JPH0437140B2 - - Google Patents
Info
- Publication number
- JPH0437140B2 JPH0437140B2 JP3393684A JP3393684A JPH0437140B2 JP H0437140 B2 JPH0437140 B2 JP H0437140B2 JP 3393684 A JP3393684 A JP 3393684A JP 3393684 A JP3393684 A JP 3393684A JP H0437140 B2 JPH0437140 B2 JP H0437140B2
- Authority
- JP
- Japan
- Prior art keywords
- powder
- nozzle
- gas
- blowing
- blown
- 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
Links
- 239000000843 powder Substances 0.000 claims description 24
- 239000007789 gas Substances 0.000 claims description 17
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 12
- 238000007664 blowing Methods 0.000 claims description 12
- 239000001301 oxygen Substances 0.000 claims description 12
- 229910052760 oxygen Inorganic materials 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 6
- 230000001590 oxidative effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000011261 inert gas Substances 0.000 description 4
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 2
- 235000011613 Pinus brutia Nutrition 0.000 description 2
- 241000018646 Pinus brutia Species 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/34—Blowing through the bath
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は溶融金属中への粉体吹き込み方法に関
するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for blowing powder into molten metal.
（従来技術）
従来容器内の溶融金属中へ容器の底部又は側壁
から粉体を吹き込む場合、酸素と化学反応を起こ
さない粉体は、酸素ガスをキヤリングガスとして
使用しているが、酸素と化学反応を起こす粉体に
ついては、キヤリングガスとして不活性ガスを使
用している。(Prior art) Conventionally, when blowing powder into molten metal in a container from the bottom or side wall of the container, oxygen gas is used as a carrying gas for powder that does not cause a chemical reaction with oxygen. For powders that cause chemical reactions, inert gas is used as a carrying gas.
しかし不活性ガスは、溶融金属を冷却する能力
を有するため、ノズル孔の閉塞をもたらし、粉体
吹き込みを阻害する。この様な条件下で粉体を吹
き込む方法としては、キヤリングガス圧力を高圧
化し、ノズル先端付着物を圧力で除去する方法が
あるが、この方法では、ノズル先端付着物の生成
とはく離を繰り返し、大きな流量変化をもたら
し、安定した粉体吹き込みは達成出来ない不都合
があつた。 However, since the inert gas has the ability to cool the molten metal, it causes blockage of the nozzle hole and inhibits powder blowing. One method of blowing powder under such conditions is to increase the pressure of the carrying gas and remove the deposits on the nozzle tip using pressure, but this method repeatedly generates and peels off the deposits on the nozzle tip. However, this method had the disadvantage of causing a large flow rate change and making it impossible to achieve stable powder injection.
又他の従来技術としては、特開昭57−149409号
公報に示されるものがある。該公報記載技術は、
上底転炉による鋼精錬において、下ノズルの閉塞
防止を目的の一つとし、その目的達成のため、下
ノズルを２重管構造とし、内管からマツシユルー
ム通気孔保持用酸素を適宜添加し、外管からは
CO2を吹込むものである。 Another conventional technique is disclosed in Japanese Unexamined Patent Publication No. 149409/1983. The technology described in this publication is
In steel refining using an upper-bottom converter, one of the objectives is to prevent blockage of the lower nozzle. To achieve this objective, the lower nozzle has a double-pipe structure, and oxygen is added as appropriate from the inner tube to maintain the pine room ventilation hole. From the outer tube
It injects CO 2 .
更に２重管を用いて、転炉々底から粉体、気体
を吹込むことは種々提案されており、一例として
実開昭57−188856号公報に示されるものがある。
この例は内管からO2を、外管からCO2，Ar，N2
等の不活性ガスを吹込むもので、前記特開昭57−
149409号公報と同様内管から酸化性ガスを吹込む
ものである。 Furthermore, various proposals have been made to blow powder and gas from the bottom of the converter using double pipes, one example of which is shown in Japanese Utility Model Application No. 188856/1983.
In this example, O 2 is supplied from the inner tube, and CO 2 , Ar, N 2 is supplied from the outer tube.
This device injects inert gas such as
Similar to Publication No. 149409, oxidizing gas is blown into the inner tube.
しかしこれらの方法では、下ノズル先端部の附
着物（マツシユルーム）を効果的に融解すること
は難しい。 However, with these methods, it is difficult to effectively melt the appendage (pine room) at the tip of the lower nozzle.
（発明の目的）
本発明はかかる不都合を無くし、粉体を安定し
て吹き込む事が出来るノズル構造及び吹き込み方
法を提供するものである。(Objective of the Invention) The present invention provides a nozzle structure and a blowing method that can eliminate such inconveniences and stably blow powder.
（発明の構成と作用）
本発明はノズルを２重管構造とし、内管から不
活性ガスをキヤリングガスとして粉体を吹き込
み、外管から酸素濃度50％以下の範囲に調整した
酸素と炭素ガスの混合ガスを吹き込む方法によ
り、ノズル先端付着物を一定の大きさに保ち、粉
体吹き出し流路を確保し、かつノズル先端の溶損
を抑制するもので、この方法によれば、キヤリン
グガスの圧力及び流量が安定し、粉体の吹き込み
量も安定する。(Structure and operation of the invention) The present invention has a nozzle with a double tube structure, in which powder is blown into the inner tube using an inert gas as a carrying gas, and oxygen and carbon whose oxygen concentration is adjusted to a range of 50% or less is blown into the outer tube. By blowing a mixed gas into the nozzle, the deposits on the nozzle tip are kept at a constant size, the powder blowing path is secured, and the melting damage of the nozzle tip is suppressed. The gas pressure and flow rate are stabilized, and the amount of powder blown is also stabilized.
外管から吹き込むガスに混合させる酸素は、溶
融金属及び吹き込まれた粉体と発熱化学反応を起
こし、ノズル先端付着物を溶融除去することが出
来る。しかし酸素濃度が50％以上となると、発熱
反応が激しくなり、ノズル先端付着物の溶融はも
ちろん、ノズル本体の溶損をもたらすことがあ
る。 Oxygen mixed with the gas blown from the outer tube causes an exothermic chemical reaction with the molten metal and the blown powder, making it possible to melt and remove deposits on the nozzle tip. However, when the oxygen concentration exceeds 50%, the exothermic reaction becomes intense, which can lead to not only melting of the deposits on the nozzle tip but also melting and damage to the nozzle body.
以下本発明を図面に基づいて説明する。 The present invention will be explained below based on the drawings.
第１図は、転炉の底部に２重管ノズルを取り付
けた全体説明図であり、第２図は、２重管ノズル
の詳細図である。第３図は、粉体キヤリングフロ
ーを示す説明図であり、第４図は、外管用混合ガ
スの配管フローを示す説明図である。 FIG. 1 is an overall explanatory diagram showing a double tube nozzle attached to the bottom of a converter, and FIG. 2 is a detailed diagram of the double tube nozzle. FIG. 3 is an explanatory diagram showing the powder carrying flow, and FIG. 4 is an explanatory diagram showing the piping flow of the mixed gas for the outer tube.
第１図において、ノズル内管１からはArガス
でキヤリングした粉体が吹き込まれ、ノズル外管
２からは、酸素を混合したCO2ガスを吹き込む。
３は転炉である。第２図は、２重管ノズルの詳細
で、内管１とそれを内部に挿通した外管２によつ
て構成する。 In FIG. 1, powder carrier with Ar gas is blown from the inner nozzle tube 1, and CO 2 gas mixed with oxygen is blown from the outer nozzle tube 2.
3 is a converter. FIG. 2 shows details of a double tube nozzle, which is composed of an inner tube 1 and an outer tube 2 inserted into the inner tube.
第３図において、４は粉体ブロータンク、５は
キヤリングガス配管を示す。キヤリアガスを粉体
ブロータンクの上部及び下部粉体切出し部に吹き
込むことにより、ノズル内管１へ粉体を輸送す
る。 In FIG. 3, 4 indicates a powder blow tank, and 5 indicates a carrying gas pipe. Powder is transported to the nozzle inner tube 1 by blowing carrier gas into the upper and lower powder cutting parts of the powder blow tank.
第４図において、酸素流量制御弁６とCO2流量
制御弁７を制御することにより、酸素濃度を50％
以下の任意の混合比として調整し、２重管ノズル
外管２へ吹込む。 In Fig. 4, the oxygen concentration is reduced to 50% by controlling the oxygen flow control valve 6 and the CO 2 flow control valve 7.
Adjust the mixing ratio as shown below and blow into the outer tube 2 of the double tube nozzle.
（発明の効果）
本発明方法により、下ノズル先端の附着物を容
易に効率良く除去できる。(Effects of the Invention) According to the method of the present invention, deposits on the tip of the lower nozzle can be easily and efficiently removed.
第１図は本発明全体の説明図、第２図は２重管
ノズルの詳細説明図、第３図は粉体キヤリングフ
ロー、第４図は外管用混合ガスの配管フローであ
る。
１……内管、２……外管、３……転炉、４……
粉体ブロータンク、５……キヤリングガス配管、
６……酸素用流量調節弁、７……CO2用流量調節
弁。
FIG. 1 is an explanatory diagram of the entire invention, FIG. 2 is a detailed explanatory diagram of a double tube nozzle, FIG. 3 is a powder carrying flow, and FIG. 4 is a piping flow of mixed gas for the outer tube. 1...Inner pipe, 2...Outer pipe, 3...Converter, 4...
Powder blow tank, 5... Carrying gas piping,
6...Oxygen flow rate control valve, 7... CO2 flow rate control valve.
Claims (1)
から粉体を吹き込む方法において、吹き込み用ノ
ズルを２重管構造とし、内管から粉体とそれをキ
ヤリングするガスを吹き込み、外管から酸素濃度
50％以下の範囲で酸素を混合した酸化性ガスを吹
込むことを特徴とする溶融金属中への粉体吹き込
み方法。1 In a method of blowing powder into molten metal in a container from the bottom or side wall of the container, the blowing nozzle has a double pipe structure, the powder and the gas carrying it are blown from the inner pipe, and the oxygen is blown from the outer pipe. concentration
A method for blowing powder into molten metal, which is characterized by blowing in an oxidizing gas containing 50% or less oxygen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3393684A JPS60181214A (en) | 1984-02-24 | 1984-02-24 | Method for blowing powder into molten metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3393684A JPS60181214A (en) | 1984-02-24 | 1984-02-24 | Method for blowing powder into molten metal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60181214A JPS60181214A (en) | 1985-09-14 |
| JPH0437140B2 true JPH0437140B2 (en) | 1992-06-18 |
Family
ID=12400391
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3393684A Granted JPS60181214A (en) | 1984-02-24 | 1984-02-24 | Method for blowing powder into molten metal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60181214A (en) |
-
1984
- 1984-02-24 JP JP3393684A patent/JPS60181214A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60181214A (en) | 1985-09-14 |
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