JPH049413A - Method for charging hard-to-reduce ore into blast furnace - Google Patents
Method for charging hard-to-reduce ore into blast furnaceInfo
- Publication number
- JPH049413A JPH049413A JP11451290A JP11451290A JPH049413A JP H049413 A JPH049413 A JP H049413A JP 11451290 A JP11451290 A JP 11451290A JP 11451290 A JP11451290 A JP 11451290A JP H049413 A JPH049413 A JP H049413A
- Authority
- JP
- Japan
- Prior art keywords
- ore
- blast furnace
- hard
- charging
- charged
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000000446 fuel Substances 0.000 abstract description 9
- 238000006467 substitution reaction Methods 0.000 abstract description 6
- 238000007796 conventional method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
Landscapes
- Manufacture Of Iron (AREA)
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野]
この発明は、燃料比の増加を抑制し得る難還元性鉱石の
高炉への装入方法に関する。DETAILED DESCRIPTION OF THE INVENTION "Industrial Application Field" The present invention relates to a method of charging a refractory ore into a blast furnace that can suppress an increase in fuel ratio.
[従来の技術]
高炉への難還元性の鉱石(ロメラル等)の装入は、燃f
」比の増加等を招くため、あまり使用され寸、使用の場
合には、その配合率を10?6以下に−でいた。難還元
性鉱石を高炉に使用する公開された技術として、特開昭
62−224606号公報がある。これは、難還元性鉱
石を破砕し、粉状にして高炉羽目から炉内に吹込むこと
により、難還元性鉱石を炉頂に装入したときの通気性不
良、還元停滞等の炉況異常の発生を防止して炉況の安定
を図るとともに、燃料比の上昇を防止しようとするもの
である。[Prior art] The charging of refractory ores (Romeral, etc.) into the blast furnace is
Because this leads to an increase in the ratio, it is not often used, and when it is used, the blending ratio is set to 10-6 or less. Japanese Patent Application Laid-Open No. 62-224606 is a published technique for using refractory ores in blast furnaces. This is done by crushing the hard-to-reducible ore, turning it into powder, and injecting it into the furnace through the blast furnace lining. The aim is to stabilize the furnace condition by preventing the occurrence of this, and also to prevent the fuel ratio from increasing.
「発明が解決しようとする課題]
しかしながら、難還元性鉱石を破砕して粉状にすること
は銑鉄コストを上昇させるという問題がある9本発明は
燃料比の増加を防止する難還元性鉱石の装入方法を提供
することを目的とする。“Problems to be Solved by the Invention” However, there is a problem in that crushing the refractory ore into powder increases the cost of pig iron9. The purpose is to provide a charging method.
[課題を解決するための手段]
本発明は上記のような目的を達成しようとするもので、
還元率が30%以下の難還元性鉱石を高炉に装入する難
還元鉱石の高炉への装入方法において、難還元性鉱石を
高炉の中心部に装入することを特徴とする難還元性鉱石
の高炉への装入方法である。この場合において、難還元
性鉱石を装入する範囲は、炉中心からストックライン炉
内半径の3/4としてもよい。[Means for Solving the Problems] The present invention aims to achieve the above objects,
A method for charging a refractory ore into a blast furnace in which a refractory ore with a reduction rate of 30% or less is charged into a blast furnace, characterized by charging the refractory ore into the center of the blast furnace. This is a method of charging ore into a blast furnace. In this case, the range in which the refractory ore is charged may be 3/4 of the stock line furnace radius from the furnace center.
また、難還元性鉱石を焼結鉱と1き換えて高炉の中心部
に装入し、その置換率を20%以下とすると燃料比の増
加を効果的に防止できるのでよい。Furthermore, it is preferable to charge the hard-to-reducible ore into the center of the blast furnace in place of the sintered ore, and to set the replacement rate to 20% or less, since this can effectively prevent an increase in the fuel ratio.
[作用]
焼結鉱の一部を鉱石で置き換えて装入する場合、従来は
、第3図に示すようにコークス層1の上に焼結鉱と鉱石
の混合物を炉の中心から炉壁に亙って一様層厚になるよ
うに装入していた。この場合、焼結鉱との置換率を上げ
てゆくと、第4図に示すように、還元率(R1で表す)
が50%以上の通常鉱石に比べて、RI30%以下の難
還元性鉱石の1換率を上げてゆくほど、燃料比の増加量
(、dFR(kg/l)で表ず)の較差が大きくなる。[Function] When charging a part of sintered ore with ore, conventionally a mixture of sintered ore and ore is poured from the center of the furnace to the furnace wall on top of the coke layer 1, as shown in Fig. 3. It was charged so that the layer thickness was uniform throughout. In this case, as the substitution rate with sinter is increased, the reduction rate (represented by R1) is
Compared to normal ores with RI of 50% or more, as the conversion rate of refractory ores with RI of 30% or less is increased, the difference in fuel ratio increase (not expressed in dFR (kg/l)) becomes larger. Become.
一方、RI 30%以下の難還元性鉱石を高炉の中心部
に装入すると、中心部は還元ポテンシャルが高くなり、
置換率が20%以下であれば、第2図に示すように、R
150%以上の通常鉱石で置換する場合と差が無くなる
。On the other hand, when a refractory ore with an RI of 30% or less is charged into the center of a blast furnace, the reduction potential in the center becomes high;
If the substitution rate is 20% or less, as shown in Figure 2, R
There is no difference compared to when replacing with 150% or more normal ore.
[実施例]
本発明の方法を以下に詳細に説明する。発明者等は、難
還元性の鉱石(RI30%以下)の装入による燃料比増
加量(ΔFR%)によって、通常鉱石(R150%以上
)の場合のJFR%との較差が置換率の増加とともに大
きくなるのを防止するために種々の面から検討した。そ
の検討の中で、高炉炉内のガス流、Coガス濃度分布等
から炉中心の還元ポテンシャルが一番大きいことに着目
し、難還元性鉱石を炉中心に装入することを考えた。第
1図はこの方法で原料を装入したときの炉頂装入物の断
面を模式的に示したもので、コークス1を装入した後に
、炉中心部に第1表に示す難還元性鉱石3を装入し、炉
壁周辺に第1表に示す通常鉱石2を装入するものである
。難還元性鉱石の装入範囲は、ストックラインの炉内半
径をRとすれば炉中心から0.75Hの範囲であればよ
い
難還元性鉱石を焼結鉱と置き換えることとし、その置換
率を増加し、そのときの燃料比の増加!(ΔFR%)の
変化を調査した。その結果を示したものが第2図である
。第2図には、比較のために難還元性鉱石を従来法で装
入したときの相関線を記入しな。[Example] The method of the present invention will be explained in detail below. The inventors determined that, depending on the increase in fuel ratio (ΔFR%) due to the charging of hard-to-reducible ores (RI 30% or less), the difference from JFR% in the case of normal ores (R 150% or more) increases as the substitution rate increases. In order to prevent this from becoming too large, various aspects were considered. During this study, we focused on the fact that the reduction potential at the center of the blast furnace was greatest based on the gas flow and Co gas concentration distribution in the blast furnace, and we considered charging the refractory ore to the center of the furnace. Figure 1 schematically shows the cross section of the top charge when raw materials are charged using this method. Ore 3 is charged, and ordinary ore 2 shown in Table 1 is charged around the furnace wall. The charging range of the hard-to-reducible ore should be within 0.75H from the center of the furnace, where R is the inner radius of the stock line.The hard-to-reducible ore is replaced with the sintered ore, and the replacement rate is Increase, then the fuel ratio increases! (ΔFR%) was investigated. Figure 2 shows the results. In Figure 2, for comparison purposes, draw a correlation line when a refractory ore is charged using the conventional method.
本発明方法によるものは、AFR%は、1換率が20%
までは通常鉱石と同一であり、置換率が20%を越える
と、−FR%の上昇勾配が大きくなり、置換率が30%
になると難還元性鉱石を従来法で装入した場合のΔFR
%と同一になることが分かった。In the case of the method of the present invention, AFR% has a conversion rate of 20%.
Up to 30% is the same as normal ore, and when the replacement rate exceeds 20%, the increasing slope of -FR% becomes large.
ΔFR when reducible ore is charged using the conventional method
It turns out that the percentage is the same.
第1表
[発明の効果コ
本発明は上記のように精成されているから、藺草な装入
法の変更で、還元率30X以下の難還元性鉱石を装入使
用しても、燃料比の増加を通常鉱石と同水準にすること
ができるという効果がある。Table 1 [Effects of the Invention] Since the present invention is purified as described above, even if difficult-to-reducible ores with a reduction rate of 30X or less are charged and used by changing the charging method, the fuel ratio It has the effect of making the increase in the amount similar to that of normal ore.
第1図は本発明方法の説明図、第2図は本発明法による
焼結鉱の置換率とaFR%の関係を示すグラフ図、第3
図は従来方法の説明図、第4図は従来法による焼結鉱の
置換率とAFR%の間係を示すグラフ図である。
1・・・コークス層、
2 ・
通常鉱石層、
3・・難還元鉱石層。Fig. 1 is an explanatory diagram of the method of the present invention, Fig. 2 is a graph showing the relationship between the substitution rate of sintered ore and aFR% by the method of the present invention, and Fig. 3
The figure is an explanatory diagram of the conventional method, and FIG. 4 is a graph diagram showing the relationship between the replacement rate of sintered ore and AFR% according to the conventional method. 1...Coke layer, 2. Ordinary ore layer, 3. Difficult to reduce ore layer.
Claims (3)
する難還元鉱石の高炉への装入方法において、難還元性
鉱石を高炉の中心部に装入することを特徴とする難還元
性鉱石の高炉への装入方法。(1) A method for charging a refractory ore into a blast furnace in which a refractory ore with a reduction rate of 30% or less is charged into a blast furnace, characterized by charging the refractory ore into the center of the blast furnace. A method of charging refractory ore into a blast furnace.
する難還元鉱石の高炉への装入方法において、難還元性
鉱石を焼結鉱と置き換えて高炉の中心部に装入し、その
置換率を20%以下とすることを特徴とする難還元性鉱
石の高炉への装入方法。(2) In the method of charging difficult-to-reducible ores into a blast furnace, in which hard-to-reducible ores with a reduction rate of 30% or less are charged into blast furnaces, hard-to-reducible ores are replaced with sintered ores and charged into the center of the blast furnace. A method for charging refractory ore into a blast furnace, characterized in that the replacement rate is 20% or less.
径の3/4這の範囲に装入する請求項1または請求項2
記載の難還元性鉱石の高炉への装入方法。(3) Claim 1 or Claim 2, wherein the refractory ore is charged within a range of 3/4 of the radius of the stock line furnace from the center of the furnace.
A method for charging the described refractory ore into a blast furnace.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11451290A JPH049413A (en) | 1990-04-27 | 1990-04-27 | Method for charging hard-to-reduce ore into blast furnace |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11451290A JPH049413A (en) | 1990-04-27 | 1990-04-27 | Method for charging hard-to-reduce ore into blast furnace |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH049413A true JPH049413A (en) | 1992-01-14 |
Family
ID=14639610
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11451290A Pending JPH049413A (en) | 1990-04-27 | 1990-04-27 | Method for charging hard-to-reduce ore into blast furnace |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH049413A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2016183373A (en) * | 2015-03-26 | 2016-10-20 | Jfeスチール株式会社 | Blast furnace operation method |
-
1990
- 1990-04-27 JP JP11451290A patent/JPH049413A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2016183373A (en) * | 2015-03-26 | 2016-10-20 | Jfeスチール株式会社 | Blast furnace operation method |
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