JPH06184615A - Method for controlling flow rate of blowing gas in refining furnace - Google Patents
Method for controlling flow rate of blowing gas in refining furnaceInfo
- Publication number
- JPH06184615A JPH06184615A JP43A JP34023992A JPH06184615A JP H06184615 A JPH06184615 A JP H06184615A JP 43 A JP43 A JP 43A JP 34023992 A JP34023992 A JP 34023992A JP H06184615 A JPH06184615 A JP H06184615A
- Authority
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- Japan
- Prior art keywords
- flow rate
- gas
- blowing
- oxygen
- control valve
- 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.)
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- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、精錬炉の吹込みガス流
量制御方法に係り、特に上吹き転炉、底吹き転炉、上底
吹き転炉、ＡＯＤ転炉等の精錬炉に上吹きランスまたは
底吹き羽口を介してガスを吹込むのに好適な精錬炉の吹
込みガス流量制御方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a blowing gas flow rate in a refining furnace, and more particularly to a top refining furnace such as a top blowing converter, a bottom blowing converter, a top bottom blowing converter and an AOD converter. The present invention relates to a blowing gas flow rate control method suitable for blowing gas through a lance or a bottom blowing tuyere.
【０００２】[0002]
【従来の技術】一般に、転炉等の精錬炉に上吹きランス
または底吹き羽口を介して精錬用吹込みガスを吹込んで
精錬する場合の調節弁によるガス吹込み流量制御では、
プロセス調節計を用いた単なるＰＩＤ制御あるいは規定
開度制御が知られている。規定開度制御には、例えば特
公昭61−51606 号公報のように、転炉操業における底吹
羽口への吹込みガス切替等におけるガス供給の制御を流
量調節弁の開度制御により行うにあたり、各操業ステー
タスに応じた羽口圧損ΔＰy0を転炉数毎に予め計算して
おき、その都度のガス元圧Ｐ2 から羽口圧損Ｐy0を減算
し、流量調節弁圧損ΔＰ4 を得、これから流量調節弁の
Ｃν値（弁流量係数）を求め、流量調節弁の開度を前記
Ｃν値に基づく規定開度とする転炉の底吹きガス吹込み
制御方法が提案されている。2. Description of the Related Art Generally, in the case of refining by injecting a refining blowing gas into a refining furnace such as a converter through a top blowing lance or a bottom blowing tuyere, in controlling a gas blowing flow rate by a control valve,
A simple PID control or a specified opening control using a process controller is known. For example, as disclosed in Japanese Examined Patent Publication No. 61-51606, the regulated opening degree control is performed by controlling the opening degree of the flow rate control valve to control the gas supply when switching the blowing gas to the bottom blower mouth in the converter operation. , The tuyere pressure loss ΔPy 0 corresponding to each operation status is calculated in advance for each number of converters, and the tuyere pressure loss Py 0 is subtracted from the gas source pressure P 2 at each time to obtain the flow control valve pressure loss ΔP 4 . A bottom blowing gas injection control method for a converter has been proposed in which the Cν value (valve flow rate coefficient) of the flow rate control valve is obtained from this and the opening degree of the flow rate control valve is set to a specified opening degree based on the Cν value.
【０００３】また特開昭61−284514号、特開昭61−2845
15号公報のように、測定ガス流量を調節弁にフィードバ
ックして、設定流量になるようにガス流量を制御する定
流量制御によって、羽口から精錬炉内に吹込まれるガス
流量を制御する精錬炉の吹込みガス流量制御方法におい
て、ガスの吹込み流量値をステップ的に大幅に変更、も
しくはガス種類を変更する際にガス流量を増加させると
きには、まず流量調節弁の開度を大きくするなどして、
流量設定値を変更後の流量設定値より高い過大流量設定
値に切替えて定流量制御し、ガス流量を減少させるとき
にはまず流量調節弁の開度を小さくするなどして流量設
定値を変更後の流量設定値より低い過小流量設定値に切
替えて定流量制御し、次いで、羽口背圧が流量圧力特性
曲線に基づき変更後の流量設定値に関連させて定めた圧
力設定値に達した時に、前記過大流量設定値から前記変
更後の流量設定値へと切替えて定流量制御する精錬炉の
吹込みガス流量制御方法が開示されている。Further, JP-A-61-284514 and JP-A-61-2845.
As in Japanese Patent Publication No. 15, the refining for controlling the flow rate of gas blown from the tuyere into the refining furnace by the constant flow rate control for feeding back the measured gas flow rate to the control valve and controlling the gas flow rate to be the set flow rate. In the method of controlling the flow rate of gas blown into the furnace, when the value of the flow rate of gas blown is changed in large steps, or when the gas flow rate is increased when changing the gas type, first increase the opening of the flow rate control valve, etc. do it,
When changing the flow rate setting value to an excessive flow rate setting value that is higher than the changed flow rate setting value for constant flow rate control, and when reducing the gas flow rate, first decrease the opening of the flow rate control valve, etc. to change the flow rate setting value. Switching to an underflow rate that is lower than the flow rate setting value for constant flow rate control, and then when the tuyere back pressure reaches the pressure setting value that is set in relation to the changed flow rate setting value based on the flow rate pressure characteristic curve, A blowing gas flow rate control method for a refining furnace is disclosed, in which a constant flow rate control is performed by switching from the excessive flow rate set value to the changed flow rate set value.
【０００４】[0004]
【発明が解決しようとする課題】前記従来技術のうち、
単なるＰＩＤ制御であると定常時の安定性を確保すれ
ば、ゲインを下げているため、目標の設定値に到達する
まで時間がかかる。又、逆に過渡応答性を確保すれば定
常時の安定性が保たれず、特に大きな外乱が入ると収束
しないこともあるという問題があった。Of the above-mentioned conventional techniques,
If the stability in the steady state is ensured by the mere PID control, the gain is lowered, and therefore it takes time to reach the target set value. On the contrary, if the transient response is secured, the stability in the steady state cannot be maintained, and there is a problem that it may not converge especially when a large disturbance is introduced.
【０００５】また、規定開度制御では過渡応答性は向上
するが急激な吹込みガスの変動を生じて精錬炉内の圧力
変動を招き、特に吹込みガスの急激な減少は炉内圧力を
負圧にするため、炉内への大量の空気混入を生じて未燃
焼酸素の発生や発生COの減少、CO2 の増加を伴うという
問題があった。本発明は前記従来技術の問題点を解消す
るべくなされたもので、ガス吹込み流量を設定した吹込
みパターンに基づいて制御する際に、ガス吹込み流量を
ステップ的に大幅に変更するか、または元のパターンに
大幅に戻す際に、過渡応答性を改善すると共に定常操業
時の安定性が保たれ、急激な炉内圧力の変動を防止する
ことができる精錬炉の吹込みガス流量制御方法を提供す
ることを目的とするものである。Further, although the transient response is improved by the regulated opening degree control, a sudden change in the blown gas causes a pressure change in the refining furnace, and a rapid decrease in the blown gas causes a negative pressure in the furnace. Since the pressure is increased, a large amount of air is mixed into the furnace, which causes problems such as generation of unburned oxygen, reduction of generated CO, and increase of CO 2 . The present invention has been made to solve the above-mentioned problems of the prior art. When controlling the gas injection flow rate based on a set injection pattern, the gas injection flow rate is changed in a stepwise manner, or Or a method for controlling the blowing gas flow rate of a refining furnace that can improve transient response and maintain stability during steady operation and prevent sudden fluctuations in furnace pressure when returning to the original pattern significantly It is intended to provide.
【０００６】[0006]
【課題を解決するための手段】前記目的を達成するため
の本発明は、測定ガス流量を調節弁にフィードバックし
て設定流量となるようにガス流量を制御する定流量制御
によって、ランスまたは羽口から精錬炉内に吹込まれる
ガス流量を制御する精錬炉の吹込みガス流量制御方法に
おいて、ガスの吹込み流量を吹込みパターンに基づいて
制御している時にサブランスによる計測、スロッピング
発生などの操業要因によってガスの吹込み流量をステッ
プ的に大幅に変更して増加もしくは減少する際に、流量
変更の目的に応じて変更後の吹込みガス流量に到達する
までの時間を予め定めておき、一定の流量変化で変更後
の吹込みガス流量に到達するように、調節弁開度をガス
吹込み流量に見合った開度になるように流量・圧力・弁
開度から成る調節弁特性を操業実績から学習して求めた
開度に基づいて規定開度制御することを特徴とする精錬
炉の吹込みガス流量制御方法である。SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a lance or tuyere by constant flow rate control in which the measured gas flow rate is fed back to a control valve to control the gas flow rate to a set flow rate. In the blowing gas flow rate control method of the refining furnace that controls the gas flow rate blown into the refining furnace from the sub-lance, when measuring the gas flow rate based on the blowing pattern, the sloping, etc. Depending on the purpose of flow rate change, when the flow rate of gas is greatly changed in a stepwise manner to increase or decrease due to operating factors, the time until reaching the changed blown gas flow rate is set in advance, Adjusting the control valve opening from the flow rate, pressure, and valve opening to reach the changed blown gas flow rate with a constant change in flow rate A blow gas flow rate control method of the refining furnace, characterized in that defining the opening control based on the opening degree calculated by learning the characteristics from the operational results.
【０００７】[0007]
【実施例】以下、本発明の構成を作用と共に実施例に基
づいて説明する。図１に示すようにプロセスコンピュー
タ（Ｐ／Ｃ）18の下には計装制御システム（ＤＣＳ）17
を配置してあり、プロセスコンピュータ18からの操業指
令に基づき計装制御システム17を用いて、まず酸素ホル
ダ１から供給される吹錬用酸素ガスの圧力は１次減圧調
節弁２によって制御され、１次減圧後の酸素圧力は圧力
計３によって測定される。EXAMPLES The structure of the present invention will be described below with reference to the working examples. As shown in FIG. 1, an instrumentation control system (DCS) 17 is provided under the process computer (P / C) 18.
Is arranged, and using the instrumentation control system 17 based on the operation command from the process computer 18, first, the pressure of the blowing oxygen gas supplied from the oxygen holder 1 is controlled by the primary pressure reducing control valve 2. The oxygen pressure after the primary depressurization is measured by the pressure gauge 3.
【０００８】１号転炉16への吹錬酸素流量は１号炉吹錬
酸素ライン４に設けた酸素流量計８によって測定される
が、同ライン４上に設けた酸素１次圧力計５および酸素
温度計６によって、それぞれ測定された圧力および温度
によって圧力・温度補正を行って酸素流量調節弁９を調
節して設定流量になるように制御される。この場合、１
号炉吹錬酸素ライン４上に設けられた主管酸素弁７は開
となっている他、東ランス14および西ランス15のうち、
今回の吹錬に使用する転炉16内に挿入された東ランス14
を介して酸素ガスが炉内に吹込まれるので東ランス末端
弁12が開となっており、西ランス末端弁11は閉としてあ
る。なお、東ランス14から１号転炉16内に吹込まれる酸
素ガスの背圧が酸素背圧計10によって測定される。また
東ランス14の上部にはランス振動計13が取り付けてあ
り、ランス振動計13によって吹錬過程における東ランス
14の振動を測定し、これによって造滓状況をキャッチす
るようになっている。図１において４' は他炉への吹錬
酸素ラインを示す。なお、図面では上吹きランスに酸素
ガスを供給する場合について示したが、本発明は底吹き
羽口へ酸素ガスを供給する場合にも適用可能である。The flow rate of blowing oxygen to the No. 1 converter 16 is measured by an oxygen flow meter 8 provided in the No. 1 blowing oxygen line 4, and an oxygen primary pressure gauge 5 and an oxygen primary pressure gauge 5 provided on the line 4 are used. The oxygen thermometer 6 performs pressure / temperature correction according to the measured pressure and temperature, respectively, and adjusts the oxygen flow rate control valve 9 so that the set flow rate is achieved. In this case, 1
The main pipe oxygen valve 7 provided on the No. 1 blowing oxygen line 4 is open, and among the East Lance 14 and West Lance 15,
East Lance 14 inserted in the converter 16 used for this blowing
Since the oxygen gas is blown into the furnace through the east lance end valve 12, the west lance end valve 11 is closed. The back pressure of the oxygen gas blown from the East Lance 14 into the No. 1 converter 16 is measured by the oxygen back pressure gauge 10. A lance vibrometer 13 is attached to the upper part of the east lance 14, and the lance vibrometer 13 allows the east lance to be used during the blowing process.
The vibration of 14 is measured, and it is designed to catch the slag situation. In FIG. 1, 4'denotes a blown oxygen line to another furnace. Although the drawing shows the case where oxygen gas is supplied to the top blowing lance, the present invention is also applicable to the case where oxygen gas is supplied to the bottom blowing tuyere.
【０００９】前記酸素流量調節弁９のＣν値（弁流量係
数）は一般的には下記の式で求められる。ΔＰ＞Ｐ1 ／
２のときThe Cν value (valve flow rate coefficient) of the oxygen flow rate control valve 9 is generally obtained by the following equation. ΔP> P 1 /
When 2
【００１０】[0010]
【数１】 [Equation 1]
【００１１】ΔＰ＜Ｐ1 ／２のときWhen ΔP <P 1/2
【００１２】[0012]
【数２】 [Equation 2]
【００１３】ここで、 Ｑ ：ガス流量（ランスからの目標ガス吐出流量） Ｇ ：ガス比重 Ｐ1 ：流量調節弁前の一次圧力（元圧） Ｐ2 ：流量調節弁後圧力（背圧） ΔＰ：Ｐ1 −Ｐ2 ｔ ：ガス温度 ところで酸素流量調節弁９後の圧力は調節弁９以降の条
件にかかわってくる。つまり図１の場合、東ランス14と
西ランス15とでは酸素ラインの長さ等の条件が違ってい
るので圧損に差を生じるからである。なお、前述のよう
に酸素流量調節弁９によって調節した後の酸素ガス圧力
は、前記Ｃν値（弁流量係数）よりΔＰ＞Ｐ1 ／２のと
きは、式（１）より吹込みガスの元圧Ｐ1 と吹込みガス
流量Ｑとにより決まり、ΔＰ＜Ｐ1 ／２のときにも大ま
かには吹込みガスの元圧Ｐ1 と吹込みガス流量Ｑで決ま
ると考えて差し支えない。Here, Q: gas flow rate (target gas discharge flow rate from lance) G: specific gravity of gas P 1 : primary pressure before flow control valve (source pressure) P 2 : pressure after flow control valve (back pressure) ΔP : P 1 -P 2 t: Gas temperature By the way, the pressure after the oxygen flow rate control valve 9 is related to the conditions after the control valve 9. That is, in the case of FIG. 1, the conditions such as the length of the oxygen line are different between the east lance 14 and the west lance 15, so that the pressure loss is different. Note that the oxygen gas pressure after being adjusted by the oxygen flow rate adjusting valve 9 as described above, when ΔP> P 1/2 from the Cν value (valve flow rate coefficient), is the source of the blown gas from the equation (1). determined by the pressure P 1 and the blowing gas flow rate Q, no problem consider the roughly even when [Delta] P <the P 1/2 determined by the base pressure P 1 and the blowing gas flow rate Q of the blow gas.
【００１４】したがって、図２に示すように上吹きラン
ス毎に吹込みガスの元圧と酸素流量およびそのときの調
節弁開度を実操業から常に学習して作成しておくことに
より、ガス吹込み流量に変更があった場合、図２に示す
関係から変更後の吹込みガス流量に制御することができ
る。図３は転炉吹錬中の酸素吹込みパターンに応じてサ
ブランス測定する段階での酸素流量調節弁の開度、酸素
流量および酸素元圧の推移を吹錬に使用した吹錬酸素％
による経時変化を示している。サブランスによる溶鋼の
温度および炭素濃度の測定は、吹止め酸素流量から遡っ
て何Nm3 前からであると設定されているので、吹錬酸素
％がサブランス測定酸素流量に達する前の予め定めた流
量介入時点の吹錬酸素％に到達すると、図３に示すよう
にそれまでのガス吹込み流量設定のための調節弁開度45
°、酸素流量600Nm3／min 、元圧14kg／cm2 Ｇからサブ
ランス測定開始時点における酸素流量350Nm3／min に至
るまでの過程で一定の酸素流量変化で到達するように流
量調節弁の開度を酸素吹込み流量に見合った開度になる
ように、予め定めておいた流量・圧力・弁開度からなる
調節弁特性を操業実績から学習して求めた開度に基づい
て規定開度制御する。Therefore, as shown in FIG. 2, the original pressure of the blown gas, the oxygen flow rate, and the control valve opening at that time are constantly learned from the actual operation and created for each upper blowing lance, so that the gas blowing is performed. When the injection flow rate is changed, the injection gas flow rate after the change can be controlled from the relationship shown in FIG. Figure 3 shows the changes in the oxygen flow rate control valve opening, oxygen flow rate, and oxygen source pressure during the sublance measurement according to the oxygen blowing pattern during converter blowing.
Shows the change with time due to. Since the temperature and carbon concentration of molten steel with the sublance are set to be Nm 3 before the blowing oxygen flow rate, the predetermined flow rate before the blown oxygen% reaches the sublance measurement oxygen flow rate. When the blown oxygen% at the time of intervention is reached, as shown in Fig. 3, the control valve opening 45 for setting the gas injection flow rate until then 45
°, oxygen flow rate of 600Nm 3 / min, source pressure of 14kg / cm 2 G to the oxygen flow rate of 350Nm 3 / min at the start of sublance measurement. So that the opening corresponds to the oxygen injection flow rate, the specified opening control is performed based on the opening obtained by learning the control valve characteristics consisting of the predetermined flow rate, pressure, and valve opening from the operation results. To do.
【００１５】到達する過程で元圧が14kg／cm2 Ｇから図
３に示すように変動すると、調節弁開度を前記図２に示
す調節弁特性に基づいて元圧変動分追従して開度制御を
行い、介入酸素量を供給してサブランス測定開始時には
所定の酸素流量350Nm3／minとしてサブランスによる溶
鋼の温度測定および炭素濃度の測定を行う。サブランス
測定が終了したら同様にして規定開度制御により元のパ
ターンに戻す。When the source pressure fluctuates from 14 kg / cm 2 G as shown in FIG. 3 in the process of reaching, the control valve opening follows the variation of the source pressure based on the control valve characteristic shown in FIG. When the sub-lance measurement is started by supplying the intervention oxygen amount, the temperature of molten steel and the carbon concentration are measured by the sub-lance at a predetermined oxygen flow rate of 350 Nm 3 / min. When the sublance measurement is completed, the pattern is returned to the original pattern by the specified opening control in the same manner.
【００１６】前記の過程を図４を用いて時系列的に再説
明すると、図４（ａ）に示すように設定された吹込みパ
ターンによる酸素流量により吹錬中に使用した酸素％が
サブランス測定開始時前の介入酸素量時点に到達したら
サブランスパラメータを加味して図４（ｂ）に示すよう
にサブランス測定段階の酸素流量パターンを設定する。The above process will be described again in time series with reference to FIG. 4. The oxygen percentage used during the blowing is measured by the sublance measurement by the oxygen flow rate according to the blowing pattern set as shown in FIG. 4 (a). When the intervention oxygen amount time point before the start is reached, the oxygen flow rate pattern at the sublance measurement stage is set as shown in FIG.
【００１７】次にこの設定した酸素流量パターンに対応
させて図４（ｃ）に示すように調節弁の開度変更パター
ンを作成し、この開度変更パターンに従って酸素調節弁
の開度を制御する。なお途中で元圧が変動したら図２に
示す元圧、酸素流量および調節弁開度との関係を用いて
元圧補正を加えて図４（ｄ）に示す調節弁開度パターン
によりサブランス測定段階を経過させる。Next, as shown in FIG. 4 (c), an opening change pattern of the control valve is created corresponding to the set oxygen flow rate pattern, and the opening of the oxygen control valve is controlled according to this opening change pattern. . If the source pressure fluctuates during the process, the source pressure is corrected using the relationship between the source pressure, the oxygen flow rate, and the control valve opening shown in FIG. 2, and the sublance measurement step is performed according to the control valve opening pattern shown in FIG. 4D. To pass.
【００１８】図５は本発明の方法を実施するためのフロ
ーチャートを示しており、上吹きランスからの酸素吹込
み開始による転炉吹錬のスタートから吹錬終了までの吹
錬過程において、サブランス測定のタイミングを決定す
るかまたはスロッピング発生の有無を判定する。サブラ
ンス測定またはスロッピング発生の場合には、それぞれ
定常吹錬パターンからの酸素流量パラメータの設定変更
を行い、この酸素流量設定変更に対応して調節弁開度変
更パターンを作成する。この調節弁開度パターンによる
酸素流量変化が規定値100Nm3／min 以上であるかどうか
を判定し、100Nm3／min 以上である場合には元圧補正を
行った後、規定開度出力によりサブランス測定またはス
ロッピングが解消するまで規定開度制御を行う。FIG. 5 shows a flow chart for carrying out the method of the present invention. In the blowing process from the start of converter blowing by the start of oxygen blowing from the upper blowing lance to the end of blowing, sublance measurement is performed. Or the presence or absence of sloping is determined. In the case of sublance measurement or sloping occurrence, the setting of the oxygen flow rate parameter is changed from the steady blowing pattern, and the control valve opening change pattern is created corresponding to the change of the oxygen flow rate setting. After oxygen flow rate changes due to the adjustment valve opening pattern is determined whether a specified value 100 Nm 3 / min or more, when it is 100 Nm 3 / min or more is subjected to the source pressure correction, sub-lance pursuant opening Output The specified opening control is performed until measurement or sloping is resolved.
【００１９】図６（ｂ）は本発明の１実施例を示すもの
である。吹錬開始から終了までの過程においてスロッピ
ング時、サブランス測定時に、変更後の吹込みガス流量
設定に到達するまで順次変更する吹込み流量になるよう
に、予め操業から得た調節弁開度に規定開度制御するの
で、設定通りの流量変化で流量制御できるという良好な
結果が得られた。なお図６（ａ）は、比較のため従来の
ＰＩＤ制御オンリーの操業実績を表しており、この場
合、ＰＩＤ制御オンリーであるため設定からかけ離れた
流量変化を示していることがわかる。FIG. 6B shows an embodiment of the present invention. At the time of sloping and sublance measurement during the process from the start to the end of blowing, the control valve opening obtained from the operation in advance should be adjusted so that the blow flow rate is changed sequentially until the changed blow gas flow rate setting is reached. Since the opening degree is controlled, the good result that the flow rate can be controlled with the flow rate change as set is obtained. Note that FIG. 6A shows the operation results of the conventional PID control only for comparison, and in this case, it can be seen that the flow rate change far from the setting is shown because it is PID control only.
【００２０】[0020]
【発明の効果】以上説明したように本発明によれば、転
炉等の精錬炉に吹込むガスの流量を大幅に変更するかま
たは元のパターンに大幅に戻す際に、ガス吹込み流量変
更の目的に応じて変更後の吹込みガス流量設定値に到達
するまでの時間を予め定めておき、該到達時間内に一定
の流量変化で到達するように制御する。それと共に吹込
み流量、吹込みガスの元圧、調節弁開度からなる特性を
操業から学習しておき、ガス吹込み流量設定値に見合う
調節弁開度を該特性から求めて規定開度制御するため、
設定通りの流量変化で精錬炉のガス流量制御を行うこと
ができる。As described above, according to the present invention, when the flow rate of gas blown into a refining furnace such as a converter is largely changed or when the gas is returned to the original pattern, the flow rate of gas is changed. Depending on the purpose of (1), the time required to reach the changed blown gas flow rate set value is set in advance, and the flow rate is controlled to reach a constant flow rate change within the reaching time. At the same time, the characteristics consisting of the blowing flow rate, the source pressure of the blowing gas, and the control valve opening degree are learned from the operation, and the control valve opening degree that matches the gas blowing flow rate set value is obtained from the characteristics to control the specified opening degree. In order to
The gas flow rate of the refining furnace can be controlled by changing the flow rate as set.
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明が採用された転炉ランスへの上吹き酸素
ガス制御装置の全体構成を示す説明図である。FIG. 1 is an explanatory diagram showing the overall configuration of a top blowing oxygen gas control device for a converter lance to which the present invention is applied.
【図２】流量調節弁開度、酸素流量および元圧の関係を
示す線図である。FIG. 2 is a diagram showing a relationship among a flow control valve opening, an oxygen flow rate, and a source pressure.
【図３】調節弁開度および酸素流量の推移を吹錬酸素％
を尺度として示す線図である。[Fig. 3] Changes in the control valve opening and the oxygen flow rate as blown oxygen%
It is a diagram showing as a scale.
【図４】本発明のパターン変更手順を示す説明図であ
る。FIG. 4 is an explanatory diagram showing a pattern changing procedure of the present invention.
【図５】本発明を実施するためのロジッタを示すフロー
チャートである。FIG. 5 is a flow chart showing a Rojita for implementing the present invention.
【図６】本発明例と従来例の酸素流量の推移を吹錬酸素
％を尺度として示す線図である。FIG. 6 is a diagram showing changes in the oxygen flow rates of the present invention example and the conventional example with blowing oxygen% as a scale.
１ 酸素ホルダ ２ １次減圧調節弁 ３ １次減圧後酸素圧力計 ４ １号炉吹錬酸素ライン ５ 酸素１次圧力計 ６ 酸素温度計 ７ 主管酸素弁 ８ 酸素流量計 ９ 酸素流量調節弁 10 酸素背圧計 11 西ランス末端弁 12 東ランス末端弁 13 ランス振動計 14 東ランス 15 西ランス 16 １号転炉 17 計装制御システム（ＤＣＳ） 18 プロセスコンピュータ（Ｐ／Ｃ） 1 Oxygen holder 2 Primary decompression control valve 3 Oxygen pressure gauge after primary decompression 4 No. 1 furnace blowing oxygen line 5 Oxygen primary pressure gauge 6 Oxygen thermometer 7 Main pipe oxygen valve 8 Oxygen flow meter 9 Oxygen flow control valve 10 Oxygen Back pressure gauge 11 West lance end valve 12 East lance end valve 13 Lance vibrometer 14 East lance 15 West lance 16 No. 1 converter 17 Instrumentation control system (DCS) 18 Process computer (P / C)
Claims (1)
して設定流量となるようにガス流量を制御する定流量制
御によって、ランスまたは羽口から精錬炉内に吹込まれ
るガス流量を制御する精錬炉の吹込みガス流量制御方法
において、ガスの吹込み流量を吹込みパターンに基づい
て制御している時にサブランスによる計測、スロッピン
グ発生などの操業要因によって、ガスの吹込み流量をス
テップ的に大幅に変更して増加もしくは減少する際に、
流量変更の目的に応じて変更後の吹込みガス流量に到達
するまでの時間を予め定めておき、一定の流量変化で変
更後の吹込みガス流量に到達するように、調節弁開度を
ガス吹込み流量に見合った開度になるように流量・圧力
・弁開度から成る調節弁特性を操業実績から学習して求
めた開度に基づいて規定開度制御することを特徴とする
精錬炉の吹込みガス流量制御方法。1. A refining furnace that controls the flow rate of gas blown into a refining furnace from a lance or tuyere by constant flow rate control that feeds back the measured gas flow rate to a control valve to control the gas flow rate to a set flow rate. In the blowing gas flow rate control method, the gas blowing flow rate is greatly increased stepwise due to operational factors such as measurement by sublance and sloping while controlling the gas blowing flow rate based on the blowing pattern. When changing and increasing or decreasing,
Depending on the purpose of the flow rate change, the time until reaching the changed blown gas flow rate is set in advance, and the control valve opening is set to the gas so that the changed blown gas flow rate is reached at a fixed flow rate change. A smelting furnace characterized by controlling the specified opening based on the opening obtained by learning the control valve characteristics consisting of flow, pressure, and valve opening from the operation results so that the opening corresponds to the blowing flow rate. Blow gas flow rate control method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34023992A JP3425698B2 (en) | 1992-12-21 | 1992-12-21 | Method of controlling the flow rate of blown gas in refining furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34023992A JP3425698B2 (en) | 1992-12-21 | 1992-12-21 | Method of controlling the flow rate of blown gas in refining furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06184615A true JPH06184615A (en) | 1994-07-05 |
| JP3425698B2 JP3425698B2 (en) | 2003-07-14 |
Family
ID=18335037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34023992A Expired - Fee Related JP3425698B2 (en) | 1992-12-21 | 1992-12-21 | Method of controlling the flow rate of blown gas in refining furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3425698B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101956041A (en) * | 2010-09-28 | 2011-01-26 | 莱芜钢铁集团有限公司 | Converter oxygen-blowing control method and device |
| JP2012187601A (en) * | 2011-03-09 | 2012-10-04 | Jfe Steel Corp | Method for controlling secondary cooling water of continuous casting machine |
| KR101321853B1 (en) * | 2011-08-05 | 2013-10-22 | 주식회사 포스코 | Treatment apparatus for molten metal and the method thereof |
| CN110542308A (en) * | 2019-08-19 | 2019-12-06 | 广东新生环保科技股份有限公司 | Refining smelting furnace DCS control system |
| CN114671438A (en) * | 2022-03-31 | 2022-06-28 | 新疆西部合盛硅业有限公司 | Method for automatically controlling oxygen blowing refining by interlocking weight and temperature |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61284515A (en) * | 1985-06-10 | 1986-12-15 | Kawasaki Steel Corp | Method for controlling flow rate of gas to be blown to refining furnace |
| JPS61284514A (en) * | 1985-06-10 | 1986-12-15 | Kawasaki Steel Corp | Method for controlling flow rate of gas to be blown to refining furnace |
| JPH05239524A (en) * | 1992-02-28 | 1993-09-17 | Sumitomo Metal Ind Ltd | Method for controlling blowing of converter |
-
1992
- 1992-12-21 JP JP34023992A patent/JP3425698B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61284515A (en) * | 1985-06-10 | 1986-12-15 | Kawasaki Steel Corp | Method for controlling flow rate of gas to be blown to refining furnace |
| JPS61284514A (en) * | 1985-06-10 | 1986-12-15 | Kawasaki Steel Corp | Method for controlling flow rate of gas to be blown to refining furnace |
| JPH05239524A (en) * | 1992-02-28 | 1993-09-17 | Sumitomo Metal Ind Ltd | Method for controlling blowing of converter |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101956041A (en) * | 2010-09-28 | 2011-01-26 | 莱芜钢铁集团有限公司 | Converter oxygen-blowing control method and device |
| JP2012187601A (en) * | 2011-03-09 | 2012-10-04 | Jfe Steel Corp | Method for controlling secondary cooling water of continuous casting machine |
| KR101321853B1 (en) * | 2011-08-05 | 2013-10-22 | 주식회사 포스코 | Treatment apparatus for molten metal and the method thereof |
| CN110542308A (en) * | 2019-08-19 | 2019-12-06 | 广东新生环保科技股份有限公司 | Refining smelting furnace DCS control system |
| CN114671438A (en) * | 2022-03-31 | 2022-06-28 | 新疆西部合盛硅业有限公司 | Method for automatically controlling oxygen blowing refining by interlocking weight and temperature |
| CN114671438B (en) * | 2022-03-31 | 2023-05-09 | 新疆西部合盛硅业有限公司 | Weight and temperature interlocking automatic control oxygen blowing refining method |
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| Publication number | Publication date |
|---|---|
| JP3425698B2 (en) | 2003-07-14 |
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