JPS6399415A - Furnace pressure control device - Google Patents
Furnace pressure control deviceInfo
- Publication number
- JPS6399415A JPS6399415A JP61244351A JP24435186A JPS6399415A JP S6399415 A JPS6399415 A JP S6399415A JP 61244351 A JP61244351 A JP 61244351A JP 24435186 A JP24435186 A JP 24435186A JP S6399415 A JPS6399415 A JP S6399415A
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- flow rate
- furnace pressure
- set value
- damper
- 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.)
- Pending
Links
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 239000000446 fuel Substances 0.000 abstract description 28
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract 1
- 230000004044 response Effects 0.000 description 4
- 238000009530 blood pressure measurement Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/02—Regulating fuel supply conjointly with air supply
- F23N1/022—Regulating fuel supply conjointly with air supply using electronic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/04—Measuring pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、加熱炉の炉内圧制御における制御０性の改善
に関するものである。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to improvement of controllability in controlling the internal pressure of a heating furnace.
〈従来技術〉
炉内圧制御は、炉扉の開閉に伴う侵入空気防止、炉内ガ
ス流の安定化及び排ガスの炉外吹出し防止が目的であり
、燃焼制御＃ ０２． ＋１０！制御や加熱能力、炉効
率に大きな影響を与えるため、加熱炉の重要な制御の一
つである。<Prior art> The purpose of furnace pressure control is to prevent air from entering when the furnace door is opened and closed, to stabilize the gas flow in the furnace, and to prevent exhaust gas from blowing out of the furnace.Combustion control #02. +10! It is one of the important controls for heating furnaces, as it has a major impact on control, heating capacity, and furnace efficiency.
炉内圧は大気圧よりやや高い圧力に保たれるように制御
される。従来の制御では炉内の適当なポイント、通常は
バーナーの火災からの影響を受けにくい炉天井付近から
微差圧発信器により測定し、その測定値と大気圧よりや
や高い一定の設定値と比較し、その偏差信号に基づいて
排ガスダンパーの開度を炉内圧調節計により操作する。The pressure inside the furnace is controlled to be maintained at a pressure slightly higher than atmospheric pressure. In conventional control, a differential pressure transmitter is used to measure the pressure at an appropriate point in the furnace, usually near the furnace ceiling, where it is not easily affected by burner fires, and the measured value is compared with a set value slightly higher than atmospheric pressure. Based on the deviation signal, the opening degree of the exhaust gas damper is controlled by the furnace pressure regulator.
また、大きな外乱要因である入口側及び出口側の開閉に
伴う炉内圧変動に関しては、必要に応じて炉扉の開閉シ
ーケンス信号と炉内圧の測定値を受ける学習演算手段に
より、ダンパー開閉の操作信号にフィードフォワード信
号を加算することによって予測的に操作し、総合的に圧
力変動を最小にする手段が設けられる場合もある。In addition, regarding furnace internal pressure fluctuations due to the opening and closing of the inlet and outlet sides, which are a major disturbance factor, a learning calculation means that receives the opening/closing sequence signal of the furnace door and the measured value of the furnace internal pressure is used to generate operation signals for opening and closing the damper. In some cases, means may be provided to operate predictively by adding a feedforward signal to minimize overall pressure fluctuations.
このような構成をとる従来装置の一例を第３図により説
明する。１は加熱部、１ａは入口ＩＩ １７％、１ｂは
出口側扉、２，２゛は炉内２ケ所に設けた炉内圧センサ
ーで、ＰＶ、、 ＰＶ、’は夫々の圧力測定値を示す。An example of a conventional device having such a configuration will be explained with reference to FIG. 1 is the heating section, 1a is the inlet II 17%, 1b is the exit door, 2 and 2 are the furnace pressure sensors installed at two locations in the furnace, and PV, PV,' indicate the respective pressure measurement values.
これら測定値は切換スイッチ３を介して炉内圧調節計４
に与えられる。These measured values are sent to the furnace pressure regulator 4 via the changeover switch 3.
given to.
この調節計４は、ＰＶ、またはＰＶ、’と圧力測定値Ｓ
■１の偏差に基づいて比例積分演算を実行して操作出力
ＭＶ、をダンパーアクチュエータ５に供給する。This controller 4 has PV, or PV,' and pressure measurement S.
(2) A proportional-integral calculation is performed based on the deviation of 1, and the operation output MV is supplied to the damper actuator 5.
６はＪ’ｔガスを導びく煙道、７はこの煙道の途中に設
けた炉内圧制御用排ガスダンパーで、その操作レバー７
０１がダンパーアクチュエータ５の出力レバー５０１に
連動して操作される。８はダンパー７の開度発信器、８
は必要に応じて煙道に設けられる吸引ファン（ＩＤＦ）
、９はレキュペレータである。6 is a flue that guides J't gas, 7 is an exhaust gas damper for controlling the furnace internal pressure installed in the middle of this flue, and its operation lever 7
01 is operated in conjunction with the output lever 501 of the damper actuator 5. 8 is the opening transmitter of damper 7, 8
is a suction fan (IDF) installed in the flue as necessary.
, 9 is a recuperator.
１０は炉内の湿度センサー、ｐＬはその測定出力、１１
は炉温調節計で、測定値ＰＶ、と炉温設定的Ｓｖ、との
偏差を制御演算した操作出力信号をマスター信号ＭＶｚ
として発信し、これがカスケード接続された燃料流量調
節計１２に設定値として供給される。１３は燃料Ｆの供
給管路、１４は流量センサーで、その測定値は調節計１
２に測定値ＰＶ、とじて供給される。１５は燃料流量の
制御弁で、調節計１２の操作出力ＭＬを受けて駆動され
る。10 is the humidity sensor in the furnace, pL is its measurement output, 11
is a furnace temperature controller, and a master signal MVz is an operation output signal obtained by controlling and calculating the deviation between the measured value PV and the furnace temperature setting Sv.
This signal is transmitted as a set value to the cascade-connected fuel flow rate controller 12. 13 is a fuel F supply pipe, 14 is a flow rate sensor, and the measured value is sent to controller 1.
2, the measured value PV is combined and supplied. Reference numeral 15 denotes a fuel flow rate control valve, which is driven in response to the operating output ML of the controller 12.
め
こ１図示しないが、空気流量の調節手段が設けられ、マ
スター信号ＭＹ□をカスケード設定値として受ける空気
流量調節計により、燃料と一定比率の空気が炉内に供給
される。Meko 1 Although not shown, an air flow rate adjustment means is provided, and an air flow rate controller that receives the master signal MY□ as a cascade setting value supplies air at a fixed ratio to fuel into the furnace.
１６．１７は入口側炉扉１ａの開、閉を検出するセンサ
ー、１８．１９は出口側の炉扉１ｂの開。16.17 is a sensor that detects opening and closing of the inlet side furnace door 1a, and 18.19 is an opening of the outlet side furnace door 1b.
閏を検出するセンサーで、これらセンサーの検出（ａ号
はシーケンス回路２０を介して学習演算手段２１に与え
られる。この学習演算手段は炉内圧の測定（１１ｉＰＶ
、、ＰＶ、°を監視していて、扉が開又は閉の時の測定
値の変動に基づいてフィードフォワード信号Ｆ−Ｆを算
出してダンパー開度調節計４の操作出力ＭＹ、に加算し
、扉の開閉による外乱に基づく炉内圧の変動が最小とな
るようなフィードフォワード制御を実現する。The detection (a) of these sensors is given to the learning calculation means 21 via the sequence circuit 20. This learning calculation means is used to measure the furnace internal pressure (11iPV
, PV, ° is monitored, and the feedforward signal FF is calculated based on the fluctuation of the measured value when the door is open or closed, and added to the operation output MY of the damper opening controller 4. , realizes feedforward control that minimizes fluctuations in the furnace internal pressure due to disturbances caused by opening and closing the door.
〈発明が解決すべき問題点〉
炉内圧の設定値は前述のように、通常は微小正圧である
が、炉によっては挿入鋼片が熱片であつたり冷片であっ
たりしてその負荷状況の変化が大きい場合がある。この
場合、炉内圧を一定にしたままであると、負荷の変動に
より低負荷となったとき、炉に吹き込まれる燃料や空気
の量が少なくなり、炉内圧を一定にする為にダンパーを
閉じざるを得なくなる。<Problems to be solved by the invention> As mentioned above, the set value of the furnace pressure is usually a small positive pressure, but depending on the furnace, the inserted steel pieces may be hot pieces or cold pieces, and the load may vary. The situation may change significantly. In this case, if the furnace pressure remains constant, when the load becomes low due to load fluctuations, the amount of fuel and air blown into the furnace will decrease, forcing the damper to close to keep the furnace pressure constant. You won't get any more.
従って、炉内圧の設定を誤まれば、負荷がある一定以下
になると（燃料流量がある一定値以下となると）ダンパ
ーがほぼ全閉となり、炉内圧の制御が不可能となる。炉
内圧の制御が不調となると、温度制御、０２制御等の炉
の基本的な制御に＋Ｊｉ影７を及ぼす結果となる。Therefore, if the furnace pressure is incorrectly set, the damper becomes almost fully closed when the load falls below a certain level (when the fuel flow rate falls below a certain level), making it impossible to control the furnace pressure. If the control of the furnace internal pressure becomes unsatisfactory, the basic controls of the furnace such as temperature control and 02 control will be adversely affected.
本発明の目的は、このような負荷変動に対して自刃的に
炉内圧の設定を変更し、ダンパーの開度を常に炉内圧制
御の最適位置に保持せしめることが可能な炉内圧制御装
置の提供にある。An object of the present invention is to provide a furnace pressure control device that can automatically change the furnace pressure setting in response to such load fluctuations and maintain the damper opening at the optimum position for furnace pressure control. It is in.
く問題点を解決するための手段〉
本発明の構成上の特徴は、加熱炉の炉内圧測定値と設定
値との偏差に基づいて煙道に設けた排ガスダンパーの開
度を制御する炉内圧制御装置において、上記加熱炉に供
給される燃料流量の測定値に基づいて上記炉内圧設定値
をプログラム的に変更する手段を設け、上記ダンパーの
開度を炉圧制御の最適範囲に維持せしめる点にある。Means for Solving the Problems> The structural feature of the present invention is that the furnace internal pressure is controlled to control the opening degree of the exhaust gas damper provided in the flue based on the deviation between the furnace internal pressure measurement value and the set value of the heating furnace. In the control device, means is provided for programmatically changing the furnace internal pressure set value based on the measured value of the fuel flow rate supplied to the heating furnace, and the opening degree of the damper is maintained in the optimal range for furnace pressure control. It is in.
く作用〉
本発明によれば、負荷の変動に伴って変化する燃料流量
の測定値に基づいて、炉内圧調節計の設定値がプログラ
ム的に変更され、ダンパーの開度は常に炉内圧制御を実
行するのに最適の開度範囲を保する。According to the present invention, the set value of the furnace pressure regulator is changed programmatically based on the measured value of the fuel flow rate that changes with load fluctuations, and the opening degree of the damper is always controlled under the furnace pressure control. Maintain the optimum opening range for execution.
〈実施例〉 第１図に基づき本発明の一実施例を説明する。<Example> An embodiment of the present invention will be described based on FIG.
第３図と同一要素には、同一符号を付してその説明は省
略する。The same elements as in FIG. 3 are given the same reference numerals and their explanations will be omitted.
本発明装はの特徴部分は、燃料流量の測定値ＰＶ４を受
けるフィルタ２２と、このフィルタの出力Ｐｖ４°を入
力する炉内圧パターン設定器２３の構成にある。The feature of the present invention lies in the configuration of the filter 22 which receives the measured value PV4 of the fuel flow rate, and the furnace pressure pattern setter 23 which inputs the output Pv4° of this filter.
この炉内圧パターン設定（社）２３は、燃料流量の変化
に対応して炉内圧設定値Ｓｖ１を一定の設定パターンに
従って変更して炉内圧調節計４に供給する。The furnace internal pressure pattern setting company 23 changes the furnace internal pressure set value Sv1 according to a fixed setting pattern in response to a change in the fuel flow rate, and supplies the changed furnace internal pressure setting value Sv1 to the furnace internal pressure regulator 4.
燃料流量の測定値ＰＬを入力するフィルタ２２は、燃料
流量の短時間の変動を吸収した燃料流量信号ＰＶ、°を
炉内圧パターン設定器に出力するもので、燃料流量の短
時間変動に対して炉内圧設定値が変更されないように挿
入されたものである。The filter 22, which inputs the measured value PL of the fuel flow rate, outputs a fuel flow signal PV,° that absorbs short-term fluctuations in the fuel flow rate to the furnace pressure pattern setter. It was inserted to prevent the furnace internal pressure set value from being changed.
炉内圧パターン設定器２３の特性は、ブロック２３内に
図示される。即ち、燃料流量が小さい時は炉内圧の定値
制御ではダンパーが閉じる傾向となるので、炉内圧設定
（ｖＪＳＶ、を低目に設定してダンパを過当な開度位置
に保持させるようにする。The characteristics of the furnace pressure pattern setter 23 are illustrated in block 23. That is, when the fuel flow rate is small, the damper tends to close under constant value control of the furnace pressure, so the furnace pressure setting (vJSV) is set low to maintain the damper at an appropriate opening position.
燃＃：１流量が増大するに従って炉内圧設定値を増加さ
せ、ある燃料流量以上では従来と同様な定値制御とすべ
く、設定値Ｓｖ１を一定にする。Fuel #: 1 As the flow rate increases, the furnace internal pressure set value is increased, and above a certain fuel flow rate, the set value Sv1 is kept constant in order to perform constant value control similar to the conventional method.
このような燃料流量に応じた炉内圧のパターン変更によ
って、負荷が小さい場合にダンパー開度が小さくなりす
ぎて炉内圧の制御が回灯となる欠点が解消される。By changing the pattern of the furnace internal pressure according to the fuel flow rate, the disadvantage that the damper opening degree becomes too small when the load is small and the furnace internal pressure is controlled in a roundabout manner can be solved.
炉内圧の変更パターンは、第１図の実施例の場合は、あ
らかじめ炉内圧パターン設定器２３内に設定しておく構
成であるが、学習演算手段を用いてＡｍパターンになる
ように修正して決定することも可能である。In the case of the embodiment shown in FIG. 1, the furnace pressure change pattern is set in advance in the furnace pressure pattern setter 23, but it is modified to become the Am pattern using learning calculation means. It is also possible to decide.
第２図はこのような場合の実施例を示すもので、学習演
算手段２４は燃料流量に関連したフィルタ２２の出力ｐ
ｖ４’とダンパーの５の開度発信器２５の開度信号Ｐｖ
、を受けて、ＰＶ、’のスパンの範囲でダンパー開度が
常に連節な範囲内にあるように、パターンを修正する。FIG. 2 shows an embodiment in such a case, in which the learning calculation means 24 calculates the output p of the filter 22 related to the fuel flow rate.
v4' and the opening signal Pv of the opening transmitter 25 of the damper 5
, the pattern is modified so that the damper opening is always within the articulated range within the span of PV,'.
このようなパターン修正によって、負荷状況に対応した
最適な炉内圧設定値を得ることができる。By modifying the pattern in this manner, it is possible to obtain an optimal furnace pressure set value corresponding to the load situation.
〈効果〉
以上説明したように、本発明によれば、扉の開閉等によ
る外乱に対する炉内圧の制御を、ダンパーの開度により
操作する装五において、ダンパー開度を常に圧力制御可
能な範囲内に保持させるように炉内圧の設定値を自動的
に変更することができる。<Effects> As explained above, according to the present invention, in a system that controls the furnace internal pressure in response to disturbances such as opening and closing of a door by controlling the damper opening, the damper opening can always be kept within the pressure controllable range. The set value of the furnace pressure can be automatically changed so that the furnace pressure is maintained at .
加熱炉に要求される制御は得々あるが、主たるものは全
てこの炉内圧制御がうまく作動しない限り安定しないと
言ってよい。There are many controls that are required for heating furnaces, but it can be said that the furnace will not be stable unless the furnace internal pressure control is operated properly.
従って、負荷変動の激しい場合でも本発明により炉内圧
制御の基本は満足され、他の主要な制御への波及も最少
限に抑えることができる。Therefore, even in the case of severe load fluctuations, the present invention satisfies the basics of furnace internal pressure control, and the influence on other main controls can be minimized.
第１図は本発明の一実施例を示す構成図、第２図は本発
明の池の実施例を示す構成図、第３図は従来技術の一例
を示す構成図である。
１・・・加焼炉、２，２゛・・・炉内圧センサー、４・
・・炉内圧調節計、５・・・ダンパーアクチュエータ、
６・・・煙道、７・・・ダンパー、吸引ファン、１０・
・・温度センサー、１１・・・温度調節計、１２・・・
燃料流量調節計、１４・・・燃料流量センサー、２２・
・・フィルタ、２３・・・炉内圧パターン設定器、２４
・・・学習演算手段。FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing an embodiment of a pond according to the present invention, and FIG. 3 is a block diagram showing an example of the prior art. 1... Calcining furnace, 2, 2゛... Furnace pressure sensor, 4.
...Furnace pressure regulator, 5...Damper actuator,
6... flue, 7... damper, suction fan, 10.
...Temperature sensor, 11...Temperature controller, 12...
Fuel flow rate controller, 14...Fuel flow rate sensor, 22...
... Filter, 23 ... Furnace pressure pattern setting device, 24
...Learning calculation means.
Claims (1)
に設けた排ガスダンパーの開度を制御する炉内圧制御装
置において、上記加熱炉に供給される燃料流量の測定値
に基づいて上記炉内圧設定値をプログラム的に変更する
手段を設け、上記ダンパーの開度を炉圧制御の最適範囲
に維持せしめることを特徴とする炉内圧制御装置In a furnace internal pressure control device that controls the opening degree of an exhaust gas damper provided in a flue based on a deviation between a measured value of the furnace internal pressure of a heating furnace and a set value, A furnace pressure control device characterized by providing means for programmatically changing the furnace pressure set value to maintain the opening degree of the damper within an optimal range for furnace pressure control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61244351A JPS6399415A (en) | 1986-10-15 | 1986-10-15 | Furnace pressure control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61244351A JPS6399415A (en) | 1986-10-15 | 1986-10-15 | Furnace pressure control device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6399415A true JPS6399415A (en) | 1988-04-30 |
Family
ID=17117406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61244351A Pending JPS6399415A (en) | 1986-10-15 | 1986-10-15 | Furnace pressure control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6399415A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021021512A (en) * | 2019-07-25 | 2021-02-18 | 住友金属鉱山株式会社 | Method of controlling pressure in furnace |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57134618A (en) * | 1981-02-13 | 1982-08-19 | Hitachi Ltd | Furnace pressure control system in thermoelectric power plant |
| JPS6021639U (en) * | 1983-07-21 | 1985-02-14 | 三菱電機株式会社 | air conditioner |
-
1986
- 1986-10-15 JP JP61244351A patent/JPS6399415A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57134618A (en) * | 1981-02-13 | 1982-08-19 | Hitachi Ltd | Furnace pressure control system in thermoelectric power plant |
| JPS6021639U (en) * | 1983-07-21 | 1985-02-14 | 三菱電機株式会社 | air conditioner |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021021512A (en) * | 2019-07-25 | 2021-02-18 | 住友金属鉱山株式会社 | Method of controlling pressure in furnace |
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