JP4355748B2 - Method for producing iron ore pellets - Google Patents

Method for producing iron ore pellets Download PDF

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JP4355748B2
JP4355748B2 JP2008084178A JP2008084178A JP4355748B2 JP 4355748 B2 JP4355748 B2 JP 4355748B2 JP 2008084178 A JP2008084178 A JP 2008084178A JP 2008084178 A JP2008084178 A JP 2008084178A JP 4355748 B2 JP4355748 B2 JP 4355748B2
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water separation
separation chamber
chamber
pellet
iron ore
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JP2009235507A (en
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剛司 牧
信弘 長谷川
充 坂本
伸之 岩▲崎▼
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Kobe Steel Ltd
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Kobe Steel Ltd
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Priority to PCT/JP2009/054431 priority patent/WO2009119291A1/en
Priority to UAA201012709A priority patent/UA94202C2/en
Priority to CN200980103850.1A priority patent/CN101932738B/en
Priority to BRPI0908190A priority patent/BRPI0908190B1/en
Priority to RU2010143867/02A priority patent/RU2459878C2/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/16—Sintering; Agglomerating
    • C22B1/22—Sintering; Agglomerating in other sintering apparatus
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/2413—Binding; Briquetting ; Granulating enduration of pellets
    • 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
    • F27B7/2016—Arrangements of preheating devices for 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
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/38—Arrangements of cooling devices

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  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
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  • Geochemistry & Mineralogy (AREA)
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  • Manufacturing & Machinery (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Description

本発明は、高炉用原料などに使用される鉄鉱石ペレットを製造するグレートキルン方式による鉄鉱石ペレット製造技術に関する。   The present invention relates to a technology for producing iron ore pellets by a great kiln method for producing iron ore pellets used for blast furnace raw materials and the like.

鉄鉱石ペレットをつくる製造工程は、乾燥、離水、予熱、焼成および冷却の各工程からなり、この製造工程の実施に用いられるグレートキルン方式鉄鉱石ペレット製造装置（以下、単に「グレートキルン方式焼成装置」という。）として、従来、図４の縦断面図に示すようなものが知られている。同図に示すように、このグレートキルン方式焼成装置は、グレート炉１、ロータリキルン（以下、単に「キルン」ともいう。）９およびアニュラクーラ１１を備えている。   The manufacturing process for producing iron ore pellets consists of drying, water separation, preheating, firing and cooling processes. Great kiln type iron ore pellet manufacturing equipment (hereinafter simply referred to as “Great kiln type firing equipment”) used for carrying out this manufacturing process. Conventionally, the one shown in the longitudinal sectional view of FIG. 4 is known. As shown in the figure, this great kiln type firing apparatus includes a great furnace 1, a rotary kiln (hereinafter also simply referred to as “kiln”) 9, and an annunculus 11.

グレート炉１は、無端状をなすトラベリング・グレート（以下、単に「グレート」という。）２によりこのグレート２上に敷かれた生ペレットＧＰを、乾燥室３、離水室４、予熱室５の順に各室の長手方向に移動させつつ、加熱用ガスの下向き通風によって乾燥・離水・予熱してペレット（予熱ペレット）にキルン９での転動に耐えうる強度を付与するものである。   The great furnace 1 is composed of an endless traveling grate (hereinafter simply referred to as “grate”) 2 and raw pellets GP laid on the grate 2 in the order of a drying chamber 3, a water separation chamber 4, and a preheating chamber 5. While moving in the longitudinal direction of each chamber, drying, water separation, and preheating are performed by downward ventilation of the heating gas to give the pellets (preheated pellets) strength that can withstand rolling in the kiln 9.

生ペレットＧＰは、主原料としての鉄鉱石に副原料としての石灰石、ドロマイト等を配合し、さらに水分を添加して造粒されたものである。   The raw pellet GP is granulated by blending limestone, dolomite, and the like as auxiliary raw materials with iron ore as a main raw material, and further adding moisture.

先ず、乾燥室３では、水分含有量８〜９質量％程度の生ペレットＧＰを２５０℃程度の雰囲気温度で乾燥させる。次いで、離水室４では、乾燥された生ペレットを４５０℃程度に昇温し、主に鉄鉱石中の結晶水を分解除去する。さらに、予熱室では、ペレットを１１００℃程度まで昇温し、石灰石、ドロマイト等に含まれる炭酸塩を分解しＣＯ２を除去するとともに、鉄鉱石中のマグネタイトを酸化させる。このような工程を経て、キルン９での転動に十分耐えうる強度を有する予熱ペレットを作製することで、グレートキルン方式焼成装置の生産性を高めることが可能となる。 First, in the drying chamber 3, the raw pellet GP having a water content of about 8 to 9% by mass is dried at an atmospheric temperature of about 250 ° C. Next, in the water separation chamber 4, the dried raw pellets are heated to about 450 ° C., and the crystal water in the iron ore is mainly decomposed and removed. Further, in the preheating chamber, the temperature of the pellet is raised to about 1100 ° C. to decompose carbonate contained in limestone, dolomite and the like to remove CO 2 and oxidize magnetite in the iron ore. By producing preheated pellets having such a strength that can sufficiently withstand rolling in the kiln 9 through such steps, it becomes possible to increase the productivity of the great kiln type baking apparatus.

ロータリキルン９は、このグレート炉１に直結されており、勾配をつけた円筒状回転炉であって、出口側に配設されたキルンバーナ１０による燃焼により、グレート炉１の予熱室５から装入された前記乾燥・離水・予熱されたペレットを焼成する一方、そのペレット焼成用に使用された高温の燃焼排ガスを加熱用ガスとして予熱室５へ送り込むものである。従来は、キルンバーナ１０により微粉炭、コークス炉ガス等の燃料をロータリキルン９内に吹き込み、燃焼用空気とともに燃焼させるようにしている。   The rotary kiln 9 is directly connected to the great furnace 1 and is a cylindrical rotary furnace with a gradient. The rotary kiln 9 is charged from the preheating chamber 5 of the great furnace 1 by combustion by the kiln burner 10 disposed on the outlet side. While the dried, dewatered and preheated pellets are fired, the high-temperature combustion exhaust gas used for firing the pellets is fed into the preheating chamber 5 as a heating gas. Conventionally, fuel such as pulverized coal and coke oven gas is blown into the rotary kiln 9 by the kiln burner 10 and burned together with combustion air.

また、予熱室５には、ロータリキルン９からのキルン燃焼排ガスを昇温させるためのキルン燃焼排ガス昇温手段としての予熱室バーナ２１が設けられている。予熱室バーナ２１の燃料としてコークス炉ガス（以下、「ＣＯＧ」と略称する。）や微粉炭が用いられ、予熱室５内でこのＣＯＧや微粉炭をキルン燃焼排ガス中の残留酸素で燃焼させることにより、キルン燃焼排ガスを昇温させるようにしている。こうすることで、予熱されたペレット（以下、「予熱ペレット」という。）の強度を高めることができ、操業不安定の原因となるロータリキルン９内におけるキルンリング（ペレット粉化物がキルン内壁レンガ表面に岩状に付着したもの）の発生を防止するようにしている（特許文献１，２参照）。   The preheating chamber 5 is provided with a preheating chamber burner 21 as a kiln combustion exhaust gas temperature raising means for raising the temperature of the kiln combustion exhaust gas from the rotary kiln 9. Coke oven gas (hereinafter abbreviated as “COG”) or pulverized coal is used as fuel for the preheating chamber burner 21, and this COG or pulverized coal is burned with residual oxygen in the kiln combustion exhaust gas in the preheating chamber 5. Thus, the temperature of the kiln combustion exhaust gas is raised. By doing so, the strength of the preheated pellets (hereinafter referred to as “preheat pellets”) can be increased, and the kiln ring in the rotary kiln 9 causing the unstable operation (the pelletized powder is the kiln inner wall brick surface) In the shape of rocks) (see Patent Documents 1 and 2).

１６は離水室用風箱群である。グレート２の下方空間はペレット移動方向に沿って複数個の部屋に仕切られており、これらの部屋が風箱と呼ばれている。つまり、離水室用風箱群１６は複数個の風箱よりなるものであり、離水室５に対してその長手方向（ペレット移動方向）に沿って一列に例えば５個の風箱が並設されている。１７は離水室用吸引ファンで、吸引風量（下向通風量）調節用のファンダンパ（図示省略）を有し、予熱室排ガスＡを加熱用ガスとして離水室４に導き、この加熱用ガスＡをグレート２上のペレット層、風箱群１６を通して下向きに吸引し、次の乾燥室３へ送り出すものである。   Reference numeral 16 denotes a wind chamber group for the water separation chamber. The space below Great 2 is partitioned into a plurality of rooms along the pellet movement direction, and these rooms are called wind boxes. That is, the water chamber compartment 16 is composed of a plurality of air boxes, and, for example, five air boxes are arranged in a row along the longitudinal direction (pellet movement direction) with respect to the water compartment 5. ing. Reference numeral 17 denotes a suction fan for the water separation chamber, which has a fan damper (not shown) for adjusting the suction air volume (downward ventilation volume), leads the preheating chamber exhaust gas A to the water separation chamber 4 as a heating gas, and this heating gas A Is sucked downward through the pellet layer on the great 2 and the wind box group 16 and sent out to the next drying chamber 3.

上記予熱室バーナ２１設置による予熱室内雰囲気温度の制御技術は、ペレット生産速度が一定で、生ペレットＧＰ中の結晶水含有量も一定の場合には、予熱ペレットの強度を高めるのに非常に有効な手段である。   The control technology of the preheating chamber atmosphere temperature by installing the preheating chamber burner 21 is very effective in increasing the strength of the preheating pellet when the pellet production rate is constant and the content of crystal water in the raw pellet GP is also constant. Means.

ところで、近年の鉄鋼需要の増大に対応すべくペレットのさらなる増産が要請されている。また、近年における鉄鉱石原料の劣質化に伴ってペレットへの高結晶水鉱石の配合割合の増加も要請されている。しかしながら、これらの要請に対応すべく、単にペレット生産速度を増大させた場合や、ペレット生産速度を維持しつつ単に生ペレットＧＰ中の結晶水含有量を高めた場合には、離水室４内雰囲気温度を従来どおりに維持したままで操業を行うと、ペレット（特に下層部のペレット）は、離水室４内で十分に結晶水が分解除去されなくなるため、ペレット内部に結晶水を残存したまま、より高温の予熱室５内に持ち込まれる。この結果、予熱室５内で結晶水の急速な分解によりペレットのバースティング（爆裂）が発生する。バースティングで発生した粉によりペレット層の通気性が悪化し均一な加熱が阻害され、ペレット層の圧損が増大するなど操業が不安定化するとともに、予熱ペレットの強度が低下する。この結果、予熱室５内で発生した粉がキルン９内に持ち込まれるとともに、強度の低い予熱ペレットがキルン９内で転動により粉化するため、キルンリングが形成され、操業が継続できなくなる。したがって、上記予熱室５内でのバースティングを回避するために、結局はペレット生産速度を低下せざるを得なかった。   By the way, in order to respond to the recent increase in steel demand, further increase in the production of pellets is required. In addition, with the recent deterioration of iron ore raw materials, an increase in the blending ratio of high crystal water ore to pellets is also required. However, if the pellet production rate is simply increased or the crystal water content in the raw pellet GP is increased while maintaining the pellet production rate to meet these requirements, the atmosphere in the water separation chamber 4 When the operation is performed while maintaining the temperature as usual, the pellet (particularly the lower layer pellet) is not sufficiently decomposed and removed in the water separation chamber 4, so that the crystal water remains inside the pellet. It is brought into the hotter preheating chamber 5. As a result, bursting of the pellet occurs due to rapid decomposition of the crystal water in the preheating chamber 5. The powder generated by bursting deteriorates the air permeability of the pellet layer, hinders uniform heating, increases the pressure loss of the pellet layer, destabilizes the operation, and decreases the strength of the preheated pellet. As a result, the powder generated in the preheating chamber 5 is brought into the kiln 9 and the preheated pellets having low strength are pulverized by rolling in the kiln 9, so that a kiln ring is formed and the operation cannot be continued. Therefore, in order to avoid the bursting in the preheating chamber 5, the pellet production rate has to be reduced eventually.

また、上記ペレット増産ないしペレットへの高結晶水鉱石増配時において、予熱室バーナ２１から予熱室５内への燃料吹込み量を増加して、予熱室５内雰囲気ガス温度を上昇させ、その結果として予熱室排ガスＡの温度を上昇させて、離水室４内雰囲気温度を上昇させることで、離水室４出口における結晶水の残存量を低下させることが考えられる。しかしながら、予熱室バーナ２１の使用により、予熱室排ガスＡの温度は予熱室バーナ２１を使用していなかった当時より上昇しており、予熱室排ガスＡの温度を現状よりさらに高めることは、金属製のグレート２の耐熱温度の制約から困難である。また、仮にグレート２の材質を高級化して耐熱温度を上昇させることが可能としても、設備コストやメンテナンスコストが上昇することはもとより、離水室４内の雰囲気温度を単純に上昇させると、特にペレット増産の場合には乾燥室３で生ペレットＧＰ（特に、下層部のペレット）から付着水分が十分に除去されないまま離水室４内に持ち込まれ、従来より高い離水室４内雰囲気温度により付着水分が急速に蒸発してバースティングが発生しやすくなる問題が生じる。   Further, at the time of increasing the production of pellets or distributing high crystal water ore to the pellets, the amount of fuel injected from the preheating chamber burner 21 into the preheating chamber 5 is increased, and the atmospheric gas temperature in the preheating chamber 5 is increased. It is conceivable that the residual amount of crystal water at the outlet of the water separation chamber 4 is reduced by raising the temperature of the preheating chamber exhaust gas A and raising the atmosphere temperature in the water separation chamber 4. However, due to the use of the preheating chamber burner 21, the temperature of the preheating chamber exhaust gas A has risen from the time when the preheating chamber burner 21 was not used. It is difficult due to the limitation of the heat resistance temperature of Great 2. Even if it is possible to increase the heat resistance temperature by upgrading the material of the Great 2, it is possible to increase the facility cost and maintenance cost as well as to increase the atmospheric temperature in the water separation chamber 4 in particular. In the case of increased production, the adhering moisture is brought into the water separation chamber 4 without being sufficiently removed from the raw pellet GP (particularly, the lower layer pellet) in the drying chamber 3, and the adhering moisture is caused by the higher atmospheric temperature in the water separation chamber 4 than before. There arises a problem that bursting easily occurs and bursting is likely to occur.

したがって、上記ペレット増産ないしペレットへの高結晶水鉱石増配の要請に十分に答えられないのが現状であった。
特開平１１−３２５７４０号公報 特開２００５−６０７６２号公報 Therefore, the current situation is that the above-mentioned demand for increasing the production of pellets or increasing the distribution of high-crystal water ore to pellets cannot be fully met.
JP-A-11-325740 JP 2005-60762 A

そこで、本発明は、ペレット増産ないし高結晶水鉱石増配を確実に達成しうるペレット製造方法を提供することを目的とする。   Then, an object of this invention is to provide the pellet manufacturing method which can achieve reliably the pellet production increase or the high crystal water ore increase distribution.

請求項１に記載の発明は、鉄鉱石ペレットをトラベリング・グレートで移動させつつ、乾燥室、離水室および予熱室で順次加熱した後、キルンバーナを備えたロータリキルンで焼成するグレートキルン方式の鉄鉱石ペレット製造方法において、前記離水室の入口を基点として該離水室全長の１／３〜０．９８倍の間に複数本のバーナを設置し、該複数本のバーナから前記離水室へ気体燃料を吹き込み、該気体燃料を、前記離水室へ導入される予熱室排ガス中の残留酸素で燃焼させて、前記離水室内における、その入口近傍を除く領域の雰囲気温度を上昇させることを特徴とする鉄鉱石ペレットの製造方法である。   The invention according to claim 1 is a great kiln type iron ore which is heated in a drying kiln, a water separation chamber and a preheating chamber in sequence while moving the iron ore pellets with a traveling great and then fired in a rotary kiln equipped with a kiln burner. In the pellet manufacturing method, a plurality of burners are installed between 1/3 and 0.98 times the total length of the water separation chamber from the inlet of the water separation chamber, and gaseous fuel is supplied from the plurality of burners to the water separation chamber. Injecting and burning the gaseous fuel with residual oxygen in the exhaust gas from the preheating chamber introduced into the water separation chamber, and raising the atmospheric temperature in the region other than the vicinity of the inlet in the water separation chamber It is a manufacturing method of a pellet.

請求項２に記載の発明は、前記気体燃料の吹込み方向が、前記離水室への前記予熱室排ガスの導入方向と直交する請求項１に記載の鉄鉱石ペレットの製造方法である。 Invention of Claim 2 is a manufacturing method of the iron ore pellet of Claim 1 in which the blowing direction of the said gaseous fuel is orthogonal to the introduction direction of the said preheating chamber exhaust gas to the said water separation chamber.

請求項３に記載の発明は、前記気体燃料が、コークス炉ガス、天然ガス、石油ガス、または、これらの２種以上の混合ガスである請求項１または２に記載の鉄鉱石ペレットの製造方法である。   The invention according to claim 3 is the method for producing iron ore pellets according to claim 1 or 2, wherein the gaseous fuel is coke oven gas, natural gas, petroleum gas, or a mixed gas of two or more thereof. It is.

本発明によれば、離水室に、その入口から所定区間を避けて設置した複数本のバーナから気体燃料を吹き込んで、離水室の上記所定区間より後方の雰囲気温度のみを上昇させたことで、万一、離水室内に付着水分を残存するペレットが持ち込まれても該離水室内でバースティングが発生することが防止できるとともに、該離水室内で十分に結晶水が分解除去されるので、予熱室内でバースティングが発生することも防止できるようになった。   According to the present invention, by blowing gaseous fuel from a plurality of burners installed avoiding a predetermined section from the entrance to the water separation chamber, by raising only the ambient temperature behind the predetermined section of the water separation chamber, In the unlikely event that pellets with residual moisture remaining in the water separation chamber are brought in, bursting can be prevented from occurring in the water separation chamber, and the crystal water is sufficiently decomposed and removed in the water separation chamber. It is now possible to prevent bursting from occurring.

この結果、本発明を適用することで、ペレット増産ないし高結晶水鉱石増配が確実に達成できるようになった。   As a result, by applying the present invention, it has become possible to reliably achieve increased pellet production or increased distribution of high crystal water ore.

以下、本発明の実施の形態について図面を参照しつつ詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

〔実施形態〕
図１は本発明の実施に係るグレートキルン方式鉄鉱石ペレット製造装置の一例を示す縦断面図、図２は図１に示す製造装置の要部を示す平面図、図３は図２中の予熱室を説明するための横断面図である。ここで、本例において、離水室にバーナが追加されている点以外は、前記図４に示す従来装置の構成と同一であるので、同一部分には図４と同一の符号を付して説明を省略し、異なる点について説明する。 Embodiment
FIG. 1 is a longitudinal sectional view showing an example of a great kiln type iron ore pellet manufacturing apparatus according to an embodiment of the present invention, FIG. 2 is a plan view showing the main part of the manufacturing apparatus shown in FIG. 1, and FIG. 3 is a preheat in FIG. It is a cross-sectional view for demonstrating a chamber. Here, in this example, except that a burner is added to the water separation chamber, the configuration is the same as that of the conventional apparatus shown in FIG. Is omitted, and different points will be described.

図１〜図３に示すように、予熱室排ガスＡの温度を上昇させるために、離水室４には、気体燃料として例えばＣＯＧを離水室５内に吹き込むためのバーナ（以下、「離水室バーナ」ともいう。）３１を複数本設けている。離水室バーナ３１の燃料として、微粉炭でなく、気体燃料を採用したのは、離水室４に吹き込まれる予熱室排ガスＡの温度は４００〜４５０℃程度と低いため、微粉炭の場合は着火源がないと燃焼が継続しないのに対し、気体燃料の場合は着火源がなくても自動的に燃焼が継続することによる。また、後述のように、離水室バーナ３１を天井壁４ａに設置する場合は、微粉炭バーナを用いると、バーナフレームが長くなるため、ペレット層の最表面のペレットが過熱され、バースティングが発生しやすくなるので、この点からもバーナフレームの短い気体燃料を用いるのがよい。   As shown in FIGS. 1 to 3, in order to raise the temperature of the preheating chamber exhaust gas A, a burner (hereinafter referred to as “water separation chamber burner”) is used to blow COG into the water separation chamber 5 as gaseous fuel, for example. It is also referred to as “.” A plurality of 31 are provided. Gas fuel instead of pulverized coal is used as the fuel for the water separation chamber burner 31 because the temperature of the preheating chamber exhaust gas A blown into the water separation chamber 4 is as low as about 400 to 450 ° C. Combustion does not continue without a source, whereas in the case of gaseous fuel, combustion continues automatically even without an ignition source. As will be described later, when the water separation chamber burner 31 is installed on the ceiling wall 4a, if the pulverized coal burner is used, the burner frame becomes longer, so the pellet on the outermost surface of the pellet layer is overheated and bursting occurs. From this point of view, it is preferable to use a gas fuel having a short burner frame.

上記複数本のバーナ３１は、離水室入口４ｂを基点として（１／３）Ｌ〜０．９８Ｌ（Ｌ:離水室全長）の間に配設する。離水室入口４ｂを基点として（１／３）Ｌ未満の位置にバーナ３１を設置すると、離水室入口壁ｂ近傍の雰囲気温度が上昇し、乾燥室３内で十分に乾燥しきれずに付着水を残留したままペレットが離水室４に持ち込まれたときに、バースティングが発生しやすくなるためである。一方、離水室入口４ｂを基点として０．９８Ｌを超える位置（すなわち、離水室出口４ｃを基点として０．０２Ｌ未満の位置）にバーナ２１を設置すると、離水室出口４ｃの隔壁にバーナ２１が近づきすぎでバーナフレームからの輻射熱により該隔壁の耐火物が損傷されやすくなるためである。上記複数本のバーナ３１は、離水室入口４ｂを基点として（１／２）Ｌ〜０．９５Ｌの間に配設するのが好ましく、（１／３）Ｌ〜０．９２Ｌの間に配設するのがより好ましい。   The plurality of burners 31 are disposed between (1/3) L and 0.98L (L: total length of the water separation chamber) with the water separation chamber inlet 4b as a base point. If the burner 31 is installed at a position lower than (1/3) L from the water separation chamber inlet 4b as a base point, the ambient temperature in the vicinity of the water separation chamber inlet wall b rises and the adhering water is not sufficiently dried in the drying chamber 3. This is because bursting is likely to occur when the pellets are brought into the water separation chamber 4 while remaining. On the other hand, when the burner 21 is installed at a position exceeding 0.98L with the water separation chamber inlet 4b as a base point (that is, a position less than 0.02L with the water separation chamber outlet 4c as a base point), the burner 21 approaches the partition wall of the water separation chamber outlet 4c. This is because the refractory material of the partition wall is easily damaged by the radiant heat from the burner frame. The plurality of burners 31 are preferably disposed between (1/2) L and 0.95L with the water separation chamber inlet 4b as a base point, and are disposed between (1/3) L and 0.92L. More preferably.

また、複数本のバーナ３１は、図２および図３に示すように、離水室４の天井壁４ａに設置し、ＣＯＧ（気体燃料）の吹込み方向（本例では下向き垂直方向）が、離水室４への加熱用ガス（予熱室排ガス）の導入方向（本例では水平方向）と直交するようにするのが好ましい。これにより、複数のバーナ３１から吹き込まれたＣＯＧ（気体燃料）は、加熱用ガスと良好に混合されるので、複数本のバーナ３１を設置した領域の雰囲気温度は均一となり、ペレット層は均一に加熱され、結晶水が万遍なく分解除去されることとなる。 As shown in FIGS. 2 and 3, the plurality of burners 31 are installed on the ceiling wall 4a of the water separation chamber 4, and the blowing direction of COG (gaseous fuel) (downward vertical direction in this example) is the water separation water. It is preferable to be orthogonal to the direction of introduction of the heating gas (preheating chamber exhaust gas) into the chamber 4 (in this example, the horizontal direction). Thereby, COG (gaseous fuel) blown from the plurality of burners 31 is well mixed with the heating gas, so that the ambient temperature in the region where the plurality of burners 31 are installed is uniform, and the pellet layer is uniform. When heated, the crystal water is uniformly decomposed and removed.

また、複数本のバーナ３１は、図２に示すように、例えば離水室４の幅方向に４本、その長手方向に２本の合計８本を所定間隔をあけて並べて配置することが好ましい。このように複数本のバーナを設置することで、バーナフレームをより短くしてペレット層最表面のペレットのバースティングをより確実に防止するとともに、雰囲気温度をより均一にすることができる。   As shown in FIG. 2, the plurality of burners 31 are preferably arranged, for example, with four in the width direction of the water separation chamber 4 and two in the longitudinal direction, for a total of eight arranged at predetermined intervals. By installing a plurality of burners in this way, the burner frame can be shortened to more reliably prevent the bursting of the pellet on the outermost surface of the pellet layer, and the ambient temperature can be made more uniform.

上記のようにして、離水室４に設置した複数本のバーナ３１で離水室入口４ｂ近傍を除く離水室４内の雰囲気温度を上昇させることにより、ペレット増産ないしペレットへの高結晶水鉱石増配時においても、離水室４内でバースティングを発生させることなく、ペレットから十分に結晶水が分解除去され、予熱室５内に粉が持ち込まれること、および、予熱室５内でバースティングが発生することが確実に防止され、予熱ペレットの強度が高まる。そして、この強度の高い予熱ペレットはキルン９内で転動を受けても粉化しにくく、キルンリングの生成が防止されることとなる。   As described above, by increasing the atmospheric temperature in the water separation chamber 4 except for the vicinity of the water separation chamber inlet 4b with the plurality of burners 31 installed in the water separation chamber 4, the pellet production is increased or the high crystal water ore is distributed to the pellet. In FIG. 5, the crystallization water is sufficiently decomposed and removed from the pellet without generating bursting in the water separation chamber 4, the powder is brought into the preheating chamber 5, and bursting occurs in the preheating chamber 5. Is reliably prevented and the strength of the preheated pellets is increased. And even if this preheating pellet with high intensity | strength receives rolling in the kiln 9, it is hard to pulverize and the production | generation of a kiln ring will be prevented.

（変形例）
上記実施形態では、気体燃料としてＣＯＧを例示したが、ＣＯＧの他、天然ガス（ＬＮＧ）、石油ガス（ＬＰＧ）、または、これらの２種以上の混合ガスを用いてもよい。 (Modification)
In the above embodiment, COG is exemplified as the gaseous fuel, but natural gas (LNG), petroleum gas (LPG), or a mixture of two or more of these may be used in addition to COG.

また、上記実施形態では、複数本のバーナ３１を離水室４の天井壁４ａに設置する例を示したが、離水室４への加熱用ガス（予熱室排ガス）Ａの導入ダクトが天井壁４ａに接続されている場合、すなわち、加熱用ガスＡの導入方向が垂直下向きの場合には、気体燃料の吹込み方向が加熱用ガスＡの導入方向と直交する水平方向となるように、上記複数本のバーナ３１を離水室４の側壁に設置するのが推奨される。 Moreover, in the said embodiment, although the example which installs the several burner 31 in the ceiling wall 4a of the water separation chamber 4 was shown, the introduction duct of the heating gas (preheating chamber exhaust gas) A to the water separation chamber 4 is the ceiling wall 4a. Are connected to each other, that is, when the introduction direction of the heating gas A is vertically downward, the plurality of gas fuel injection directions are set in the horizontal direction perpendicular to the introduction direction of the heating gas A. It is recommended to install a book burner 31 on the side wall of the water separation chamber 4.

なお、上記実施形態では、複数本のバーナ３１として、離水室４の幅方向に４本、その長手方向に２本の計８本設置する例を示したが、これに限定されるものではなく、離水室４のサイズ（幅およびその長さ）や離水室バーナ３１の設置コスト等を総合的に勘案して、適宜変更しうるものである。   In the above embodiment, an example in which a total of eight burners 31 are installed as four burners 31 in the width direction of the water separation chamber 4 and two in the longitudinal direction thereof is not limited to this. The size (width and length) of the water separation chamber 4, the installation cost of the water separation chamber burner 31, and the like can be changed as appropriate.

本発明の効果を確認するため、実機の鉄鉱石ペレット製造装置において離水室（幅４．７ｍ、長さ１５．２５ｍ）に上記実施形態で述べたように、ＣＯＧを吹込むためのバーナ（１本あたりの最大ＣＯＧ吹込み流量：１２５Ｎｍ３／ｈ）を離水室入口壁から９．１５ｍ予熱室寄りの位置から離水室出口壁方向に向かって、離水室の幅方向に１．２ｍ間隔で４本、その長手方向に３．０５ｍ間隔で２本の計８本設置した。そして、ペレットの原料配合は変更せずに（すなわち、生ペレット中の結晶水含有量は一定に維持したまま）操業を行い、離水室バーナ設置前後のペレット生産速度を比較した。 In order to confirm the effect of the present invention, in the actual iron ore pellet manufacturing apparatus, as described in the above embodiment, a burner (per 1 piece) for blowing COG into the water separation chamber (width 4.7 m, length 15.25 m). The maximum COG blowing flow rate: 125 Nm 3 / h) from the water separation chamber inlet wall toward the water separation chamber outlet wall from the position near the preheating chamber to 9.15 m, four in the width direction of the water separation chamber, A total of eight of them were installed in the longitudinal direction at intervals of 3.05 m. And operation was performed without changing the raw material composition of the pellets (that is, while maintaining the crystallization water content in the raw pellets constant), and the pellet production rates before and after the water separation chamber burner were installed were compared.

その結果、離水室バーナの設置前にはペレット生産速度は最大１００００ｔ／ｄであったのが、離水室バーナの設置後には、予熱室内でバースティングを発生させず、予熱ペレットの強度を維持したままで、かつ、キルンリングを生成することなく、ペレット生産速度を１０６５０ｔ／ｄまで上昇させることが可能となり、本発明の適用によりペレットを６．５％増産できることを確認した。   As a result, the pellet production rate was 10,000 t / d at the maximum before installing the water separation chamber burner, but after the water separation chamber burner was installed, bursting was not generated in the preheating chamber, and the strength of the preheating pellet was maintained. The pellet production rate can be increased to 10650 t / d without generating a kiln ring, and it was confirmed that the production of pellets can be increased by 6.5% by applying the present invention.

本発明の実施に係るグレートキルン方式鉄鉱石ペレット製造装置の一例を示す縦断面図である。It is a longitudinal cross-sectional view which shows an example of the great kiln system iron ore pellet manufacturing apparatus which concerns on implementation of this invention. 図１に示すグレートキルン方式鉄鉱石ペレット製造装置の要部を示す平面図である。It is a top view which shows the principal part of the great kiln system iron ore pellet manufacturing apparatus shown in FIG. 図２中の離水室を説明するための横断面図である。It is a cross-sectional view for demonstrating the water separation chamber in FIG. 従来のグレートキルン方式鉄鉱石ペレット製造装置を示す縦断面図である。It is a longitudinal cross-sectional view which shows the conventional great kiln system iron ore pellet manufacturing apparatus.

符号の説明Explanation of symbols

１…グレート炉
２…トラベリング・グレート
３…乾燥室
４…離水室
４ａ…離水室天井壁
４ｂ…離水室入口
４ｃ…離水室出口
５…予熱室
９…ロータリキルン
１０…キルンバーナ
１１…アニュラクーラ
１６…離水室用風箱群
１７…離水室用吸引ファン
２１…予熱室バーナ
３１…離水室バーナ
Ａ…予熱室排ガス（加熱用ガス）
ＧＰ…生ペレット DESCRIPTION OF SYMBOLS 1 ... Great furnace 2 ... Traveling great 3 ... Drying room 4 ... Water separation room 4a ... Water separation room ceiling wall 4b ... Water separation room inlet 4c ... Water separation room exit 5 ... Preheating room 9 ... Rotary kiln 10 ... Kiln burner 11 ... Annula Laura 16 ... Water separation Room air box group 17 ... Water separation chamber suction fan 21 ... Preheating chamber burner 31 ... Water separation chamber burner A ... Preheating chamber exhaust gas (heating gas)
GP ... Raw pellet

Claims (3)

鉄鉱石ペレットをトラベリング・グレートで移動させつつ、乾燥室、離水室および予熱室で順次加熱した後、キルンバーナを備えたロータリキルンで焼成するグレートキルン方式の鉄鉱石ペレット製造方法において、
前記離水室の入口を基点として該離水室全長の１／３〜０．９８倍の間に複数本のバーナを設置し、該複数本のバーナから前記離水室へ気体燃料を吹き込み、該気体燃料を、前記離水室へ導入される予熱室排ガス中の残留酸素で燃焼させて、前記離水室内における、その入口近傍を除く領域の雰囲気温度を上昇させることを特徴とする鉄鉱石ペレットの製造方法。 In a method for producing iron ore pellets of a great kiln method in which iron ore pellets are moved by a traveling great, sequentially heated in a drying chamber, a water separation chamber and a preheating chamber and then fired in a rotary kiln equipped with a kiln burner.
A plurality of burners are installed between 1/3 and 0.98 times the total length of the water separation chamber with the inlet of the water separation chamber as a base point, and gaseous fuel is blown into the water separation chamber from the plurality of burners. Is burned with residual oxygen in the preheating chamber exhaust gas introduced into the water separation chamber, and the atmosphere temperature in the region other than the vicinity of the inlet in the water separation chamber is increased. 前記気体燃料の吹込み方向が、前記離水室への前記予熱室排ガスの導入方向と直交する請求項１に記載の鉄鉱石ペレットの製造方法。 The method for producing iron ore pellets according to claim 1, wherein a blowing direction of the gaseous fuel is orthogonal to an introduction direction of the preheating chamber exhaust gas into the water separation chamber. 前記気体燃料が、コークス炉ガス、天然ガス、石油ガス、または、これらの２種以上の混合ガスである請求項１または２に記載の鉄鉱石ペレットの製造方法。   The method for producing iron ore pellets according to claim 1 or 2, wherein the gaseous fuel is coke oven gas, natural gas, petroleum gas, or a mixed gas of two or more thereof.
JP2008084178A 2008-03-27 2008-03-27 Method for producing iron ore pellets Expired - Fee Related JP4355748B2 (en)

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