JPH01196492A - Exhaust gas duct for melt-reducing furnace - Google Patents
Exhaust gas duct for melt-reducing furnaceInfo
- Publication number
- JPH01196492A JPH01196492A JP2085888A JP2085888A JPH01196492A JP H01196492 A JPH01196492 A JP H01196492A JP 2085888 A JP2085888 A JP 2085888A JP 2085888 A JP2085888 A JP 2085888A JP H01196492 A JPH01196492 A JP H01196492A
- Authority
- JP
- Japan
- Prior art keywords
- duct
- furnace
- exhaust gas
- inlet
- furnace body
- 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.)
- Pending
Links
- 230000009467 reduction Effects 0.000 claims description 27
- 238000003723 Smelting Methods 0.000 claims description 19
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 abstract description 6
- 238000005452 bending Methods 0.000 abstract description 2
- 239000000155 melt Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 47
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 14
- 239000002184 metal Substances 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 11
- 238000010079 rubber tapping Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 10
- 239000002893 slag Substances 0.000 description 8
- 229910052742 iron Inorganic materials 0.000 description 7
- 230000007246 mechanism Effects 0.000 description 6
- 238000007664 blowing Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000005192 partition Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 229910000805 Pig iron Inorganic materials 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
Landscapes
- Manufacture Of Iron (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、溶融還元炉の炉口と排ガスダクトとの間の継
手部の気密性を破ることなく、炉体を傾動させて出湯を
行うことが可能な溶融還元炉用排ガスダクトに関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention enables tapping of hot water by tilting the furnace body without breaking the airtightness of the joint between the furnace mouth and the exhaust gas duct of the smelting reduction furnace. This invention relates to an exhaust gas duct for a smelting reduction furnace.
鉄鉱石を還元して溶銑を製造するため、高炉を使用する
方法、シャフト炉で還元した鉄鉱石原料を電気炉で溶解
する方法等が従来から採用されている。ところが、高炉
法においては、大規模な設備が必要とされる。また、強
粘結炭を乾留したコークスや鉄源として焼結鉱を使用す
るため、コークス炉設備や焼結設備等の付帯設備が必要
とされる。したがって、多大な設備費は勿論のこと、多
くのエネルギー及び労働力を必要とし、処理コストの高
騰を招くという欠点があった。他方、シャフト炉により
鉄鉱石を還元する方法においては、鉄鉱石をペレット化
する前処理が必要となり、また還元材及び熱源として高
価な天然ガスを多量に消費するという欠点がある。In order to reduce iron ore to produce hot metal, methods such as using a blast furnace and melting iron ore raw material reduced in a shaft furnace in an electric furnace have been adopted. However, the blast furnace method requires large-scale equipment. Furthermore, since sintered ore is used as the iron source and coke produced by carbonization of strongly caking coal, additional equipment such as coke oven equipment and sintering equipment is required. Therefore, there is a drawback that not only a large amount of equipment costs but also a large amount of energy and labor are required, leading to a rise in processing costs. On the other hand, the method of reducing iron ore using a shaft furnace requires pre-treatment to pelletize the iron ore, and has the disadvantage that it consumes a large amount of expensive natural gas as a reducing agent and heat source.
このような従来の溶銑製造技術に代わるものとして、溶
融還元法が注目を浴びている。この方法で使用する溶融
還元炉は、使用する原料に制約を受けることなく、より
小規模な設備によって鉄系合金の溶湯を製造することを
目的として開発されたものであり、たとえば特願昭61
−86794号に開示されたような転炉、混銑炉型等が
ある。As an alternative to such conventional hot metal production techniques, the smelting reduction method is attracting attention. The smelting reduction furnace used in this method was developed for the purpose of producing molten iron alloys using smaller-scale equipment without being restricted by the raw materials used.
There are converters, mixed pig iron furnaces, etc. as disclosed in No.-86794.
また、本発明者等は、この種の溶融還元炉において、吹
錬作業を中断することなく出湯を行うことを開発し、特
願昭62−235893号として出願した。In addition, the present inventors have developed a method for tapping hot water without interrupting the blowing operation in this type of smelting reduction furnace, and filed the application as Japanese Patent Application No. 62-235893.
この先願で開示した溶融還元炉は、たとえば混銑炉型に
おいては、その円周方向に伸びるランス挿入用の開口を
炉殻に形成し、−炉体の傾動に係わりなくランスを炉内
に挿通可能に維持している。In the smelting reduction furnace disclosed in this prior application, for example, in the case of a mixed iron furnace type, an opening for inserting a lance extending in the circumferential direction is formed in the furnace shell, so that the lance can be inserted into the furnace regardless of the tilting of the furnace body. is maintained.
出湯時に吹錬作業を中断しないため、操業条件が安定化
することは勿論、溶融還元炉から排出される排ガス及び
排熱の量的な変動を低く抑えることができる。そのため
、この排ガス及び排熱を利用する予備還元炉、予熱炉、
熱回収ボイラー等の稼動状態を大きく変えることがなく
なる。Since the blowing operation is not interrupted during tapping, not only the operating conditions are stabilized, but also quantitative fluctuations in the exhaust gas and exhaust heat discharged from the smelting reduction furnace can be suppressed. Therefore, there are preliminary reduction furnaces, preheating furnaces, and
This eliminates the need to significantly change the operating conditions of heat recovery boilers, etc.
ところが、このように炉体を傾動させて出湯を行う場合
、炉口と排ガスフードとを切り離すことが必要となる。However, when tapping the metal by tilting the furnace body in this manner, it is necessary to separate the furnace opening and the exhaust gas hood.
この切り離し時に、炉口と排ガスフードとの間から排ガ
ス及び排熱が流出し、作業環境を悪化させたり、還元成
分や熱量の逸散が生じ易い。或いは、排ガスフード内に
外気が吸引されるとき、予備還元炉、予熱炉、熱回収ボ
イラー等の後工程に送られる排ガスの成分が変わり、ま
た熱量が低下することにもなる。At this time of separation, exhaust gas and exhaust heat flow out from between the furnace mouth and the exhaust gas hood, which tends to deteriorate the working environment and cause reduction components and heat to dissipate. Alternatively, when outside air is drawn into the exhaust gas hood, the components of the exhaust gas sent to subsequent processes such as the pre-reduction furnace, preheating furnace, and heat recovery boiler change, and the amount of heat decreases.
すなわち、単に炉体と排ガスフードを接続する形式では
、吹錬作業を中断させることなく出湯を行うことによる
長所を充分に活用することができない。また、これまで
のところ、炉体の傾動時に炉口と排ガスフードとの間の
気密接続を図る具体的な手段も提案されていない。That is, by simply connecting the furnace body and the exhaust gas hood, it is not possible to fully utilize the advantages of tapping the hot water without interrupting the blowing operation. Furthermore, no specific means has been proposed so far for establishing an airtight connection between the furnace mouth and the exhaust gas hood when the furnace body is tilted.
そこで、本発明は、排ガスダクトを多関節とすることに
より、炉体を傾動させた場合にも炉口に排ガスダクトの
入側を気密接続させ、排ガス及び排熱の外部への流出や
外気の吸引等を防止することを目的とする。Therefore, by making the exhaust gas duct multi-jointed, the inlet side of the exhaust gas duct is airtightly connected to the furnace mouth even when the furnace body is tilted, thereby preventing exhaust gas and exhaust heat from flowing out and preventing outside air from flowing out. The purpose is to prevent suction, etc.
本発明の溶融還元炉用排ガスダクトは、その目的を達成
するために、溶融還元炉の炉口に気密且つ回転可能に接
続された入側部と、ダクトの途中に設けられた少なくと
も2以上の可動節とを備えていることを特徴とする。In order to achieve the purpose, the exhaust gas duct for a smelting reduction furnace of the present invention has an inlet part airtightly and rotatably connected to the mouth of the smelting reduction furnace, and at least two or more parts provided in the middle of the duct. It is characterized by having a movable joint.
ここで、排ガスダクトの入側部及び可動節としては、球
面継手構造、ベローズを備えた伸縮管。Here, the inlet side and movable joint of the exhaust gas duct is an extensible pipe with a spherical joint structure and bellows.
回転継手等が使用される。また、炉口に入側ダクト部を
固定的に配置し、この入側ダクト部から出側ダクト部ま
での間に、3個以上の可動節を設けることもできる。Rotary joints etc. are used. Alternatively, the inlet duct part of the furnace mouth may be fixedly arranged, and three or more movable joints may be provided between the inlet duct part and the outlet duct part.
溶融還元法においては、従来の転炉吹錬等の場合と異な
り、炉内に比較的多量の溶融金属を種湯として残留させ
ておくことが精錬上望ましい。したがって、出湯は、従
来の転炉出鋼のように炉体を水平に近い状態まで傾ける
ことなく、おおよそ30度以内の傾斜角度で行われる。In the smelting reduction method, unlike conventional converter blowing, it is desirable for refining to leave a relatively large amount of molten metal remaining in the furnace as a seed metal. Therefore, tapping is performed at an inclination angle of approximately 30 degrees or less, without tilting the furnace body to a nearly horizontal state as in conventional converter tapping.
そこで、この傾斜角度の範囲内で、排ガスダクトの入側
が常に溶融還元炉の炉口に気密接続されるように、排ガ
スダクトを多関節構造にしている。Therefore, the exhaust gas duct has a multi-joint structure so that the inlet side of the exhaust gas duct is always hermetically connected to the furnace mouth of the smelting-reduction furnace within this angle of inclination.
この多関節構造によって、炉体の傾動に起因する排ガス
ダクトの角度及び位置変化は、各関節の角度変化及び関
節間のダクト部分の位置変化として吸収される。したが
って、排ガスダクトの入側が常に溶融還元炉の炉口に気
密接続され、且つ予備還元炉、予熱炉、排熱ボイラー等
に繋がる固定部に対しても気密接続される。その結果、
出湯時に炉体を傾動させた場合にも、炉内に発生した排
ガス及び排熱が外部に逸散することなく、また外気が排
ガスフードに侵入することもない。With this multi-joint structure, changes in the angle and position of the exhaust gas duct due to tilting of the furnace body are absorbed as changes in the angle of each joint and changes in the position of the duct portion between the joints. Therefore, the inlet side of the exhaust gas duct is always hermetically connected to the furnace mouth of the smelting reduction furnace, and is also hermetically connected to the fixed part connected to the preliminary reduction furnace, preheating furnace, waste heat boiler, etc. the result,
Even when the furnace body is tilted during tapping, the exhaust gas and exhaust heat generated in the furnace do not dissipate to the outside, and outside air does not enter the exhaust gas hood.
以下、図面を参照しながら、実施例により本発明の特徴
を具体的に説明する。Hereinafter, the features of the present invention will be specifically explained using examples with reference to the drawings.
第1図は、第1実施例における排ガスダクトを備えた溶
融還元炉を示す概略図である。FIG. 1 is a schematic diagram showing a smelting reduction furnace equipped with an exhaust gas duct in a first embodiment.
本実施例においては、転炉形の溶融還元炉を使用してい
る。この炉本体1には、常に所定量以上の溶融金属浴2
が蓄えられており、溶融金属浴2の上面をスラグ層3で
覆っている。炉内に投入された鉄鉱石は、これら溶融金
属浴2及びスラグ層3と接触反応して、溶融還元される
。その結果、吹錬の継続に伴って、溶融金属浴2が増量
し、その高さが高くなる。そこで、この増量分を出湯口
4から出湯する。また、スラグ層3が厚くなったときに
は、出滓口5から適宜出滓する。In this embodiment, a converter type melting reduction furnace is used. This furnace body 1 always contains a molten metal bath 2 of a predetermined amount or more.
is stored, and the upper surface of the molten metal bath 2 is covered with a slag layer 3. The iron ore charged into the furnace comes into contact with the molten metal bath 2 and the slag layer 3, and is melted and reduced. As a result, as the blowing continues, the amount of the molten metal bath 2 increases and its height increases. Therefore, this increased amount is discharged from the tap water outlet 4. Further, when the slag layer 3 becomes thick, the slag is appropriately discharged from the slag outlet 5.
炉本体1の炉口6は、図示するように球面凸状に成形さ
れている。他方、この炉口6に接触する排ガスダクト7
0入側部8は、球面凹状のフランジに成形している。そ
して、スプリング、油圧等の加圧機構9で、入側部8を
炉口6に圧着している。このように、炉口6と入側部8
との間を球面継手とすることにより、炉本体1の傾動に
伴って炉口6の位置が多少ずれた場合にも、排ガスダク
ト7の屈曲により炉本体1の変位が吸収される。The furnace mouth 6 of the furnace body 1 is formed into a spherical convex shape as shown in the figure. On the other hand, an exhaust gas duct 7 that contacts this furnace port 6
The 0-input side portion 8 is formed into a spherical concave flange. Then, the inlet side portion 8 is pressed against the furnace mouth 6 by a pressure mechanism 9 such as a spring or hydraulic pressure. In this way, the furnace opening 6 and the entrance part 8
By using a spherical joint between the furnace body 1 and the furnace body 1, even if the position of the furnace mouth 6 is slightly shifted due to the tilting of the furnace body 1, the displacement of the furnace body 1 is absorbed by the bending of the exhaust gas duct 7.
したがって、炉本体1と排ガスダクト7との間の気密性
が維持される。Therefore, airtightness between the furnace body 1 and the exhaust gas duct 7 is maintained.
排ガスダクト7は、入側ダクト部7a、 中間ダクト
部7b及び固定式の出側ダクト部7Cから構成されてい
る。それぞれのダクト部7a〜7Cは、水冷構造(図示
せず)を備えた鋼製で、内部を通過する排ガスの熱に耐
える構造になっている。そして、入側ダクト部7aと中
間ダクト部7bとの間の継手10及び中間ダクト部7b
と出側ダクト部7Cとの間の継手11も、炉口6と入側
部8との関係と同様に球面継手構造となっている。なお
、第1図における記号r1゜r2. r3は、これら
球面継手構造の曲率半径を示す。The exhaust gas duct 7 includes an inlet duct part 7a, an intermediate duct part 7b, and a fixed outlet duct part 7C. Each of the duct parts 7a to 7C is made of steel and has a water cooling structure (not shown), and has a structure that can withstand the heat of the exhaust gas passing through the inside. A joint 10 between the inlet duct part 7a and the intermediate duct part 7b and the intermediate duct part 7b
The joint 11 between the outlet duct portion 7C and the outlet duct portion 7C also has a spherical joint structure similar to the relationship between the furnace mouth 6 and the inlet portion 8. Note that the symbols r1°r2. in FIG. r3 indicates the radius of curvature of these spherical joint structures.
また、固定式の出側ダクト部7Cの下流側には、炉本体
1から排出された粉塵を回収するサイクロン12、微粉
を除去して排ガスを清浄化するバグフィルタ13等の回
収・浄化設備が設けられている。In addition, on the downstream side of the fixed outlet duct section 7C, there are collection and purification equipment such as a cyclone 12 for collecting dust discharged from the furnace body 1 and a bag filter 13 for removing fine powder and purifying the exhaust gas. It is provided.
これら設備により浄化された排ガスは、ブロア14によ
って煙突15から放出される。なお、この排気経路の途
中に、予備還元炉、予熱炉、排熱ボイラー等を設けて、
排ガス及び排熱の有効利用を図ることは従来と同様であ
り、第1図においてはこれらを省略している。The exhaust gas purified by these facilities is discharged from the chimney 15 by the blower 14. In addition, a preliminary reduction furnace, preheating furnace, exhaust heat boiler, etc. are installed in the middle of this exhaust route.
The effective use of exhaust gas and exhaust heat is the same as in the prior art, and these are omitted in FIG.
出湯時に炉本体1を傾動させると、第2図に示すように
、炉口6の回転に追従して入側部8が移動する。この移
動で、入側ダクト部7aが傾斜し、その傾斜を相殺する
ように中間ダクト部7bが傾斜する。このように、炉本
体1の傾動に拘らず、炉口6と入側部8と間の気密性が
維持され、排ガス及び排熱が固定式の出側ダクト部7C
に導かれる。When the furnace body 1 is tilted during tapping, the entry side portion 8 moves following the rotation of the furnace mouth 6, as shown in FIG. With this movement, the inlet duct portion 7a is inclined, and the intermediate duct portion 7b is inclined so as to offset the inclination. In this way, regardless of the tilting of the furnace body 1, the airtightness between the furnace mouth 6 and the inlet part 8 is maintained, and the exhaust gas and waste heat are transferred to the fixed outlet duct part 7C.
guided by.
ここで、入側ダクト部7aと中間ダクト部7bとの間に
継手10を設けているため、炉本体1の変位が直接大き
な移動量となって固定式の出側ダクト部7Cに影響を与
えることがない。Here, since the joint 10 is provided between the inlet duct part 7a and the intermediate duct part 7b, the displacement of the furnace body 1 directly becomes a large amount of movement and affects the fixed outlet duct part 7C. Never.
なお、排ガスダクト7に設ける関節は、多ければ多いほ
ど炉本体1の変位に精度良く対応することが可能となる
。しかし、排ガスダクト7の構造自体の複雑化を招くこ
とから、実用的には炉口6と入側部8との間の継手を含
めて3〜4個程度にすることが好ましい。Note that the more joints the exhaust gas duct 7 has, the more accurately it can respond to the displacement of the furnace body 1. However, since this complicates the structure of the exhaust gas duct 7 itself, it is practically preferable to have about 3 to 4 joints including the joint between the furnace mouth 6 and the inlet part 8.
第3図は、ベローズを備えた関節を採用した第2実施例
を示す。FIG. 3 shows a second embodiment employing a joint with bellows.
本実施例においては、炉本体1の炉口6に水冷仕切り管
21を密に接続し、炉口6と入側ダクト部7aとに繋が
るベローズ22を水冷仕切り管21の周囲に設けている
。水冷仕切り管21により、入側ダクト部7aの内部を
上昇する排ガスの熱がベローズ22に与える影響を抑制
している。ベローズ22としては、耐熱鋼製又は耐熱布
製のものが使用される。In this embodiment, a water-cooled partition pipe 21 is tightly connected to the furnace mouth 6 of the furnace body 1, and a bellows 22 that connects the furnace mouth 6 and the inlet duct portion 7a is provided around the water-cooled partition pipe 21. The water-cooled partition pipe 21 suppresses the influence of the heat of the exhaust gas rising inside the inlet duct portion 7a on the bellows 22. The bellows 22 is made of heat-resistant steel or heat-resistant cloth.
このようにして、炉本体1と入側ダクト部7aとの間に
、第1関節23が設けられる。In this way, the first joint 23 is provided between the furnace body 1 and the inlet duct portion 7a.
また、入側ダクト部7aと中間ダクト部7bとの間及び
中間ダクト部7bと出側ダクト部7Cとの間にも同様な
ベローズ22を備えた第2関節24及び第3関節25が
設けられる。なお、ベローズ22の熱的保護を図るため
、ベローズ22に水冷機構を取り付けることもできる。Further, a second joint 24 and a third joint 25 having similar bellows 22 are provided between the inlet duct part 7a and the intermediate duct part 7b and between the intermediate duct part 7b and the outlet duct part 7C. . Note that in order to thermally protect the bellows 22, a water cooling mechanism may be attached to the bellows 22.
第4図は、この形式の関節をもつ排ガスダクトが、炉本
体1の傾動に追従して屈曲している状態を示す。この場
合、炉本体1の変位は、入側ダクト部7aと中間ダクト
部7bの傾斜に加えてベローズ22の伸縮によっても吸
収されるため、微細な動きに対応することができる。FIG. 4 shows a state in which an exhaust gas duct having this type of joint is bent to follow the tilting movement of the furnace body 1. In this case, the displacement of the furnace body 1 is absorbed by the expansion and contraction of the bellows 22 in addition to the inclination of the inlet duct part 7a and the intermediate duct part 7b, so that it is possible to cope with minute movements.
第5図は、回転継手を採用した第3実施例を示す。なお
、本例の場合は、溶融還元炉として混銑炉型を使用して
いる。FIG. 5 shows a third embodiment employing a rotary joint. In this example, a mixed pig iron furnace type is used as the smelting reduction furnace.
溶融還元炉の炉本体1は、回転機構51により炉軸を中
心として回転自在になっている。そして、炉本体1の炉
壁に入側ダクト部52を取り付けている。この入側ダク
ト部52に、中間ダクト部53.54及び固定式の出側
ダクト部55が回転継手56.57及び58によって順
次接続されている。これら回転継手56.57.58と
しては、いわゆるスイベルジヨイントと称される構造が
使用される。The furnace body 1 of the melting reduction furnace is rotatable about the furnace axis by a rotation mechanism 51. An inlet duct portion 52 is attached to the furnace wall of the furnace body 1. An intermediate duct section 53,54 and a fixed outlet duct section 55 are successively connected to this inlet duct section 52 by rotary joints 56, 57 and 58. As these rotary joints 56, 57, and 58, a structure called a so-called swivel joint is used.
入側ダクト部52は、第6図の断面図で示すように、炉
本体1の炉口に設けた一フランジ59に当接する端面を
もち、スプリング、油圧シリンダ等の加圧手段によって
フランジ59に押し付は又はクランプされている。そし
て、出湯時には、炉本体1の炉壁に設けた出湯口60か
ら溶融金属を流出させるため、回転機構51で炉本体1
を回転させる。As shown in the cross-sectional view of FIG. 6, the inlet duct portion 52 has an end surface that comes into contact with a flange 59 provided at the furnace mouth of the furnace body 1, and is pressed against the flange 59 by a pressurizing means such as a spring or a hydraulic cylinder. Pressing or clamping. At the time of tapping, the rotating mechanism 51 rotates the furnace body 1 in order to flow out the molten metal from the tap hole 60 provided on the furnace wall of the furnace body 1.
Rotate.
この回転に伴って、フランジ59が一点鎖線或いは二点
鎖線で示したように傾動し、その動きに入側ダクト部5
2も追従する。この入側ダク) 952の動きに引っ張
られて、中間ダクト部53.54も変位する。このとき
、回転継手56.57.58で入側ダクト部52に対す
る中間ダクト部53の角度、中間ダクト部53に対する
中間ダクト部54の角度、中間ダクト部54に対する出
側ダクト部55の角度が変わる。Along with this rotation, the flange 59 tilts as shown by the one-dot chain line or the two-dot chain line, and this movement causes the inlet duct portion 5
2 also follows. Pulled by the movement of this inlet duct) 952, the intermediate duct portions 53 and 54 are also displaced. At this time, the angle of the intermediate duct part 53 with respect to the inlet duct part 52, the angle of the intermediate duct part 54 with respect to the intermediate duct part 53, and the angle of the outlet duct part 55 with respect to the intermediate duct part 54 change at the rotary joints 56, 57, and 58. .
したがって、入側ダクト部52の下流側端部と固定式の
出側ダクト部55の入側端部との直線距離が変わっても
、その変位景は、各中間ダクト部53.54の傾斜によ
って吸収され、炉本体1の炉口と入側ダクト部52との
間の気密性を破ることなく、炉内で発生した排ガス及び
排熱を効率良く出側ダクト部55に導くことができる。Therefore, even if the straight-line distance between the downstream end of the inlet duct part 52 and the inlet end of the fixed outlet duct part 55 changes, the displacement view will change depending on the inclination of each intermediate duct part 53,54. The exhaust gas and exhaust heat generated in the furnace can be efficiently guided to the outlet duct 55 without breaking the airtightness between the furnace mouth of the furnace body 1 and the inlet duct 52.
以上に説明したように、本発明においては、排ガスダク
トの途中に複数の可動節を設けることによって、出湯時
に溶融還元炉の炉体を傾動させた場合であっても、排ガ
ス通路の気密性を維持することができる。そのため、炉
内から排出される排ガスに外気が侵入することがなく、
また排ガス及び排熱が外気に逸散することもなくなる。As explained above, in the present invention, by providing a plurality of movable joints in the middle of the exhaust gas duct, the airtightness of the exhaust gas passage can be maintained even when the furnace body of the smelting reduction furnace is tilted during tapping. can be maintained. Therefore, outside air does not enter into the exhaust gas discharged from the furnace.
Furthermore, exhaust gas and exhaust heat are no longer dissipated into the outside air.
したがって、排ガス及び排熱を予備還元炉、予熱炉、排
熱ボイラー等の後工程で使用するとき、排ガスの成分変
動や温度変動が少なくなるため、それら装置の操業状態
が安定化される。Therefore, when exhaust gas and exhaust heat are used in post-processes such as a pre-reducing furnace, a preheating furnace, and an exhaust heat boiler, fluctuations in the composition and temperature of the exhaust gas are reduced, and the operating conditions of these devices are stabilized.
また、このように外気から遮断された状態で排ガス及び
排熱を系外に導(ことができるため、炉内を高圧に維持
した操業も容易なものとなる。その結果、スラグのフォ
ーミングやスピッティングを抑えた操業も可能となる。In addition, since the exhaust gas and exhaust heat can be led out of the system while being isolated from the outside air, it becomes easier to operate the furnace while maintaining high pressure.As a result, slag forming and spitting can be performed easily. This also makes it possible to operate with less heating.
しかも、排ガスが圧縮された容積の小さな状態で送られ
るため、排ガス処理系の負荷も改善される。Moreover, since the exhaust gas is compressed and sent in a small volume state, the load on the exhaust gas treatment system is also improved.
第1図は本発明の第1実施例において使用した排ガスダ
クトを備えた溶融還元炉を示す概略図であり、第2図は
その溶融還元炉を傾動させた状態を示し、第3図及び第
4図は第2実施例を説明する図であり、第5図及び第6
図は第3実施例を説明する図である。
1:炉本体 2:溶融金属浴3ニスラグ層
4.60:出湯口5:出滓口
6:類ロ
ア:排ガスダクト 7a、52:入側ダクト部7
b、 53.54:中間ダクト部 7c、55:出側ダ
クト部8:入側部 9:加圧機構10.1
1:球面継手 12:サイクロン13:バグフィ
ルタ 14ニブロア15:煙突
21:水冷仕切り管22:ベローズ 23.
24.25:関節51:回転機構 56〜5
8:回転継手59:フランジ 60:出湯口
特許出願人 新日本製鐵 株式會社代 理 人
小 堀 益(ほか2名)第3図
第4図FIG. 1 is a schematic diagram showing a smelting reduction furnace equipped with an exhaust gas duct used in the first embodiment of the present invention, FIG. 2 shows the smelting reduction furnace in a tilted state, and FIGS. Figure 4 is a diagram explaining the second embodiment, and Figures 5 and 6 are diagrams for explaining the second embodiment.
The figure is a diagram explaining the third embodiment. 1: Furnace body 2: Molten metal bath 3 Varnish slag layer 4.60: Tap tap 5: Slag tap
6: Lower type: Exhaust gas duct 7a, 52: Inlet duct part 7
b, 53.54: Intermediate duct part 7c, 55: Outlet duct part 8: Inlet side part 9: Pressure mechanism 10.1
1: Spherical joint 12: Cyclone 13: Bag filter 14 Ni blower 15: Chimney
21: Water-cooled partition pipe 22: Bellows 23.
24.25: Joint 51: Rotation mechanism 56-5
8: Rotating joint 59: Flange 60: Patent applicant for the sprue: Nippon Steel Co., Ltd. Managing Director
Masu Kobori (and 2 others) Figure 3 Figure 4
Claims (1)
入側部と、ダクトの途中に設けられた少なくとも2以上
の可動節とを備えていることを特徴とする溶融還元炉用
排ガスダクト。 2、特許請求の範囲第1項記載の入側部及び可動節の少
なくとも一つが、球面継手構造であることを特徴とする
溶融還元炉用排ガスダクト。 3、特許請求の範囲第1項記載の入側部及び可動節の少
なくとも一つが、ベローズを備えた伸縮管であることを
特徴とする溶融還元炉用排ガスダクト。 4、特許請求の範囲第1項記載の入側部及び可動節の少
なくとも一つが、回転継手であることを特徴とする溶融
還元炉用排ガスダクト。 5、溶融還元炉の炉口に入側ダクト部を固定し、該入側
ダクト部を単数又は複数の中間ダクト部を介して出側ダ
クト部に接続し、それぞれのダクト部の間に可動節を設
けたことを特徴とする溶融還元炉用排ガスダクト。[Claims] 1. The duct is characterized by comprising: an inlet portion airtightly and rotatably connected to the mouth of the smelting reduction furnace; and at least two movable joints provided in the middle of the duct. Exhaust gas duct for smelting reduction furnace. 2. An exhaust gas duct for a smelting-reduction furnace, wherein at least one of the entry side portion and the movable joint according to claim 1 has a spherical joint structure. 3. An exhaust gas duct for a smelting-reduction furnace, wherein at least one of the entry side portion and the movable joint as set forth in claim 1 is a telescopic tube provided with a bellows. 4. An exhaust gas duct for a smelting-reduction furnace, characterized in that at least one of the entry side portion and the movable joint as set forth in claim 1 is a rotary joint. 5. Fix the inlet duct part at the furnace entrance of the melting reduction furnace, connect the inlet duct part to the outlet duct part via one or more intermediate duct parts, and install a movable joint between each duct part. An exhaust gas duct for a smelting reduction furnace, characterized by being provided with.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2085888A JPH01196492A (en) | 1988-01-30 | 1988-01-30 | Exhaust gas duct for melt-reducing furnace |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2085888A JPH01196492A (en) | 1988-01-30 | 1988-01-30 | Exhaust gas duct for melt-reducing furnace |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH01196492A true JPH01196492A (en) | 1989-08-08 |
Family
ID=12038816
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2085888A Pending JPH01196492A (en) | 1988-01-30 | 1988-01-30 | Exhaust gas duct for melt-reducing furnace |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH01196492A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001004279A (en) * | 1999-06-08 | 2001-01-12 | Technological Resources Pty Ltd | Direct refining container |
-
1988
- 1988-01-30 JP JP2085888A patent/JPH01196492A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001004279A (en) * | 1999-06-08 | 2001-01-12 | Technological Resources Pty Ltd | Direct refining container |
JP4638576B2 (en) * | 1999-06-08 | 2011-02-23 | テクノロジカル リソーシズ プロプライエタリー リミテッド | Direct scouring container |
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