JP5549056B2 - 高炉操業方法 - Google Patents
高炉操業方法 Download PDFInfo
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- JP5549056B2 JP5549056B2 JP2008067829A JP2008067829A JP5549056B2 JP 5549056 B2 JP5549056 B2 JP 5549056B2 JP 2008067829 A JP2008067829 A JP 2008067829A JP 2008067829 A JP2008067829 A JP 2008067829A JP 5549056 B2 JP5549056 B2 JP 5549056B2
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- blast furnace
- temperature
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- furnace
- gas
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- 238000000034 method Methods 0.000 title claims description 12
- 229910052739 hydrogen Inorganic materials 0.000 claims description 33
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 32
- 239000001257 hydrogen Substances 0.000 claims description 32
- 239000000463 material Substances 0.000 claims description 28
- 239000000498 cooling water Substances 0.000 claims description 10
- 238000007664 blowing Methods 0.000 claims description 7
- 239000007789 gas Substances 0.000 description 28
- 239000002826 coolant Substances 0.000 description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 14
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 14
- 238000006243 chemical reaction Methods 0.000 description 11
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 10
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- 230000007423 decrease Effects 0.000 description 8
- 238000006722 reduction reaction Methods 0.000 description 8
- 239000003245 coal Substances 0.000 description 7
- 239000003949 liquefied natural gas Substances 0.000 description 7
- 230000009467 reduction Effects 0.000 description 7
- 239000000571 coke Substances 0.000 description 6
- 238000001816 cooling Methods 0.000 description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 239000003915 liquefied petroleum gas Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000011017 operating method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 238000002407 reforming Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002801 charged material Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- -1 for example Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Images
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- Blast Furnaces (AREA)
Description
3Fe2O3+CO→2Fe3O4+CO2(反応熱:+38kcal/kgFe)・・・(a)
Fe3O4+CO→3FeO+CO2(反応熱:−38kcal/kgFe)・・・(b)
FeO+CO→Fe+CO2(反応熱:+60 kcal/kgFe)・・・(c)
3Fe2O3+H2→2Fe3O4+H2O(反応熱:+5kcal/kgFe)・・・(d)
Fe3O4+H2→3FeO+H2O(反応熱:−96kcal/kgFe)・・・(e)
FeO+H2→Fe+H2O(反応熱:−116kcal/kgFe)・・・(f)
上記の反応式は、羽口からの投入水素量が増え、酸化鉄の還元のうち、水素還元の比率が大きくなっていくとシャフト部の温度が低下し、鉄鉱石、焼結鉱等装入物の低温領域での滞留時間が拡大する可能性があることを示唆している。シャフト部の低温領域の拡大は焼結鉱の還元粉化領域の拡大を意味し、還元による鉄鉱石等の粉化により、通気性および装入物降下挙動を悪化させる。また、炉頂ガスの温度も低下させることが指摘されている。炉頂ガス温度は高炉操業上110℃以上であることが望ましく、炉頂ガスの温度が低下すると、高炉ガス中の水分が凝結し、設備腐食をきたす等の問題が発生する。
(1)羽口から、Hを10質量%以上含有する還元材を吹き込む高炉操業において、高炉の炉壁を冷却媒体を流通させるステーブを用いて冷却する際に、シャフト部に設置されたステーブに流通させる冷却媒体の流速を1.0m/s未満とすることを特徴とする高炉操業方法。
(2)前記還元材吹き込み由来の水素分として3kg/t−pig以上吹き込むことを特徴とする(1)に記載の高炉操業方法。
(3)前記ステーブ中の冷却媒体を流通させる流路の断面積を大きくすることで前記冷却媒体の流速を1.0m/s未満とすることを特徴とする(1)または(2)に記載の高炉操業方法。
2 ステーブ
2a 上部ステーブ
2b 下部ステーブ
3 羽口
4 熱交換器
5 入り側冷却媒体
6 出側冷却媒体
Claims (2)
- 羽口から、Hを10質量%以上含有する還元材を、前記還元材吹き込み由来の水素分として3kg/t−pig以上吹き込む高炉操業において、
高炉の炉壁を、冷却水を流通させるステーブを用いて冷却する際に、シャフト部に設置されたステーブに流通させる冷却水の流速を0.3m/s以上0.6m/s未満とすることを特徴とする高炉操業方法。 - 前記ステーブ中の冷却水を流通させる流路の断面積を大きくすることで前記冷却水の流速を0.3m/s以上0.6m/s未満とすることを特徴とする請求項1に記載の高炉操業方法。
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JP2008067829A JP5549056B2 (ja) | 2008-03-17 | 2008-03-17 | 高炉操業方法 |
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JP2008067829A JP5549056B2 (ja) | 2008-03-17 | 2008-03-17 | 高炉操業方法 |
Publications (3)
Publication Number | Publication Date |
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JP2009221548A JP2009221548A (ja) | 2009-10-01 |
JP2009221548A5 JP2009221548A5 (ja) | 2011-04-28 |
JP5549056B2 true JP5549056B2 (ja) | 2014-07-16 |
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JP2008067829A Active JP5549056B2 (ja) | 2008-03-17 | 2008-03-17 | 高炉操業方法 |
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Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN107841584B (zh) * | 2017-12-13 | 2023-04-11 | 中冶京诚工程技术有限公司 | 变锥度的高炉炉身结构 |
JP7440717B2 (ja) * | 2019-11-28 | 2024-02-29 | 日本製鉄株式会社 | 高炉冷却装置および高炉冷却方法 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP3702866B2 (ja) * | 2002-06-06 | 2005-10-05 | 住友金属工業株式会社 | ステーブクーラおよびこれを用いた金属精錬方法 |
JP2007186759A (ja) * | 2006-01-13 | 2007-07-26 | Jfe Steel Kk | 高炉操業方法 |
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- 2008-03-17 JP JP2008067829A patent/JP5549056B2/ja active Active
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