JPS6151608B2 - - Google Patents
Info
- Publication number
- JPS6151608B2 JPS6151608B2 JP16513380A JP16513380A JPS6151608B2 JP S6151608 B2 JPS6151608 B2 JP S6151608B2 JP 16513380 A JP16513380 A JP 16513380A JP 16513380 A JP16513380 A JP 16513380A JP S6151608 B2 JPS6151608 B2 JP S6151608B2
- Authority
- JP
- Japan
- Prior art keywords
- gas
- trailing
- pressure
- switching
- tuyere
- 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
- 238000000034 method Methods 0.000 claims description 28
- 238000007664 blowing Methods 0.000 claims description 16
- 239000002184 metal Substances 0.000 claims description 10
- 238000003723 Smelting Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 135
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 238000005070 sampling Methods 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
- 229910052786 argon Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000009963 fulling Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000007704 transition Effects 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)
Description
【発明の詳細な説明】
本発明は少くとも１個のガス吹込用羽口を底部
に備えた底吹転炉および上吹底吹転炉による金
属、特に鋼の製錬操業における、一連の吹込用ガ
スの切替え制御方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a series of blowing processes in metal, especially steel, smelting operations using bottom-blowing converters and top-blowing converters with at least one gas blowing tuyere at the bottom. The present invention relates to a method for controlling gas switching.
底吹あるいは上吹底吹転炉製鋼法においては、
装入期、精練期、サンプリング期、タツピング期
などの間に、その時々に応じて羽口を通じて吹込
むべきガスの種類を切替える必要がある。例えば
転炉が直立状態にある精錬期においては、酸素が
羽口を通じて転炉内の溶鋼中に吹込まれている
が、精錬期が終了すると酸素を窒素またはアルゴ
ンに切替え転炉を傾倒してサンプリングまたは出
鋼し、このサンプリングまたは出鋼の間に低圧の
窒素またはアルゴンに切替える。 In the bottom-blown or top-blown converter steelmaking process,
During the charging period, scouring period, sampling period, tucking period, etc., it is necessary to change the type of gas to be blown through the tuyere depending on the time. For example, during the refining period when the converter is upright, oxygen is injected into the molten steel inside the converter through the tuyere, but once the refining period is over, the oxygen is switched to nitrogen or argon and the converter is tilted for sampling. or tapping and switching to low pressure nitrogen or argon during this sampling or tapping.
ところで転炉底吹操業では羽口への溶鋼差し込
みを防止するために従来は常に規定値以上のガス
流量を確保する必要があるとされていた。従つて
ガスの切換に際しても、新たに切換えられるべき
ガス（後行ガスという）の、供給導管内での流量
が規定値以上あることを確認した後に、現に吹込
まれつつあるガス（先行ガスという）の供給を遮
断するのが従来の原則である。 By the way, in the bottom-blowing operation of a converter, it was conventionally believed that it was necessary to always ensure a gas flow rate above a specified value in order to prevent molten steel from being inserted into the tuyere. Therefore, when switching gases, after confirming that the flow rate of the gas to be newly switched (referred to as trailing gas) in the supply pipe is greater than the specified value, the gas that is currently being blown in (referred to as leading gas) The conventional principle is to cut off the supply of
このような従来の原則である流量制御を基本と
して転炉内への底吹ガス吹込の切替を制御する方
法として次のような方法が提案されている。 The following method has been proposed as a method for controlling the switching of bottom blowing gas into the converter based on the conventional principle of flow rate control.
第１図はかかる制御方法を実施する転炉底吹の
吹込ガス制御装置の概略説明図である。 FIG. 1 is a schematic explanatory diagram of a converter bottom blowing gas control device that implements such a control method.
図において１は転炉、２は溶鋼、３は羽口、４
は先行ガス（Ａガス）源、４′は後行ガス（Ｂガ
ス）源、５はＡガス用供給導管、５′はＢガス用
供給導管である。Ａガス供給導管５には、Ａガス
圧力計６、流量計７、流量調節弁８、遮断弁９、
逆止弁１０が配設されており、Ｂガス供給導管
５′にも同様にＢガス圧力計６′、流量計７′、流
量調節弁８′、遮断弁９′、逆止弁１０′が配設さ
れている。１１はシーケンスコントローラーおよ
びループコントローラーを組込んだ制御装置であ
る。 In the figure, 1 is a converter, 2 is molten steel, 3 is a tuyere, and 4
4 is a leading gas (A gas) source, 4' is a trailing gas (B gas) source, 5 is an A gas supply conduit, and 5' is a B gas supply conduit. The A gas supply conduit 5 includes an A gas pressure gauge 6, a flow meter 7, a flow control valve 8, a cutoff valve 9,
A check valve 10 is provided, and a B gas pressure gauge 6', a flow meter 7', a flow control valve 8', a cutoff valve 9', and a check valve 10' are also provided in the B gas supply conduit 5'. It is arranged. 11 is a control device incorporating a sequence controller and a loop controller.
この制御系による先行ガス（Ａガス）から後行
ガス（Ｂガス）への切替の態様を第２図により説
明する。 The mode of switching from the leading gas (A gas) to the trailing gas (B gas) by this control system will be explained with reference to FIG. 2.
先行の操業ステータス（先行ステータス）から
後行の操業ステータス（後行ステータス）への遷
移に伴なつて、ＡガスからＢガスへ切替える場合
に、切替前における制御系の状態は、Ａガス系で
は遮断弁９，AV1は全開、流量調節弁８，CVH1
の開度は先行ステータスの規定値への自動制御下
にあり、Ａガス流量（F1）は先行ステータスの規
定値以上であり、他方Ｂガス系では作動状態にな
い（遮断弁９，AV2は全閉）。 When switching from A gas to B gas due to the transition from the preceding operation status (preceding status) to the following operation status (following status), the state of the control system before switching is as follows for the A gas system. Shutoff valve 9, AV 1 is fully open, flow control valve 8, CVH 1
The opening degree of is under automatic control to the specified value of the preceding status, and the A gas flow rate (F 1 ) is greater than or equal to the specified value of the preceding status, while the B gas system is not in the operating state (shutoff valve 9, AV 2 is fully closed).
この状態においてＢガスへの切替指令がステー
タス起動指令として与えられると、Ａガス系の流
量調節弁８，CVH1の弁開度は後行ステータスに
対応する規定値に調整され、この規定値に対応し
て開度が自動制御され、従つて先行ガスの流量
F1は後行ステータスに対応する流量となり、同
時にＢガス系の流量調節弁８′，CVH2の弁開度
も後行ステータスの規定値に調整される。この時
期においてはＡガス系の遮断弁９，AV1の開度は
全開のままであり、Ｂガス系の遮断弁９′，AV2
は全閉状態にある。 In this state, when a switching command to B gas is given as a status activation command, the valve opening degrees of the A gas system flow control valve 8 and CVH 1 are adjusted to the specified value corresponding to the trailing status, and the valve opening degree is adjusted to the specified value corresponding to the trailing status. Correspondingly, the opening is automatically controlled and thus the flow rate of the leading gas
F 1 becomes the flow rate corresponding to the trailing status, and at the same time, the valve openings of the B gas system flow rate control valve 8' and CVH 2 are also adjusted to the specified value of the trailing status. During this period, the A gas system cutoff valve 9, AV 1 remains fully open, and the B gas system cutoff valve 9', AV 2 remains fully open.
is fully closed.
切換指令後、Ｂガス系の遮断弁９′，AV2が全
開され、Ｂガスが導管５′に供給されるとＢガス
系の流量調節弁８′，CVH2の弁開度が後行ステ
ータスの規定値へと自動制御されるに至る。その
際Ｂガスの流量F2が後方ステータスに対応する
規定値以上であることが確認されれば、Ａガス系
の遮断弁９，AV1を全閉として切替を終了する。 After the switching command, the B gas system cutoff valve 9', AV 2 is fully opened, and when B gas is supplied to the conduit 5', the valve opening of the B gas system flow control valve 8', CVH 2 changes to the trailing status. automatically controlled to the specified value. At this time, if it is confirmed that the flow rate F 2 of the B gas is equal to or higher than the specified value corresponding to the rear status, the A gas system cutoff valve 9 and AV 1 are fully closed to complete the switching.
以上は、ガス切替時における後行ガスの流量が
切替のタイミングを失することなく後行ステータ
スの規定値以上であることが確認され得る場合の
ガス切替制御方法の一例であるが、羽口先端は吹
込ガスによる発熱反応あるいは吸熱反応および溶
鋼の激しい流動により、所謂マツシユルームと称
される地金の急激な成長、あるいは縮小ないしは
脱落などの現象が発生しており、またガス圧力の
変動もあることから、後行ガスの流量が安定せ
ず、従つてガス切替が不可能となる場合がある。 The above is an example of a gas switching control method when it can be confirmed that the flow rate of the trailing gas at the time of gas switching is equal to or higher than the specified value of the trailing status without losing the switching timing. Due to the exothermic or endothermic reactions caused by the blown gas and the intense flow of molten steel, phenomena such as rapid growth, shrinkage, or shedding of the metal, known as the so-called pine room, occur, and there are also fluctuations in gas pressure. Therefore, the flow rate of the trailing gas may not be stable, and therefore gas switching may become impossible.
この場合に、後行ガスの流量が安定するまで、
ガス切替を停滞すると、ガス切替のタイミングを
失し、操業のステータスに対応しないガス吹込を
徒らに継続することになるので、溶鋼の目標成分
への調整が不可能になつたりあるいは溶鋼温度の
低下を招くおそれがあるほかに、不必要なガス吹
込を継続するから経済的にも好ましくない。また
製鋼から連続鋳造に至る一連の連続操業の乱れを
惹起し、生産性を低下せしめるというおそれがあ
る。 In this case, until the trailing gas flow rate stabilizes,
If gas switching is stagnant, the timing of gas switching will be lost, and gas injection that does not correspond to the operation status will continue needlessly, making it impossible to adjust the molten steel to the target composition or changing the molten steel temperature. In addition to the risk of causing a drop, it is also economically unfavorable because unnecessary gas injection is continued. Furthermore, there is a fear that the series of continuous operations from steel making to continuous casting may be disrupted, leading to a decrease in productivity.
この場合、後行ガスの流量を早急に所定値に立
上げることが望まれるが、従来はＢガス系の流量
調節弁８′，CVH2の弁開度を大きくし、該弁で
発生している圧力損失を小さくしてこの問題の解
決をはかつていた。 In this case, it is desirable to quickly raise the flow rate of the trailing gas to a predetermined value, but conventionally, the valve opening degree of the B gas system flow rate control valve 8', CVH 2 is increased, and the flow rate of the trailing gas is increased to a predetermined value. This problem was previously solved by reducing the pressure loss caused by the process.
しかしこの方法は、後行ガスの流量は確保され
るが、羽口部圧力が高めに変化し、その後のＡガ
ス系の遮断弁９，AV1を閉じたとき、羽口部圧力
がその瞬間減圧し、溶湯の逆流をみることがあ
る。 However, with this method, although the flow rate of the trailing gas is secured, when the tuyere pressure changes to a high level and the A gas system shutoff valve 9, AV 1 is closed, the tuyere pressure changes at that moment. When the pressure is reduced, backflow of molten metal may be observed.
何れの場合も、従来の切替方法は、流量制御で
圧力制御でないため、あくまでＢガスの流量が後
行ガスステータスの規定値以上維持されることが
前提となつているので、Ａガスを流しつつ、所定
量以上のＢガスを流れを確保する必要があり、こ
のためＢガス圧力を後行ガスステータス圧力より
高めるか、Ａガスの流量を流量調節弁８，CVH1
を絞つて制限することとなり、結果的には、羽口
部圧力を微妙に変化させる。 In either case, since the conventional switching method controls the flow rate and not the pressure, it is assumed that the flow rate of B gas is maintained above the specified value of the trailing gas status. , it is necessary to ensure the flow of B gas of a predetermined amount or more, so either raise the B gas pressure above the trailing gas status pressure or increase the flow rate of A gas by adjusting the flow rate control valve 8, CVH 1.
This results in a slight change in the tuyere pressure.
この変化は極めて危険で、Ａガス系遮断弁９，
AV1を全閉とした時、圧力変動要因の一つが消滅
するので、その瞬間羽口部圧力が減圧し、羽口へ
の溶湯の逆流を招き、安定した吹錬の中断を余儀
なくされることがある。 This change is extremely dangerous, and the A gas system shutoff valve 9,
When AV 1 is fully closed, one of the pressure fluctuation factors disappears, and at that moment the pressure at the tuyere decreases, causing a backflow of molten metal to the tuyere, forcing the interruption of stable blowing. There is.
本発明はかかるガス切替時の問題点を、従来の
流量制御から圧力制御にすることによつて先行ガ
ス圧力、後行ガス系の流量調節弁の開度及び後行
ガス圧力を一定条件に制御するだけでガス切替を
行なうことによつて、羽口先に圧力変動を発生さ
せることなく、従つて羽口への溶湯の逆流をみる
ことのないガス切替方法を提供しようとするもの
である。 The present invention solves this problem when switching gases by changing the conventional flow rate control to pressure control, thereby controlling the leading gas pressure, the opening degree of the trailing gas system flow rate control valve, and the trailing gas pressure to a constant condition. The present invention aims to provide a gas switching method that does not cause pressure fluctuations at the tip of the tuyere, and therefore does not cause backflow of molten metal to the tuyere, by switching the gas just by switching the gas.
すなわち、本発明の特徴とするところは、下記
のとおりである。 That is, the features of the present invention are as follows.
(1) 底吹用羽口を具備する転炉による金属製錬操
業において、先行ガスから後行ガスへの切替
を、各ガス供給源から底吹用羽口への各供給導
管に、ガス圧力計、ガス流量計、ガス流量調節
弁、遮断弁を配設し、先行ガスの羽口前圧力と
後行ガス系の流量調節弁開度を後行ステータス
の規定値にすると共に後行ガスが加圧下である
ことを確認後、後行ガス系の遮断弁を開き、次
いで先行ガス系の遮断弁を閉じ切替を完了する
ことを特徴とする転炉の底吹ガス切替方法。(1) In metal smelting operations using converters equipped with bottom-blowing tuyeres, switching from leading gas to trailing gas is performed by applying gas pressure to each supply conduit from each gas supply source to the bottom-blowing tuyeres. A gas flow meter, a gas flow rate control valve, and a shutoff valve are installed, and the pressure before the leading gas tuyere and the opening degree of the flow rate control valve of the trailing gas system are set to the specified value for the trailing status, and the trailing gas is 1. A bottom-blown gas switching method for a converter, which comprises: after confirming that the converter is under pressure, opening a trailing gas system shutoff valve, and then closing a leading gas system shutoff valve to complete the switching.
(2) 羽口前圧力が後行ステータスの規定値である
ときに、先行ガス系の遮断弁を閉じて切替を完
了することを特徴とする第１項記載の方法。(2) The method according to item 1, characterized in that when the pre-tuyere pressure is a specified value for the trailing status, the switching is completed by closing the shutoff valve of the leading gas system.
(3) 先行ガスの羽口前圧力と後行ガス系の流量調
節弁開度が、後行ステータス規定値であり、後
行ガスが加圧下でかつ後行ガス系遮断弁が開で
あることを確認後、所定時間を経て先行ガス系
遮断弁を閉じて切替を完了することを特徴とす
る第１項記載の方法。(3) The pressure before the tuyere of the leading gas and the opening degree of the flow control valve of the trailing gas system are the specified trailing status values, the trailing gas is under pressure, and the trailing gas system cutoff valve is open. 2. The method according to claim 1, wherein after confirming, the preceding gas system cutoff valve is closed after a predetermined period of time to complete the switching.
(4) 各ガスを供給源で圧力調整を可能として行う
第１項、第２項および第３項記載の方法。(4) The method described in paragraphs 1, 2, and 3, in which the pressure of each gas can be adjusted at the supply source.
本発明のガス切替方法を第２図および第３図な
らびに第４図にもとづいて説明する。 The gas switching method of the present invention will be explained based on FIGS. 2, 3, and 4.
第２図および第３図にガス切替指令発信前から
切替完了におよぶ本発明のガス切替方法を示す。 FIG. 2 and FIG. 3 show the gas switching method of the present invention from before the gas switching command is issued to when the switching is completed.
すなわち、ガス切替指令発信からT1秒までの
間にＡガス系は後行ステータス圧力に圧力調整
し、Ｂガス系の流量調節弁８′，CVH2の開度が
後行ステータスに対応する規定値となり、Ｂガス
系が加圧下であつて、かつＢガス系の遮断弁
９′，AV2が開かれ、之等の条件がすべて満足さ
れたとき、直ちにＡガス系遮断弁９，AV1を閉じ
て切替を完了する。なお必要に応じて確認条件を
設けたいときは、羽口先圧力が後行ステータスの
規定値に達していることを確認するか、更には羽
口先が安定しないとき等は、上記各作動条件の作
動を確認後、第３図に示す如く、後行ガスが供給
導管に充圧されると思われる時間T2秒を経たこ
とを確認した後、Ａガス系の遮断弁９，AV1を閉
じて切替を完了してもよい。 In other words, the pressure of the A gas system is adjusted to the trailing status pressure from the time the gas switching command is issued until T 1 second, and the opening degree of the flow rate control valve 8' and CVH 2 of the B gas system is specified to correspond to the trailing status. value, the B gas system is under pressure, and the B gas system shutoff valve 9', AV 2 is opened, and when all of these conditions are satisfied, the A gas system shutoff valve 9, AV 1 is immediately opened. Close to complete the switch. If you want to set confirmation conditions as necessary, check that the tuyere tip pressure has reached the specified value of the trailing status, or furthermore, if the tuyere tip is not stable, set the above operating conditions. After confirming that the time T 2 seconds during which the trailing gas is expected to fill the supply pipe as shown in Figure 3 has passed, close the A gas system shutoff valve 9, AV 1 . The switching may be completed.
第４図は本発明に従つたガス切替方法の実施例
のフローを示すものであるが、この図からも本発
明のガス切替方法による高い実用性が明らかとな
るであろう。 FIG. 4 shows the flow of an embodiment of the gas switching method according to the present invention, and the high practicality of the gas switching method of the present invention will become clear from this figure as well.
本発明は、既述の通り、圧力制御によるガス切
替方法であるので、羽口先がマツシユルームによ
つて閉塞した時にも、正確に圧力制御を維持する
ためには、ＡガスおよびＢガスの圧力を供給源で
調整しうる方法を用いることが望ましい。 As mentioned above, the present invention is a gas switching method using pressure control, so even when the tuyere tip is blocked by the pine room, in order to maintain accurate pressure control, the pressure of A gas and B gas must be adjusted. It is desirable to use methods that can be adjusted at the source.
これは、前述の如く供給源圧力を一定値に固定
し、流量調節弁等の圧損を制御して各ガス圧力を
制御する方法が羽口に閉塞を生じない間は正常に
作動するが、閉塞が生じたり、閉塞に近い状態に
なつたときは、ガスの流れがなくなるので、供給
源圧力に支配され、それ以外の圧力へ、ガス圧力
を調節することが不可能になるからである。 As mentioned above, the method of fixing the source pressure to a constant value and controlling the pressure drop of the flow control valve etc. to control each gas pressure operates normally as long as the tuyere does not become clogged. This is because when a gas leak occurs or a state close to blockage occurs, the flow of gas ceases, and the gas pressure is dominated by the supply source pressure, making it impossible to adjust the gas pressure to any other pressure.
一般にこの閉塞は、完全な閉塞に至る前にジヤ
ケツトガスに10〜20％の酸素を添加して、１分足
らずで閉塞を除くことが出来るので、円滑な吹錬
を継続するためには、部分的に閉塞を除くことが
好ましい。 Generally, this blockage can be removed in less than a minute by adding 10 to 20% oxygen to the jacket gas before it becomes completely blocked, so in order to continue smooth blowing, it is necessary to partially remove the blockage. It is preferable to remove the blockage immediately.
以上述べた如く、本発明は転炉操業での底吹ガ
ス切替に際して、ガス切替時における後行ガスが
後行ステータス圧力に調整された先行ガスと一定
圧力のもとに流量の確立とは関係なく切替えられ
るので、羽口先端におけるマルシユルームの成
長、離脱現象等によつて、先行ガス流量、或は後
行ガス流量が安定し得ない場合でも羽口先の圧力
変動がなく、羽口への溶湯の逆流を許すことなし
に、ガス切替を実施しうる方法を提供し、之によ
つて底吹または上・底吹転炉の底吹ガスの切替に
よる羽口への溶湯の逆流のトラブルを全く回避し
うるので、産業界に稗益するところが極めて大で
ある。 As described above, when switching to bottom-blown gas in converter operation, the present invention provides that the trailing gas at the time of gas switching has no relation to the leading gas adjusted to the trailing status pressure and the establishment of a flow rate under a constant pressure. Even if the leading gas flow rate or trailing gas flow rate cannot be stabilized due to the growth or separation of the Marseille room at the tuyere tip, there is no pressure fluctuation at the tuyere tip, and the flow of molten metal to the tuyere is prevented. The present invention provides a method for performing gas switching without allowing backflow of molten metal, thereby completely eliminating the trouble of backflow of molten metal to the tuyere due to switching between bottom blowing or bottom blowing gas in a top/bottom blowing converter. Since it can be avoided, there is a huge benefit to industry.
第１図は従来例および本発明方法を実施する制
御装置の構成の一例を示す説明図、第２図、第３
図は本発明方法の態様を示す説明図、第４図は本
発明の制御フローを示す図である。
第１図：Ａガス……先行ガス、Ｂガス……後行
ガス、P1……Ａガス系圧力、P2……Ｂガス系圧
力、F1……Ａガス系流量、F2……Ｂガス系流
量、CVH1……Ａガス系流量調節弁、CVH2……
Ｂガス系流量調節弁、AV1……Ａガス系遮断弁、
AV2……Ｂガス系遮断弁、Ｖ１……Ａガス系流
量調節弁開度、Ｖ２……Ｂガス系流量調節弁開
度。
FIG. 1 is an explanatory diagram showing an example of the configuration of a control device implementing the conventional method and the method of the present invention, FIG.
The figure is an explanatory diagram showing an aspect of the method of the present invention, and FIG. 4 is a diagram showing the control flow of the present invention. Figure 1: A gas...leading gas, B gas...trailing gas, P1 ...A gas system pressure, P2 ...B gas system pressure, F1 ...A gas system flow rate, F2 ... B gas system flow rate, CVH 1 ...A gas system flow rate control valve, CVH 2 ...
B gas system flow control valve, AV 1 ...A gas system cutoff valve,
AV 2 ... B gas system cutoff valve, V 1 ... A gas system flow rate control valve opening degree, V 2 ... B gas system flow rate control valve opening degree.
Claims (1)
業において、先行ガスから後行ガスへの切替を、
各ガス供給源から底吹用羽口への各供給導管に、
ガス圧力計、ガス流量計、ガス流量調節弁、遮断
弁を配設し、先行ガスの羽口前圧力と後行ガス系
の流量調節弁開度を後行ステータスの規定値にす
ると共に後行ガスが加圧下であることを確認後、
後行ガス系の遮断を開き、次いで先行ガス系の遮
断弁を閉じ、切替を完了することを特徴とする転
炉の底吹ガス切替方法。 ２ 羽口前圧力が後行ステータスの規定値である
ときに、先行ガス系の遮断弁を閉じて切替を完了
することを特徴とする特許請求の範囲第１項記載
の方法。 ３ 先行ガスの羽口前圧力と後行ガス系の流量調
節弁開度が、後行ステータス規定値であり、後行
ガスが加圧下でかつ後行ガス系遮断弁が開である
ことを確認後、所定時間を経て先行ガス系遮断弁
を閉じて切替を完了することを特徴とする特許請
求の範囲第１項記載の方法。 ４ 各ガスを供給源で圧力調整を可能として行う
特許請求の範囲第１項、第２項および第３項記載
の方法。[Claims] 1. In a metal smelting operation using a converter equipped with a bottom blowing tuyere, switching from leading gas to trailing gas,
In each supply conduit from each gas source to the bottom blowing tuyeres,
A gas pressure gauge, a gas flow meter, a gas flow rate control valve, and a shutoff valve are installed, and the pressure before the leading gas tuyere and the opening degree of the flow rate control valve of the trailing gas system are set to the specified value for the trailing status, and the trailing status is set to the specified value. After confirming that the gas is under pressure,
1. A bottom-blown gas switching method for a converter, characterized by opening a trailing gas system shutoff, then closing a leading gas system shutoff valve, and completing the switching. 2. The method according to claim 1, characterized in that when the pre-tuyere pressure is a specified value for the trailing status, the switching is completed by closing the shutoff valve of the leading gas system. 3 Confirm that the pressure before the tuyere of the leading gas and the opening degree of the trailing gas system flow control valve are the specified trailing status values, that the trailing gas is under pressure, and that the trailing gas system cutoff valve is open. 2. The method according to claim 1, wherein the switching is completed by closing the preceding gas system cutoff valve after a predetermined period of time. 4. The method according to claims 1, 2, and 3, in which the pressure of each gas can be adjusted at the supply source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16513380A JPS5789417A (en) | 1980-11-22 | 1980-11-22 | Switching method of bottom blowing gas of converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16513380A JPS5789417A (en) | 1980-11-22 | 1980-11-22 | Switching method of bottom blowing gas of converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5789417A JPS5789417A (en) | 1982-06-03 |
| JPS6151608B2 true JPS6151608B2 (en) | 1986-11-10 |
Family
ID=15806521
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16513380A Granted JPS5789417A (en) | 1980-11-22 | 1980-11-22 | Switching method of bottom blowing gas of converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5789417A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0288710A (en) * | 1988-09-22 | 1990-03-28 | Kawasaki Steel Corp | Method for changing over process gas in metallurgical furnace |
-
1980
- 1980-11-22 JP JP16513380A patent/JPS5789417A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5789417A (en) | 1982-06-03 |
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