WO2014045945A1 - ブローパイプ構造 - Google Patents

ブローパイプ構造 Download PDF

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Publication number
WO2014045945A1
WO2014045945A1 PCT/JP2013/074402 JP2013074402W WO2014045945A1 WO 2014045945 A1 WO2014045945 A1 WO 2014045945A1 JP 2013074402 W JP2013074402 W JP 2013074402W WO 2014045945 A1 WO2014045945 A1 WO 2014045945A1
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WO
WIPO (PCT)
Prior art keywords
pipe
pulverized coal
tuyere
hot air
blow
Prior art date
Application number
PCT/JP2013/074402
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
雅一 坂口
務 濱田
剛嗣 岡田
大本　節男
慶一 中川
Original Assignee
三菱重工業株式会社
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.)
Filing date
Publication date
Application filed by 三菱重工業株式会社 filed Critical 三菱重工業株式会社
Priority to KR20157006492A priority Critical patent/KR20150040363A/ko
Priority to US14/428,553 priority patent/US20150275322A1/en
Priority to DE112013004592.3T priority patent/DE112013004592T5/de
Priority to CN201380045513.8A priority patent/CN104603296A/zh
Priority to IN2018DEN2015 priority patent/IN2015DN02018A/en
Publication of WO2014045945A1 publication Critical patent/WO2014045945A1/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
    • 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
    • C21B5/003—Injection of pulverulent coal
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/16—Tuyéres
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/16—Tuyéres
    • C21B7/163—Blowpipe assembly

Definitions

  • the present invention relates to a blow pipe structure that is applied to blast furnace equipment, and more particularly to a blow pipe structure that is suitable when pulverized coal obtained by pulverizing low-grade coal as auxiliary fuel is blown into a furnace together with hot air.
  • Patent Document 2 discloses a configuration in which a partition ring is provided in a hollow portion of a tuyere. With such a partition ring, the tip side of the tuyere has a double-pipe structure that partitions the main passage in the central region and the sub-passage in the peripheral region. It is allowed to pass separately from the passage to form a jet in the furnace.
  • Patent Document 1 points out the following two problems.
  • the first problem is that it is difficult to completely (uniformly) mix the pulverized coal and the additive, and as a result, it is impossible to prevent slag formation in a portion where the mixing ratio of the additive is lower than a predetermined value.
  • the second problem is that a new source of calcium oxide (CaO) such as limestone or serpentinite is required, which causes extra costs.
  • the blow pipe structure according to one aspect of the present invention is attached to a tuyere of a blast furnace body that manufactures pig iron from iron ore, and blows pulverized coal of auxiliary fuel together with hot air, and the hot air and / or the slag of the pulverized coal
  • the inner and outer double-pipe structure is provided with an inner pipe that opens, and the pulverized coal outlet of the injection lance into which the pulverized coal is charged is opened inside the inner pipe.
  • an inner / outer double pipe structure in which an inner pipe that continuously opens from the mother pipe to the vicinity of the tuyere is provided inside the outer pipe that continues from the mother pipe supplying hot air to the tuyere. Since the pulverized coal outlet of the injection lance into which the pulverized coal is charged is open inside the inner pipe, the flow of the pulverized coal charged from the injection lance is flowed from the outer pipe wall on the upstream side of the tuyere. That is, it can be completely separated from the inner wall surface of the blow pipe. Furthermore, in the tuyere, pulverized coal can be passed away from the tuyere surface. As a result, pulverized coal slag is less likely to adhere to the tuyere surface and the inner wall surface of the blow pipe.
  • a flow path resistance at a position that is a flow path formed between the outer pipe and the inner pipe and that is near the outlet of the inner pipe.
  • the hot air temperature in the inner pipe can be adjusted to create an environment in which pulverized coal is difficult to burn.
  • an oxygen input pipe for supplying oxygen to the outer pipe.
  • the operating conditions of the inner pipe and the outer pipe can be changed.
  • the pulverized coal in the inner tube is difficult to burn as described above.
  • the inner and outer double pipe structure is provided with an inner pipe inside the outer pipe continuous from the main pipe supplying hot air to the tuyere, and the injection lance for injecting pulverized coal is used. Since the pulverized coal outlet is open to the inside of the inner pipe, the pulverized coal slag is less likely to adhere to the tuyere surface and the blow pipe inner wall surface. Therefore, it is possible to suppress the adhesion of slag with a simple blow pipe structure of a double pipe structure without adjusting the softening point. As a result, low grade coal having an ash melting point as low as about 1100 to 1300 ° C., such as subbituminous coal and lignite, can be used as pulverized coal as auxiliary fuel by reforming it as raw coal.
  • FIG. 1 It is a longitudinal section showing an axial section as one embodiment of a blowpipe structure concerning the present invention. It is a figure which shows the structural example of the blast furnace equipment to which the blowpipe structure shown in FIG. 1 is applied.
  • the blow pipe structure of the present embodiment is used for blast furnace equipment in which pulverized coal whose raw coal is low-grade coal is blown into the blast furnace together with hot air from the tuyere.
  • a raw material 1 such as iron ore, limestone, and coal is supplied from a raw material fixed supply device 10 to a furnace top hopper 21 provided at the top of a blast furnace body 20 via a carry-in conveyor 11.
  • the lower side wall of the blast furnace main body 20 is provided with a plurality of tuyere 22 arranged at substantially equal pitches in the circumferential direction.
  • Each tuyere 22 is connected to a downstream end of a blow pipe 30 that supplies hot air 2 into the blast furnace body 20.
  • the upstream end of each blow pipe 30 is connected to a hot air supply device 40 that is a supply source of the hot air 2 supplied to the inside of the blast furnace body 20.
  • pretreatment such as evaporation of moisture in the coal from raw coal (low-grade coal such as subbituminous coal and lignite) is performed, and after this pretreatment, low-grade coal is A pulverized coal production apparatus 50 that is pulverized into pulverized coal is installed.
  • the reformed pulverized coal (modified coal) 3 produced by the pulverized coal production apparatus 50 is gas-transported to the cyclone separator 60 by a carrier gas 4 such as nitrogen gas. After the gas transported pulverized coal 3 is separated from the transported gas 4 by the cyclone separator 60, it is dropped into the storage tank 70 and stored.
  • the pulverized coal 3 after such reforming is used as blast furnace blown coal (PCI charcoal) of the blast furnace body 20.
  • the pulverized coal 3 in the storage tank 70 is supplied into the injection lance (hereinafter referred to as “lance”) 31 of the blow pipe 30 described above.
  • the pulverized coal 3 is combusted by being supplied into the hot air flowing through the blow pipe 30 and forms a flame at the tip of the blow pipe 30 to form a raceway.
  • the coal etc. which are contained in the raw material 1 thrown in in the blast furnace main body 20 are burned.
  • the iron ore contained in the raw material 1 is reduced to become pig iron (molten metal) 5 and taken out from the tap outlet 23.
  • a suitable property of the pulverized coal 3 that is supplied from the lance 31 to the inside of the blow pipe 30 and becomes the blast furnace blowing coal that is, a modified pulverized coal (auxiliary fuel) obtained by reforming and pulverizing low-grade coal.
  • the oxygen atom content (dry base) is 10 to 18% by weight
  • the average pore diameter is 10 to 50 nm (nanometers).
  • the more preferable average pore diameter of the modified pulverized coal is 20 to 50 nm (nanometers).
  • Such pulverized coal 3 is largely reduced in the main skeleton (C, H, O) although the tar-generating groups of the oxygen-containing functional groups (carboxyl group, aldehyde group, ester group, hydroxyl group, etc.) are greatly reduced.
  • the decomposition (decrease) of the combustion component is greatly suppressed. For this reason, when the hot air 2 is blown into the blast furnace body 20 from the tuyere 22, the main skeleton contains a large amount of oxygen atoms, and the oxygen in the hot air 2 easily diffuses into the charcoal due to the large-diameter pores.
  • tar content is very difficult to generate, complete combustion can be achieved with almost no unburned carbon (soot).
  • low-grade coal such as sub-bituminous coal or lignite as raw coal (dry base oxygen atom content ratio: 18% by weight)
  • a drying step is carried out by heating (110 to 200 ° C. ⁇ 0.5 to 1 hour) in a low oxygen atmosphere having an oxygen concentration of 5% by volume or less.
  • the raw coal After removing moisture in the above-described drying step, the raw coal is heated again in a low oxygen atmosphere (oxygen concentration: 2% by volume or less) (460 to 590 ° C. (preferably 500 to 550 ° C.)) ⁇ 0.5 to 1
  • a dry distillation step is carried out.
  • the raw coal is carbonized by this carbonization process, so that generated water, carbon dioxide and tar are removed as carbonized gas or carbonized oil.
  • the raw coal that has advanced to the cooling step is cooled (50 ° C. or lower) in a low oxygen atmosphere having an oxygen concentration of 2% by volume or less, and then finely pulverized (particle size: 77 ⁇ m or less (80%) Pass)) and is easily manufactured.
  • the auxiliary fuel pulverized coal 3 is blown together with the hot air 2 and attached to the tuyere 22 of the blast furnace main body 20 that produces pig iron from iron ore, and hot air is blown into the slag of the pulverized coal 3.
  • the structure described below is adopted as the blow pipe 30 containing a component that is melted by the combustion heat of 2 and / or pulverized coal 3. That is, the illustrated blow pipe 30 employs an inner / outer double pipe structure.
  • This inner / outer double pipe structure is connected to the hot air feeding device 40 and continues from the main pipe 41 for supplying hot air 2 to the tuyere 22, and has a structure in which an inner pipe 30b is provided inside the outer pipe 30a. It has become.
  • the outer pipe 30 a of the blow pipe 30 is branched from the mother pipe 41 and connected to the tuyere 22.
  • the inner pipe 30b of the blow pipe 30 branches off from the mother pipe 41 like the outer pipe 30a, and the inner pipe outlet 30c on the downstream side opens near the inlet of the tuyere 22.
  • the blow pipe 30 has an inner pipe outlet 30c that continuously opens from the mother pipe 41 to the vicinity of the tuyere 22 inside the outer pipe 30a that continues from the mother pipe 41 that supplies the hot air 2 to the tuyere 22.
  • the inner / outer double tube structure is provided with the tube 30b.
  • the blow pipe 30 has an inner / outer double pipe structure in which the inner pipe 30b into which the pulverized coal 3 is charged is provided concentrically inside the outer pipe 30a serving as the blow pipe main body and the flow path is separated. Further, it is desirable that the outer tube 30a and the inner tube 30b of the blow pipe 30 are set so that the cross-sectional area ratio is approximately 1: 1. For example, when the inner diameter of the tuyere 22 is 160 mm, the inner diameter of the outer tube 30a is 210 mm, and the inner diameter of the inner tube 30b is 140 mm. And the lance 31 which throws the pulverized coal 3 into the blow pipe 30 penetrates the outer tube 30a and the inner tube 30b, and the pulverized coal outlet 31a is opened inside the inner tube 30b.
  • the pulverized coal 3 is introduced into the inner pipe 30b from the lance 31. Therefore, on the upstream side of the tuyere 22, the flow of the pulverized coal 3 is changed to the outer pipe 30a. Can be completely separated from the wall surface of the outer tube. That is, the flow of the pulverized coal 3 is completely separated from the inner wall surface of the blow pipe 30, and further, in the tuyere 22, the flow of the pulverized coal 3 can be passed away from the surface of the tuyere 22.
  • the flow path cross-sectional area is set at a position that is the outer peripheral flow path 30d formed between the outer pipe 30a and the inner pipe 30b and near the outlet of the inner pipe 30b. It is desirable to provide a flow path resistance 80 that decreases. Such a channel resistance 80 can make the flow velocity in the inner tube 30b having a small channel resistance faster than in the outer tube. As a result, since the hot air 2 flowing out from the outer pipe 30a flows so as to be guided toward the axial center of the inner pipe 30b, that is, toward the flow path center of the blow pipe 30, the pulverized coal 3 introduced into the inner pipe 30b is slag. It becomes difficult to flow in the direction of the outer tube 30a where it is desired to prevent adhesion.
  • the channel resistance 80 described above is a member that narrows the channel cross-sectional area by projecting from the inner wall surface of the outer tube 30a or the outer wall surface of the inner tube 30b, or from the inner wall surface of the outer tube 30a and the outer wall surface of the inner tube 30b.
  • the cross-sectional shape is not particularly limited.
  • a wedge-shaped projecting member is provided on the inner wall surface of the outer tube 30a, such as a channel resistance 80 having an inclined surface 81 that reduces the channel cross-sectional area from the upstream side to the downstream side in the flow direction, Since the inclined surface 81 guides the hot air 2 flowing through the outer peripheral flow path 30d toward the center of the tuyere 22, the flow of the pulverized coal 3 is guided toward the center of the tuyere 22, so that slag adhesion of the pulverized coal 3 can be further suppressed. .
  • the blow pipe structure described above preferably includes a nitrogen input pipe 90 that supplies nitrogen into the inner pipe 30b.
  • the nitrogen input pipe 90 is for supplying nitrogen gas to the hot air 2 flowing in the inner pipe 30b as necessary, for example, when it is desired to change the operating conditions of the inner pipe 30b and the outer pipe 30a. Accordingly, when nitrogen is blown into the inner pipe 30b, the hot air temperature is lowered, so that the temperature of the hot air 2 can be lowered to the slag melting point or lower. That is, the nitrogen input pipe 90 adjusts the hot air temperature in the inner pipe 30b and reduces the oxygen concentration by introducing nitrogen, so that it can be adjusted to an environment in which the pulverized coal 3 is difficult to burn.
  • the blow pipe structure described above preferably includes an oxygen input pipe 91 that supplies oxygen to the inside of the outer pipe 30a, that is, to the inside of the outer peripheral flow path 30d.
  • the oxygen input pipe 91 is for supplying oxygen to the hot air 2 flowing in the outer pipe 30a as necessary, for example, when it is desired to change the operating conditions of the inner pipe 30b and the outer pipe 30a. Accordingly, the hot air 2 in which oxygen concentration is increased by blowing oxygen into the outer pipe 30a is mixed with the pulverized coal 3 introduced into the inner pipe 30b in the vicinity of the entrance of the tuyere 22, thereby quickly burning the pulverized coal 3. Can be made. Such promotion of combustion increases the temperature of the hot air 2, so that the combustion of the pulverized coal 3 is further promoted.
  • the oxygen concentration adjustment of the hot air 2 will be specifically described with an example.
  • the oxygen concentration is set to 21% by volume.
  • oxygen is blown into the outer pipe 30a from the oxygen input pipe 91, and the oxygen concentration is enriched to 25 to 50% by volume, preferably 30 to 35% by volume. To do.
  • the combustion speed of the pulverized coal 3 can be suppressed, and the slag can be prevented from adhering in the inner pipe 30b.
  • the hot air 2 and the pulverized coal 3 flowing in the inner pipe 30b are combined with the hot air 2 after oxygen enrichment flowing in from the outer pipe 30a, so that the combustion speed of the pulverized coal 3 is improved due to the increase in oxygen concentration,
  • the pulverized coal 3 to be blown coal into the blast furnace body 20 can be completely burned in the raceway.
  • nitrogen is also introduced into the inner pipe 30b, and the hot air temperature in the inner pipe 30b is adjusted to be equal to or lower than the ash melting point according to the properties of the pulverized coal 3. Also good.
  • an inner / outer double pipe structure in which the inner pipe 30b is provided inside the outer pipe 30a continuous from the mother pipe 41 to the tuyere 22 is used. Since the pulverized coal outlet 31a of the lance 31 to be introduced is opened inside the inner pipe 30b, the flow of the pulverized coal 3 is separated from the surface of the tuyere 22 and the inner wall surface of the blow pipe 30. As a result, the pulverized coal 3 Slag becomes difficult to adhere. Therefore, even if the softening point of the pulverized coal 3 is not adjusted, it is possible to suppress the adhesion of slag with a simple blow pipe structure called an inner / outer double pipe structure. For this reason, for the blow pipe 30, for example, the maintenance period can be extended to the wear life of the tuyere 22.
  • the component contained in the slag of the pulverized coal 3 and melted by the hot air 2 or the combustion heat of the pulverized coal 3, that is, the low melting point slag component has an ash melting point of about 1100 when the hot air 2 of about 1200 ° C. is used. About 1300 ° C.
  • Such low-melting-point slag components are also included in reformed coal using low-grade coal such as subbituminous coal and lignite as the raw coal of pulverized coal 3 and subjected to reforming treatment such as drying and dry distillation. If the blow pipe structure of this embodiment is adopted, pulverized coal 3 obtained by modifying low-grade coal as raw coal can be used as auxiliary fuel.
  • this invention is not limited to embodiment mentioned above, In the range which does not deviate from the summary, it can change suitably.

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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)
  • Blast Furnaces (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
PCT/JP2013/074402 2012-09-20 2013-09-10 ブローパイプ構造 WO2014045945A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
KR20157006492A KR20150040363A (ko) 2012-09-20 2013-09-10 블로우 파이프 구조
US14/428,553 US20150275322A1 (en) 2012-09-20 2013-09-10 Blow-pipe structure
DE112013004592.3T DE112013004592T5 (de) 2012-09-20 2013-09-10 Blasrohrstruktur
CN201380045513.8A CN104603296A (zh) 2012-09-20 2013-09-10 吹风管结构
IN2018DEN2015 IN2015DN02018A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 2012-09-20 2013-09-10

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012207273A JP6012359B2 (ja) 2012-09-20 2012-09-20 ブローパイプ構造
JP2012-207273 2012-09-20

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WO2014045945A1 true WO2014045945A1 (ja) 2014-03-27

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US (1) US20150275322A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JP6012359B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
KR (1) KR20150040363A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CN (1) CN104603296A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE112013004592T5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
IN (1) IN2015DN02018A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
WO (1) WO2014045945A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6057642B2 (ja) * 2012-09-20 2017-01-11 三菱重工業株式会社 スラグ除去装置及びスラグ除去方法
KR102348088B1 (ko) * 2017-01-02 2022-01-10 삼성전자주식회사 의류건조장치

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01268809A (ja) * 1988-04-21 1989-10-26 Nkk Corp 微粉炭バーナ
JP2000265205A (ja) * 1999-03-15 2000-09-26 Nippon Steel Corp 送風羽口
JP2013185180A (ja) * 2012-03-06 2013-09-19 Nippon Steel & Sumitomo Metal Corp 高炉羽口からの還元性ガス吹き込み方法及び吹き込みランス

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR970009084B1 (ko) * 1994-12-29 1997-06-05 김만제 탄소성분을 포함한 미분체 용융장치 및 이를 이용한 미분체 용융방법
WO2007130362A2 (en) * 2006-05-01 2007-11-15 Sierra Energy Tuyere for oxygen blast furnance/converter system
CN102312029A (zh) * 2011-01-24 2012-01-11 张昭贵 一种高炉送风装置及其喷吹煤粉的燃烧方法和富氧方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01268809A (ja) * 1988-04-21 1989-10-26 Nkk Corp 微粉炭バーナ
JP2000265205A (ja) * 1999-03-15 2000-09-26 Nippon Steel Corp 送風羽口
JP2013185180A (ja) * 2012-03-06 2013-09-19 Nippon Steel & Sumitomo Metal Corp 高炉羽口からの還元性ガス吹き込み方法及び吹き込みランス

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Publication number Publication date
JP2014062291A (ja) 2014-04-10
US20150275322A1 (en) 2015-10-01
KR20150040363A (ko) 2015-04-14
CN104603296A (zh) 2015-05-06
DE112013004592T5 (de) 2015-06-11
IN2015DN02018A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 2015-08-14
JP6012359B2 (ja) 2016-10-25

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