JP4477944B2 - Tuna structure of waste melting furnace and method of blowing combustible dust - Google Patents

Tuna structure of waste melting furnace and method of blowing combustible dust Download PDF

Info

Publication number
JP4477944B2
JP4477944B2 JP2004174243A JP2004174243A JP4477944B2 JP 4477944 B2 JP4477944 B2 JP 4477944B2 JP 2004174243 A JP2004174243 A JP 2004174243A JP 2004174243 A JP2004174243 A JP 2004174243A JP 4477944 B2 JP4477944 B2 JP 4477944B2
Authority
JP
Japan
Prior art keywords
oxygen
combustible dust
waste
tuyere
melting 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.)
Expired - Fee Related
Application number
JP2004174243A
Other languages
Japanese (ja)
Other versions
JP2005098676A (en
Inventor
一毅 村橋
也寸彦 加藤
猛 西
裕三 堺
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.)
Nippon Steel Engineering Co Ltd
Original Assignee
Nippon Steel Engineering 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 Nippon Steel Engineering Co Ltd filed Critical Nippon Steel Engineering Co Ltd
Priority to JP2004174243A priority Critical patent/JP4477944B2/en
Priority to CN2004800433040A priority patent/CN1997854B/en
Priority to EP04799883A priority patent/EP1767856A1/en
Priority to KR1020067025842A priority patent/KR20070026568A/en
Priority to PCT/JP2004/017823 priority patent/WO2005121646A1/en
Publication of JP2005098676A publication Critical patent/JP2005098676A/en
Application granted granted Critical
Publication of JP4477944B2 publication Critical patent/JP4477944B2/en
Expired - Fee Related 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Description

本発明は、一般廃棄物、産業廃棄物などの廃棄物を溶融処理する廃棄物溶融炉への可燃性ダスト吹き込み装置とその方法に関する。   The present invention relates to a combustible dust blowing device and a method for blowing it into a waste melting furnace for melting waste such as general waste and industrial waste.

一般廃棄物、産業廃棄物等の廃棄物の処理方法の一つとして、シャフト炉型の廃棄物溶融炉で廃棄物を乾燥、熱分解、燃焼、溶融して、スラグとメタルにする廃棄物溶融処理がある（特許文献１及び２参照）。図６は、従来のシャフト炉型の廃棄物溶融炉の説明図で、廃棄物溶融炉１には、廃棄物が副資材であるコークス、石灰石とともに、炉上部から２重シール弁機構の装入装置２を介して装入され、炉内で乾燥、熱分解、燃焼、溶融の過程を経て出滓口３からはスラグが排出される。廃棄物中の可燃物は、一部が乾留されてガスとなって排出され、また一部は炉下部で羽口から吹き込まれた空気及び酸素によって燃焼するが、残りの可燃物は可燃性ダストとなって溶融炉１の炉頂から排出される。廃棄物溶融炉１の炉頂から排出されるダストは、可燃性ダスト捕集装置（サイクロン）５で捕集し、可燃性ダスト貯蔵タンク６に貯蔵され、可燃性ダスト切り出し装置７で切り出されて、酸素富化空気を供給する羽口４から炉内へ吹き込まれる。羽口４から可燃性ダストを吹き込むことで、コークス使用量の低減が可能となる。   As one of the processing methods for waste such as general waste and industrial waste, waste melting into slag and metal by drying, pyrolysis, combustion and melting in a shaft furnace type waste melting furnace There is processing (see Patent Documents 1 and 2). FIG. 6 is an explanatory diagram of a conventional shaft furnace type waste melting furnace. The waste melting furnace 1 is loaded with a double seal valve mechanism from the top of the furnace together with coke and limestone as waste materials. The slag is discharged from the outlet 3 after being charged through the device 2 and undergoing processes of drying, thermal decomposition, combustion and melting in the furnace. Some of the combustibles in the waste are carbonized and discharged as gas, and some are combusted by air and oxygen blown from the tuyeres at the bottom of the furnace, while the remaining combustibles are combustible dust. And discharged from the top of the melting furnace 1. Dust discharged from the top of the waste melting furnace 1 is collected by a combustible dust collecting device (cyclone) 5, stored in a combustible dust storage tank 6, and cut out by a combustible dust cutting device 7. Then, it is blown into the furnace through the tuyere 4 for supplying oxygen-enriched air. By blowing combustible dust from the tuyere 4, the amount of coke used can be reduced.

可燃性ダスト捕集装置５を通過した排ガスは、燃焼室８で燃焼され、ボイラー９で熱回収が行われ、発生した蒸気は蒸気タービン・発電装置１０へ送られる。ボイラー９の排ガスは、集じん装置１１で固気分離され、ブロワ１２により煙突１３から排出される。可燃性ダストを炉内に吹き込む羽口は、特許文献２に記載されているとおり、ダストによる摩耗を防止するために、可燃性ダストを供給する内管と、酸素富化空気を供給する外管とからなる２重管構造となっている。
特開２００１−２１１２３号公報 特開２００２−２６７１２７号公報 The exhaust gas that has passed through the combustible dust collecting device 5 is combusted in the combustion chamber 8, heat is recovered by the boiler 9, and the generated steam is sent to the steam turbine / power generation device 10. The exhaust gas from the boiler 9 is separated into solid and gas by the dust collector 11 and discharged from the chimney 13 by the blower 12. As described in Patent Document 2, the tuyere that blows combustible dust into the furnace has an inner tube that supplies combustible dust and an outer tube that supplies oxygen-enriched air in order to prevent wear due to dust. It has a double pipe structure consisting of
JP 2001-21123 A JP 2002-267127 A

コークス使用量をさらに低減するために、可燃性ダストを羽口より大量に吹き込み、羽口の前で燃焼させ、その熱源により、コークスの代替とすることが考えられる。しかし、従来技術では、可燃性ダストを大量に吹き込んだ場合、可燃性ダストの一部は着火せず、未燃のまま炉外に飛散するため、コークス使用量の低減には限界があった。   In order to further reduce the amount of coke used, it is conceivable that a large amount of combustible dust is blown from the tuyere and burned in front of the tuyere, and the coke is substituted by the heat source. However, in the prior art, when a large amount of combustible dust is blown, a part of the combustible dust is not ignited and scattered outside the furnace without being burned.

そこで、本発明は、廃棄物溶融炉の羽口より吹き込まれた可燃性ダストを羽口前で完全燃焼させ、コークス使用量の低減が可能となる羽口構造及び可燃性ダスト吹き込み方法を提供するものである。   Accordingly, the present invention provides a tuyere structure and a combustible dust blowing method capable of reducing the amount of coke by completely combusting combustible dust blown from the tuyeres of a waste melting furnace in front of the tuyere. Is.

本発明の羽口構造は、炉内に廃棄物をコークス、石灰石と共に装入し、炉体に設けられている羽口から空気又は酸素富化空気を吹き込み、廃棄物を乾燥、熱分解、燃焼、溶融して廃棄物を処理する廃棄物溶融炉において、前記羽口を、粒径が５ｍｍ以下の可燃性ダストと空気又は酸素富化空気を供給する内筒、可燃性ダストの着火用燃料を供給する中間筒、及び着火用燃料燃焼用の酸素を供給する外筒の三重管構造とし、かつ、可燃性ダストと空気又は酸素富化空気を供給する内筒及び可燃性ダストの着火用燃料を供給する中間筒の先端部を、羽口本体筒の先端部から３０〜１００ｍｍ奥に位置させ、着火用燃料を着火して火炎を噴出させて高温の雰囲気を形成することを特徴とする。このとき、可燃性ダスト着火用燃料の吐出流速と、着火用燃料燃焼用酸素の吐出流速は、炉内からの逆流を防ぐために、経験上、１０ｍ／ｓとすることが望ましい。 In the tuyere structure of the present invention, waste is charged into the furnace together with coke and limestone, air or oxygen-enriched air is blown from the tuyere provided in the furnace body, and the waste is dried, pyrolyzed, and combusted. In a waste melting furnace for melting and processing waste, the tuyere is provided with an inner cylinder for supplying combustible dust having a particle size of 5 mm or less and air or oxygen-enriched air, and fuel for igniting combustible dust. An intermediate cylinder to be supplied and an outer cylinder to supply oxygen for ignition fuel combustion , and an inner cylinder to supply combustible dust and air or oxygen-enriched air, and an ignition fuel for combustible dust are provided. The tip of the intermediate cylinder to be supplied is positioned 30 to 100 mm deep from the tip of the tuyere main body cylinder, and the ignition fuel is ignited to emit a flame to form a high temperature atmosphere . At this time, the discharge flow rate of the combustible dust ignition fuel and the discharge flow rate of the ignition fuel combustion oxygen are preferably 10 m / s in order to prevent backflow from the furnace.

但し、流速比＝（着火用燃料の吐出流速（ｍ／ｓ）／着火用燃料燃焼用酸素の吐出流速（ｍ／ｓ））を定義し、流速比が０．２〜５．０の範囲となるように、羽口先端部の各流体の吐出面積を調節すると、内筒から吹き込まれる可燃性ダストの着火性をより向上させることが可能となる。それぞれの吐出面積は、各流体の吐出流速が実流速で、１０〜５０ｍ／ｓとなるようにすることにより、操業中の詰まりや、火炎の吹き飛びもなく、より安定な操業が可能となる。吐出面積は、可燃性ダスト着火用燃料の成分が判明すれば簡単に設定することが可能である。さらに、図２又は図３のような構造をとることで、着火用燃料を変更した場合も、面積比を容易に変更することが可能となり、常に最適な運転が行える。   However, flow rate ratio = (discharge fuel discharge flow rate (m / s) / ignition fuel combustion oxygen discharge flow rate (m / s)) is defined, and the flow rate ratio is in the range of 0.2 to 5.0. Thus, by adjusting the discharge area of each fluid at the tip of the tuyere, it becomes possible to further improve the ignitability of the combustible dust blown from the inner cylinder. Each discharge area can be operated more stably without clogging during operation or blowing off a flame by setting the discharge flow rate of each fluid to an actual flow rate of 10 to 50 m / s. The discharge area can be set easily if the components of the combustible dust ignition fuel are known. Further, by adopting the structure as shown in FIG. 2 or FIG. 3, even when the ignition fuel is changed, the area ratio can be easily changed, and the optimum operation can always be performed.

また、内筒、中間筒の先端は、羽口（外筒）先端より３０〜１００ｍｍ奥まった位置に設置することで、羽口内で、可燃性ダストが確実に着火し、羽口先端より高温の火炎を噴出させることが可能となる。この羽口先端よりの距離については、発明者らが数値解析及び実験を実施した結果、羽口先端からの吐出流が平行流となり、かつ、内筒から吹き込まれる可燃性ダストによる外筒の摩耗のない範囲として設定した。３０ｍｍより短い場合は、羽口先端に循環流が形成され、実際の廃棄物溶融炉の操業において、スラグによる羽口閉塞の懸念がある。逆に、１００ｍｍより長い場合は、内筒より吹き込まれた可燃性ダストが外筒に衝突し、外筒を摩耗させる。   Moreover, the tip of the inner cylinder and the intermediate cylinder is installed at a position 30 to 100 mm deeper than the tip of the tuyere (outer cylinder), so that the combustible dust is surely ignited in the tuyere and the temperature is higher than that of the tuyere tip. It becomes possible to spout a flame. As for the distance from the tip of the tuyere, as a result of numerical analysis and experiments conducted by the inventors, the discharge flow from the tip of the tuyere becomes a parallel flow, and the outer cylinder is worn by combustible dust blown from the inner cylinder. Set as no range. When it is shorter than 30 mm, a circulation flow is formed at the tip of the tuyere, and there is a concern that tuyere is blocked by slag in the actual operation of the waste melting furnace. On the contrary, when it is longer than 100 mm, the combustible dust blown from the inner cylinder collides with the outer cylinder and wears the outer cylinder.

また、本発明の可燃性ダスト吹き込み方法は、廃棄物溶融炉に廃棄物をコークス、石灰石と共に装入し、羽口から空気又は酸素富化空気を吹き込み、廃棄物を乾燥、熱分解、燃焼、溶融して廃棄物を溶融処理する方法であって、可燃性ダストを羽口を介して炉内に吹き込む方法において、前記羽口を内筒、中間筒、及び外筒の三重管構造とし、粒径が５ｍｍ以下の可燃性ダストを空気又は酸素富化空気と共に内筒から、可燃性ダストの着火用燃料を中間筒から、前記着火用燃料を燃焼させる酸素を外筒からそれぞれ炉内に供給するとともに、可燃性ダストと空気又は酸素富化空気を供給する内筒及び可燃性ダストの着火用燃料を供給する中間筒の先端部を、羽口本体筒の先端部から３０〜１００ｍｍ奥に位置させ、着火用燃料を着火して火炎を噴出させることを特徴とする。このとき、内筒に、可燃性ダストとともに吹き込むのは、空気、酸素富化空気のどちらでも可能だが、発明者らの実験結果によれば、酸素濃度２５％以上の酸素富化空気を吹き込めば、羽口先端より高温の火炎を噴出できることがわかった。しかし、酸素濃度４０％以上にしても、溶融温度を上げることができない。これは、羽口近傍のガス温度は、酸素濃度を上昇させると上昇するが、２０００℃レベルになると、ガスの熱解離反応等や吸熱反応が活発になって、それ以上温度は上昇しなくなるためと推定される。そのため、酸素濃度は、高価な酸素の使用を抑制するために４０％程度を上限とするのが経済的である。 Further, the combustible dust blowing method of the present invention is a method of charging waste into a waste melting furnace together with coke and limestone, blowing air or oxygen-enriched air from the tuyere, drying the waste, pyrolysis, combustion, a method of melting treatment of waste by melting, and the method of blowing into the furnace combustible dusts through the tuyeres, the inner cylinder of the tuyere, a triple pipe structure of the intermediate tube, and the outer cylinder, grain Combustible dust having a diameter of 5 mm or less is supplied from the inner cylinder together with air or oxygen-enriched air, fuel for igniting the combustible dust is supplied from the intermediate cylinder, and oxygen for burning the ignition fuel is supplied from the outer cylinder to the furnace. At the same time, the tip of the inner cylinder supplying flammable dust and air or oxygen-enriched air and the intermediate cylinder supplying flammable dust ignition fuel is positioned 30 to 100 mm deep from the tip of the tuyere body cylinder. Ignite the ignition fuel, flame And wherein the ejecting. At this time, either air or oxygen-enriched air can be blown into the inner cylinder together with combustible dust. However, according to the results of experiments by the inventors, if oxygen-enriched air having an oxygen concentration of 25% or more is blown. It was found that a high-temperature flame can be ejected from the tip of the tuyere. However, even if the oxygen concentration is 40% or more, the melting temperature cannot be increased. This is because the gas temperature in the vicinity of the tuyere rises when the oxygen concentration is raised, but when it reaches the 2000 ° C. level, the thermal dissociation reaction and the endothermic reaction of the gas become active, and the temperature does not rise any further. It is estimated to be. Therefore, it is economical for the oxygen concentration to be about 40% in order to suppress the use of expensive oxygen.

また、本発明の可燃性ダスト吹き込み方法は、羽口から吹き込まれる可燃性ダストが、羽口先端で着火し、高温火炎を形成することを狙いとしているため、通常のバーナーと同様に、空気比（酸素比）の管理は重要である。発明者らは、酸素比を以下のように定義し、実験を行った。   In addition, the combustible dust blowing method of the present invention aims at the combustible dust blown from the tuyere igniting at the tip of the tuyere and forming a high-temperature flame. Management of (oxygen ratio) is important. The inventors defined the oxygen ratio as follows and conducted an experiment.

酸素比＝（単位時間あたりのコークス燃焼に必要な酸素量＋単位時間あたりの可燃性ダストの燃焼に必要な酸素量＋単位時間あたりの可燃性ダスト着火用燃料の燃焼に必要な酸素量）／（単位時間当たりに下段羽口内筒より吹き込まれる酸素量＋単位時間当たりに下段羽口外筒より吹き込まれる酸素量）
その結果、特にコークス使用量を３％以下に低減した場合、酸素比を０．９〜１．１程度とすると、スラグ温度が維持できることがわかった。 Oxygen ratio = (amount of oxygen required for coke combustion per unit time + amount of oxygen required for combustion of combustible dust per unit time + amount of oxygen required for combustion of combustible dust ignition fuel per unit time) / (The amount of oxygen blown from the lower tuyere inner cylinder per unit time + the amount of oxygen blown from the lower tuyere outer cylinder per unit time)
As a result, it was found that the slag temperature can be maintained when the oxygen ratio is about 0.9 to 1.1, particularly when the amount of coke used is reduced to 3% or less.

廃棄物溶融炉の羽口を三重管構造とし、内筒からは可燃性ダストと空気又は酸素富化空気を、中間筒からは着火用燃料を、外筒からは前記着火燃料燃焼用の酸素をそれぞれ供給するとともに、可燃性ダストと空気又は酸素富化空気を供給する内筒及び可燃性ダストの着火用燃料を供給する中間筒の先端部を、羽口本体筒の先端部から３０〜１００ｍｍ奥に位置させ、着火用燃料を着火して火炎を噴出させることによって、多量の可燃性ダストによる高温燃焼が可能となり、コークス使用量を大幅に低減できる。また、廃棄物溶融炉の生成ガスから捕集した可燃性ダストに加え、もしくは前記可燃性ダストの代わりにバイオマス燃料や、鉄粉、製鉄ダストなどの燃焼熱も活用できるほか、破砕した廃プラスチックを吹き込むこともでき、コークス使用量の大幅な低減が可能となる。 The waste melting furnace tuyere has a triple pipe structure, combustible dust and air or oxygen-enriched air from the inner cylinder, ignition fuel from the intermediate cylinder, and oxygen for ignition fuel combustion from the outer cylinder. Each of the inner cylinders for supplying combustible dust and air or oxygen-enriched air, and the tip of the intermediate cylinder for supplying fuel for igniting combustible dust, are 30 to 100 mm deep from the tip of the tuyere main body cylinder. By igniting the ignition fuel and injecting the flame, the high temperature combustion with a large amount of combustible dust becomes possible, and the amount of coke used can be greatly reduced. In addition to combustible dust collected from the product gas of the waste melting furnace, or, biomass fuels instead of the combustible dust, iron powder, in addition to take advantage also the heat of combustion of such iron dust, the crushed waste plastics blow write son-in-law and can also, it is possible to a significant reduction in coke consumption.

本発明において、可燃性ダストとして、廃棄物溶融炉の生成ガスから捕集した可燃性ダスト、バイオマス燃料、鉄粉、シュレッダーダスト、製鉄ダスト、破砕した廃プラスチック又は廃タイヤ粉の一種又は二種以上からなる可燃性ダストを用いることができる。   In the present invention, as combustible dust, one or more of combustible dust, biomass fuel, iron powder, shredder dust, iron making dust, crushed waste plastic or waste tire powder collected from the product gas of the waste melting furnace Combustible dust consisting of can be used.

図１は本発明のシャフト炉型の廃棄物溶融設備の説明図で、前述の図６に示す従来例とは羽口以外は同一構成なので、同一構成には同一符号を付し、その説明は省略する。本実施例は、可燃性ダストに廃棄物溶融炉の生成ガスから集じんされた可燃性ダストを使用する例である。   FIG. 1 is an explanatory view of a shaft furnace type waste melting facility according to the present invention, and is the same as the conventional example shown in FIG. 6 except for the tuyere. Omitted. The present embodiment is an example in which combustible dust collected from the product gas of a waste melting furnace is used as combustible dust.

図１において、溶融炉１から排出される生成ガス中の可燃性ダストは、従来より高圧損とし、捕集効率を向上させた可燃性ダスト捕集装置（サイクロン）５で捕集し、可燃性ダスト貯蔵タンク６に貯蔵され、可燃性ダスト切り出し装置７で切り出されて、酸素富化空気を供給する羽口２０から炉内へ吹き込まれ、また着火用燃料及び酸素が供給される。   In FIG. 1, combustible dust in the product gas discharged from the melting furnace 1 is collected by a combustible dust collector (cyclone) 5 that has a higher pressure loss than conventional and improved collection efficiency. It is stored in the dust storage tank 6, cut out by the combustible dust cutting device 7, blown into the furnace from the tuyere 20 that supplies oxygen-enriched air, and fuel for ignition and oxygen are supplied.

図２は本発明の羽口構造を示す概略図である。図２において、羽口２０は、内筒２２と、中間筒２３と、外側の羽口本体筒である、銅製で水冷構造をとった外筒２４の三重管構造とし、内筒２２からは可燃性ダストと酸素富化空気を、中間筒２３からは着火用燃料を、外筒２４からは前記着火燃料燃焼用の酸素をそれぞれ供給し、各筒２２、２３、２４の先端部は開口して導通させ、また図３のように羽口２０の先端には、末広型の着火室２５を形成してもよい。中間筒２３からは例えば、都市ガスやＬＰＧのような気体燃料、もしくは、灯油や重油のような液体燃料が供給され、外筒２４からは、酸素が供給される。外筒２４の酸素は、中間筒２３から供給される燃料と酸素比１となる量として吹き込まれる。着火室２５は耐火物もしくはセラミックス製のバーナタイルを設置することにより形成する。   FIG. 2 is a schematic view showing the tuyere structure of the present invention. In FIG. 2, the tuyere 20 has a triple tube structure of an inner tube 22, an intermediate tube 23, and an outer tuyere main body tube, which is a copper-made outer tube 24 having a water cooling structure. Gas and oxygen-enriched air are supplied from the intermediate cylinder 23, ignition fuel is supplied from the outer cylinder 24, and oxygen for combustion of the ignition fuel is supplied from the outer cylinder 24, and the tips of the cylinders 22, 23, 24 are opened. A divergent ignition chamber 25 may be formed at the tip of the tuyere 20 as shown in FIG. For example, a gas fuel such as city gas or LPG or a liquid fuel such as kerosene or heavy oil is supplied from the intermediate cylinder 23, and oxygen is supplied from the outer cylinder 24. The oxygen in the outer cylinder 24 is blown in as an amount that provides an oxygen ratio of 1 to the fuel supplied from the intermediate cylinder 23. The ignition chamber 25 is formed by installing a refractory or ceramic burner tile.

また、各筒２２、２３の先端部は羽口本体筒の先端部２１からＬ１より奥に位置させて着火用燃料を着火して高温の雰囲気を形成する着火用燃料燃焼空間２６を形成する。 The tip portion of each cylinder 22, 23 forms an ignition fuel combustion space 26 to form a high-temperature atmosphere to ignite the ignition fuel is positioned behind from the front end portion 21 of the tuyere main body tube L1.

羽口２０を三重管構造とすることにより、内筒２２から可燃性ダストを酸素富化空気により搬送し、中間筒２３からは着火用燃料を、外筒２４からは着火燃料用の酸素をそれぞれ供給することにより、着火室２５で着火して燃焼させる。   By forming the tuyere 20 with a triple pipe structure, combustible dust is conveyed from the inner cylinder 22 by oxygen-enriched air, ignition fuel from the intermediate cylinder 23, and oxygen for ignition fuel from the outer cylinder 24, respectively. By supplying, the ignition chamber 25 is ignited and burned.

表１は四種類の羽口の条件を示し、常温大気中にて燃焼試験を行った。ここで、可燃性ダストは、溶融炉からの生成ガスから捕集した可燃性ダストを、着火用燃料にはＬＰＧを用いた。炉内では、大気中よりはるかに高温であり、ダストは燃焼しやすいため、もっとも厳しい条件での試験と仮定できる。

Figure 0004477944
Table 1 shows the conditions of four types of tuyere, and a combustion test was conducted in the room temperature atmosphere. Here, the combustible dust used was combustible dust collected from the generated gas from the melting furnace, and LPG was used as the ignition fuel. In the furnace, it is much hotter than in the atmosphere, and dust easily burns, so it can be assumed that the test is under the most severe conditions.
Figure 0004477944

各羽口の保炎できる下限のＬＰＧ吹き込み量（Ｎｍ３／ｈ）、羽口先温度（℃）、未燃分が発生しない上限のダスト供給量（ｋｇ／ｈ）は、表２の試験結果を示すとおりである。

Figure 0004477944
The lower limit LPG blowing amount (Nm 3 / h), tuyere tip temperature (° C.), and the upper limit dust supply amount (kg / h) at which no unburned matter is generated are the test results shown in Table 2. It is shown.
Figure 0004477944

試験の結果、ＬＰＧを吹き込まなければ保炎は不可能であり、比較例の羽口では失火したが、本発明の実施例では、少量のＬＰＧ吹き込み量にて、多量のダストによる高温燃焼が可能であり、性能が高いことがわかった。   As a result of the test, flame holding is not possible unless LPG is blown, and the fire of the tuyeres of the comparative example was misfired. However, in the example of the present invention, high temperature combustion with a large amount of dust is possible with a small amount of LPG blown It was found that the performance was high.

図４は本発明の別実施例のシャフト炉型の廃棄物溶融設備の説明図で、図１に示す実施例１に粉体燃料物供給装置を設置した実施例である。図４において、溶融炉１の炉頂から排出される可燃性ダストは、可燃性ダスト捕集装置（サイクロン）５で捕集し、可燃性ダスト貯蔵タンク６に貯蔵され、可燃性ダスト切り出し装置７で切り出されて、酸素富化空気を供給する羽口２０から炉内へ吹き込まれ、また着火用燃料が供給される。本実施例では、粉体燃料供給装置２７を設置してバイオマス燃料、鉄粉、シュレッダーダスト、製鉄ダスト、破砕した廃プラスチック、廃タイヤ粉を貯蔵し、可燃性ダスト切り出し装置２８で切り出して、サイクロン５で捕集した可燃性ダストに加えて、あるいは単独、あるいは混合して吹き込むことも可能であり、それにより、さらなるコークス使用低減が可能となる。これらの可燃性ダストの粒径は５ｍｍ以下とすると、装置内での詰まりもなく、また、炉内での燃焼も良好となる。これらの可燃性ダストを炉内に吹き込むことによっても、燃料中の炭素や、鉄が燃焼し、その燃焼熱により、コークス使用量が低減できる。   FIG. 4 is an explanatory view of a shaft furnace type waste melting facility according to another embodiment of the present invention, which is an embodiment in which a pulverized fuel supply device is installed in the embodiment 1 shown in FIG. In FIG. 4, the combustible dust discharged | emitted from the furnace top of the melting furnace 1 is collected with the combustible dust collection apparatus (cyclone) 5, is stored in the combustible dust storage tank 6, and is combustible dust cut-out apparatus 7 And is blown into the furnace through the tuyere 20 for supplying oxygen-enriched air, and an ignition fuel is supplied. In the present embodiment, a pulverized fuel supply device 27 is installed to store biomass fuel, iron powder, shredder dust, iron making dust, crushed waste plastic, and waste tire powder, cut out by the combustible dust cutting device 28, and cyclone. In addition to the combustible dust collected in step 5, it is possible to blow alone or in a mixed manner, thereby further reducing the use of coke. If the particle size of these combustible dusts is 5 mm or less, there will be no clogging in the apparatus, and combustion in the furnace will be good. Even when these combustible dusts are blown into the furnace, carbon and iron in the fuel are combusted, and the amount of coke used can be reduced by the heat of combustion.

図５は本発明の別実施例のシャフト炉型の廃棄物溶融設備の説明図である。本実施例は、可燃性ダストと酸素富化空気、着火用燃料、着火用燃料燃焼用の酸素を羽口２０に供給するそれぞれの供給ラインに、逆止弁２９と自動で作動する窒素パージシステム３０を配設したものである、なお、３１は遮断弁、３２は流量制御弁である。   FIG. 5 is an explanatory view of a shaft furnace type waste melting facility according to another embodiment of the present invention. This embodiment is a nitrogen purge system that automatically operates with a check valve 29 in each supply line that supplies combustible dust and oxygen-enriched air, ignition fuel, and oxygen for combustion of combustion fuel to the tuyere 20. 30 is provided, 31 is a shut-off valve, and 32 is a flow control valve.

本発明のシャフト炉型の廃棄物溶融設備の説明図である。It is explanatory drawing of the shaft furnace type waste melting equipment of this invention. 本発明の羽口構造を示す概略図である。It is the schematic which shows the tuyere structure of this invention. 本発明の羽口構造のその他の実施例を示す概略図である。It is the schematic which shows the other Example of the tuyere structure of this invention. 本発明の別実施例のシャフト炉型の廃棄物溶融設備の説明図である。It is explanatory drawing of the shaft furnace type waste melting equipment of another Example of this invention. 本発明の別実施例のシャフト炉型の廃棄物溶融設備の説明図である。It is explanatory drawing of the shaft furnace type waste melting equipment of another Example of this invention. 従来のシャフト炉型の廃棄物溶融設備の説明図である。It is explanatory drawing of the conventional shaft furnace type waste melting equipment.

符号の説明Explanation of symbols

１：廃棄物溶融炉
２：装入装置
３：出滓口
４：羽口
５：可燃性ダスト捕集装置（サイクロン）
６：可燃性ダスト貯蔵タンク
７：可燃性ダスト切り出し装置
８：燃焼室
９：ボイラー
１０：蒸気タービン・発電装置
１１：集じん装置
１２：ブロワ
１３：煙突
２０：羽口
２１：羽口本体の先端部
２２：内筒
２３：中間筒
２４：外筒
２５：着火室
２６：看火用燃料燃焼空間
２７：粉体燃料供給装置
２８：可燃性ダスト切り出し装置
２９：逆止弁
３０：窒素パージシステム
３１：遮断弁
３２：流量制御弁 1: Waste melting furnace 2: Loading device 3: Outlet 4: Tuyere 5: Combustible dust collector (cyclone)
6: Combustible dust storage tank 7: Combustible dust cutting device 8: Combustion chamber 9: Boiler 10: Steam turbine / power generation device 11: Dust collector 12: Blower 13: Chimney 20: Tuyere 21: Tip of tuyere body Part 22: Inner cylinder 23: Intermediate cylinder 24: Outer cylinder 25: Ignition chamber 26: Fuel combustion space for igniting 27: Powdered fuel supply device 28: Combustible dust cutting device 29: Check valve 30: Nitrogen purge system 31 : Shut-off valve 32: Flow control valve

Claims (9)

炉内に廃棄物をコークス、石灰石と共に装入し、炉体に設けられている羽口から空気又は酸素富化空気を吹き込み、廃棄物を乾燥、熱分解、燃焼、溶融して廃棄物を処理する廃棄物溶融炉において、前記羽口を、粒径が５ｍｍ以下の可燃性ダストと空気又は酸素富化空気を供給する内筒、可燃性ダストの着火用燃料を供給する中間筒、及び着火用燃料燃焼用の酸素を供給する外筒の三重管構造とし、かつ、可燃性ダストと空気又は酸素富化空気を供給する内筒及び可燃性ダストの着火用燃料を供給する中間筒の先端部を、羽口本体筒の先端部から３０〜１００ｍｍ奥に位置させ、着火用燃料を着火して火炎を噴出させて高温の雰囲気を形成することを特徴とする廃棄物溶融炉の羽口構造。   Waste is charged into the furnace together with coke and limestone, air or oxygen-enriched air is blown from the tuyeres provided in the furnace body, and the waste is dried, pyrolyzed, burned and melted to treat the waste. In the waste melting furnace, the tuyere has an inner cylinder for supplying combustible dust having a particle size of 5 mm or less and air or oxygen-enriched air, an intermediate cylinder for supplying an ignition fuel for the combustible dust, and an ignition cylinder. It has a triple tube structure of an outer cylinder that supplies oxygen for fuel combustion, and an inner cylinder that supplies combustible dust and air or oxygen-enriched air, and an end of an intermediate cylinder that supplies fuel for igniting combustible dust. A tuyere structure for a waste melting furnace, which is positioned 30 to 100 mm deep from the tip of the tuyere main body, ignites an ignition fuel, and emits a flame to form a high temperature atmosphere. 各筒の先端部と、羽口先端部との間に、着火室を形成したことを特徴とする請求項１記載の廃棄物溶融炉の羽口構造。   2. A tuyere structure for a waste melting furnace according to claim 1, wherein an ignition chamber is formed between the tip of each tube and the tip of the tuyere. 着火室の内部に耐火物もしくはセラミックス製バーナータイルを設置したことを特徴とする請求項２記載の廃棄物溶融炉の羽口構造。   The tuyeres structure of a waste melting furnace according to claim 2, wherein a refractory or ceramic burner tile is installed inside the ignition chamber. 可燃性ダストの着火用燃料と着火用燃料燃焼用酸素の流速比（着火用燃料の流速／着火用燃料燃焼用酸素の流速）が０．２〜５．０の範囲となるように、各流体の吐出面積を調整することを特徴とする請求項１または２記載の廃棄物溶融炉の羽口構造。   Each fluid so that the flow rate ratio (ignition fuel flow rate / ignition fuel combustion oxygen flow rate) of combustible dust ignition fuel and ignition fuel combustion oxygen is in the range of 0.2 to 5.0. The discharge area of the waste melting furnace according to claim 1 or 2, wherein the discharge area of the waste melting furnace is adjusted. 可燃性ダストの着火用燃料及び着火用燃料燃焼用酸素の吐出流速が、１０〜５０ｍ／ｓとなるように、各流体の吐出面積を調整することを特徴とする請求項１〜３のいずれかに記載の廃棄物溶融炉の羽口構造。   The discharge area of each fluid is adjusted so that the discharge flow rate of the fuel for igniting combustible dust and oxygen for igniting fuel combustion is 10 to 50 m / s. The tuyere structure of the waste melting furnace described in 1. 廃棄物溶融炉に廃棄物をコークス、石灰石と共に装入し、羽口から空気又は酸素富化空気を吹き込み、廃棄物を乾燥、熱分解、燃焼、溶融して廃棄物を溶融処理する方法であって、可燃性ダストを羽口を介して炉内に吹き込む方法において、前記羽口を内筒、中間筒、及び外筒の三重管構造とし、粒径が５ｍｍ以下の可燃性ダストを空気又は酸素富化空気と共に内筒から、可燃性ダストの着火用燃料を中間筒から、前記着火用燃料を燃焼させる酸素を外筒からそれぞれ炉内に供給するとともに、可燃性ダストと空気又は酸素富化空気を供給する内筒及び可燃性ダストの着火用燃料を供給する中間筒の先端部を、羽口本体筒の先端部から３０〜１００ｍｍ奥に位置させ、着火用燃料を着火して火炎を噴出させることを特徴とする廃棄物溶融炉に可燃性ダストを吹き込む方法。   In this method, waste is charged into a waste melting furnace together with coke and limestone, air or oxygen-enriched air is blown from the tuyere, and the waste is dried, pyrolyzed, burned and melted to melt the waste. In the method in which combustible dust is blown into the furnace through the tuyere, the tuyere has a triple tube structure of an inner cylinder, an intermediate cylinder, and an outer cylinder, and combustible dust having a particle size of 5 mm or less is air or oxygen. Along with the enriched air, the combustible dust ignition fuel is supplied from the intermediate cylinder, oxygen for burning the ignition fuel is supplied from the outer cylinder to the furnace, and the combustible dust and air or oxygen-enriched air is supplied. The tip of the inner cylinder that supplies the fuel and the intermediate cylinder that supplies the fuel for igniting combustible dust are positioned 30 to 100 mm deep from the tip of the tuyere body cylinder, and the ignition fuel is ignited to emit a flame. In a waste melting furnace characterized by A method of blowing retardant dust. 内筒から可燃性ダストと酸素濃度２５〜４０％の酸素富化空気を吹き込むことを特徴とする請求項６記載の廃棄物溶融炉に可燃性ダストを吹き込む方法。   7. A method for injecting combustible dust into a waste melting furnace according to claim 6, wherein combustible dust and oxygen-enriched air having an oxygen concentration of 25 to 40% are injected from the inner cylinder. 廃棄物溶融炉に吹き込む可燃性ダストと可燃性ダストの着火用燃料及び廃棄物溶融炉に装入されるコークスの供給速度に対し、酸素比が０．９〜１．１の範囲となるように、下段羽口から吹き込む酸素の量を調整することを特徴とする請求項６または７記載の廃棄物溶融炉に可燃性ダストを吹き込む方法。   Combustible dust blown into the waste melting furnace, fuel for igniting the combustible dust, and coke supplied to the waste melting furnace so that the oxygen ratio is in the range of 0.9 to 1.1. The method of blowing combustible dust into a waste melting furnace according to claim 6 or 7, wherein the amount of oxygen blown from the lower tuyere is adjusted. 可燃性ダストが、廃棄物溶融炉の生成ガスから捕集した可燃性ダスト、バイオマス燃料、鉄粉、シュレッダーダスト、製鉄ダスト、破砕した廃プラスチック又は廃タイヤ粉の一種又は二種以上からなる可燃性ダストであることを特徴とする請求項６〜８のいずれかに記載の廃棄物溶融炉に可燃性物質を吹き込む方法。
Combustibility of combustible dust consisting of one or more of combustible dust, biomass fuel, iron powder, shredder dust, ironmaking dust, crushed waste plastic or waste tire powder collected from the gas generated from the waste melting furnace The method for blowing a combustible substance into the waste melting furnace according to any one of claims 6 to 8 , which is dust.
JP2004174243A 2003-08-19 2004-06-11 Tuna structure of waste melting furnace and method of blowing combustible dust Expired - Fee Related JP4477944B2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP2004174243A JP4477944B2 (en) 2003-08-19 2004-06-11 Tuna structure of waste melting furnace and method of blowing combustible dust
CN2004800433040A CN1997854B (en) 2004-06-11 2004-11-24 Tuyere structure of waste melting furnace and blowing method of combustible dust
EP04799883A EP1767856A1 (en) 2004-06-11 2004-11-24 Tuyere structure of waste fusion furnace and combustible dust blowing method
KR1020067025842A KR20070026568A (en) 2004-06-11 2004-11-24 Tuyere structure of waste fusion furnace and combustible dust blowing method
PCT/JP2004/017823 WO2005121646A1 (en) 2004-06-11 2004-11-24 Tuyere structure of waste fusion furnace and combustible dust blowing method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2003207938 2003-08-19
JP2004174243A JP4477944B2 (en) 2003-08-19 2004-06-11 Tuna structure of waste melting furnace and method of blowing combustible dust

Publications (2)

Publication Number Publication Date
JP2005098676A JP2005098676A (en) 2005-04-14
JP4477944B2 true JP4477944B2 (en) 2010-06-09

Family

ID=34466674

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2004174243A Expired - Fee Related JP4477944B2 (en) 2003-08-19 2004-06-11 Tuna structure of waste melting furnace and method of blowing combustible dust

Country Status (1)

Country Link
JP (1) JP4477944B2 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5281443B2 (en) * 2009-03-11 2013-09-04 新日鉄住金エンジニアリング株式会社 Method for injecting combustible dust into a waste melting furnace
CN102748761A (en) * 2011-04-22 2012-10-24 江苏腾明环保科技有限公司 Novel solid garbage incinerator
JP6018860B2 (en) * 2012-09-20 2016-11-02 新日鉄住金エンジニアリング株式会社 Waste gasification melting furnace startup method
JP6098804B2 (en) * 2013-03-27 2017-03-22 Ｊｆｅエンジニアリング株式会社 Mixed gas blowing device, waste gasification and melting furnace having the same, mixed gas blowing method, and waste gasification and melting method using the same
JP5974950B2 (en) * 2013-03-27 2016-08-23 Ｊｆｅエンジニアリング株式会社 Mixed gas blowing device, waste gasification and melting furnace having the same, mixed gas blowing method, and waste gasification and melting method using the same
JP6481961B2 (en) * 2015-03-24 2019-03-13 Ｊｆｅエンジニアリング株式会社 Waste gasification and melting apparatus and waste gasification and melting method
CN105090969A (en) * 2015-06-02 2015-11-25 黄传贤 Blast furnace type refuse incinerator
JP7243677B2 (en) * 2020-05-15 2023-03-22 Ｊｆｅスチール株式会社 Furnace bottom temperature raising method and blast furnace start-up method

Also Published As

Publication number Publication date
JP2005098676A (en) 2005-04-14

Similar Documents

Publication Publication Date Title
JP2002081624A (en) Waste gasification melting furnace and operation method of the melting furnace
JP5522325B1 (en) Blast furnace operation method
JP5617531B2 (en) Combustion method of low calorific value gas by combustion burner and blast furnace operation method
JP4477944B2 (en) Tuna structure of waste melting furnace and method of blowing combustible dust
JP5180917B2 (en) Waste melting treatment method and waste melting treatment apparatus
JP5392230B2 (en) Blast furnace gas combustion method with combustion burner
JP2006343002A (en) Dry distillation gasification furnace, light metal melting furnace and light metal melting equipment
JP5410694B2 (en) Combustible waste treatment equipment
JP6260555B2 (en) Reducing material blowing device
JP4720260B2 (en) Method and apparatus for injecting reducing material into blast furnace
JP6504370B2 (en) Method of producing molten iron by electric furnace
CN1997854B (en) Tuyere structure of waste melting furnace and blowing method of combustible dust
JP2007078197A (en) Incinerator and incinerating method of waste
JP5335062B2 (en) Combustion device
JP4377826B2 (en) Waste melting treatment method
JP4393977B2 (en) Burner structure for burning flame retardant carbon powder and its combustion method
JP3178663B2 (en) Operation method of coke dry fire extinguishing equipment
JP5611424B2 (en) Combustion device
JPS63267814A (en) Combustion method for pulverized coal
JP5981696B2 (en) Gasification melting equipment melting furnace
JP5392229B2 (en) Combustion method of low calorific value gas by combustion burner
CN112503514A (en) Composite combustion circulating fluidized bed
JP2004301494A (en) Waste melting process method

Legal Events

Date Code Title Description
A711 Notification of change in applicant

Free format text: JAPANESE INTERMEDIATE CODE: A712

Effective date: 20060804

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A821

Effective date: 20060817

RD02 Notification of acceptance of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7422

Effective date: 20060817

A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20061116

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20090213

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20090403

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20090925

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20091007

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: 20100212

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: 20100312

R150 Certificate of patent or registration of utility model

Ref document number: 4477944

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: 20130319

Year of fee payment: 3

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

Free format text: PAYMENT UNTIL: 20130319

Year of fee payment: 3

S533 Written request for registration of change of name

Free format text: JAPANESE INTERMEDIATE CODE: R313533

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

Free format text: PAYMENT UNTIL: 20130319

Year of fee payment: 3

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

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

Free format text: PAYMENT UNTIL: 20130319

Year of fee payment: 3

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

Free format text: PAYMENT UNTIL: 20140319

Year of fee payment: 4

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

S533 Written request for registration of change of name

Free format text: JAPANESE INTERMEDIATE CODE: R313533

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

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

LAPS Cancellation because of no payment of annual fees