable of appropriately preventing and pulverizing iron ore into a fluidized bed without affecting the reduction efficiency of the fluidized bed.
【０００６】[0006]
【課題を解決するための手段】上記のような目的を達成
するため、本発明は以下のような構成を有する。 （１）スタンドパイプと、該スタンドパイプの下端に連
設される水平管と、スタンドパイプ下部に気送用ガスを
吹き込むためのガス吹き込み装置とからなるＬバルブ方
式の粉粒体移送装置により高温の粉粒体を移送する方法
において、高温プロセスガスを気送用ガスとしてスタン
ドパイプ内に吹き込むことを特徴とする高温粉粒体の移
送方法。In order to achieve the above object, the present invention has the following configuration. (1) High temperature by an L valve type powder and granular material transfer device including a stand pipe, a horizontal pipe connected to the lower end of the stand pipe, and a gas blowing device for blowing an air feeding gas to the lower part of the stand pipe. In the method for transferring powder and granules, the method for transferring high temperature powder and granules, characterized in that the high-temperature process gas is blown into the stand pipe as a gas for air feeding.
【０００７】（２）溶融還元設備における予備還元炉の
排ガスからサイクロンにより回収された粉状鉄鉱石を、
スタンドパイプと、該スタンドパイプの下端に連設され
る水平管と、スタンドパイプ下部に気送用ガスを吹き込
むためのガス吹き込み装置とからなるＬバルブ方式の粉
粒体移送装置により予備還元炉に移送する方法におい
て、前記サイクロンによる粉状鉄鉱石回収後の高温排ガ
スを気送用ガスとしてスタンドパイプ内に吹き込むこと
を特徴とする予備還元炉における粉状鉄鉱石の移送方
法。(2) The powdery iron ore recovered by the cyclone from the exhaust gas of the preliminary reduction furnace in the smelting reduction equipment is
The L-valve type powder and granular material transfer device comprising a stand pipe, a horizontal pipe continuously provided at the lower end of the stand pipe, and a gas blowing device for blowing the gas for air feeding into the lower portion of the stand pipe is used to form the preliminary reduction furnace. A method of transferring powdery iron ore in a preliminary reduction furnace, characterized in that the high-temperature exhaust gas after the recovery of the powdery iron ore by the cyclone is blown into a stand pipe as an air-carrying gas.
【０００８】[0008]
【実施例】図１および図２は、本発明を溶融還元プロセ
スにおける予備還元炉の粉状鉄鉱石の移送に適用した場
合の一実施例を示すもので、１は予備還元炉、２は該予
備還元炉から排出された排ガス中の粉状鉄鉱石を回収除
去するためのサイクロン、４は排ガス導管、３は前記サ
イクロン２により回収された粉状鉄鉱石を予備還元炉に
移送するための移送装置である。1 and 2 show an embodiment in which the present invention is applied to the transfer of powdered iron ore in a preliminary reduction furnace in a smelting reduction process. Cyclone for recovering and removing the powdery iron ore in the exhaust gas discharged from the preliminary reduction furnace, 4 is an exhaust gas conduit, 3 is a transfer for transferring the powdery iron ore recovered by the cyclone 2 to the preliminary reduction furnace It is a device.
【０００９】前記移送装置３は、サイクロン２に接続さ
れたスタンドパイプ３１と、一端がこのスタンドパイプ
の下端に連設され、他端が予備還元炉１に接続された水
平管３２と、前記スタンドパイプの下部に気送用ガスを
吹き込むためのガス吹き込みノズル３３とから構成され
ている。The transfer device 3 includes a stand pipe 31 connected to the cyclone 2, a horizontal pipe 32 having one end connected to the lower end of the stand pipe and the other end connected to the preliminary reduction furnace 1, and the stand. It is composed of a gas injection nozzle 33 for injecting a gas for air delivery to the lower part of the pipe.
【００１０】溶融還元炉の生成ガスはガス導管８を通じ
て予備還元炉１に導入され、予備還元炉１内で鉄鉱石の
流動層を形成する。粉状鉄鉱石を多量に含む流動層の反
応ガスは排ガス導管４を通じて系外に排出されるが、こ
の際、サイクロン２によりガス中に含まれる粉状鉄鉱石
が回収除去され、この粉状鉄鉱石が移送装置３により予
備還元炉１内に返送される。本発明では、排ガス導管４
を通じて排出される排ガスの一部を導管５を通じて前記
移送装置３のガス吹き込みノズル３３に供給する。通
常、このガス温度は８００℃程度であり、このような高
温の予備還元炉排ガスを気送用ガスとして用いることに
より、流動層内の温度低下と流動層の還元効率の低下を
適切に防止することができる。なお、その他図面におい
て、７は除塵装置である。The gas produced in the smelting reduction furnace is introduced into the preliminary reduction furnace 1 through the gas conduit 8 and forms a fluidized bed of iron ore in the preliminary reduction furnace 1. The reaction gas in the fluidized bed containing a large amount of powdery iron ore is discharged out of the system through the exhaust gas conduit 4. At this time, the cyclone 2 recovers and removes the powdery iron ore contained in the gas, and the powdery iron ore The stones are returned to the preliminary reduction furnace 1 by the transfer device 3. In the present invention, the exhaust gas conduit 4
A part of the exhaust gas discharged through the above is supplied to the gas injection nozzle 33 of the transfer device 3 through the conduit 5. Usually, this gas temperature is about 800 ° C. By using such a high-temperature pre-reduction furnace exhaust gas as a gas for pneumatic transportation, it is possible to appropriately prevent the temperature drop in the fluidized bed and the reduction efficiency of the fluidized bed. be able to. In addition, in other drawings, 7 is a dust removing device.
【００１１】[0011]
【発明の効果】以上述べた本発明によれば、系内の温度
低下を適切に防止しつつ高温の粉粒体の移送を行うこと
ができる。また、溶融還元設備の予備還元炉において、
炉排ガスから回収された粉状鉄鉱石を、流動層の温度低
下や流動層の還元効率の低下を生じさせることなく、流
動層に移送することができる。According to the present invention described above, it is possible to transfer high-temperature powder particles while appropriately preventing a temperature drop in the system. Also, in the preliminary reduction furnace of the smelting reduction equipment,
The powdery iron ore recovered from the furnace exhaust gas can be transferred to the fluidized bed without lowering the temperature of the fluidized bed and the reduction efficiency of the fluidized bed.
【図１】本発明の一実施例を示す説明図FIG. 1 is an explanatory diagram showing an embodiment of the present invention.
【図２】図１における鉱石移送装置の詳細を示す説明図FIG. 2 is an explanatory view showing details of the ore transfer device in FIG.
【図３】従来用いられている粉粒体移送装置の説明図FIG. 3 is an explanatory view of a conventionally used powder / granular material transfer device.
１…予備還元炉、２…サイクロン、３…移送装置、４…
排ガス導管、５…ガス導管、３１…スタンドパイプ、３
２…水平管、３３…ガス吹き込みノズル1 ... Preliminary reduction furnace, 2 ... Cyclone, 3 ... Transfer device, 4 ...
Exhaust gas pipe, 5 ... Gas pipe, 31 ... Stand pipe, 3
2 ... Horizontal pipe, 33 ... Gas blowing nozzle
───────────────────────────────────────────────────── フロントページの続き (72)発明者 有山 達郎 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 (72)発明者 小島 理 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tatsuro Ariyama 1-2-2 Marunouchi, Chiyoda-ku, Tokyo Inside Nihon Kokan Co., Ltd. (72) Inventor Osamu Kojima 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd.
Claims (2)
下端に連設される水平管と、スタンドパイプ下部に気送
用ガスを吹き込むためのガス吹き込み装置とからなるＬ
バルブ方式の粉粒体移送装置により高温の粉粒体を移送
する方法において、高温プロセスガスを気送用ガスとし
てスタンドパイプ内に吹き込むことを特徴とする高温粉
粒体の移送方法。1. An L comprising a stand pipe, a horizontal pipe continuously provided at a lower end of the stand pipe, and a gas blowing device for blowing a gas for air feeding to a lower portion of the stand pipe.
What is claimed is: 1. A method for transferring a high temperature powder or granular material by a valve type powder or granular material transfer device, wherein a high temperature process gas is blown into a stand pipe as a gas for pneumatic transportation.
スからサイクロンにより回収された粉状鉄鉱石を、スタ
ンドパイプと、該スタンドパイプの下端に連設される水
平管と、スタンドパイプ下部に気送用ガスを吹き込むた
めのガス吹き込み装置とからなるＬバルブ方式の粉粒体
移送装置により予備還元炉に移送する方法において、前
記サイクロンによる粉状鉄鉱石回収後の高温排ガスを気
送用ガスとしてスタンドパイプ内に吹き込むことを特徴
とする予備還元炉における粉状鉄鉱石の移送方法。2. A powder iron ore recovered by a cyclone from the exhaust gas of a preliminary reduction furnace in a smelting reduction facility is pneumatically transferred to a stand pipe, a horizontal pipe connected to the lower end of the stand pipe, and a lower part of the stand pipe. In a method of transferring to a preliminary reduction furnace by an L valve type powder and granular material transfer device comprising a gas injection device for injecting an industrial gas, the high temperature exhaust gas after the recovery of the powdery iron ore by the cyclone is used as a pneumatic gas stand. A method for transferring powdered iron ore in a pre-reduction furnace characterized by being blown into a pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20652391A JPH0730379B2 (en) | 1991-07-23 | 1991-07-23 | Method for transferring high temperature powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20652391A JPH0730379B2 (en) | 1991-07-23 | 1991-07-23 | Method for transferring high temperature powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0525523A JPH0525523A (en) | 1993-02-02 |
| JPH0730379B2 true JPH0730379B2 (en) | 1995-04-05 |
Family
ID=16524778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20652391A Expired - Lifetime JPH0730379B2 (en) | 1991-07-23 | 1991-07-23 | Method for transferring high temperature powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0730379B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5339774A (en) * | 1993-07-06 | 1994-08-23 | Foster Wheeler Energy Corporation | Fluidized bed steam generation system and method of using recycled flue gases to assist in passing loopseal solids |
| JP2006118058A (en) * | 2004-10-19 | 2006-05-11 | Kyoto Ichi | Carbon fiber monofilament knitting structure |
-
1991
- 1991-07-23 JP JP20652391A patent/JPH0730379B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0525523A (en) | 1993-02-02 |
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