JPS63171809A - Control method for furnace heat in oxygen blast furnace - Google Patents
Control method for furnace heat in oxygen blast furnaceInfo
- Publication number
- JPS63171809A JPS63171809A JP186587A JP186587A JPS63171809A JP S63171809 A JPS63171809 A JP S63171809A JP 186587 A JP186587 A JP 186587A JP 186587 A JP186587 A JP 186587A JP S63171809 A JPS63171809 A JP S63171809A
- Authority
- JP
- Japan
- Prior art keywords
- heat
- furnace
- temp
- molten iron
- temperature
- 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
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims description 23
- 239000001301 oxygen Substances 0.000 title claims description 23
- 229910052760 oxygen Inorganic materials 0.000 title claims description 23
- 238000000034 method Methods 0.000 title claims description 11
- 238000010079 rubber tapping Methods 0.000 claims abstract description 13
- 239000007789 gas Substances 0.000 claims description 41
- 239000002184 metal Substances 0.000 claims description 27
- 238000007664 blowing Methods 0.000 abstract description 8
- 239000002893 slag Substances 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 18
- 229910052742 iron Inorganic materials 0.000 abstract 9
- 239000003245 coal Substances 0.000 description 4
- 239000000571 coke Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Manufacture Of Iron (AREA)
Abstract
Description
【発明の詳細な説明】
「発明の目的」
（産業上の利用分野）
この発明は製鉄用高炉、特に酸素高炉の炉熱制御方法に
関するものである。DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION (Field of Industrial Application) This invention relates to a furnace heat control method for iron-making blast furnaces, particularly oxygen blast furnaces.
（従来技術）
現在の実用大型高炉の殆んどが、羽口からの送風は高温
空気が主体であり、若干の酸素富化は行なわれるものの
高炉内を通過するガスの５７〜６２％程度がＮ８であり
、送風温度も略限界に達している現状において、昨今、
化学工業用ガスを炉頂ガスとして得る製銑方法として酸
素高炉が提案されている。(Prior art) In most of the current large-scale blast furnaces, the blast from the tuyeres is mainly high-temperature air, and although some oxygen enrichment is performed, about 57 to 62% of the gas passing through the blast furnace is In the current situation where the air temperature is N8 and the air temperature has almost reached its limit, these days,
Oxygen blast furnaces have been proposed as a method of ironmaking to obtain chemical industrial gases as top gas.
例えば特開昭６０−１５９１０４には、羽口から酸素と
羽口先の温度調節剤として水もしくはＣＯ□ガスを吹き
込み、シャフトから装入物を予熱するための予熱ガスを
吹込む酸素高炉の操業方法が提示されている。しかし乍
らこの場合のシャフトからの予熱ガスの吹き込みは酸素
高炉特有の現象であるＮ２不在によるガス量の減に伴な
う炉上部の温度補償が目的として採られたものであり、
酸素高炉はまだ歴史が浅く安定操業を続行するための炉
熱の制御方法は未だ提案されていない。For example, JP-A No. 60-159104 discloses a method for operating an oxygen blast furnace in which oxygen is injected through the tuyere, water or CO□ gas is injected as a temperature control agent at the tip of the tuyere, and preheating gas is injected into the shaft to preheat the charge. is presented. However, in this case, the injection of preheating gas from the shaft was adopted for the purpose of compensating the temperature in the upper part of the furnace due to the decrease in gas amount due to the absence of N2, which is a phenomenon unique to oxygen blast furnaces.
The history of oxygen blast furnaces is still young, and no method for controlling furnace heat to maintain stable operation has yet been proposed.
（発明が解決しようとする問題点）
本発明は上述したような酸素高炉のこのような現状に鑑
み創案されたものであり従来高炉炉上部における単なる
熱補充と考えられていた予熱吹き込みガスを炉熱コント
ロールの主因子として簡単な計算法により迅速に対処せ
しめる方法を提供することを目的とする。(Problems to be Solved by the Invention) The present invention was devised in view of the above-mentioned current situation of oxygen blast furnaces, and uses preheated blowing gas, which was conventionally considered to be a mere heat supplement in the upper part of the blast furnace, to the furnace. The purpose is to provide a method to quickly deal with the main factor of heat control using a simple calculation method.
「発明の構成」
（問題を解決するための手段）
上記目的を達成するために本発明者等は、（１） 出
銑時の溶銑の標準温度を設定し、該標準温度と出銑時の
溶銑温度の測定値の差に基づき、溶銑の温度補償熱をシ
ャフトから炉内に吹き込む予熱ガスにより供給すること
を特徴とする酸素高炉の炉熱制御方法。"Structure of the invention" (Means for solving the problem) In order to achieve the above object, the present inventors (1) set a standard temperature of hot metal during tapping, and A furnace heat control method for an oxygen blast furnace characterized by supplying temperature-compensating heat of hot metal by preheating gas blown into the furnace from a shaft based on a difference in measured values of hot metal temperature.
（２） 出銑時の溶銑の標準温度を設定し、該標準温
度と出銑時の溶銑温度の測定値の差に基づく制御におい
てこの出銑時の溶銑温度を各々の出銑口からの溶銑温度
とし、吹き込む予熱ガスの熱量を出銑口毎に制御し、円
周バランスを図ることを特徴とする請求範囲第１項記載
の酸素高炉の炉熱制御方法。(2) A standard temperature of hot metal during tapping is set, and in control based on the difference between the standard temperature and the measured value of the hot metal temperature during tapping, this hot metal temperature during tapping is adjusted to the temperature of hot metal from each taphole. The furnace heat control method for an oxygen blast furnace according to claim 1, characterized in that the temperature and the amount of heat of the preheated gas blown in are controlled for each tap hole to achieve circumferential balance.
を伎に提案する、
本発明方法の採用により炉熱の制御がシステマチックに
しかも簡略化される。By adopting the method of the present invention, the control of furnace heat can be systematically and simplified.
（作用）
本発明において酸素高炉とは、羽口から酸素濃度４０％
以上の常温のガスを吹き込み、且つシャフトから予熱ガ
スを吹き込んで操業する高炉のことである。(Function) In the present invention, an oxygen blast furnace refers to an oxygen concentration of 40% from the tuyere.
This is a blast furnace that operates by blowing the above-mentioned gas at room temperature and preheating gas from a shaft.
前述′したようにシャフトから予熱ガスの吹き込みをし
ない場合、ガス量の不足に伴ない７００℃以上のガス還
元領域が狭少化し炉上部の熱不足を招来するのは酸素高
炉時をの現象であるが、逆にシャフトから吹き込まれる
ガスの顕熱は炉内装入物の還元帯域の大きさ、鉱石の還
元速度、最終的には溶銑温度までに大きな影響力を与え
る。従ってシャフトから吹き込まれる予熱ガスの温度、
量は炉熱のコトロールに極めて敏感に作用する。そこで
恒常的に吹き込まれる予熱ガスの総熱量を、炉熱制御と
しての溶銑温度の制御のために変更しようとするのが本
発明の基本であって、溶銑温度を高炉１本として考えた
のが請求範囲の第１項であり、各出銑日毎の溶銑温度と
してとらえたのが請求範囲第２項である。従ってシャフ
トからのガスの吹き込み量、吹き込み温度を各ノズル毎
回−割合で増減せしめるのが第１項であり、出銑ロ毎ニ
ソノ上部の予熱ガス吹き込みノズルからの総熱量に差を
つけてキメの細かい制御を行なうのが第２項である。出
銑口毎に温度の差が生ずるのは装入物の分布に乱れが生
じ、特定の方向に鉱石や、コークスが偏在しておりこの
ためにガスが均一に流れず、炉の円周方向に還元状態の
バラツキがある証拠である。As mentioned above, if preheating gas is not injected from the shaft, the gas reduction area above 700°C will become narrow due to insufficient gas volume, leading to a lack of heat in the upper part of the furnace, which is a phenomenon that occurs during oxygen blast furnaces. However, on the contrary, the sensible heat of the gas blown in from the shaft has a large influence on the size of the reduction zone of the contents in the furnace, the reduction rate of ore, and ultimately the temperature of hot metal. Therefore, the temperature of the preheated gas blown from the shaft,
The quantity is extremely sensitive to the control of furnace heat. Therefore, the basis of the present invention is to change the total amount of heat of the preheating gas that is constantly blown in to control the hot metal temperature as a furnace heat control. The first claim is the first claim, and the second claim is taken as the hot metal temperature for each tapping date. Therefore, the first step is to increase/decrease the amount of gas blown from the shaft and the blowing temperature to each nozzle by a percentage each time. The second term is for fine control. The difference in temperature between tapholes occurs because the distribution of the charge is disturbed, and ore and coke are unevenly distributed in a specific direction, which prevents gas from flowing uniformly and This is evidence that there is variation in the reduction state.
（実施例）
溶銑温度１０℃を補償する予熱ガス量は下記のようにし
て求めた。溶銑と生成スラグの合計の熱容量（各々の比
熱並びに溶銑ｌトン当りの生成量から計算する） ２９
５Ｋｃａｌ／Ｔ℃を溶銑温度１０℃に換算し、更に１０
００℃の予熱ガスの内、炉下部の熱バランスに有効な８
００℃以上の熱量と予熱ガスの比熱とからこの熱容量に
対応する吹き込み量４５Ｎｍ３／Ｔを得た。(Example) The amount of preheating gas to compensate for the hot metal temperature of 10°C was determined as follows. Total heat capacity of hot metal and produced slag (calculated from the specific heat of each and the amount produced per ton of hot metal) 29
Convert 5Kcal/T°C to the hot metal temperature of 10°C, and further 10
Among the preheating gases at 00℃, 8 are effective for the heat balance in the lower part of the furnace.
A blowing amount of 45 Nm 3 /T corresponding to this heat capacity was obtained from the heat amount of 00° C. or higher and the specific heat of the preheated gas.
実施例１゜
炉容２８２８ｒｄ、操業度３．ＯＴ／日／ｒｒｒ、コー
クス比３５０ｋｇ／Ｔ、微粉炭比３００ｋｇ／Ｔ、酸素
量３３０ Ｎ＋ｗ”／ Ｔ、蒸気７５ｋｇ／Ｔ、予熱ガ
ス量（１０００℃） ２７ ＯＮｍ’／Ｔ、溶銑標準温
度１５００℃の基準操業において、第１図は炉熱制御に
水蒸気を使用（１０℃の昇温当り一３ｋｇ／Ｔ）したＡ
と、本発明のＢを比較しプロットしたものである。何れ
の場合も標準温度を１５００’ｅに維持することは可能
であるが、バラツキは本発明の場合が温かに少ないこと
が判る。Example 1゜Furnace volume: 2828rd, operating rate: 3. OT/day/rrr, coke ratio 350kg/T, pulverized coal ratio 300kg/T, oxygen amount 330 N+w''/T, steam 75kg/T, preheating gas amount (1000℃) 27 ONm'/T, hot metal standard temperature 1500℃ In the standard operation of
and B of the present invention are compared and plotted. Although it is possible to maintain the standard temperature at 1500'e in either case, it can be seen that the variation is smaller in the case of the present invention.
実施例２゜
使用した酸素高炉、基準操業条件、溶銑標準温度は実施
例１と同一条件で出銑口毎の制御を行った。Example 2 The oxygen blast furnace used, the standard operating conditions, and the standard hot metal temperature were the same as in Example 1, and each taphole was controlled.
４本の出銑口、各出銑口毎の溶銑温度の１日平均が−１
はｔ ５０１ ”Ｃ１ｔ’ｈ２は１５１０℃、隘３は１
４９０℃、！ｌｈ４は１４８５℃の時、シャフトのガス
吹き込み０１６本を出銑口の位置別に４グループに分け
て、隘１出銑ログループは基準操業時と同一ガス量のま
まとし、他の出銑ログループはｉｏ℃＝４５Ｎｍ’／Ｔ
の割合で吹き込み量を変更し、他の出銑ログループは標
準操業時のガス量を１００とした場合、磁２は８３％、
１１ｈ３は１１７％、隘４は１２５％の供給量に変更し
た。4 tapholes, daily average of hot metal temperature for each taphole is -1
is t 501 "C1t'h2 is 1510℃, 隘3 is 1
490℃! At lh4, when the temperature is 1485℃, the shaft gas blowing holes are divided into 4 groups according to the position of the tap hole. is io℃=45Nm'/T
By changing the blowing amount at the rate of
The supply amount was changed to 117% for 11h3 and 125% for No.4.
翌日の各出銑口毎の溶銑温度の平均は、１ｌｈｌは１５
００℃、Ｎ１２は１５０２℃、！ｌｈ３は１４９８℃、
隘４は１４９７℃であった。The average hot metal temperature for each taphole on the next day is 1lhl = 15
00℃, N12 is 1502℃,! lh3 is 1498℃,
Room 4 was 1497°C.
第２図は本発明を実施する酸素高炉の代表的なフローの
概略図である。高炉１に炉頂から装入物が装入される。FIG. 2 is a schematic diagram of a typical flow of an oxygen blast furnace implementing the present invention. A charge is charged into the blast furnace 1 from the top of the furnace.
炉内ガスは炉頂ガス清浄機構２を経てガスホルダー３に
送られるが途中分岐されてブースター４を通り予熱ガス
発生装置５で高温のガスを生成しシャフトに設けたガス
吹込み口６から炉内に吹き込まれる。又、一部はブース
ター４′を通って羽口先温度調整ガスとして、羽口９よ
り炉内に吹込まれる。一方、酸素源７からは前記予熱ガ
ス発生装置５と羽口９へ酸素が送られるが、通常はコー
クスの代替の一部として微粉炭貯槽８からの微粉炭も併
せて羽口９から炉内に吹き込まれる。The gas in the furnace is sent to the gas holder 3 via the furnace top gas cleaning mechanism 2, but it is branched on the way, passes through the booster 4, generates high-temperature gas in the preheating gas generator 5, and is sent to the furnace from the gas inlet 6 provided on the shaft. blown inside. A part of the gas passes through the booster 4' and is blown into the furnace from the tuyere 9 as a tuyere tip temperature adjusting gas. On the other hand, oxygen is sent from the oxygen source 7 to the preheating gas generator 5 and the tuyere 9, but normally pulverized coal from the pulverized coal storage tank 8 is also sent from the tuyere 9 into the furnace as part of coke replacement. is blown into.
「発明の効果」
以上詳述したように本発明による場合は、高炉全体とし
て又は出銑口毎の溶銑温度と、予め設定した標準溶銑温
度との差を、シャフトからの予熱ガスの熱量で補正する
ものであり、羽口における操業条件の変動、装入物の性
状変更等を伴なう必要がなく比較的簡単に標準操業の回
復が可能である。"Effects of the Invention" As detailed above, in the case of the present invention, the difference between the hot metal temperature of the entire blast furnace or each tap hole and the preset standard hot metal temperature is corrected by the amount of heat of the preheated gas from the shaft. Therefore, it is possible to restore standard operation relatively easily without changing the operating conditions at the tuyere or changing the properties of the charge.
第１図は溶銑温度の制御に本発明を利用した操業例と比
較例を対比して示すものであり、第２図は本発明の実施
される酸素高炉の代表的な操業フローを示すものである
。
１：高炉
２：炉頂ガス清浄機構
３：ガスホルダー
４ニブ−スター
４′ニブ−スター
５：予熱ガス発生装置
６：ガス吹込みロ
ア：酸素源
ａｈａ粉炭貯槽
９：羽目Figure 1 shows a comparative example of an operation using the present invention to control hot metal temperature, and Figure 2 shows a typical operation flow of an oxygen blast furnace in which the present invention is implemented. be. 1: Blast furnace 2: Furnace top gas cleaning mechanism 3: Gas holder 4 Nib-star 4' Nib-star 5: Preheating gas generator 6: Gas blowing lower: Oxygen source aha pulverized coal storage tank 9: Winder
Claims (2)
出銑時の溶銑温度の測定値の差に基づき、溶銑の温度補
償熱をシャフトから炉内に吹き込む予熱ガスにより供給
することを特徴とする酸素高炉の炉熱制御方法。(1) Set the standard temperature of hot metal during tapping, and supply temperature compensation heat of the hot metal by preheating gas blown into the furnace from the shaft based on the difference between the standard temperature and the measured value of the hot metal temperature during tapping. A furnace heat control method for an oxygen blast furnace characterized by the following.
出銑時の溶銑温度の測定値の差に基づく制御においてこ
の出銑時の溶銑温度を各々の出銑口からの溶銑温度とし
、吹き込む予熱ガスの熱量を出銑口毎に制御し、円周バ
ランスを図ることを特徴とする請求範囲第１項記載の酸
素高炉の炉熱制御方法。(2) A standard temperature of hot metal during tapping is set, and in control based on the difference between the standard temperature and the measured value of the hot metal temperature during tapping, this hot metal temperature during tapping is adjusted to The furnace heat control method for an oxygen blast furnace according to claim 1, characterized in that the temperature and the amount of heat of the preheated gas blown in are controlled for each tap hole to achieve circumferential balance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP186587A JPS63171809A (en) | 1987-01-09 | 1987-01-09 | Control method for furnace heat in oxygen blast furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP186587A JPS63171809A (en) | 1987-01-09 | 1987-01-09 | Control method for furnace heat in oxygen blast furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63171809A true JPS63171809A (en) | 1988-07-15 |
Family
ID=11513441
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP186587A Pending JPS63171809A (en) | 1987-01-09 | 1987-01-09 | Control method for furnace heat in oxygen blast furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63171809A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017053029A (en) * | 2015-09-11 | 2017-03-16 | Ｊｆｅスチール株式会社 | Operation method of oxygen blast furnace |
| WO2022264561A1 (en) | 2021-06-18 | 2022-12-22 | Ｊｆｅスチール株式会社 | Oxygen blast furnace and oxygen blast furnace operation method |
| TWI794865B (en) * | 2020-07-06 | 2023-03-01 | 日商Ｊｆｅ鋼鐵股份有限公司 | Method of controlling temperature of molten iron, method of operation instruction, operation method of blast furnace, method of manufacturing molten iron, device for controlling temperature of molten iron, and operation instruction device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS552723A (en) * | 1978-06-19 | 1980-01-10 | Nippon Steel Corp | Operating method for blast furnace through phenomenal control |
| JPS57131303A (en) * | 1981-02-04 | 1982-08-14 | Nippon Steel Corp | Method for operation of blast furnace |
| JPS60159104A (en) * | 1984-01-27 | 1985-08-20 | Nippon Kokan Kk <Nkk> | Method for operating blast furnace |
-
1987
- 1987-01-09 JP JP186587A patent/JPS63171809A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS552723A (en) * | 1978-06-19 | 1980-01-10 | Nippon Steel Corp | Operating method for blast furnace through phenomenal control |
| JPS57131303A (en) * | 1981-02-04 | 1982-08-14 | Nippon Steel Corp | Method for operation of blast furnace |
| JPS60159104A (en) * | 1984-01-27 | 1985-08-20 | Nippon Kokan Kk <Nkk> | Method for operating blast furnace |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017053029A (en) * | 2015-09-11 | 2017-03-16 | Ｊｆｅスチール株式会社 | Operation method of oxygen blast furnace |
| TWI794865B (en) * | 2020-07-06 | 2023-03-01 | 日商Ｊｆｅ鋼鐵股份有限公司 | Method of controlling temperature of molten iron, method of operation instruction, operation method of blast furnace, method of manufacturing molten iron, device for controlling temperature of molten iron, and operation instruction device |
| WO2022264561A1 (en) | 2021-06-18 | 2022-12-22 | Ｊｆｅスチール株式会社 | Oxygen blast furnace and oxygen blast furnace operation method |
| KR20230169328A (en) | 2021-06-18 | 2023-12-15 | 제이에프이 스틸 가부시키가이샤 | Oxygen blast furnace and oxygen blast furnace operation method |
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