WO2016157794A1 - 高炉への原料装入方法 - Google Patents

高炉への原料装入方法 Download PDF

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Publication number
WO2016157794A1
WO2016157794A1 PCT/JP2016/001555 JP2016001555W WO2016157794A1 WO 2016157794 A1 WO2016157794 A1 WO 2016157794A1 JP 2016001555 W JP2016001555 W JP 2016001555W WO 2016157794 A1 WO2016157794 A1 WO 2016157794A1
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WO
WIPO (PCT)
Prior art keywords
coke
raw material
blast furnace
charging
mixed
Prior art date
Application number
PCT/JP2016/001555
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English (en)
French (fr)
Japanese (ja)
Inventor
寿幸 廣澤
和平 市川
大山　伸幸
Original Assignee
Ｊｆｅスチール株式会社
Priority date (The priority date 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 date listed.)
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Application filed by Ｊｆｅスチール株式会社 filed Critical Ｊｆｅスチール株式会社
Priority to JP2016535260A priority Critical patent/JP6041073B1/ja
Priority to CN201680017640.0A priority patent/CN107406896B/zh
Priority to KR1020177029833A priority patent/KR102058834B1/ko
Publication of WO2016157794A1 publication Critical patent/WO2016157794A1/ja

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace

Definitions

  • the present invention relates to a raw material charging method into a blast furnace, in which the raw material is charged into the blast furnace through a turning chute.
  • a blast furnace is generally charged with ore raw materials such as sintered ore, pellets, and massive ore and coke stacked in the direction of the furnace axis from the top of the blast furnace, and combustion gas is allowed to flow from the tuyere of the blast furnace. It is a facility for burning pigs and obtaining pig iron from ore.
  • Coke and ore raw materials which are blast furnace charging materials charged in the blast furnace, descend from the top of the furnace to the lower part of the furnace, and ore reduction and raw material temperature rise occur.
  • the ore raw material layer gradually deforms while filling the gaps between the ore raw materials due to the temperature rise and the load from above, and under the shaft part of the blast furnace, it has a very high ventilation resistance and a gas that hardly flows. Form a layer.
  • raw material charging into a blast furnace is performed by alternately charging ore raw materials and coke, and in the furnace, ore raw material layers and coke layers are alternately layered. Further, in the lower part of the blast furnace, there are an ore raw material layer having a high air flow resistance in which ores are softened and fused, and a coke slit derived from coke and having a relatively low air resistance.
  • the air permeability of this cohesive zone has a great influence on the air permeability of the entire blast furnace, and the productivity in the blast furnace is limited.
  • the amount of coke used is reduced, so the coke slit can be considered as thin as possible, and it is important to ensure the permeability of the cohesive zone. become.
  • Patent Document 1 in a bell-less blast furnace, coke is charged into the ore hopper on the downstream side of the ore hopper, and the coke is stacked on the ore on the conveyor, and then charged into the furnace top bunker. The ore and coke are charged into the blast furnace through the turning chute.
  • Patent Document 2 ore and coke are separately stored in a bunker at the top of the furnace, and coke and ore are mixed and charged at the same time, so that a normal charging batch for coke and a central charging batch for coke are used. And three batches for mixing and charging are performed simultaneously.
  • Patent Document 3 in order to prevent the destabilization of the cohesive zone shape in the blast furnace operation and the decrease in the gas utilization rate near the center, and to improve the safe operation and the thermal efficiency, all ore and all coke are thoroughly mixed and then charged into the furnace.
  • JP-A-3-211210 JP 2004-107794 A Japanese Patent Publication No.59-10402
  • the average particle size of the typical coke described in Patent Document 3 is about 40 mm and the average particle size of the ore is about 15 mm, and the particle sizes of both are greatly different. Ore gets in between, the porosity is greatly reduced, the air permeability is deteriorated in the furnace, and there is a possibility that troubles such as blowout of gas and poor lowering of raw materials may occur.
  • a method of forming a coke-only layer in the core part of the furnace can be considered. According to this method, the passage of gas through the coke layer is secured in the core portion of the furnace, so that air permeability can be improved.
  • an object of the present invention is to propose a raw material charging method for a blast furnace that can achieve stabilization of blast furnace operation and improvement of thermal efficiency.
  • the gist configuration of the present invention is as follows. 1.
  • the swirling chute is tilted at an average angle ⁇ 1 with respect to the axial direction of the blast furnace to supply the charging raw material O1, and then the swirling chute is tilted at an average angle ⁇ 2 larger than the average angle ⁇ 1 to inject the charging raw material.
  • a raw material charging method to a blast furnace in which a raw material charging layer is formed by supplying a charging raw material O2 mixed with coke having a particle size 1.1 to 3.0 times the particle size of coke mixed with O1.
  • the ore raw material is a general term for sintered ore, pellets, massive ore, and the like.
  • the average angle is defined by the following equation.
  • the formation of the raw material charging layer is defined, but the blast furnace operation is performed by alternately stacking the coke layer and the charging raw material layer in the entire blast furnace. Furthermore, a coke layer extending in the axial direction may be formed at the center of the blast furnace.
  • the air permeability in the blast furnace can be reliably ensured, thereby realizing a stable blast furnace operation with high thermal efficiency. Is done.
  • FIG. 1 is a blast furnace
  • 2 is a blast furnace throat
  • 3 is a blast furnace belly
  • 4a to 4c are top bunker
  • 5 is a coke layer
  • 5a is a central coke layer
  • 5b is a peripheral coke layer
  • 6 is an ore.
  • a raw material layer in which a raw material and coke are mixed 7 is a collecting hopper
  • 8 is a bell-less charging device
  • 9 is a swivel chute
  • 10 is a tuyered air duct.
  • a furnace top bunker is prepared by placing a mixture of ore raw materials and coke in advance on a conveyor that transports raw materials to the furnace top bunker. And the mixture may be supplied from one top bunker.
  • the raw material charging in the swirl chute blast furnace is performed by alternately charging the raw material and coke with the swirl chute 9, and the coke layer 5 and the charging raw material layer 6 are alternately layered in the furnace.
  • the raw material charging destination of the turning chute 9 is set as the inner peripheral portion of the furnace wall of the blast furnace 1 by a so-called forward tilting method.
  • the coke is charged from the furnace top bunker 4a or 4b charged with only coke, thereby forming the peripheral coke layer 5b on the inner peripheral portion of the furnace wall.
  • the coke is charged from the furnace top bunker 4a or 4b with the raw material charging destination of the swivel chute 9 as the axial center of the blast furnace, thereby forming the central coke layer 5a in the axial center of the blast furnace.
  • the charging raw material layer 6 is stacked and formed. Previously, as shown in FIG. 2, a single charging material layer 6 was formed.
  • O1 is supplied to the core side to form the inner charging raw material layer 6a.
  • the raw material O2 mixed from the ore raw material from the furnace top bunker 4c and the coke having a larger particle size than the coke of the raw material O1 from the furnace top bunker 4b is mixed on the furnace wall side.
  • the outer charging material layer 6b is formed by supplying.
  • the charging raw material layer 6 is constituted by the lamination of the inner charging raw material layer 6a and the outer charging raw material layer 6b.
  • the ratio DpC2 / DpC1 of the particle size DpC2 of the coke mixed with the charging raw material O2 and the particle size DpC1 of the coke mixed with the charging raw material O1 is 1.1 to 3.0. is there.
  • the charging chute 9 is inclined at an average angle ⁇ 1 and the charging material O1 is supplied to the core side to The charging raw material layer 6a is formed.
  • the turning chute 9 is tilted at an average angle ⁇ 2 larger than the average angle ⁇ 1, and the charging raw material O2 having a large mixed coke particle size is supplied to form the outer charging raw material layer 6b.
  • the average angles ⁇ 1 and ⁇ 2 of the turning chute 9 are preferably set so that ⁇ 2 / ⁇ 1 is 1.1 to 2.0 from the viewpoint of ensuring the air permeability and reactivity of the charged raw material layer.
  • the air permeability in the blast furnace can be reliably ensured. This is because the gas flow rate in the blast furnace is not uniform from the center of the furnace to the furnace wall and has a distribution, so that the permeability can be secured by charging coke with different particle sizes. That is, since the gas easily flows through the furnace wall portion in the shortest path connecting the blast furnace tuyere and the furnace mouth, coke having a large particle size with good air permeability is charged so as not to inhibit the gas flow.
  • the ratio DpC2 / DpC1 between the particle size DpC2 of the coke mixed with the charging raw material O2 and the particle size DpC1 of the coke mixed with the charging raw material O1 is 1.1 to 3.0, so that The charged raw material O1 is deposited and mixed with highly reactive small particle size coke in order to ensure the reducibility of the ore, while the charged raw material O2 is aerated to improve the air permeability. Coke having a small particle size and a small resistance is deposited and mixed, so that reducibility and air permeability can be achieved at a high level.
  • the ratio DpC2 / DpC1 when the ratio DpC2 / DpC1 is less than 1.1, coke having a small airflow resistance and a large particle size cannot be deposited and mixed, so that the effect of improving air permeability cannot be obtained.
  • it is 1.5 or more.
  • the ratio DpC2 / DpC1 exceeds 3.0, the airflow resistance is reduced, but the reactivity is further reduced, and thus the effect of improving the reduction cannot be obtained.
  • it is 2.0 or less.
  • the ratio DpC1 / DpO1 of the particle diameter DpC1 of the coke mixed with the charging raw material O1 to the particle diameter DpO1 of the ore raw material mixed with the charging raw material O1 is preferably 0.5 to 1.5. That is, if the ratio DpC1 / DpO1 is less than 0.5, coke with a small particle size is mixed in the vicinity of the furnace center, and the ventilation resistance becomes high, which may hinder the gas flow flowing in the vicinity of the center of the blast furnace. is there. On the other hand, when the ratio DpC1 / DpO1 exceeds 1.5, the reactivity of the charged raw material O1 disposed on the core side becomes small, and it becomes difficult to obtain the effect of improving the reducing property. More preferably, it is 1.0 to 1.2.
  • the same mixing ratio of coke mixed with the ore raw material is made the same, and then DpC2 / DpC1 in the charging raw materials O1 and O2, and the charging raw material O1.
  • charging raw materials O1 and O2 having various changes in DpC1 / DpO1 are prepared, and they are set to the average angles ⁇ 1 and ⁇ 2 of the swiveling chute shown in Table 1 and charged into the blast furnace. , Performed each operation. The operational results in each case were investigated. The survey results are also shown in Table 1.
  • the output ratio is a value obtained by dividing the daily output (t / d) of the blast furnace by the furnace volume (m 3 ).
  • the reducing material ratio, the coke ratio, and the pulverized coal ratio are the amount of reducing material, the amount of coke, and the amount of pulverized coal (kg / t) used when producing hot metal 1t.
  • the inventive examples 1 to 9 have a coke ratio in the range of 339 to 353 kg / t, which is a low coke ratio as compared with the coke ratio of the comparative examples 1 to 3 of 356 to 360 kg / t. Yes.
  • ⁇ P / V which is an index of ventilation resistance, is 18.3 to 20 lower than the range of 20.9 to 23.1 in Comparative Examples 1 to 3. .8 range.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Iron (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
PCT/JP2016/001555 2015-03-30 2016-03-17 高炉への原料装入方法 WO2016157794A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2016535260A JP6041073B1 (ja) 2015-03-30 2016-03-17 高炉への原料装入方法
CN201680017640.0A CN107406896B (zh) 2015-03-30 2016-03-17 向高炉中装入原料的方法
KR1020177029833A KR102058834B1 (ko) 2015-03-30 2016-03-17 고로에 대한 원료 장입 방법

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015-069893 2015-03-30
JP2015069893 2015-03-30

Publications (1)

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WO2016157794A1 true WO2016157794A1 (ja) 2016-10-06

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JP (1) JP6041073B1 (ko)
KR (1) KR102058834B1 (ko)
CN (1) CN107406896B (ko)
WO (1) WO2016157794A1 (ko)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020015933A (ja) * 2018-07-24 2020-01-30 日本製鉄株式会社 ベルレス高炉の装入方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5562106A (en) * 1978-10-30 1980-05-10 Nippon Steel Corp Raw material charging method for blast furnace
JPH02213405A (ja) * 1989-02-15 1990-08-24 Kawasaki Steel Corp 高炉の原料分級装入方法およびその装置
JPH05239513A (ja) * 1991-02-28 1993-09-17 Nippon Steel Corp 高炉の原料装入方法
JP2015074801A (ja) * 2013-10-08 2015-04-20 新日鐵住金株式会社 高炉操業方法

Family Cites Families (8)

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Publication number Priority date Publication date Assignee Title
JPS5910402A (ja) 1982-07-10 1984-01-19 Toshiba Corp 圧延機及び圧延方法
JP2820478B2 (ja) 1990-01-16 1998-11-05 川崎製鉄株式会社 ベルレス高炉における原料装入方法
JP4269847B2 (ja) 2002-08-30 2009-05-27 Ｊｆｅスチール株式会社 ベルレス高炉の原料装入方法
JP2010100915A (ja) * 2008-10-27 2010-05-06 Jfe Steel Corp 竪型炉の操業方法
CN102010920A (zh) * 2010-12-24 2011-04-13 宝钢集团新疆八一钢铁有限公司 一种无钟炉顶高炉高比例球团矿炉料结构冶炼方法
WO2013172035A1 (ja) * 2012-05-17 2013-11-21 Ｊｆｅスチール株式会社 高炉への原料装入方法
WO2013172036A1 (ja) * 2012-05-18 2013-11-21 Ｊｆｅスチール株式会社 高炉への原料装入方法
CN104313215A (zh) * 2014-11-19 2015-01-28 中冶南方工程技术有限公司 一种高炉烧结矿分级装料工艺

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5562106A (en) * 1978-10-30 1980-05-10 Nippon Steel Corp Raw material charging method for blast furnace
JPH02213405A (ja) * 1989-02-15 1990-08-24 Kawasaki Steel Corp 高炉の原料分級装入方法およびその装置
JPH05239513A (ja) * 1991-02-28 1993-09-17 Nippon Steel Corp 高炉の原料装入方法
JP2015074801A (ja) * 2013-10-08 2015-04-20 新日鐵住金株式会社 高炉操業方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020015933A (ja) * 2018-07-24 2020-01-30 日本製鉄株式会社 ベルレス高炉の装入方法
JP7073962B2 (ja) 2018-07-24 2022-05-24 日本製鉄株式会社 ベルレス高炉の装入方法

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Publication number Publication date
JPWO2016157794A1 (ja) 2017-04-27
CN107406896B (zh) 2019-06-28
JP6041073B1 (ja) 2016-12-07
CN107406896A (zh) 2017-11-28
KR102058834B1 (ko) 2019-12-24
KR20170128554A (ko) 2017-11-22

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