JP2020132928A - 還元ガスの吹込み量決定方法及び高炉の操業方法 - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000007664 blowing Methods 0.000 title claims abstract description 20
- 239000007789 gas Substances 0.000 claims abstract description 241
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 106
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 105
- 230000009467 reduction Effects 0.000 claims abstract description 44
- 125000004432 carbon atom Chemical group C* 0.000 claims abstract description 5
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims abstract description 5
- 239000000571 coke Substances 0.000 claims description 28
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 24
- 239000003345 natural gas Substances 0.000 claims description 11
- 230000007423 decrease Effects 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 3
- 230000003247 decreasing effect Effects 0.000 abstract description 2
- 238000006722 reduction reaction Methods 0.000 description 51
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 42
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 29
- 239000003638 chemical reducing agent Substances 0.000 description 28
- 229910052739 hydrogen Inorganic materials 0.000 description 27
- 239000001257 hydrogen Substances 0.000 description 26
- 239000002184 metal Substances 0.000 description 24
- 229910052751 metal Inorganic materials 0.000 description 24
- 239000002994 raw material Substances 0.000 description 21
- 229910052742 iron Inorganic materials 0.000 description 20
- 239000003245 coal Substances 0.000 description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 14
- 239000001301 oxygen Substances 0.000 description 14
- 229910052760 oxygen Inorganic materials 0.000 description 14
- 238000004088 simulation Methods 0.000 description 11
- 239000000203 mixture Substances 0.000 description 9
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 4
- 229910000805 Pig iron Inorganic materials 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 235000013980 iron oxide Nutrition 0.000 description 2
- 238000013178 mathematical model Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000002801 charged material Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 210000003746 feather Anatomy 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- -1 sintered ore Chemical compound 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/006—Automatically controlling the process
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/06—Making pig-iron in the blast furnace using top gas in the blast furnace process
-
- 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
- F27B14/00—Crucible or pot furnaces
- F27B14/08—Details peculiar to crucible or pot furnaces
- F27B14/14—Arrangements of heating devices
- F27B14/143—Heating of the crucible by convection of combustion gases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B2005/005—Selection or treatment of the reducing gases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2300/00—Process aspects
- C21B2300/04—Modeling of the process, e.g. for control purposes; CII
-
- 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
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacture Of Iron (AREA)
- Blast Furnaces (AREA)
Abstract
Description
Input △C=(A−B)/A×100(%) (2)
まず、図1に基づいて、Input △Cと羽口から吹き込む還元ガス中の炭素原単位との相関(以下、当該相関を「△C−還元ガス相関」とも称する)について説明する。図1の縦軸(y軸)はInput △C(%)を示し、横軸(x軸)は還元ガス中の炭素原単位(kg/t−pig)を示す。点P1はベース操業(還元ガスを吹き込まない操業)におけるInput △C及び還元ガス中の炭素原単位を示し、点P2は還元ガスとしてコークス炉ガス(COG)を吹き込んだ操業におけるInput △C及び還元ガス中の炭素原単位を示し、点P3は還元ガスとして天然ガスを吹き込んだ操業におけるInput △C及び還元ガス中の炭素原単位を示す。グラフL1は△C−還元ガス相関を示すグラフである。
Input △C=(A−B)/A×100(%) (2)
(0.065+0.025+0.292+0.02×2+0.008×2)/(0.535×2+0.292×4+0.02×4+0.008×6)=0.185
(0.85+0.03×2+0.12×2)/(0.85×4+0.03×4+0.12×6)=0.271
つぎに、上述した△C−還元ガス相関を用いた還元ガスの吹込み量決定方法について説明する。まず、上述した△C−還元ガス相関に基づいて還元ガス中の炭素原単位の設定値を規定する。ここで、設定値は21〜107kg/t−pigの範囲内の値であることが好ましく、21〜65kg/t−pigの範囲内の値であることがより好ましい。その理由は上述した通りである。すなわち、設定値を21〜107kg/t−pigの範囲内の値とすることで、Input △Cを4.0%以上の値とすることができる。さらに、設定値を21〜65kg/t−pigの範囲内の値とすることで、より少ない還元ガスの吹込み量でInput △Cを大きく(具体的には4.0%以上と)することができる。さらに、還元ガス中の炭素割合が少ない(特に炭素割合が0.6kg/Nm3未満となる)場合であっても、Input △Cを大きくしつつ、羽口前温度を所定値以上に安定して維持することができる。
つぎに、本実施形態における高炉の操業方法について説明する。本実施形態における高炉の操業方法では、上述した方法により決定された吹込み量の還元ガスを高炉に吹き込む。それ以外の操業条件は従来の操業条件と同様であってもよく、高炉操業シミュレーション等により算出された操業条件であってもよい。
Claims (5)
- 炭素原子と水素原子とのモル比C/Hが0.15以上である還元ガスの高炉への吹込み量を決定する還元ガスの吹込み量決定方法であって、
前記還元ガスの前記高炉への吹き込みによる炭素消費原単位の削減量Input △Cと前記還元ガスにより前記高炉に持ち込まれる炭素の原単位との相関に基づいて、前記炭素の原単位の設定値を規定し、
前記設定値と前記還元ガス中の炭素割合とに基づいて、前記還元ガスの前記高炉への吹込み量を決定することを特徴とする、還元ガスの吹込み量決定方法。 - 前記設定値を21〜107kg/t−pigの範囲内の値とすることを特徴とする、請求項1記載の還元ガスの吹込み量決定方法。
- 前記設定値を21〜65kg/t−pigの範囲内の値とすることを特徴とする、請求項1または2に記載の還元ガスの吹込み量決定方法。
- 前記還元ガスは、コークス炉ガス、天然ガス、及び都市ガス、並びにこれらの混合ガスからなる群から選択されることを特徴とする、請求項1〜3の何れか1項に記載の還元ガスの吹込み量決定方法。
- 請求項1〜4のいずれか1項に規定された還元ガスの吹込み量決定方法により決定された吹込み量の還元ガスを前記高炉に吹き込むことを特徴とする、高炉の操業方法。
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JP2019026220A JP7105708B2 (ja) | 2019-02-18 | 2019-02-18 | 還元ガスの吹込み量決定方法及び高炉の操業方法 |
TW109104884A TWI730628B (zh) | 2019-02-18 | 2020-02-15 | 高爐操作方法 |
US17/430,657 US20220119899A1 (en) | 2019-02-18 | 2020-02-17 | Blast furnace operation method |
CN202080014651.XA CN113423845B (zh) | 2019-02-18 | 2020-02-17 | 高炉操作方法 |
AU2020226229A AU2020226229B2 (en) | 2019-02-18 | 2020-02-17 | Blast furnace operation method |
KR1020217027226A KR102585689B1 (ko) | 2019-02-18 | 2020-02-17 | 고로 조업 방법 |
PCT/JP2020/006011 WO2020171008A1 (ja) | 2019-02-18 | 2020-02-17 | 高炉操業方法 |
UAA202104860A UA127367C2 (uk) | 2019-02-18 | 2020-02-17 | Спосіб експлуатації доменної печі |
CA3128163A CA3128163C (en) | 2019-02-18 | 2020-02-17 | Blast furnace operation method |
EP20759676.8A EP3907303B1 (en) | 2019-02-18 | 2020-02-17 | Blast furnace operation method |
BR112021014817-5A BR112021014817A2 (pt) | 2019-02-18 | 2020-02-17 | Método de operação de alto forno |
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US4198228A (en) * | 1975-10-24 | 1980-04-15 | Jordan Robert K | Carbonaceous fines in an oxygen-blown blast furnace |
JP2012520939A (ja) * | 2009-03-17 | 2012-09-10 | アルセロルミタル・インベステイガシオン・イ・デサロジヨ・エセ・エレ | 高炉ガスを再循環させる方法、および関連装置 |
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CA3128163A1 (en) | 2020-08-27 |
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US20220119899A1 (en) | 2022-04-21 |
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