JPH083365B2 - Combustion air flow controller - Google Patents
Combustion air flow controllerInfo
- Publication number
- JPH083365B2 JPH083365B2 JP62005479A JP547987A JPH083365B2 JP H083365 B2 JPH083365 B2 JP H083365B2 JP 62005479 A JP62005479 A JP 62005479A JP 547987 A JP547987 A JP 547987A JP H083365 B2 JPH083365 B2 JP H083365B2
- Authority
- JP
- Japan
- Prior art keywords
- controller
- flow rate
- output
- opening
- air flow
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
- F23N3/002—Regulating air supply or draught using electronic means
-
- 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
- F23N5/184—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using electronic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2223/00—Signal processing; Details thereof
- F23N2223/08—Microprocessor; Microcomputer
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2235/00—Valves, nozzles or pumps
- F23N2235/02—Air or combustion gas valves or dampers
- F23N2235/06—Air or combustion gas valves or dampers at the air intake
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/003—Systems for controlling combustion using detectors sensitive to combustion gas properties
- F23N5/006—Systems for controlling combustion using detectors sensitive to combustion gas properties the detector being sensitive to oxygen
-
- 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)
Description
【発明の詳細な説明】 ＜産業上の利用分野＞ 本発明は、ボイラの燃焼制御装置における空気流量制
御の制御性の改善に関する。TECHNICAL FIELD The present invention relates to improvement in controllability of air flow rate control in a combustion control device for a boiler.
＜従来技術＞ 第３図に基いて従来技術の一例を説明する。燃焼制御
における空気流量制御は、空気流量測定値に基づくベー
ン又はダンパー開度制御と、主蒸気流量に基づく押込フ
ァンの回転数制御の２系統で実行するのが一般である。<Prior Art> An example of the prior art will be described with reference to FIG. The air flow rate control in the combustion control is generally executed by two systems, that is, the vane or damper opening control based on the air flow rate measurement value and the rotation speed control of the pushing fan based on the main steam flow rate.
１は差圧式センサーで測定される空気流量FTの信号
源、２は開平演算器、３は第１関数演算器であり、空気
流量信号を燃料ベースの信号に変換する。４は除算器で
あり、第１関数演算器の出力に対して酸素濃度測定値の
信号源５の信号O2で除算して酸素濃度の変動を補正した
測定値PV1を第１調節計６に与える。Reference numeral 1 is a signal source of the air flow rate FT measured by a differential pressure sensor, 2 is a square root calculator, and 3 is a first function calculator, which converts the air flow signal into a fuel-based signal. Reference numeral 4 denotes a divider, which divides the output of the first function calculator by the signal O 2 of the signal source 5 of the oxygen concentration measurement value and corrects the variation of the oxygen concentration to obtain the measured value PV 1 of the first controller 6 Give to.
７はこの調節計に空気流量の設定値SV1を与えるハイ
セレクターであり、通常はボイラマスタ信号源８の信号
BMを選択するが、全燃料信号源の信号TFTをバイアス設
定器10により一定バイアスを減じた信号又はミニマムフ
ロー設定器11の出力がボイラマスタ信号を上回ったとき
はこの信号を設定値として選択する。Reference numeral 7 is a high selector that gives a set value SV 1 of the air flow rate to this controller, and is usually a signal from the boiler master signal source 8.
BM is selected, but a signal obtained by subtracting a constant bias of the signal TFTs of all fuel signal sources by the bias setter 10 or when the output of the minimum flow setter 11 exceeds the boiler master signal, this signal is selected as a set value.
PV1とSV1との偏差を第１調節計６で制御演算した操作
出力MV1は、手動／自動操作器12および電流／空気圧変
換器13を介して空気管路のベーン又はダンパー14に導か
れてその開度が調節される。The operation output MV 1 obtained by controlling the deviation between PV 1 and SV 1 by the first controller 6 is introduced to the vane or damper 14 of the air line via the manual / automatic operation device 12 and the current / air pressure converter 13. Then, the opening is adjusted.
一方、主蒸気流量の信号源15の信号SFは、蒸気流量を
回転数に変換する第２関数演算器16により回転数ベース
の信号に変換され、変換信号が操作出力MV2として手動
／自動操作器17を介して回転数制御装置18に供給され
る。On the other hand, the signal SF of the signal source 15 of the main steam flow rate is converted into a rotation speed-based signal by the second function calculator 16 that converts the steam flow rate into rotation speed, and the converted signal is manually / automatically operated as the operation output MV 2. It is supplied to the rotation speed control device 18 via the device 17.
回転数制御装置18は、電圧周波数制御装置（VVVV
F），流体継手，オメガクラッチなどで実現される。The rotation speed control device 18 is a voltage frequency control device (VVVVV).
F), fluid coupling, omega clutch, etc.
この様な構成において、負荷変動すなわち主蒸気流量
変動に対しては押込ファンの回転数を変えることで大ま
かな空気供給量を制御し、ベーン又はダンパーの開度に
より微調整を実行する。In such a configuration, the rough air supply amount is controlled by changing the rotation speed of the pushing fan with respect to the load fluctuation, that is, the fluctuation of the main steam flow rate, and the fine adjustment is executed by the opening of the vane or the damper.
＜発明が解決しようとする問題点＞ ところが、主たる操作端である押込ファンは慣性を有
するために操作出力の変化に直ちにに応答せず回転数の
追従制御特性が良くない。<Problems to be Solved by the Invention> However, since the push-in fan, which is the main operation end, has inertia, it does not immediately respond to changes in the operation output, and the rotational speed follow-up control characteristic is poor.
ベーン又はダンパーの開度は、回転数制御のバランス
したしたところで安定するが、回転数制御の系とは独立
した制御系となっているために、バランス時の開度は不
確定となり、大きな負荷変動の場合では、ベーン又はダ
ンパーによる制御が不可能になる場合もある。The opening of the vane or damper is stable when the rotational speed control is balanced, but since it is a control system independent of the rotational speed control system, the opening during balancing becomes uncertain and a large load is applied. In the case of fluctuation, control by vanes or dampers may not be possible.
本発明は、この様な問題点を解消し、空気流量制御の
応答性を向上させると共にベーン又はダンパーの開度を
常に適正な開度に保持できる空気流量制御装置の提供を
目的とする。An object of the present invention is to provide an air flow rate control device that solves such problems and improves the responsiveness of air flow rate control and that can always maintain the opening degree of a vane or a damper at an appropriate opening degree.
＜問題点を解決するための手段＞ 本発明の構成上の特徴は、空気流量の測定値を燃料ベ
ースに変換する第１関数演算手段の出力値とボイラーマ
スター信号との偏差を制御演算する第１調節計の操作出
力で空気管路のベーン又はダンパー開度を調節すると共
に、主蒸気流量信号を押込ファンの回転数に変換する第
２関数演算手段の出力に基づく操作出力により空気管路
の押込ファンの回転数を変更する燃焼空気流量制御装置
において、上記第１調節計の操作出力と上記ベーン又は
ダンパー開度の適正開度設定値のと偏差を制御演算した
操作出力を上記第２演算出力値に加算する第２調節計
と、上記加算出力に基づいて上記第１調節計の比例帯を
変更するための第３関数演算手段とを具備せしめた点に
ある。<Means for Solving Problems> A structural feature of the present invention is that the deviation between the output value of the first function calculating means for converting the measured value of the air flow rate into the fuel base and the boiler master signal is controlled and calculated. (1) The vane or damper opening of the air conduit is adjusted by the operation output of the controller, and the operation output based on the output of the second function calculating means for converting the main steam flow rate signal into the rotation speed of the pushing fan In the combustion air flow rate control device for changing the rotation speed of the pushing fan, an operation output obtained by controlling and calculating a deviation between the operation output of the first controller and an appropriate opening set value of the vane or damper opening is used as the second operation. A second controller for adding to the output value and a third function calculating means for changing the proportional band of the first controller on the basis of the added output are provided.
＜作用＞ 本発明によれば第１調節計の操作出力とベーン又はダ
ンパーの適正開度設定値を入力する第２調節計の操作出
力が回転数制御の操作出力に加算されると共に、加算出
力を関数演算した出力により第１調節計の比例帯が変更
される。<Operation> According to the present invention, the operation output of the first controller and the operation output of the second controller for inputting the proper opening set value of the vane or damper are added to the operation output of the rotation speed control, and the addition output is added. The proportional band of the first controller is changed by the output of the function calculation of
＜実施例＞ 第１図に基いて本発明の実施例を説明する。第３図で
説明した要素と同一な構成要素については、同一符号を
付してその説明は省略し、本発明の特徴部分を追加説明
する。<Example> An example of the present invention will be described with reference to FIG. Constituent elements that are the same as the elements described in FIG. 3 are assigned the same reference numerals and explanations thereof are omitted, and characteristic portions of the present invention will be additionally described.
第１図において、鎖線で囲まれたブロックＡが本発明
の特徴構成部である。ブロック内において、19は第２調
節計であり、第１調節計の操作出力MV1を測定値とし、
ベーン又はダンパーの適正開度SVbを設定値として入力
し、その偏差を制御演算した操作出力MVbは上下限リミ
ター20を介して加算器21に入力されて第２関数演算手段
の操作出力MV2に加算される。加算された操作出力MV3は
手動／自動操作器17および変化率リミター23を介して回
転数制御装置18に導かれる。In FIG. 1, a block A surrounded by a chain line is a characteristic constituent part of the present invention. In the block, 19 is a second controller, and the operation output MV 1 of the first controller is a measured value,
The operation output MV b obtained by inputting the appropriate opening SV b of the vane or damper as a set value and controlling the deviation thereof is input to the adder 21 via the upper and lower limiter 20 and the operation output MV of the second function calculating means. Added to 2 . The added operation output MV 3 is guided to the rotation speed control device 18 via the manual / automatic operation device 17 and the change rate limiter 23.
22は第３関数演算手段であり、手動／自動操作器17の
操作出力を入力してこれに所定の関数演算を実行してそ
の演算出力により第１調節計の比例帯1/Kpを変更させ
る。Reference numeral 22 is a third function calculation means, which inputs the operation output of the manual / automatic operation device 17, executes a predetermined function calculation on this, and changes the proportional band 1 / K p of the first controller by the calculation output. Let
上記第２調節計の設定値SVbは、ベーン又はダンパー
の開度が70〜80％の値となるように選定される。また、
第３関数演算手段22の演算内容は、 １−MV3＋Ｂ（バイアス） とされ、加算器21の操作出力MV3が増加すれば比較帯は
狭くなり、第１調節計の利得は増加する。Set value SV b of the second controllers, the opening degree of the vane or damper is selected to a value 70-80%. Also,
The operation content of the third function operation means 22 is set to 1-MV 3 + B (bias), and if the operation output MV 3 of the adder 21 increases, the comparison band narrows and the gain of the first controller increases.
次に第２図のタイムチャートにより動作を説明する。
（Ａ）は負荷状態の変化、（Ｂ）は主蒸気流量の変化、
（Ｃ）はベーン開度の変化、（Ｄ）は押込ファンの回転
数変化をそれぞれ示す。Next, the operation will be described with reference to the time chart of FIG.
(A) changes in load condition, (B) changes in main steam flow rate,
(C) shows a change in the vane opening, and (D) shows a change in the rotation speed of the pushing fan.
時刻t1〜t2において負荷が一定の勾配で低下すると主
蒸気流量もこれに追従して低下する。At time t 1 ~t 2 when the load is lowered at a constant gradient also the main steam flow rate decreases following this.
主蒸気流量の変動は操作出力MV2の変化をもたらす
が、押込ファンの回転数はその慣性のため遅れるので、
従来の構成では空気流量の変化が小さく、従って第１調
節計の操作出力MV1は小さいのでベーン又はダンパーの
開度もほとんど変化しないので、追従の制御性は悪い。Fluctuations in the main steam flow rate cause changes in the operation output MV 2 , but the rotation speed of the forced draft fan is delayed due to its inertia.
In the conventional configuration, the change in the air flow rate is small, and therefore the operation output MV 1 of the first controller is small, so the opening of the vane or damper hardly changes, and the controllability of follow-up is poor.
本発明では、第３関数演算手段22の働きで、MV2の変
化，すなわちMV3変化によりただちに比例帯を大きくし
て利得を下げ、ベーン又はダンパーの開度を低下させて
空気流量を制限する操作をベーン側で実現する。In the present invention, the function of the third function calculating means 22 immediately increases the proportional band to reduce the gain by changing MV 2 , that is, changing MV 3 , and reduces the opening of the vane or damper to limit the air flow rate. The operation is realized on the vane side.
ベーン又はダンパー開度のこの様な強制的な操作によ
り、開度は適正開度からずれるので、第２調節計に偏差
が生じ、その操作出力MVbが発生し、開度が適正値にな
るように回転数制御の操作出力に加算されるので、負荷
に見合った適正な空気量を供給する回転数に達する時刻
t2においてはベーン又はダンパーの開度は設定値SVbで
与えられる適正開度を保持する制御が完了する。Due to such a forced operation of the vane or damper opening, the opening deviates from the proper opening, so that a deviation occurs in the second controller, the operation output MV b is generated, and the opening becomes the proper value. Since it is added to the operation output of the rotation speed control, the time to reach the rotation speed that supplies an appropriate amount of air according to the load.
opening of the vanes or dampers at t 2 is completed is controlled to retain the proper degree of opening given by the set value SV b.
時刻t3〜t4において発生する負荷の上昇変動に対して
も同様に、負荷変動により直ちに第３演算手段の出力で
第１調節計の比例帯が小さくされて利得を上昇させるこ
とによりベーン又はダンパー開度を一時的に開いて空気
流量を増加させる制御を実行した後、ベーン開度を適正
開度設定値に保持する制御ループにより適正開度に引き
戻す制御が実行される。Similarly the rise variation of the load generated at the time t 3 ~t 4, vanes or by raising the immediately to gain the proportional band is small in the first controllers at the output of the third arithmetic means by load variations After executing the control for temporarily opening the damper opening to increase the air flow rate, the control loop for maintaining the vane opening at the appropriate opening set value performs the control for returning to the appropriate opening.
＜発明の効果＞ 以上説明したように、本発明によれば負荷変動の発生
で直ちにベーン又はダンパー開度を調節する第１調節計
の比例帯を変化させることにより、応答の遅い押込ファ
ンの追従に先行して空気流量を制御できるので、負荷変
動に対する空気流量の制御性を著しく改善することがで
きる。<Effects of the Invention> As described above, according to the present invention, by changing the proportional band of the first controller that adjusts the vane or damper opening immediately when the load change occurs, the follow-up of the forced-injection fan having a slow response. Since the air flow rate can be controlled prior to, the controllability of the air flow rate with respect to load fluctuation can be significantly improved.
さらに、ベーン又はダンパーの操作を一時的なものと
し、常に適正開度を保持する制御ループによりベーン又
はダンパー開度を制御可能な開度で且つ出来るだけ開い
た適正開度（70〜80％）としながら、流量制御の主体を
押込ファンの回転数制御によりで実行できるため、圧力
損失を最少にした省エネ操業を容易に実現することがで
きる。Furthermore, the operation of the vane or damper is made temporary, and the control loop that always maintains the appropriate opening allows the opening of the vane or damper to be controlled at an appropriate opening (70-80%). However, since the main body of flow rate control can be executed by controlling the rotation speed of the pushing fan, it is possible to easily realize energy-saving operation with a minimum pressure loss.
第１図は本発明の実施例を示す構成図、第２図はその動
作説明図、第３図は従来技術の一例を示す構成図であ
る。 １……空気流量信号源、２……開平演算器、３……第１
関数演算手段、４……除算器、５……酸素濃度信号源、
６……第１調節計、７……ハイセレクタ、８……ボイラ
マスタ信号源、９……全燃料信号源、10……バイアス設
定器、11……ミニマムフロー設定器、12,17……手動／
自動操作器、13……電流／空気圧変換器、14……ベーン
又はダンパー、15……主蒸気流量信号源、16……第２関
数演算手段、18……回転数制御装置、19……第２調節
計、20……上下限リミター、21……加算器、22……第３
関数演算手段、23……変化率リミターFIG. 1 is a configuration diagram showing an embodiment of the present invention, FIG. 2 is an operation explanatory diagram thereof, and FIG. 3 is a configuration diagram showing an example of a conventional technique. 1 ... Air flow rate signal source, 2 ... Square root calculator, 3 ... First
Function calculating means, 4 ... Divider, 5 ... Oxygen concentration signal source,
6 ... First controller, 7 ... High selector, 8 ... Boiler master signal source, 9 ... All fuel signal source, 10 ... Bias setter, 11 ... Minimum flow setter, 12, 17 ... Manual /
Automatic operator, 13 ... Current / pneumatic pressure converter, 14 ... Vane or damper, 15 ... Main steam flow signal source, 16 ... Second function calculation means, 18 ... Rotation speed control device, 19 ... 2 Controller, 20 ... Upper and lower limit limiter, 21 ... Adder, 22 ... Third
Function calculation means, 23 ... Change rate limiter
Claims (1)
第１関数演算手段の出力値とボイラーマスター信号との
偏差を制御演算する第１調節計の操作出力で空気管路の
ベーン又はダンパー開度を調節すると共に、主蒸気流量
信号を押込ファンの回転数に変換する第２関数演算手段
の出力に基づく操作出力により空気管路の押込ファンの
回転数を変更する燃焼空気流量制御装置において、上記
第１調節計の操作出力と上記ベーン又はダンパー開度の
適正開度設定値との偏差を制御演算した操作出力を上記
第２演算出力値に加算する第２調節計と、上記加算出力
に基づいて上記第１調節計の比例帯を変更するための第
３関数演算手段とを具備した燃焼空気流量制御装置。Claim: What is claimed is: 1. A vane or damper for an air conduit provided by an operation output of a first controller for controlling and calculating a deviation between an output value of a first function calculating means for converting a measured value of an air flow rate into a fuel base and a boiler master signal. In a combustion air flow rate control device for adjusting the opening degree and changing the rotation speed of a pushing fan in an air line by an operation output based on an output of a second function calculating means for converting a main steam flow rate signal into a rotation speed of a pushing fan. A second controller for adding an operation output obtained by control calculation of a deviation between the operation output of the first controller and an appropriate opening setting value of the vane or damper opening to the second operation output value; and the addition output. And a third function calculating means for changing the proportional band of the first controller based on the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62005479A JPH083365B2 (en) | 1987-01-13 | 1987-01-13 | Combustion air flow controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62005479A JPH083365B2 (en) | 1987-01-13 | 1987-01-13 | Combustion air flow controller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63172821A JPS63172821A (en) | 1988-07-16 |
| JPH083365B2 true JPH083365B2 (en) | 1996-01-17 |
Family
ID=11612381
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62005479A Expired - Lifetime JPH083365B2 (en) | 1987-01-13 | 1987-01-13 | Combustion air flow controller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH083365B2 (en) |
-
1987
- 1987-01-13 JP JP62005479A patent/JPH083365B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63172821A (en) | 1988-07-16 |
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