WO2014045948A1 - Blow-pipe structure - Google Patents
Blow-pipe structure Download PDFInfo
- Publication number
- WO2014045948A1 WO2014045948A1 PCT/JP2013/074412 JP2013074412W WO2014045948A1 WO 2014045948 A1 WO2014045948 A1 WO 2014045948A1 JP 2013074412 W JP2013074412 W JP 2013074412W WO 2014045948 A1 WO2014045948 A1 WO 2014045948A1
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- WIPO (PCT)
- Prior art keywords
- pulverized coal
- blow pipe
- flow path
- hot air
- block body
- Prior art date
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/16—Tuyéres
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/16—Tuyéres
- C21B7/163—Blowpipe assembly
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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
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.
- the flow resistance on the inner wall surface side of the pipe is increased on the downstream side of the injection lance for introducing pulverized coal into the blow pipe, and the flow of hot air and pulverized coal is concentrated at the center of the flow channel axis. Since the resistor to be provided is provided, the flow of the pulverized coal blown into the blast furnace main body is concentrated on the center of the flow path, so that the slag does not easily adhere to the tuyere surface or the inner wall surface of the blow pipe.
- a distribution of pulverized coal concentration is formed on the downstream side of the resistor, and a hot air flow with a high pulverized coal concentration is formed on the center side of the flow path, and the pulverized coal concentration on the tuyere surface and the inner wall surface side of the blow pipe is reduced. , Slag adhesion is suppressed.
- the block body and the ring-shaped block body have an inclined surface that gradually reduces the cross-sectional area of the flow path on the upstream side in the flow direction.
- the cross-sectional shape that can form an inclined surface that gradually reduces the cross-sectional area of the flow channel on the upstream side in the flow direction include a triangle and a wedge shape.
- the block body and the ring-shaped block body are provided with a protruding amount variable mechanism in the center direction of the flow path axis.
- the amount of protrusion can be easily adjusted and optimized according to the adhesion state of slag.
- FIG. 1 It is a schematic block diagram as one Embodiment of the blowpipe structure which concerns on this invention, (a) is a longitudinal cross-sectional view which shows an axial direction cross section, (b) is the front view seen from the inside of a blast furnace main body. . It is sectional drawing which shows the 1st modification which concerns on the cross-sectional shape of a block body. It is sectional drawing which shows the 2nd modification which concerns on the cross-sectional shape of a block body. 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.
- 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).
- a more preferable average pore diameter of the modified pulverized coal is 20 to 50 nm (nanometers).
- 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. 2 and / or a blow pipe structure containing a component that is melted by the combustion heat of the pulverized coal 3, on the downstream side of the lance 31 where the pulverized coal 3 is introduced into the blow pipe 30,
- a resistor 80 is provided to increase the flow path resistance and concentrate the flow of hot air 2 and pulverized coal 3 at the center of the flow path axis.
- the flow of the hot air 2 and the pulverized coal 3 flowing through the blow pipe 30 causes the flow channel axis center to have a smaller flow resistance compared to the pipe inner wall surface side. Concentrate on.
- Each block body 81 has a circumferential width so as to cover approximately 1/4 to 1/8 of the inner circumference of the blow pipe 30, for example, and has a protruding height h from the pipe inner wall surface in the flow path axial direction. It is a member having a substantially rectangular cross section.
- the protrusion height h is a value that protrudes toward the center of the flow path axis from the restriction height H at the outlet tip of the tuyere 22, that is, the protrusion height h is larger than the restriction height H (h> H).
- the block body 81 for example, a member obtained by dividing the circumferential direction of a ring-shaped member having a rectangular cross section into a plurality of parts (eight parts in the illustrated configuration example) is used.
- a plurality of the block bodies 81 arranged at intervals in the same circumferential direction (for example, 4 pieces at a pitch of 90 degrees) constitute one unit of resistance element.
- one or a plurality of resistance elements whose positions in the circumferential direction are shifted by 45 degrees are arranged at intervals in the flow path axis direction.
- the block body 81 of the resistor 80 described above has a plurality of units arranged at intervals in the circumferential direction as one unit, and the units in the circumferential direction are shifted so as to cover the entire circumference in the flow path axis direction.
- a plurality of block bodies 81 are arranged so as to cover the entire circumference on the same circumference, and one or a plurality of rows are arranged in the direction of the flow path axis as a unit. You may arrange. That is, it is possible to make a unit in which a plurality of block bodies 81 are arranged so as to contact the adjacent block bodies 81 on the same circumference and cover the entire circumference without providing a gap.
- the resistor 80 described above may be one or a plurality of ring-shaped block bodies projecting over the entire inner wall surface of the blow pipe 30, and the protrusion height h of such a ring-shaped block body is also described above.
- the block body 81 is set so as to protrude from the outlet opening of the tuyere 22 toward the center of the flow path axis.
- the cross-sectional shape of the block body 81 and the ring-shaped block body is a rectangular cross section.
- the block body 81A of the first modification shown in FIG. 2 has an isosceles triangular cross-sectional shape, and the flow passage cross-sectional area of the blow pipe 30 gradually decreases toward the blast furnace body 20 on the inclined surface 82.
- the cross-sectional shape prevents a sudden decrease in the cross-sectional area of the flow path.
- the block body 81B of the second modified example shown in FIG. 3 has a wedge-shaped cross-sectional shape, and has a substantially right-angled triangular cross section with an inclined surface 83 formed on the upstream side. Even in the block body 81B having such a wedge-shaped cross section, the flow path cross-sectional area of the blow pipe 30 gradually decreases toward the blast furnace body 20 on the inclined surface 83, so that a rapid decrease in the flow path cross-sectional area can be prevented.
- the inclined surfaces 82 and 83 described above are not limited to a linear inclination, and may be curved surfaces such as concave surfaces and convex surfaces.
- the blow pipe structure of the present embodiment As described above, if the blow pipe structure of the present embodiment is employed, the flow of pulverized coal 3 blown into the blast furnace body 20 can be concentrated at the center of the flow path. As a result, in the area close to the surface of the tuyere 22 and the inner wall surface of the blow pipe 30, the slag is less likely to adhere due to a decrease in the pulverized coal concentration. Therefore, without adjusting the softening point of the slag contained in the pulverized coal 3, the simple structure in which the resistor body 80 such as the block body 81 or the ring-shaped block body is provided, and there is no special technique or skill. However, it is possible to operate with reduced slag adhesion. 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.
- the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the scope of the invention.
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- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
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Abstract
Description
このような高炉設備において、微粉炭の吹き込み運転をする際、微粉炭として亜瀝青炭や褐炭などの一般的に灰融点が1100~1300℃程度と低い低品位炭を使用した場合には、微粉炭を炉内に吹き込むために使用する約1200℃の熱風中に含まれる酸素と微粉炭の一部とが燃焼反応を示す。これにより、この時に生じる燃焼熱で融点の低い灰(以下、「スラグ」と呼ぶ)がインジェクションランスや羽口内で溶解する。 In the blast furnace facility, raw materials such as iron ore, limestone, and coal are introduced into the main body of the blast furnace, and hot air and pulverized coal (PCI charcoal) as auxiliary fuel are blown from the tuyere at the lower side. It is now possible to produce pig iron from iron ore.
In such blast furnace equipment, when pulverized coal is blown, if low grade coal with a low ash melting point of about 1100-1300 ° C such as subbituminous coal or lignite is used as pulverized coal, pulverized coal The oxygen contained in the hot air of about 1200 ° C. used for blowing the gas into the furnace and a part of the pulverized coal show a combustion reaction. As a result, ash having a low melting point (hereinafter referred to as “slag”) is dissolved in the injection lance or tuyere by the combustion heat generated at this time.
このような問題を解決するため、例えば下記の特許文献1に開示されている従来技術のように、微粉炭中のスラグ軟化点(温度)が低い場合には、高炉内の温度以上の融点となるように軟化点調整処理を行い、羽口へのスラグ付着を防止することが行われている。 The slag thus melted is rapidly cooled by coming into contact with the tuyere that is constantly cooled to protect it from the temperature of the blast furnace. As a result, solid slag adheres to the tuyere, causing a problem of clogging the flow path of the blow pipe.
In order to solve such a problem, when the slag softening point (temperature) in pulverized coal is low, as in the prior art disclosed in
第1の問題は、微粉炭と添加物とを完全に(均一に)混合させることが困難であり、この結果、添加物の混合割合が所定値より低い部分におけるスラグ形成を防止できないことである。
第2の問題は、新たに石灰石や蛇紋岩などの酸化カルシウム(CaO)源が必要となるため、余分なコストが発生することである。 However, in the above-described conventional technique, the following two problems are pointed out.
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.
本発明は、上記の課題を解決するためになされたもので、その目的とするところは、軟化点調整を行わない微粉炭を用いた場合でも、簡単な構造でスラグの付着を抑制できるようにした高炉設備のブローパイプ構造を提供することにある。 From such a background, in the blow pipe structure applied to the blast furnace equipment, it is desired to suppress the adhesion of slag with a simple structure without adjusting the softening point.
The present invention has been made to solve the above-described problems, and the object of the present invention is to suppress the adhesion of slag with a simple structure even when pulverized coal that does not adjust the softening point is used. An object of the present invention is to provide a blow pipe structure for the blast furnace equipment.
本発明の一態様に係るブローパイプ構造は、鉄鉱石から銑鉄を製造する高炉本体の羽口に取り付けられて熱風とともに補助燃料の微粉炭を吹き込み、前記微粉炭のスラグに前記熱風及び/または前記微粉炭の燃焼熱によって溶融する成分を含んでいるブローパイプ構造であって、前記微粉炭をブローパイプ内に投入するインジェクションランスの下流側に、パイプ内壁面側の流路抵抗を増して前記熱風及び前記微粉炭の流れを流路軸中心に集中させる抵抗体が設けられているものである。 In order to solve the above problems, the present invention employs the following means.
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 A blow pipe structure containing a component that is melted by the combustion heat of pulverized coal, wherein the hot blast increases the flow resistance on the inner wall surface side of the pipe on the downstream side of the injection lance for introducing the pulverized coal into the blow pipe. And a resistor for concentrating the flow of the pulverized coal at the center of the flow path axis.
この結果、亜瀝青炭や褐炭などのように灰融点が1100~1300℃程度と低い低品位炭についても、これを原料炭とする改質などにより、補助燃料の微粉炭として使用可能となる。 According to the above-described blow pipe structure of the present invention, the flow of pulverized coal blown into the blast furnace body is concentrated at the center of the flow path, so that slag is less likely to adhere to the tuyere surface and the inner wall surface of the blow pipe. Even if it does not perform, it becomes possible to suppress adhesion of slag with a simple structure of providing a resistor such as a block body or a ring-shaped block body.
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.
本実施形態のブローパイプ構造は、原料炭が低品位炭の微粉炭を羽口から高炉内に熱風とともに吹き込む高炉設備に用いられる。
例えば図4に示すような高炉設備において、鉄鉱石、石灰石及び石炭等の原料1は、原料定量供給装置10から搬入コンベア11を介して高炉本体20の頂部に設けた炉頂ホッパ21に供給される。高炉本体20の下部側壁には、円周方向に略等ピッチで配設された複数の羽口22を備えている。各羽口22には、高炉本体20の内部へ熱風2を供給するブローパイプ30の下流側端部が連結されている。また、各ブローパイプ30の上流側端部は、高炉本体20の内部へ供給する熱風2の供給源である熱風送給装置40と接続されている。 Hereinafter, an embodiment of a blow pipe structure according to the present invention will be described with reference to the drawings.
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.
For example, in a blast furnace facility as shown in FIG. 4, a
微粉炭製造装置50で製造された改質後の微粉炭(改質炭)3は、窒素ガス等の搬送ガス4によりサイクロンセパレータ60へと気体搬送される。気体搬送された微粉炭3は、サイクロンセパレータ60で搬送ガス4を分離した後、貯蔵タンク70内に落下して貯蔵される。このような改質後の微粉炭3は、高炉本体20の高炉吹込炭(PCI炭)として使用される。 In the vicinity of the
The reformed pulverized coal (modified coal) 3 produced by the pulverized
このような微粉炭3は、含酸素官能基(カルボキシル基、アルデヒド基、エステル基、水酸基等)のタール生成基が離脱して大きく減少しているものの、主骨格(C,H,Oを中心とする燃焼成分)の分解(減少)が大きく抑制されている。このため、高炉本体20の内部に羽口22から熱風2とともに吹き込むと、主骨格中に酸素原子を多く含むとともに、径の大きい細孔によって、熱風2の酸素が炭の内部にまで拡散しやすいだけでなく、タール分が非常に生じにくくなっているので、未燃炭素(煤)をほとんど生じることなく完全燃焼することができる。 A suitable property of the pulverized
Such pulverized
この後、冷却工程に進んだ原料炭は、酸素濃度が2体積%以下の低酸素雰囲気中で冷却(50℃以下)された後、微粉砕工程で微粉砕(粒径:77μm以下(80%パス))されることによって容易に製造される。 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.
Thereafter, 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 μm or less (80%) Pass)) and is easily manufactured.
各ブロック体81は、羽口22の出口開口より流路軸中心方向に突出して設けられている。また、各ブロック体81は、複数が協働することにより、例えば図1(b)に示すように、羽口22の出口開口(高炉本体20の内部)から見てパイプ内壁面の全周をカバーするように配置されている。 The illustrated
Each
このようなブロック体81は、流路軸方向位置をずらして、周方向へ等ピッチに4~16個程度を設置することにより、流路外側(内壁面側)の流路抵抗となって流動を妨げる抵抗体80として機能する。 Each
換言すれば、各抵抗要素のブロック体81は、それぞれを円周方向に適宜回転させることにより、ユニット毎の位置が円周方向にずれた状態となるので、このような抵抗要素を流路軸方向に間隔を持って複数ユニット配置すれば、高炉本体20の内部から見てパイプ内壁面の全周がカバーされた状態となる。 That is, as the
In other words, the
図2に示す第1変形例のブロック体81Aは、二等辺三角形の断面形状を有するものであり、傾斜面82においてブローパイプ30の流路断面積が高炉本体20へ向けて徐々に減少するようになっており、流路断面積の急激な減少を防止した断面形状となる。 Further, in the embodiment described above, the cross-sectional shape of the
The
上述した傾斜面82,83は、直線的な傾斜に限定されることはなく、凹面や凸面のような曲面としてもよい。 Similarly, the
The inclined surfaces 82 and 83 described above are not limited to a linear inclination, and may be curved surfaces such as concave surfaces and convex surfaces.
突出量可変機構90は、ブロック体81の突出高さhを可変とするもので、ブロック体81を所望の突出高さhとなるように上下動させる駆動機構であり、例えば油圧や空気圧を用いたシリンダや電動機に連結されたリンク機構等を例示でき、諸条件に応じて適宜選択すればよい。 Further, in the above-described embodiment and its modifications, each
The projecting
従って、微粉炭3に含まれるスラグの軟化点調整を行わなくても、ブロック体81またはリング状ブロック体のような抵抗体80を設けるという簡単な構造により、しかも、特別な技術や技能がなくてもスラグの付着を抑制した操業が可能になる。このため、ブローパイプ30については、例えば羽口22の摩耗寿命までメンテナンス期間の延長が可能となる。 As described above, if the blow pipe structure of the present embodiment is employed, the flow of pulverized
Therefore, without adjusting the softening point of the slag contained in the pulverized
本発明は上述した実施形態に限定されることはなく、その要旨を逸脱しない範囲内において適宜変更することができる。 The component contained in the slag of the pulverized
The present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the scope of the invention.
2 熱風
3 微粉炭(改質炭)
4 搬送ガス
5 銑鉄(溶銑)
10 原料定量供給装置
20 高炉本体
21 炉頂ホッパ
22 羽口
30 ブローパイプ
31 インジェクションランス(ランス)
40 熱風送給装置
50 微粉炭製造装置
60 サイクロンセパレータ
70 貯蔵タンク
80 抵抗体
81,81A,81B ブロック体
82,83 傾斜面
90 突出量可変機構 1
4
10
40 Hot
Claims (5)
- 鉄鉱石から銑鉄を製造する高炉本体の羽口に取り付けられて熱風とともに補助燃料の微粉炭を吹き込み、前記微粉炭のスラグに前記熱風及び/または前記微粉炭の燃焼熱によって溶融する成分を含んでいるブローパイプ構造であって、
前記微粉炭をブローパイプ内に投入するインジェクションランスの下流側に、パイプ内壁面側の流路抵抗を増して前記熱風及び前記微粉炭の流れを流路軸中心に集中させる抵抗体が設けられているブローパイプ構造。 Attached to the tuyere of the blast furnace main body that produces pig iron from iron ore, the pulverized coal of auxiliary fuel is blown together with hot air, and the slag of the pulverized coal contains a component that melts by the hot air and / or the combustion heat of the pulverized coal A blow pipe structure,
A resistor is provided on the downstream side of the injection lance for injecting the pulverized coal into the blow pipe to increase the flow resistance on the inner wall surface side of the pipe and concentrate the flow of the hot air and the pulverized coal at the center of the flow path axis. Blow pipe structure. - 前記抵抗体が前記内壁面に突設された複数のブロック体とされ、
該ブロック体は、前記羽口の出口開口より流路軸中心方向に突出するとともに、複数が協働して前記出口開口からみて前記パイプ内壁面の全周をカバーするように配置されている請求項1に記載のブローパイプ構造。 The resistor is a plurality of block bodies projecting from the inner wall surface,
The block body protrudes from the outlet opening of the tuyere toward the center of the flow path axis, and a plurality of the block bodies cooperate to cover the entire circumference of the inner wall surface of the pipe as viewed from the outlet opening. Item 2. The blowpipe structure according to Item 1. - 前記抵抗体が前記内壁面の全周にわたって突設された1または複数のリング状ブロック体とされ、
該リング状ブロック体は、前記羽口の出口開口より流路軸中心方向に突出している請求項1に記載のブローパイプ構造。 The resistor is one or a plurality of ring-shaped block bodies projecting over the entire circumference of the inner wall surface,
2. The blow pipe structure according to claim 1, wherein the ring-shaped block body protrudes toward the center of the flow path axis from the outlet opening of the tuyere. - 前記ブロック体及び前記リング状ブロック体は、流れ方向上流側に流路断面積を徐々に低減させる傾斜面を備えている請求項2または3に記載のブローパイプ構造。 The blow pipe structure according to claim 2 or 3, wherein the block body and the ring-shaped block body are provided with an inclined surface that gradually reduces the flow path cross-sectional area on the upstream side in the flow direction.
- 前記ブロック体及び前記リング状ブロック体は、流路軸中心方向の突出量可変機構を備えている請求項2から4のいずれか1項に記載のブローパイプ構造。 The blow pipe structure according to any one of claims 2 to 4, wherein the block body and the ring-shaped block body are provided with a protruding amount variable mechanism in a flow path axis center direction.
Priority Applications (4)
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DE112013004606.7T DE112013004606T5 (en) | 2012-09-20 | 2013-09-10 | blow-pipe structure |
KR1020157006957A KR101648323B1 (en) | 2012-09-20 | 2013-09-10 | Blow-pipe structure |
US14/429,308 US20150247212A1 (en) | 2012-09-20 | 2013-09-10 | Blow pipe structure |
CN201380048620.6A CN104641004B (en) | 2012-09-20 | 2013-09-10 | Blower structure |
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JP2012207272A JP6012358B2 (en) | 2012-09-20 | 2012-09-20 | Blow pipe structure |
JP2012-207272 | 2012-09-20 |
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US (1) | US20150247212A1 (en) |
JP (1) | JP6012358B2 (en) |
KR (1) | KR101648323B1 (en) |
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US9556497B2 (en) * | 2012-01-18 | 2017-01-31 | Mitsubishi Heavy Industries, Ltd. | Blast furnace |
US8845940B2 (en) | 2012-10-25 | 2014-09-30 | Carboncure Technologies Inc. | Carbon dioxide treatment of concrete upstream from product mold |
BR112015018518A2 (en) | 2013-02-04 | 2017-07-18 | Coldcrete Inc | system and method for applying carbon dioxide during concrete production |
US9388072B2 (en) | 2013-06-25 | 2016-07-12 | Carboncure Technologies Inc. | Methods and compositions for concrete production |
US10927042B2 (en) | 2013-06-25 | 2021-02-23 | Carboncure Technologies, Inc. | Methods and compositions for concrete production |
US9376345B2 (en) | 2013-06-25 | 2016-06-28 | Carboncure Technologies Inc. | Methods for delivery of carbon dioxide to a flowable concrete mix |
WO2015123769A1 (en) | 2014-02-18 | 2015-08-27 | Carboncure Technologies, Inc. | Carbonation of cement mixes |
CA2943791C (en) | 2014-04-07 | 2023-09-05 | Carboncure Technologies Inc. | Integrated carbon dioxide capture |
AU2017249444B2 (en) | 2016-04-11 | 2022-08-18 | Carboncure Technologies Inc. | Methods and compositions for treatment of concrete wash water |
CA3068082A1 (en) | 2017-06-20 | 2018-12-27 | Carboncure Technologies Inc. | Methods and compositions for treatment of concrete wash water |
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JPH03130312A (en) * | 1989-10-17 | 1991-06-04 | Nippon Steel Corp | Blasting tuyere in blast furnace |
JP2000265205A (en) * | 1999-03-15 | 2000-09-26 | Nippon Steel Corp | Blasting tuyere |
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US4490171A (en) * | 1982-03-31 | 1984-12-25 | Kobe Steel, Limited | Method and apparatus for injecting pulverized fuel into a blast furnace |
JPH05156330A (en) | 1991-12-04 | 1993-06-22 | Sumitomo Metal Ind Ltd | Method for injecting pulverized coal from tuyere in blast furnace |
CN1038430C (en) * | 1995-11-21 | 1998-05-20 | 北京市麒跃技术研究所 | Blast furnace coal powder jet quick-burning method and equipment |
JP4241342B2 (en) * | 2003-11-25 | 2009-03-18 | 三菱重工業株式会社 | Pulverized coal burner and low ash melting point sub-bituminous pulverized coal combustion method |
US20070205543A1 (en) * | 2006-03-06 | 2007-09-06 | Lanyi Michael D | Oxidant-swirled fossil fuel injector for a shaft furnace |
-
2012
- 2012-09-20 JP JP2012207272A patent/JP6012358B2/en not_active Expired - Fee Related
-
2013
- 2013-09-10 WO PCT/JP2013/074412 patent/WO2014045948A1/en active Application Filing
- 2013-09-10 US US14/429,308 patent/US20150247212A1/en not_active Abandoned
- 2013-09-10 CN CN201380048620.6A patent/CN104641004B/en not_active Expired - Fee Related
- 2013-09-10 DE DE112013004606.7T patent/DE112013004606T5/en not_active Withdrawn
- 2013-09-10 KR KR1020157006957A patent/KR101648323B1/en active IP Right Grant
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03130312A (en) * | 1989-10-17 | 1991-06-04 | Nippon Steel Corp | Blasting tuyere in blast furnace |
JP2000265205A (en) * | 1999-03-15 | 2000-09-26 | Nippon Steel Corp | Blasting tuyere |
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JP6012358B2 (en) | 2016-10-25 |
KR101648323B1 (en) | 2016-08-12 |
DE112013004606T5 (en) | 2015-06-11 |
JP2014062290A (en) | 2014-04-10 |
CN104641004A (en) | 2015-05-20 |
US20150247212A1 (en) | 2015-09-03 |
CN104641004B (en) | 2016-08-31 |
KR20150042288A (en) | 2015-04-20 |
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