JPH06299256A - Operation of exhaust gas circulation sintering machine - Google Patents
Operation of exhaust gas circulation sintering machineInfo
- Publication number
- JPH06299256A JPH06299256A JP8630193A JP8630193A JPH06299256A JP H06299256 A JPH06299256 A JP H06299256A JP 8630193 A JP8630193 A JP 8630193A JP 8630193 A JP8630193 A JP 8630193A JP H06299256 A JPH06299256 A JP H06299256A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- water
- temp
- pallet
- sintering machine
- 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.)
- Withdrawn
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、排ガスを循環使用する
焼結機の操業方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of operating a sintering machine which circulates and uses exhaust gas.
【０００２】[0002]
【従来の技術】原料鉱石を焼結するための焼結機は、無
端状に連接されて回動するパレット上に配合材料を充填
装入し、点火炉において配合原料の表層へ点火し、下方
に連設配置されたウインドボックスからの吸気を継続し
て、パレット上の配合原料が排鉱部に達する間に充填層
全層に亘って焼結を完了させるもので、得られる焼結鉱
の特性を高めると共に、燃料コークスの原単位の低減、
生産性の向上等の操業の改善が図られている。2. Description of the Related Art A sintering machine for sintering a raw material ore charges a compounding material on a pallet which is connected endlessly and rotates, ignites the surface layer of the compounding raw material in an ignition furnace, and lowers it. The continuous intake of air from the windboxes that are continuously installed to complete the sintering of the entire packed bed while the mixed raw materials on the pallet reach the effluent section. While improving the characteristics, reducing the basic unit of fuel coke,
Operational improvements such as productivity improvements are being made.
【０００３】例えば、特開昭４９−１１７３０４号公
報、特開昭４９−１２０９０５号公報には、粉鉱石を焼
結製団する焼結機の操業方法として、燃焼帯の下方に吸
引するためのガス吸引排気系を機長方向に複数分割し、
排ガスの一部または全部を再循環させる操業法が開示さ
れており、これによって、排ガスの顕熱回収や排ガス量
の減少化を達成している。For example, JP-A-49-117304 and JP-A-49-120905 disclose, as a method of operating a sintering machine that sinters powdered ore, to suck the ore below a combustion zone. Divide the gas suction / exhaust system into multiple units in the machine direction,
An operation method is disclosed in which part or all of exhaust gas is recirculated, whereby sensible heat recovery of exhaust gas and reduction of exhaust gas amount are achieved.
【０００４】原料の焼結を早めるためには、充填層上方
の熱風を充填層の間隙を通して下方に効率良く吸引する
必要があるが、本発明者等は排ガス循環方式による焼結
機の操業においては、従来の外気吸引の場合と比べ排ガ
ス温度が高いため、焼結体の冷却効果が低くなり、充填
層のうち焼結が完了した部分と未焼結の配合原料間に形
成される赤熱帯の厚みが拡大することを新たに見出し
た。このように、排ガス循環方式の場合、焼成中の圧力
損失が高まり吸引速度を減少させ、生産性向上の阻害要
因となっている。In order to accelerate the sintering of the raw materials, it is necessary to efficiently suck the hot air above the packed bed downward through the gaps in the packed bed. Since the exhaust gas temperature is higher than in the case of conventional outside air suction, the cooling effect of the sintered body is reduced, and the red tropical zone formed between the part of the packed bed where sintering is completed and the unsintered compounded raw material It was newly found that the thickness of the As described above, in the case of the exhaust gas circulation system, the pressure loss during firing increases and the suction speed decreases, which is an obstacle to improvement in productivity.
【０００５】この対策として、例えば、特開昭４９−５
８０４号公報，また特開昭４９−２７４０３号公報に開
示されたように、充填層上面から散水し、これによっ
て、冷却効果を高めて赤熱帯を薄くし、ブロアによる吸
引効果を高めることが考えられる。As a countermeasure, for example, Japanese Patent Laid-Open No. 49-5
As disclosed in Japanese Patent No. 804 and Japanese Patent Laid-Open No. 49-27403, it is considered that water is sprinkled from the upper surface of the packed bed, thereby enhancing the cooling effect and thinning the red tropical zone, and enhancing the suction effect by the blower. To be
【０００６】しかしながら、単に充填層全体に散水した
のでは、赤熱帯で蒸発した水が下方に吸引されて湿潤帯
で凝結し、湿潤帯を拡大して逆に通気性を疎外したり、
また、散水された水が充分に蒸発せずに焼結層中に残留
して通気性を悪くする原因ともなる。However, if water is simply sprinkled over the entire packed bed, the water evaporated in the red tropics is sucked downward and condensed in the wet zone, and the wet zone is expanded to contradict the air permeability.
In addition, the sprinkled water may not evaporate sufficiently and may remain in the sintered layer to deteriorate the air permeability.
【０００７】[0007]
【発明が解決しようとする課題】本発明の目的は、湿潤
帯の拡大及び焼結体中の残留を引き起こさないための散
水条件を見出し、これによって排ガス循環焼結機の操業
効率をさらに向上させることにある。DISCLOSURE OF THE INVENTION The object of the present invention is to find out the watering conditions for preventing the expansion of the wet zone and the residual in the sintered body, thereby further improving the operating efficiency of the exhaust gas circulating sintering machine. Especially.
【０００８】[0008]
【課題を解決するための手段】本発明は、散布水の湿潤
帯での凝結または焼結機中の残留による通気性の低下
は、循環される排ガスの温度とその温度における散水量
とによって制御できるという知見を基になされたもの
で、散水の領域をウインドボックスから吸引された排ガ
ス温度が１００℃以上の範囲とし、かつ散水量をＹ1 ＝
ａ1 Ｘ＋ｂ1 （ａ1は０．７〜１．０、ｂ1 は０〜５
０）表される直線と、Ｙ2 ＝ａ2 Ｘ＋ｂ2 （ａ2 は０．
６〜０．９、ｂ2 は−４０〜−１０）で表される直線の
間の範囲とすることを特徴とする。SUMMARY OF THE INVENTION According to the present invention, deterioration of air permeability due to condensation in a wet zone of spray water or residual in a sintering machine is controlled by the temperature of exhaust gas circulated and the amount of water sprayed at that temperature. Based on the knowledge that it can be done, the sprinkling area is set such that the temperature of the exhaust gas sucked from the wind box is 100 ° C. or higher, and the sprinkling amount is Y 1 =
a 1 X + b 1 (a 1 is 0.7 to 1.0, b 1 is 0 to 5)
0) and a straight line represented by Y 2 = a 2 X + b 2 (a 2 is 0.
6 to 0.9 and b 2 are in the range between the straight lines represented by −40 to −10).
【０００９】散水量が少ない場合には、赤熱帯は十分に
冷却されず拡大したままであり、また、散水量が多い場
合には冷却速度が速すぎて、焼結鉱中のガラス質の部分
などにクラックが発生し冷間強度が低下する。また水が
十分に蒸発せず、焼結鉱中に残留し、溶鉱炉での燃料コ
ストが増加する。When the amount of water sprinkled is small, the red tropics are not sufficiently cooled and remain expanded, and when the amount of water sprinkled is large, the cooling rate is too fast and the vitreous part in the sinter ore. The cracks occur in the steel and the cold strength is reduced. In addition, water does not evaporate sufficiently and remains in the sintered ore, which increases the fuel cost in the blast furnace.
【００１０】排ガス温度の検出は、機長方向に複数に分
割されたウインドボックス毎に温度センサを設けて行
い、散水領域は、各ウインドボックスに対応するように
パレット上部に複数の散水ノズルを設け、支管毎の弁を
開閉することによって行う。また、散水量は上記制御式
を記憶させた制御装置によって散水ノズルの開度をコン
トロールすることによって行うことができる。The temperature of the exhaust gas is detected by providing a temperature sensor for each wind box divided into a plurality in the machine length direction, and in the water spray area, a plurality of water spray nozzles are provided at the upper part of the pallet so as to correspond to each wind box. This is done by opening and closing the valve for each branch pipe. In addition, the amount of water spray can be performed by controlling the opening of the water spray nozzle by a controller that stores the above control formula.
【００１１】[0011]
【作用】排ガス温度が１００℃以上の領域に、上記条件
式に適合した範囲の量を散水することによって、散布水
は焼結鉱の間隙を浸透して赤熱帯に達し、ここで赤熱帯
と接触して赤熱帯を冷却する。これによって、赤熱帯の
領域はおよそ排ガスを循環させる前の状態となる。また
赤熱帯で熱交換した散布水は水蒸気となり、そのまま凝
固することなく排ガスと共に下方に吸引され、焼結鉱中
の間隙あるいは湿潤帯中に残留することなくすべて排出
される。By spraying water in an area where the exhaust gas temperature is 100 ° C. or higher, the spray water permeates the pores of the sinter and reaches the red tropics, where it is called red tropics. Contact to cool the red tropics. As a result, the region of the red tropics is approximately in the state before the exhaust gas is circulated. Also, the sprayed water that has undergone heat exchange in the red tropics becomes water vapor, is sucked downward together with the exhaust gas without solidifying as it is, and is completely discharged without remaining in the gaps or wet zones in the sintered ore.
【００１２】[0012]
【実施例】図１は本発明を適用する焼結機を示す。FIG. 1 shows a sintering machine to which the present invention is applied.
【００１３】同図において、１は焼結機Ａの上面に配置
された排ガス循環用のフードを示し、フード１内には散
水ノズル２が設けられている。焼結機Ａの下方には、焼
結機Ａの長手方向に３０個に分割された排ガス吸引用の
ウインドボックス３が設けられ、各分割ボックス毎に温
度センサ４が配置されている。ウインドボックス３は、
焼結機Ａ前部の排気系５、中央部の排気系６、先端部の
排気系７にそれぞれ接続され、このうち排気系５と排気
系７とは、排ガス循環用のフード１に接続され、循環ブ
ロワ８によって焼結機Ａ内に排ガスが循環される。In FIG. 1, reference numeral 1 denotes a hood for circulating exhaust gas arranged on the upper surface of the sintering machine A, and a water spray nozzle 2 is provided in the hood 1. Below the sintering machine A, a window box 3 for exhaust gas suction, which is divided into 30 pieces in the longitudinal direction of the sintering machine A, is provided, and a temperature sensor 4 is arranged in each divided box. Windbox 3
The exhaust system 5 at the front part of the sintering machine A, the exhaust system 6 at the center part, and the exhaust system 7 at the tip part are respectively connected. Of these, the exhaust system 5 and the exhaust system 7 are connected to the hood 1 for exhaust gas circulation. The exhaust gas is circulated in the sintering machine A by the circulation blower 8.
【００１４】ウインドボックス３の温度センサ４によっ
て各分割ボックス毎に排ガスの温度が測定され、この測
定結果が図示しない制御装置に送られて、排ガスが１０
０℃以上の領域にのみ散水するように散水ノズル２が開
閉される。The temperature sensor 4 of the wind box 3 measures the temperature of the exhaust gas for each divided box, and the measurement result is sent to a controller (not shown) so that the exhaust gas 10
The water spray nozzle 2 is opened and closed so as to spray water only in the region of 0 ° C. or higher.
【００１５】図２は、１００℃以上の領域に供給される
排ガス温度と散水量との関係を示すグラフである。FIG. 2 is a graph showing the relationship between the temperature of the exhaust gas supplied to the region above 100 ° C. and the amount of water sprayed.
【００１６】同図に示すように、焼結鉱１トン当りの散
水量は、Ｙ1 ＝ａ1 Ｘ＋ｂ1 で表される直線とＹ2 ＝ａ
2 Ｘ＋ｂで表される直線（ここで、ａ1 は０．７〜１．
０、ｂ1 は０〜５０、ａ2 は０．６〜０．９、ｂ2 は−
４０〜−１０）の範囲となるように自動制御される。例
えば、排ガス温度が１００℃の場合、２０〜１５０ｌ／
トンの範囲、また２００℃の場合、８０〜２５０ｌ／ト
ンの範囲に収める必要がある。As shown in the figure, the amount of water sprinkled per ton of sintered ore is expressed by a straight line represented by Y 1 = a 1 X + b 1 and Y 2 = a.
A straight line represented by 2 X + b (where a 1 is 0.7 to 1 .
0, b 1 is 0 to 50, a 2 is 0.6 to 0.9, and b 2 is-.
It is automatically controlled to fall within the range of 40 to -10). For example, when the exhaust gas temperature is 100 ° C., 20 to 150 l /
In the range of tons, and in the case of 200 ° C., it is necessary to set in the range of 80 to 250 l / ton.
【００１７】図３は散水による赤熱帯の冷却状況を説明
するための説明図で、１０は焼結原料、１１は湿潤帯、
１２は赤熱帯、１３は焼結鉱である。FIG. 3 is an explanatory view for explaining the cooling condition of the red tropics by watering, 10 is a sintering raw material, 11 is a wet zone,
12 is red tropics and 13 is sinter.
【００１８】同図において、排ガス循環前には図中一点
鎖線で示す位置であった赤熱帯１２の範囲が、排ガスを
循環させることによって、破線に示すように上部へ移動
し赤熱帯１２の領域が拡大する。In the figure, the range of the red tropical zone 12 which was the position shown by the one-dot chain line in the figure before the exhaust gas circulation moves to the upper part as shown by the broken line by circulating the exhaust gas, and the region of the red tropical zone 12 is shown. Expands.
【００１９】本発明により、排ガス温度が１００℃以上
の領域に、上記条件式に適合した範囲の量を散水するこ
とによって、散布水は焼結鉱１３の間隙を浸透して赤熱
帯１２に達し、ここで赤熱帯１２と接触して赤熱帯１２
を冷却する。これによって、赤熱帯１２の領域は太い実
線で示すように、略排ガスを循環させる前の状態とな
る。According to the present invention, by spraying the amount of the exhaust gas temperature in the range of 100 ° C. or higher in the range suitable for the above conditional expression, the sprayed water permeates the gaps of the sinter 13 and reaches the red tropical zone 12. , Here, in contact with Red Tropical 12, Red Tropical 12
To cool. As a result, the region of the red tropical zone 12 is in a state before the exhaust gas is circulated, as indicated by the thick solid line.
【００２０】また赤熱帯１２で熱交換した散布水は上記
範囲である限り、その殆どが水蒸気となり、凝固するこ
となく排ガスと共に下方に吸引され、焼結鉱１３中の間
隙あるいは湿潤帯１１中に残留することなくすべて排出
されることとなる。As long as the sprayed water that has undergone heat exchange in the red tropical zone 12 is in the above range, most of it becomes steam, which is sucked downward together with the exhaust gas without solidifying and enters the gap in the sinter 13 or the wet zone 11. All will be discharged without remaining.
【００２１】上記装置を用い、造粒水分６．２％、コー
クス使用量３．０％で操業試験を行ったところ、循環ガ
ス温度は１５０℃で、３０個に分割されたウインドボッ
クス３のうち、給鉱側から数えて２０番〜２７番の排ガ
ス温度が１００℃を超えていた。これに対応する散水ノ
ズル２を開け、１１０ｌ／トンとなるように散水した。Using the above apparatus, an operation test was conducted with a granulation water content of 6.2% and a coke usage of 3.0%. The circulating gas temperature was 150 ° C. and the wind box 3 was divided into 30 pieces. The exhaust gas temperature of No. 20 to No. 27 counted from the mine side exceeded 100 ° C. The water spray nozzle 2 corresponding to this was opened, and water was sprayed at 110 l / ton.
【００２２】これによって、散水を施さない従来の製法
と比べ赤熱帯の冷却が促進され、生産性が約１割向上
し、また還元粉化率も約１．５％改善された。As a result, the cooling of the red tropics was promoted, the productivity was improved by about 10%, and the reduction pulverization rate was also improved by about 1.5% as compared with the conventional production method in which water was not sprinkled.
【００２３】[0023]
【発明の効果】本発明によって以下の効果を奏すること
ができる。According to the present invention, the following effects can be obtained.
【００２４】（１）散布水の湿潤帯での凝結または焼結
鉱中の残留を起こすことなく、赤熱帯を効果的に冷却す
ることによって通気性が向上し、焼結鉱の生産性を向上
させることができる。(1) By effectively cooling the red tropics without causing condensation in the wet zone of the sprayed water or remaining in the sinter, the air permeability is improved and the sinter productivity is improved. Can be made.
【００２５】（２）赤熱時間が短縮されることによっ
て、冷却過程でのマグナイトの酸化が抑制され、還元粉
化率が改善される。(2) By reducing the red heat time, the oxidation of magnite in the cooling process is suppressed, and the reduction powdering rate is improved.
【００２６】（３）次処理行程のクーラーでの冷却代を
緩和でき、クーラーの電力コストを削減できる。(3) The cooling cost in the cooler in the next processing step can be relaxed, and the power cost of the cooler can be reduced.
【図１】 本発明を適用する焼結機を示す図である。FIG. 1 is a diagram showing a sintering machine to which the present invention is applied.
【図２】 排ガス温度と散水量との関係を示すグラフで
ある。FIG. 2 is a graph showing the relationship between exhaust gas temperature and water sprinkling amount.
【図３】 焼結反応の進行を示す説明図である。FIG. 3 is an explanatory diagram showing the progress of a sintering reaction.
１ 排ガス循環用フード ２ 散水ノズル ３ ウインドボックス ４ 温度センサ ５ 前部の排気系 ６ 中央部の排気系 ７ 先端部の排気系 ８ 循環ブロワ １０ 焼結原料 １１ 湿潤帯 １２ 赤熱帯 １３ 焼結鉱 Ａ 焼結機 1 Exhaust gas circulation hood 2 Sprinkling nozzle 3 Windbox 4 Temperature sensor 5 Front exhaust system 6 Central exhaust system 7 Tip exhaust system 8 Circulation blower 10 Sintering raw material 11 Wet zone 12 Red tropical zone 13 Sintered ore A Sintering machine
Claims (1)
パレット上に設置したフードから焼成中原料に吹き込む
際に、パレット上方から焼結鉱に散水する排ガス循環焼
結機の操業法であって、散水の領域をウインドボックス
から吸引された排ガス温度が１００℃以上である範囲と
し、かつ散水量を次式１で表される直線と式２で表され
る直線の間の範囲とする排ガス循環焼結機の操業方法。 Ｙ1 ＝ａ1 Ｘ＋ｂ1 ・・・式１ Ｙ2 ＝ａ2 Ｘ＋ｂ2 ・・・式２ ここで、Ｘは排気ガス温度（℃）、Ｙは温度Ｘのときの
鉄鉱石生産量１トン当りの総散水量（ｌ／トン） また、 ａ1 は０．７〜１．０ ｂ1 は ０〜５０ ａ2 は０．６〜０．９ ｂ2 は−４０〜−１０1. A method of operating an exhaust gas circulation sintering machine, which sprays exhaust gas sucked from below a firing pallet onto a raw material during firing from a hood installed on the pallet. Exhaust gas circulation sintering in which the temperature range of the exhaust gas sucked from the wind box is 100 ° C. or higher and the water spray amount is in the range between the straight line expressed by the following formula 1 and the straight line expressed by the following formula 2. How to operate the machine. Y 1 = a 1 X + b 1 ... Equation 1 Y 2 = a 2 X + b 2 ... Equation 2 Here, X is the exhaust gas temperature (° C.), and Y is the iron ore production amount per ton when the temperature is X. the total watering amount of (l / ton) addition, a 1 is 0.7 to 1.0 b 1 is 0 to 50 a 2 is 0.6 to 0.9 b 2 is -40-10
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8630193A JPH06299256A (en) | 1993-04-13 | 1993-04-13 | Operation of exhaust gas circulation sintering machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8630193A JPH06299256A (en) | 1993-04-13 | 1993-04-13 | Operation of exhaust gas circulation sintering machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06299256A true JPH06299256A (en) | 1994-10-25 |
Family
ID=13883020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8630193A Withdrawn JPH06299256A (en) | 1993-04-13 | 1993-04-13 | Operation of exhaust gas circulation sintering machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06299256A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103644733A (en) * | 2013-11-27 | 2014-03-19 | 攀钢集团攀枝花钢钒有限公司 | Hot air sintering device and method |
| JP2015183287A (en) * | 2014-03-26 | 2015-10-22 | 新日鐵住金株式会社 | Method of manufacturing sintered ore |
| JP2020529576A (en) * | 2017-08-02 | 2020-10-08 | ポスコＰｏｓｃｏ | Sintering equipment and sintering method using this |
| CN112393599A (en) * | 2020-04-27 | 2021-02-23 | 中冶长天国际工程有限责任公司 | Tangential curtain cooling type gas injection sintering machine and control method thereof |
-
1993
- 1993-04-13 JP JP8630193A patent/JPH06299256A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103644733A (en) * | 2013-11-27 | 2014-03-19 | 攀钢集团攀枝花钢钒有限公司 | Hot air sintering device and method |
| CN103644733B (en) * | 2013-11-27 | 2015-09-30 | 攀钢集团攀枝花钢钒有限公司 | A kind of hot gas sintering device and sintering method |
| JP2015183287A (en) * | 2014-03-26 | 2015-10-22 | 新日鐵住金株式会社 | Method of manufacturing sintered ore |
| JP2020529576A (en) * | 2017-08-02 | 2020-10-08 | ポスコＰｏｓｃｏ | Sintering equipment and sintering method using this |
| CN112393599A (en) * | 2020-04-27 | 2021-02-23 | 中冶长天国际工程有限责任公司 | Tangential curtain cooling type gas injection sintering machine and control method thereof |
| CN112393599B (en) * | 2020-04-27 | 2022-06-07 | 中冶长天国际工程有限责任公司 | Tangential curtain cooling type gas injection sintering machine and control method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20000704 |