JPH0689382B2 - Powder injection blast furnace operation method - Google Patents
Powder injection blast furnace operation methodInfo
- Publication number
- JPH0689382B2 JPH0689382B2 JP61040687A JP4068786A JPH0689382B2 JP H0689382 B2 JPH0689382 B2 JP H0689382B2 JP 61040687 A JP61040687 A JP 61040687A JP 4068786 A JP4068786 A JP 4068786A JP H0689382 B2 JPH0689382 B2 JP H0689382B2
- Authority
- JP
- Japan
- Prior art keywords
- pulverized coal
- raceway
- blast furnace
- basic
- amount
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Lifetime
Links
- 239000000843 powder Substances 0.000 title claims description 18
- 238000002347 injection Methods 0.000 title claims description 13
- 239000007924 injection Substances 0.000 title claims description 13
- 238000000034 method Methods 0.000 title description 10
- 239000003245 coal Substances 0.000 claims description 46
- 239000002904 solvent Substances 0.000 claims description 19
- 238000007664 blowing Methods 0.000 claims description 17
- 239000002956 ash Substances 0.000 claims description 13
- 235000005770 birds nest Nutrition 0.000 claims description 13
- 235000005765 wild carrot Nutrition 0.000 claims description 13
- 244000000626 Daucus carota Species 0.000 claims description 11
- 230000002378 acidificating effect Effects 0.000 claims description 10
- 238000011017 operating method Methods 0.000 claims description 4
- 239000010883 coal ash Substances 0.000 claims description 2
- 239000002893 slag Substances 0.000 description 25
- 239000000571 coke Substances 0.000 description 13
- 239000010459 dolomite Substances 0.000 description 11
- 229910000514 dolomite Inorganic materials 0.000 description 11
- 238000002485 combustion reaction Methods 0.000 description 10
- 238000002474 experimental method Methods 0.000 description 8
- 239000007789 gas Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000002844 melting Methods 0.000 description 7
- 230000008018 melting Effects 0.000 description 7
- 229910004298 SiO 2 Inorganic materials 0.000 description 6
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- 238000004380 ashing Methods 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- -1 peridotite Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- 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
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/02—Making special pig-iron, e.g. by applying additives, e.g. oxides of other metals
- C21B5/023—Injection of the additives into the melting part
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は粉体吹込み高炉操業法に係り、特に高炉への微
粉炭吹込み操業法の改良に関する。TECHNICAL FIELD The present invention relates to a powder injection blast furnace operation method, and more particularly to improvement of a pulverized coal injection operation method into a blast furnace.
（従来の技術及び解決しようとする問題点） 高炉内スラグの生成は高炉の安定操業にとって重要であ
り、焼結鉱から生成した滴下スラグはレースウェイで発
生するコークス灰分からのスラグと同化して安定な最終
スラグへと変化させる必要がある。(Prior art and problems to be solved) The generation of slag in the blast furnace is important for stable operation of the blast furnace, and the dripping slag generated from the sinter is assimilated with the slag from the coke ash generated in the raceway. It needs to be changed to a stable final slag.
ところで、最近、高炉への粉体吹込み操業技術の１つと
して微粉炭吹込み操業が確立されるに至り、微粉炭の吹
込み量50〜80kg/t−銑鉄での安定操業が実施されるよう
になった。しかし、微粉炭の吹込み量を上記量よりも多
くすると、レースウェイ周辺で鳥の巣と称される現象が
発生、成長して高炉下部でのガス流れを不良にする場合
が往々にして起こるという問題がある。By the way, recently, pulverized coal injection operation has been established as one of the powder injection operation techniques to the blast furnace, and a stable operation of pulverized coal injection amount of 50 to 80 kg / t-pig iron is carried out. It became so. However, if the amount of pulverized coal injected is larger than the above amount, a phenomenon called a bird's nest occurs around the raceway, and it often happens that it grows and causes poor gas flow in the lower part of the blast furnace. There is a problem.
一方、高炉内反応因子を制御するべく、送風ガスと共に
単独に、酸化鉄等の発熱性粉体を吹き込む方法（特開昭
60−43410号公報）、或いは媒溶剤を吹込む方法（特開
昭60−43412号公報）などが提案されている。On the other hand, in order to control the reaction factors in the blast furnace, a method in which an exothermic powder such as iron oxide is blown alone together with the blast gas (Japanese Patent Laid-Open No. Sho 61-96
No. 60-43410) or a method of blowing a solvent (Japanese Patent Laid-Open No. 60-43412).
しかし乍ら、上記方法はデッドマンの偏り防止やスラグ
性状の改善等の炉況安定化を図る手段にすぎず、微粉炭
吹込みに伴う高炉下部通気の悪化を防止することは全く
考慮されていない。However, the above method is merely a means for stabilizing the furnace condition such as preventing dead man's bias and improving slag properties, and does not consider at all the prevention of deterioration of blast furnace lower part ventilation due to pulverized coal injection. .
本発明は上記従来技術の欠点を解消し、高炉への微粉炭
吹込み操業において、微粉炭吹込み量を増加してもレー
スウェイ周辺での鳥の巣の成長を効果的に阻止し、高炉
下部通気性の悪化の現象を未然に防止でき、安定操業を
可能とする方法を提供することを目的とするものであ
る。The present invention eliminates the above-mentioned drawbacks of the prior art, and in the operation of blowing pulverized coal into a blast furnace, effectively prevents the growth of bird's nests around the raceway even if the amount of pulverized coal injected is increased, It is an object of the present invention to provide a method capable of preventing the deterioration of lower air permeability and allowing stable operation.
（問題点を解決するための手段） 上記目的を達成するため、本発明者は、まず微粉炭吹込
み時の鳥の巣の発生、成長の原因解明に努めた。(Means for Solving Problems) In order to achieve the above object, the present inventor first sought to elucidate the cause of the generation and growth of a bird's nest at the time of blowing pulverized coal.
高炉に吹き込まれる微粉炭には約10％程度の灰分量が含
まれ、この灰分はSiO250〜60％Al2O320〜30％、その他F
e2O3、CaOなどからなり、主に酸性成分で構成されてい
る。The pulverized coal blown into the blast furnace contains about 10% ash, which is SiO 2 50-60% Al 2 O 3 20-30% and other F
It consists of e 2 O 3 and CaO, and is mainly composed of acidic components.
したがって、レースウェイ内の滓化状況は、微粉炭吹込
み量が多くなると、コークス及び微粉炭の灰分からSiO2
−Al2O3主体の酸性成分スラグが増加し、粘性、融点が
上昇し、上部から降下する滴下スラグと同化せず、灰分
のレースウェイ内での適正な滓化が遅れることになり、
その結果、レースウェイ周辺にコークス粉が厚く蓄積し
て厚い鳥の巣が形成され、通気性を阻害する。Therefore, when the amount of pulverized coal injected increases, the slag formation inside the raceway shows that the ash content of coke and pulverized coal causes SiO 2
-Al 2 O 3 -based acidic component slag increases, viscosity, melting point rises, it does not assimilate with dripping slag that drops from the top, and appropriate slag in the raceway of ash will be delayed,
As a result, thick coke powder is accumulated around the raceway to form a thick bird's nest, which impairs air permeability.
第１図はこの状況を模式図的に示したもので、吹込み管
（羽口）１から多量の微粉炭を高炉内に吹込んだ場合、
コークス、微粉炭からの滓化スラグSiO2−Al2O3がレー
スウェイ２内に形成され、その周辺に厚く鳥の巣３が形
成されている。FIG. 1 is a schematic diagram showing this situation. When a large amount of pulverized coal is blown into the blast furnace from the injection pipe (tuyere) 1,
Slag SiO 2 --Al 2 O 3 from coke and pulverized coal is formed in the raceway 2, and a thick bird's nest 3 is formed around the raceway 2.
そこで、本発明者は、その対策として、微粉炭吹込み時
にレースウェイ内で微粉炭の灰分の滓化を促進するに
は、コークス、微粉炭からの酸性成分スラグSiO2−Al2O
3の粘性、融点を下げる必要があることに想到し、CaO、
MgOの塩基性成分からなるバロマイトを微粉状で吹込む
ことを試みた。その結果、コークス、微粉炭の灰分とド
ロマイトがレースウェイ内で同化して低粘性のスラグが
形成され、この滓化した溶融スラグはレースウェイ周辺
で上部から降下する滴下スラグとスムーズに同化し、レ
ースウェイの下方へ滴下していくことが判明した。Therefore, the inventor of the present invention, as a countermeasure, in order to promote the ashing of the ash of the pulverized coal in the raceway at the time of blowing the pulverized coal, coke, an acidic component slag SiO 2 -Al 2 O from the pulverized coal.
I thought that it was necessary to lower the viscosity and melting point of 3 , CaO,
An attempt was made to blow fine particles of baromite, which is a basic component of MgO. As a result, coke, ash of pulverized coal and dolomite are assimilated in the raceway to form a low-viscosity slag, and this molten slag is smoothly assimilated with dripping slag that drops from the top around the raceway, It was found to drip down the raceway.
第２図はこの状況を示すもので、吹込み管１から微粉炭
と微粉ドロマイトを同時に吹込んだ場合、レースウェイ
２内で低粘性スラグCaO−SiO2−Al2O3−MgOが形成さ
れ、スムーズに滴下し、鳥の巣の厚みが薄くなる。FIG. 2 shows this situation, if forme simultaneously blowing the pulverized coal and pulverized dolomite from blow tube 1, low viscosity slag CaO-SiO 2 -Al 2 O 3 -MgO is formed in the raceway 2 , Dripping smoothly, thin the bird's nest.
本発明者は、上記知見に基づき、更に詳細に実験を重ね
た結果、こゝに本発明をなしたものである。The present inventor has made the present invention as a result of further detailed experiments based on the above findings.
すなわち、本発明は、高炉羽口から送風ガスと共に微粉
炭を吹込むに際し、該微粉炭の吹込みと同時に塩基性微
粉媒溶剤を吹込み、微粉炭灰分によりレースウェイ奥に
生成する固着層（通称鳥の巣）を溶剤解除することによ
り、微粉炭吹込み時の炉内圧力を低下させる高炉操業法
において、塩基性微粉媒溶剤の吹込みに際して、塩基性
微粉媒溶剤と微粉炭中の灰分を混合したときの塩基度
（塩基性成分量／酸性成分量）が0.5〜1.3となるように
塩基性微粉媒溶剤の量を調整して吹込むことを特徴とす
る粉体吹込み高炉操業法を要旨とするものである。That is, the present invention, when the pulverized coal is blown together with the blast gas from the tuyere of the blast furnace, a basic fine powder medium solvent is blown at the same time as the pulverized coal is blown, and a fixed layer is formed inside the raceway by the pulverized coal ash ( In a blast furnace operating method in which the pressure inside the furnace is reduced when the pulverized coal is injected by releasing the solvent (commonly known as bird's nest), when the basic pulverized medium solvent is blown, the ash content in the basic pulverized medium solvent and pulverized coal is reduced. Powder blowing blast furnace operating method, characterized in that the amount of basic fine powder medium solvent is adjusted so that the basicity (amount of basic component / amount of acidic component) when mixed is 0.5 to 1.3 Is the gist.
以下に本発明を実施例に基づいて詳細に説明する。The present invention will be described in detail below based on examples.
本発明法に用いる塩基性微粉媒溶剤としては、例えば、
前述のドロマイトのほか、蛇紋岩、カンラン岩、石灰
石、転炉滓などを挙げることができる。媒溶剤は微粉状
で、200メッシュ以下の粒度であるのが好ましい。塊状
では作用が遅く、望ましくない。また、媒溶剤の吹込み
量は、微粉炭中の灰分中の酸性成分量（SiO2、Al2O3）
を考慮して、塩基度（塩基性成分量／酸性成分量）0.5
〜1.3の範囲、好ましくは0.5〜1.1となる量とする。な
お、粘性の低下は塩基度が0.5以下では効果が期待でき
ず、塩基度を1.3以上にしても殆どより以上の粘性低下
が生じない。As the basic fine powder medium solvent used in the method of the present invention, for example,
In addition to the above-mentioned dolomite, serpentine, peridotite, limestone, converter slag, etc. can be mentioned. The solvent medium is preferably in the form of fine powder and has a particle size of 200 mesh or less. The lumpy form has a slow action and is not desirable. In addition, the amount of medium solvent blown is the amount of acidic components in the ash content of pulverized coal (SiO 2 , Al 2 O 3 ).
In consideration of the basicity (basic component amount / acidic component amount) 0.5
The amount is in the range of to 1.3, preferably 0.5 to 1.1. It is to be noted that the effect of decreasing the viscosity cannot be expected when the basicity is 0.5 or less, and even if the basicity is 1.3 or more, almost no more decrease in the viscosity occurs.
上記塩基性微粉媒溶剤の吹込み態様としては、予め微粉
炭と媒溶剤を混合微粉にして使用したり、或いは別々の
吹込み口から同時に高炉内に吹込むことも可能である。As a mode of blowing the basic fine powder medium solvent, it is possible to use fine coal powder and a medium solvent mixed in advance as fine powder, or to blow them into the blast furnace simultaneously from separate blowing ports.
なお、本発明においては、微粉炭の吹込み条件は特に制
限されないことは云うまでもない。Needless to say, the conditions for blowing pulverized coal are not particularly limited in the present invention.
（実施例） 第３図に示す堅型コークス燃焼炉（700mmφ×1600mmH）
を用いて微粉炭とドロマイトの同時吹込み実験を行っ
た。なお、図中、４はコークスを収容した炉本体であ
り、炉壁に設けた吹込み管（羽口）１には、プロパンガ
スを燃料としたホットストーブ５から燃焼ガスを吹込む
と共にエアをキャリアガスとしてフィーダ６から供給し
た微粉炭を吹込む構成を有し、炉壁にはガスアナライザ
７、炉内圧力測定器８、ダストコレクター９が設けられ
ている。(Example) Hard coke combustion furnace shown in Fig. 3 (700 mmφ x 1600 mmH)
The simultaneous injection experiment of pulverized coal and dolomite was conducted by using. In the figure, reference numeral 4 denotes a furnace body containing coke, and a blowing pipe (tuyere) 1 provided on the furnace wall blows combustion gas from a hot stove 5 using propane gas as a fuel and blows air. It has a structure in which pulverized coal supplied from a feeder 6 is blown as a carrier gas, and a furnace wall is provided with a gas analyzer 7, a furnace pressure measuring device 8, and a dust collector 9.
実験としては、上記燃焼炉に10〜15mmの小塊コークスを
充填して、以下に示す基準送風条件でレースウェイ２を
形成させ、燃焼実験を実施した。As an experiment, the above combustion furnace was filled with small coke having a size of 10 to 15 mm, a raceway 2 was formed under the following standard blowing conditions, and a combustion experiment was carried out.
送風量 :160Nm3/hr 送風温度 :1100℃ 羽口前風速 :210m/s 羽口径 :35mmφ 燃焼時間 :120min 微粉炭吹込み量:46kg/hr ドロマイト〃 :5kg/hr なお、ドロマイト吹込み量は、微粉炭吹込み量と微粉炭
中酸性成分量とからスラグの粘度の低下が最も大きい塩
基度1.1になる量とした。これは、第４図に示すよう
に、形成されるスラグの粘性が塩基度1.1で低くなり、
これ以下では急激に高くなり、逆にこれ以上では殆ど変
化がないためである。Blast rate: 160Nm 3 / hr Blast temperature: 1100 ℃ Wind velocity before tuyere: 210m / s Tuyere diameter: 35mmφ Combustion time: 120min Pulverized coal injection rate: 46kg / hr Dolomite 〃: 5kg / hr Based on the amount of pulverized coal blown and the amount of acidic components in the pulverized coal, the basicity was determined to be 1.1, at which the viscosity of the slag was most reduced. This is because the viscosity of the slag formed becomes low at basicity 1.1, as shown in FIG.
This is because if it is less than this, the value becomes sharply higher, and if it is more than this, there is almost no change.
燃焼実験中はレースウェイ直上300mmの高さの所で奥行
方向にガス流れに対する炉内圧損を測定した。また、燃
焼実験の終了後は炉内を解体してレースウェイ近傍の鳥
の巣を取出し、内部の滓化スラグの分析を実施した。During the combustion experiment, the pressure drop inside the furnace was measured in the depth direction at a height of 300 mm just above the raceway. In addition, after the combustion experiment was completed, the inside of the furnace was dismantled, the bird's nest near the raceway was taken out, and the internalized slag was analyzed.
第５図は、微粉炭46kg/hrの吹込み時と、この微粉炭（4
6kg/hr）にドロマイト（5kg/hr）を同時に吹込んだ時の
レースウェイ直上の炉内圧損の測定結果である。これに
より、ドロマイトの同時吹込みによって明らかに圧損が
低下して、ガス流れがスムーズになる現象が認められ
た。この理由は、微粉炭の灰分の滓化時にドロマイトが
同化してスラグの融点の低下、粘性の低下が起こり、鳥
の巣の形成が軽減され、スラグがレースウェイの下部へ
と滴下し、この結果、レースウェイ周辺の通気性が改善
されたためである。Fig. 5 shows when pulverized coal (46 kg / hr) was blown in and the pulverized coal (4
It is the measurement result of the pressure loss inside the furnace directly above the raceway when dolomite (5 kg / hr) was simultaneously injected into 6 kg / hr). As a result, it was confirmed that the simultaneous injection of dolomite clearly reduced the pressure loss and smoothed the gas flow. The reason for this is that when the ash of pulverized coal is converted to slag, dolomite is assimilated, the melting point of the slag is reduced, the viscosity is reduced, the formation of bird nests is reduced, and the slag is dripped to the bottom of the raceway. As a result, the breathability around the raceway is improved.
次に、同じ燃焼炉による別の実験で、コークス灰分の融
点とレースウェイ形状の関係を調べた。その結果を第６
図に示す。同図より、融点が高いとレースウェイ深さは
浅く、縦長の形状を呈することがわかる。これは、レー
スウェイ奥に厚い鳥の巣が形成され、ガス流れが炉壁側
へ偏流することを示している。これに対し、ドロマイト
のような塩基性成分を吹込んで、コークスや微粉炭由来
の酸性成分を同化させ、融点を下げることにより、安定
なレースウェイ形状を維持でき、通気性の改善効果が期
待できることが確認された。Next, in another experiment using the same combustion furnace, the relationship between the melting point of coke ash and the raceway shape was investigated. The result is No. 6
Shown in the figure. From the figure, it can be seen that when the melting point is high, the raceway depth is shallow and the shape becomes vertically long. This indicates that a thick bird's nest is formed at the back of the raceway and the gas flow is lopsided toward the furnace wall. On the other hand, by blowing a basic component such as dolomite to assimilate the acidic component derived from coke and pulverized coal and lowering the melting point, a stable raceway shape can be maintained, and the effect of improving breathability can be expected. Was confirmed.
（発明の効果） 以上詳述したように、本発明によれば、高炉への微粉炭
吹込み操業において、微粉炭吹込みと同時にドロマイト
等の塩基性媒溶剤を、塩基性微粉媒溶剤と微粉炭中の灰
分を混合したときの塩基度（塩基性成分量／酸性成分
量）が0.5〜1.3となるように塩基性微粉媒溶剤の量を調
整して吹込むものであるから、コークス、微粉炭がレー
スウェイで燃焼して生成するスラグの粘性を制御、改善
することができ、レースウェイでの鳥の巣の形成が著減
し、したがって、スラグがレースウェイの下部へとスム
ーズに滴下してレースウェイ周辺の通気性を改善するこ
とができる。特に微粉炭吹込み量を増加しても、上記効
果により安定した操業が可能とする。(Effects of the Invention) As described in detail above, according to the present invention, in the operation of blowing pulverized coal into the blast furnace, the basic medium solvent such as dolomite is mixed with the basic fine powder medium solvent and the fine powder at the same time as the pulverized coal injection. The coke and pulverized coal are laced because the basic fine powder solvent is adjusted and blown so that the basicity (basic component amount / acidic component amount) when the ash in the charcoal is mixed is 0.5 to 1.3. It can control and improve the viscosity of the slag produced by burning on the way, significantly reducing the formation of bird nests on the raceway, thus allowing the slag to drip smoothly to the bottom of the raceway. It is possible to improve the breathability of the surrounding area. In particular, even if the amount of pulverized coal injected is increased, stable operation is possible due to the above effects.
第１図は従来法による微粉炭単味吹込み時のレースウェ
イ状況を示す図、 第２図は本発明法による微粉炭、塩基性微粉媒溶剤同時
吹込み時のレースウェイ状況を示す図、 第３図は本発明の一実施例において使用した堅型コーク
ス燃焼炉を示す図、 第４図はスラグの塩基度と粘性の関係を示す図、 第５図は上記燃焼炉実験による微粉炭単味吹込み時とド
ロマイト添加吹込み時の炉内圧の変化を示す図、 第６図はコークス灰分の融点とレースウェイ形状の関係
を示す図である。 １……吹込み管（羽口）、２……レースウェイ、 ３……鳥の巣、４……燃焼炉、 ５……ホットストーブ、６……微粉炭フィーダ、 ７……ガスアナライザー、８……炉内圧力測定器、 ９……ダストコレクター。FIG. 1 is a diagram showing a raceway situation when a pulverized coal is simply blown by a conventional method, and FIG. 2 is a diagram showing a raceway situation when a pulverized coal and a basic pulverized medium solvent are simultaneously blown by the method of the present invention, FIG. 3 is a diagram showing a rigid coke combustion furnace used in an embodiment of the present invention, FIG. 4 is a diagram showing a relationship between basicity and viscosity of slag, and FIG. 5 is a pulverized coal simple substance obtained by the above combustion furnace experiment. FIG. 6 is a diagram showing changes in the furnace pressure at the time of taste blowing and dolomite addition blowing, and FIG. 6 is a diagram showing the relationship between the melting point of coke ash and the raceway shape. 1 ... Blowing pipe (tuyere), 2 ... raceway, 3 ... bird's nest, 4 ... combustion furnace, 5 ... hot stove, 6 ... pulverized coal feeder, 7 ... gas analyzer, 8 …… Furnace pressure measuring instrument, 9 …… Dust collector.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 岡本 晋也 兵庫県加古川市平岡町高畑151−19 (56)参考文献 特開 昭61−23708（ＪＰ，Ａ) 特公 昭57−48607（ＪＰ，Ｂ２) 特公 昭59−7327（ＪＰ，Ｂ２) ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Shinya Okamoto 151-19 Takahata, Hiraoka-cho, Kakogawa-shi, Hyogo (56) References JP-A 61-23708 (JP, A) JP-B 57-48607 (JP, B2) ) Japanese Patent Publication Sho 59-7327 (JP, B2)
Claims (1)
むに際し、該微粉炭の吹込みと同時に塩基性微粉媒溶剤
を吹込み、微粉炭灰分によりレースウェイ奥に生成する
固着層（通称鳥の巣）を溶解除去することにより、微粉
炭吹込み時の炉内圧力を低下させる高炉操業法におい
て、塩基性微粉媒溶剤の吹込みに際して、塩基性微粉媒
溶剤と微粉炭中の灰分を混合したときの塩基度（塩基性
成分量／酸性成分量）が0.5〜1.3となるように塩基性微
粉媒溶剤の量を調整して吹込むことを特徴とする粉体吹
込み高炉操業法。1. When a pulverized coal is blown from a tuyere of a blast furnace together with blast gas, a basic fine powder medium solvent is blown at the same time as the pulverized coal is blown, and a fixed layer (commonly called as a so-called "fixed layer" formed inside the raceway by the pulverized coal ash content. In a blast furnace operating method in which the pressure inside the furnace during pulverized coal injection is reduced by dissolving and removing the bird's nest), the basic pulverized medium solvent and ash in the pulverized coal are removed when the basic pulverized medium solvent is injected. A powder blowing blast furnace operating method characterized in that the amount of basic fine powder medium solvent is adjusted so that the basicity (amount of basic component / amount of acidic component) when mixed is 0.5 to 1.3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61040687A JPH0689382B2 (en) | 1986-02-26 | 1986-02-26 | Powder injection blast furnace operation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61040687A JPH0689382B2 (en) | 1986-02-26 | 1986-02-26 | Powder injection blast furnace operation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62199706A JPS62199706A (en) | 1987-09-03 |
| JPH0689382B2 true JPH0689382B2 (en) | 1994-11-09 |
Family
ID=12587459
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61040687A Expired - Lifetime JPH0689382B2 (en) | 1986-02-26 | 1986-02-26 | Powder injection blast furnace operation method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0689382B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005207817A (en) * | 2004-01-21 | 2005-08-04 | Nippon Steel Corp | Method for evaluating the transportability of pulverized coal |
| JP2014043605A (en) * | 2012-08-25 | 2014-03-13 | Nippon Steel & Sumitomo Metal | Blast furnace operation method with oil palm shell carbon |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08134516A (en) * | 1994-11-09 | 1996-05-28 | Shoji Sakurai | Blast furnace operation method |
| KR100442638B1 (en) * | 2000-10-09 | 2004-08-02 | 주식회사 포스코 | Fabrication method of fines cleaning substance and Fines cleaning method in blast furnace |
| JP2005307303A (en) * | 2004-04-23 | 2005-11-04 | Jfe Steel Kk | Blast furnace operation method |
| JP6261173B2 (en) * | 2013-02-22 | 2018-01-17 | 株式会社神戸製鋼所 | Blast furnace operation method |
| KR101759333B1 (en) * | 2016-08-11 | 2017-07-18 | 주식회사 포스코 | Apparatus for destroying bird's nest in blast furnace |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6043403B2 (en) * | 1982-03-31 | 1985-09-27 | 新日本製鐵株式会社 | Blast furnace operation method using pulverized coal injection |
| DE3223157C2 (en) * | 1982-06-22 | 1985-11-28 | C. Reichert Optische Werke Ag, Wien | Mirroring device |
| JPS6043412A (en) * | 1983-08-15 | 1985-03-08 | Kawasaki Steel Corp | Method for operating blast furnace by blowing powder |
| JPS6123708A (en) * | 1984-07-13 | 1986-02-01 | Kawasaki Steel Corp | Method for operating powder blow to blast furnace and device therefor |
-
1986
- 1986-02-26 JP JP61040687A patent/JPH0689382B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005207817A (en) * | 2004-01-21 | 2005-08-04 | Nippon Steel Corp | Method for evaluating the transportability of pulverized coal |
| JP2014043605A (en) * | 2012-08-25 | 2014-03-13 | Nippon Steel & Sumitomo Metal | Blast furnace operation method with oil palm shell carbon |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62199706A (en) | 1987-09-03 |
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