JP2002539415A - Method and apparatus for reducing feedstock in a rotary hearth furnace - Google Patents
Method and apparatus for reducing feedstock in a rotary hearth furnaceInfo
- Publication number
- JP2002539415A JP2002539415A JP2000605147A JP2000605147A JP2002539415A JP 2002539415 A JP2002539415 A JP 2002539415A JP 2000605147 A JP2000605147 A JP 2000605147A JP 2000605147 A JP2000605147 A JP 2000605147A JP 2002539415 A JP2002539415 A JP 2002539415A
- Authority
- JP
- Japan
- Prior art keywords
- rotary hearth
- furnace
- zone
- hearth furnace
- feed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/10—Making spongy iron or liquid steel, by direct processes in hearth-type furnaces
- C21B13/105—Rotary hearth-type furnaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
- F27B9/16—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a circular or arcuate path
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/3005—Details, accessories, or equipment peculiar to furnaces of these types arrangements for circulating gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/40—Arrangements of controlling or monitoring devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/36—Arrangements of heating devices
- F27B2009/3607—Heaters located above the track of the charge
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/06—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated
- F27B9/062—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated electrically heated
- F27B9/066—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated electrically heated heated by lamps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D9/00—Cooling of furnaces or of charges therein
- F27D2009/0002—Cooling of furnaces
- F27D2009/001—Cooling of furnaces the cooling medium being a fluid other than a gas
- F27D2009/0013—Cooling of furnaces the cooling medium being a fluid other than a gas the fluid being water
- F27D2009/0016—Water-spray
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D99/00—Subject matter not provided for in other groups of this subclass
- F27D99/0001—Heating elements or systems
- F27D99/0033—Heating elements or systems using burners
- F27D2099/0046—Heating elements or systems using burners with incomplete combustion, e.g. reducing atmosphere
- F27D2099/0048—Post- combustion
-
- 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
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/134—Reduction of greenhouse gas [GHG] emissions by avoiding CO2, e.g. using hydrogen
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Organic Chemistry (AREA)
- Tunnel Furnaces (AREA)
- Manufacture Of Iron (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Furnace Details (AREA)
- Incineration Of Waste (AREA)
Abstract
(57)【要約】 供給材料を還元する回転炉床炉１０を提供する。この回転炉床炉１０は、囲い内に配置され回転運動するように取付けた回転炉床１２を備える。前記囲いは環状の内壁１６、環状の外壁１４及び頂部１８を持つ。この囲いは、回転炉床１２に密封され、少なくとも装入区域２８、処理区域２４及び放出区域２２を含む複数の区域に分割される。回転炉床炉１０はさらに、少なくとも囲いの外壁１４に位置し、回転炉床炉１０内に制御した温度を生ずるようにした複数個のバーナ２０と、回転炉床炉１０の還元区域内に予熱区域２６及び放出区域２２の間に位置し各バーナ２０からの燃焼ガスと供給材料の処理から生ずるガスとを排出する炉筒３０とを備える。この炉筒３０は未燃焼粒子の燃焼及び沈降用の空間を含む。噴水冷却装置は炉廃ガスの温度を下げ、空気又は酸素の導入による逐次の燃焼によって多量の酸化窒素が生じないようにする。 (57) [Summary] A rotary hearth furnace 10 for reducing a feed material is provided. The rotary hearth furnace 10 includes a rotary hearth 12 disposed in an enclosure and mounted for rotational movement. The enclosure has an annular inner wall 16, an annular outer wall 14 and a top 18. The enclosure is sealed to the rotary hearth 12 and divided into a plurality of zones including at least a charging zone 28, a processing zone 24 and a discharge zone 22. The rotary hearth furnace 10 further includes a plurality of burners 20 located at least on the outer wall 14 of the enclosure to produce a controlled temperature within the rotary hearth furnace 10 and a preheater within the reduction zone of the rotary hearth furnace 10. A furnace tube 30 is located between the zone 26 and the discharge zone 22 for exhausting combustion gases from each burner 20 and gases resulting from processing of the feedstock. The furnace tube 30 includes a space for burning and settling of unburned particles. The fountain cooler lowers the temperature of the furnace off-gas so that successive combustions with the introduction of air or oxygen do not produce large amounts of nitric oxide.
Description
【０００１】[0001]
本発明は、回転炉床炉（ｒｏｔａｒｙ ｈｅａｒｔｈ ｆｕｒｎａｃｅ）と、
回転炉床炉内の供給材料を還元する（ｒｅｄｕｃｅ）方法とに関する。ことに本
発明は、改良された炉筒システムを持つ回転炉床炉と、回転炉床炉内の供給材料
を還元する方法とに関する。The present invention provides a rotary hearth furnace,
A method for reducing feedstock in a rotary hearth furnace. More particularly, the present invention relates to a rotary hearth furnace with an improved hearth furnace system and a method for reducing feedstock in a rotary hearth furnace.
【０００２】[0002]
典型的な回転炉床炉は、環状の耐火内壁と環状の耐火外壁とこれ等の内壁及び
外壁間に配置した環状の炉床とを備える。炉床はその周辺のまわりのローラ配列
に可動なように支えてある。内壁及び上壁の間で炉床の上方に固定頂部を配置し
てある。複数個のバーナは、内壁及び／又は外壁に沿って位置させ固定の頂部内
の回転炉床の上方の環状空間内に火炎を吹出し、典型的には、種種の区域たとえ
ば装入区域、処理区域及び放出区域を経て回転炉床で運ぶ供給材料を加熱する。A typical rotary hearth furnace includes an annular refractory inner wall, an annular refractory outer wall, and an annular hearth disposed between the inner and outer walls. The hearth is movably supported by an array of rollers about its periphery. A fixed top is located above the hearth between the inner and upper walls. The plurality of burners blow the flame into an annular space above the rotary hearth in a fixed top located along the inner and / or outer walls, typically in various zones, such as a charging zone, a processing zone. And heating the feed material carried on the rotary hearth through the discharge zone.
【０００３】 作動時には、加熱しようとする供給材料は、装入区域内で炉床に直接乗せ次い
で処理区域を経て運ぶ。この場合供給材料を炉床径路のまわりに運ぶ際に放射熱
及び処理ガスを加え化学反応を生じさせる。処理した供給材料は次いで放出区域
で回転炉床から取出す。[0003] In operation, the feed to be heated is placed directly on the hearth in the charging zone and then transported through the processing zone. In this case, the radiant heat and the processing gas are added when the feed material is transported around the hearth path to cause a chemical reaction. The treated feed is then removed from the rotary hearth at the discharge zone.
【０００４】 この説明に全文を参照した米国特許第４，５９７，５６４号及び同第４，６２
２，９０５号の各明細書に示してあるような回転炉床炉では回転炉床炉で生ずる
ガスは、この回転炉床炉の装入区域に隣接し放出区域から離れて位置させた炉筒
から排出される。この炉筒は、回転炉床炉の装入区域に隣接し放出区域から離れ
て位置し、放出区域から装入区域にガスを吸引する対向流方式を生成する。すな
わち加熱しようとする供給材料に対する露出時間が最大になるように流出流れが
炉床の回転方向に対し反対の向きになる。この炉筒システムは満足の得られる性
能を持つが、典型的な対向流形回転炉床炉で放出区域の付近で生ずるガスは水封
トンネルを通る所期のガス流を短絡し炉筒に直接流れることにより、処理区域及
び装入区域を通らないことが知られている。さらに又、炉筒を装入区域又は放出
区域に隣接して又はその近くに位置させるときは、装入区域及び放出区域で差動
圧力が生じ炉ガスが回転炉床炉から装入区域及び放出区域を経て逃げるようにな
るのは明らかである。[0004] US Patent Nos. 4,597,564 and 4,62, the entire contents of which are hereby incorporated by reference.
In rotary hearth furnaces such as those shown in the specification of US Pat. No. 2,905, the gas generated in the rotary hearth furnace is supplied to a furnace tube located adjacent to the charging area of the rotary hearth furnace and away from the discharge area. Is discharged from The furnace tube is located adjacent to and away from the discharge area of the rotary hearth furnace and creates a counter-flow system that draws gas from the discharge area into the charge area. That is, the outflow is in the opposite direction to the direction of rotation of the hearth so that the exposure time to the feed to be heated is maximized. While this furnace system has satisfactory performance, the gas generated near the discharge zone in a typical counter-flow rotary hearth furnace shorts the desired gas flow through a water ring tunnel and directly into the furnace tube. It is known that the flow does not pass through the processing and loading areas. Furthermore, when the furnace tube is located adjacent to or near the charging or discharging area, differential pressures occur in the charging and discharging areas and furnace gas is transferred from the rotating hearth furnace to the charging and discharging areas. Obviously it will escape through the area.
【０００５】 さらに鉄プロセスの直接還元（ｄｉｒｅｃｔ ｒｅｄｕｃｔｉｏｎ ｏｆ ｉ
ｒｏｎ ｐｒｏｃｅｓｓ）では炉の最後の区域内の高いＣＯ／ＣＯ２比は直接還
元鉄（ＤＲＩ）の戻り酸化を防ぐのに必要である。高いＣＯ／ＣＯ２比を保持す
るにはバーナを比較的低い空気対燃料比（６．２ないし１以下）で操作しなけれ
ばならないのは明らかである。これ等の低い空気対燃料比は、認められないほど
低い有効熱価すなわち６．１２の空気／燃料比における天然ガスの８４．５ＢＴ
Ｕ／ｆｔ３となり、これは高い燃料利用値になる。有効熱の問題を改良するのに
３つの対案が利用できる。第１は燃焼空気を予熱するのに炉排出ガスからエネル
ギーを回収することであり、第２は燃焼空気の若干又は全部の代りに酸素を使う
ことであり、第３は予熱した燃焼空気を環境酸素と混合することである。表１に
は、有効熱と生成直接還元鉄（ＤＲＩ）ｌｂ当たり消費される天然ガスｌｂとに
対し燃焼空気及び環境酸素を予熱することの効果を要約してある。[0005] Furthermore, direct reduction of the iron process
ron process) in high CO / CO 2 ratio of the last zone of the furnace is necessary to prevent the return oxidation of direct reduced iron (DRI). Obviously, to maintain a high CO / CO 2 ratio, the burner must be operated at a relatively low air to fuel ratio (6.2 to 1 or less). These low air-to-fuel ratios result in an unacceptably low effective heat value, ie, 84.5 BT of natural gas at an air / fuel ratio of 6.12.
U / ft 3 which is a high fuel utilization value. Three alternatives are available to improve the effective heat problem. The first is to recover energy from the furnace exhaust gas to preheat the combustion air, the second is to use oxygen instead of some or all of the combustion air, and the third is to use the preheated combustion air in the environment. Mixing with oxygen. Table 1 summarizes the effect of preheating combustion air and environmental oxygen on available heat and lb of natural gas consumed per lb of produced direct reduced iron (DRI).
【０００６】[0006]
【表１】 [Table 1]
【０００７】 以上述べた所から明らかなように従来の問題に対向する改良された回転炉床炉
の必要性は極めて高い。本発明の目的は、改良された処理ガス流れを生ずる回転
炉床炉を提供することにある。本発明の他の目的は、処理ガスが炉装入区域及び
／又は放出区域を経て処理区域を処理ガスが短絡しないようにする回転炉床炉を
提供することにある。本発明の他の目的は、利用エネルギーを有効に利用して回
転炉床炉内部の供給材料を還元する回転炉床炉を提供することにある。本発明の
なお他の目的は放出装置の寸法を減らすように回転炉床炉炉筒から出る煙突ガス
の量を有効に減らす回転炉床炉を提供することにある。本発明の他の目的は、供
給装置のみぞ穴を経て供給材料の準備に使う有機質又は炭質の結合剤から生ずる
潜在的に有毒の蒸気の発生をなくす、装入区域からの通風作用を提供することに
ある。このようにして処理ガスを空気からの酸素と混合し燃焼させることにより
炉の予熱区域内の熱を放出できるのは明らかである。本発明のなお他の目的は、
作るのが簡単で経済的な回転炉床炉を提供することにある。[0007] As can be seen from the foregoing, there is a great need for an improved rotary hearth furnace that addresses the conventional problems. It is an object of the present invention to provide a rotary hearth furnace that produces an improved process gas flow. It is another object of the present invention to provide a rotary hearth furnace in which the processing gas is prevented from short-circuiting the processing area via the furnace charging area and / or the discharging area. Another object of the present invention is to provide a rotary hearth furnace that effectively utilizes the energy used to reduce feedstock inside the rotary hearth furnace. It is still another object of the present invention to provide a rotary hearth furnace that effectively reduces the amount of chimney gas exiting the rotary hearth furnace tube so as to reduce the size of the discharger. Another object of the present invention is to provide ventilation from the charging area which eliminates the generation of potentially toxic vapors from organic or carbonaceous binders used in the preparation of the feedstock through the feeder slot. It is in. Obviously, the heat in the preheating zone of the furnace can be released by mixing and burning the process gas with oxygen from the air. Yet another object of the invention is to provide
It is to provide a rotary hearth furnace which is simple and economical to make.
【０００８】 要するに本発明によれば供給材料を還元する回転炉床炉が得られる。回転炉床
炉は、耐火内張りの囲い内に配置され回転運動するように取付けた回転炉床を備
える。この囲いは、環状の内壁、環状の外壁及び頂部を備える。この囲いは、炉
床に作動的に密封され、少なくとも装入区域、予熱区域、処理区域及び放出区域
を含む複数の区域に分割してある。この回転炉床炉はさらに、このファーネス内
に制御した温度を生ずるように囲いの少なくとも外壁に位置させた複数個のバー
ナと、これ等のバーナからの燃焼ガスと供給材料の処理によって生ずる処理ガス
とを排出するようにファーネスの予熱区域及び処理区域の間に位置させた炉筒と
を備える。In short, the present invention provides a rotary hearth furnace for reducing feedstock. The rotary hearth furnace includes a rotary hearth disposed within a refractory lined enclosure and mounted for rotational movement. The enclosure has an annular inner wall, an annular outer wall and a top. The enclosure is operatively sealed to the hearth and is divided into a plurality of zones including at least a charging zone, a preheating zone, a processing zone and a discharge zone. The rotary hearth furnace further includes a plurality of burners located on at least the outer wall of the enclosure to produce a controlled temperature within the furnace, and a process gas generated from processing of combustion gases and feedstock from the burners. And a furnace tube located between the preheating zone and the processing zone of the furnace to discharge the furnace.
【０００９】 本発明の特徴、その他の目的及び利点を添付図面による以下の詳細な説明によ
って述べる。[0009] The features, other objects and advantages of the present invention will be described by the following detailed description with reference to the accompanying drawings.
【００１０】[0010]
添付図面では同様な部品を表わすのに同様な参照数字が使われ回転炉床炉１０
を示してある。分かりやすいように回転炉床炉１０の構造の若干の詳細はこれ等
の部分が普通のもので当業者には明らかであるから本説明では省くことにする。
たとえばガス状物質及び粒状固体物質の取扱いに必要なバーナ、ブロワ、配管及
びダクト加工品等は任意のこのような公知の工業用部品でよいが、このような部
品は本発明の全システムに使えるように当業者の必要に応じ変型を行ってもよい
。本説明では、１９８４年米国ニューヨーク市のマグロウ・ヒル社刊行のケミカ
ル・エンジニアズ・ハンドブック第７版と、１９８２年ジョン・ウィリィ・エン
ド・サンズ（Ｊｏｈｎ Ｗｉｌｅｙ ＆ Ｓｏｎｓ）社刊行のケリー（Ｋｅｌｌ
ｙ）Ｅ．，Ｇ．，を著者とするミネラル・プロセシング（Ｍｉｎｅｒａｌ Ｐｒ
ｏｃｅｓｓｉｎｇ）への手引き（Ｉｎｔｒｏｄｕｃｔｉｏｎ）と、一般に種種の
装置と処理構造及び処理条件との詳細な説明のための化学技術工業文献とを参照
する。In the drawings, like reference numerals are used to designate like parts, and the rotary hearth furnace 10
Is shown. For clarity, some details of the structure of rotary hearth furnace 10 will be omitted in this description because these parts are conventional and will be apparent to those skilled in the art.
For example, the burners, blowers, plumbing and ductwork required for handling gaseous and particulate solid materials may be any such known industrial components, but such components can be used in the entire system of the present invention. As such, modifications may be made as needed by those skilled in the art. This description includes the seventh edition of the Chemical Engineers Handbook, published by McGraw-Hill, New York, 1984, and Kell, published by John Wiley & Sons, 1982.
y) E.I. , G .; , Mineral Processing (Minal Pr)
Reference is made to the Introduction to Chemical Processing and the Chemical Engineering Industry Literature for a detailed description of various equipment and processing structures and conditions in general.
【００１１】 添付図面には中心のまわりに逆時計回りに回転運動するように取付けた炉床１
２を備えた回転炉床炉１０を示してある。炉床１２は、ドーナツ形囲い内に配置
され当業界にはよく知られているように周辺のまわりのローラ配列に支えてある
。この囲いは内側の環状の側壁１６及び外側の環状の側壁１４を備える。各環状
の側壁１４、１６は上下方向に配置され当業界にはよく知られているような耐火
材料から作ってある。環状の側壁１６及び環状の側壁１４の間にこれ等の側壁の
最上端部を互いに連結する固定の頂部（ｓｔａｔｉｏｎａｒｙ ｒｏｏｆ）１８
を位置させてある。囲いはよく知られているように水封部（図示してない）によ
り炉床１２に作動的に密封してある。FIG. 1 shows a hearth 1 mounted so as to rotate counterclockwise around its center.
2 shows a rotary hearth furnace 10 equipped with a rotary hearth furnace 2. The hearth 12 is located within a donut-shaped enclosure and is supported by an array of rollers around its periphery, as is well known in the art. The enclosure has an inner annular sidewall 16 and an outer annular sidewall 14. Each annular side wall 14, 16 is arranged vertically and is made of a refractory material as is well known in the art. Stationary roofs 18 connecting the uppermost ends of these side walls between the annular side walls 16 and 14.
Is located. The enclosure is operatively sealed to the hearth 12 by a water seal (not shown) as is well known.
【００１２】 普通の構造を持つ適当なバーナ２０は囲いの上下方向の外側の側壁１４及び／
又は内側の側壁１６内に位置させてある。各バーナ２０は、油、徴粉炭及び／又
はガスのような適当な燃料を供給され空気で燃焼する。各バーナ２０は作動的に
着火され供給材料を還元するように回転炉床炉１０内に制御した温度を生ずる。
石炭揮発性成分を含み放出する供給材料を処理するときは、炉囲い内に通常存在
する可燃ガスを燃焼させるために、選定したバーナを空気入口として利用する。
さらに述べるように処理区域の最終コードラント内の強い還元性ガスで作動する
ときは可燃ガスを部分的に燃焼させるのに選定したバーナ内に空気だけを導入す
る。A suitable burner 20 having a conventional construction is the upper and lower outer side walls 14 of the enclosure and / or
Alternatively, it is located in the inner side wall 16. Each burner 20 is supplied with a suitable fuel, such as oil, lignite and / or gas, and burns with air. Each burner 20 is operatively ignited to produce a controlled temperature within the rotary hearth furnace 10 to reduce feedstock.
When processing feedstocks containing and releasing volatile components of coal, selected burners are used as air inlets to combust the combustible gases normally present in the furnace enclosure.
As will be further described, when operating with strong reducing gases in the final cordrant of the treatment zone, only air is introduced into the burner selected to partially combust the combustible gases.
【００１３】 回転炉床炉１０は、典型的には少なくとも装入区域（ｌｏａｄｉｎｇ ｚｏ
ｎｅ）２８、予熱区域（ｐｒｅｈｅａｔ ｚｏｎｅ）２６、処理区域（ｐｒｏｃ
ｅｓｓ ｚｏｎｅ）２４及び放出区域（ｄｉｓｃｈａｒｇｅ ｚｏｎｅ）２２を
含む複数の区域に分割する。各区域は障壁カーテン（図示してない）により隣接
区域から隔離してある。障壁カーテンは、当業界にはよく知られているように各
区域内の高い温度と腐食性ふん囲気とに耐えるのに適した合金又はセラミック材
の繊維から構成してある。この説明で使われる「区域（ｚｏｎｅ）」という用語
は、生じている主要な活動、たとえば装入、予熱、処理及び放出等の活動が他の
炉区間に生じている主要な活動とは異なる、回転炉床炉の各別の人工区間（ａｒ
ｔｉｆｉｃｉａｌ ｓｅｃｔｉｏｎ）のことである。各区域は、さらに逐次のコ
ードラント（ｓｅｑｕｅｎｔｉａｌ ｑｕａｄｒａｎｔ）に再分割される。この
場合「コードラント」（ｑｕａｄｒａｎｔ）という用語は炉の各区域（ｚｏｎｅ
）の各別の区間（ｓｅｃｔｉｏｎ）のことである。図示のように各コードラント
は互いに等しい寸法を持つ。The rotary hearth furnace 10 typically has at least a loading ZO
ne) 28, preheat zone 26, treatment zone (proc
It is divided into a plurality of zones, including an ess zone 24 and a discharge zone 22. Each area is separated from adjacent areas by a barrier curtain (not shown). Barrier curtains are constructed from fibers of an alloy or ceramic material suitable to withstand the high temperatures and corrosive atmospheres in each zone, as is well known in the art. As used in this description, the term "zone" is intended to mean that the primary activity occurring, such as charging, preheating, treatment and discharge, is different from the primary activity occurring in other furnace sections, Each artificial section of the rotary hearth furnace (ar
physical section). Each zone is further subdivided into sequential quadrants. In this case, the term "quadrant" is used to refer to each zone of the furnace.
) Is a separate section. As shown, each cordrant has equal dimensions.
【００１４】 装入区域２８では還元しようとする供給材料は回転炉床炉１０の回転炉床１２
に配分する。供給材料は、加熱により還元しようとする又は制御したふん囲気内
の処理ガスに露出しようとする任意適当な材料でよい。供給材料は、石炭材料、
石炭材料含有混合物、石油コークス及び石油コークス含有混合物のような炭素質
物質を含む。供給材料は、バージン（ｖｉｒｇｉｎ）すなわち未処理の酸化金属
精鉱（ｍｅｔａｌ ｏｘｉｄ ｃｏｎｃｅｎｔｒａｔｅｓ）及び天然鉱石細粒（
ｎａｔｕｒａｌ ｏｒｅ ｆｉｎｅｓ）たとえば赤鉄鉱、褐鉄鉱、磁鉄鉱タコナ
イト（ｔａｃｏｎｉｔｅ）、菱鉄鉱、黄鉄鉱及びクロム鉄鉱と、及び又は正常な
金属製造作業の結果として収集される金属処理ミル廃棄物（ｍｅｔａｌ ｐｒｏ
ｃｅｓｓｉｎｇ ｍｉｌｌ ｗａｓｔｅ）、アーク炉粉じん（ｅｌｅｃｔｒｉｃ
ａｒｃ ｆｕｒｎａｃｅ ｄｕｓｔ）と圧延機スケール（ｒｏｌｌｉｎｇ ｍ
ｉｌｌ ｓｃａｌｅ）と又はこれ等の類似物又はこれ等の混合物とを含んでもよ
い。供給材料は石炭材料又は石炭材料含有混合物等のような揮発性成分を含み、
或は供給材料はコークス材料のような揮発性成分を含まなくてもよい。供給材料
はとくに、当業界にはよく知られた簡潔な形状又はペレット形状のものでよい。In the charging zone 28, the feed to be reduced is supplied to the rotary hearth 12 of the rotary hearth furnace 10.
Distribute to The feed material can be any suitable material that is to be reduced by heating or exposed to process gas in a controlled atmosphere. The supply materials are coal materials,
Carbonaceous materials such as coal material containing mixtures, petroleum coke and petroleum coke containing mixtures. The feed materials are virgin, ie, untreated metal oxide concentrates and natural ore fines (
natural or fines such as hematite, limonite, magnetite taconite, siderite, pyrite and chromite, and / or metal treated mill waste collected as a result of normal metal making operations.
cessing mill waste, electric arc furnace dust (electric)
arc furnish dust and rolling mill scale (rolling m)
ill scale) and / or their analogs or mixtures thereof. The feedstock contains volatile components such as coal material or a mixture containing coal material,
Alternatively, the feed may be free of volatile components such as coke materials. The feed material may be in particular in a simple or pellet form well known in the art.
【００１５】 供給材料は、電気式振動送り装置（ｅｌｅｃｔｒｉｃ ｖｉｂｒａｔｏｒｙ
ｆｅｅｄｅｒ）又は輪郭形成星形車（ｐｒｏｆｉｅｌｄ ｓｔａｒ
ｗｈｅｅｌ）のような普通の送り装置により回転炉床炉１０の炉床１２に均等
に配分されるのがよい。この送り装置は、炉の外側壁１４を貫いて炉床の表面の
上方に適当な距離だけ延びる。好適な実施例では供給材料は回転炉床１２に直接
一般に一重の層を深く乗せ供給材料の均等な処理が容易になり高度に露出した又
あまり露出してない各供給材料の間の反応度の違いを防ぐようにしてある。[0015] The feed material is an electric vibratory feeder (electric vibratory).
feeder or profiled star
It may be distributed evenly to the hearth 12 of the rotary hearth furnace 10 by a conventional feeder such as a wheel. This feeder extends a suitable distance above the surface of the hearth through the outer wall 14 of the furnace. In the preferred embodiment, the feedstock is generally directly overlaid on the rotary hearth 12 with a single layer deep to facilitate uniform treatment of the feedstock and to provide a highly exposed or less exposed reactant between each of the feedstocks. I try to prevent the difference.
【００１６】 供給材料を装入区域２８内に装入した後、この供給材料は囲い内で炉床径路に
沿い予熱区域２６に次いで処理区域２４に移送する。予熱区域２６は処理区域２
４より低い温度すなわち１８００°Ｆ及び２２００°Ｆ対２３００°Ｆ及び２６
００°Ｆで作動し、通常供給材料の破砕を招く好ましくない熱的過渡条件が最低
になるようにする。図１に示すように予熱区域２６は装入区域２８の下流側端部
から処理区域２４の入口領域に延びる。After charging the feed into the charging zone 28, the feed is transferred along the hearth path in the enclosure to the preheating zone 26 and then to the processing zone 24. Preheating area 26 is processing area 2
Temperatures below 4 ie 1800 ° F and 2200 ° F versus 2300 ° F and 26
Operate at 00 ° F. to minimize undesired thermal transients that would normally result in feed fragmentation. As shown in FIG. 1, the preheating section 26 extends from the downstream end of the charging section 28 to the inlet area of the processing section 24.
【００１７】 処理区域２４はさらに３つの次次の互いに隣接するコードラント１、２、３に
再分割する。各コードラントは入口領域（ｅｎｔｒｙ ａｒｅａ）及び出口領域
（ｅｘｉｔ ａｒｅａ）を備える。コードラント１は予熱区域２６の下流側端部
からコードラント２の上流側入口領域に延び、コードラント２はコードラント１
の出口領域からコードラント３の入口領域に延び、コードラント３はコードラン
ト２の出口領域から放出区域２２の上流側端部に延びる。The processing zone 24 is further subdivided into three next adjacent coderants 1, 2, 3. Each cordrant has an entry area and an exit area. The corundant 1 extends from the downstream end of the preheating section 26 to the upstream inlet area of the corundant 2, and the corundant 2
From the outlet area of the cordant 3 to the inlet area of the cordant 3, which extends from the outlet area of the cordrant 2 to the upstream end of the discharge area 22.
【００１８】 予熱区域２６では、主要な燃料源として供給材料から放出される揮発性有機物
質を燃焼させるのに十分な空気対燃料比で１８００°Ｆないし２２００°Ｆの間
の所望の区域温度が得られるようにバーナ２０を着火する。処理区域２４では、
２３００°Ｆないし２６００°Ｆと大気温度との間で供給材料が還元されるよう
になる所望の炉温度が得られるようにバーナ２０を着火する。供給材料は、この
供給材料にバーナ２０から燃焼ガスの放射熱及び作用を加え又供給材料に従って
炉床径路のまわりの移動中に供給材料の処理によって生ずる処理ガスを加えるこ
とにより還元する。又この炉の処理区域２４には必要に応じて空気を導入し燃焼
工程からの過剰な一酸化炭素及び水素と共に燃焼させ二酸化炭素及び水蒸気を生
成し処理区域２４における供給材料の処理のために所望の炉床温度を保持するよ
うに熱を放出する。In the preheat zone 26, the desired zone temperature between 1800 ° F. and 2200 ° F. with an air to fuel ratio sufficient to burn the volatile organics emitted from the feed as the primary fuel source is provided. The burner 20 is ignited to obtain it. In processing area 24,
The burner 20 is ignited to achieve the desired furnace temperature at which the feed is reduced between 2300 ° F. and 2600 ° F. and ambient temperature. The feedstock is reduced by adding radiant heat and action of the combustion gases from the burner 20 to the feedstock and by adding processing gas resulting from processing of the feedstock during its movement around the hearth path in accordance with the feedstock. Also, air is introduced into the processing zone 24 of the furnace as needed to combust with excess carbon monoxide and hydrogen from the combustion process to produce carbon dioxide and water vapor, which is desirable for processing the feedstock in the processing zone 24. The heat is released so as to maintain the hearth temperature.
【００１９】 処理区域２４で供給材料を還元した後、還元供給材料は放出区域２２で回転炉
床から取出す。たとえば還元供給材料は、この炉床を横切って配置されこの炉床
の上方に間隔を隔てたつる巻きねじにより放出区域２２から放出する。還元供給
材料は次いで当業界にはよく知られているようにさらに処理するために均熱炉等
に放出する。After reducing the feed in the processing zone 24, the reduced feed is removed from the rotary hearth in the discharge zone 22. For example, the reduced feed is discharged from discharge area 22 by spaced helical screws positioned across the hearth and above the hearth. The reducing feed is then discharged to a soaking furnace or the like for further processing as is well known in the art.
【００２０】 １変型では回転炉床炉１０は又ウォーミング区域（ｗａｒｍｉｎｇ ｚｏｎｅ
）［図示してない］を備える。回転炉床炉１０のウォーミング区域は供給材料の
導入用の装入区域の直前に位置させる。供給材料を入れてない熱入れ区域は供給
材料の装入に先だって所望の温度に加熱する。供給材料の装入の直前に供給材料
を入れてない炉床の熱入れにより回転炉床炉の全上面の熱入れと引続き導入する
供給材料の頂部からの放射加熱と底部からの供給材料の伝導加熱及び放射加熱と
ができるのは明らかである。供給材料を入れてない回転炉床炉の１区域の専用熱
入れにより、ファーネス回転炉床への低温供給材料の連続装入により生ずる冷却
効果を受ける回転炉床炉とは異なって回転炉床炉により回転炉床を暖め一定の装
入区域温度が得られるのは明らかである。In a variant, the rotary hearth furnace 10 also has a warming zone.
) [Not shown]. The warming zone of the rotary hearth furnace 10 is located immediately before the charging zone for the introduction of the feed. The warming area without the feed is heated to the desired temperature prior to charging the feed. Heating of the hearth furnace without feed immediately before the charge of the feed, heating of the entire upper surface of the rotary hearth furnace and radiant heating from the top of the subsequently introduced feed and conduction of the feed from the bottom Obviously heating and radiant heating are possible. Due to the dedicated heating of one section of the rotary hearth furnace without feed material, the rotary hearth furnace differs from the rotary hearth furnace which receives the cooling effect caused by the continuous charging of the low temperature feed material to the furnace rotary hearth. It is evident that the heating of the rotary hearth provides a constant charging zone temperature.
【００２１】 回転炉床炉１０の頂部１８は、ファーネス１０の処理区域２４の領域内で予熱
区域２６及び放出区域２２間に位置させた炉筒３０を備える。炉筒３０を処理区
域２４内に位置させることにより、供給材料、処理ガス及び燃焼ガスは予熱区域
２６内を流れ燃焼空気からの酸素と混合して予熱区域２６内に解放熱を生じさせ
処理ガス及び燃焼ガスを放出区域２２から流動させ空気及び／又は酸素濃化空気
からの酸素と混合して燃焼させることにより又ファーネス１０内で熱を放出する
。The top 18 of the rotary hearth furnace 10 comprises a furnace tube 30 located between a preheating zone 26 and a discharge zone 22 in the region of the processing zone 24 of the furnace 10. By positioning the furnace tube 30 within the processing zone 24, the feedstock, processing gas and combustion gases flow within the preheating zone 26 and mix with oxygen from the combustion air to produce release heat within the preheating zone 26 to produce processing gas. Heat is also released within the furnace 10 by flowing and burning the combustion gases from the discharge zone 22 and mixing and burning with oxygen from air and / or oxygen enriched air.
【００２２】 炉筒３０は、予熱区域２６の出口領域と処理区域２４のコードラント３の入口
領域との間の任意の場所に位置させればよい。本発明の好適な実施例では回転炉
床炉１０は、予熱区域２６の出口領域又は処理区域２４のコードラント２の出口
領域の付近に位置させた炉筒３０を備える。炉筒３０を大体予熱区域２６の出口
領域に位置させることにより回転炉床炉の装入区域及び放出区域が大気圧に等し
い圧力に保持され、正圧状態では炉ガスが装入機構又は放出機構を経て逃げない
ようにし又負圧状態では望ましくない空気が炉に入らないようにする。The furnace tube 30 may be located anywhere between the outlet area of the preheating section 26 and the inlet area of the cordant 3 in the processing section 24. In a preferred embodiment of the present invention, the rotary hearth furnace 10 includes a furnace tube 30 located near the exit area of the preheating section 26 or the exit area of the cordrant 2 in the processing section 24. By placing the furnace tube 30 approximately in the outlet region of the preheating section 26, the charging and discharging areas of the rotary hearth furnace are maintained at a pressure equal to atmospheric pressure, and in a positive pressure condition the furnace gas is charged or discharged. To prevent unwanted air from entering the furnace under negative pressure conditions.
【００２３】 図２に示すように炉筒３０は、相互に連結した１連の水平に延びるアフタバー
ナ室３２と１個又は複数個の上下方向に延びる煙突３４とを備える。各室３２の
底部はなお後述するように排出室として又収集領域として作用する。各アフタバ
ーナ室３２の底部には当業界によく知られた粉じん除去弁（ｄｕｓｔ ｒｅｍｏ
ｖａｌ ｖａｌｖｅ）３６を作動的に連結してある。粉じん除去弁３６により落
下してアフタバーナ室３２内にたまる粉じん（ｄｕｓｔ）及び粒状物の操作及び
除去が容易になる。As shown in FIG. 2, the furnace tube 30 includes a series of horizontally extending afterburner chambers 32 connected to each other, and one or more vertically extending chimneys 34. The bottom of each chamber 32 still serves as a discharge chamber and a collection area, as will be described below. The bottom of each of the afterburner chambers 32 is provided with a dust removal valve well known in the art.
A val valve 36 is operatively connected. The dust removal valve 36 facilitates the operation and removal of dust and particulates that fall and accumulate in the afterburner chamber 32.
【００２４】 廃棄物の顕在エネルギー及び化学エネルギーを含む、炉筒３０内の高温の排気
煙突ガスが回転炉床炉１０から出るのは明らかである。廃棄物顕在エネルギーは
熱の形であり、化学エネルギーは有機質揮発性物質、一酸化炭素及び水素の形で
ある。煙突ガスは又酸化金属細粒及び／又は炭素質物質から成る粒子を含む。回
転炉床炉１０からの煙突ガスに対する許容できる排出物基準が得られるようにす
るのに、燃焼空気及び／又は酸素をアフタバーナ室３２に空気管３８を介して導
入し回転炉床炉１０からの有機質揮発性物質、その他の可燃性ガス及び炭素質粒
子と共に燃焼させる。煙突ガス内の未燃焼の粒子は次いで、粉じん除去弁３６を
経て除去するためにアフタバーナ室３２の後方の下流側収集区域内で沈降させる
。It is clear that the hot exhaust chimney gas in the furnace tube 30, including the apparent energy of the waste and the chemical energy, exits the rotary hearth furnace 10. Waste manifest energy is in the form of heat, and chemical energy is in the form of organic volatiles, carbon monoxide and hydrogen. The chimney gas also contains metal oxide fines and / or particles composed of carbonaceous material. Combustion air and / or oxygen is introduced into the afterburner chamber 32 via an air line 38 to provide an acceptable emission standard for the stack gas from the rotary hearth furnace 10. Combustion with organic volatiles, other flammable gases and carbonaceous particles. The unburned particles in the chimney gas are then settled in a downstream collection area behind the afterburner chamber 32 for removal via a dust removal valve 36.
【００２５】 ガスが回転炉床炉１０から１８００°Ｆないし２３５０°Ｆの範囲の温度で出
て燃焼空気及び／又は酸素と混合すると２５００°Ｆを越える温度に上昇する。
２５００°Ｆを越える温度では窒素酸化物が生成しやすくなる。従って、低い粒
状物放出許容できる炭化水素排出、許容できる一酸化炭素排出及び許容できる低
いＮＯｘ排出が容易になるようにするにはアフタバーナ室３２内の燃焼温度を制
御する必要がある。アフタバーナ室３７内の温度は、窒素酸化物を生成する窒素
の酸化を防ぐように再燃焼処理を約１８００°Ｆ以下に制御する。アフタバーナ
室３２内の温度は、噴水冷却装置（ｗａｔｅｒ ｓｐｒａｙ ｑｕｅｎｃｈ）に
よって制御する。噴水冷却装置では、水滴を霧化しアフタバーナ室３２及び炉筒
３０内の温度を冷却することにより燃焼空気及び／又は酸素の流れ内に水滴を噴
射する。好適な実施例では水滴は炉筒３０内に複数個の流体ノズル４０を介し噴
射する。流体ノズル４０は大体において、スプレイング・システムズ・カムパニ
（Ｓｐｒａｙｉｎｇ Ｓｙｓｔｅｍｓ Ｃｏ．）製のフロ・マックス（Ｆｌｏ
Ｍａｘ）空気霧化ノズル（ａｉｒ ａｔｏｍｉｚｉｎｇ ｎｏｚｚｌｅ）のよう
な任意適当なノズルでよい。Gases exit the rotary hearth furnace 10 at temperatures in the range of 1800 ° F to 2350 ° F and rise to temperatures above 2500 ° F when mixed with combustion air and / or oxygen.
At temperatures above 2500 ° F., nitrogen oxides tend to form. Accordingly, it is necessary to control the combustion temperature in the afterburner chamber 32 to facilitate low particulate emissions, acceptable hydrocarbon emissions, acceptable carbon monoxide emissions, and acceptable low NOx emissions. The temperature in the afterburner chamber 37 controls the reburn process to about 1800 ° F. or less to prevent oxidation of nitrogen to form nitrogen oxides. The temperature in the afterburner chamber 32 is controlled by a water spray quencher. In the fountain cooling device, water droplets are sprayed into the flow of combustion air and / or oxygen by atomizing water droplets and cooling the temperatures in the afterburner chamber 32 and the furnace tube 30. In the preferred embodiment, water droplets are injected into the furnace tube 30 through a plurality of fluid nozzles 40. Fluid nozzle 40 is generally a Flo Max made by Spraying Systems Co.
Max) Any suitable nozzle, such as an air atomizing nozzle.
【００２６】 典型的な回転炉床炉の操作の場合にバーナ２０からの燃焼ガスと供給材料の処
理から生ずるガスとはこの炉の装入区域２６の近くで放出し供給材料を排ガス及
び処理ガスに最高に露出させるのは明らかである。しかし典型的な回転炉床炉内
に生ずる排ガス及び可燃性濃縮処理ガス（ｃｏｍｂｕｓｔｉｂｌｅ ｒｉｃｈ
ｐｒｏｃｅｓｓ ｇａｓ）は直接炉筒に流れ還元区域を短絡することが分ってい
る。In the operation of a typical rotary hearth furnace, the combustion gases from the burner 20 and the gases resulting from the processing of the feedstock are released near the furnace charge area 26 and the feedstock is discharged and treated gasses. It is clear that the best exposure is. However, exhaust gas and combustible enriched process gas generated in a typical rotary hearth furnace are used.
process gas has been found to flow directly into the furnace tube and short circuit the reduction zone.
【００２７】 本発明の種種の態様を、本発明を単に例示した以下の各例によりさらに詳しく
述べる。Various embodiments of the present invention are described in further detail by the following examples, which merely exemplify the invention.
【００２８】 例 本回転炉床炉は２つの区域すなわち予熱区域２６及び処理区域２４に再分割す
る。この回転炉床炉の処理区域２４は図１に示すように３つの互いに等しいコー
ドラント１、２、３に再分割し煙突ガス流に対する炉筒の位置の影響とエネルギ
ー消費量とを算定する。煙突ガス流量は、このファーネスから生ずる燃焼生成物
及び処理ガスの計測した流量割合である。エネルギー消費量は供給材料を還元す
るのに消費する測定エネルギーである。EXAMPLE The rotary hearth furnace subdivides into two zones, a preheating zone 26 and a processing zone 24. The processing zone 24 of this rotary hearth furnace is subdivided into three equal cordrants 1, 2, 3 as shown in FIG. 1 to calculate the effect of the position of the furnace tube on the chimney gas flow and the energy consumption. The chimney gas flow rate is a measured flow rate ratio of the combustion products generated from the furnace and the processing gas. Energy consumption is the measured energy consumed to reduce the feedstock.
【００２９】 これ等の例では、約７９重量％の凝集した低シリカ赤鉄鉱と約２１重量％の低
揮発性歴青炭とから成る約１０５．０３２ｌｂ／ｈｒの供給材料を回転炉床炉内
で還元するものとする。この回転炉床炉は、この回転炉床炉のコードラント３内
に還元ふん囲気を保持するのに約２３５０°Ｆの一定の操作温度と約２ないし３
の操作ＣＯ／ＣＯ２比とに保持する。全コードラントに対する送出し燃焼空気は
このファーネス内への導入に先だって約１２００°Ｆに予熱する。In these examples, a feed of about 105.032 lb / hr consisting of about 79% by weight of agglomerated low silica hematite and about 21% by weight of a low volatility bituminous coal is fed into a rotary hearth furnace. To be reduced. The rotary hearth furnace has a constant operating temperature of about 2350 ° F. and a temperature of about 2 to 3 to maintain a reducing atmosphere within the cordrant 3 of the rotary hearth furnace.
The operation is maintained at the CO / CO 2 ratio. The outgoing combustion air for all cordants is preheated to about 1200 ° F prior to introduction into the furnace.
【００３０】 ２３５０°Ｆの一定の炉温度を保持するようにこの回転炉床炉に供給する天然
ガス燃料の量は、各コードラント１、２、３の出口領域と予熱区域２６の出口領
域と装入区域の出口領域とに位置させると、炉筒の位置に従って定める。The amount of natural gas fuel supplied to the rotary hearth furnace to maintain a constant furnace temperature of 2350 ° F. depends on the outlet area of each cordrant 1, 2, 3 and the outlet area of the preheating section 26. When it is located in the outlet area of the charging area, it is determined according to the position of the furnace tube.
【００３１】[0031]
【表２】 [Table 2]
【００３２】 図２に示すように天然ガスの最大の要求は、炉床をコードラント３の出口領域
に位置させたときに生ずる。さらに天然ガスの最低の要求は、炉筒を予熱区域２
６の出口領域に位置させたときに生ずる。As shown in FIG. 2, the greatest demand for natural gas arises when the hearth is located in the exit area of the cordrant 3. In addition, the minimum requirement for natural gas is to replace the furnace tube with a preheat zone 2
Occurs when placed in the exit area of No. 6.
【００３３】 回転炉床炉からの煙突ガスの体積は、コードラント３、２、１及び予熱区域２
６の出口領域と装入区域のすぐ下流側とにおける炉筒の位置に従って定める。こ
の結果は以下の表３ないし５に記載してある。The volume of the chimney gas from the rotary hearth furnace is determined by the
6 according to the position of the furnace tube in the outlet area and immediately downstream of the charging area. The results are set forth in Tables 3-5 below.
【００３４】[0034]
【表３】 炉排出物（ｌｂ／ｈｒ） [Table 3] Furnace emissions (lb / hr)
【００３５】[0035]
【表４】 アフタバーナ空気（ｌｂ／ｈｒ） [Table 4] Afterburner air (lb / hr)
【００３６】[0036]
【表５】 [Table 5]
【００３７】 表５に示すように煙突ガスの最高の流量は、炉筒をコードラント３の出口領域
に位置させたときに生ずる。さらに煙突ガスの最低の流量は炉床を予熱区域２６
の出口領域に位置させたときに生ずる。As shown in Table 5, the highest flow rate of the chimney gas occurs when the furnace tube is located in the outlet region of the cordrant 3. In addition, the lowest flow rate of chimney gas reduces
Occurs when positioned in the exit area of
【００３８】 石炭揮発性物質（ｃｏａｌ ｖｏｌａｔｉｌｅ）は、炉の予熱区域２６でほと
んど金属蒸着を伴わないで放出され低いＣＯ／ＣＯ２比で燃焼する。コードラン
ト１、２ではＣＯ／ＣＯ２比は供給材料内の還元鉄の再酸化を制限するのに一層
重要になる。コードラント３ではＣＯ／ＣＯ２比は還元鉄の再酸化を抑止するの
に約１．５ないし３．５でなければならない。コードラント３内で生ずるＣＯ及
びその他の還元ガスはコードラント１、２内で燃焼し還元処理にエネルギーを加
える。ＣＯ及びＨ２を燃焼させ煙突ガスの体積分を還元させるようにこのファー
ネスに空気を加える。Coal volatiles are emitted with little metal deposition in the preheating zone 26 of the furnace and burn at a low CO / CO 2 ratio. In cordants 1 and 2, the CO / CO 2 ratio becomes even more important in limiting the reoxidation of reduced iron in the feed. In Cordrant 3, the CO / CO 2 ratio must be about 1.5 to 3.5 to prevent reoxidation of reduced iron. The CO and other reducing gases generated in the cordrant 3 burn in the cordants 1 and 2 to add energy to the reduction process. By burning CO and H 2 is added air to the furnace so as to reduce the volume of the chimney gases.
【００３９】 本発明方法のなお他の実施例ではコードラント３の予熱した燃焼空気は、９５
％純度の酸素で濃縮される（ｅｎｒｉｃｈｅｄ）。酸素含量は典型的には約２１
％から３０％にも増す。この増加により有効熱が燃料の称呼値２１８から２６５
ＢＴＵ／ｆｔ３に向上する。In still another embodiment of the method of the present invention, the preheated combustion air of the cordrant 3 is 95
Enriched with% pure oxygen. The oxygen content is typically about 21
From 30% to 30%. Due to this increase, the effective heat is increased from the nominal value 218 to 265 of the fuel.
To improve the BTU / ft 3.
【００４０】 前記の各特許明細書及び各文書はそれぞれ本説明に参照してある。Each of the above-mentioned patent specifications and each of the documents is referred to in this description.
【００４１】 以上本発明の好適な実施例について述べたが本発明はなおその精神を逸脱しな
いで種種の変化変型を行うことができるのはもちろんである。Although the preferred embodiment of the present invention has been described above, it goes without saying that the present invention can be subjected to various changes and modifications without departing from the spirit thereof.
【図１】 本発明回転炉床炉の平面図である。FIG. 1 is a plan view of a rotary hearth furnace of the present invention.
【図２】 図１の２−２線に沿う拡大断面図である。FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG.
１０ 回転炉床炉 １２ 回転炉床 １４ 環状の外壁 １６ 環状の内壁 １８ 頂部 ２０ バーナ ２２ 放出区域 ２４ 処理区域 ２６ 予熱区域 ２８ 装入区域 ３０ 炉筒 DESCRIPTION OF SYMBOLS 10 Rotary hearth furnace 12 Rotary hearth 14 Annular outer wall 16 Annular inner wall 18 Top 20 Burner 22 Release area 24 Processing area 26 Preheating area 28 Charging area 30 Furnace
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｆ２７Ｂ 9/36 Ｆ２７Ｂ 9/36 ４Ｋ０６３ 9/40 9/40 Ｆ２７Ｄ 7/02 Ｆ２７Ｄ 7/02 Ａ 7/06 7/06 Ｃ 17/00 １０４ 17/00 １０４Ａ １０４Ｄ １０４Ｇ 19/00 19/00 Ａ (72)発明者 スォーントン，ジェイムズ，アラン アメリカ合衆国オハイオ州43614、タリー ドウ、キーゲイト 2606番 アパートマン ト・＃２ Ｆターム(参考） 3K061 AA07 AB02 AC20 BA03 BA04 BA08 BA09 CA01 DA19 DB20 FA21 3K065 TA01 TB04 TB11 TC04 TF05 3K078 AA03 AA04 AA08 AA09 BA08 BA19 CA02 CA07 CA11 4K050 AA00 BA01 CA09 CA11 CD02 CD16 CF09 CG22 DA07 EA01 EA05 EA06 4K056 AA00 BB01 CA01 DB03 DB05 FA03 FA08 FA13 4K063 AA00 AA13 BA02 BA03 CA01 CA02 DA14 DA15 DA32 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification code FI theme coat ゛ (Reference) F27B 9/36 F27B 9/36 4K063 9/40 9/40 F27D 7/02 F27D 7/02 A 7/06 7/06 C 17/00 104 17/00 104A 104D 104G 19/00 19/00 A (72) Inventor Shornton, James, Alan Tally Doe, Keygate 2606, Tarry Dow, Ohio, United States of America No. 2606 Apartment # 2 F-term (Ref.) FA03 FA08 FA13 4K063 AA00 AA13 BA02 BA03 CA01 CA02 DA14 DA15 DA32
Claims (23)
少なくとも装入区域、予熱区域、処理区域及び放出区域を含む複数の区域に分割
され、 前記処理区域はさらに、それぞれ入口領域及び出口領域を持つ３つの逐次のコ
ードラント１、２、３に分割され、 前記予熱区域は１８００°Ｆないし２２００°Ｆの温度範囲で作動し、 前記処理区域は２３００°Ｆないし２６００°Ｆの温度範囲で作動し、 前記複数個のバーナを、前記回転炉床炉内に制御した温度を提供するように、
前記囲いの少なくとも前記外壁又は内壁内に位置させ、 前記炉筒を、前記予熱区域の前記出口領域と、前記処理区域の前記コードラン
ト１の領域との間に位置させ、 前記炉筒に、排出燃焼ガスをさらに燃焼させ、前記回転炉床炉から粒子を収集
するための少なくとも１個のアフタバーナ室を設け、 前記アフタバーナ室に、ＮＯｘ制御のために、燃焼温度を減少させる噴水冷却
装置を設けて成る、 供給材料を還元する回転炉床炉。1. A rotary hearth furnace for reducing feedstock, comprising: a rotary hearth disposed within an enclosure and mounted for rotational movement; a plurality of burners; and a combustion gas from the rotary hearth furnace. A furnace tube for the enclosure for discharging air, wherein the enclosure has an annular inner wall, an annular outer wall and a top, and is operatively sealed to the rotary hearth;
Divided into a plurality of zones including at least a charging zone, a preheating zone, a processing zone and a discharge zone, said processing zone being further divided into three sequential cordrants 1, 2, 3 each having an inlet area and an outlet area The preheating zone operates at a temperature range of 1800 ° F. to 2200 ° F .; the processing zone operates at a temperature range of 2300 ° F. to 2600 ° F .; To provide a controlled temperature to
At least in the outer wall or the inner wall of the enclosure, the furnace tube is positioned between the outlet region of the preheating section and the region of the cordrant 1 in the processing region; At least one afterburner chamber for further burning the combustion gas and collecting particles from the rotary hearth furnace is provided, and the afterburner chamber is provided with a fountain cooling device for reducing a combustion temperature for NOx control. Consisting of a rotary hearth furnace for reducing the feedstock.
、金属ミル廃棄物、アーク炉粉じん、圧延機スケール及びこれ等の混合物から選
定した請求項１の回転炉床炉。2. The rotary furnace of claim 1 wherein said feed material is selected from untreated metal oxide concentrate, natural metal ore fines, metal mill waste, arc furnace dust, rolling mill scale, and mixtures thereof. Floor furnace.
炉。3. The rotary hearth furnace of claim 2 wherein said feed further comprises a carbonaceous material.
ークス及び石油コークス含有混合物から選定した請求項３の回転炉床炉。4. The rotary hearth furnace according to claim 3, wherein said carbonaceous material is selected from a coal material, a mixture containing coal material, petroleum coke, and a mixture containing petroleum coke.
うな深さのほぼ一層にして前記炉床上に均等に配分するようにした請求項１の回
転炉床炉。5. The rotary hearth furnace of claim 1 wherein said feed material is distributed evenly over said hearth with a depth of approximately one layer to facilitate uniform processing of said feed material.
作用を加えることにより、前記供給材料を還元するようにした請求項２の回転炉
床炉。6. The rotary hearth furnace according to claim 2, wherein the feed material is reduced by applying radiant heating and action of the combustion gas from each of the burners to the feed material.
質から生ずる処理ガスとの放射加熱及び作用を加えることにより、前記供給材料
を還元するようにした請求項４の回転炉床炉。7. The rotation of claim 4, wherein the feed is reduced by applying radiant heating and action of the combustion gas from each of the burners and the processing gas generated from the volatile material to the feed. Hearth furnace.
空気を導入する空気入口を設けた請求項１の回転炉床炉。8. The rotary hearth furnace according to claim 1, wherein each of said burners is provided with an air inlet for introducing air so as to burn with the combustible gas in said enclosure.
域に位置させた請求項１の回転炉床炉。9. The rotary hearth furnace according to claim 1, wherein a furnace tube of said rotary hearth furnace is located substantially in an outlet area of said cordrant.
位置させた請求項１の回転炉床炉。10. The rotary hearth furnace according to claim 1, wherein a furnace tube of said rotary hearth furnace is located substantially in an outlet region of said preheating section.
、回転運動するように取付けられた回転炉床を備えた回転炉床内の供給材料を還
元する方法であって、前記囲いを前記回転炉床に作動的に密封し、少なくとも装
入区域、予熱区域、処理区域及び放出区域を含む複数の区域に分割し、前記処理
区域をさらにそれぞれ入口領域及び出口領域を持つ３つの逐次のコードラント１
、２、３に分割して成る回転炉床炉内の供給材料を還元する方法において、 前記回転炉床炉の装入区域内に供給材料を装入する段階と、 この供給材料を前記囲い内の炉床径路に沿い前記装入区域から前記処理区域を
経て前記放出区域に移送する段階と、 所望の炉温度が得られるように各バーナを着火する段階と、 前記回転炉床炉内で前記供給材料を還元する段階と、 還元した前記供給材料を前記回転炉床炉から取出す段階であって、前記予熱区
域の出口領域と、前記処理区域のコードラント２の入口領域との間に作動的に位
置させられ、前記回転炉床炉からの放出燃焼ガスの燃焼と粒子の収集とのために
少なくとも１個のアフタバーナ室を備えた炉筒を通ってバーナから燃焼ガスを放
出する段階と、 前記アフタバーナ室内に噴水冷却装置により噴霧することによって前記アフタ
バーナ室内の燃焼温度を低下させる段階と、 を包含する、回転炉床炉内の供給材料を還元する方法。11. A method for reducing feedstock in a rotary hearth having a rotary hearth disposed in an enclosure having an annular inner wall, an annular outer wall, and a top and mounted for rotational movement. Operatively sealing the enclosure to the rotary hearth, dividing the enclosure into a plurality of zones including at least a charging zone, a preheating zone, a processing zone and a discharge zone, wherein the processing zone further has an inlet area and an outlet area, respectively. Three sequential cordrants 1
A method for reducing a feed material in a rotary hearth furnace divided into two, three, and charging a feed material into a charging area of the rotary hearth furnace; Transferring from the charging zone through the processing zone to the discharge zone along the hearth path; igniting each burner to obtain a desired furnace temperature; and Reducing the feedstock and removing the reduced feedstock from the rotary hearth furnace, wherein the feedstock is operable between an outlet region of the preheating zone and an inlet region of the cordrant 2 in the processing zone. Discharging combustion gas from the burner through a furnace tube provided with at least one afterburner chamber for combustion of the combustion gas discharged from the rotary hearth furnace and collection of particles; and Fountain cooling device in afterburner room Including the steps of lowering the combustion temperature of the afterburner chamber by more spraying, a method of reducing the feed rotary hearth furnace.
作用とを加えることにより、前記供給材料を還元する請求項１１の方法。12. The method of claim 11, wherein the feed is reduced by applying radiant heating and action of the combustion gases from each of the burners to the feed.
記供給材料に含まれる揮発性物質と、燃焼処理からの任意の過剰の一酸化炭素及
び水素と共に燃焼させ二酸化炭素を生成し熱を放出し前記供給材料の処理のため
に所望の炉床温度を保持するようにする段階を含む請求項１１の方法。13. A combustion air is further introduced into a preheating zone of the rotary hearth furnace to combust the volatiles contained in the feedstock and any excess carbon monoxide and hydrogen from the combustion process. 12. The method of claim 11 including the step of producing and releasing heat to maintain a desired hearth temperature for processing of the feed.
空気だけを導入し燃焼ガスを部分的に燃焼させるようにする請求項１１の方法。14. The method of claim 11, wherein only combustion air is introduced through said burner of cordrant 1 in said treatment zone to partially combust combustion gases.
る請求項１４の方法。15. The method of claim 14 wherein said combustion air is preheated to about 800 ° F. to 1400 ° F.
法。16. The method of claim 15 wherein said combustion air is preheated to about 1200 ° F.
６の方法。19. The method according to claim 1, wherein the preheated combustion air of the cordrant 3 is enriched with oxygen.
Method 6.
する請求項１９の方法。20. The method of claim 19, further comprising enriching the preheated combustion air with about 21% to 30% oxygen.
粒、金属ミル廃棄物、アーク炉粉じん、圧延機スケール、石炭材料、石炭材料含
有混合物及びこれ等の混合物から選定する請求項１１の方法。21. The feedstock is prepared from untreated metal oxide concentrate, natural metal ore fines, metal mill waste, electric arc furnace dust, rolling mill scale, coal material, coal material containing mixtures and mixtures thereof. 12. The method of claim 11, wherein the method is selected.
求項１９の方法。22. The method according to claim 19, wherein the furnace tube is located substantially at an outlet region of the cordant.
項１９の方法。23. The method of claim 19, wherein said furnace tube is located substantially at an exit area of said preheating zone.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/US1999/005671 WO2000055559A1 (en) | 1999-03-15 | 1999-03-15 | A method and apparatus for reducing a feed material in a rotary hearth furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002539415A true JP2002539415A (en) | 2002-11-19 |
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ID=22272361
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000605147A Pending JP2002539415A (en) | 1999-03-15 | 1999-03-15 | Method and apparatus for reducing feedstock in a rotary hearth furnace |
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| Country | Link |
|---|---|
| JP (1) | JP2002539415A (en) |
| KR (1) | KR100654478B1 (en) |
| CN (1) | CN1175237C (en) |
| AU (1) | AU768518B2 (en) |
| CA (1) | CA2366290C (en) |
| WO (1) | WO2000055559A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005121644A1 (en) * | 2004-06-14 | 2005-12-22 | Weitian Zhang | A method and a succession system for incinerating waste |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1340822B1 (en) * | 2000-11-10 | 2008-01-16 | Nippon Steel Corporation | Method for operating rotary hearth type reducing furnace and rotary hearth type reducing furnace facilities |
| PT103585B (en) * | 2006-10-12 | 2008-11-03 | Ventil Engenharia Do Ambiente | COMBUSTION SYSTEM FOR VERTICAL BOILERS |
| JP5957348B2 (en) * | 2012-09-21 | 2016-07-27 | Ｐｒｉｍｅｔａｌｓ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｊａｐａｎ株式会社 | Partially reduced iron production equipment |
| CN104792153B (en) * | 2014-01-20 | 2017-12-01 | 宜宾恒旭窑炉科技开发有限公司 | A kind of gas collection system of rotary kiln |
| CN104910924B (en) * | 2014-03-14 | 2018-04-10 | 袁承世 | A kind of ring kiln formula continuous type retort retort |
| CN111637431A (en) * | 2020-06-05 | 2020-09-08 | 重庆赛迪热工环保工程技术有限公司 | Waste heat boiler for recycling smoke heat of rotary hearth furnace |
| CN112981060B (en) * | 2021-01-28 | 2022-09-06 | 济南华富锻造股份有限公司 | Temperature-controlled quenching furnace |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3836320A (en) * | 1972-03-17 | 1974-09-17 | Midland Ross Corp | Minimum scale reheating furnace and means relating thereto |
| US4870912A (en) * | 1988-02-25 | 1989-10-03 | Westinghouse Electric Corp. | Automatic combustion control method for a rotary combustor |
| US5632616A (en) * | 1994-11-28 | 1997-05-27 | Cadence Environmental Energy, Inc. | Method and apparatus for injecting air into long cement kilns |
-
1999
- 1999-03-15 CA CA002366290A patent/CA2366290C/en not_active Expired - Fee Related
- 1999-03-15 KR KR1020017011741A patent/KR100654478B1/en not_active IP Right Cessation
- 1999-03-15 CN CNB998164690A patent/CN1175237C/en not_active Expired - Fee Related
- 1999-03-15 WO PCT/US1999/005671 patent/WO2000055559A1/en active IP Right Grant
- 1999-03-15 JP JP2000605147A patent/JP2002539415A/en active Pending
- 1999-03-15 AU AU30908/99A patent/AU768518B2/en not_active Ceased
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005121644A1 (en) * | 2004-06-14 | 2005-12-22 | Weitian Zhang | A method and a succession system for incinerating waste |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1338036A (en) | 2002-02-27 |
| CN1175237C (en) | 2004-11-10 |
| WO2000055559A1 (en) | 2000-09-21 |
| CA2366290C (en) | 2008-02-12 |
| AU3090899A (en) | 2000-10-04 |
| KR100654478B1 (en) | 2006-12-05 |
| KR20020001772A (en) | 2002-01-09 |
| AU768518B2 (en) | 2003-12-18 |
| CA2366290A1 (en) | 2000-09-21 |
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