JP2000005537A - Treatment of waste gas of arc furnace - Google Patents

Treatment of waste gas of arc furnace

Info

Publication number
JP2000005537A
JP2000005537A JP19249498A JP19249498A JP2000005537A JP 2000005537 A JP2000005537 A JP 2000005537A JP 19249498 A JP19249498 A JP 19249498A JP 19249498 A JP19249498 A JP 19249498A JP 2000005537 A JP2000005537 A JP 2000005537A
Authority
JP
Japan
Prior art keywords
exhaust gas
arc furnace
exhaust
exhaust line
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.)
Pending
Application number
JP19249498A
Other languages
Japanese (ja)
Inventor
Yukio Niwa
幸雄 丹羽
Shoji Kitabayashi
庄治 北林
Kazunori Onaka
一徳 大中
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daido Steel Co Ltd
Original Assignee
Daido Steel Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Daido Steel Co Ltd filed Critical Daido Steel Co Ltd
Priority to JP19249498A priority Critical patent/JP2000005537A/en
Publication of JP2000005537A publication Critical patent/JP2000005537A/en
Pending legal-status Critical Current

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

Landscapes

  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

PROBLEM TO BE SOLVED: To efficiently remove such harmful matter as dioxins contained in the waste gas of an arc furnace and to suppress its discharge to the outside. SOLUTION: This waste gas treating device consists of the direct-suction exhaust line A for directly sucking the waste gas from an arc furnace 1 and a building exhaust line B for indirectly sucking the waste gas from the ceiling hood 4 of the building of the arc furnace 1. The dust 35 contg. >=50% fine powder having <=1 μm grain diameter is blown in from the upstream side of a bag house 13 furnished to the building exhaust line before the operation is started to form the primary filter bed 36 of dust on the surface of a filter in the bag house, activated carbon 24 is blown into the direct-suction exhaust line during the operation, the waste gas in the direct-suction exhaust line is introduced into the building exhaust line and mixed with the waste gas of the building exhaust line, and the activated carbon is collected in the bag house.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【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 exhaust gas treatment method for removing harmful substances such as dioxin from exhaust gas discharged from an arc furnace in a steelmaking plant, a waste melting facility, and the like.

【０００２】[0002]

【従来の技術】例えば製鋼工場に設置されたアーク炉で
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 an arc furnace installed in a steelmaking factory, exhaust gas generated during the melting period is directly sucked from the furnace and guided to a baghouse to collect dust. 2. Description of the Related Art Conventionally, there has been provided a building-related exhaust passage that draws exhaust gas discharged from the arc furnace into a house during tapping or the like from a ceiling hood provided on the arc furnace and guides the exhaust gas 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). ,
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はダイオキシンを充分に効率よく
捕集できなかった。[0004] It has been conventionally known that activated carbon is blown into exhaust gas to adsorb dioxin onto the activated carbon. However, simply injecting activated carbon increases the running cost and collects dioxin sufficiently efficiently. could not.

【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、アーク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、アー
ク炉から排ガスを直接吸引する直引系排気路と、アーク
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排ガス処理装置において、操業開
始前に建家系排気路に設けられたバグハウスの上流から
粒径１ミクロン以下の微粉体を５０％以上含んだダスト
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
に予め該ダストによる一次濾過層を形成させておき、操
業中に直引系排気路に活性炭を吹き込み該直引系排気路
の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。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has an object to provide an exhaust gas treatment method capable of effectively collecting dioxin in exhaust gas from an arc furnace. An exhaust gas treatment system consisting of a direct exhaust system that draws air and an exhaust system that indirectly sucks exhaust gas from the ceiling hood of the arc furnace building. A dust containing 50% or more of fine powder having a particle size of 1 micron or less is blown from the upstream of the baghouse to form a primary filtration layer of the dust on the surface of the filter of the baghouse in advance, and the direct exhaust system is operated during operation. Activated carbon is blown into the exhaust passage, and the exhaust gas from the direct exhaust passage is guided to the house exhaust passage to be mixed with the exhaust gas from the house exhaust passage, so that the activated carbon is collected in the baghouse. To.

【０００６】また本発明は上記アーク炉の排ガス処理方
法において、アーク炉の操業中に建家系排気路に吸引さ
れた排ガスから捕集したダストを操業開始前にバグハウ
スの上流に吹き込むことを特徴とする。さらに本発明は
上記アーク炉の排ガス処理方法において、建家系排気路
のバグハウスのフィルタは微粉体が被着し易い毛羽立っ
た繊維材からなるものであることを特徴とする。Further, the present invention is characterized in that, in the above-mentioned method for treating exhaust gas from an arc furnace, dust collected from exhaust gas sucked into an exhaust line of a house during the operation of the arc furnace is blown upstream of the bag house before starting the operation. And Further, the present invention is characterized in that, in the above-described method for treating exhaust gas from an arc furnace, the filter of the baghouse in the exhaust line of the house is made of a fluffy fiber material on which fine powder is easily adhered.

【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炉で
ある。またＡは該アーク炉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は該アーク炉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。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIG. In the figure, reference numeral 1 denotes an arc furnace in which an electrode 3 is suspended in a furnace body. A is a direct exhaust line for directly sucking exhaust gas from an exhaust gas outlet 2 of the arc furnace 1, and B is indirectly sucking exhaust gas from a ceiling hood 4 provided on a ceiling of a building above the arc furnace 1. It is a building-related exhaust passage. The exhaust gas outlet 2 is provided with an openable and closable external air intake 5, and the combustion tower 6, the cooling tower 7, the direct draw baghouse 8,
A mixing tower 9 and a booster blower 10 are provided, and a blower 12 and a bag house 13
Is provided.

【０００８】燃焼塔６はアーク炉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 arc furnace 1 flows downward, and burns and decomposes unburned components such as CO in the exhaust gas. The cooling tower 7 has a built-in radiator through which cooling water flows, and cools the temperature of the exhaust gas to 250 ° C. or lower, 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は円筒形の塔本体１５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、２０は該塔本体１
５の外周に設けた活性炭吹込口で、該吹込口２０は前記
流入口１８と同じく接線方向に設けられる。該吹込口２
０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中に装填された粉状の活性炭２４が該送風
機２６によって該吹込口２０に圧送され、該吹込口から
該活性２４炭が塔本体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１００〜５
００ｍｇとなるようにする。なお、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。The mixing tower 9 has a spiral guide blade 16 arranged inside a cylindrical tower body 15 and an upper outer periphery as shown in FIG.
The inlet 18 is formed so that the duct 17 continues in the tangential direction as shown in FIG. 20 is the tower body 1
5 is an activated carbon inlet provided on the outer periphery of the inlet 5, and the inlet 20 is provided in the tangential direction similarly to the inlet 18. The blow port 2
Hopper 25 and powder blower 26 in which powdered activated carbon is stored.
Activated carbon charging devices 27 are provided. Then, the powdered activated carbon 24 loaded in the hopper 25 is pressure-fed to the blowing port 20 by the blower 26, and the activated 24 carbon is blown into the tower main body 15 from the blowing port. The addition amount of the activated carbon is, for example, 100 to 5 per 1 Nm3 of exhaust gas.
So as to be 00 mg. 22 is the tower body 15
An outlet 23 formed in the lower part of the column is an outlet provided for discharging dust settled in the tower body 15.

【００１０】吹込口２０より吹き込まれた活性炭２４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 24 blown from the inlet 20 descends while swirling with the exhaust gas along the guide blades 16 in the mixing tower 9 by the force 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.

【００１１】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２８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２９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 28 is provided downstream of the blower, and one side of the downstream side of the damper is located on the upstream side of the blower 12 in the building system exhaust path B. And the other end is connected to an exhaust duct 29 connected to a chimney (not shown) while the exhaust gas is merged with the exhaust gas in the building system exhaust passage B.

【００１２】バグハウス１３は、テトロン，ナイロン，
ガラス繊維等の繊維材からなる織物または不織布を袋状
に縫製してなるバグ形のフィルタ３０を内部に複数本吊
下してなる。Baghouse 13 is made of Tetron, nylon,
A plurality of bag-shaped filters 30 each formed by sewing a woven or non-woven fabric made of a fiber material such as glass fiber into a bag shape are suspended inside.

【００１３】また、３１は建家系排気路Ｂを通る排ガス
から微細なダストを捕集するために設けられた建家系ダ
スト捕集装置で、該装置は建家系排気路Ｂの分岐通路３
２に送風機３３，バグハウス３４を設けてなり、操業中
に該建家系排気路Ｂに吸引された排ガスには、ＣａＯ，
ＦｅＯ，Ｆｅ2Ｏ3，Ａｌ2Ｏ3，ＺｎＯ，ＭｇＯ等の金属
酸化物からなる粒径１ミクロン以下の微粉体が含まれそ
のダスト３５を該バグハウス３４中に捕集できる。Reference numeral 31 denotes a building-based dust collecting device provided for collecting fine dust from exhaust gas passing through the building-related exhaust passage B. The device is a branch passage 3 of the building-related exhaust passage B.
2 is provided with a blower 33 and a bag house 34. The exhaust gas sucked into the building system exhaust passage B during operation includes CaO,
Fine powder of a metal oxide such as FeO, Fe 2 O 3 , Al 2 O 3 , ZnO, MgO and the like having a particle diameter of 1 μm or less is included, and the dust 35 can be collected in the bag house 34.

【００１４】そこで、前記バグハウス１３のフィルタ３
０を新しいものに交換した場合には、該アーク炉の操業
を開始する前に該ダスト３５を前記ホッパ２５に入れて
吹込口２０より塔本体１５内に吹込み、該ダスト３５を
送風機１０，１２を作動させ該塔本体１５中のガスを吸
引することにより該ダスト３５を該フィルタ３０の表面
に付着させ、図３に示したように、該ダスト３５による
均等な厚さの一次濾過層３６を予め形成させておく。The filter 3 of the bag house 13
In the case where 0 is replaced with a new one, before the operation of the arc furnace is started, the dust 35 is put into the hopper 25 and blown into the tower body 15 from the blowing port 20, and the dust 35 is blown by the blower 10, The dust 35 is adhered to the surface of the filter 30 by activating the gas filter 12 and sucking the gas in the tower body 15, and as shown in FIG. Is formed in advance.

【００１５】アーク炉１の操業中には、８００〜１２０
０℃の排ガスが該アーク炉から排出され、該排ガスは燃
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。During the operation of the arc furnace 1, 800 to 120
Exhaust gas at 0 ° C. is discharged from the arc furnace, and the exhaust gas passes through a combustion tower 6 to burn combustibles such as CO, and is cooled to 250 ° C. or less by passing through a cooling tower 7. Dust containing dioxins, heavy metals and the like is collected in the bag house 8. Incidentally, the temperature of the exhaust gas on the downstream side of the bag house 8 is 150 ° C. or less.

【００１６】そして、活性炭投入装置２７より粒径２０
〜２５ミクロン程度の粉状の活性炭２４が吹き込まれ、
該活性炭は混合塔９内にて排ガスと共に旋回した後、送
風機１０によって撹拌され、その際発生する乱流により
排ガスと効率よく接触し、排ガス中のダイオキシン，重
金属等の有害物質が該活性炭の細孔中に吸着される。そ
して該活性炭２４は排ガスととも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に入る。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にて効率よく捕集できる。Then, a particle size of 20
Powdered activated carbon 24 of about 25 microns is blown,
The activated carbon is swirled together with the exhaust gas in the mixing tower 9 and then stirred by the blower 10, and efficiently contacts the exhaust gas due to the turbulent flow generated at that time. Adsorbed in pores. Then, the activated carbon 24 is sucked together with the exhaust gas, flows into the exhaust line B of the building system, merges with the exhaust gas of the exhaust line B of the building system, and enters the bag house 13. As described above, by combining the exhaust gas from the direct exhaust line A and the exhaust gas from the building exhaust line B, 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 As the solidification proceeds, this can be efficiently collected in the bag house 13.

【００１７】なお、バグハウス８の下流側で活性炭２４
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 activated carbon 24 is located downstream of the baghouse 8.
Is advantageous in that the amount of activated carbon to be added is small and the running cost is reduced as compared with the case of adding at the upstream side of the bag house 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.

【００１８】また、アーク炉１を操業開始する前にダス
ト３５を吹き込んで、フィルタ３０の表面に一次濾過層
３６を形成することにより、図４に示したように、該一
次濾過層３６上に活性炭２４が捕集され、該活性炭によ
り建家系排気路Ｂより流入して来る排ガス中のダイオキ
シンも吸着される。Further, before the operation of the arc furnace 1 is started, dust 35 is blown to form a primary filtration layer 36 on the surface of the filter 30, so that the primary filtration layer 36 is formed on the primary filtration layer 36 as shown in FIG. Activated carbon 24 is collected, and the activated carbon also adsorbs dioxin in the exhaust gas flowing in from the building exhaust line B.

【００１９】なお、一次濾過層３６を構成するダスト３
５は、その５０％以上が粒径１ミクロン以下の微粉体か
らなるものとすることにより、フィルタ３０を構成する
繊維材の表面に粘着する。このため定期的に該フィルタ
３０を清掃のために振動させて活性炭２４を振るい落と
した場合でも該一次濾過層３６は該繊維材から剥離する
ことなく常に濾過面が緻密に保たれ濾過性能を維持する
ことができるので、ダイオキシン捕集効率が一層向上す
る。ここで、一次濾過層３６の剥離を防ぎフィルタ３０
に対する微粉体の粘着性を保つためには、該フィルタは
微粉体が被着し易い毛羽立った形態の繊維材からなるも
のであることが望ましく、また該微粉体の割合も１ミク
ロン以下のものが５０％以上含まれていることが必要で
ある。そのために建家系排気路Ｂから捕集されたダスト
３５を用いればその条件を容易に十二分に満たし、しか
も容易に入手し得るが、本発明は必ずしもこのような建
家系排気路Ｂから捕集したダストを使わなくてもよい。
またダスト３５の吹き込み口についても必ずしも活性炭
投入装置２７を使用しなくても、バグハウス１３の上流
であればよい。The dust 3 constituting the primary filtration layer 36
5 adheres to the surface of the fiber material constituting the filter 30 by forming 50% or more of the fine powder having a particle size of 1 micron or less. Therefore, even when the filter 30 is periodically vibrated for cleaning and the activated carbon 24 is shaken off, the primary filtration layer 36 does not peel off from the fiber material, and the filtration surface is always kept dense and the filtration performance is maintained. Therefore, the dioxin collection efficiency is further improved. Here, the separation of the primary filtration layer 36 is prevented to prevent the
In order to maintain the adhesiveness of the fine powder to the filter, it is desirable that the filter is made of a fiber material in a fluffy form to which the fine powder is easily adhered, and that the ratio of the fine powder is 1 micron or less. It must be contained at 50% or more. For this reason, if the dust 35 collected from the building system exhaust passage B is used, the conditions can be satisfied more easily and can be easily obtained. However, the present invention is not necessarily limited to such a building system exhaust passage B. There is no need to use the collected dust.
Also, the blowing port of the dust 35 does not necessarily need to use the activated carbon charging device 27, but may be provided upstream of the bag house 13.

【００２０】バグハウス１３では活性炭と建家ダストと
の混合体３７が排出されるが、この混合体３７はアーク
炉１のインジェクション材または先入れ材として使用す
ることができ、ダイオキシン等の有害物質はその際に熱
分解されるので、有害物質が外部に排出されることもな
い。そして、バグハウス１３に排ガスを通すことで、該
バグハウス１３の上部から清浄化された排ガスのみが大
気中に排出される。In the bag house 13, a mixture 37 of activated carbon and house dust is discharged. This mixture 37 can be used as an injection material or a pre-fill material for the arc furnace 1 and is a harmful substance such as dioxin. Is thermally decomposed at that time, so that no harmful substances are discharged outside. Then, by passing the exhaust gas through the bag house 13, only the purified exhaust gas is discharged from the upper portion of the bag house 13 into the atmosphere.

【００２１】[0021]

【発明の効果】このように本発明は、操業開始前に建家
系排気路に設けられたバグハウスの上流から粒径１ミク
ロン以下の微粉体を５０％以上含んだダストを吹き込む
ことによって該バグハウスのフィルタの表面に予め該ダ
ストによる一次濾過層を形成させておき、操業中に直引
系排気路に活性炭を吹き込み該直引系排気路の排ガスを
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て活性炭に吸着され易くなる
とともに、該活性炭を該一次濾過層で効率よく捕集でき
るようになり、アーク炉操業による有害物質の排出を効
果的に抑制できるようにする有益な効果がある。As described above, according to the present invention, before starting operation, dust containing 50% or more of fine powder having a particle size of 1 micron or less is blown from the upstream of the bag house provided in the exhaust passage of the building system. A primary filtration layer made of the dust is previously formed on the surface of the filter of the house, and activated carbon is blown into the exhaust line of the direct drawing system during operation to guide the exhaust gas of the exhaust line of the direct drawing system to the exhaust line of the building system. Since the activated carbon is mixed with the exhaust gas from the exhaust path and the activated carbon is collected in the baghouse, dioxin is solidified and easily absorbed by the activated carbon, and the activated carbon can be efficiently collected by the primary filtration layer. As a result, there is a beneficial effect that the emission of harmful substances due to the operation of the arc furnace can be effectively suppressed.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明に係るアーク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 arc 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】バグハウスのフィルタの断面図。FIG. 3 is a cross-sectional view of a baghouse filter.

【図４】バグハウスのフィルタの作動状態を示す断面
図。FIG. 4 is a sectional view showing an operation state of a filter of the bag house.

【図５】ダイオキシンの状態図。FIG. 5 is a phase diagram of dioxin.

【符号の説明】[Explanation of symbols]

Ａ 直引系排気路 Ｂ 建家系排気路 １ アーク炉 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 活性炭吹込口 ２４ 活性炭 ２７ 活性炭投入装置 ３０ フィルタ ３１ 建家系ダスト捕集装置 ３５ ダスト ３６ 一次濾過層 DESCRIPTION OF SYMBOLS A Direct exhaust system B Exhaust system system 1 Exhaust system 1 Arc furnace 2 Exhaust gas outlet 4 Ceiling hood 6 Combustion tower 7 Cooling tower 8 Direct system baghouse 9 Mixing tower 10 Blower 12 Blower 13 Baghouse 20 Activated carbon inlet 24 Activated carbon 27 Activated carbon Input device 30 Filter 31 Built-in dust collector 35 Dust 36 Primary filtration layer

───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 4D058 JA04 JB14 JB24 JB25 JB36 KB05 KB11 KB12 MA01 MA54 NA07 QA03 QA09 RA15 RA19 SA20 TA03 UA01 UA03 UA10 UA11 UA25 4K014 CD16 4K056 AA05 BA02 BB08 CA02 CA20 DB04 DB07 DB15 DB17 DB26 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 4D058 JA04 JB14 JB24 JB25 JB36 KB05 KB11 KB12 MA01 MA54 NA07 QA03 QA09 RA15 RA19 SA20 TA03 UA01 UA03 UA10 UA11 UA25 4K014 CD16 4K056 AA05 BA02 BB08 DB02 DB07 DB07

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 アーク炉から排ガスを直接吸引する直引
系排気路と、アーク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排ガス処理装
置において、操業開始前に建家系排気路に設けられたバ
グハウスの上流から粒径１ミクロン以下の微粉体を５０
％以上含んだダスト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該ダストによる一次濾過層を
形成させておき、操業中に直引系排気路に活性炭を吹き
込み該直引系排気路の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アーク炉
の排ガス処理方法。1. An exhaust gas treatment apparatus comprising a direct exhaust system for directly sucking exhaust gas from an arc furnace and a building exhaust system for indirectly sucking exhaust gas from a ceiling hood of an arc furnace building starts operation. 50 fine powder with a particle size of 1 micron or less was placed upstream of the baghouse,
% Or more, a primary filtration layer of the dust is previously formed on the surface of the filter of the baghouse by blowing the dust containing at least%, and activated carbon is blown into the direct exhaust line during operation to exhaust gas from the direct exhaust line. Characterized in that the activated carbon is collected in the bag house by mixing the exhaust gas with the exhaust gas from the house-related exhaust passage. 【請求項２】 アーク炉の操業中に建家系排気路に吸引
された排ガスから捕集したダストを操業開始前にバグハ
ウスの上流に吹き込み一次瀘過層を形成させることを特
徴とした請求項１に記載のアーク炉の排ガス処理方法。2. The method according to claim 1, wherein dust collected from exhaust gas sucked into the exhaust line of the building system during operation of the arc furnace is blown upstream of the baghouse before starting operation to form a primary filtration layer. An exhaust gas treatment method for an arc furnace according to claim 1. 【請求項３】 建家系排気路のバグハウスのフィルタは
微粉体が被着し易い毛羽立った繊維材からなるものであ
る請求項１または２に記載のアーク炉の排ガス処理方
法。3. The exhaust gas treatment method for an arc furnace according to claim 1, wherein the filter of the baghouse in the exhaust line of the building system is made of a fluffy fiber material to which fine powder is easily adhered.
JP19249498A 1998-06-22 1998-06-22 Treatment of waste gas of arc furnace Pending JP2000005537A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19249498A JP2000005537A (en) 1998-06-22 1998-06-22 Treatment of waste gas of arc furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19249498A JP2000005537A (en) 1998-06-22 1998-06-22 Treatment of waste gas of arc furnace

Publications (1)

Publication Number Publication Date
JP2000005537A true JP2000005537A (en) 2000-01-11

Family

ID=16292248

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19249498A Pending JP2000005537A (en) 1998-06-22 1998-06-22 Treatment of waste gas of arc furnace

Country Status (1)

Country Link
JP (1) JP2000005537A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109737744A (en) * 2018-12-13 2019-05-10 朱席 A kind of novel waste aluminum smelting furnace

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109737744A (en) * 2018-12-13 2019-05-10 朱席 A kind of novel waste aluminum smelting furnace

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