JPH01191713A - Operation of blast furnace - Google Patents
Operation of blast furnaceInfo
- Publication number
- JPH01191713A JPH01191713A JP1575088A JP1575088A JPH01191713A JP H01191713 A JPH01191713 A JP H01191713A JP 1575088 A JP1575088 A JP 1575088A JP 1575088 A JP1575088 A JP 1575088A JP H01191713 A JPH01191713 A JP H01191713A
- Authority
- JP
- Japan
- Prior art keywords
- width
- distribution
- coke
- blast furnace
- fuel ratio
- 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
- 239000000571 coke Substances 0.000 claims abstract description 27
- 238000011017 operating method Methods 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 2
- 239000000446 fuel Substances 0.000 abstract description 14
- 238000000034 method Methods 0.000 abstract description 7
- 239000003245 coal Substances 0.000 abstract description 5
- 238000002485 combustion reaction Methods 0.000 abstract description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 3
- 239000001301 oxygen Substances 0.000 abstract description 3
- 229910052760 oxygen Inorganic materials 0.000 abstract description 3
- 238000001069 Raman spectroscopy Methods 0.000 abstract description 2
- 230000001276 controlling effect Effects 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- 229910000805 Pig iron Inorganic materials 0.000 abstract 1
- 239000008187 granular material Substances 0.000 abstract 1
- 238000004611 spectroscopical analysis Methods 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 13
- 238000005087 graphitization Methods 0.000 description 6
- 239000002184 metal Substances 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/24—Test rods or other checking devices
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
Abstract
Description
【発明の詳細な説明】 「発明の目的」 （産業上の利用分野） この発明は高炉の操業方法に関するものである。[Detailed description of the invention] "Purpose of invention" (Industrial application field) This invention relates to a method of operating a blast furnace.
（従来の技術）
従来、高炉内におけるコークスを採取してコークスの熱
履歴を調らべる方法としては、採取した試料の粒度調整
を行い、次いで弗酸もしくは塩酸により一週間程度脱灰
処理した後、Ｘ線回折により約３０分程の時間を要し結
晶子ＬＣ（００２）、Ｌａ（１１０）等を測定する方法
があった。(Conventional technology) Conventionally, the method of collecting coke in a blast furnace and investigating the thermal history of the coke was to adjust the particle size of the sample, and then decalcify it with hydrofluoric acid or hydrochloric acid for about a week. Thereafter, there was a method of measuring crystallites LC (002), La (110), etc. by X-ray diffraction, which took about 30 minutes.
然し乍ら一点のコークスの熱履歴を知るのに、前述のよ
うに準備から測定まで長時間を要するので、試料群とし
てコークス粒子の熱履歴を分布として把握しようとする
概念は存在しなかった。However, as mentioned above, it takes a long time from preparation to measurement to determine the thermal history of a single point of coke, so there was no concept of understanding the thermal history of coke particles as a sample group as a distribution.
そのため羽口先レースウェイ内のコークスの熱履歴の分
布を炉内解析の手段として利用する試みは全（存在しな
かった。Therefore, there have been no attempts to utilize the distribution of the thermal history of coke in the tuyere raceway as a means of in-furnace analysis.
（発明が解決しようとする問題点）
前述したように、Ｘ線回折による測定方法は、試料の調
整、測定に長時間を要するので、高炉内のコークスを点
として熱履歴を知ることはできたが、炉内解析に利用す
る試料群としてのデータは得られないという致命的な欠
陥があった。(Problems to be solved by the invention) As mentioned above, the measurement method using X-ray diffraction requires a long time to prepare and measure the sample, so it was possible to determine the thermal history using the coke in the blast furnace as a point. However, there was a fatal flaw in that it was not possible to obtain data for the sample group used for in-core analysis.
本発明は、レーザーラマン分光法において測定されるグ
ラファイト構造の散乱スペクトルが、温度に依存するこ
とが大きいと云う先人の知見をもとにして、脱灰処理を
必要とせず短時間に多数点の測定を可能とする、高炉内
コークスの熱履歴の分布を推定する方法の発明が本発明
の出願人の社内において完成したのに伴ない具体的な高
炉操業法として創案されたものであり、前述のコークス
の熱履歴の分布を炉内解析の指針とする高炉操業法を提
供することを目的とする。The present invention is based on the knowledge of our predecessors that the scattering spectrum of graphite structures measured in laser Raman spectroscopy is highly dependent on temperature. It was created as a specific blast furnace operating method in conjunction with the completion of the invention of a method for estimating the distribution of thermal history of coke in a blast furnace, which enables the measurement of The purpose of this study is to provide a blast furnace operating method that uses the above-mentioned coke thermal history distribution as a guideline for furnace interior analysis.
「発明の構成」
（問題点を解決する手段）
前述の目的を達成するために、本発明者等は、送風羽口
先のレースウェイ内の粉粒コークスを採取し、その熱履
歴の分布から中心値と半価幅を求め、中心値を１７００
〜２１００℃、半価幅を３０〜１７０℃となるように、
操業条件を制御することを特徴とする高炉操業法。"Structure of the Invention" (Means for Solving Problems) In order to achieve the above-mentioned object, the present inventors collected coke particles in the raceway at the tip of the blast tuyere, and based on the distribution of its thermal history, Find the value and half width, and set the center value to 1700.
~2100℃, half width 30~170℃,
A blast furnace operating method characterized by controlling operating conditions.
を蘇に提案する。propose to Su.
（作用）
゛本発明の実施に当っては、先ず羽口先レースウェイ内
の粉粒コークスを採取して、粒子毎の熱履歴の分布を短
時間に知る必要がある。そのためにはマルチチャンネル
ディテクターを有するレーザーラマン分光法により、散
乱スペクトル１３６０（ｍ −’と１５８０Ｃ１１−’
の強度比から黒鉛化度を測定することができる。この黒
鉛化度はコークスの熱履歴と高度の相関がある。黒鉛化
度はコンピューターにより数値化されているから、簡単
なソフトにより熱履歴の分布として情報を得ることがで
きる。(Function) In carrying out the present invention, it is first necessary to sample the pulverulent coke in the tuyere tip raceway and to know the thermal history distribution of each particle in a short time. For this purpose, the scattering spectra of 1360 (m −' and 1580 C11 −'
The degree of graphitization can be measured from the intensity ratio of . This degree of graphitization is highly correlated with the thermal history of coke. Since the degree of graphitization is quantified by a computer, it is possible to obtain information as a distribution of thermal history using simple software.
第２図は黒鉛化度（Ｒ値と）と、熱履歴温度との関係を
示す（マクロ測定）。FIG. 2 shows the relationship between the degree of graphitization (R value) and the thermal history temperature (macro measurement).
第１図は本発明の技術思想を説明するだめの、コークス
の熱履歴の分布を示すものである。縦軸に頻度を横軸に
各粒子の熱履歴をとったものである。本発明者等は別に
２０００℃以上の粒子の占める割合並びに１５００℃以
下の粒子の占める割合を適量に制御する高炉操業法を提
案しているが、それは目的が操業度の維持向上であった
。本発明の目的は燃料比並びに溶銑中のＳｉの低下にあ
るから、単に高温熱履歴もしくは低温熱履歴粒子の量的
規制と異なり、分布の形状が大きな影響を持つことが研
究の結果判明した。FIG. 1 shows the distribution of the thermal history of coke, which serves to explain the technical idea of the present invention. The frequency is plotted on the vertical axis and the thermal history of each particle is plotted on the horizontal axis. The present inventors have separately proposed a blast furnace operation method in which the proportion of particles with a temperature of 2,000 °C or higher and the proportion of particles with a temperature of 1,500 °C or lower are appropriately controlled, but the purpose was to maintain and improve the operating rate. Since the purpose of the present invention is to reduce the fuel ratio and the Si content in hot metal, research has revealed that the shape of the distribution has a large influence, unlike simply regulating the quantity of high-temperature heat history or low-temperature heat history particles.
第１図の例から判るように、熱履歴の分布の中心値は１
９１０℃であるが、本発明においては中心値は１７００
〜２１００℃の間にあり且つ半価幅（中心値の高さのＡ
のところにおける分布の拡がり幅）を３０−１７０℃の
間に規制する必要がある。As can be seen from the example in Figure 1, the center value of the thermal history distribution is 1
910°C, but in the present invention, the central value is 1700°C.
~2100℃ and the half width (A of the height of the center value)
It is necessary to control the spread width of the distribution at 30-170°C.
半価幅が３０℃より狭い場合は、サーマルショックによ
りコークスは大きな粒子に破砕され炉下部の圧損は大き
くなる。一方、半価幅が１７０℃より広い場合には、羽
口先において粉の発生が増大し棚吊り、スリップの回数
が多くなり、炉下部における圧損は増大する。圧損の増
大は燃料比の増大をもたらすことになる（第３〜５図）
。When the half width is narrower than 30°C, the coke is broken into large particles due to thermal shock, and the pressure drop in the lower part of the furnace becomes large. On the other hand, if the half-value width is wider than 170°C, the generation of powder at the tuyere tip increases, the number of shelving and slipping increases, and the pressure loss in the lower part of the furnace increases. An increase in pressure drop will result in an increase in fuel ratio (Figures 3 to 5)
.
又、中心値が２１００℃以上となることは、羽口先のフ
レイムの温度が高いことを意味し、コークスの粉化率が
大きくなり、ガスの通気性は悪化するからガスの利用率
は低下する。−男中心値が１７００℃以下となることは
、フレイム温度が低いことを意味するから、燃料比を上
げざるを得す、燃料比の増大に伴い溶銑中の５ｉｉｌは
上昇するという悪循環を招く （第６図）。In addition, if the center value is 2100°C or higher, it means that the temperature of the flame at the tip of the tuyere is high, which increases the coke pulverization rate and deteriorates gas permeability, resulting in a decrease in gas utilization. . - If the male center value is below 1700℃, it means that the flame temperature is low, so the fuel ratio has to be increased, and as the fuel ratio increases, the 5iil in the hot metal increases, resulting in a vicious cycle ( Figure 6).
発明者等の研究によれば、羽口先レースウェイで採取さ
れるコークス粒子の熱履歴の分布の中心値と羽口先理論
燃焼温度との間には高度の相関があり、しかも近似的に
は理論燃焼温度−２００℃＝中心値の温度、が確認され
ているから、中心値を１７００〜２１００℃内に規制す
るためには、理論燃焼温度を制御する操業条件の変更を
行うことにより操業を管理することができる（第７図）
。According to the research conducted by the inventors, there is a high degree of correlation between the center value of the thermal history distribution of coke particles collected in the tuyere raceway and the theoretical combustion temperature of the tuyere tip. It has been confirmed that combustion temperature - 200℃ = center value temperature, so in order to regulate the center value within 1700 to 2100℃, operations must be managed by changing the operating conditions to control the theoretical combustion temperature. (Figure 7)
.
半価幅を３０〜１７０℃に維持するには微粉炭の吹き込
み量を増大するとよく、これに酸素富化を併用すると更
に効果がある（第８図）。In order to maintain the half width at 30 to 170° C., it is recommended to increase the amount of pulverized coal blown into the coal, and it is even more effective to combine this with oxygen enrichment (Fig. 8).
（実施例）
１、第３〜８図は炉下部圧損１．２ｋｇ／ｃｆｆｌ以下
、燃料比５１０〜５２０ｋｇ／Ｔで中心値を１８００〜
２０００℃、半価幅５０〜１００℃を目標に操業した例
を中心として記載したもので、特許請求の範囲外の数値
は試験的に少数実施したものと理論計算により求めた数
値が含まれる。(Example) 1. Figures 3 to 8 show the central value at 1800 to 1800 with a pressure drop of 1.2 kg/cffl or less in the lower part of the furnace and a fuel ratio of 510 to 520 kg/T.
The description focuses on examples in which operations were carried out with a target of 2000°C and a half-width of 50 to 100°C, and numerical values outside the scope of the claims include those obtained through a small number of experimental runs and those determined by theoretical calculations.
２、 レースウェイから採取された粉粒コークス粒子の
熱履歴の分布の中心値が２１３０℃ の場合の例。2. An example where the center value of the thermal history distribution of pulverulent coke particles collected from a raceway is 2130°C.
一定の操業度を維持するために燃料比５２８ｋｇ ／
Ｔ、溶銑中のＳｉ０．３３％で操業していたが、水蒸気
の使用量を８ｋｇ／Ｔ、追加する操業に切り替えて４時
間後に中心値が２０００℃に下り燃料比５２０ ｋｇ／
Ｔ、 Ｓｉ値０．３０％の通常の操業状態に復帰した
。To maintain a constant operating rate, the fuel ratio is 528kg/
The operation was carried out with 0.33% Si in the hot metal, but after 4 hours after switching to the operation where the amount of steam used was increased to 8 kg/T, the central value dropped to 2000°C and the fuel ratio was 520 kg/T.
It returned to normal operating conditions with a T and Si value of 0.30%.
３、 レースウェイから採取された粉粒コークス粒＊
子の熱履歴の分布において半価幅が１８０℃゛ の場
合の例。3. An example of a thermal history distribution of powdered coke grains collected from a raceway where the half-value width is 180°C.
炉下部の圧損１．３ｋｇ／ａＪ 棚吊り、スリップ指
数１、燃料比５３０ｋｇ／Ｔの使用を余儀なくされてい
たが、酸素富化０．８％増、微粉炭吹込み１５ｋｇ／Ｔ
増、の操業に移行して４時間後に半価幅は１２０℃に復
帰し、燃料比５２０ ｋｇ／Ｔ、溶銑中のＳｉ０．３０
％の通常の操業状態に復帰した。Pressure drop in the lower part of the furnace was 1.3 kg/aJ, hanging on a shelf, slip index 1, and fuel ratio 530 kg/T had to be used, but oxygen enrichment increased by 0.8% and pulverized coal injection was increased by 15 kg/T.
Four hours after shifting to increased operation, the half value width returned to 120°C, the fuel ratio was 520 kg/T, and the Si in the hot metal was 0.30.
% returned to normal operating conditions.
＊ 何れも規制値より外れているが本発明の効果の確認
のために短期間の操業を行なったもの。* All of these are outside the regulation values, but a short-term operation was conducted to confirm the effectiveness of the present invention.
「発明の効果」
以上詳述したように本発明方法による場合には、羽口先
レースウェイより採取された粉粒コークスの熱履歴分布
から、その中心値、半価幅を求め、所定の中心値、半価
幅に入るように羽目周辺の炉下部における操炉条件を制
御するだけですむから、アクションの効きが早く、安定
操業を続行させ乍ら、目的とする燃料比の低下、溶銑中
のＳｉの低下を図ることができる。"Effects of the Invention" As detailed above, in the case of the method of the present invention, the center value and half-width are determined from the thermal history distribution of the powdered coke collected from the tuyere tip raceway, and the predetermined center value is determined. Since it is only necessary to control the operating conditions in the lower part of the furnace around the siding so that it is within the half-value range, the action is quick and stable operation can be continued while reducing the target fuel ratio and reducing the It is possible to reduce Si.
第１図は本発明の技術思想を説明するためのコークス粒
子の熱履歴分布その他を示す図表であり、第２図はコー
クスの黒鉛化度と熱履歴温度との関係、第３図は炉下部
圧損と半価幅の関係、第４図は棚吊りスリップ指数と炉
下部圧損の関係、第５図は燃料比と炉下部圧損の関係、
第６図は燃料比とコークス熱履歴分布の中心値との関係
、第７図はコークス熱履歴分布の中心値と羽口先理論燃
焼温度との関係、第８図は半価幅と微粉炭吹込量との関
係を示すものである。
第 ２［２
τ。
然１引緒（°０）
第 ３ 国
１１ス一ケ幅（００）
第 ｌ 国
１９１０℃Fig. 1 is a chart showing the thermal history distribution of coke particles and other information to explain the technical idea of the present invention, Fig. 2 is a diagram showing the relationship between the degree of graphitization of coke and the thermal history temperature, and Fig. 3 is a chart showing the relationship between the degree of graphitization of coke and the thermal history temperature, and Fig. 3 is a chart showing the thermal history distribution of coke particles and other information to explain the technical idea of the present invention. The relationship between pressure drop and half-value width, Figure 4 shows the relationship between shelf suspension slip index and lower furnace pressure drop, Figure 5 shows the relationship between fuel ratio and lower furnace pressure drop,
Figure 6 is the relationship between the fuel ratio and the center value of the coke heat history distribution, Figure 7 is the relationship between the center value of the coke heat history distribution and the theoretical combustion temperature at the tuyere tip, and Figure 8 is the relationship between the half value width and pulverized coal injection. It shows the relationship with quantity. 2nd [2 τ. 1 draw (°0) 3rd country 11 stroke width (00) 1st country 1910℃
Claims (1)
その熱履歴の分布から中心値と半価幅を求め、中心値を
１７００〜２１００℃、半価幅を３０〜１７０℃となる
ように、操業条件を制御することを特徴とする高炉操業
法。Collect the powder coke in the raceway at the tip of the blast tuyere,
A blast furnace operating method characterized by determining a center value and a half-value width from the distribution of the thermal history, and controlling operating conditions so that the center value is 1700 to 2100°C and the half-value width is 30 to 170°C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1575088A JPH01191713A (en) | 1988-01-28 | 1988-01-28 | Operation of blast furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1575088A JPH01191713A (en) | 1988-01-28 | 1988-01-28 | Operation of blast furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01191713A true JPH01191713A (en) | 1989-08-01 |
Family
ID=11897446
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1575088A Pending JPH01191713A (en) | 1988-01-28 | 1988-01-28 | Operation of blast furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01191713A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007109875A1 (en) * | 2006-03-28 | 2007-10-04 | Tenova Goodfellow Inc. | Infrared light sensors for diagnosis and control of industrial furnaces |
-
1988
- 1988-01-28 JP JP1575088A patent/JPH01191713A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007109875A1 (en) * | 2006-03-28 | 2007-10-04 | Tenova Goodfellow Inc. | Infrared light sensors for diagnosis and control of industrial furnaces |
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