JP5008382B2 - Blast furnace operation method - Google Patents

Blast furnace operation method Download PDF

Info

Publication number
JP5008382B2
JP5008382B2 JP2006316765A JP2006316765A JP5008382B2 JP 5008382 B2 JP5008382 B2 JP 5008382B2 JP 2006316765 A JP2006316765 A JP 2006316765A JP 2006316765 A JP2006316765 A JP 2006316765A JP 5008382 B2 JP5008382 B2 JP 5008382B2
Authority
JP
Japan
Prior art keywords
waste
blast furnace
pcb
hot air
furnace
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
JP2006316765A
Other languages
Japanese (ja)
Other versions
JP2008274310A (en
Inventor
道貴 佐藤
茂行 廣瀬
Original Assignee
道貴 佐藤
茂行 廣瀬
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 道貴 佐藤, 茂行 廣瀬 filed Critical 道貴 佐藤
Priority to JP2006316765A priority Critical patent/JP5008382B2/en
Publication of JP2008274310A publication Critical patent/JP2008274310A/en
Application granted granted Critical
Publication of JP5008382B2 publication Critical patent/JP5008382B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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

  • Manufacture Of Iron (AREA)

Description

本発明は、高炉において銑鉄を製造する際にＰＣＢやダイオキシン等の難処理廃棄物を無害化処理する高炉操業方法に関し、特にこれらの難処理廃棄物を低濃度で含む絶縁油、鉱油等の廃油等を処理する高炉操業方法に関する。   The present invention relates to a blast furnace operating method for detoxifying difficult-to-treat waste such as PCB and dioxin when producing pig iron in a blast furnace, and particularly, waste oil such as insulating oil and mineral oil containing these difficult-to-treat waste at a low concentration. The present invention relates to a blast furnace operating method for processing the like.

ＰＣＢ（ポリ塩化ビイフェニール）は、ビイフェニールの塩化物の総称で一分子中の塩素数が２，３，４，５，６個の塩化物の混合物である。ＰＣＢは物理的および化学的に安定な液体であり、耐熱性および電気絶縁性に優れるため単独で、または、他の鉱物油等と混合し電気機器の絶縁油、熱媒体、潤滑油、複写機のインキ原料など広く工業用製品に使用されてきた。   PCB (polychlorinated biphenyl) is a generic name for biphenyl chloride, and is a mixture of chlorides having 2, 3, 4, 5, 6 chlorine atoms in one molecule. PCB is a physically and chemically stable liquid, and has excellent heat resistance and electrical insulation, so it can be used alone or mixed with other mineral oils, etc. It has been widely used in industrial products such as ink raw materials.

しかし、これらのＰＣＢ含有液は人体に有害であり、かつ、自然界での分解が困難な環境汚染物質であることが判明して、製造及び使用が禁止された。このため、多量に使用されていたＰＣＢや、使用済みのＰＣＢは回収して、無害化処理を行う必要が生じている。ＰＣＢ廃棄物としては、トランス・コンデンサ、安定器・汚泥等のＰＣＢ汚染物等の存在が認識されており、そのＰＣＢ濃度は６０００００〜１００００００ｐｐｍ程度であり、脱塩素化学処理等の化学分解処理、溶融分解処理、還元熱化学分解等の処理方法を用いた処理設備が整備され、処理体制が確立している。   However, these PCB-containing liquids were found to be harmful to the human body and difficult to decompose in nature, and their production and use were prohibited. For this reason, PCBs that have been used in large quantities and used PCBs need to be collected and detoxified. As PCB waste, the presence of PCB contaminants such as transformers, condensers, ballasts and sludge is recognized, and the PCB concentration is about 600,000 to 1,000,000 ppm. Chemical decomposition treatment such as dechlorination chemical treatment, melting Treatment facilities using treatment methods such as decomposition treatment and reductive thermochemical decomposition have been established and a treatment system has been established.

廃油等の液状ＰＣＢの無害化処理については、米国環境保護庁は１２００℃で２秒以上の滞留時間を保持し、かつ、噴霧燃焼するよう指導している。ＰＣＢは８００℃以上の高温酸化性雰囲気においては約１秒以下においてほとんどほぼ完全に分解すること、１１００℃以上の高温においては、例えば０．３秒以下で９９．９９９９％（６−ナイン）まで分解することが知られている。一般的には、１１００℃以上で２秒以上の滞留時間で処理すれば十分に無害化できるとされている。   Regarding the detoxification of liquid PCBs such as waste oil, the US Environmental Protection Agency is instructing to maintain a residence time of at least 2 seconds at 1200 ° C. and spray combustion. PCB decomposes almost completely in about 1 second or less in a high-temperature oxidizing atmosphere of 800 ° C. or higher. For example, up to 99.9999% (6-nine) in 0.3 seconds or less at a high temperature of 1100 ° C. or higher. It is known to decompose. Generally, it is said that the treatment can be made sufficiently harmless if it is processed at a temperature of 1100 ° C. or more and a residence time of 2 seconds or more.

したがって、廃油等の液状ＰＣＢを完全に熱分解するために、通常の焼却炉よりも高温で処理できる、ロータリーキルン式燃焼炉、流動床、酸素バーナー式燃焼炉、ガス化溶融炉、高炉等が用いられている。例えば、高炉等の炉底にセラミックス火格子を設ける等の改造を施し、ＰＣＢ等の廃棄物を処理する、燃焼ガス化溶融処理装置が知られている（例えば、特許文献１参照）。また、高炉等の竪型炉を用いて液状ＰＣＢを処理する際に、炉頂から投入したＰＣＢの炉内での滞留時間を長くするための滞留手段を炉内に設け、ＰＣＢの分解率を上げる技術が知られている（例えば、特許文献２参照）。また、複数の高炉のガス系列を直列につなぎ、高炉に投入されたＰＣＢを処理するシステムが知られている（例えば、特許文献３参照）。さらに、高炉等にＰＣＢ等の有害物質を内蔵したドラム缶や箱を解体処理せずそのまま入れる処理方法が知られている（例えば、特許文献４，５参照）。
特開２００１−２２７７２７号公報 特開２００２−２０４８３６号公報 特開２００１−２２０６０９号公報 特開２００２−１６６２４５号公報 特開２００４−１５４６６６号公報 Therefore, rotary kiln type combustion furnace, fluidized bed, oxygen burner type combustion furnace, gasification melting furnace, blast furnace, etc. that can be processed at a higher temperature than ordinary incinerators to completely decompose liquid PCBs such as waste oil It has been. For example, there is known a combustion gasification and melting apparatus that performs a modification such as providing a ceramic grate at the bottom of a blast furnace or the like and treats a waste such as PCB (for example, see Patent Document 1). In addition, when liquid PCB is processed using a vertical furnace such as a blast furnace, a retention means is provided in the furnace to increase the residence time of the PCB charged from the top of the furnace in the furnace, and the decomposition rate of the PCB is increased. The technique to raise is known (for example, refer patent document 2). In addition, a system is known in which gas series of a plurality of blast furnaces are connected in series to process a PCB charged into the blast furnace (see, for example, Patent Document 3). Furthermore, a processing method is known in which a drum or a box containing a hazardous substance such as PCB is placed in a blast furnace or the like without being disassembled (see, for example, Patent Documents 4 and 5).
JP 2001-227727 A JP 2002-204836 A JP 2001-220609 A JP 2002-166245 A JP 2004-154666 A

一方で、近年、低濃度のＰＣＢに汚染された絶縁油を含むＰＣＢ廃棄物の存在が明らかとなっている。非意図的にＰＣＢが混入した重電気機器、新油使用柱上トランス、ＯＦケーブル等の低濃度ＰＣＢ汚染電気機器等は、ＰＣＢ濃度が数１０ｐｐｍ程度と、ＰＣＢ使用トランスの数万分の１程度ではあるが、大量に存在している。低濃度ＰＣＢ廃棄物を、高濃度ＰＣＢ廃棄物と同様に処理することはコスト高であり、低濃度ＰＣＢ廃棄物を安価かつ確実に処理する方法の確立が望まれている。   On the other hand, in recent years, the existence of PCB waste containing insulating oil contaminated with low-concentration PCB has become clear. Heavy electrical equipment unintentionally mixed with PCBs, new oil-used transformers on poles, and low-concentration PCB-contaminated electrical equipment such as OF cables have a PCB concentration of about several tens of ppm, which is about tens of thousands of PCB transformers. However, it exists in large quantities. It is expensive to treat low-concentration PCB waste in the same manner as high-concentration PCB waste, and it is desired to establish a method for reliably and inexpensively treating low-concentration PCB waste.

低濃度ＰＣＢ廃棄物を従来技術を用いて処理する際には、以下のような問題がある。特許文献１，２に記載の方法は、既存の設備に大幅な改造を加える必要があるうえに、既存の設備を転用するものであるため、既存の設備としての操業、例えば高炉の操業自体（銑鉄の製造）を行なうことは不可能となり、高炉の操業に付随した処理とはできないため、実質的には非常にコスト高である。また、特許文献３に記載の方法は、使用する高炉が「ミニ高炉」であり、炉内で熱分布が発生した場合に、難処理廃棄物の分解が不十分である場合があるため、複数の高炉を直列につなぐものである。すなわち、大型高炉を対象とするものではなく、廃棄物処理の専用炉であり、銑鉄を製造する高炉の操業に付随した処理とはできないため、やはりコスト高である。また、ＰＣＢ廃棄物をどのようにして高炉で処理するかについての記載がなく、具体的な操業形態が不明である。さらに、特許文献４，５に記載の方法は、ＰＣＢ等の有害物質を容器ごと高炉に装入する方法であるため、銑鉄を製造する高炉の操業に用いるとすると、従来設備を用いての投入が困難であり、コスト高である。また、高炉操業に支障をきたすおそれがあり、大量の処理は困難である。   When processing low-concentration PCB waste using conventional technology, there are the following problems. The methods described in Patent Documents 1 and 2 require significant modifications to existing facilities and are diverted from existing facilities. Therefore, operations as existing facilities, such as blast furnace operations themselves ( It is impossible to carry out the production of pig iron), and the treatment associated with the operation of the blast furnace cannot be performed, so that the cost is practically very high. Further, the method described in Patent Document 3 is a “mini blast furnace” to be used, and when heat distribution occurs in the furnace, decomposition of difficult-to-process waste may be insufficient. The blast furnaces are connected in series. In other words, it is not intended for large blast furnaces, but is a dedicated furnace for waste treatment, and cannot be accompanied by the operation of the blast furnace for producing pig iron, so it is also expensive. Further, there is no description on how to treat PCB waste in a blast furnace, and the specific operation mode is unknown. Furthermore, since the methods described in Patent Documents 4 and 5 are methods for charging hazardous substances such as PCBs into the blast furnace together with the containers, if they are used for the operation of a blast furnace for producing pig iron, they are charged using conventional equipment. Is difficult and expensive. Moreover, there is a risk of hindering blast furnace operation, and a large amount of processing is difficult.

本発明はかかる事情に鑑みてなされたものであって、新規の処理炉を建設することなく、既存の高炉および付帯設備を用いて銑鉄の製造を行なうと同時に、液体難処理廃棄物、特に、低濃度ＰＣＢ廃棄物を安価かつ確実に無害化処理することができる高炉の操業方法を提供することを目的とする。   The present invention was made in view of such circumstances, and without constructing a new treatment furnace, while producing pig iron using an existing blast furnace and ancillary equipment, liquid difficult-to-treat waste, particularly, An object of the present invention is to provide a method for operating a blast furnace capable of detoxifying low-concentration PCB waste at a low cost and with certainty.

上記課題を解決するために、本発明は、以下の（１）〜（４）を提供する。
（１） 難分解性有機塩素化合物を含有する液体廃棄物を高炉の羽口から送風する熱風中に投入し、該熱風と共に前記羽口から高炉内に吹込むことで、銑鉄を製造すると共に前記液体廃棄物を無害化処理する高炉の操業方法。
（２）前記液体廃棄物がＰＣＢを１００ｐｐｍ以下含有する低濃度ＰＣＢ廃棄物であることを特徴とする（１）に記載の高炉の操業方法。
（３）前記液体廃棄物を重油と混合して、前記熱風中に投入することを特徴とする（１）または（２）に記載の高炉の操業方法。
（４）前記液体廃棄物の処理量に応じて、前記液体廃棄物の前記熱風中への投入位置を変更することを特徴とする（１）から（３）のいずれかに記載の高炉の操業方法。 In order to solve the above problems, the present invention provides the following (1) to (4).
(1) a liquid waste containing hardly decomposable organic chlorine compounds was introduced into the hot air sent from the tuyere of the blast furnace, by blowing into a blast furnace from the tuyere together with heat air, wherein along with the production of pig iron Blast furnace operation method for detoxifying liquid waste.
(2) The method for operating a blast furnace according to (1), wherein the liquid waste is low concentration PCB waste containing 100 ppm or less of PCB.
(3) The method for operating a blast furnace according to (1) or (2), wherein the liquid waste is mixed with heavy oil and introduced into the hot air.
(4) in accordance with the processing amount of the liquid waste, operation of blast furnace according to any one of the changing the loading position into the hot air of the liquid waste, characterized in (1) (3) Method.

本発明によれば、難分解性有機塩素化合物を含有する液体廃棄物、特に大量の低濃度ＰＣＢ廃棄物を安価かつ確実に無害化処理することができる。これにより処理コストが高いために放置されていた低濃度ＰＣＢ廃棄物も速やかに処理することができるようになり、長期間の保管による環境汚染の発生も防止することができる。 According to the present invention, liquid waste containing a hardly decomposable organochlorine compound , particularly a large amount of low-concentration PCB waste, can be rendered harmless at low cost and with certainty. As a result, low-concentration PCB waste that has been left unattended due to high processing costs can be quickly processed, and environmental pollution due to long-term storage can be prevented.

以下、本発明について詳細に説明する。
本発明で処理する難処理廃棄物は、液体とする。このような液体難処理廃棄物としては、ＰＣＢ、ダイオキシン、絶縁油、鉱油等の廃油、高温加熱処理が必要な廃棄物があげられる。 Hereinafter, the present invention will be described in detail.
The difficult-to-process waste to be treated in the present invention is liquid. Examples of such liquid difficult-to-treat waste include waste oil such as PCB, dioxin, insulating oil, and mineral oil, and waste that requires high-temperature heat treatment.

低濃度ＰＣＢ廃棄物としては、ＰＣＢ（ポリ塩化ビイフェニール）を含有する液体であって、ＰＣＢを１００ｐｐｍ以下の低濃度で含む絶縁油、鉱油等の廃油等があげられる。   Examples of the low-concentration PCB waste include a liquid containing PCB (polychlorinated biphenyl) and waste oil such as insulating oil and mineral oil containing PCB at a low concentration of 100 ppm or less.

本発明では、ＰＣＢやダイオキシン等の液体難処理廃棄物を無害化処理する高温焼却のための手段として、銑鉄を製造する高炉を用いるものとする。操業中の高炉の羽口から吹込まれる熱風中に難処理廃棄物を投入し、銑鉄を製造する高炉の操業に付随して難処理廃棄物を処理することで、１１００℃以上、２秒以上の滞留時間で処理可能であり、低濃度ＰＣＢ廃棄物の大量処理も低コストで行なうことができる。   In this invention, the blast furnace which manufactures pig iron shall be used as a means for the high temperature incineration which detoxifies liquid difficult-to-process wastes, such as PCB and dioxin. By introducing difficult-to-treat waste into hot air blown from the tuyere of the operating blast furnace and processing the difficult-to-treat waste accompanying the operation of the blast furnace that produces pig iron Therefore, it is possible to process a large amount of low-concentration PCB waste at low cost.

高炉においては、ＰＣＢの熱分解に必要な１１００℃以上の温度、２秒以上の滞留時間が容易に得られる。すなわち、原理的にＰＣＢを含む廃油等を熱風（温度は通常１０００℃以上）に投入した瞬間に廃油が着火燃焼し、１５００℃以上の燃焼ガスを発生する。炉内羽口先のレースウェイでは２０００℃以上の還元雰囲気の燃焼場となり、さらにレースウェイを通過したガス（ＣＯ＋Ｈ２＋Ｎ２の還元性ガス）は炉内を上昇し、鉄鉱石を還元しながら徐々に温度が低下する。炉内測定、数値シミュレーション結果によると、３０００ｍ３級以上の高炉の場合、この還元ガスは羽口軸レベルから約１０ｍ以上、上昇したところで約１１００℃まで低下する。炉内の平均ガス流速が３ｍ／ｓ程度であることを考慮すると、ＰＣＢを含む廃油等を投入した瞬間から１１００℃に低下するまで最低３秒の滞留時間を得ることが期待されることとなる。したがって、本発明に用いる高炉は、羽口軸上から１１００℃の温度領域が１０ｍ以上あることが望ましく、よって羽口軸面から装入面まで２０ｍ以上ある高炉が望ましい。このような高炉としては、３０００ｍ３以上の大型高炉が適している。 In a blast furnace, a temperature of 1100 ° C. or higher necessary for thermal decomposition of PCB and a residence time of 2 seconds or longer can be easily obtained. That is, in principle, waste oil is ignited and burned at the moment when waste oil containing PCB or the like is introduced into hot air (temperature is usually 1000 ° C. or higher), and combustion gas of 1500 ° C. or higher is generated. The raceway at the tip of the furnace becomes a combustion field with a reducing atmosphere of 2000 ° C. or higher, and the gas passing through the raceway (CO + H 2 + N 2 reducing gas) rises in the furnace and gradually reduces iron ore while reducing it. The temperature drops. Furnace measurement, according to the numerical simulation results in the case of 3000 m 3 or higher grade blast furnace, the reducing gas is about 10m or more from the tuyere axis level drops to about 1100 ° C. at elevated. Considering that the average gas flow rate in the furnace is about 3 m / s, it is expected that a residence time of at least 3 seconds will be obtained from the moment when waste oil containing PCB or the like is added until the temperature drops to 1100 ° C. . Therefore, the blast furnace used in the present invention preferably has a temperature range of 1100 ° C. from the tuyere shaft of 10 m or more, and therefore a blast furnace having 20 m or more from the tuyere shaft surface to the charging surface is desirable. As such a blast furnace, a large blast furnace of 3000 m 3 or more is suitable.

このようなことから本発明では大型高炉を用いる。そのため、熱風中への難処理廃棄物の投入位置は、熱風炉から羽口先先端までのいずれの位置でも可能であり、ブローパイプ、環状管、熱風炉から環状管の間に設置された熱風本管等の任意の位置とすることができる。通常の高炉であれば、既存の設備としてブローパイプに重油・微粉炭等を吹込むためのランスが設置されているので、これを利用することが特に好ましい。   Therefore, a large blast furnace is used in the present invention. Therefore, the difficult-to-process waste can be introduced into the hot air at any position from the hot air furnace to the tip of the tuyere, and the hot air installed between the blow pipe, the annular pipe, and the hot air furnace between the annular pipes. It can be in any position such as a tube. In the case of a normal blast furnace, a lance for blowing heavy oil, pulverized coal or the like into the blow pipe is installed as existing equipment, and it is particularly preferable to use this.

液体難処理廃棄物が絶縁油、鉱油等の廃油類である場合、基本的に重油と同じように扱うことができ、重油と同様にランス等を介して高炉羽口から炉内に吹込むことができる。液体難処理廃棄物の粘性上昇時などは加熱すればよい。このためには重油の吹き込み設備を利用することができる。   When the liquid difficult-to-treat waste is waste oil such as insulating oil and mineral oil, it can be handled basically in the same way as heavy oil, and blown into the furnace from the blast furnace tuyeres through a lance etc. as with heavy oil. Can do. What is necessary is just to heat at the time of the viscosity rise of liquid difficult processing waste. For this purpose, heavy oil blowing equipment can be used.

液体難処理廃棄物は単独で熱風中に吹込めばよいが、液体難処理廃棄物と重油とを混合して、熱風中に投入することが好ましい。重油と混合することで、吹き込み燃料の性状の安定化が図れるためである。   The liquid difficult-to-treat waste may be blown into the hot air alone, but it is preferable to mix the liquid difficult-to-treat waste and heavy oil into the hot air. This is because the properties of the injected fuel can be stabilized by mixing with heavy oil.

液体難処理廃棄物と重油との混合方法は特に限定しない。重油タンクに直接投入、または重油タンクと液体難処理廃棄物専用のタンクを設置し、両タンクからの液体を所定比率で合流させて混合したり、液体難処理廃棄物の配管と重油の配管とを合流させて配管内で混合したりしてもよい。   The mixing method of liquid difficult-to-process waste and heavy oil is not particularly limited. Directly put into the heavy oil tank, or install a tank dedicated to heavy oil tank and liquid difficult-to-treat waste, and mix and mix the liquid from both tanks at a predetermined ratio, and the liquid difficult-to-treat waste pipe and heavy oil pipe Or may be mixed in the pipe.

液体難処理廃棄物を熱風中に吹込むと、熱風の温度が低下するので、同時に羽口先温度（ＴＦＴ）が２０００℃を超えるように酸素富化、送風中湿分の調整を行うことが好ましい。   When the liquid difficult-to-treat waste is blown into hot air, the temperature of the hot air decreases, so it is preferable to simultaneously adjust the moisture content during oxygen enrichment and air blowing so that the tuyere tip temperature (TFT) exceeds 2000 ° C. .

上記のように液体難処理廃棄物の熱風中への投入位置は任意の位置とすることができるが、液体難処理廃棄物の処理量に応じて、液体難処理廃棄物の熱風中への投入位置を変更することが、処理量が多い場合であっても確実に無害化処理を行うことができるので好ましい。   As described above, the position where the liquid difficult-to-treat waste is introduced into the hot air can be set at any position, but depending on the amount of liquid difficult-to-treat waste, the liquid difficult-to-treat waste is thrown into the hot air. Changing the position is preferable because the detoxification process can be reliably performed even when the amount of processing is large.

また、銑鉄の生産量の増加により送風量が増加すると、吹込まれた液体難処理廃棄物の炉内の滞留時間が減少し、完全な分解が困難となる場合もある。この場合も同様に、液体難処理廃棄物の吹き込み位置を羽口先端から離すような操作をすることで対応することができる。銑鉄の生産量が低下する場合は逆の操作となる。熱風炉から羽口先先端までの間において、吹き込み位置が熱風炉寄りであるほど難処理廃棄物の加熱時間が長くなるので、液体難処理廃棄物の処理量を増やすことができる。   Further, when the amount of blown air increases due to an increase in the production amount of pig iron, the residence time of the injected liquid difficult-to-treat waste in the furnace decreases, and it may be difficult to completely decompose. In this case as well, it is possible to cope with this by performing an operation of separating the liquid difficult-to-treat waste blowing position from the tip of the tuyere. When pig iron production decreases, the operation is reversed. Between the hot air furnace and the tip of the tuyere tip, the closer the hot air furnace is to the hot air furnace, the longer the heating time of difficult-to-process waste, so that the amount of liquid difficult-to-process waste can be increased.

または、液体難処理廃棄物の処理状況に応じて、液体難処理廃棄物の熱風中への投入位置を変更することも好ましい。例えば、炉頂ガス中のＰＣＢ濃度の測定を実施し、炉頂ガス中のＰＣＢ濃度をモニターして、仮にＰＣＢが残留している場合には、１１００℃以上の高温部を通過するガスの滞留時間を延長するために、吹き込み位置を熱風炉から羽口までの任意の位置（熱風本管、環状管、ブローパイプ）で、羽口から離す方向に調整し、ＰＣＢが残留しない位置を選択する。   Alternatively, it is also preferable to change the input position of the liquid difficult-to-process waste into the hot air according to the processing status of the liquid difficult-to-process waste. For example, the PCB concentration in the furnace top gas is measured, and the PCB concentration in the furnace top gas is monitored. If PCB remains, the gas stays at a high temperature of 1100 ° C or higher. To extend the time, adjust the blowing position at any position from the hot air furnace to the tuyere (hot air main pipe, annular pipe, blow pipe) away from the tuyere, and select a position where no PCB remains. .

または、送風条件、あるいはレースウェイ深度などの炉下部条件に応じて、液体難処理廃棄物の吹き込み位置を変更し、滞留時間を確保する。例えば、羽口先温度（ＴＦＴ）が低下すると、熱分解速度が低下し、難処理廃棄物を完全に分解できないので、上と同様に液体難処理廃棄物の吹き込み位置を羽口先端から離す方向に移動させる。   Or, depending on the blowing condition or the furnace lower condition such as the raceway depth, the blowing position of the liquid difficult-to-treat waste is changed to ensure the residence time. For example, if the tuyere tip temperature (TFT) decreases, the thermal decomposition rate decreases, and difficult-to-treat waste cannot be completely decomposed. Move.

次に、図面を用いて本発明の一実施形態を説明する。図１は、高炉およびその周辺設備の概略図であり、銑鉄を製造する高炉１には熱風炉２で発生させた熱風が羽口３より吹き込まれる。熱風は熱風本管４、環状管６、ブローパイプ５を介して羽口３に到達する。液体難処理廃棄物はこの熱風本管４、環状管６、ブローパイプ５の任意の位置で熱風中に投入されて、羽口３より炉内に吹き込まれる。図１においては、液体難処理廃棄物は重油の吹き込み設備を用いて羽口３より吹込まれる。液体難処理廃棄物はサービスタンク７に投入され、ポンプ８で昇圧されて、ストレーナー９で固体粒子などの異物が除去され、必要に応じて加熱炉１０で加熱されて粘度が調節される。ブローパイプ５より吹込まれる場合は、流量計１１、遮断弁１２、流調弁１３を介して各羽口向けに分配後、遮断弁１２、流調弁１３、流量計１１を介して、さらに後述するランスを介してブローパイプ５内に吹込まれ、羽口３より高炉１内に吹込まれる。熱風本管４より吹込まれる場合は、遮断弁１２を開として、複数の流調弁１３、流量計１１を介して熱風本管４内の所定の位置に吹込まれ、環状管６、ブローパイプ５を経由して羽口３より高炉１内に吹込まれる。これにより液体難処理廃棄物を熱風本管４〜ブローパイプ５の間の適切な位置で、任意の量を炉内に吹込むことが可能となる。   Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view of a blast furnace and its peripheral equipment. Hot air generated in a hot air furnace 2 is blown from a tuyere 3 into a blast furnace 1 for producing pig iron. The hot air reaches the tuyere 3 through the hot air main pipe 4, the annular pipe 6 and the blow pipe 5. The liquid difficult-to-treat waste is introduced into the hot air at any position of the hot air main pipe 4, the annular pipe 6 and the blow pipe 5 and blown into the furnace through the tuyere 3. In FIG. 1, liquid difficult-to-treat waste is blown from the tuyere 3 using heavy oil blowing equipment. The liquid difficult-to-process waste is put into the service tank 7, pressurized by the pump 8, foreign matters such as solid particles are removed by the strainer 9, and heated by the heating furnace 10 as necessary to adjust the viscosity. When blown from the blow pipe 5, after distributing to each tuyere through the flow meter 11, shut-off valve 12, flow control valve 13, further through the shut-off valve 12, flow control valve 13, flow meter 11, It is blown into the blow pipe 5 through a lance described later, and blown into the blast furnace 1 from the tuyere 3. When blown from the hot air main pipe 4, the shutoff valve 12 is opened and blown into a predetermined position in the hot air main pipe 4 through the plurality of flow control valves 13 and the flow meter 11, and the annular pipe 6, blow pipe 5 is blown into the blast furnace 1 from the tuyere 3. Thereby, it becomes possible to blow an arbitrary amount of liquid difficult-to-treat waste into the furnace at an appropriate position between the hot air main pipe 4 and the blow pipe 5.

図２に、ブローパイプ内にランスを介して液体難処理廃棄物を吹込む方法の一例を示す。図２（ａ）は液体難処理廃棄物（廃油）を単独で吹込む場合であり、ブローパイプ５内に挿入されたランス２１ａを介して液体難処理廃棄物（廃油）が羽口３より炉内に吹込まれる。符号２１ｂは併設された微粉炭吹き込み用のランスである。図２（ｂ）は液体難処理廃棄物（廃油）と重油とを混合する場合である。あらかじめ混合された液体難処理廃棄物（廃油）と重油とがブローパイプ５内に挿入されたランス２１ａを介して羽口３より炉内に吹込まれる。図２（ｃ）は液体難処理廃棄物（廃油）と重油とを混合する他の実施形態であり、液体難処理廃棄物（廃油）と重油との配管を合流させて、ランス２１ａ内で液体難処理廃棄物（廃油）と重油とを混合する。混合された液体難処理廃棄物（廃油）と重油とは、ブローパイプ５内に挿入されたランス２１ａを介して羽口３より炉内に吹込まれる。   FIG. 2 shows an example of a method for injecting liquid difficult-to-treat waste into a blow pipe via a lance. FIG. 2 (a) shows a case where liquid difficult-to-process waste (waste oil) is blown alone. Be blown into. Reference numeral 21b denotes a lance for blowing pulverized coal. FIG.2 (b) is a case where liquid difficult-to-process waste (waste oil) and heavy oil are mixed. Liquid difficult-to-process waste (waste oil) and heavy oil mixed in advance are blown into the furnace from the tuyere 3 through a lance 21 a inserted into the blow pipe 5. FIG. 2 (c) shows another embodiment in which liquid difficult-to-process waste (waste oil) and heavy oil are mixed. Mix difficult-to-treat waste (waste oil) and heavy oil. The mixed liquid difficult-to-process waste (waste oil) and heavy oil are blown into the furnace from the tuyere 3 through the lance 21a inserted into the blow pipe 5.

液体難処理廃棄物の熱風中への投入を、ブローパイプに挿入したランスを用いて行なう際には、アトマイザーを先端に装備したアトマイザー付きのランスを用いることが好ましい。ランスの先端は通常図３に示すような形状であり、図の左側から右側に向けて液体難処理廃棄物または液体難処理廃棄物と重油の混合物を注入して噴出させる。アトマイザーは図４に示すような２重管の構造であり、図の左側から右側に向けて吹き込みを行なう場合、中央の内管２２から液体難処理廃棄物または液体難処理廃棄物と重油の混合物を注入し、上下の外管２３，２４から酸素、窒素、空気等を注入することで、小粒径の液滴を噴出させる。このようなアトマイザー付きのランスを使用すると、液体難処理廃棄物が熱風中に十分に拡散されるため、燃焼効率が向上し、液体難処理廃棄物の処理量も増加する。アトマイザーとして、多孔質の特殊ノズルを用いることもできる。アトマイザーを使用しなくても、ランスを２重管とし、内管から液体難処理廃棄物を吹き込み、外管から酸素、窒素、空気等を吹き付け、アトマイズする方法でもよい。   When the liquid difficult-to-treat waste is thrown into the hot air using a lance inserted into the blow pipe, it is preferable to use a lance with an atomizer equipped with an atomizer at the tip. The tip of the lance is usually shaped as shown in FIG. 3, and liquid difficult-to-process waste or a mixture of liquid difficult-to-process waste and heavy oil is injected and ejected from the left side to the right side of the figure. The atomizer has a double pipe structure as shown in FIG. 4, and when blowing from the left side to the right side of the figure, liquid difficult-to-process waste or a mixture of liquid difficult-to-process waste and heavy oil from the central inner tube 22 Then, oxygen, nitrogen, air, or the like is injected from the upper and lower outer tubes 23, 24, thereby ejecting small droplets. When such a lance with an atomizer is used, the liquid difficult-to-process waste is sufficiently diffused into the hot air, so that the combustion efficiency is improved and the amount of liquid difficult-to-process waste is increased. A porous special nozzle can also be used as the atomizer. Even if an atomizer is not used, a method may be used in which the lance is a double pipe, liquid difficult-to-treat waste is blown from the inner pipe, and oxygen, nitrogen, air, etc. are blown from the outer pipe and atomized.

以下、本発明の実施例について説明する。
炉体積５０００ｍ３の、重油吹き込み設備を有する高炉を用いて操業試験を行なった。重油吹き込み設備を、液体難処理廃棄物の吹き込み設備として転用した。液体難処理廃棄物としては、ＰＣＢ濃度１００ｐｐｍの廃油（鉱油）を用い、ポンプで昇圧して高炉まで搬送した。液体難処理廃棄物の吹き込み位置を可変とするために、羽口先端から熱風環状管まで５０ｃｍ間隔にランスをセットできるバルブ付きフランジを設置した。ランスには図４に示すものと同様の、アトマイザー付きの特殊ランスを使用した。 Examples of the present invention will be described below.
An operation test was conducted using a blast furnace having a furnace volume of 5000 m 3 and having a heavy oil blowing facility. The heavy oil blowing equipment was diverted as a liquid difficult-to-treat waste blowing equipment. As liquid difficult-to-treat waste, waste oil (mineral oil) with a PCB concentration of 100 ppm was used, and the pressure was raised by a pump and the waste oil was conveyed to a blast furnace. In order to change the blowing position of the liquid difficult-to-treat waste, a flange with a valve that can set a lance at an interval of 50 cm from the tip of the tuyere to the hot-air annular tube was installed. A special lance with an atomizer similar to that shown in FIG. 4 was used for the lance.

高炉の操業は出銑比２．０ｔ／ｍ３ｄで行なった。羽口先端から熱風環状管側へ５０ｃｍの位置にランスをセットして鉱油を５０ｋｇ／ｔで吹き込んだ。羽口先温度（ＴＦＴ）が２１００℃になるように酸素富化率を調整した。 The operation of the blast furnace was performed at a tapping ratio of 2.0 t / m 3 d. A lance was set at a position of 50 cm from the tip of the tuyere to the hot air annular tube side, and mineral oil was blown in at 50 kg / t. The oxygen enrichment rate was adjusted so that the tuyere temperature (TFT) was 2100 ° C.

その結果、炉頂ガス中のＰＣＢ濃度は０．００１４ｎｇ−ＴＥＱ／ｍ３であり、排出基準の０．１ｎｇ−ＴＥＱ／ｍ３を大幅に下回っていた。 As a result, PCB concentration in the furnace top gas is 0.0014ng-TEQ / m 3, it was significantly lower than 0.1ng-TEQ / m 3 emission standards.

また、鉱油の吹き込み量を１００ｋｇ／ｔとしたところ、炉頂ガス中のＰＣＢ濃度は０．００５７ｎｇ−ＴＥＱ／ｍ３であり、これも排出基準を大幅に下回っていた。 Moreover, when the amount of mineral oil blown was 100 kg / t, the PCB concentration in the furnace top gas was 0.0057 ng-TEQ / m 3 , which was also significantly below the emission standard.

本発明の一実施形態を示す、高炉およびその周辺設備の概略図。The schematic of a blast furnace and its peripheral equipment which shows one Embodiment of this invention. （ａ）液体難処理廃棄物を単独で吹込む場合、（ｂ）液体難処理廃棄物（廃油）と重油とを混合する場合、（ｃ）液体難処理廃棄物（廃油）と重油とを混合する場合の一実施形態を示す概略図。(A) When liquid difficult-to-process waste is blown alone, (b) When liquid difficult-to-process waste (waste oil) and heavy oil are mixed, (c) Liquid hard-to-process waste (waste oil) and heavy oil are mixed Schematic which shows one Embodiment in the case of doing. 通常のランス先端形状を示す概略図。Schematic which shows a normal lance tip shape. アトマイザーの構造を示す概略図。Schematic which shows the structure of an atomizer.

符号の説明Explanation of symbols

１…高炉
２…熱風炉
３…羽口
４…熱風本管
５…ブローパイプ
６…環状管
７…サービスタンク
８…ポンプ
９…ストレーナー
１０…加熱炉
１１…流量計
１２…遮断弁
１３…流調弁
２１ａ，２１ｂ…ランス


DESCRIPTION OF SYMBOLS 1 ... Blast furnace 2 ... Hot stove 3 ... tuyere 4 ... hot air main pipe 5 ... blow pipe 6 ... annular pipe 7 ... service tank 8 ... pump 9 ... strainer 10 ... heating furnace 11 ... flow meter 12 ... shut-off valve 13 ... flow control Valve 21a, 21b ... Lance


Claims (4)

難分解性有機塩素化合物を含有する液体廃棄物を高炉の羽口から送風する熱風中に投入し、該熱風と共に前記羽口から高炉内に吹込むことで、銑鉄を製造すると共に前記液体廃棄物を無害化処理する高炉の操業方法。 A liquid waste containing a hardly decomposable organic chlorine compound is put into hot air blown from a tuyere of a blast furnace, and blown into the blast furnace from the tuyere together with the hot air to produce pig iron and the liquid waste Blast furnace operation method for detoxification treatment. 前記液体廃棄物がＰＣＢを１００ｐｐｍ以下含有する低濃度ＰＣＢ廃棄物であることを特徴とする請求項１に記載の高炉の操業方法。 The method for operating a blast furnace according to claim 1, wherein the liquid waste is low-concentration PCB waste containing 100 ppm or less of PCB. 前記液体廃棄物を重油と混合して、前記熱風中に投入することを特徴とする請求項１または請求項２に記載の高炉の操業方法。 The method of operating a blast furnace according to claim 1 or 2, wherein the liquid waste is mixed with heavy oil and introduced into the hot air. 前記液体廃棄物の処理量に応じて、前記液体廃棄物の前記熱風中への投入位置を変更することを特徴とする請求項１から請求項３のいずれか１項に記載の高炉の操業方法。 The method for operating a blast furnace according to any one of claims 1 to 3, wherein a position where the liquid waste is introduced into the hot air is changed according to a processing amount of the liquid waste. .
JP2006316765A 2006-11-24 2006-11-24 Blast furnace operation method Active JP5008382B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2006316765A JP5008382B2 (en) 2006-11-24 2006-11-24 Blast furnace operation method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006316765A JP5008382B2 (en) 2006-11-24 2006-11-24 Blast furnace operation method

Publications (2)

Publication Number Publication Date
JP2008274310A JP2008274310A (en) 2008-11-13
JP5008382B2 true JP5008382B2 (en) 2012-08-22

Family

ID=40052657

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2006316765A Active JP5008382B2 (en) 2006-11-24 2006-11-24 Blast furnace operation method

Country Status (1)

Country Link
JP (1) JP5008382B2 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3823361B2 (en) * 1995-03-02 2006-09-20 Ｊｆｅスチール株式会社 Method for producing low phosphorous acid by smelting reduction furnace
JP2001019501A (en) * 1999-06-30 2001-01-23 Daido Steel Co Ltd Operation of melting furnace
JP2002166245A (en) * 2000-12-04 2002-06-11 Kangen Yoyu Gijutsu Kenkyusho:Kk Method for directly melting injurious material such as pcb, waste liquid, or waste oil and equipment housing the material

Also Published As

Publication number Publication date
JP2008274310A (en) 2008-11-13

Similar Documents

Publication Publication Date Title
CA1283002C (en) Method and apparatus for treating waste containing organic contaminants
CN103648669B (en) Waste processing
US5770784A (en) Systems for the treatment of commingled wastes and methods for treating commingled wastes
US20150010359A1 (en) Advanced Thermal Conductive Heater System for Environmental Remediation and the Destruction of Pollutants
US20050204969A1 (en) Method and apparatus for treating waste
CN112815717B (en) Plasma melting furnace
US4925389A (en) Method and apparatus for treating waste containing organic contaminants
US4766822A (en) Method and apparatus for treating waste containing organic contaminants
JP3957737B1 (en) Combustion system for flame-retardant high-viscosity waste such as PCB
CN113266834A (en) Organic industrial waste salt treatment method, melting bed and treatment system
CN219976435U (en) Medical waste treatment system of plasma fusion coupling incinerator
CN109974009B (en) Three-waste integrated reactor and method for treating nitrous gases
JP5008382B2 (en) Blast furnace operation method
CN207933241U (en) A kind of apparatus and system of thermal desorption harmless treatment oil sludge
JP2008029967A (en) Method and apparatus for treating contaminants
JP2005180881A (en) Waste treatment device
Vallero Thermal waste treatment
EP2342497B1 (en) System for the gasification of waste organic material
JP2005262099A (en) Treating method for making organic contaminated waste material harmless and treating apparatus
Lapcik et al. Possibilities of gasification and pyrolysis technology in branch of energy recovery from waste
US20050031516A1 (en) Method and plant for continuous depollution of earths or sludge
Grasso Thermal Processes
CN111623355A (en) Multi-process cooperative plasma hazardous waste disposal device
Agrawal et al. Destruction of polychlorinated biphenyl and utilization of waste heat in integrated steel plant
WO1997037573A1 (en) Systems for the treatment of commingled wastes and methods for treating commingled wastes

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20090821

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20100520

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20100520

A625 Written request for application examination (by other person)

Free format text: JAPANESE INTERMEDIATE CODE: A625

Effective date: 20090821

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20111208

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20120117

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20120315

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20120515

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20120529

R150 Certificate of patent or registration of utility model

Ref document number: 5008382

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20150608

Year of fee payment: 3

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250