JPS622202B2 - - Google Patents
Info
- Publication number
- JPS622202B2 JPS622202B2 JP54098724A JP9872479A JPS622202B2 JP S622202 B2 JPS622202 B2 JP S622202B2 JP 54098724 A JP54098724 A JP 54098724A JP 9872479 A JP9872479 A JP 9872479A JP S622202 B2 JPS622202 B2 JP S622202B2
- Authority
- JP
- Japan
- Prior art keywords
- main steam
- steam temperature
- value
- boiler
- fuel
- 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
- 239000000446 fuel Substances 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Landscapes
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Description
【発明の詳細な説明】
本発明はボイラ・タービンプラントの主蒸気温
度制御方式に係り、特に大幅かつ高速の負荷追従
性を要求されるボイラの主蒸気温度制御方式に関
する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a main steam temperature control system for a boiler/turbine plant, and particularly to a main steam temperature control system for a boiler that requires a large and high-speed load followability.
従来、ボイラの主蒸気温度制御は、第１図に示
すように燃料指令計算部FG1で負荷指令ＬDに対
応した燃料指令Ｆを計算しこの指令によつて先行
的に比例積分器PI2を介して燃料調節弁FCVを制
御する回路とこの先行制御によつて生ずる主蒸気
温度Ｔと設定値ＴSとの偏差より比例積分器PI1に
よつて燃料補正量ΔＦを計算し温度制御の為の燃
料補正をする回路より構成される。しかるにこの
ような従来方式によると元来燃料操作してから主
蒸気温度の変化が表われるまでに数分以上の遅れ
があるため特に大幅かつ急速な負荷変動指令が与
えられた場合には第２図に示すように主蒸気温度
は設定値との間に大きな偏差を生ずる。この偏差
（特にプラス側の偏差）が大きいと主機の材料強
度を低下させる恐れがある。 Conventionally, the main steam temperature control of a boiler is performed by calculating a fuel command F corresponding to a load command L D in a fuel command calculation unit FG 1 as shown in FIG . The fuel correction amount ΔF is calculated by the proportional integrator PI 1 from the deviation between the main steam temperature T and the set value T S caused by this preliminary control and the circuit that controls the fuel control valve FCV via the circuit. It consists of a circuit that corrects the fuel for this purpose. However, with this conventional method, there is a delay of several minutes or more between when the fuel is operated and when a change in main steam temperature appears, so especially when a large and rapid load change command is given, the second As shown in the figure, the main steam temperature has a large deviation from the set value. If this deviation (especially the deviation on the positive side) is large, there is a risk that the material strength of the main engine will be reduced.
本発明の目的は、従来方式の欠点をなくし、大
幅かつ急速な負荷変動時にも主蒸気温度変動幅を
小さく抑えることのできる主蒸気温度制御方式を
提供するにある。 SUMMARY OF THE INVENTION An object of the present invention is to provide a main steam temperature control method that eliminates the drawbacks of conventional methods and can keep main steam temperature fluctuation range small even during large and rapid load changes.
本発明は主蒸気温度の履歴に基づき、将来（予
測時間と呼ぶ）における設定値と主蒸気温度との
偏差を計算し、その偏差に相当した燃料量を先行
的に制御すること、ボイラの状態によつて変化す
る燃料量変化に対する主蒸気温度変化のむだ時間
と時定数を計算し、その合計で表わされる遅れ時
間に応じて予測時間を変えることを特徴とする。 The present invention calculates the deviation between the set value and the main steam temperature in the future (referred to as the predicted time) based on the history of the main steam temperature, and proactively controls the amount of fuel corresponding to the deviation, and the boiler condition. The method is characterized in that the dead time and time constant of the change in main steam temperature with respect to the change in fuel amount, which varies depending on the amount of fuel, are calculated, and the predicted time is changed in accordance with the delay time represented by the sum of the dead time and time constant.
第３図に本発明の実施例を示す。主蒸気温度予
測部TPCは主蒸気温度Ｔの履歴より主蒸気温度
の時定数ＴBに比例した時間ＴP（以後予測時間と
呼ぶ）後の主蒸気温度Ｔf（以後予測温度と呼
ぶ）を計算する部分である。主蒸気温度時定数決
定部FG2は負荷レベルをパラメータとして主蒸気
温度の応答のむだ時間と時定数の合計でなる遅れ
時間を求める手段で、この実施例では主蒸気によ
り駆動されるタービンの第１段後圧力の検出値P1
から予じめ固定した関数を用いて遅れ時間ＴBを
発生する。主蒸気温度予測部TPCでの予測時間
ＴPはFG2で算出した主蒸気温度遅れ時間ＴBに基
づいて
ＴP＝α・ＴB
の値で予測を行なう。ここでαは主蒸気温度制御
特性が良くなる最適な値に設定される値で、
SETはこのαの値を設定するための設定器であ
る。このαの値は通常はほぼ１に等しく、この値
は設定し直すことによりボイラ特性の経年変化な
どが吸収できる。 FIG. 3 shows an embodiment of the present invention. The main steam temperature prediction unit TPC calculates the main steam temperature T f (hereinafter referred to as predicted temperature) after a time T P (hereinafter referred to as predicted time) proportional to the time constant T B of main steam temperature based on the history of main steam temperature T. This is the calculation part. The main steam temperature time constant determination unit FG 2 is a means for determining the delay time, which is the sum of the dead time of the main steam temperature response and the time constant, using the load level as a parameter. Detected value of pressure after 1st stage P 1
A delay time T B is generated using a function fixed in advance from . The prediction time T P in the main steam temperature prediction unit TPC is predicted based on the main steam temperature delay time T B calculated in FG 2 as a value of T P =α·T B. Here, α is the value set to the optimal value that improves the main steam temperature control characteristics,
SET is a setting device for setting the value of α. The value of α is usually approximately equal to 1, and by setting this value again, aging changes in boiler characteristics can be absorbed.
比例積分器PI1ではこのような予測時間ＴPによ
り予測した予測温度と予測時間ＴP後の目標値ＴS
Ｐとの偏差、即ちＴP後の主蒸気温度偏差予測値に
基づき比例積分演算により燃料補正量ΔＦを算出
し、以後は従来と同様な制御系により燃料の制御
が行なわれる。 The proportional integrator PI 1 calculates the predicted temperature predicted by the predicted time T P and the target value T S after the predicted time T P.
The fuel correction amount ΔF is calculated by proportional-integral calculation based on the deviation from P , that is, the predicted value of main steam temperature deviation after T P , and thereafter the fuel is controlled by the same control system as the conventional one.
即ち、燃料指令計算部FG1では予じめ固定した
関数を用いボイラに対する負荷指令ＬDから燃料
指令Ｆが算出され、この値と上記のように求めた
燃料補正量ΔＦは加算され、補正された燃料指令
ＦTとなる。比例積分器PI2では燃料量の検出値
FFとこのＦTとの偏差に基づいて比例積分演算に
より燃料調節弁FCVの開度制御信号FCを算出
し、これによりボイラへ投入する燃料量が制御さ
れる。 That is, in the fuel command calculation unit FG 1 , the fuel command F is calculated from the load command L D for the boiler using a pre-fixed function, and this value and the fuel correction amount ΔF obtained as above are added and corrected. The fuel command is F T. In the proportional integrator PI 2 , the detected value of the fuel quantity
Based on the deviation between FF and this F T , an opening control signal FC of the fuel control valve FCV is calculated by proportional-integral calculation, thereby controlling the amount of fuel injected into the boiler.
主蒸気温度予測部TPCにおける予測温度Ｔfの
計算実施例を第４図を用いて説明する。第４図に
おいてＴi，Ｔi-1，Ｔi-2，Ｔi-3はそれぞれ時刻ｔ
i，ｔi-1，ｔi-2，ｔi-3における主蒸気温度を表わ
す。予測温度Ｔfは、これら４点の値を用いて最
小２乗法に基づいて次式より求める。 An example of calculation of the predicted temperature T f in the main steam temperature prediction unit TPC will be explained using FIG. 4. In FIG. 4, T i , T i-1 , T i-2 , and T i-3 are each at time t
It represents the main steam temperature at i , t i-1 , t i-2 , t i-3 . The predicted temperature T f is calculated from the following equation based on the least squares method using the values at these four points.
Ｔf＝Ｔi＋ＴP×Ｒa ……(1)
Ｒa＝３Ｔｉ＋Ｔｉ−１−Ｔｉ−２−３Ｔｉ−３／１０
×ΔｔＳ……(2)
ここでΔｔSはサンプリング周期を示す。T f =T i +T P ×R a ...(1) R a =3T i +T i-1 -T i-2 -3T i-3 /10
×Δt S ...(2) Here, Δt S indicates the sampling period.
本発明によるシミユレーシヨン結果を第５図に
示す。この図で実線は本発明の実施例による制御
特性、点線は第１図の従来例による制御特性を示
す。この図より主蒸気温度の設定値からの変動
は、従来方式に比較して約半分となり制御性が著
しく改善されていることが伴る。 The simulation results according to the present invention are shown in FIG. In this figure, the solid line shows the control characteristics according to the embodiment of the present invention, and the dotted line shows the control characteristics according to the conventional example shown in FIG. This figure shows that the fluctuation of the main steam temperature from the set value is about half that of the conventional method, and controllability is significantly improved.
本発明によれば、大幅かつ急速な負荷変動に際
しても主蒸気温度変動幅を小さく抑えることがで
きる。 According to the present invention, the width of main steam temperature fluctuation can be suppressed to a small extent even in the event of large and rapid load fluctuations.
第１図は従来の制御方式の構成図、第２図は従
来の制御方式による燃料操作量に対する主蒸気温
度の応答特性図、第３図は本発明の実施例を示す
ブロツク図、第４図は第３図における予測演算の
説明図、第５図は本発明による制御改善効果を示
すシミユレーシヨン結果を示す図である。
TPC……主蒸気温度予測部、FG2……主蒸気温
度遅れ時間計算部、FG1……燃料指令計算部、
PI1，PI2……比較積分器、FCV……燃料調節弁。
Fig. 1 is a block diagram of a conventional control system, Fig. 2 is a response characteristic of main steam temperature to fuel operation amount according to a conventional control system, Fig. 3 is a block diagram showing an embodiment of the present invention, and Fig. 4 is an explanatory diagram of the prediction calculation in FIG. 3, and FIG. 5 is a diagram showing simulation results showing the control improvement effect according to the present invention. TPC...Main steam temperature prediction section, FG 2 ...Main steam temperature delay time calculation section, FG 1 ...Fuel command calculation section,
PI 1 , PI 2 ... Comparison integrator, FCV... Fuel control valve.
Claims (1)
手段と、該ボイラの発する主蒸気の目標値からの
温度偏差に応じて前記燃料指令を補正する手段
と、補正された燃料指令に基づきボイラへ供給す
る燃料量を制御する手段を備えたものにおいて、
前記ボイラの負荷レベルの検出値から予め定めた
関数により主蒸気温度変化の遅れ時間を算出する
手段と、主蒸気温度検出値の過去の履歴から前記
遅れ時間後の主蒸気温度予測値を算出する予測手
段とを備え、前記遅れ時間後の主蒸気温度目標値
と前記主蒸気温度予測値との偏差に基づいて前記
燃料指令を補正することを特徴とする主蒸気温度
制御方式。 ２ 特許請求の範囲第１項において負荷レベルの
検出値として前記主蒸気により駆動されるタービ
ンの第１段、検出値を用いることを特徴とする主
蒸気温度制御方式。 ３ 特許請求の範囲第１項において、前記予測手
段は前記遅れ時間に設定された係数を掛けた時間
後の主蒸気温度予測値を算出することを特徴とす
る主蒸気温度制御方式。[Scope of Claims] 1. Means for issuing a fuel command according to a load command of a boiler, means for correcting the fuel command according to a temperature deviation from a target value of main steam emitted by the boiler, and a means for issuing a fuel command according to a target value of main steam emitted by the boiler, In those equipped with means for controlling the amount of fuel supplied to the boiler based on instructions,
Means for calculating a delay time of main steam temperature change using a predetermined function from a detected value of the load level of the boiler, and calculating a predicted main steam temperature value after the delay time from a past history of the detected main steam temperature value. A main steam temperature control method, comprising: a prediction means, and the fuel command is corrected based on a deviation between the main steam temperature target value after the delay time and the main steam temperature predicted value. 2. A main steam temperature control method according to claim 1, characterized in that a detected value of the first stage of the turbine driven by the main steam is used as the detected value of the load level. 3. The main steam temperature control method according to claim 1, wherein the prediction means calculates a predicted main steam temperature value after a time period obtained by multiplying the delay time by a set coefficient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9872479A JPS5623607A (en) | 1979-08-03 | 1979-08-03 | Controlling system for temperature of main steam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9872479A JPS5623607A (en) | 1979-08-03 | 1979-08-03 | Controlling system for temperature of main steam |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5623607A JPS5623607A (en) | 1981-03-06 |
| JPS622202B2 true JPS622202B2 (en) | 1987-01-19 |
Family
ID=14227459
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9872479A Granted JPS5623607A (en) | 1979-08-03 | 1979-08-03 | Controlling system for temperature of main steam |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5623607A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63299712A (en) * | 1987-05-28 | 1988-12-07 | Matsushita Electric Ind Co Ltd | Surge noise absorber |
| JPS63299718A (en) * | 1987-05-28 | 1988-12-07 | Matsushita Electric Ind Co Ltd | Surge noise absorber |
| JPS63299711A (en) * | 1987-05-28 | 1988-12-07 | Matsushita Electric Ind Co Ltd | Surge noise absorber |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS559601A (en) * | 1973-07-06 | 1980-01-23 | Asahi Chiba Kk | Preparation of epoxy resin |
-
1979
- 1979-08-03 JP JP9872479A patent/JPS5623607A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS559601A (en) * | 1973-07-06 | 1980-01-23 | Asahi Chiba Kk | Preparation of epoxy resin |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63299712A (en) * | 1987-05-28 | 1988-12-07 | Matsushita Electric Ind Co Ltd | Surge noise absorber |
| JPS63299718A (en) * | 1987-05-28 | 1988-12-07 | Matsushita Electric Ind Co Ltd | Surge noise absorber |
| JPS63299711A (en) * | 1987-05-28 | 1988-12-07 | Matsushita Electric Ind Co Ltd | Surge noise absorber |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5623607A (en) | 1981-03-06 |
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