JPS63157811A - Converter for preventing corrosion of furnace wall by secondary combustion - Google Patents
Converter for preventing corrosion of furnace wall by secondary combustionInfo
- Publication number
- JPS63157811A JPS63157811A JP61303366A JP30336686A JPS63157811A JP S63157811 A JPS63157811 A JP S63157811A JP 61303366 A JP61303366 A JP 61303366A JP 30336686 A JP30336686 A JP 30336686A JP S63157811 A JPS63157811 A JP S63157811A
- Authority
- JP
- Japan
- Prior art keywords
- converter
- exhaust gas
- blowing
- refractory
- carbonaceous material
- 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.)
- Granted
Links
- 230000007797 corrosion Effects 0.000 title abstract description 8
- 238000005260 corrosion Methods 0.000 title abstract description 8
- 238000002485 combustion reaction Methods 0.000 title description 4
- 239000003575 carbonaceous material Substances 0.000 claims abstract description 35
- 239000000843 powder Substances 0.000 claims description 20
- 238000007664 blowing Methods 0.000 abstract description 34
- 239000007789 gas Substances 0.000 abstract description 30
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 8
- 229910000831 Steel Inorganic materials 0.000 abstract description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052760 oxygen Inorganic materials 0.000 abstract description 7
- 239000001301 oxygen Substances 0.000 abstract description 7
- 239000010959 steel Substances 0.000 abstract description 7
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 229910052742 iron Inorganic materials 0.000 abstract description 5
- 239000011230 binding agent Substances 0.000 abstract description 2
- 229910052799 carbon Inorganic materials 0.000 abstract description 2
- 239000003245 coal Substances 0.000 abstract description 2
- 239000000571 coke Substances 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 description 14
- 239000002184 metal Substances 0.000 description 14
- 239000011819 refractory material Substances 0.000 description 14
- 230000003628 erosive effect Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000009841 combustion method Methods 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 229910000805 Pig iron Inorganic materials 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 238000005261 decarburization Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- Y02W30/54—
Landscapes
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
この発明は、炉壁耐火物の溶損を防止すると共に、カロ
リーの高い排ガスの回収を可能にした転炉に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a converter that prevents melting of furnace wall refractories and enables recovery of high-calorie exhaust gas.
〈背景技術〉
転炉製鋼法の発達に伴い鉄鋼産業に“銑鋼−貫体制”が
確立されて久しく、鋼の生産能率は飛躍的な向上を遂げ
てきたが、近年、世界的に景気の低迷期を迎えるに及ん
で綱の需要も一次の無制限状態から着実な安定化傾向を
たどるようになってきた。<Background technology> With the development of the converter steel manufacturing method, the "pig steel throughput system" was established in the steel industry for a long time, and steel production efficiency has improved dramatically. However, in recent years, the global economy has As we entered a period of stagnation, the demand for ropes began to follow a steady trend of stabilization from the initially unlimited state.
このようなことから、最近、高炉銑の生産量抑制策が採
られる傾向となり、同時に布中スクラップが大量に出回
ってその価格も安定化してきたこともあって、転炉製鋼
原料としてのスクラップの使用割合を増加し、更に鉄鉱
石やマンガン鉱石をも配合する転炉操業法の確立が検討
され始めてきた。For these reasons, there has been a recent tendency to take measures to control the production of blast furnace pig iron, and at the same time, a large amount of cloth scrap has become available and its price has stabilized, resulting in the use of scrap as a raw material for converter steelmaking. Studies have begun to consider establishing a converter operating method that increases the proportion of iron ore used and also incorporates iron ore and manganese ore.
中でも、溶銑処理により溶銑の熱源が低下した場合のス
クラップ比率上昇対策や鉄鉱石、マンガン鉱石等の増配
対策等としての“転炉への熱付与技術”が注目を集めて
おり、特に「転炉における脱炭操業時に発生したＣＯガ
スを炉内でＣＯ□ガスにまで燃焼させる“二次燃焼法”
によって所要熱量を確保するのが最も有効かつ実用的で
ある」として、通常の主送酸ノズルの他にＣＯガス燃焼
用の０２送給ノズルを配設した上吹ランスを用いて転炉
操業を行う方法や、炉肩部（絞り部）にＣＯガス燃焼用
の０２送給ノズルを斜め下方に向けて配置した転炉を使
用する方法等、“二次燃焼法”に関する様々な提案がな
されている。Among these, "heat application technology to converter" is attracting attention as a measure to increase the scrap ratio when the heat source of hot metal decreases due to hot metal processing and as a measure to increase the production of iron ore, manganese ore, etc. "Secondary combustion method" in which the CO gas generated during decarburization operations is combusted into CO□ gas in the furnace.
It is most effective and practical to secure the required amount of heat by Various proposals have been made regarding the "secondary combustion method," including a method using a converter in which the 02 feed nozzle for CO gas combustion is placed diagonally downward on the shoulder (throttle part) of the furnace. There is.
しかしながら、上述のような“二次燃焼法”を採用する
と
＋ａｌ 炉内での排ガス温度が上昇して耐火物の溶損
が増加する、
（ｂｌ 排ガス中のＣＯ含有量が低下するためエネル
ギー回収の面で不利である、
等の新たな問題が生じ、操業コストの低減が厳しく問わ
れる転炉製鋼において上記“二次燃焼法”の実用化が達
成されたとは決して言い難い状況にあった。However, if the above-mentioned "secondary combustion method" is adopted, the temperature of the exhaust gas in the furnace will increase and the erosion of the refractories will increase. New problems arose, such as disadvantageous aspects, and it was difficult to say that the above-mentioned "secondary combustion method" had been put to practical use in converter steelmaking, where reductions in operating costs were a critical issue.
しかも、このような“二次燃焼法”を積極的に促進しな
い場合でも、操業時の転炉自排ガス温度は１８００℃前
後となるためにやはり耐火物溶損の懸念は絶えず付きま
とっており、その十分な対策が待ち望まれていたのであ
る。Furthermore, even if such a "secondary combustion method" is not actively promoted, the temperature of the converter's own exhaust gas during operation is around 1800°C, so there is always concern about refractory erosion. Sufficient countermeasures have been awaited.
〈問題点を解決するための手段〉
本発明者等は、上述のような観点から、通常操業時はも
とより、二次燃焼比率を上昇させた操業時においても炉
内耐火物の溶損を殆んど生じることがなく、しかもエネ
ルギー回収率の点でも十分に満足し得る転炉を提供すべ
く鋭意研究を重ねた結果、以下に示されるような知見を
得たのである。<Means for Solving the Problems> From the above-mentioned viewpoint, the present inventors have made it possible to minimize the erosion of refractories in the furnace not only during normal operation but also during operation with an increased secondary combustion ratio. As a result of extensive research in order to provide a converter that would not cause this to occur and would also be fully satisfactory in terms of energy recovery rate, the following findings were obtained.
即ち、
Ａ）何れの形式の転炉であっても同様であるが、炉内高
温排ガスが直接接触する部位の耐火物内面に炭素質物質
をコーティングすると、高温排ガス中のＣＯ，が前記炭
素質物質コーティング中のＣと
Ｃ＋ＣＯ２→ ２ Ｃ０
なる吸熱反応を起こして耐火物近傍の温度を低下させる
こと、
Ｂ） この吸熱反応による耐火物近傍の温度低下１よ耐
火物溶損の防止に十分なものであり、これによって二次
燃焼比率を上昇させた転炉操業を行ったとしても炉内耐
火物の溶損は顕著に抑制されること、
Ｃ） Ｌかも、前記吸熱反応によって排ガス中のｃｏ
ガスが増加するので排ガスのカロリーが上昇し、エネル
ギー回収の点からも極めて有利となること、
Ｄ） 更に、耐火物内面に炭素質物質をコーティングす
ることに加えて転炉の焼目下部に羽口を設け、転炉操業
時に該羽目から炭素質物質粉末を吹き込むと、この炭素
質物質粉末中のＣも高温排ガス中のＣＯｔと前記式で示
した吸熱反応を起こして炉内耐火物近傍の温度を低下す
るので、耐火物の溶損防止効果が一段と向上し、排ガス
のカロリーも一層上昇すること。That is, A) The same applies to any type of converter, but if the inner surface of the refractory in the area that is in direct contact with the high-temperature exhaust gas in the furnace is coated with a carbonaceous material, the CO in the high-temperature exhaust gas will be absorbed by the carbonaceous material. The temperature near the refractory is lowered by causing an endothermic reaction with C in the substance coating: C + CO2 → 2 C0, and B) The temperature reduction near the refractory due to this endothermic reaction is sufficient to prevent corrosion of the refractory. Therefore, even if the converter is operated with an increased secondary combustion ratio, the melting loss of the refractories in the furnace will be significantly suppressed.
D) Furthermore, in addition to coating the inner surface of the refractory with a carbonaceous material, the calorie content of the exhaust gas increases due to the increase in gas, which is extremely advantageous from the point of view of energy recovery. When a port is provided and carbonaceous material powder is injected through the port during converter operation, the carbon in the carbonaceous material powder also causes an endothermic reaction with COt in the high-temperature exhaust gas as shown in the above equation, causing the carbonaceous material near the refractories in the furnace to react. Since the temperature is lowered, the effect of preventing melting and damage of refractories is further improved, and the calorie content of exhaust gas is further increased.
この発明は、上記知見に基づいてなされたものであり、
「第１図に示されるように、炉壁１内面の高温ガスに曝
される部位を炭素質物質でコーティング２して転炉（転
炉の基本的な形式は特定されるものではない）を構成す
るか、或いは第２図に示されるように、炉壁１内面の高
温ガスに曝される部位を炭素質物質でコーティング２す
ると共に、炉口３の下部に炭素質物質粉末吹き込み用羽
目４を設けて転炉を構成することにより、炉内耐火物の
溶損を効果的に防止し、かつカロリーの高い排ガスの回
収を可能ならしめた」点、
に特徴を有するものである。This invention has been made based on the above knowledge, and is based on the following: ``As shown in Fig. 1, the area of the inner surface of the furnace wall 1 exposed to high temperature gas is coated with a carbonaceous material 2 to create a converter (converter). (The basic type of the furnace is not specified) or, as shown in FIG. By configuring a converter by providing a slat 4 for blowing carbonaceous material powder at the lower part of the furnace mouth 3, it is possible to effectively prevent the melting of the refractories in the furnace and to recover high-calorie exhaust gas. It is characterized by the following points:
ここで、第１図並びに第２図において、符号５で示され
るものは上吹酸素ランス、６は底吹羽口、７はスラグ、
そして８は溶銑又は溶鋼をそれぞれ示す。Here, in FIGS. 1 and 2, the reference numeral 5 indicates a top-blown oxygen lance, 6 indicates a bottom-blown tuyere, 7 indicates a slag,
And 8 indicates molten pig iron or molten steel, respectively.
なお、前記「炉壁内面の高温ガスに曝される部位」とは
格別に特定されるものではないが、通常は第１図或いは
第２図で示したような炉口下部付近がこれに該当する。Note that the above-mentioned "area exposed to high-temperature gas on the inner surface of the furnace wall" is not particularly specified, but usually corresponds to the area near the bottom of the furnace mouth as shown in Figures 1 and 2. do.
また、コーティング層を形成する炭素質物質としては−
クスや石炭粉等をあげることができ、コーティングには
、前記炭素質物質粉末をバインダー及び水分と混合した
後吹き付けして炉壁を構成する耐火物の所要部位内面に
塗布する等の手段を採用すれば良い。そして、炭素質物
質吹き込み用羽口から吹き込む炭素質物質としてはコー
クス粉或いは石炭粉等の平均粒径：０、１２５ｎ＋ｍ程
度の粉末が好適である。In addition, the carbonaceous material forming the coating layer is -
For coating, the carbonaceous material powder is mixed with a binder and water, and then sprayed to apply it to the inner surface of the required parts of the refractory material that makes up the furnace wall. Just do it. As the carbonaceous material to be blown in from the tuyeres for blowing carbonaceous material, powders such as coke powder or coal powder having an average particle size of about 0.125n+m are suitable.
ところで、炉口の下部に炭素質物質吹き込み用羽目を設
ける場合には、第２図で示す炉底からの高さ［ＨＬ）を
０．６Ｈｖ≦ＨＬ≦０．９Ｈｖ
（但し、Ｈｖは炉底から炉口までの高さ）の範囲とし、
また該羽目の水平角度〔θ〕を一１５６≦ θ ≦ １
５゜
範囲に設定するのが良い。なぜなら、炭素質物質吹き込
み用羽口の高さくＨＬ）が炉底から炉口までの高さくＨ
Ｖ）の０．６倍未満であったり、羽目の水平角度〔θ〕
が一１５″を下回ると、排ガス温度の低下によって溶鉄
・スラグへの熱供給が不足がちとなり、一方、前記高さ
ＨＬが０．９Ｈｖを越えたり、〔θ〕が１５°を上回る
と炉内排ガス温度を低下させる効果が不十分となって羽
口設置に見合う耐火物溶損防止効果の向上が期待できな
くなるからである。By the way, when providing a wall for blowing carbonaceous material at the lower part of the furnace mouth, the height [HL] from the hearth bottom shown in Fig. 2 should be set to 0.6Hv≦HL≦0.9Hv (however, Hv is the height from the hearth bottom (height from to the mouth of the furnace),
Also, the horizontal angle [θ] of the grain is -156≦θ≦1
It is best to set it within the 5° range. This is because the height of the tuyere for blowing carbonaceous material (HL) is the height from the furnace bottom to the furnace mouth (H).
V) is less than 0.6 times, or the horizontal angle of the grain [θ]
If the height HL exceeds 0.9Hv or [θ] exceeds 15°, the heat supply to the molten iron and slag tends to be insufficient due to the drop in exhaust gas temperature.On the other hand, if the height HL exceeds 0.9Hv or [θ] exceeds 15°, This is because the effect of lowering the exhaust gas temperature will be insufficient, and it will no longer be possible to expect an improvement in the effect of preventing corrosion of refractories commensurate with the installation of tuyeres.
次いで、この発明を実施例により具体的に説明する。Next, the present invention will be specifically explained with reference to Examples.
〈実施例〉
実施例 １
第１図に示すような１０トン上・底側吹きの複合吹錬転
炉の炉壁内面の耐火物表面に、炉口から’Ａ Ｈｖの深
さに亘って５Ｍの厚さでＣ：８５％。<Example> Example 1 The refractory surface of the inner surface of the furnace wall of a 10 ton top/bottom blowing combined blowing converter as shown in Fig. C at thickness: 85%.
Ｓｉｎｇ：５．２％及びＡβｇｏｓ：３．１％を含む炭
素質粉末を塗布し、この転炉を使用して
溶銑量：８０００ｈｇ、
溶銑温度：１２８０〜１２９５℃、
使用上吹酸素ランス：１２φ×６孔×１５°、吹錬時間
：１５分
なる条件で脱燐溶銑の脱炭処理を行った。Carbonaceous powder containing Sing: 5.2% and Aβgos: 3.1% was applied, and this converter was used to produce hot metal amount: 8000hg, hot metal temperature: 1280-1295℃, top-blown oxygen lance used: 12φ× Dephosphorization hot metal was decarburized under the following conditions: 6 holes x 15°, blowing time: 15 minutes.
一方、比較のため、炭素質物質粉末を内面に塗布しなか
った以外は上記と同様の従来の上・底側吹き複合吹錬転
炉を使用し、同様条件で脱燐溶銑の脱炭処理をも実施し
た。On the other hand, for comparison, a conventional top/bottom blowing combined blowing converter similar to the one described above was used, except that the carbonaceous material powder was not applied to the inner surface, and decarburization of dephosphorized hot metal was carried out under the same conditions. was also carried out.
このときの焼目下部における耐火物表面最高到達温度、
耐火物の溶損量、並びに炉内排ガス成分の測定値を第１
表に示した。なお、耐火物の表面温度は、耐火物表面よ
り３ｎの深さに熱電対をセットして測定した。At this time, the maximum temperature reached on the refractory surface at the bottom of the grill,
The amount of erosion of the refractories and the measured values of the exhaust gas components in the furnace are
Shown in the table. The surface temperature of the refractory was measured by setting a thermocouple at a depth of 3n from the surface of the refractory.
第１表に示される結果からも、炭素質物質を炉壁内面に
コーティングした本発明に係る転炉を使用すると、従来
の転炉を使用した場合に比べて耐火物の溶損量を著しく
低減できることが明らかである。The results shown in Table 1 also show that when the converter according to the present invention, in which the inner surface of the furnace wall is coated with carbonaceous material, is used, the amount of corrosion of refractories is significantly reduced compared to when a conventional converter is used. It is clear that it can be done.
実施例 ２
第１図に示すような１０トン上・底側吹きの複合吹錬転
炉の炉壁内面の耐火物表面に、炉口から’Ａ Ｈｖの深
さに亘って３酊の厚さでＣ：８５％。Example 2 A 10-ton top/bottom blowing combined blowing converter as shown in Fig. 1 was coated with a refractory material on the inner surface of the furnace wall to a depth of 300 mm from the furnace mouth to a depth of 'A Hv. C: 85%.
ＳｉＯ□：５．２％及びＡβｇｏｚＦ３．１％を含む炭
素質粉末を塗布すると共に、炉の上部に炭素質物質粉末
吹き込み用羽目を設置しくＨＬ＝０．８ＨＶ、θ＝１０
°）、この転炉を使用して炭素質物質粉末吹き込み用羽
口から粉コークス（−６０メツシユ、Ｃ量：８８％）を
吹き込みつつ（吹き込み量：６０ｋｇ）、溶銑量：８０
００ｋｆ、
溶銑温度：１２９０〜１３１０℃、
使用上吹酸素ランス：１４φ×３孔×１０°及び９φ×
６孔×２０°１
吹錬時間：１５分
なる条件で脱燐溶銑の脱炭処理を行った。A carbonaceous powder containing 5.2% SiO□ and 3.1% AβgozF was applied, and a slat for blowing carbonaceous material powder was installed in the upper part of the furnace.HL=0.8HV, θ=10
), using this converter, while blowing coke powder (-60 mesh, C amount: 88%) from the tuyere for blowing carbonaceous material powder (injection amount: 60 kg), hot metal amount: 80 kg.
00kf, hot metal temperature: 1290~1310℃, top-blown oxygen lance used: 14φ x 3 holes x 10° and 9φ x
Dephosphorization hot metal was decarburized under the following conditions: 6 holes x 20° 1 blowing time: 15 minutes.
一方、比較のため、炭素質物質粉末を内面に塗布せず、
しかも炭素質物質粉末吹き込み用羽目を設置しなかった
以外は上記と同様の従来の上・底側吹き複合吹錬転炉を
使用し、同様条件で脱燐溶銑の脱炭処理をも実施した。On the other hand, for comparison, without applying carbonaceous material powder to the inner surface,
Moreover, the same conventional top/bottom side blowing combined blowing converter as above was used, except that no lining for blowing carbonaceous material powder was installed, and the decarburization treatment of dephosphorized hot metal was also carried out under the same conditions.
このときの短目下部における耐火物表面最高到達温度、
耐火物の溶損量、並びに炉内排ガス成分の測定値を第２
表に示した。なお、耐火物の表面温度は、実施例１と同
様、耐火物表面より３籠の深さに熱電対をセットして測
定した。At this time, the maximum temperature reached on the refractory surface at the lower part of the short side,
The measured values of the amount of corrosion of the refractory and the components of the exhaust gas in the furnace are
Shown in the table. Note that the surface temperature of the refractory was measured by setting a thermocouple at a depth of three cages from the surface of the refractory, as in Example 1.
第２表に示される結果からも、炭素質物質を炉壁内面に
コーティングすると共に、炭素質物質粉末吹き込み用羽
目を設置した本発明に係る転炉を使用すると、従来の転
炉を使用した場合に比べて耐火物の溶損量を著しく低減
できるばかりか、同時に排ガス中のＣＯ量も上昇させる
ことができ、エネルギー回収面での効果も十分に期待し
得ることも明らかである。The results shown in Table 2 also show that when using the converter according to the present invention, in which the inner surface of the furnace wall is coated with carbonaceous material and a siding for blowing carbonaceous material powder is used, compared to using the conventional converter. It is clear that not only can the amount of erosion of the refractory be significantly reduced compared to the previous method, but also the amount of CO in the exhaust gas can be increased at the same time, and that a sufficient effect in terms of energy recovery can be expected.
実施例 ３
第１図に示すような１０トン上・底側吹きの複合吹錬転
炉の炉壁内面の耐火物表面に、炉口から％Ｈｖの深さに
亘って７鶴の厚さでＣ：８５％。Example 3 The refractory surface of the inner surface of the furnace wall of a 10 ton top/bottom blowing combined blowing converter as shown in Fig. 1 was coated with a thickness of 7 mm from the furnace mouth to a depth of %Hv. C: 85%.
５ｉＯｚ：５．２％及びＡＪｚＯａ：３．１％を含む炭
素質粉末を塗布した。A carbonaceous powder containing 5.2% of 5iOz and 3.1% of AJzOa was applied.
次いで、この転炉を用い、脱燐銑を種湯として５０００
ｋｇのクロム鉱石（全Ｃｒ量：３１％、全Ｆｅ量： ２
０．６％）を溶融還元した。このときの転炉操業条件は
種湯溶銑量：５ｏｏｏｋｇ、
種湯溶銑温度：１２５０℃、
最終溶銑温度：１６００℃、
使用上吹酸素ランス；１２φ×６孔×１５°、吹錬時間
：１３０分
であった。Next, using this converter, 5,000 yen of dephosphorized pig iron was used as seed water.
kg of chromium ore (total Cr content: 31%, total Fe content: 2
0.6%) was melt-reduced. The converter operating conditions at this time were: Seed hot metal amount: 5ookg, Seed hot metal temperature: 1250℃, Final hot metal temperature: 1600℃, Top blowing oxygen lance used: 12φ x 6 holes x 15°, Blowing time: 130 minutes. Met.
一方、比較のため、炭素質物質粉末を内面に塗布しなか
った以外は上記と同様の従来の上・底側吹き複合吹錬転
炉を使用し、同様条件でクロム鉱石の還元処理を実施し
た。On the other hand, for comparison, a conventional top/bottom blowing combined blowing converter similar to the one described above was used, except that the carbonaceous material powder was not applied to the inner surface, and chromium ore was reduced under the same conditions. .
このときの短目下部における耐火物表面最高利達温度、
耐火物の溶損量、並びに炉内排ガス成分の測定値を第３
表に示した。なお、耐火物の表面温度は、耐火物表面よ
り５ｍｌの深さに熱電対をセットして測定した。At this time, the maximum temperature reached on the refractory surface at the lower part of the short side,
The measured values of the amount of erosion of the refractories and the components of the exhaust gas in the furnace are
Shown in the table. The surface temperature of the refractory was measured by setting a thermocouple at a depth of 5 ml from the surface of the refractory.
第３表に示される結果からも明らかなように、この場合
にも、炭素質物質を炉壁内面にコーティングした本発明
に係る転炉を使用すると従来の転炉を使用した場合に比
べて耐火物の溶損量を著しく低減できることが分かる。As is clear from the results shown in Table 3, in this case as well, the use of the converter according to the present invention, in which the inner surface of the furnace wall is coated with carbonaceous material, has better fire resistance than the case of using the conventional converter. It can be seen that the amount of erosion of objects can be significantly reduced.
〈効果の総括〉
上述のように、この発明によれば、既存の転炉をそのま
ま利用して炉壁耐火物の溶損が極力少なく、またカロリ
ーの高い排ガスの回収が可能な転炉を提供することがで
き、転炉操業効率の一層の向上、そして転炉操業コスト
の更なる低減を実現することが可能となるなど、産業上
極めて有用な効果がもたらされるのである。<Summary of Effects> As described above, according to the present invention, it is possible to provide a converter that can use an existing converter as is, cause as little erosion of the furnace wall refractories as possible, and recover high-calorie exhaust gas. This brings about industrially extremely useful effects such as further improvement in converter operating efficiency and further reduction in converter operating costs.
第１図は、本発明に係る「炉壁内面に炭素質物質コーテ
ィングを有する転炉」の−例を示す概略模式図、
第２図は、本発明に係る「炉壁内面に炭素質物質コーテ
ィングを有すると共に、炭素質物質粉末吹き込み用羽目
を備えた転炉」の−例を示す概略模式図である。
図面において、
■・・・炉壁、 ２・・・炭素質物質コーティング層、
３・・・炉口、
４・・・炭素質物質粉末吹き込み用羽目、５・・・上吹
酸素ランス、 ６・・・底吹羽口、７・・・スラグ、
８・・・溶銑又は溶鋼。FIG. 1 is a schematic diagram showing an example of a converter having a carbonaceous material coating on the inner surface of the furnace wall according to the present invention. FIG. 1 is a schematic diagram illustrating an example of a converter having a converter having a carbonaceous material powder and having a lining for blowing carbonaceous material powder. In the drawings, ■...furnace wall, 2...carbonaceous material coating layer,
3... Furnace mouth, 4... Window for blowing carbonaceous material powder, 5... Top blowing oxygen lance, 6... Bottom blowing tuyere, 7... Slag,
8... Hot metal or molten steel.
Claims (2)
でコーティングして成ることを特徴とする転炉。(1) A converter characterized in that a portion of the inner surface of the furnace wall exposed to high temperature gas is coated with a carbonaceous material.
でコーティングすると共に、炉口の下部に炭素質物質粉
末吹き込み用羽口を設けて成ることを特徴とする転炉。(2) A converter characterized in that a portion of the inner surface of the furnace wall exposed to high temperature gas is coated with a carbonaceous material, and a tuyere for injecting carbonaceous material powder is provided at the lower part of the furnace mouth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30336686A JP2541200B2 (en) | 1986-12-19 | 1986-12-19 | Converter for preventing melting of furnace wall due to high temperature gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30336686A JP2541200B2 (en) | 1986-12-19 | 1986-12-19 | Converter for preventing melting of furnace wall due to high temperature gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63157811A true JPS63157811A (en) | 1988-06-30 |
| JP2541200B2 JP2541200B2 (en) | 1996-10-09 |
Family
ID=17920125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30336686A Expired - Fee Related JP2541200B2 (en) | 1986-12-19 | 1986-12-19 | Converter for preventing melting of furnace wall due to high temperature gas |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2541200B2 (en) |
-
1986
- 1986-12-19 JP JP30336686A patent/JP2541200B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2541200B2 (en) | 1996-10-09 |
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