JPH0245770B2 - - Google Patents
Info
- Publication number
- JPH0245770B2 JPH0245770B2 JP58160470A JP16047083A JPH0245770B2 JP H0245770 B2 JPH0245770 B2 JP H0245770B2 JP 58160470 A JP58160470 A JP 58160470A JP 16047083 A JP16047083 A JP 16047083A JP H0245770 B2 JPH0245770 B2 JP H0245770B2
- Authority
- JP
- Japan
- Prior art keywords
- flow rate
- air flow
- signal
- value
- detector
- 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
- 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
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】
〔発明の利用分野〕
本発明は、火力プラントの自動制御装置に係
り、特に、O2分析計からの信号を取り込み、空
燃比制御を行なうプラントに好適な火力プラント
の酸素制御装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an automatic control device for a thermal power plant, and in particular to an automatic control device for a thermal power plant that is suitable for a plant that takes in a signal from an O 2 analyzer and controls the air-fuel ratio. Relating to an oxygen control device.
火力プラントでは、原子力プラントがベースロ
ード運用となるに伴い、中間負荷運用へ移行して
いる。一方、省エネや公害対策を手段としてO2
制御を行なうプラントが多くなつている。ところ
が、O2分析計にはO2値検出遅れが３分近くある
ので、火力プラントが中間負荷運用するに伴い、
負荷変動運転することが多くなつた近年では、負
荷変化中でも安定してO2制御を行なうことが求
められている。
Thermal power plants are transitioning to intermediate load operation as nuclear power plants shift to base load operation. On the other hand, O 2
More and more plants are being controlled. However, since the O 2 analyzer has a delay of nearly 3 minutes in detecting the O 2 value, as thermal power plants operate under intermediate loads,
In recent years, as load fluctuation operation has become more common, there is a demand for stable O 2 control even during load changes.
以下、従来の構成及び動作を説明する。第１図
に火力プラントの概略図を示す。 The conventional configuration and operation will be explained below. Figure 1 shows a schematic diagram of a thermal power plant.
ボイラ自動制御装置１は、中央制御室及び負荷
の要求に見合つて燃料流量調整弁１０、押込通風
機入口ダンパ８、給水流量調整弁１２、主蒸気加
減弁１４を制御し、これに応じた空気と燃料をバ
ーナ５で燃焼させ、定格出力、温度の蒸気をター
ビン３へ送る。２は火炉、４はドラム、６は空気
流量検出器、７は押込通風機、９は燃料流量検出
器、１１は給水流量検出器、１３は主蒸気流量検
出器、１５は節炭器出口排ガスO2値検出器であ
る。 The boiler automatic control device 1 controls the fuel flow rate adjustment valve 10, the forced draft fan inlet damper 8, the feed water flow rate adjustment valve 12, and the main steam control valve 14 in accordance with the demands of the central control room and the load, and controls the air flow rate according to this. The burner 5 burns the fuel and sends steam at the rated output and temperature to the turbine 3. 2 is a furnace, 4 is a drum, 6 is an air flow rate detector, 7 is a forced draft fan, 9 is a fuel flow rate detector, 11 is a feed water flow rate detector, 13 is a main steam flow rate detector, 15 is an exhaust gas at the exit of the economizer. O is a binary detector.
第２図に従来のO2制御方式による制御回路図
を示す。主蒸気流量検出器１３より検出された主
蒸気流量をベース信号として関数発生器１６によ
りO2値設定プログラム信号とし、節炭器出口排
ガスO2値検出器１５より検出されたO2値とを加
算器１７で演算して偏差をとり、この偏差を比例
積分器１８により比例積分て空気流量の補正信号
２７とする。一方、空気流量検出器６により検出
された信号を関数発生器１９にてカロリベース空
気流量（空気流量信号）２８とする。これは、燃
料の種類により発生熱量すなわちカロリが異なる
ため、実際の空気流量を使用している燃料に見合
つたカロリベースの空気流量とするものである。
このカロリベース空気流量２８を空気流量補正信
号２７で乗算器２０で補正し、最適空気流量信号
２９とする。この信号２９と、関数発生器２１に
より主蒸気流量から算出したカロリベース空気流
量信号とを加算器２２で演算して偏差をとり、こ
の偏差を比例積分器２３で比例積分して押込通風
機入口ダンパを動作させ、空気流量を調整する。
この従来方式では、負荷変化中の節炭器出口排ガ
スO2値検出器（O2分析計）の応答遅れは全く考
慮されておらず、加算器１７は常にO2値検出器
（O2分析計）応答遅れ分を含んだ約３分前のO2値
偏差を算出して、これにより空気流量の補正を行
なつている。なお、図中ｂ，ｃ，ｄはそれぞれａ
中の１６，２１，１９の特性図である。 Figure 2 shows a control circuit diagram using the conventional O 2 control method. Using the main steam flow rate detected by the main steam flow rate detector 13 as a base signal, the function generator 16 makes an O 2 value setting program signal, and the O 2 value detected by the economizer outlet exhaust gas O 2 value detector 15 is used as a base signal. An adder 17 calculates a deviation, and a proportional integrator 18 proportionally integrates this deviation to obtain a correction signal 27 for the air flow rate. On the other hand, the signal detected by the air flow rate detector 6 is converted into a calorie-based air flow rate (air flow rate signal) 28 by a function generator 19 . This is because the amount of heat generated, that is, calories, differs depending on the type of fuel, so the actual air flow rate is set to a calorie-based air flow rate commensurate with the fuel being used.
This calorie base air flow rate 28 is corrected by a multiplier 20 using an air flow rate correction signal 27 to obtain an optimum air flow rate signal 29. This signal 29 and the calorie-based air flow rate signal calculated from the main steam flow rate by the function generator 21 are calculated by an adder 22 to obtain a deviation, and this deviation is proportionally integrated by a proportional integrator 23 at the forced draft fan inlet. Operate the damper and adjust the air flow rate.
In this conventional method, the response delay of the exhaust gas O 2 value detector (O 2 analyzer) at the outlet of the economizer during load changes is not taken into account at all, and the adder 17 always detects the O 2 value detector (O 2 analyzer). The O 2 value deviation approximately 3 minutes ago, including the response delay, is calculated and the air flow rate is corrected based on this. In addition, b, c, d in the figure are a
It is a characteristic diagram of Nos. 16, 21, and 19 among them.
本発明の目的は、火力プラントで主蒸気流量に
よりO2値設定プログラム信号を作成し、この信
号で空気流量を補正し、負荷変動中でもO2分析
計の応答遅れを補償した最適な空撚比とする火力
プラントの酸素制御装置を提供するにある。
The purpose of the present invention is to create an O 2 value setting program signal based on the main steam flow rate in a thermal power plant, correct the air flow rate using this signal, and create an optimal air twist ratio that compensates for the response delay of the O 2 analyzer even during load fluctuations. To provide oxygen control equipment for thermal power plants.
本発明の要点は負荷変化中でも空撚比を最適に
制御できるように、主蒸気流量によるO2値設定
プログラム信号で空気流量を直接補正する制御装
置にある。すなわち、本発明に係る火力プラント
の酸素制御装置は、主蒸気流量検出器からの出力
で定めるO2値設定プログラム信号と節炭器出口
排ガスO2値検出器からの出力で定めるO2値との
偏差によつて得られる補正信号で、空気流量検出
器からの空気流量信号を補正して空気流量を制御
する火力プラントの酸素制御装置において、O2
値設定プログラム信号で空気流量信号を補正する
乗算器を設け、乗算器の出力信号を補正信号で補
正し負荷変化に応じて空気流量を制御するように
構成されている。
The key point of the present invention is a control device that directly corrects the air flow rate using an O 2 value setting program signal based on the main steam flow rate so that the air twist ratio can be optimally controlled even when the load changes. That is, the oxygen control device for a thermal power plant according to the present invention has an O 2 value setting program signal determined by the output from the main steam flow rate detector and an O 2 value determined by the output from the economizer outlet exhaust gas O 2 value detector. This is a correction signal obtained by the deviation of the O 2
A multiplier that corrects the air flow signal using a value setting program signal is provided, and the output signal of the multiplier is corrected using the correction signal to control the air flow rate in response to load changes.
〔発明の実施例〕
第３図に本発明を実施したO2制御の回路図を
示す。第２図と異なる点は、主蒸気流量を関数発
生器１６によりO2値設定プログラムとした信号
で乗算器２４により空気流量信号を補正している
点である。本方式により、従来方式では、関数発
生器１９で一律に設定していたカロリベース空気
流量を、主蒸気流量変化とともにプラント状態に
合致したカロリベース空気流量に補正することが
でき、O2分析計の応答遅れが補償できる。乗算
器２４の演算は次式(1)で与えられる。[Embodiment of the Invention] FIG. 3 shows a circuit diagram of O 2 control in which the present invention is implemented. The difference from FIG. 2 is that the air flow rate signal is corrected by the multiplier 24 using a signal obtained by converting the main steam flow rate into an O 2 value setting program by the function generator 16. With this method, the calorie-based air flow rate, which was uniformly set by the function generator 19 in the conventional method, can be corrected to the calorie-based air flow rate that matches the plant condition as the main steam flow rate changes, and the O 2 analyzer response delay can be compensated for. The operation of the multiplier 24 is given by the following equation (1).
Ｙ＝（GA＋GB・X2）・X1 (1)
ただし、Ｙはカロリベース空気流量、X1は空
気流量、X2はO2値設定プログラム値、GAは乗算
器入力ゲイン、GBは乗算器補正入力ゲインであ
る。さらに、(1)式の特性を第３図ｂで説明するた
め、乗算器２４のトータルゲインＲを、
Ｒ＝GA＋GB・X2 (2)
とすると、このトータルゲインＲの変化、すなわ
ちO2値設定プログラム信号X2の変化により、乗
算器２４の出力値Ｙすなわち空気流量の値が変化
することが判る。なお、図中２５はアナログメモ
リ、２６はアナログ信号切換器である。 Y=(GA+GB・X 2 )・X 1 (1) Where, Y is calorie base air flow rate, X 1 is air flow rate, X 2 is O2 value setting program value, GA is multiplier input gain, GB is multiplier This is the correction input gain. Furthermore, in order to explain the characteristics of equation (1) with reference to FIG. 3b , if the total gain R of the multiplier 24 is R = GA + GB · It can be seen that a change in the set program signal X 2 causes a change in the output value Y of the multiplier 24, that is, the value of the air flow rate. In the figure, 25 is an analog memory, and 26 is an analog signal switch.
第４図ないし第６図に従来と本発明の場合の
各々の挙動を示す。第４図は主蒸気流量の変化、
第５図では、主蒸気流量の変動による節炭器出口
排ガスO2値の実測値Ｍと、主蒸気流量によるO2
値設定プログラム信号値Ｐとで斜線部の遅れが生
じることをそれぞれ示す。第６図は、O2分析計
の応答遅れに伴い、空気流量指令値に、従来Ａと
本発明Ｂとで斜線のような相違が生じることを示
す。すなわち、従来の制御方式では、負荷変動中
はO2分析計の応答遅れの分だけ空気流量補正が
遅れることとなり、最適空気量に比べて負荷上昇
中は空気量が多目に、負荷下降中は少な目とな
る。本発明による制御装置によれば、従来の不具
合を解消し、負荷変動中でも最適な空気量を制御
できる。 FIGS. 4 to 6 show respective behaviors in the conventional case and the present invention. Figure 4 shows changes in main steam flow rate,
Figure 5 shows the measured value M of the exhaust gas O 2 value at the exit of the economizer due to fluctuations in the main steam flow rate, and the O 2 value due to the main steam flow rate.
The shaded areas indicate that a delay occurs with the value setting program signal value P. FIG. 6 shows that, due to the response delay of the O 2 analyzer, there is a difference in the air flow rate command value between Conventional A and Invention B, as shown by diagonal lines. In other words, with conventional control methods, air flow rate correction is delayed by the response delay of the O 2 analyzer during load fluctuations, and compared to the optimal air amount, the air amount is larger when the load is increasing, and when the load is decreasing. will be less. According to the control device according to the present invention, conventional problems can be solved and the optimum amount of air can be controlled even during load fluctuations.
本発明によれば、火力プラントの酸素制御装置
にO2値設定プログラム信号で空気流量信号を補
正する乗算器を設けたため、O2分析計の応答遅
れが補償されて空気流量補正の遅れがなくなり、
負荷変動中でも最適な空燃費が運用でき、プラン
トの効率が向上する。
According to the present invention, the oxygen control device of a thermal power plant is provided with a multiplier that corrects the air flow signal using the O 2 value setting program signal, thereby compensating for the response delay of the O 2 analyzer and eliminating the delay in air flow correction. ,
Optimal air and fuel efficiency can be achieved even during load fluctuations, improving plant efficiency.
第１図は火力プラントの概略図、第２図は従来
のO2制御回路図、第３図は本発明による制御回
路図、第４図は主蒸気流量の挙動図、第５図は負
荷変化中の節炭器出口排ガスO2値の実測値とプ
ログラム値の挙動図、第６図は負荷変化中の空気
流量指令信号の従来と、本発明の制御挙動図であ
る。
２５……アナログメモリ、２６……アナログ信
号切替器。
Figure 1 is a schematic diagram of a thermal power plant, Figure 2 is a conventional O 2 control circuit diagram, Figure 3 is a control circuit diagram according to the present invention, Figure 4 is a behavior diagram of main steam flow rate, and Figure 5 is a load change diagram. FIG. 6 is a diagram showing the behavior of the measured value and program value of the exhaust gas O 2 value at the exit of the economizer, and FIG. 25... Analog memory, 26... Analog signal switch.
Claims (1)
設定プログラム信号と節炭器出口排ガスO2値検
出器からの出力で定めるO2値との偏差によつて
得られる補正信号で、空気流量検出器からの空気
流量信号を補正して空気流量を制御する火力プラ
ントの酸素制御装置において、前記O2値設定プ
ログラム信号で前記空気流量信号を補正する乗算
器を設け、該乗算器の出力信号を前記補正信号で
補正し負荷変化に応じて前記空気流量を制御する
ことを特徴とする火力プラントの酸素制御装置。1 A correction signal obtained by the deviation between the O 2 value setting program signal determined by the output from the main steam flow rate detector and the O 2 value determined by the output from the exhaust gas O 2 value detector at the exit of the economizer. In an oxygen control device for a thermal power plant that corrects an air flow signal from a detector to control air flow, a multiplier that corrects the air flow signal with the O 2 value setting program signal is provided, and the output signal of the multiplier is An oxygen control device for a thermal power plant, characterized in that the air flow rate is controlled according to a load change by correcting the air flow rate using the correction signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16047083A JPS6053718A (en) | 1983-09-02 | 1983-09-02 | Oxygen control device for thermal plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16047083A JPS6053718A (en) | 1983-09-02 | 1983-09-02 | Oxygen control device for thermal plant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6053718A JPS6053718A (en) | 1985-03-27 |
| JPH0245770B2 true JPH0245770B2 (en) | 1990-10-11 |
Family
ID=15715641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16047083A Granted JPS6053718A (en) | 1983-09-02 | 1983-09-02 | Oxygen control device for thermal plant |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6053718A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6946060B2 (en) * | 2017-06-01 | 2021-10-06 | 三菱パワー株式会社 | Control device for coal-fired boiler |
| JP7316234B2 (en) * | 2020-02-26 | 2023-07-27 | 三菱重工業株式会社 | Control device, control method and program |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5726322A (en) * | 1980-07-22 | 1982-02-12 | Toshiba Corp | Controlling system for concentration of oxygen in exhaust gas |
| JPS57174618A (en) * | 1981-04-22 | 1982-10-27 | Fuji Electric Co Ltd | Control system for variable spped fan in combustion equipment |
-
1983
- 1983-09-02 JP JP16047083A patent/JPS6053718A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6053718A (en) | 1985-03-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4188781A (en) | Non-linear dual mode regulator circuit | |
| US4550565A (en) | Gas turbine control systems | |
| US11822316B2 (en) | Coal-air synchronous dynamic coordinated control method for coal-fired unit | |
| US4064699A (en) | Boiler control providing improved operation with fuels having variable heating values | |
| JPS6033971B2 (en) | Control device for power generation equipment | |
| JP3178055B2 (en) | Control device for gas turbine combustor and gas turbine | |
| CA1042089A (en) | Boiler control having a heating value computer and providing improved operation with fuels having variable heating values | |
| JPH0245770B2 (en) | ||
| JPS6039842B2 (en) | Boiler/turbine coordinated voltage transformation operation method | |
| JP2887999B2 (en) | Fuel control device for auxiliary boiler in multiple boiler facilities | |
| JPS6324359Y2 (en) | ||
| JPS6350601B2 (en) | ||
| JPS61175406A (en) | Controller for temperature of reheated steam of boiler | |
| JPH0263121B2 (en) | ||
| JPS63294416A (en) | Automatic control system of boiler | |
| JP2521709B2 (en) | Steam temperature controller | |
| JPH0743085B2 (en) | Boiler main steam temperature controller | |
| JP3769064B2 (en) | Boiler fuel control method and apparatus for exhaust recombustion combined cycle | |
| JPH0315088B2 (en) | ||
| JPS63687B2 (en) | ||
| JPH02154902A (en) | Steam temperature control method at plant startup | |
| JP2006064188A (en) | Method and device for controlling reheater steam temperature for boiler | |
| JPH0321808B2 (en) | ||
| JPS61211603A (en) | Automatic controller for thermal power plant | |
| JPS59229104A (en) | Method of controlling temperature of steam of boiler |