JPH0411604B2 - - Google Patents
Info
- Publication number
- JPH0411604B2 JPH0411604B2 JP60012567A JP1256785A JPH0411604B2 JP H0411604 B2 JPH0411604 B2 JP H0411604B2 JP 60012567 A JP60012567 A JP 60012567A JP 1256785 A JP1256785 A JP 1256785A JP H0411604 B2 JPH0411604 B2 JP H0411604B2
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- furnace pressure
- pressure
- control
- waste gas
- 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 - Lifetime
Links
- 238000000034 method Methods 0.000 claims description 27
- 239000002912 waste gas Substances 0.000 claims description 16
- 238000001514 detection method Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 11
- 238000007664 blowing Methods 0.000 description 8
- 239000000428 dust Substances 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 229910000805 Pig iron Inorganic materials 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000001687 destabilization Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000002123 temporal effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000234435 Lilium Species 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000012850 discrimination method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000003313 weakening effect 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
- C21C5/38—Removal of waste gases or dust
- C21C5/40—Offtakes or separating apparatus for converter 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)
- Testing And Monitoring For Control Systems (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、炉内圧（炉圧）検出手段と、該検出
された炉圧を所定の設定値と比較しその偏差に応
じた制御信号を出力する炉圧調節手段と、該調節
手段からの制御信号に基づいて炉内から発生する
廃ガスの流量を制御する流量制御手段とから成
り、炉口とスカートとの間を密閉またはこれと略
同等の状態にし、前記炉圧を所定値となるように
制御する密閉形転炉廃ガス処理装置における炉圧
制御方法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention comprises a furnace internal pressure (furnace pressure) detection means, and a control signal that compares the detected furnace pressure with a predetermined set value and outputs a control signal according to the deviation. It consists of a furnace pressure regulating means for outputting an output, and a flow rate controlling means for controlling the flow rate of waste gas generated from the furnace based on a control signal from the regulating means, and the space between the furnace mouth and the skirt is sealed or shortened to this. The present invention relates to a furnace pressure control method in a closed converter waste gas treatment apparatus, which controls the furnace pressure to a predetermined value under the same condition.
従来の転炉廃ガス処理装置においては、炉口部
の上部に位置するスカートを炉口部に密着させ
ず、適当な間隔を開けて操業を行なつている。廃
ガス回収は炉口部の圧力Poを検出し、この圧力
Poが大気圧Paに等しくなるように、フイードバ
ツク制御にてダンパを操作することにより行なわ
れる。この時、炉口とスカート間の間隔が広いと
炉圧変動時に多量のガス量の流入、流出を招き、
回収率が低下する。逆に、炉口とスカート間の間
隔が狭いとプロセス・ゲインが高くなり、炉圧制
御ループがハンチングを起して操業を続けること
が困難となる。
In conventional converter waste gas treatment equipment, the skirt located above the furnace mouth is not brought into close contact with the furnace mouth, but is operated with an appropriate gap between the skirts. For waste gas recovery, the pressure Po at the furnace mouth is detected, and this pressure
This is done by operating a damper under feedback control so that Po becomes equal to atmospheric pressure Pa. At this time, if the gap between the furnace mouth and the skirt is wide, a large amount of gas will flow in and out when the furnace pressure fluctuates.
Recovery rate decreases. On the other hand, if the gap between the furnace mouth and the skirt is narrow, the process gain will be high, causing hunting in the furnace pressure control loop and making it difficult to continue operation.
本発明者等はこの解決策として、炉圧制御系が
不安定状態（ハンチング状態）であるか否かを判
別し、不安定時には、調節系の制御パラメータを
現在のものより一段弱いものに変更する方法を提
案している。なお、制御系の不安定状態を判別す
る判別方式については、特開昭58−168106号公報
として公開されているが、こゝで、その概要につ
いて説明する。 As a solution to this problem, the inventors determined whether or not the reactor pressure control system was in an unstable state (hunting state), and when it was unstable, changed the control parameters of the adjustment system to ones that were one step weaker than the current ones. We are proposing a method to do so. Note that a determination method for determining an unstable state of a control system is disclosed in Japanese Patent Application Laid-Open No. 168106/1983, and an outline thereof will be explained here.
第３図イは、プロセス変数Ｘの時間的変化の一
例を示したグラフであり、第３図ロは同じ時間に
おける操作変数Ｙの時間的変化の一例を示したグ
ラフである。 FIG. 3A is a graph showing an example of a temporal change in the process variable X, and FIG. 3B is a graph showing an example of a temporal change in the manipulated variable Y at the same time.
第３図イにおける３個の極点（山または谷の頂
点）の値X1，X2，X3と発生時刻tX1，tX2，tX3が
求まり、また第３図ロにおける同様な３個の極点
の値Y1，Y2，Y3と発生時刻tY1，tY2，tY3が求ま
つたものとする。 The values X 1 , X 2 , X 3 and the times of occurrence t X1 , t X2 , t Assume that the values of the extreme points Y 1 , Y 2 , Y 3 and the times of occurrence t Y1 , t Y2 , t Y3 have been found.
このとき、Ｘの波形の周期（tX3−tX1）とＹの
波形の周期（tY3−tY1）を比較し、両者の比が或
る許容範囲s1の範囲内で１に近いか否かを判定す
る。すなわち次の式を満足するか否かを判定す
る。 At this time, compare the period of the X waveform ( t Determine whether or not. That is, it is determined whether the following equation is satisfied.
｜（tX3−tX1）／（tY3−tY1）−１｜s1
さらに、波形Ｘの振幅の減衰率が或る所定の減
衰率αより大であるかどうかを判定する。すなわ
ち次の式を満足するか否かを判定する。 | ( t _ _ That is, it is determined whether the following equation is satisfied.
｜X3−X2｜＞α・｜X2−X1｜
同様に、波形Ｙの振幅の減衰率が或る所定の減
衰率αより大であるかどうかを判定する。すなわ
ち次の式を満足するか否かを判定する。 |X 3 −X 2 |>α・|X 2 −X 1 | Similarly, it is determined whether the attenuation rate of the amplitude of the waveform Y is larger than a certain predetermined attenuation rate α. That is, it is determined whether the following equation is satisfied.
｜Y3−Y2｜＞α・｜Y2−Y1｜
以上、３条件が成立したときは制御動作が不安
定化した、つまりハンチングが発生したと判断す
る。 |Y 3 −Y 2 |>α・|Y 2 −Y 1 | When the above three conditions are satisfied, it is determined that the control operation has become unstable, that is, hunting has occurred.
〔発明が解決しようとする問題点〕
しかし、この方法では制御ゲインは弱める方向
だけであり、したがつて、一度制御ゲインを弱め
ると、強める手段がないためプロセスゲインの広
範囲な変動に対して制御ゲインが弱くなる場合が
生じるという問題点がある。[Problem to be solved by the invention] However, in this method, the control gain is only in the direction of weakening, and therefore, once the control gain is weakened, there is no way to strengthen it, so the control gain cannot be controlled over a wide range of fluctuations in process gain. There is a problem that the gain may become weak.
本発明は、このような点に鑑みてなされ、吹錬
が進むにつれて炉口・スカート間が密閉状態にさ
れ、従つてこの過程において炉口・スカート間間
隔が急変するような密閉形転炉廃ガス処理装置に
おいて、制御パラメータを適応させることのでき
る炉圧制御方法を提供することを目的とする。
The present invention has been made in view of these points, and is designed to solve the problem of closed converter waste, where the space between the furnace mouth and the skirt is sealed as the blowing progresses, and the distance between the furnace mouth and the skirt changes suddenly during this process. An object of the present invention is to provide a furnace pressure control method that can adapt control parameters in a gas treatment device.
このような目的を達成するために、本発明は、
調節手段からの操作出力および炉圧の各々に基づ
き制御動作が不安定領域にあるか否かを個別に判
断し、炉圧の振幅が所定値より小であるか否かを
判別し、前記調節手段からの操作出力および炉圧
が共に不安定領域にない状態、および、炉圧の振
幅が所定値より小でない状態が所定時間以上継続
したときは、制御パラメータが弱いものと判断
し、前記調節手段の制御パラメータを一段階強め
ることを特徴とする。
In order to achieve such an objective, the present invention
It is determined individually whether the control operation is in an unstable region based on the operating output from the adjustment means and the furnace pressure, and it is determined whether the amplitude of the furnace pressure is smaller than a predetermined value, and the adjustment is performed. When both the operating output from the means and the furnace pressure are not in the unstable region, and when the amplitude of the furnace pressure is not smaller than a predetermined value for a predetermined period of time or more, it is determined that the control parameter is weak, and the adjustment is performed. It is characterized by strengthening the control parameter of the means by one step.
つまり、特開昭58−168106号公報に記載されて
いるプロセス制御の不安定状態判別方式は、要約
すると、プロセスのフイードバツク制御におい
て、プロセス変数が時間に対して振動的に変化
し、しかもその振動の減衰が遅く、操作変数も同
じく振動しその減衰が遅いという状態にあり、そ
の上プロセス変数の振動周期と操作変数の振動周
期がほぼ等しければ、ハンチングが発生したと判
断するという原理に立つているが、本発明ではこ
の考え方をさらに拡張し、プロセス変数（炉内圧
力）および操作変数（調節計出力）が時間に対し
て振動的に変化していない状態が一定時間以上継
続すれば安定であると判別し、制御ゲインを一段
階強める適応制御を行なうようにする。
In other words, the unstable state determination method for process control described in JP-A No. 58-168106 can be summarized as follows: In process feedback control, a process variable changes oscillally over time, and It is based on the principle that hunting is determined to have occurred if the process variable oscillates and its decay is slow, and if the oscillation period of the process variable and the oscillation period of the manipulated variable are approximately equal. However, in the present invention, this idea is further extended, and the process variable (furnace pressure) and the manipulated variable (controller output) are stable if they do not change oscillatingly with respect to time for a certain period of time. It is determined that there is one, and adaptive control is performed to increase the control gain by one step.
第１図は本発明の一実施例を説明するための構
成概要図である。先ず、転炉廃ガス処理装置の構
成概要から説明する。
FIG. 1 is a schematic configuration diagram for explaining one embodiment of the present invention. First, an overview of the configuration of the converter waste gas treatment equipment will be explained.
転炉１の中に屑鉄と溶けた銑鉄（溶銑）２を入
れた後、ランス３を通して高圧酸素を吹きつけて
精錬（これを吹錬という）を行ない、吹錬終了後
に転炉１を傾けて出鋼する。この吹錬の際、ラン
ス３から吹き込まれた酸素ジエツトは溶けた銑鉄
のＣと反応し、COに富む大量の廃ガスを発生す
る。一方、酸素ジエツトと鋼浴の衝突面は非常に
高温になり、鋼浴のFeが気化するため多量の酸
化鉄粉も発生する。従つて、廃ガス処理装置とし
ては、大量、高温の廃ガスを冷却する設備と集塵
する設備とに分けられる。このようにして発生し
た高温、多塵の大量の廃ガスは、誘引送風機１１
により誘引されて煙道内を流れるわけであるが、
その際、例えば冷却水管群から成るガス冷却器７
において冷却された後、１次集塵器６において粗
いダストの捕集がなされ、続く２次集塵器８にお
いて微細なダストの最終集塵がなされ、かくして
除塵清浄化された廃ガスは、誘引送風機１１を経
て図示せざるガスホルダなどに燃料として回収さ
れる。ところで、転炉１においては、吹錬の中期
には大量のガスを発生するが、その初期や末期に
おいては発生量は少ない。また吹錬中において副
原料を投入したり、ランス３から吹きつける酸素
の量を変えても廃ガスの発生量は変動する。この
ような廃ガス発生量の変動によりフード５内のガ
ス圧も変動する。そこで、フード５内のガス圧が
適当な範囲内に収まるよう廃ガスの流量制御が行
なわれている。 After putting scrap iron and molten pig iron (hot metal) 2 into the converter 1, high-pressure oxygen is blown through the lance 3 to perform refining (this is called blowing), and after the blowing is completed, the converter 1 is tilted. To tap steel. During this blowing, the oxygen jet blown from lance 3 reacts with the carbon in the molten pig iron, generating a large amount of waste gas rich in CO. On the other hand, the collision surface between the oxygen jet and the steel bath becomes extremely hot, and as the Fe in the steel bath vaporizes, a large amount of iron oxide powder is also generated. Therefore, waste gas treatment equipment can be divided into equipment that cools large amounts of high-temperature waste gas and equipment that collects dust. A large amount of high-temperature, dusty waste gas generated in this way is transferred to the induced blower 11.
It flows through the flue due to the attraction of
In this case, for example, a gas cooler 7 consisting of a group of cooling water pipes
After being cooled in the primary dust collector 6, the coarse dust is collected in the secondary dust collector 8, and the fine dust is finally collected in the secondary dust collector 8. It passes through the blower 11 and is collected as fuel in a gas holder (not shown) or the like. By the way, in the converter 1, a large amount of gas is generated in the middle stage of blowing, but the amount generated is small in the early stage and final stage. Further, even if auxiliary raw materials are added during blowing or the amount of oxygen blown from the lance 3 is changed, the amount of waste gas generated varies. Due to such fluctuations in the amount of waste gas generated, the gas pressure within the hood 5 also fluctuates. Therefore, the flow rate of the waste gas is controlled so that the gas pressure within the hood 5 falls within an appropriate range.
すなわち、フード５内のガス圧を検出し、炉圧
発信器１２から調節計１４へ送る。調節計１４で
は、予め設定されている設定値とガス圧を比較
し、その差が零になるように操作出力信号をダン
パ操作器１５に送り、２次ダンパ９の開閉動作を
制御して廃ガス流量を調節する。スカート４は、
吹錬初期は開放状態で上に上つているが、吹錬が
進むにつれて降下し、炉口に密着するまで降下す
る。その後、さらに密閉性を高めるため、外側シ
ール１７を閉める。この過程において炉口間隔は
急変し、従つてプロセスパラメータも急変する。
このプロセスパラメータの変動に対して、制御パ
ラメータの強弱を炉口圧力と操作出力より判別
し、制御パラメータが強い場合は前述の如き判別
方式によつてハンチングを検知し、制御パラメー
タを１段階弱める。また、制御パラメータが弱い
場合は、１段階強めることにより常に安定且つ最
適な制御パラメータを適応させるようにする。 That is, the gas pressure in the hood 5 is detected and sent from the furnace pressure transmitter 12 to the controller 14. The controller 14 compares the gas pressure with a preset value, and sends an operation output signal to the damper operator 15 so that the difference becomes zero, and controls the opening/closing operation of the secondary damper 9 to eliminate waste. Adjust gas flow rate. Skirt 4 is
At the beginning of the blowing, it is open and rising upwards, but as the blowing progresses, it descends until it is in close contact with the furnace mouth. Thereafter, the outer seal 17 is closed to further improve sealing performance. During this process, the gap between the furnace openings changes suddenly, and therefore the process parameters also change suddenly.
With respect to variations in process parameters, the strength of the control parameters is determined from the furnace mouth pressure and the operating output, and if the control parameters are strong, hunting is detected by the above-described determination method and the control parameters are weakened by one step. Furthermore, if the control parameters are weak, the control parameters are strengthened by one step so that stable and optimal control parameters are always applied.
ここで、制御パラメータを１段階強める場合に
ついて、第２図を参照して説明する。なお、第２
図はかかる場合の動作を説明するためのフローチ
ヤートである。 Here, a case where the control parameters are strengthened by one step will be explained with reference to FIG. 2. In addition, the second
The figure is a flowchart for explaining the operation in such a case.
すなわち、炉口圧力Poと操作出力MVをそれ
ぞれ監視し（，′参照）、振動周期が不安定領
域にあるか否かを判別する。なおこの判別の方法
としては、上述の如き不安定化判別方式が用いら
れることは云う迄もない。そして、それぞれの振
動周期が不安定領域にない場合は（参照）、炉
圧Poの振幅がΔx（半固定値）より小であるか否
かを判別する（参照）。上記の条件がそろつた
状態がＴ秒間以上継続した場合は（参照）、プ
ロセスゲインに比べ制御ゲインが弱いものと判断
し、制御ゲインを１段階（1.5倍程度）強めて制
御を継続させる。なお、このような処理は、第１
図の演算器１６によつて行なわれる。つまり、演
算器１６は操業条件によつて変動するプロセスゲ
インに対し、制御ゲインが適正であるか否かを相
対的に判別し、適正でない場合は適宜な制御ゲイ
ンを適応させる機能を有している。したがつて、
調節計１４は演算器１６からの出力を受けてその
ゲインを自動的に変更し得る形式のものであり、
通常はデイジタル式調節計が使用される。 That is, the furnace mouth pressure Po and the operating output MV are monitored (see , '), and it is determined whether the vibration period is in the unstable region. It goes without saying that the destabilization discrimination method described above is used as a method for this discrimination. If each vibration period is not in the unstable region (see), it is determined whether the amplitude of the furnace pressure Po is smaller than Δx (semi-fixed value) (see). If the above conditions continue for T seconds or more (see), it is determined that the control gain is weaker than the process gain, and the control gain is increased by one step (approximately 1.5 times) to continue control. Note that such processing is performed in the first
This is performed by the arithmetic unit 16 shown in the figure. In other words, the calculator 16 has a function of relatively determining whether or not the control gain is appropriate with respect to the process gain that varies depending on the operating conditions, and if it is not appropriate, adapting the appropriate control gain. There is. Therefore,
The controller 14 is of a type that can automatically change its gain in response to the output from the calculator 16,
A digital controller is usually used.
上述の如く、本発明においては、炉圧の振幅が
所定値Δxより小であるか否かを判別するように
しているが、これは次のような理由に基づいてい
る。即ち、不安定現象が認められないときは、
制御パラメータが適切な場合、制御パラメータ
が弱い場合がある。これを区別するために、本発
明においては、炉圧の振幅に着目し、炉圧の振幅
が所定値Δxより一定時間大きい場合は制御パラ
メータが弱いとして判断するようにした。炉圧の
振幅が所定値Δxより小さい場合、制御パラメー
タは適切と判断し、現在値をそのまま用いる。 As described above, in the present invention, it is determined whether the amplitude of the furnace pressure is smaller than the predetermined value Δx, and this is based on the following reason. In other words, when no instability phenomenon is observed,
When the control parameters are appropriate, the control parameters may be weak. In order to distinguish this, in the present invention, attention is paid to the amplitude of the furnace pressure, and if the amplitude of the furnace pressure is greater than the predetermined value Δx for a certain period of time, it is determined that the control parameter is weak. If the amplitude of the furnace pressure is smaller than the predetermined value Δx, the control parameters are determined to be appropriate and the current values are used as they are.
なお、上記では主として調節計の比例ゲインを
調節する場合について説明したが、必要に応じて
積分時定数や微分時定数を調節することができ
る。 Note that, although the case where the proportional gain of the controller is mainly adjusted has been described above, the integral time constant and the differential time constant can be adjusted as necessary.
本発明によれば、スカート高さの急変、外側シ
ール開閉によるスカートと炉口間の間隔の急変に
よるプロセスゲイン変化に対し、その時の制御パ
ラメータの適正値をハンチング傾向にあるか否か
で判別し、その結果に応じて適正な制御パラメー
タを適応させることが出来るので、通常操業から
密閉操業までの広範囲な操業が可能となり、廃ガ
ス回収率の向上、操業の安定化を図ることができ
る利点がもたらされる。
According to the present invention, when a process gain changes due to a sudden change in the skirt height or a sudden change in the gap between the skirt and the furnace opening due to the opening and closing of the outer seal, the appropriate value of the control parameter at that time is determined based on whether or not there is a hunting tendency. Since it is possible to adapt appropriate control parameters according to the results, a wide range of operations from normal operation to closed operation is possible, which has the advantage of improving waste gas recovery rate and stabilizing operation. brought about.
第１図は本発明の実施例を示す概略構成図、第
２図は制御パラメータを一段強める場合の動作を
説明するためのフローチヤート、第３図は不安定
化判別方式を説明するためのグラフである。
符号説明、１……転炉、２……溶銑、３……ラ
ンス、４……スカート、５……フード、６……１
次集塵器、７……ガス冷却器、８……２次集塵
器、９……２次ダンパ、１０……ベンチユリ、１
１……誘引送風機、１２……炉圧発信器、１３…
…スカート位置計、１４……炉圧調節計、１５…
…ダンパ操作端、１６……演算器、１７……外側
シール。
Fig. 1 is a schematic configuration diagram showing an embodiment of the present invention, Fig. 2 is a flowchart for explaining the operation when the control parameters are further strengthened, and Fig. 3 is a graph for explaining the destabilization determination method. It is. Code explanation, 1...Converter, 2...Hot metal, 3...Lance, 4...Skirt, 5...Hood, 6...1
Secondary dust collector, 7... Gas cooler, 8... Secondary dust collector, 9... Secondary damper, 10... Bench lily, 1
1... Induced blower, 12... Furnace pressure transmitter, 13...
...Skirt position meter, 14...Furnace pressure regulator, 15...
...Damper operating end, 16...Arithmetic unit, 17...Outer seal.
Claims (1)
圧を所定の設定値と比較しその偏差に応じた制御
信号を出力する炉圧調節手段と、該調節手段から
の制御信号に基づいて炉内から発生する廃ガスの
流量を制御する流量制御手段とから成り、炉口と
スカートとの間を密閉またはこれと略同等の状態
にし、前記炉圧を所定値となるように制御する密
閉形転炉廃ガス処理装置における炉圧制御方法で
あつて、 前記調節手段からの操作出力および炉圧の各々
に基づき制御動作が不安定領域にあるか否かを個
別に判断し、 炉圧の振幅が所定値より小であるか否かを判別
し、 前記調節手段からの操作出力および炉圧が共に
不安定領域にない状態、および、炉圧の振幅が所
定値より小でない状態が所定時間以上継続したと
きは、制御パラメータが弱いものと判断し、 前記調節手段の制御パラメータを一段階強め
る、ことを特徴とする密閉形転炉廃ガス処理装置
における炉圧制御方法。[Scope of Claims] 1. Furnace internal pressure (furnace pressure) detection means, furnace pressure adjustment means that compares the detected furnace pressure with a predetermined set value and outputs a control signal according to the deviation, and the adjustment means and a flow rate control means for controlling the flow rate of waste gas generated from inside the furnace based on a control signal from the furnace, and the furnace pressure is kept at a predetermined value by keeping the space between the furnace mouth and the skirt sealed or in a substantially equivalent state. A method for controlling furnace pressure in a closed converter waste gas treatment equipment, the method comprising individually determining whether or not the control operation is in an unstable region based on the operating output from the adjusting means and the furnace pressure. determine whether the amplitude of the furnace pressure is smaller than a predetermined value, and determine whether the operating output from the adjusting means and the furnace pressure are both not in an unstable region, and the amplitude of the furnace pressure is less than the predetermined value. Furnace pressure control in a closed converter waste gas treatment device, characterized in that when a state in which the pressure is not lower continues for more than a predetermined time, it is determined that the control parameter is weak, and the control parameter of the adjustment means is strengthened by one step. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60012567A JPS61174308A (en) | 1985-01-28 | 1985-01-28 | Furnace pressure control device in converter waste gas treatment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60012567A JPS61174308A (en) | 1985-01-28 | 1985-01-28 | Furnace pressure control device in converter waste gas treatment device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61174308A JPS61174308A (en) | 1986-08-06 |
| JPH0411604B2 true JPH0411604B2 (en) | 1992-03-02 |
Family
ID=11808927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60012567A Granted JPS61174308A (en) | 1985-01-28 | 1985-01-28 | Furnace pressure control device in converter waste gas treatment device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61174308A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013155898A (en) * | 2012-01-27 | 2013-08-15 | Nippon Steel & Sumitomo Metal Corp | Steam pressure control method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6720071B2 (en) | 2001-02-21 | 2004-04-13 | Ntn Corporation | Tip seal and seal material for scroll type compressor |
-
1985
- 1985-01-28 JP JP60012567A patent/JPS61174308A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013155898A (en) * | 2012-01-27 | 2013-08-15 | Nippon Steel & Sumitomo Metal Corp | Steam pressure control method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61174308A (en) | 1986-08-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |