JPH0765086B2 - Blast furnace operation method - Google Patents
Blast furnace operation methodInfo
- Publication number
- JPH0765086B2 JPH0765086B2 JP2336306A JP33630690A JPH0765086B2 JP H0765086 B2 JPH0765086 B2 JP H0765086B2 JP 2336306 A JP2336306 A JP 2336306A JP 33630690 A JP33630690 A JP 33630690A JP H0765086 B2 JPH0765086 B2 JP H0765086B2
- Authority
- JP
- Japan
- Prior art keywords
- blast furnace
- auxiliary fuel
- pulverized coal
- tuyere
- blowing
- 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
- 238000000034 method Methods 0.000 title claims description 17
- 239000000446 fuel Substances 0.000 claims description 36
- 239000003245 coal Substances 0.000 claims description 21
- 238000007664 blowing Methods 0.000 claims description 17
- 239000000295 fuel oil Substances 0.000 claims description 16
- 238000002347 injection Methods 0.000 description 11
- 239000007924 injection Substances 0.000 description 11
- 239000010742 number 1 fuel oil Substances 0.000 description 4
- 239000000571 coke Substances 0.000 description 3
- 239000003610 charcoal Substances 0.000 description 2
- 238000010344 co-firing Methods 0.000 description 2
- 230000002542 deteriorative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 241000220317 Rosa Species 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Manufacture Of Iron (AREA)
- Blast Furnaces (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、補助燃料を使用する高炉の操業方法に関し、
詳細には複数種類の補助燃料を同時に高炉内へ吹込む高
炉の操業方法に関するものである。TECHNICAL FIELD The present invention relates to a method for operating a blast furnace using an auxiliary fuel,
More specifically, it relates to a method of operating a blast furnace in which a plurality of types of auxiliary fuel are simultaneously blown into the blast furnace.
石油価格の大幅な高騰を契機に、高炉においては補助燃
料として吹込んでいた重油を全面的に中止するオールコ
ークス操業に移行した。その後、高炉操業の安定化とコ
ークスの代替として経済効果の高いことから、微粉炭が
補助燃料として使用されるようになり、現在では、微粉
炭吹込み操業が多数の高炉で採用され、その吹込み量を
増加するための技術開発が活発に行われている。In response to the sharp rise in oil prices, the blast furnace moved to an all-coke operation to completely cancel the heavy oil that was being injected as auxiliary fuel. Since then, pulverized coal has come to be used as an auxiliary fuel because it stabilizes the blast furnace operation and has a high economic effect as a substitute for coke.Currently, the pulverized coal injection operation is adopted in many blast furnaces, and Technology development is being actively conducted to increase the amount of inclusion.
こうした状況のもとで、本出願人もかねてより粉体燃料
の効果的な吹込み方法を確立すべく鋭意研究開発を進め
てきており、先に、微粉炭等の粉体燃料の吹込み量を、
微粉炭比で100kg/t−ｐ以上に増加しても、熱風の送風
圧力の上昇やその変動が抑制された高炉への粉体燃料吹
込み方法を提案した。（特願平２−36874号参照） 〔発明が解決しようとする課題〕 ところで、微粉炭等の粉体燃料を補助燃料として使用す
る高炉操業の場合、補助燃料の需要バランスの制約か
ら、あるいは微粉炭吹込み設備の故障、保全などの時
に、複数種類の補助燃料（例えば微粉炭と重油など）を
同時に高炉内へ吹込むことが行われる。この場合、従来
のように微粉炭吹込み量が、例えば微粉炭比75kg/t−ｐ
前後であれば、熱風の送風圧力の上昇やその変動を極力
抑制して高炉操業が行われてきたが、上記特願平２−36
874号に記載されている、複数本の補助燃料吹込み用バ
ーナを高炉羽口内に設けて微粉炭吹込量を増加させた高
炉の操業においては未だ実績がなく、例えば微粉炭吹込
み量が、微粉炭比100kg/t−ｐ以上の操業で、燃焼性の
異なる重油を同時に高炉内へ吹込む際の、最適な高炉の
操業方法についてはよく判っていないのが実情である。Under these circumstances, the applicant of the present invention has long been making diligent research and development to establish an effective injection method of powdered fuel. To
We proposed a method for injecting powdered fuel into a blast furnace that suppresses the rise and fluctuation of the blowing pressure of hot air even when the pulverized coal ratio is increased to 100 kg / t-p or more. (See Japanese Patent Application No. 2-36874) [Problems to be Solved by the Invention] In the case of blast furnace operation in which a powdered fuel such as pulverized coal is used as an auxiliary fuel, due to the restriction of the demand balance of the auxiliary fuel or the fine powder. At the time of failure or maintenance of the charcoal blowing facility, a plurality of types of auxiliary fuels (for example, pulverized coal and heavy oil) are simultaneously blown into the blast furnace. In this case, the pulverized coal injection amount is 75 kg / t-p as in the conventional case, for example.
Before and after, the blast furnace operation was carried out while suppressing the rise and fluctuation of the blowing pressure of hot air as much as possible.
No. 874, a plurality of auxiliary fuel injection burners are provided in the tuyere of the blast furnace to increase the pulverized coal injection amount, but there is no actual result in the operation of the blast furnace, for example, the pulverized coal injection amount is In the actual situation, when operating a pulverized coal ratio of 100 kg / t-p or more and blowing heavy oil of different combustibility simultaneously into the blast furnace, the optimum blast furnace operation method is not well understood.
そこで、本発明は、上記の事情に鑑み、複数本の補助燃
料吹込み用バーナを高炉羽口内に有する高炉において、
複数種類の補助燃料を同時に高炉内へ吹込むような場合
に、熱風の送風圧力の上昇やその変動を抑制した高炉の
操業方法を提供することを目的とするものである。Therefore, the present invention, in view of the above circumstances, in a blast furnace having a plurality of auxiliary fuel injection burners in the tuyere of the blast furnace,
It is an object of the present invention to provide a method for operating a blast furnace, which suppresses an increase in the blowing pressure of hot air and fluctuations thereof when a plurality of types of auxiliary fuels are simultaneously blown into the blast furnace.
上記の目的を達成するために、本発明に係わる高炉の操
業方法は、高炉羽口または高炉羽口に連接された熱風吹
込み用ブローパイプの壁に貫通させて複数本の補助燃料
吹込み用バーナを設け、これら補助燃料吹込み用バーナ
を介して補助燃料を熱風と共に吹込む高炉の操業方法で
あって、複数種類の補助燃料を、補助燃料毎に独立の高
炉羽口より吹込むものである。In order to achieve the above-mentioned object, a method for operating a blast furnace according to the present invention is a method for injecting a plurality of auxiliary fuels by penetrating through a wall of a blast furnace tuyere or a hot air blowing blow pipe connected to the blast furnace tuyere. A method of operating a blast furnace in which a burner is provided and the auxiliary fuel is blown together with hot air through these auxiliary fuel blowing burners, and a plurality of types of auxiliary fuel are blown from independent tufts of the blast furnace for each auxiliary fuel.
以下、本発明を詳細に説明する。 Hereinafter, the present invention will be described in detail.
第１図は、本発明方法に適用される高炉羽口の構造の一
例を示す概要図である。(1)および(2)は補助燃料吹込み
用バーナであって、このバーナ(1)，(2)は、ブローパイ
プ(3)を貫通し対称に配置してある。またそのバーナ先
端は、ブローパイプ(3)と水冷羽口(4)の境界面より下流
側の羽口(4)内へ臨ませて配置してある。尚、図中、(5)
は羽口(4)の内周面を被覆する断熱スリーブ、(6)はクー
ラー、(7)は高炉の炉壁を示す。FIG. 1 is a schematic view showing an example of the structure of a blast furnace tuyere applied to the method of the present invention. (1) and (2) are burners for auxiliary fuel injection, and these burners (1) and (2) penetrate the blow pipe (3) and are arranged symmetrically. The tip of the burner is arranged so as to face the tuyere (4) on the downstream side of the boundary surface between the blow pipe (3) and the water-cooled tuyere (4). In the figure, (5)
Is a heat insulating sleeve that covers the inner peripheral surface of the tuyere (4), (6) is a cooler, and (7) is the furnace wall of the blast furnace.
特願平２−36874号に記載した発明方法では、上記の構
造の高炉羽口を高炉に取りつけ、２本の補助燃料吹込み
用バーナ(1)，(2)より、微粉炭等の補助燃料を高炉内へ
吹込むことによって、熱風の送風圧力の上昇やその変動
を抑制して微粉炭比100kg/t−ｐ以上の微粉炭吹込みを
可能とした。そしてその後、微粉炭の需給バランスか
ら、微粉炭の一部を重油に代えて操業するに際し、安定
した炉況を得るには、高炉羽口の一方の補助燃料吹込み
用バーナ(1)の微粉炭に代えて燃焼性の良い重油を吹込
み、羽口(4)内で混焼させた方が望ましいと考え、混焼
を試みたところ、送風圧力が約0.1kg／cm２送風圧力変
動が約4.5それぞれ上昇し、むしの炉況が悪くなった。
この原因は、重油を混焼させると、燃焼性の良い重油が
羽口(4)内または羽口(4)の出口近傍で燃焼し、これによ
り微粉炭も急速に燃焼し、ガス温度の上昇とガス容積の
増加を招く結果、羽口(4)部での流速が高まって圧力上
昇が生じるためと考えられる。In the invention method described in Japanese Patent Application No. 2-36874, the blast furnace tuyere having the above structure is attached to the blast furnace, and the auxiliary fuel such as pulverized coal is supplied from the two auxiliary fuel injection burners (1) and (2). By blowing the blast furnace into the blast furnace, it is possible to suppress the rise and fluctuation of the blowing pressure of hot air and to blow the pulverized coal with a pulverized coal ratio of 100 kg / t-p or more. After that, from the balance of supply and demand of pulverized coal, in order to obtain a stable furnace condition when part of the pulverized coal is replaced with heavy oil, in order to obtain a stable furnace condition, the powder of the auxiliary fuel injection burner (1) on one side of the tuyere of the blast furnace is used. It was thought that it would be preferable to blow heavy oil with good combustibility instead of charcoal and co-firing it in the tuyere (4). When I tried co-firing, the blast pressure was about 0.1 kg / cm 2 The blast pressure fluctuation was about 4.5. Each rose, and the condition of the furnace became worse.
The reason for this is that when heavy oil is mixed and burned, heavy oil with good combustibility burns in the tuyere (4) or near the exit of the tuyere (4), which also causes pulverized coal to burn rapidly and increase the gas temperature. It is considered that as a result of increasing the gas volume, the flow velocity at the tuyere (4) increases and the pressure rises.
そこで、微粉炭を吹込む羽口(4)と重油を吹込む羽口(4)
とを別々にして両燃料を高炉内に吹込んだ結果、送風圧
力および送風圧力変動とも等カロリーの微粉炭のみを吹
込んだ時と殆ど変わらずに微粉炭と重油の同時吹込みが
できた。Therefore, tuyere (4) blowing pulverized coal and tuyere (4) blowing heavy oil.
As a result of injecting both fuels into the blast furnace with separate and, it was possible to inject pulverized coal and heavy oil at the same time with almost the same blast pressure and fluctuations in blast pressure as when only pulverized coal with equal calories was blown. .
上記第１図に示す構造の高炉羽口を高炉に取りつけ、高
炉操業途中で微粉炭と重油の両補助燃料をそれぞれ独立
の高炉羽口から吹込み、補助燃料の置換を実施した。第
２図は、その時の５日間の高炉操業推移を示すグラフ図
である。The blast furnace tuyere having the structure shown in FIG. 1 was attached to the blast furnace, and during the operation of the blast furnace, both auxiliary fuels of pulverized coal and heavy oil were blown from the independent blast furnace tuyere to replace the auxiliary fuel. FIG. 2 is a graph showing the transition of blast furnace operation for 5 days at that time.
第２図より明らかなように、図における１日目は、微粉
炭比110〜120kg/t−ｐおよび重油比約40kg/t−ｐで操業
し、２日目からは、微粉炭比85〜90kg/t−ｐおよび重油
比約60kg/t−ｐで操業し、４日目から５日目には、微粉
炭比を85kg/t−ｐと100kg/t−ｐの間で、また重油比を6
0kg/t−ｐと50kg/t−ｐの間で変化する操業を行った
が、風圧指数、炉内圧損には殆ど変化が観られず、むし
ろ炉内圧損は低下が観られる。またこのような補助燃料
の置換を実施した期間中においてもコークス比を約５kg
/t−ｐ低下させる操業が行えた。このようなことで、高
炉操業途中で微粉炭と重油の両補助燃料をそれぞれ独立
の高炉羽口から吹込むことにより、炉況を悪化させるこ
となく微粉炭に代えて重油を吹込むことができた。As is clear from FIG. 2, on the first day in the figure, the pulverized coal ratio was 110 to 120 kg / t-p and the heavy oil ratio was about 40 kg / t-p, and from the second day, the pulverized coal ratio was 85 to 90kg / t-p and heavy oil ratio of about 60kg / t-p were operated, and from the 4th day to the 5th day, the pulverized coal ratio was between 85kg / t-p and 100kg / t-p, and the heavy oil ratio was 6
Although the operation varied between 0 kg / t-p and 50 kg / t-p, there was almost no change in the wind pressure index and furnace pressure loss, but rather the reactor pressure loss decreased. In addition, the coke ratio is approximately 5 kg even during the period when such replacement of auxiliary fuel is carried out.
The operation to lower / tp was performed. In this way, by blowing both pulverized coal and heavy oil auxiliary fuels from the independent blast furnace tuyere during blast furnace operation, it is possible to inject heavy oil instead of pulverized coal without deteriorating the furnace conditions. It was
以上説明したように、本発明の高炉の操業方法によれ
ば、熱風の送風圧力の上昇やその変動を抑制して且つ炉
況を悪化させることなく、複数種類の補助燃料を高炉へ
同時に吹込む高炉操業ができる。As described above, according to the method for operating a blast furnace of the present invention, a plurality of types of auxiliary fuel are blown into the blast furnace at the same time while suppressing an increase in the blowing pressure of hot air and its fluctuation and without deteriorating the furnace condition. Blast furnace operation is possible.
第１図は、本発明方法に適用される高炉羽口の構造の一
例を示す概要図、第２図は、本発明方法を適用した５日
間の高炉操業推移を示すグラフ図である。 (1)，(2)……補助燃料吹込み用バーナ (3)……ブローパイプ、(4)……水冷羽口 (5)……断熱スリーブ、(6)……クーラー (7)……炉壁FIG. 1 is a schematic diagram showing an example of the structure of a tuyere of a blast furnace applied to the method of the present invention, and FIG. 2 is a graph showing a blast furnace operation transition for 5 days to which the method of the present invention is applied. (1), (2) …… Burner for auxiliary fuel injection (3) …… Blow pipe, (4) …… Water cooling tuyere (5) …… Insulation sleeve, (6) …… Cooler (7) …… Furnace wall
Claims (2)
吹込み用ブローパイプの壁に貫通させて複数本の補助燃
料吹込み用バーナを設け、これら補助燃料吹込み用バー
ナを介して補助燃料を熱風と共に吹込む高炉の操業方法
であって、複数種類の補助燃料を、補助燃料毎に独立の
高炉羽口より吹込むことを特徴とする高炉の操業方法。1. A plurality of auxiliary fuel blowing burners are provided so as to penetrate through a wall of a blast furnace tuyere or a hot-air blowing blow pipe connected to the blast furnace tuyere, and the auxiliary fuel blowing burners are provided through these auxiliary fuel blowing burners. A method for operating a blast furnace in which auxiliary fuel is blown together with hot air, wherein a plurality of types of auxiliary fuel are blown from independent tufts in the blast furnace for each auxiliary fuel.
の一つが重油であることを特徴とする請求項１に記載の
高炉の操業方法。2. The method of operating a blast furnace according to claim 1, wherein one of the plurality of types of auxiliary fuel is pulverized coal and the other is heavy oil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2336306A JPH0765086B2 (en) | 1990-11-29 | 1990-11-29 | Blast furnace operation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2336306A JPH0765086B2 (en) | 1990-11-29 | 1990-11-29 | Blast furnace operation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04202613A JPH04202613A (en) | 1992-07-23 |
| JPH0765086B2 true JPH0765086B2 (en) | 1995-07-12 |
Family
ID=18297750
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2336306A Expired - Lifetime JPH0765086B2 (en) | 1990-11-29 | 1990-11-29 | Blast furnace operation method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0765086B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2523918B2 (en) * | 1990-02-16 | 1996-08-14 | 株式会社神戸製鋼所 | Injection method of powdered fuel into blast furnace |
-
1990
- 1990-11-29 JP JP2336306A patent/JPH0765086B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04202613A (en) | 1992-07-23 |
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