JPH11151428A - Exhaust gas treatment for electric furnace - Google Patents
Exhaust gas treatment for electric furnaceInfo
- Publication number
- JPH11151428A JPH11151428A JP33513197A JP33513197A JPH11151428A JP H11151428 A JPH11151428 A JP H11151428A JP 33513197 A JP33513197 A JP 33513197A JP 33513197 A JP33513197 A JP 33513197A JP H11151428 A JPH11151428 A JP H11151428A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- electric furnace
- exhaust
- activated carbon
- building
- 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
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、主として、製鋼工
場，廃棄物溶融施設等におけるアーク炉等の電気炉から
排出される排ガスからダイオキシン等の有害物質を除去
する電気炉の排ガス処理方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric furnace exhaust gas treatment method for removing harmful substances such as dioxin from exhaust gas discharged from an electric furnace such as an arc furnace in a steelmaking plant, a waste melting facility, and the like. It is.
【０００２】[0002]
【従来の技術】例えばアーク炉が設置された製鋼工場に
おいては、溶解期に発生した排ガスを炉体内から直接吸
引してバグハウスに導きダストを捕集する直引系排気路
と、スクラップ装入時や出鋼時等に該アーク炉から建家
内に放出された排ガスを該アーク炉上に設けられた天井
フードから吸引してバグハウスに導く建家系排気路が従
来から設けられている。そして炉体内から直接吸引した
直引系排気路の排ガスは高温度であるので、冷却塔に通
して冷却した後にバグハウスに通し、ダストを捕集する
ようにしている。2. Description of the Related Art For example, in a steelmaking plant equipped with an arc furnace, exhaust gas generated during the melting period is sucked directly from the furnace and guided to a baghouse to collect dust, and a scraping charging system is provided. 2. Description of the Related Art Conventionally, a building-related exhaust passage has been provided in which exhaust gas discharged from the arc furnace into the house at the time of tapping or tapping is sucked from a ceiling hood provided on the arc furnace and led to a baghouse. Since the exhaust gas in the direct-drawing system exhaust path directly sucked from the furnace body has a high temperature, the exhaust gas is cooled through a cooling tower and then passed through a baghouse to collect dust.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら従来の上
記排ガス処理装置では、直引系排気路を流れる排ガスの
温度が高いために、有害物質で極めて毒性の強いダイオ
キシンをバグハウスにて効率的に捕集できない問題があ
った。ちなみに、図５はダイオキシン（ポリ塩化ジベン
ゾパラジオキシン，ポリ塩化ジベンゾフラン等の異性体
の総称）の融点および沸点を示した状態図であるが、同
図から、一般にダイオキシンは、高温度では気体状で、
温度が下がるに従い液体化し、さらに温度を下げること
により固化することが判る。このため排ガス温度が高い
とバグハウスを通過させてもダイオキシンが捕集されな
いまま大気中に放出される割合が高い状況であった。However, in the above-mentioned conventional exhaust gas treatment apparatus, since the temperature of the exhaust gas flowing through the exhaust line of the direct drawing system is high, dioxins which are toxic and extremely toxic are efficiently trapped in the bag house. There was a problem that could not be gathered. Incidentally, FIG. 5 is a phase diagram showing the melting point and boiling point of dioxin (generic name of isomers such as polychlorinated dibenzoparadioxin and polychlorinated dibenzofuran). As shown in FIG. 5, dioxin is generally gaseous at high temperatures. ,
It can be seen that the liquid becomes liquid as the temperature decreases, and solidifies when the temperature is further lowered. For this reason, when the temperature of the exhaust gas was high, the rate of release of dioxin into the atmosphere without being collected was high even when the exhaust gas passed through the baghouse.
【０００４】また、排ガス中に活性炭を吹き込んでダイ
オキシンを該活性炭に吸着させることも従来から知られ
ているが、単に活性炭を吹き込むだけではランニングコ
ストが高くつくわりに従来方法ではダイオキシンを充分
に効率よく捕集できなかった。It has also been known that activated carbon is blown into exhaust gas to adsorb dioxin onto the activated carbon. However, simply injecting activated carbon requires a high running cost, and the conventional method can sufficiently reduce dioxin efficiency. Could not be collected.
【０００５】[0005]
【課題を解決するための手段】本発明は上記課題を解決
し、電気炉の排ガス中のダイオキシンを効果的に捕集で
きる排ガス処理方法を提供しようとするもので、電気炉
から排ガスを直接吸引する直引系排気路と、電気炉の建
家の天井フードから排ガスを間接的に吸引する建家系排
気路とからなる電気炉の排ガス処理装置において、直引
系排気路に微粉状の活性炭を吹き込んで該活性炭を混合
塔内で排ガスと混合させた後に該排ガスを建家系排気路
に導いて該建家系排気路の排ガスと混合させ、該建家系
排気路に設けられたバグハウスにて該活性炭を捕集する
ようにしたことを特徴とする。DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an exhaust gas treatment method capable of effectively collecting dioxin in exhaust gas from an electric furnace. In an exhaust gas treatment device for an electric furnace, which includes a direct exhaust line for exhausting gas and a building exhaust line for indirectly sucking exhaust gas from a ceiling hood of an electric furnace house, fine activated carbon is supplied to the direct exhaust line. After blowing and mixing the activated carbon with the exhaust gas in the mixing tower, the exhaust gas is guided to a building exhaust path and mixed with the exhaust gas of the building exhaust path. It is characterized by collecting activated carbon.
【０００６】また本発明は上記電気炉の排ガス処理方法
において、操業開始前に建家系排気路のバグハウスの上
流から微粉状の活性炭を吹き込むことによって該バグハ
ウスのフィルタの表面に予め活性炭による濾過層を形成
させることを特徴とする。The present invention also relates to the above-described method for treating exhaust gas from an electric furnace, wherein fine activated carbon is blown from the upstream side of the baghouse in the exhaust line of the house before starting the operation, so that the surface of the filter of the baghouse is filtered with activated carbon in advance. The method is characterized in that a layer is formed.
【０００７】[0007]
【発明の実施の形態】次に図１に従い本発明の実施の形
態を鉄スクラップを溶解させるアーク式の電気炉につい
て説明する。図中、１は炉体中に電極３を垂下させたア
ーク式の電気炉である。またＡは該電気炉１の排ガス出
口２から排ガスを直接吸引する直引系排気路、Ｂは該電
気炉１の上方の建家の天井に設けられた天井フード４か
ら排ガスを間接的に吸引する建家系排気路である。排ガ
ス出口２には開閉自在な外気取入口５が設けられている
とともに、上流から順に燃焼塔６，冷却塔７，直引系バ
グハウス８，混合塔９，ブースタ送風機１０が設けら
れ、また、建家系排気路Ｂの下流には送風機１２および
バグハウス１３が設けられている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIG. 1 with respect to an arc type electric furnace for melting iron scrap. In the figure, reference numeral 1 denotes an arc type electric furnace in which an electrode 3 is suspended in a furnace body. A is a direct drawing system exhaust path for directly sucking exhaust gas from an exhaust gas outlet 2 of the electric furnace 1, and B is indirectly sucking exhaust gas from a ceiling hood 4 provided on a ceiling of a building above the electric furnace 1. It is a building-related exhaust passage. The exhaust gas outlet 2 is provided with an openable and closable outside air intake 5 and, in order from the upstream, a combustion tower 6, a cooling tower 7, a direct draw system baghouse 8, a mixing tower 9, and a booster blower 10. A blower 12 and a bag house 13 are provided downstream of the building-related exhaust passage B.
【０００８】燃焼塔６は電気炉１から排出された排ガス
が下向に流される間にバーナ１１の火炎を当て排ガス中
のＣＯ等の未燃成分を燃焼分解させる。また、冷却塔７
は冷却水を通水するラジエータが内蔵され、排ガスの温
度をバグ状のフィルタの耐熱温度である２５０℃以下に
冷却する。直引系バグハウス８は、複数のバグ状のフィ
ルタ１４内に排ガス中のダストを捕集するものである。The combustion tower 6 irradiates the flame of the burner 11 while the exhaust gas discharged from the electric furnace 1 flows downward to burn and decompose unburned components such as CO in the exhaust gas. Also, the cooling tower 7
Has a built-in radiator through which cooling water flows, and cools the temperature of exhaust gas to 250 ° C. or less, which is the heat-resistant temperature of the bag-shaped filter. The direct pulling baghouse 8 collects dust in exhaust gas in a plurality of bag-shaped filters 14.
【０００９】混合塔９は、垂設された円筒形の塔本体１
５の内部に螺旋状の案内羽根１６を配置すると共に、上
部外周に図２に示したようにその接線方向にダクト１７
が連なるように流入口１８を形成してなる。また、２
０，２１は該塔本体１５の外周に設けた活性炭吹込口
で、該吹込口２０，２１は前記流入口１８と同じく接線
方向に設けられる。２２は該塔本体１５の下部に形成さ
れた流出口、２３は該塔本体１５内にて沈降したダスト
を排出するために設けられた排出口である。[0009] The mixing tower 9 comprises a vertically suspended cylindrical tower body 1.
5, a spiral guide vane 16 is arranged inside, and a duct 17 is tangentially arranged on the upper outer periphery as shown in FIG.
Are formed so as to be continuous. Also, 2
Reference numerals 0 and 21 denote activated carbon injection ports provided on the outer periphery of the tower body 15, and the injection ports 20 and 21 are provided in the tangential direction similarly to the inlet 18. Reference numeral 22 denotes an outlet formed at a lower portion of the tower body 15, and reference numeral 23 denotes an outlet provided for discharging dust settled in the tower body 15.
【００１０】また、２４は図３に示したようにダクト１
７の外周の接線方向に連なるように設けられた活性炭吹
込口で、該吹込口２４および前記吹込口２０，２１に粉
状の活性炭が貯留されたホッパ２５と送風機２６からな
る活性炭投入装置２７が夫々設けられる。そして該ホッ
パ２５中の活性炭が該送風機２６によって該各吹込口に
圧送され、該各吹込口から該活性炭がダクト１７および
塔本体１５内に吹込まれる。なおその活性炭の添加量
は、例えば排ガス１Ｎｍ3 当り１００〜５００ｍｇとな
るようにする。Further, reference numeral 24 denotes a duct 1 as shown in FIG.
Activated carbon injection device 27 composed of a blower 26 and a hopper 25 in which powdered activated carbon is stored in the blowing port 24 and the blowing ports 20 and 21 is an activated carbon blowing port provided so as to be connected in a tangential direction on the outer periphery of 7. Each is provided. Then, the activated carbon in the hopper 25 is pressure-fed to each of the blowing ports by the blower 26, and the activated carbon is blown into the duct 17 and the tower body 15 from each of the blowing ports. The addition amount of the activated carbon is, for example, 100 to 500 mg per 1 Nm 3 of exhaust gas.
【００１１】吹込口２４より吹き込まれた活性炭はその
吹込時の勢いにより図３に示したようにダクト１７中に
て排ガスと共に旋回する。また吹込口２０，２１より吹
き込まれた活性炭はその吹込時の勢いにより混合塔９内
にて案内羽根１６に沿い排ガスと共に旋回しつつ下降す
る。このため排ガスとの接触効率がよく、排ガス中のダ
イオキシン，重金属等の有害物質を効率よく吸着する。The activated carbon blown from the blowing port 24 is swirled together with the exhaust gas in the duct 17 as shown in FIG. The activated carbon blown from the blowing ports 20 and 21 descends while swirling with the exhaust gas along the guide vanes 16 in the mixing tower 9 due to the momentum at the time of the blowing. Therefore, the contact efficiency with the exhaust gas is good, and harmful substances such as dioxins and heavy metals in the exhaust gas are efficiently adsorbed.
【００１２】混合塔９の下流はブースタ送風機１０に接
続され、該送風機の下流には流路切換用ダンパ３０を設
け、該ダンパの下流側を一方は建家系排気路Ｂの送風機
１２の上流側に接続し、排ガスを該建家系排気路Ｂの排
ガスと合流させると伴に、他方は煙突（図示せず）に連
なる排気ダクト３５に接続している。A downstream side of the mixing tower 9 is connected to a booster blower 10, and a flow path switching damper 30 is provided downstream of the blower, and one side of the downstream side of the damper is located upstream of the blower 12 of the building system exhaust path B. And the other is connected to an exhaust duct 35 connected to a chimney (not shown).
【００１３】バグハウス１３は、濾布を袋状に縫製して
なるバグ状のフィルタ３６を内部に複数本吊下してなる
もので、そのフィルタの目を排ガスが透過することで排
ガス中のダストがその内面に捕集され、該バグハウス１
３の上部から清浄化された排ガスを大気中に排出させ
る。また、バグ状のフィルタ３６の内面に捕集されたダ
ストは瀘過層を形成し、ダイオキシンを吸着して低減す
ることができる。The bag house 13 has a plurality of bag-shaped filters 36 each formed by sewing a filter cloth in a bag shape. The bag-shaped filters 36 are suspended inside the bag. Dust is collected on the inside, and the baghouse 1
The exhaust gas thus cleaned is discharged into the atmosphere from the upper part of 3. The dust collected on the inner surface of the bag-like filter 36 forms a filtration layer, and adsorbs and reduces dioxin.
【００１４】このため、電気炉１から吸引された８００
〜１２００℃の排ガスは、燃焼塔６を通ってＣＯ等の可
燃物が燃焼され、冷却塔７を通過することにより２５０
℃以下に冷却された後、直引系バグハウス８にてダイオ
キシン，重金属等を含む細かなダストが捕集される。ち
なみに該バグハウス８の下流側の排ガスの温度は１５０
℃以下となる。For this reason, the 800 sucked from the electric furnace 1
The flue gas at ~ 1200 ° C is combusted by combustibles such as CO through the combustion tower 6 and passes through the cooling tower 7 to produce
After the temperature is cooled to not more than 0 ° C., fine dust containing dioxin, heavy metal, and the like is collected in the direct draw baghouse 8. By the way, the temperature of the exhaust gas downstream of the baghouse 8 is 150
° C or lower.
【００１５】そして、活性炭投入装置２７より吹き込ま
れた活性炭にダイオキシンおよび重金属等の有害物質が
吸着され、該活性炭は排ガスとともに送風機１０に吸引
されて建家系排気路Ｂに流され該建家系排気路Ｂの排ガ
スと合流しバグハウス１３により捕集される。このよう
に直引系排気路Ａの排ガスと建家系排気路Ｂの排ガスと
を合流させることにより、該排ガスの温度は大幅に低下
し温度が６０℃程度まで下がるので、ダイオキシン等の
有害物質の固体化が進みこれをバグハウス１３にて確実
に捕集することができる。Then, harmful substances such as dioxin and heavy metals are adsorbed by the activated carbon blown from the activated carbon charging device 27, and the activated carbon is sucked together with the exhaust gas by the blower 10 and is flown to the building-related exhaust passage B to be flown to the building-related exhaust passage. It merges with the exhaust gas of B and is collected by the bag house 13. By combining the exhaust gas from the direct exhaust line A and the exhaust gas from the building exhaust line B in this manner, the temperature of the exhaust gas is greatly reduced and the temperature is reduced to about 60 ° C., so that harmful substances such as dioxin are reduced. As the solidification proceeds, this can be reliably collected in the bag house 13.
【００１６】なお、バグハウス８の下流側で活性炭を添
加したことではバグハウス８の上流側で添加するのに比
べて活性炭の添加量は少なくて済みランニングコストが
軽減される利点がある。またバグハウス８の下流側で添
加することで、排ガスの温度も充分に下がることと、バ
グハウス８で火種が該バグハウスによりトラップされる
ために粉じん爆発，火災等のリスクが少なくなる利点も
ある。The addition of activated carbon on the downstream side of the baghouse 8 has the advantage that the amount of activated carbon added is small and the running cost is reduced as compared with the addition on the upstream side of the baghouse 8. Further, by adding the gas at the downstream side of the baghouse 8, the temperature of the exhaust gas can be sufficiently lowered, and since the fire is trapped by the baghouse in the baghouse 8, the risk of dust explosion, fire and the like can be reduced. is there.
【００１７】なお、電気炉１を操業開始する前に活性炭
投入装置２７より活性炭を吹き込んで建家系排気路Ｂの
バグハウス１３のフィルタ３６の表面に図４に示したよ
うに予め活性炭による濾過層３７を形成させておくこと
によって、該濾過層３７に建家系排気路Ｂより流入して
来る排ガス中のダイオキシンを効率よく吸着させること
ができるので全体としてのダイオキシン捕集効率が一層
向上するとともにランニングコストを軽減するのに寄与
できる。Before starting the operation of the electric furnace 1, activated carbon is blown from the activated carbon charging device 27 to the filter 36 of the baghouse 13 in the exhaust line B of the building system, as shown in FIG. By forming 37, the dioxin in the exhaust gas flowing into the filter layer 37 from the exhaust passage B from the building system can be efficiently adsorbed, so that the overall dioxin collection efficiency can be further improved and running can be performed. This can contribute to reducing costs.
【００１８】[0018]
【発明の効果】このように本発明に係る電気炉の排ガス
処理方法では、直引系排気路に微粉状の活性炭を吹き込
んで該活性炭を混合塔内で排ガスと混合させた後に該排
ガスを建家系排気路に導いて該建家系排気路の排ガスと
混合させることによって、排ガス温度を大幅に下げてか
ら、バグハウスにて該活性炭を捕集するものであるの
で、ダイオキシンが固化しその捕集効率を大幅に向上さ
せることができ、しかも著しくコストを上昇させること
がないなど有益な効果がある。As described above, in the exhaust gas treatment method for an electric furnace according to the present invention, activated carbon in the form of fine powder is blown into a direct-drawing exhaust path, and the activated carbon is mixed with the exhaust gas in a mixing tower. Since the temperature of the exhaust gas is significantly reduced by leading to the exhaust line of the family system and mixing with the exhaust gas of the exhaust line of the house system, the activated carbon is collected in the baghouse, so that dioxin solidifies and is collected. Efficiency can be greatly improved, and there are other beneficial effects such as not significantly increasing costs.
【図１】本発明に係る電気炉の排ガス処理方法の実施形
態を示した排ガス系統図。FIG. 1 is an exhaust gas system diagram showing an embodiment of an electric furnace exhaust gas treatment method according to the present invention.
【図２】図１に示した混合塔の横断面図。FIG. 2 is a cross-sectional view of the mixing tower shown in FIG.
【図３】図１に示したダクトの横断面図。FIG. 3 is a cross-sectional view of the duct shown in FIG.
【図４】バグフィルタの部分拡大断面図。FIG. 4 is a partially enlarged sectional view of a bag filter.
【図５】ダイオキシンの状態図。FIG. 5 is a state diagram of dioxin.
Ａ 直引系排気路 Ｂ 建家系排気路 １ 電気炉 ２ 排ガス出口 ４ 天井フード ６ 燃焼塔 ７ 冷却塔 ８ 直引系バグハウス ９ 混合塔 １０ 送風機 １２ 送風機 １３ バグハウス ２０，２１，２４ 活性炭吹込口 ２７ 活性炭投入装置 ３６ フィルタ DESCRIPTION OF SYMBOLS A Direct-drawing exhaust path B Building-related exhaust path 1 Electric furnace 2 Exhaust gas outlet 4 Ceiling hood 6 Combustion tower 7 Cooling tower 8 Direct-drawing system baghouse 9 Mixing tower 10 Blower 12 Blower 13 Baghouse 20,21,24 Activated carbon inlet 27 Activated carbon input device 36 Filter
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｃ２２Ｂ 7/02 Ｂ０１Ｄ 53/34 Ｂ Ｆ２４Ｆ 7/06 ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 6 Identification code FI C22B 7/02 B01D 53/34 B F24F 7/06
Claims (2)
排気路と、電気炉の建家の天井フードから排ガスを間接
的に吸引する建家系排気路とからなる電気炉の排ガス処
理装置において、直引系排気路に微粉状の活性炭を吹き
込んで該活性炭を混合塔内で排ガスと混合させた後に該
排ガスを建家系排気路に導いて該建家系排気路の排ガス
と混合させ、該建家系排気路に設けられたバグハウスに
て該活性炭を捕集するようにしたことを特徴とする電気
炉の排ガス処理方法。1. An exhaust gas treatment apparatus for an electric furnace, comprising: a direct exhaust line for directly sucking exhaust gas from an electric furnace; and a building exhaust line for indirectly sucking exhaust gas from a ceiling hood of a house of the electric furnace. Activating the fine carbon powder into a direct drawing exhaust path, mixing the activated carbon with exhaust gas in a mixing tower, and then guiding the exhaust gas to a building exhaust path to mix with the exhaust gas from the building exhaust path. An exhaust gas treatment method for an electric furnace, wherein the activated carbon is collected in a bag house provided in a family exhaust passage.
の上流から微粉状の活性炭を吹き込むことによって該バ
グハウスのフィルタの表面に予め活性炭による濾過層を
形成させることを特徴とした請求項１に記載の電気炉の
排ガス処理方法。2. A filter layer of activated carbon is formed in advance on the surface of a filter of the baghouse by blowing fine powdered activated carbon from the upstream side of the baghouse in a building exhaust line before starting operation. 2. The method for treating exhaust gas from an electric furnace according to claim 1.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33513197A JP3307302B2 (en) | 1997-11-18 | 1997-11-18 | Exhaust gas treatment method for electric furnace |
| TW087112746A TW384236B (en) | 1997-08-20 | 1998-08-03 | Operation of electric melting furnace |
| KR1019980031851A KR100567705B1 (en) | 1997-08-20 | 1998-08-03 | Operation Method of Electric Melting Furnace |
| MYPI98003745A MY128795A (en) | 1997-08-20 | 1998-08-18 | Method of operating an electric melting furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33513197A JP3307302B2 (en) | 1997-11-18 | 1997-11-18 | Exhaust gas treatment method for electric furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11151428A true JPH11151428A (en) | 1999-06-08 |
| JP3307302B2 JP3307302B2 (en) | 2002-07-24 |
Family
ID=18285122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33513197A Expired - Lifetime JP3307302B2 (en) | 1997-08-20 | 1997-11-18 | Exhaust gas treatment method for electric furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3307302B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007144373A (en) * | 2005-11-30 | 2007-06-14 | Daido Steel Co Ltd | Treating method of exhaust gas |
-
1997
- 1997-11-18 JP JP33513197A patent/JP3307302B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007144373A (en) * | 2005-11-30 | 2007-06-14 | Daido Steel Co Ltd | Treating method of exhaust gas |
| JP4581983B2 (en) * | 2005-11-30 | 2010-11-17 | 大同特殊鋼株式会社 | Exhaust gas treatment method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3307302B2 (en) | 2002-07-24 |
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