JPS6310204B2 - - Google Patents
Info
- Publication number
- JPS6310204B2 JPS6310204B2 JP9883985A JP9883985A JPS6310204B2 JP S6310204 B2 JPS6310204 B2 JP S6310204B2 JP 9883985 A JP9883985 A JP 9883985A JP 9883985 A JP9883985 A JP 9883985A JP S6310204 B2 JPS6310204 B2 JP S6310204B2
- Authority
- JP
- Japan
- Prior art keywords
- blowing
- gas
- amount
- converter
- skirt
- 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
- 239000007789 gas Substances 0.000 claims description 62
- 238000007664 blowing Methods 0.000 claims description 46
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 2
- 239000011261 inert gas Substances 0.000 description 13
- 229910002091 carbon monoxide Inorganic materials 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 8
- 230000007423 decrease Effects 0.000 description 6
- 238000004880 explosion Methods 0.000 description 6
- 229910000805 Pig iron Inorganic materials 0.000 description 4
- 238000010079 rubber tapping Methods 0.000 description 3
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 208000001408 Carbon monoxide poisoning Diseases 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004904 shortening 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
- C21C5/38—Removal of waste gases or dust
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、吹錬時に発生するCOガスの回収量
を多くするようにした転炉排ガス処理装置の密閉
操業方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a closed operation method for a converter exhaust gas treatment device that increases the amount of CO gas generated during blowing.
（従来技術とその問題点）
精錬時において、転炉からは高温のCOガスが
大量に発生する。このCOガスは、外気と接触す
ると爆発の危険があり、しかも外部に洩れると一
酸化炭素中毒を起すので、非常に危険なガスであ
る。又このCOガスは、有価ガスとして転炉排ガ
ス処理装置により回収される。(Prior art and its problems) During refining, a large amount of high-temperature CO gas is generated from the converter. This CO gas is an extremely dangerous gas, as there is a risk of explosion if it comes into contact with the outside air, and if it leaks outside, it can cause carbon monoxide poisoning. Moreover, this CO gas is recovered as a valuable gas by a converter exhaust gas treatment device.
転炉排ガス処理装置の概略を第２図を用いて説
明すると、転炉１から発生したCOガスは、誘引
送風機７によつてフード３内に誘引され、冷却器
４によつて冷却された後、除塵器５及び６によつ
て防塵され、ダクト９を通して、図示省略のガス
ホルダに有価ガスとして回収される。 To explain the outline of the converter exhaust gas treatment device using FIG. 2, CO gas generated from the converter 1 is drawn into the hood 3 by the induced fan 7, cooled by the cooler 4, and then cooled by the cooler 4. The gas is dust-proofed by dust removers 5 and 6, and is collected as a valuable gas through a duct 9 into a gas holder (not shown).
この転炉排ガス処理装置において、転炉操業は
次のようにして行われる。 In this converter exhaust gas treatment device, the converter operation is performed as follows.
先ず図示省略の高炉で生産された溶銑は、転炉
１に投入される。即ち、スカート２を上昇し、転
炉１を傾動して、該転炉１内に溶銑が投入され
る。（以下受銑工程という。）この受銑工程終了
後、転炉１は直立させられ、スカート２を下降し
て、転炉１とフード３間を密閉にする。 First, hot metal produced in a blast furnace (not shown) is charged into a converter 1. That is, the skirt 2 is raised, the converter 1 is tilted, and hot metal is charged into the converter 1. (Hereinafter referred to as the pig iron receiving process.) After the pig iron receiving process is completed, the converter 1 is stood upright, the skirt 2 is lowered, and the space between the converter 1 and the hood 3 is sealed.
次に酸素吹込みランス１２より転炉１内に純酸
素を吹き込み（以下吹錬という）、精錬を開始す
る。この吹錬によつて、溶銑中の炭素（Ｃ）と吹
込まれた純酸素（Ｏ）とが反応し、高温のCOガ
スが発生すると共に溶銑中の炭素が脱炭され、良
質の鋼となる。 Next, pure oxygen is blown into the converter 1 from the oxygen injection lance 12 (hereinafter referred to as blowing) to start refining. Through this blowing, the carbon (C) in the hot metal reacts with the injected pure oxygen (O), generating high-temperature CO gas and decarburizing the carbon in the hot metal, resulting in high-quality steel. .
又吹錬の初期と吹錬の末期は、CO濃度が低い
ので、ダンパ１０を切換えて放散塔８を通して、
頂部で燃焼の上大気中に放散する。回収されるの
は、吹錬最盛期のCO濃度の高い部分である。 Also, since the CO concentration is low at the beginning and end of blowing, the damper 10 is switched and the CO is passed through the diffusion tower 8.
It burns at the top and dissipates into the atmosphere. What is recovered is the part with high CO concentration at the peak of blowing.
このようにして吹錬が行われ、精錬された溶鋼
は、転炉１より取り出される（以下出鋼という）。
この出鋼の場合も受銑時と同様に、スカート２を
上昇し、転炉１を傾動する。 The blowing is performed in this manner, and the refined molten steel is taken out of the converter 1 (hereinafter referred to as tapping).
In the case of this tapping, the skirt 2 is raised and the converter 1 is tilted, as in the case of receiving pig iron.
上記受銑及び出鋼工程においては、フード３の
下端が開口されるので、誘引送風機７により外気
が吸引され排ガス処理装置内に外気が充満する。
この状態で吹錬を開始した場合は、発生するCO
ガスと装置内に充満している外気との接触によ
り、爆発を起すので、通常は次のようにしてこの
爆発を防止している。即ち、吹錬開始時におい
て、スカート２を上昇して、転炉１の炉口との間
に一定の隙間をもたせ、この隙間より外気を吸引
し、吹錬初期のCO濃度の低いガスを燃焼し、不
活性なCO2ガスを生成する。 In the above-mentioned pig iron receiving and tapping processes, the lower end of the hood 3 is opened, so that outside air is sucked in by the induced blower 7, and the exhaust gas treatment device is filled with outside air.
If blowing is started in this state, the CO generated
Contact between the gas and the outside air filling the device can cause an explosion, so the following steps are usually taken to prevent this explosion. That is, at the start of blowing, the skirt 2 is raised to create a certain gap between it and the furnace opening of the converter 1, and outside air is sucked through this gap to burn the gas with a low CO concentration in the early stages of blowing. and produces inert CO 2 gas.
このように不活性なCO2ガスを生成することに
より、最初に装置内に充満していた外気と、吹錬
により発生してくるCOガスとの間にCO2ガスを
介在させ、排ガス装置内において、COガス→
CO2ガス→外気の形態のガス層を形成し、COガ
スと外気との直接的な接触を防止することによ
り、爆発を防ぐものである。以下上記CO2ガス
（不活性）層をイナートガス層という。又吹錬末
期においても、先行しているCOガスと後続して
吸引されてくる外気との接触を避けるために、吹
錬末期のCO濃度の低いガスを燃焼し、イナート
ガス層を生成する。 By generating inert CO 2 gas in this way, CO 2 gas is interposed between the outside air that initially filled the equipment and the CO gas generated by blowing, and the CO 2 gas is removed inside the exhaust gas equipment. In, CO gas→
This prevents explosions by forming a gas layer in the form of CO 2 gas → outside air and preventing direct contact between CO gas and outside air. Hereinafter, the above CO 2 gas (inert) layer will be referred to as an inert gas layer. Also, at the end of blowing, in order to avoid contact between the preceding CO gas and the subsequently sucked in outside air, the gas with a low CO concentration at the end of blowing is combusted to generate an inert gas layer.
上記これまでの転炉操業において、爆発の危険
性を第１に考えていたために、スカートの上昇
（吹錬末期）又はスカートの下降（吹錬初期）時
期が、イナートガスを生成するに充分な経験的な
タイミングをもつて操作されていた。即ち、吹錬
初期においては、吹錬開始数秒後にスカートを下
降し、又吹錬終了の数秒前にスカートを上昇し
て、イナートガス層を生成するようにしていた。 In the converter operation mentioned above, the risk of explosion was considered first, so the timing of the rise of the skirt (at the end of blowing) or the time of descent of the skirt (in the beginning of blowing) was not sufficient to generate inert gas. It was manipulated with perfect timing. That is, in the early stage of blowing, the skirt was lowered several seconds after the start of blowing, and raised several seconds before the end of blowing to generate an inert gas layer.
然しながら最近では、COガスをできるだけ大
量に回収することが要求されるようになつてきて
いる。このような理由によりイナートガス量をで
きる限り少なくし、COガスの回収量を増すため
の転炉排ガス処理装置の操業方法の開発が急がれ
ているのが実情である。 However, recently there has been a demand for recovering as much CO gas as possible. For these reasons, there is an urgent need to develop operating methods for converter exhaust gas treatment equipment to reduce the amount of inert gas as much as possible and increase the amount of CO gas recovered.
（発明の目的）
本発明は、上記実情に鑑みてなされたものであ
り、COガスの回収量を増大することのできる転
炉排ガス処理装置の密閉操業方法を提供せんとす
るものである。(Object of the Invention) The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide a closed operation method for a converter exhaust gas treatment device that can increase the amount of CO gas recovered.
（発明の構成）
本発明の転炉排ガス処理装置の密閉操業方法
は、吹錬末期において、従来のように安全を見越
して、一定時間後にスカートを上昇するのではな
く、その精錬毎の吹錬の状況に合せてスカートを
上昇し、イナートガス層の生成時間を短くすると
共に、COガス回収時間をできる限り長くするよ
うにしたものであり、予め定められた送酸量と送
酸時間、又は排ガス量、排ガス中のCO2及びCO
濃度、原料中のＣ量から算出される溶鋼中のＣ量
より吹錬終了時間を予測し、吹錬終了直前にスカ
ートを上昇することを特徴とする。(Structure of the Invention) In the closed operation method of the converter exhaust gas treatment equipment of the present invention, at the final stage of blowing, in anticipation of safety, the skirt is not raised after a certain period of time as in the conventional method, but instead of raising the skirt after a certain period of time, the blowing The skirt is raised according to the situation, shortening the generation time of the inert gas layer, and increasing the CO gas recovery time as much as possible. amount, CO 2 and CO in exhaust gas
The blowing end time is predicted from the C content in the molten steel calculated from the concentration and the C content in the raw material, and the skirt is raised immediately before the blowing ends.
（実施例）
本発明の一実施例について詳細に説明する。第
１図は転炉操業時における発生ガス量（Ｇ曲線）、
CO2濃度（CO2曲線）及びCO濃度（CO曲線）を
示す。図において、発生ガス量Ｇは、吹錬開始時
より徐々に増加し、吹錬最盛期で一定ガス量とな
り、吹錬末期において、徐々に減少する。この傾
向は転炉内に投入された溶銑中の炭素量に関係
し、吹錬初期では溶銑中の炭素と吹込まれた酸素
との間の反応速度により徐々に増加し、吹錬末期
では溶銑中の炭素の減少（脱炭）に従つて徐々に
減少する。又CO濃度曲線も同じような理由によ
り同様の傾向を示す。一方CO2濃度曲線は吹錬開
始と共に減少し、最盛期では一定濃度を保ち、吹
錬終了時に上昇する傾向を示す。(Example) An example of the present invention will be described in detail. Figure 1 shows the amount of gas generated during converter operation (G curve),
Shows CO 2 concentration (CO 2 curve) and CO concentration (CO curve). In the figure, the amount of gas generated G gradually increases from the start of blowing, reaches a constant gas amount at the peak of blowing, and gradually decreases at the end of blowing. This tendency is related to the amount of carbon in the hot metal charged into the converter, and at the early stage of blowing, it gradually increases due to the reaction rate between the carbon in the hot metal and the injected oxygen, and at the end of blowing, the amount of carbon in the hot metal increases. It gradually decreases as carbon content decreases (decarburization). The CO concentration curve also shows a similar tendency due to the same reason. On the other hand, the CO 2 concentration curve shows a tendency to decrease as blowing begins, maintain a constant concentration at the peak, and rise at the end of blowing.
従つて、このガス量ＧとCO及びCO2濃度を検
出することにより、吹錬の終期が予測できる。又
溶銑中の炭素量に応じて予め定められる吹込み酸
素量と送酸時間とにより、吹錬開始からの所要時
間が定められ、吹錬の終了時間が把握される。 Therefore, by detecting the gas amount G and the CO and CO 2 concentrations, the end of blowing can be predicted. Further, the time required from the start of blowing is determined by the amount of blown oxygen and the oxygen supply time, which are predetermined according to the amount of carbon in the hot metal, and the time at which the blowing ends is determined.
第２図において、１３は冷却器４の出口に設け
たガス成分検出器、１４はガス流量計である。 In FIG. 2, 13 is a gas component detector provided at the outlet of the cooler 4, and 14 is a gas flow meter.
吹錬最盛時において、ガス成分検出器１３によ
つて検出されたCO及びCO2ガス濃度とガス流量
計１４によつて検出されたガス流量は、操作器１
５に入力される。吹錬最盛期では、スカート２は
そのまゝ密閉状態を保つ。 At the peak of blowing, the CO and CO 2 gas concentrations detected by the gas component detector 13 and the gas flow rate detected by the gas flow meter 14 are determined by the operating device 1.
5 is input. At the peak of blowing, the skirt 2 remains sealed.
吹錬末期において、CO濃度が低下し、CO2濃
度が上昇し、ガス量が減少して、これらの値が吹
錬終了直前のある値になつたとき、操作器１５に
よつてスカート２が上昇せしめられ、外気が吸引
され、イナートガス層が生成される。或いは吹錬
開始時から一定時間経過した時間を操作器１５に
入力し、スカート２を上昇してもよい。又は上記
CO、CO2濃度及びガス量と、吹錬開始からの一
定時間の４つの要素を操作器１５に入力してスカ
ート２を上昇し、外気を吸引してイナートガス層
を生成してもよい。 At the end of blowing, the CO concentration decreases, the CO 2 concentration increases, and the gas amount decreases, and when these values reach a certain value just before the end of blowing, the skirt 2 is controlled by the operating device 15. It is raised, outside air is sucked in, and an inert gas layer is created. Alternatively, the skirt 2 may be raised by inputting into the operating device 15 a certain amount of time that has elapsed since the start of blowing. or above
The four elements of CO, CO 2 concentration, gas amount, and a certain time from the start of blowing may be input into the operating device 15, the skirt 2 may be raised, and outside air may be sucked to generate an inert gas layer.
このようにして、吹錬終了直前にスカート２を
上昇し、必要最少限のイナートガス層を生成す
る。 In this way, the skirt 2 is raised just before the end of blowing to generate the minimum necessary inert gas layer.
（発明の効果）
以上詳述した通り本発明による転炉排ガス処理
装置の密閉操業方法は、CO、CO2濃度及びガス
量を検出し、スカートを上昇するようにしたの
で、吹錬終了直前にイナートガス層を生成するこ
とができた。(Effects of the Invention) As detailed above, the closed operation method of the converter exhaust gas treatment equipment according to the present invention detects CO, CO 2 concentration and gas amount and raises the skirt, so that the exhaust gas is removed just before the end of blowing. We were able to generate an inert gas layer.
又溶銑中の炭素量に応じて定められる送酸量と
炭酸時間により、吹錬終期を予測し、吹錬開始か
ら一定時間経過後にスカートを上昇するようにし
たので、吹錬終了直前にイナートガス層を生成す
ることができた。 In addition, the end of blowing is predicted based on the amount of oxygen fed and carbonation time determined according to the amount of carbon in the hot metal, and the skirt is raised after a certain period of time from the start of blowing, so the inert gas layer is formed just before the end of blowing. was able to generate.
このようにして、吹錬終了直前にイナートガス
を生成するので、イナートガスの生成を爆発防止
に必要な最少限度にとどめ、かつCOガスを最大
限回収することができ、省資源の点で多大な効果
を有する。 In this way, inert gas is generated just before the end of blowing, so the generation of inert gas can be kept to the minimum necessary to prevent explosions, and the maximum amount of CO gas can be recovered, resulting in a great effect in terms of resource conservation. has.
第１図は、吹錬時におけるCO、CO2濃度と発
生ガス量の変化を示す線図、第２図は、転炉排ガ
ス処理装置の全体を示す概略構成図である。
１……転炉、２……スカート、１２……酸素吹
込みランス、１３……ガス成分検出器、１４……
ガス流量検出器、１５……操作器。
FIG. 1 is a diagram showing changes in CO, CO 2 concentration and amount of gas generated during blowing, and FIG. 2 is a schematic diagram showing the entire converter exhaust gas treatment apparatus. 1...Converter, 2...Skirt, 12...Oxygen injection lance, 13...Gas component detector, 14...
Gas flow rate detector, 15...operator.
Claims (1)
密閉操業において、予め定められた送酸量と送酸
時間、又は排ガス量、排ガス中のCO2及びCO濃
度、原料中のＣ量から算出される溶鋼中のＣ量よ
り吹錬終了時間を予測し、吹錬終了直前にスカー
トを上昇することを特徴とする転炉排ガス処理装
置の密閉操業方法。1 Calculated from the predetermined oxygen supply amount and oxygen supply time, or the amount of exhaust gas, CO 2 and CO concentration in the exhaust gas, and the amount of C in the raw material in closed operation where the converter furnace mouth and skirt are sealed. 1. A closed operation method for a converter exhaust gas treatment device, which comprises predicting the end time of blowing based on the amount of C in molten steel and raising the skirt immediately before the end of blowing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9883985A JPS61257409A (en) | 1985-05-09 | 1985-05-09 | Closed operating method for converter gas treatment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9883985A JPS61257409A (en) | 1985-05-09 | 1985-05-09 | Closed operating method for converter gas treatment device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61257409A JPS61257409A (en) | 1986-11-14 |
| JPS6310204B2 true JPS6310204B2 (en) | 1988-03-04 |
Family
ID=14230429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9883985A Granted JPS61257409A (en) | 1985-05-09 | 1985-05-09 | Closed operating method for converter gas treatment device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61257409A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE9800153D0 (en) * | 1998-01-21 | 1998-01-21 | Hoeganaes Ab | Low pressure process |
| CN101892345B (en) * | 2010-07-30 | 2012-07-04 | 中冶南方工程技术有限公司 | Converter coal gas dry-method dedusting system and using method thereof |
-
1985
- 1985-05-09 JP JP9883985A patent/JPS61257409A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61257409A (en) | 1986-11-14 |
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