JPH06117780A - Equipment for disposing of exhaust gas from electric furnace or scrap-preheating apparatus therefor - Google Patents

Equipment for disposing of exhaust gas from electric furnace or scrap-preheating apparatus therefor

Info

Publication number
JPH06117780A
JPH06117780A JP26471992A JP26471992A JPH06117780A JP H06117780 A JPH06117780 A JP H06117780A JP 26471992 A JP26471992 A JP 26471992A JP 26471992 A JP26471992 A JP 26471992A JP H06117780 A JPH06117780 A JP H06117780A
Authority
JP
Japan
Prior art keywords
exhaust gas
electric furnace
combustion
gas
preheating
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
Application number
JP26471992A
Other languages
Japanese (ja)
Other versions
JP3190452B2 (en
Inventor
Makoto Takahashi
誠 高橋
Isao Arimitsu
功 有光
Hiroshi Iida
洋 飯田
Takero Sato
健朗 佐藤
Original Assignee
Nippon Steel Corp
新日本製鐵株式会社
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 Nippon Steel Corp, 新日本製鐵株式会社 filed Critical Nippon Steel Corp
Priority to JP26471992A priority Critical patent/JP3190452B2/en
Publication of JPH06117780A publication Critical patent/JPH06117780A/en
Application granted granted Critical
Publication of JP3190452B2 publication Critical patent/JP3190452B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE:To safely remove aromatic chlorine compounds and so on in exhaust gas, by a method wherein the exhaust gas heated by burning is maintained in a heat-maintaining chamber, is introduced into a gas cooler, and is directly cooled with spray water, and powderlike slaked lime and so on are blown into the exhaust gas, following which the slaked lime and so on are caught through a bag filter. CONSTITUTION:Exhaust gas from an electric furnace 1 is introduced into a combustion apparatus 5 by mixing through a duct 2, is heated by being mixed with burner-burnt gas and is maintained under a high-temperature condition thereof in a heat-maintaining chamber 7. The exhaust gas discharged from the heat-maintaining chamber 7 is introduced into a gas cooler 8 and is directly cooled with water particles splayed from a splay nozzle 9. Furthermore, fine particles such as slaked lime are blown into the exhaust gas by an adsorbent- feeding apparatus 10 and are allowed to absorb aromatic chlorine compounds remaining in the exhaust gas and to catch together with dust in the exhaust gas through a bag filter 11. In addition, heat-exchangers each are provided on an exhaust gas duct from the heat- maintaining chamber 7 and on another exhaust gas duct ranging from the electric furnace 1 or a scrap-preheating apparatus therefor to the combustion apparatus 5 by mixing or the combustion apparatus 5.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、金属材料を溶解ある
いは精錬する電気炉から溶解・精錬・昇熱中に発生する
排ガス、あるいは、金属材料を電気炉内またはスクラッ
プ予熱専用装置にて予熱する時に発生する排ガス中に含
まれる有害成分を除去する設備に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to exhaust gas generated during melting, refining and heating from an electric furnace for melting or refining metal materials, or when preheating metal materials in an electric furnace or in a dedicated device for scrap preheating. The present invention relates to equipment for removing harmful components contained in generated exhaust gas.

【0002】[0002]

【従来の技術】金属材料を電気炉内またはスクラップ予
熱専用装置にて予熱する場合、排ガス中に有害成分とし
て白煙、悪臭が発生し、作業環境上問題となっている。
この白煙は、金属材料に付着している油分が蒸発しミス
ト状になったもので、集塵装置内の濾布の目詰まり、あ
るいは火災の原因となる。また、排ガスの悪臭は、ホル
ムアルデヒド、アセトアルデヒド、トルエン、スチレ
ン、エタノール、アセトン、メチルエチルケトン等の臭
気成分によるもので、工場内はもとより、周辺住民への
影響も大きくなっている。これら排ガス中に含まれる有
害成分を除去する方法として様々な方法が提案されてい
る。例えば、電気炉から発生するガスを利用する除去方
法として、特開昭56−168083号公報によれば、
スクラップ予熱装置から排出される悪臭物質等を含むガ
スを、電気炉から排出される高温ガスと合流させること
により排ガス中に含まれる悪臭物質等を酸化分解すると
している。
2. Description of the Related Art When a metal material is preheated in an electric furnace or in a dedicated device for preheating scrap, white smoke and a bad odor are generated as harmful components in the exhaust gas, which is a problem in the working environment.
This white smoke is a mist formed by the evaporation of oil adhering to the metal material, which may cause clogging of the filter cloth in the dust collector or a fire. Further, the offensive odor of exhaust gas is due to odorous components such as formaldehyde, acetaldehyde, toluene, styrene, ethanol, acetone, and methyl ethyl ketone, and the influence on not only the inside of the factory but also the inhabitants of the surrounding area is increasing. Various methods have been proposed as methods for removing harmful components contained in the exhaust gas. For example, as a removal method using gas generated from an electric furnace, according to Japanese Patent Laid-Open No. 168083/1986,
It is said that the odorous substances contained in the exhaust gas are oxidatively decomposed by combining the gas containing the malodorous substances discharged from the scrap preheating device with the high temperature gas discharged from the electric furnace.

【0003】また、例えば薬液を利用して除去する方法
として、特開昭59−69687号公報によれば、スク
ラップ予熱装置から排出された排ガスを多孔プラスチッ
ク製のボール中を通過させ、ボール表面の液膜との気液
接触によって排ガス中の悪臭、紫煙を除去するとしてい
る。一方、排ガスを直接燃焼、加熱して有害成分を除去
する直接燃焼方式が、『悪臭防止技術マニュアル(III)
/1980年6月10日公害対策技術同友会発行3〜8
ページ』に紹介されている。これは、排ガス中に含まれ
る臭気成分を燃焼炉に導入してバーナーにより直接燃
焼、加熱することにより分解するものである。
Further, as a method for removing the chemicals using a chemical solution, for example, according to Japanese Patent Laid-Open No. 59-69687, exhaust gas discharged from a scrap preheating device is passed through a ball made of a porous plastic to remove the surface of the ball. It is said that the foul odor and purple smoke in the exhaust gas are removed by gas-liquid contact with the liquid film. On the other hand, the direct combustion method that directly burns and heats the exhaust gas to remove harmful components is described in "Modorous Technology Manual (III)"
/ June 10, 1980 Pollution Control Technology Doyukai 3-8
Page ”. In this method, the odorous components contained in the exhaust gas are introduced into a combustion furnace and directly burned and heated by a burner to decompose them.

【0004】[0004]

【発明が解決しようとする課題】ところが、金属材料を
電気炉内またはスクラップ予熱専用装置にて予熱する場
合だけでなく、電気炉内で材料を溶解、昇温する場合に
も、電気炉あるいはスクラップ予熱専用装置から発生す
る排ガス中には、上記以外の有害物質、例えば、HC
l、SOx、NOx、芳香族塩素化合物も種々含まれて
いる。従来技術として示した上記の方法は、排ガス内の
ある特定の有害成分、すなわち、白煙、悪臭の除去を主
目的にしたものである、それ以外の有害成分、特に、芳
香族塩素化合物成分等を所定のレベルまで充分に下げ得
るプロセスとはなっていない。また、例えば、排ガスを
燃焼、加熱する直接燃焼方式では、バーナー燃焼のため
の燃焼が多量に必要でランニングコストが嵩む結果とな
る。そこで、本発明では、材料の溶解中・昇温中の電気
炉、あるいは、材料を予熱中のスクラップ予熱装置また
は電気炉から発生する排ガス中に含まれる有害成分特に
芳香族塩素化合物成分等を安全に除去できるプロセスの
提供を目的とする。また、その除去に当たっては信頼性
が高く、尚かつ省エネルギーが実現できることを目的と
する。
However, not only when the metal material is preheated in the electric furnace or in the scrap preheating dedicated device, but also when the material is melted and heated in the electric furnace, the electric furnace or the scrap is heated. In the exhaust gas generated from the dedicated preheating device, harmful substances other than the above, such as HC
1, various kinds of SOx, NOx and aromatic chlorine compounds are also contained. The above-mentioned method shown as the prior art is intended to remove certain harmful components in exhaust gas, that is, white smoke and malodor, other harmful components, in particular, aromatic chlorine compound components, etc. Is not a process that can be sufficiently lowered to a predetermined level. Further, for example, in the direct combustion method in which exhaust gas is combusted and heated, a large amount of combustion is required for burner combustion, resulting in an increase in running cost. Therefore, in the present invention, the harmful components contained in the exhaust gas generated from the electric furnace during the melting / heating of the material, or the scrap preheating device or the electric furnace during the preheating of the material, especially the aromatic chlorine compound component, etc. are safe. The purpose is to provide a process that can be removed. In addition, it is also intended that the removal thereof be highly reliable and that energy saving can be realized.

【0005】[0005]

【課題を解決するための手段】上記問題を解決するため
に、本発明における排ガスの処理設備は、 (1)電気炉または電気炉用スクラップ予熱装置からの
排ガスの処理設備であって、電気炉または電気炉用スク
ラップ予熱装置からの排ガスの後流にバーナーを燃焼さ
せ、該燃焼ガスと前記排ガスを混合加熱する燃焼混合装
置または、該排ガス中の酸素でバーナーを燃焼させ、前
記排ガスを加熱する燃焼装置を設け前記燃焼混合装置ま
たは、燃焼装置からのガスの後流に該ガスの保持室を設
け前記保持室からのガスの後流に該ガスのガスクーラを
設け前記ガスクーラからのガスの後流にバグフィルター
を設けたことを特徴とする電気炉または電気炉用スクラ
ップ予熱装置からの排ガスの処理設備。 (2)ガスクーラとバグフィルターとの間に芳香族塩素
化合物等の有害成分を吸収する消石灰等の吸着剤供給装
置を設けたことを特徴とする前記(1)記載の電気炉ま
たは電気炉用スクラップ予熱装置からの排ガスの処理設
備。 (3)保持室からの排ガスダクトと電気炉または電気炉
用スクラップ予熱装置から燃焼混合装置または、燃焼装
置への排ガスダクトに前記両排ガスの熱交換装置を設け
たことを特徴とする前記(1)及び(2)記載の電気炉
または電気炉用スクラップ予熱装置からの排ガスの処理
設備。 (4)保持室からの排ガスダクトと燃焼混合装置への燃
焼用空気供給ダクトに前記排ガスと燃焼用空気との熱交
換装置を設けたことを特徴とする前記(1)(2)及び
(3)記載の電気炉または電気炉用スクラップ予熱装置
からの排ガスの処理設備を特徴とする。
In order to solve the above problems, an exhaust gas treatment facility according to the present invention comprises: (1) an exhaust gas treatment facility from an electric furnace or a scrap preheating device for an electric furnace, which comprises: Alternatively, a burner is burned in the wake of the exhaust gas from the electric furnace scrap preheating device, and a combustion mixer that mixes and heats the combustion gas and the exhaust gas, or the burner is burned with oxygen in the exhaust gas to heat the exhaust gas. A combustion device is provided, and a holding chamber for the gas is provided in the downstream of the gas from the combustion mixer or the combustion device. A gas cooler for the gas is provided in the downstream of the gas from the holding chamber. A downstream of the gas from the gas cooler. A facility for treating exhaust gas from an electric furnace or a scrap preheating device for an electric furnace, characterized in that a bag filter is provided in the. (2) An electric furnace or scrap for an electric furnace according to the above (1), characterized in that an adsorbent supply device such as slaked lime for absorbing harmful components such as aromatic chlorine compounds is provided between the gas cooler and the bag filter. Equipment for treating exhaust gas from the preheater. (3) The heat exchange device for both of the exhaust gases is provided in the exhaust gas duct from the holding chamber and the electric furnace or the scrap preheating device for the electric furnace to the combustion mixer or the exhaust gas duct to the combustion device. ) And (2), the facility for treating exhaust gas from the electric furnace or the scrap preheating device for the electric furnace. (4) The heat exchange device for the exhaust gas and the combustion air is provided in the exhaust gas duct from the holding chamber and the combustion air supply duct to the combustion mixing device. ). The facility for treating exhaust gas from an electric furnace or a scrap preheating device for an electric furnace as described above.

【0006】[0006]

【作用】材料の溶解中・昇温中の電気炉、あるいは、材
料を予熱中のスクラップ予熱装置または電気炉から発生
する排ガスを、燃焼混合装置に導入してバーナーによっ
て燃焼加熱し、尚かつ、加熱した排ガスをある一定時間
以上保持室内に保持することにより、有害成分である芳
香族塩素化合物の大部分は分解される。ところが、一度
分解された芳香族塩素化合物はある低温度域で保持され
ると再生成するため、加熱した排ガスをガスクーラーに
導入し、噴霧水によってガスを直接冷却し、その温度域
を短時間で通過させて再生成を防ぐ。ここで、事前に予
熱した材料を溶解あるいは昇温する場合の電気炉から発
生する排ガス中の、芳香族塩素化合物成分レベルはもと
もとあまり高くないため、前記のように燃焼加熱し、尚
かつ、加熱した排ガスをある程度一定時間以上保持室内
に保持した後、ガスを急冷却することだけで、排ガス中
の芳香族塩素化合物成分レベルは環境上問題のない充分
低い値となり、これ以上の処理は不要である。
[Function] The exhaust gas generated from the electric furnace during melting / heating of the material, or the scrap preheating device or the electric furnace during preheating the material is introduced into the combustion mixing device and burned and heated by the burner, and By holding the heated exhaust gas in the holding chamber for a certain period of time or more, most of the harmful aromatic chlorine compounds are decomposed. However, once decomposed, aromatic chlorine compounds are regenerated when kept in a certain low temperature range, so heated exhaust gas is introduced into the gas cooler, and the gas is directly cooled by spray water, and the temperature range is shortened. To prevent regeneration. Here, since the aromatic chlorine compound component level in the exhaust gas generated from the electric furnace when melting or raising the temperature of the material preheated in advance is not so high from the beginning, the combustion heating is performed as described above, and the heating is performed. After the exhaust gas is held in the holding chamber for a certain period of time or more and then the gas is rapidly cooled, the aromatic chlorine compound level in the exhaust gas becomes a sufficiently low value without environmental problems, and no further treatment is required. is there.

【0007】ところが、事前に予熱をしない材料を溶
解、昇温する場合、あるいは、材料を予熱する場合の電
気炉あるいはスクラップ予熱装置より発生する排ガス中
の、芳香族塩素化合物成分レベルは比較的高く、燃焼混
合装置に導入した後バーナーによって燃焼加熱し、尚か
つ、加熱した排ガスをある一定時間以上保持室内に保持
した後、ガスを急冷却するだけでは、排ガス中の芳香族
塩素化合物成分レベルは環境上問題のない充分低い値に
ならない。従って、冷却した排ガス中に一部残留した芳
香族塩素化合物を、粉状の消石灰等を吸着剤供給装置か
ら排ガス中に吹き込むことにより吸着させ、その後、バ
グフィルターにて排ガス中のダストと共に吹き込んだ消
石灰等を捕獲する。このプロセスによって、予熱をしな
い材料の溶解中・昇温中の電気炉、あるいは、材料を予
熱中のスクラップ予熱装置または電気炉から発生する排
ガス中に含まれる有害成分である芳香族塩素化合物を、
ほぼ100%除去可能となる。尚、バグフィルターにて
捕獲されたダスト、あるいは、ダストと混合した粉状の
消石灰等は、飛散防止のため粒状に成型し、電気炉内に
戻して溶解することによって、廃棄等の処理が不要とな
り、二次公害を防止できる。
However, when the material that is not preheated is melted and heated, or when the material is preheated, the level of the aromatic chlorine compound component in the exhaust gas generated from the electric furnace or the scrap preheating device is relatively high. , After being introduced into a combustion mixing device, burned and heated by a burner, and after holding the heated exhaust gas in a holding chamber for a certain period of time or more, by rapidly cooling the gas, the aromatic chlorine compound component level in the exhaust gas is reduced. The value does not become low enough that there is no environmental problem. Therefore, the aromatic chlorine compound partially remaining in the cooled exhaust gas is adsorbed by blowing powdered slaked lime or the like into the exhaust gas from the adsorbent supply device, and then blown together with the dust in the exhaust gas with a bag filter. Capture slaked lime etc. By this process, the electric chlorine during melting / heating of the material without preheating, or the aromatic chlorine compound which is a harmful component contained in the exhaust gas generated from the scrap preheating device or the electric furnace during preheating the material,
Almost 100% can be removed. Dust captured by the bag filter or powdered slaked lime mixed with dust is molded into granules to prevent scattering and then returned to the electric furnace and melted, eliminating the need for disposal. Therefore, secondary pollution can be prevented.

【0008】一方、排ガスをバーナーにより加熱する燃
焼混合装置において、この加熱後のガスと燃焼混合装置
に導入する被加熱ガス、あるいは、バーナー燃焼用の空
気とを、熱交換装置によって熱交換することにより、被
加熱ガス、あるいは、バーナー燃焼用の空気を予熱し、
バーナーに供給する燃料を減少することができる。もち
ろん、2台の熱交換装置を設置し、被加熱排ガス、燃焼
空気両方を同時に予熱しても良い。これによって、バー
ナーへの燃料供給量をさらに減少することが可能とな
る。また、ガスクーラーに入る排ガスの温度が減少する
ため、ガスクーラーの容量も低減し設備がコンパクトと
なる。
On the other hand, in the combustion mixing device for heating the exhaust gas by the burner, the heated gas and the gas to be heated introduced into the combustion mixing device or the air for burner combustion are heat-exchanged by the heat exchange device. Preheats the gas to be heated or the air for burning the burner,
The fuel supplied to the burner can be reduced. Of course, two heat exchange devices may be installed to preheat both the exhaust gas to be heated and the combustion air at the same time. This makes it possible to further reduce the amount of fuel supplied to the burner. Moreover, since the temperature of the exhaust gas entering the gas cooler is reduced, the capacity of the gas cooler is also reduced and the equipment becomes compact.

【0009】また、燃焼混合装置に導入する被加熱排ガ
ス、すなわち、電気炉あるいはスクラップ予熱装置から
発生する排ガスは、途中の経路で空気が侵入するため排
ガスの割りには比較的酸素濃度が高い。従って、この排
ガスをバーナー燃焼用空気として利用することにより、
本来の燃焼用空気が不要となり、燃焼混合装置出側の排
ガス量は、不要となった燃焼用空気量分が減少し、その
後工程、例えば、ガスクーラー、バグフィルター等の設
備容量を小さくすることができる。この排ガス中の酸素
濃度が燃焼に必要な酸素濃度より低い場合には、純酸素
を混合してやれば良い。また、加熱温度が高くなり過ぎ
る場合には希釈空気を少量混合してやれば良く、いずれ
にしても従来の燃焼空気を使用する場合よりも、大幅に
燃焼混合装置出側の排ガス量を減少させることが可能と
なる。
Further, the heated exhaust gas introduced into the combustion mixing apparatus, that is, the exhaust gas generated from the electric furnace or the scrap preheating device, has a relatively high oxygen concentration relative to the exhaust gas because air invades along the way. Therefore, by using this exhaust gas as burner combustion air,
The original combustion air is no longer needed, and the amount of exhaust gas on the outlet side of the combustion mixing device is reduced by the amount of unnecessary combustion air, and the capacity of subsequent processes, such as gas coolers and bag filters, is reduced. You can If the oxygen concentration in the exhaust gas is lower than the oxygen concentration required for combustion, pure oxygen may be mixed. Also, if the heating temperature becomes too high, it is sufficient to mix a small amount of dilution air, and in any case it is possible to significantly reduce the amount of exhaust gas on the exit side of the combustion mixing device compared to the case of using conventional combustion air. It will be possible.

【0010】[0010]

【実施例】図1は本発明に係る設備構成図であり、吸着
剤供給装置を有する例を示す。これは、電気炉における
金属材料の予熱、溶解、あるいは昇温中に発生する排ガ
ス中に含まれる芳香族塩素化合物を分解除去する。電気
炉1から発生する排ガスはダクト2を通って燃焼混合装
置5に導入される。ここでバーナー燃焼ガスと混合され
て排ガスは加熱されるが、芳香族塩素化合物は800℃
以上に加熱されると分解されるため、800℃以上とな
るようバーナー4の燃焼量を制御して加熱する。バーナ
ー燃焼のための燃料は、灯油、LPG、LNG、都市ガ
ス等何でも良い。燃焼混合装置5にて800℃以上に加
熱された排ガスは、保持室7にて0.5〜5秒間高温の
まま保持される。この保持期間中に、芳香族塩素化合物
は90%以上が分解される。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an equipment configuration diagram according to the present invention, showing an example having an adsorbent supply device. This decomposes and removes aromatic chlorine compounds contained in the exhaust gas generated during preheating, melting, or temperature rise of the metal material in the electric furnace. The exhaust gas generated from the electric furnace 1 is introduced into the combustion mixing device 5 through the duct 2. Here, the exhaust gas is heated by being mixed with the burner combustion gas, but the aromatic chlorine compound is 800 ° C.
Since it decomposes when heated above, the combustion amount of the burner 4 is controlled and heated to 800 ° C. or higher. The fuel for burning the burner may be kerosene, LPG, LNG, city gas, or any other fuel. The exhaust gas heated to 800 ° C. or higher in the combustion mixer 5 is held in the holding chamber 7 at a high temperature for 0.5 to 5 seconds. During this holding period, 90% or more of the aromatic chlorine compound is decomposed.

【0011】保持室7を出た排ガスは、ガスクーラー8
に導入される。ここで、スプレーノズル9より噴霧され
る水の噴霧粒子によって排ガスは直接冷却される。一
度、燃焼加熱によって分解された芳香族塩素化合物は、
300℃雰囲気にてある期間保持されると再生成するた
め、ここでは水による直接冷却によって短時間に急激に
冷却する。従って、ガスクーラー出側においても、保持
室7を出た時点での芳香族塩素化合物レベルがそのまま
保持される。この時点で、芳香族塩素化合物レベルは環
境上問題のないレベルまで減少するが、初期芳香族塩素
化合物レベルが高い、すなわち、事前に予熱をしない材
料を溶解、昇温する場合、あるいは、材料を初めて予熱
する場合で、さらにレベルを下げる必要がある場合に
は、次の工程を追加してさらに処理を行う。
The exhaust gas leaving the holding chamber 7 is a gas cooler 8
Will be introduced to. Here, the exhaust gas is directly cooled by the spray particles of water sprayed from the spray nozzle 9. Aromatic chlorine compounds once decomposed by combustion heating,
Since it regenerates when it is held in the atmosphere of 300 ° C. for a certain period, it is rapidly cooled in a short time by direct cooling with water. Therefore, even on the gas cooler outlet side, the aromatic chlorine compound level at the time of leaving the holding chamber 7 is retained as it is. At this point, the aromatic chlorine compound level is reduced to a level that is environmentally friendly, but the initial aromatic chlorine compound level is high, that is, when the material that is not preheated is melted or heated, or When preheating for the first time and it is necessary to further lower the level, the next step is added and further treatment is performed.

【0012】吸着剤供給装置10によって排ガス中に消
石灰等の粉体を吹き込み、残留芳香族塩素化合物を吸着
させる。ここで、排ガス中に吹き込み粉体としては、消
石灰の他、チャー、石炭灰、活性炭等でも良い。この吹
き込んだ消石灰等は、排ガス等のダストと共にバグフィ
ルター11にて捕獲される。バグフィルター11を経て
スタック12により大気中に放散される排ガス中の芳香
族塩素化合物レベルは、初期の1/500〜1/100
0程度まで低減される。バグフィルター10にて捕獲さ
れたダストあるいはダストを含んだ消石灰等は、ペレタ
イザー13に送られて粒状化され再び電気炉1に投入さ
れて溶解される。従って、廃棄等の処理が不要となり、
二次公害を防止できる。
Powder of slaked lime or the like is blown into the exhaust gas by the adsorbent supply device 10 to adsorb the residual aromatic chlorine compound. Here, in addition to slaked lime, char, coal ash, activated carbon or the like may be used as the powder to be blown into the exhaust gas. The blown slaked lime and the like are captured by the bag filter 11 together with dust such as exhaust gas. The aromatic chlorine compound level in the exhaust gas emitted to the atmosphere by the stack 12 through the bag filter 11 is 1/500 to 1/100 of the initial level.
It is reduced to about 0. Dust captured by the bag filter 10 or slaked lime containing dust is sent to the pelletizer 13 to be granulated and again charged into the electric furnace 1 to be melted. Therefore, processing such as disposal is unnecessary,
Secondary pollution can be prevented.

【0013】図2は本発明に係る基本設備構成におい
て、熱交換装置を2台導入した例を示す。電気炉1から
発生する排ガスダクト2を通って燃焼混合装置5に導入
される前に、熱交換装置A14を通り、保持室7出側の
高温排ガスによって加熱される。従って、燃焼混合装置
5に導入される時点で排ガス温度は上昇しており、バー
ナー4の燃焼量は低減される。また、熱交換装置A14
出側に、さらに熱交換装置B15を設置し、ここでバー
ナー燃焼用空気を予熱することによりバーナー4の燃焼
量はさらに低減される。図3は本発明に係る基本設備構
成において、被加熱排ガスを燃焼用空気として利用する
例を示す。電気炉1から発生する排ガスはダクト2を通
ってバーナー4に直接導入される。すなわち、特別な燃
焼用空気が必要ないため、図1及び図2のような燃焼用
ファン6は不要となる。
FIG. 2 shows an example in which two heat exchange devices are installed in the basic equipment configuration according to the present invention. Before being introduced into the combustion mixing device 5 through the exhaust gas duct 2 generated from the electric furnace 1, it is heated by the high temperature exhaust gas on the outlet side of the holding chamber 7 through the heat exchange device A14. Therefore, the exhaust gas temperature rises when it is introduced into the combustion mixing device 5, and the combustion amount of the burner 4 is reduced. In addition, the heat exchange device A14
By further installing a heat exchange device B15 on the outlet side and preheating the burner combustion air here, the combustion amount of the burner 4 is further reduced. FIG. 3 shows an example in which the heated exhaust gas is used as combustion air in the basic equipment configuration according to the present invention. The exhaust gas generated from the electric furnace 1 is directly introduced into the burner 4 through the duct 2. That is, since no special combustion air is required, the combustion fan 6 as shown in FIGS. 1 and 2 becomes unnecessary.

【0014】[0014]

【発明の効果】本発明によって、電気炉における金属材
料の予熱、溶解、あるいは昇温中に発生する排ガス中に
含まれる有害な芳香族塩素化合物を、発生する量の1/
500〜1/1000にまで低減することが可能とな
る。また、排ガスをバーナーにより加熱する燃焼混合装
置において、この加熱後のガスと燃焼混合装置に導入す
る被加熱ガス、あるいは、バーナー燃焼用の空気とを、
熱交換装置によって熱交換することにより、被加熱ガ
ス、あるいは、バーナー燃焼用の空気を予熱し、バーナ
ーに供給する燃料を減少することができる。従って、芳
香族塩素化合物等の有害成分除去のためのランニングコ
ストを大幅に低減することが可能となる。発明者らの試
算によれば、熱交換装置の導入によってランニングコス
トは半分以下に低減する結果となった。また、被加熱排
ガスをバーナー燃焼用空気として利用することにより、
本来の燃焼用空気が不要となり、燃焼混合装置出側の排
ガス量が減少し、その後工程、例えば、ガスクーラー、
バグフィルター等の設備容量を小さくすることができ
る。発明者らの試算によれば、燃焼混合装置出側の排ガ
ス量は5/6に減少する結果となった。
According to the present invention, a harmful aromatic chlorine compound contained in exhaust gas generated during preheating, melting, or temperature rising of a metal material in an electric furnace is reduced to 1 /
It can be reduced to 500 to 1/1000. Further, in the combustion mixing device for heating the exhaust gas by the burner, the gas after heating and the heated gas to be introduced into the combustion mixing device, or the air for burner combustion,
By exchanging heat with the heat exchanging device, the gas to be heated or the air for burning the burner can be preheated and the fuel supplied to the burner can be reduced. Therefore, the running cost for removing harmful components such as aromatic chlorine compounds can be significantly reduced. According to the calculation by the inventors, the introduction of the heat exchange device has reduced the running cost to less than half. Also, by utilizing the heated exhaust gas as burner combustion air,
The original combustion air becomes unnecessary, the amount of exhaust gas on the exit side of the combustion mixer decreases, and the subsequent process, for example, a gas cooler,
Equipment capacity such as bag filters can be reduced. According to the calculation by the inventors, the exhaust gas amount on the exit side of the combustion mixing device is reduced to 5/6.

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

【図1】本発明に係る基本プロセスの装置構成図、FIG. 1 is a device configuration diagram of a basic process according to the present invention,

【図2】本発明に係る基本プロセスの装置構成におい
て、熱交換装置を2台導入した例を示す図、
FIG. 2 is a diagram showing an example in which two heat exchange devices are introduced in the device configuration of the basic process according to the present invention,

【図3】本発明に係る基本プロセスの装置構成におい
て、被加熱排ガスを燃焼用空気として利用する例を示す
図である。
FIG. 3 is a diagram showing an example in which heated exhaust gas is used as combustion air in an apparatus configuration of a basic process according to the present invention.

【符号の説明】[Explanation of symbols]

1 電気炉 2 ダクト 3 ブロア 4 バーナー 5 燃焼混合装置 6 燃焼空気用ファン 7 保持室 8 ガスクーラー 9 スプレーノズル 10 吸着剤供給装置 11 バグフィルター 12 スタック 13 ペレタイザー 14 熱交換装置A 15 熱交換装置B 16 燃焼装置 1 Electric Furnace 2 Duct 3 Blower 4 Burner 5 Combustion Mixer 6 Combustion Air Fan 7 Holding Chamber 8 Gas Cooler 9 Spray Nozzle 10 Adsorbent Supply Device 11 Bag Filter 12 Stack 13 Pelletizer 14 Heat Exchanger A 15 Heat Exchanger B 16 Combustion device

フロントページの続き (72)発明者 佐藤 健朗 千葉県富津市新富20−1 新日本製鐵株式 会社技術開発本部内Front Page Continuation (72) Inventor Kenro Sato 20-1 Shintomi, Futtsu City, Chiba Shin Nippon Steel Co., Ltd.

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 電気炉または電気炉用スクラップ予熱装
置からの排ガスの処理設備であって、電気炉または電気
炉用スクラップ予熱装置からの排ガスの後流にバーナー
を燃焼させ、該燃焼ガスと前記排ガスを混合加熱する燃
焼混合装置または、該排ガス中の酸素でバーナーを燃焼
させ、前記排ガスを加熱する燃焼装置を設け前記燃焼混
合装置または、燃焼装置からのガスの後流に該ガスの保
持室を設け前記保持室からのガスの後流に該ガスのガス
クーラを設け前記ガスクーラからのガスの後流にバグフ
ィルターを設けたことを特徴とする電気炉または電気炉
用スクラップ予熱装置からの排ガスの処理設備。
1. A facility for treating exhaust gas from an electric furnace or a scrap preheating device for an electric furnace, wherein a burner is burned in a wake of the exhaust gas from the electric furnace or a scrap preheating device for the electric furnace, and the combustion gas and the above A combustion mixing device that mixes and heats the exhaust gas, or a combustion device that burns a burner with oxygen in the exhaust gas to heat the exhaust gas is provided, and the combustion mixing device or a holding chamber for the gas in the wake of the gas from the combustion device. Of the exhaust gas from the electric furnace or the scrap preheating device for an electric furnace, characterized in that a gas cooler for the gas from the holding chamber is provided with a gas cooler for the gas, and a bag filter is provided for the gas downstream from the gas cooler. Processing equipment.
【請求項2】 ガスクーラとバグフィルターとの間に芳
香族塩素化合物等の有害成分を吸収する消石灰等の吸着
剤供給装置を設けたことを特徴とする請求項1記載の電
気炉または電気炉用スクラップ予熱装置からの排ガスの
処理設備。
2. An electric furnace or an electric furnace according to claim 1, wherein an adsorbent supply device for slaked lime or the like that absorbs harmful components such as aromatic chlorine compounds is provided between the gas cooler and the bag filter. Exhaust gas treatment equipment from scrap preheater.
【請求項3】 保持室からの排ガスダクトと電気炉また
は電気炉用スクラップ予熱装置から燃焼混合装置また
は、燃焼装置への排ガスダクトに前記両排ガスの熱交換
装置を設けたことを特徴とする請求項1及び2記載の電
気炉または電気炉用スクラップ予熱装置からの排ガスの
処理設備。
3. A heat exchange device for the two exhaust gases is provided in an exhaust gas duct from the holding chamber and an electric furnace or a scrap preheating device for an electric furnace to a combustion mixing device or an exhaust gas duct to the combustion device. A facility for treating exhaust gas from the electric furnace or the scrap preheating device for the electric furnace according to items 1 and 2.
【請求項4】 保持室からの排ガスダクトと燃焼混合装
置への燃焼用空気供給ダクトに前記排ガスと燃焼用空気
との熱交換装置を設けたことを特徴とする請求項1、2
及び3記載の電気炉または電気炉用スクラップ予熱装置
からの排ガスの処理設備。
4. The heat exchange device for the exhaust gas and the combustion air is provided in the exhaust gas duct from the holding chamber and the combustion air supply duct to the combustion mixing device.
And facility for treating exhaust gas from the electric furnace or the scrap preheating device for the electric furnace described in 3.
JP26471992A 1992-10-02 1992-10-02 Equipment for treating exhaust gas from electric furnaces or scrap preheating equipment for electric furnaces Expired - Lifetime JP3190452B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP26471992A JP3190452B2 (en) 1992-10-02 1992-10-02 Equipment for treating exhaust gas from electric furnaces or scrap preheating equipment for electric furnaces

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26471992A JP3190452B2 (en) 1992-10-02 1992-10-02 Equipment for treating exhaust gas from electric furnaces or scrap preheating equipment for electric furnaces

Publications (2)

Publication Number Publication Date
JPH06117780A true JPH06117780A (en) 1994-04-28
JP3190452B2 JP3190452B2 (en) 2001-07-23

Family

ID=17407237

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP3190452B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100567705B1 (en) * 1997-08-20 2006-09-20 다이도 도꾸슈꼬 가부시끼가이샤 Operation Method of Electric Melting Furnace
KR100875275B1 (en) * 2002-05-14 2008-12-23 세연에스앤알 주식회사 Furnace steelmaking dust treatment apparatus and method
JP2009228974A (en) * 2008-03-24 2009-10-08 Furukawa Electric Co Ltd:The Exhaust gas treating facility and exhaust gas treating method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101437813B1 (en) * 2014-03-12 2014-09-16 순천대학교 산학협력단 A Scrap Preheating Apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100567705B1 (en) * 1997-08-20 2006-09-20 다이도 도꾸슈꼬 가부시끼가이샤 Operation Method of Electric Melting Furnace
KR100875275B1 (en) * 2002-05-14 2008-12-23 세연에스앤알 주식회사 Furnace steelmaking dust treatment apparatus and method
JP2009228974A (en) * 2008-03-24 2009-10-08 Furukawa Electric Co Ltd:The Exhaust gas treating facility and exhaust gas treating method

Also Published As

Publication number Publication date
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