JPS6334365B2 - - Google Patents
Info
- Publication number
- JPS6334365B2 JPS6334365B2 JP18446281A JP18446281A JPS6334365B2 JP S6334365 B2 JPS6334365 B2 JP S6334365B2 JP 18446281 A JP18446281 A JP 18446281A JP 18446281 A JP18446281 A JP 18446281A JP S6334365 B2 JPS6334365 B2 JP S6334365B2
- Authority
- JP
- Japan
- Prior art keywords
- coal
- speed
- coal feeder
- signal
- change rate
- 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
- 239000003245 coal Substances 0.000 claims description 88
- 230000008859 change Effects 0.000 claims description 25
- 239000000446 fuel Substances 0.000 claims description 19
- 238000002485 combustion reaction Methods 0.000 claims description 5
- 238000010248 power generation Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 230000007423 decrease Effects 0.000 description 6
- 230000006870 function Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
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)
- Control Of Combustion (AREA)
- Feeding And Controlling Fuel (AREA)
Description
【発明の詳細な説明】
(a) 発明の分野
本発明は、火力発電所におけるボイラ給炭機の
制御装置に関する。DETAILED DESCRIPTION OF THE INVENTION (a) Field of the Invention The present invention relates to a control device for a boiler coal feeder in a thermal power plant.
(b) 技術背景
周知のように石炭火力発電所は第１図に示すよ
うになつている。すなわち、給水ポンプ１にてボ
イラ２に給水FWFを供給し、ボイラ２内の石炭
バーナ３でこれを過熱し、蒸気を発生させて蒸気
管４および蒸気加減弁５を通つてタービン６を回
転させ、発電機７より電力MWを発生させるもの
である。そして、発生電力量の増減はプラント統
括制御装置８にて蒸気加減弁５を制御することに
より行なわれる。このプラント統括制御装置８は
目標発生電力量を得るに必要な給水量および燃料
量を算出し、給水ポンプ１および給炭機Ａに指令
を出す。給水FWFおよび発生電力MWを帰還し
ているのはこのためであり、また蒸気の圧力Ｐお
よびその温度も帰還してタービン６に必要な条件
の蒸気を発生させ、蒸気量を蒸気加減弁５で制御
して目標電力量に到達させるようにしている。(b) Technical background As is well known, a coal-fired power plant is structured as shown in Figure 1. That is, feed water FWF is supplied to the boiler 2 by the feed water pump 1, and is superheated by the coal burner 3 in the boiler 2 to generate steam, which passes through the steam pipe 4 and the steam control valve 5 and rotates the turbine 6. , the generator 7 generates electric power MW. The amount of generated power is increased or decreased by controlling the steam control valve 5 by the plant integrated control device 8. This plant general control device 8 calculates the amount of water supply and fuel necessary to obtain the target amount of generated power, and issues commands to the water supply pump 1 and the coal feeder A. This is why the feed water FWF and the generated power MW are returned, and the steam pressure P and its temperature are also returned to generate steam under the conditions required for the turbine 6, and the amount of steam is controlled by the steam control valve 5. It is controlled to reach the target amount of electricity.
ここで、ボイラ２内の各々の石炭バーナ３へは
粉砕機（ミル）Ｂにて粉状にされた燃料（石炭の
微粉）が送られる。給炭機Ａはこの粉砕機Ｂに石
炭を供給するものである。また石炭火力では石炭
がボイラ２に対する燃料として扱われるのである
から、発電所における全燃料Ｆは、ｎ台の給炭機
Ａおよびｎ台の粉砕機Ｂが設けられている場合は
Ｆ＝o
〓n=1
Fnで表わされる。 Here, fuel (fine coal powder) pulverized by a crusher (mill) B is sent to each coal burner 3 in the boiler 2 . Coal feeder A supplies coal to this crusher B. In addition, in coal-fired power plants, coal is treated as fuel for boiler 2, so the total fuel F in the power plant is F = o 〓 when n coal feeders A and n crushers B are installed. n=1 Represented by Fn.
ところで、プラント統括制御装置８が上述のよ
うな目標電力量に達するフイードバツク制御を自
動で行なえる範囲には制約があり、一般に発生電
力MWが定格最大出力の25％以上となつた場合と
定められている。そこでプラント統括制御装置８
が自動モードで給水FWFが燃料量Ｆを制御でき
る様態になるまでは、プラント統括制御装置８が
本来制御しなければならない各種操作を手動で行
なわなければならない。そして、その後に自動に
切換える必要がある。また、負荷がたとえ25％以
上あつても、給炭機Ａや粉砕機Ｂの起動、ウオー
ミングと初期燃料投入の操作は手動で行ない石炭
バーナ３が安定燃焼できる石炭供給のところまで
手動で燃料を増加又は減少することが必要であ
る。 By the way, there is a limit to the range in which the plant integrated control device 8 can automatically perform feedback control to reach the target power amount as described above, and is generally defined as when the generated power MW becomes 25% or more of the rated maximum output. ing. Therefore, the plant general control device 8
Until the water supply FWF is in automatic mode and is in a state where it can control the fuel amount F, various operations that should originally be controlled by the plant integrated control device 8 must be performed manually. Then, it is necessary to switch to automatic after that. In addition, even if the load is 25% or more, the startup, warming, and initial fuel injection of coal feeder A and crusher B are performed manually, and the fuel is manually fed until the coal supply reaches the point where coal burner 3 can stably burn the coal. It is necessary to increase or decrease.
しかるに、この手動での燃料の増加又は減少の
制御（この場合、手動とはプラント統括制御装置
８による自動制御外ということであり、計算機等
別の制御装置による制御も含んでいる。）はプラ
ント状態を加味せずに行なうと、負荷の変化と全
燃料流量（＝全給炭量）とのバランスがくずれそ
れを補うためにプラント統括制御装置８の自動モ
ードの給炭機Ａに対する指令が変動することにな
る。 However, this manual control of increase or decrease of fuel (in this case, manual means outside the automatic control by the plant integrated control device 8, and also includes control by another control device such as a computer) If this is done without considering the state, the balance between the load change and the total fuel flow rate (=total amount of coal fed) will be lost, and to compensate for this, the command to the coal feeder A in the automatic mode of the plant integrated control device 8 will vary. I will do it.
たとえば、ｎ台の給炭機Ａのうちｍ台が自動モ
ードで運転されている場合に、１台の給炭機Ai
を手動で追加起動する場合を考える。一般に自動
モードの各々の給炭機Ａに対する指令は粉砕機Ｂ
の過負荷及び給炭量下限制限のために、上限値及
び下限値が定められており、この制限値を逸脱す
ると増ブロツク又は減ブロツク動作によつて給炭
機速度制御がブロツクされる。また負荷の速化率
は起動モード負荷帯等により変化するが、手動モ
ードの給炭機Aiの起動の速度制御を一定レート
で行なつた場合、そのときの負荷変化率によつて
はプラント統括制御装置８の制御外の給炭機Ai
による給炭量の変動に応じて自動モードの給炭機
Ａに対する指令が変動する。この変動によつて
上・下限値にひつかかるような場合にはブロツク
動作が起こることになり好ましくない。 For example, if m of n coal feeders A are operated in automatic mode, one coal feeder Ai
Consider the case where you manually add and start . Generally, the command for each coal feeder A in automatic mode is the crusher B.
Upper and lower limit values are determined for overload and lower limit of coal feed amount, and if these limit values are exceeded, coal feeder speed control is blocked by increasing or decreasing block operation. In addition, the load speedup rate changes depending on the startup mode load band, etc., but if the startup speed of the coal feeder Ai in manual mode is controlled at a constant rate, depending on the load change rate at that time, the plant control Coal feeder Ai not controlled by control device 8
The command to coal feeder A in automatic mode changes in accordance with the change in the amount of coal fed. If the upper or lower limit values are approached due to this fluctuation, a blocking operation will occur, which is undesirable.
又負荷に対する燃料量指令と全給炭量との間に
偏差が出れば、空気流量指令や給水流量指令にも
影響を及ぼすことになり、プラントに外乱を与え
るような形になる。そのため、できるだけプラン
ト統括制御装置８の給炭機指令をかえないように
手動での燃料の増加減少を行なう必要がある。特
に給炭機の場合、給水制御のように台数変更時、
負荷を定値制御とはしないためもの制御には特に
注意する必要がある。 Furthermore, if there is a deviation between the fuel amount command for the load and the total coal feed amount, it will also affect the air flow rate command and the water supply flow rate command, causing disturbance to the plant. Therefore, it is necessary to manually increase or decrease the amount of fuel so as not to change the coal feeder command of the plant general control device 8 as much as possible. Especially in the case of coal feeders, when changing the number of coal feeders such as water supply control,
Since the load is not controlled at a constant value, special care must be taken when controlling the load.
(c) 発明の目的
本発明の目的はプラント通常運転中又は起動停
止中の石炭専焼時の給炭機台数増減時に、負荷変
化率に応じた燃焼量変化率（＝給炭量変化量）を
求め、これより給炭機速度変化率を演算して自動
除外の、給炭機の速度制御をこの負荷変化率に対
応した速度変化率をもとに行い、負荷変化に対応
する給炭量の増減を自動除外の給炭機によつてま
かなうことで、自動運転中の給炭機に対する外乱
を極力おさえることができるボイラ給炭機の制御
装置を得るにある。(c) Purpose of the Invention The purpose of the present invention is to calculate the rate of change in combustion amount (= change in amount of coal fed) according to the rate of load change when the number of coal feeders increases or decreases during normal plant operation or during start-up and shutdown of coal-burning machines. From this, calculate the speed change rate of the coal feeder and automatically control the speed of the coal feeder based on the speed change rate corresponding to this load change rate, and calculate the amount of coal feed corresponding to the load change. To obtain a control device for a boiler coal feeder that can suppress disturbance to the coal feeder during automatic operation as much as possible by covering the increase and decrease with the coal feeder that is automatically excluded.
(d) 発明の構成
以下、第２図および第３図に示す一実施例を参
照して本発明を説明する。第２図は本発明の制御
装置Ｘをくみこんだ給炭機系統のプラント統括制
御装置の制御ブロツク図である。信号１００は全
給炭量、信号１０１は全燃料油量を示し、加算器
５０で両者は加えられて全燃料流量１０２とな
る。通常50％負荷以上になると全燃料油流量１０
１は０となり信号１００と１０２は等しくなる。
信号１０３は負荷指令であり、関数発生器５１を
通じて燃焼量指令１０４が作られる。５２は偏差
演算器で全燃料流量１０２と燃焼量指令１０４と
の燃料流量偏差１０５を求めるものである。５３
はゲイン補正器で自動モードの状態にある給炭機
の数によつて燃料量指令を給炭機ごとの指令に補
正するものである。５４はPID演算器でゲイン補
正器５３で補正された燃焼量指令より給炭機速度
指令１０６′を演算する。信号１０６′は通称ミル
マスタと呼ばれ石炭系統の流量制御の基本となる
信号であるが、ミルマスタ切替スイツチ５４′が
手動になつている時は手動で設定された目標値１
０６″にて給炭機速度制御が行なわれる。ミルマ
スタ切替スイツチ５４′後の信号１０６は全給炭
機に一様に伝えられる。図中では以降複数台の給
炭機を対象とした図をかいているが動作内容は同
一であるため以降ａ系統についてのみ記述する。(d) Structure of the Invention The present invention will be described below with reference to an embodiment shown in FIGS. 2 and 3. FIG. 2 is a control block diagram of a plant integrated control device for a coal feeder system incorporating the control device X of the present invention. A signal 100 indicates the total amount of coal to be fed, and a signal 101 indicates the total amount of fuel oil, and the adder 50 adds the two to obtain the total fuel flow rate 102. Normally, when the load exceeds 50%, the total fuel oil flow rate is 10
1 becomes 0 and signals 100 and 102 become equal.
A signal 103 is a load command, and a combustion amount command 104 is generated through a function generator 51. Reference numeral 52 denotes a deviation calculator which calculates a fuel flow rate deviation 105 between the total fuel flow rate 102 and the combustion amount command 104. 53
is a gain corrector that corrects the fuel amount command to a command for each coal feeder depending on the number of coal feeders in automatic mode. A PID calculator 54 calculates a coal feeder speed command 106' from the combustion amount command corrected by the gain corrector 53. The signal 106' is commonly called the mill master and is the basic signal for controlling the flow rate of the coal system.When the mill master changeover switch 54' is set to manual, the manually set target value 1 is
Coal feeder speed control is performed at 06''.The signal 106 after the mill master changeover switch 54' is uniformly transmitted to all coal feeders. However, since the operation contents are the same, only the a system will be described below.
５５ａは給炭機ごとに自動手動を切替えるため
のスイツチで本図においてはａ系統が手動、ｂ〜
ｙ系統が自動状態である。５６ａは制御対象であ
る給炭機であり信号１０７ａは実給炭機速度であ
る。５７ａは関数発生器で給炭機速度１０７ａを
給炭量１０８ａに変換する。加算器５８は各給炭
量１０８ａ〜ｚを加算して全給炭量信号１００を
作る。 55a is a switch for switching automatic to manual for each coal feeder, and in this figure, system a is manual, system b is
y system is in automatic state. 56a is a coal feeder to be controlled, and a signal 107a is the actual coal feeder speed. A function generator 57a converts the coal feeder speed 107a into a coal feed amount 108a. Adder 58 adds each coal feed amount 108a-z to produce total coal feed amount signal 100.
以上がプラント統括制御装置８内での給炭機の
制御の概要であるが、本発明ではこれにボイラ給
炭機の制御装置Ｘを設け、手動時の給炭機の速度
制御を行なわせている。図中５９が主演算部で外
部より負荷変化率信号１０９、給炭機速度目標信
号１０６、給炭機実速度信号１０７ａ〜ｚを入力
して、給炭機速度指令信号１１０を計算する。６
０は各給炭機への信号切替スイツチで各給炭機の
うちAPC制御外で運転中のものに切替えて信号
１１０にてアナログメモリ６１ａを設定するよう
にする。負荷変化率信号１０９は、関数発生器６
３を通つて燃料量変化率信号１１１に変換され、
さらに関数発生器６２を通つて給炭機速度変化率
信号１１２に変換される。６４は給炭機制御信号
発生器である。 The above is an overview of the control of the coal feeder within the plant integrated control device 8, but in the present invention, a boiler coal feeder control device X is provided in this to control the speed of the coal feeder during manual operation. There is. In the figure, numeral 59 denotes a main calculation unit which calculates a coal feeder speed command signal 110 by inputting a load change rate signal 109, a coal feeder speed target signal 106, and coal feeder actual speed signals 107a to 107z from the outside. 6
0 is a signal changeover switch for each coal feeder, which switches the coal feeder to the coal feeder that is operating outside of APC control, and sets the analog memory 61a with a signal 110. The load change rate signal 109 is generated by the function generator 6
3 into a fuel quantity change rate signal 111,
The signal is further converted into a coal feeder speed change rate signal 112 through a function generator 62 . 64 is a coal feeder control signal generator.
第３図は給炭機制御信号発生器６４の機能を示
すフローチヤートである。まず、STEP1で制御
に必要な給炭機速度目標値１０６と速度変化率信
号１１２を読みこむ。STEP2で目標値をある一
定値Ｋと比較して、降速要求が昇速要求か決定す
る。このＫは給炭機が手動から自動へ投入できる
最小の速度目標値であり、給炭機起動時の速度目
標値は必ずＫ以上となつている。逆に給炭機停止
時には速度目標値はミルの最低負荷制限より定ま
る値（K′とする、Ｋ＞K′）に設定されている。
故に目標値＞Ｋで昇速要求、目標値＜Ｋにて降速
要求と判断することが可能である。STEP3では
速度変化率指令信号をもとに出力パルス信号を決
定するが通常は機器側の制約より１回の最大駆動
量が決まつているため求めた出力パルス信号がこ
の最大駆動量を上回つてる場合には、この最大駆
動量にて制御を行なう。 FIG. 3 is a flowchart showing the functions of the coal feeder control signal generator 64. First, in STEP 1, the coal feeder speed target value 106 and speed change rate signal 112 necessary for control are read. In STEP 2, the target value is compared with a certain constant value K to determine whether the speed reduction request is a speed increase request. This K is the minimum speed target value that allows the coal feeder to switch from manual to automatic, and the speed target value when starting the coal feeder is always K or higher. Conversely, when the coal feeder is stopped, the target speed value is set to a value determined by the minimum load limit of the mill (K', where K>K').
Therefore, it is possible to determine that a speed increase is required when the target value>K, and a speed decrease request is determined when the target value <K. In STEP 3, the output pulse signal is determined based on the speed change rate command signal, but since the maximum drive amount per time is usually determined due to restrictions on the equipment side, the obtained output pulse signal exceeds this maximum drive amount. If it is, control is performed using this maximum drive amount.
次にSTEP4ではパルス出力を行ない、実際の
速度に応答があらわれる遅れ時間分タイムデイレ
イをかける。STEP5では目標値と実速度との偏
差を計算して、その偏差が規定値ε以内であれば
制御完了とみなして制御を終了しそうでない場合
にはSTEP1〜５をくり返す。 Next, in STEP 4, a pulse is output and a time delay is applied for the delay time required for a response to appear on the actual speed. In STEP 5, the deviation between the target value and the actual speed is calculated, and if the deviation is within the specified value ε, it is assumed that the control is completed, and if the control is not likely to end, STEP 1 to 5 are repeated.
(e) 発明の効果
本発明による給炭機の制御装置を用いると給炭
機の起動・停止過程において負荷変化率を先行的
にとらえて給炭機の速度制御を行なうため、負荷
の増減による全燃料流量の変化分は、起動・停止
を行なう給炭機がまかなうことになる。したがつ
て、プラント統括制御装置のミルマスタ信号は、
給炭機の起動・停止の最中においてもほぼ一定に
保たれ、プラント統括制御装置の他の主要信号へ
影響がほとんどなくなるため、プラントへの外乱
を最小限にすることができるという利点がある。(e) Effects of the Invention When the control device for a coal feeder according to the present invention is used, the speed of the coal feeder is controlled by detecting the load change rate in advance during the start/stop process of the coal feeder. The change in the total fuel flow rate will be covered by the coal feeder that starts and stops. Therefore, the mill master signal of the plant general control device is
It remains almost constant even when the coal feeder is started and stopped, and has almost no effect on other main signals of the plant general control device, which has the advantage of minimizing disturbances to the plant. .
第１図は石炭火力発電所のブロツク構成図、第
２図は本発明の一実施例を示すブロツク図、第３
図は主演算部の動作を示すフローチヤートであ
る。
Ｘ……制御装置、５９……主演算部、６０……
信号切換スイツチ、６２，６３……関数発生器、
６４……給炭機制御信号発生器。
Fig. 1 is a block diagram of a coal-fired power plant, Fig. 2 is a block diagram showing an embodiment of the present invention, and Fig. 3 is a block diagram showing an embodiment of the present invention.
The figure is a flowchart showing the operation of the main processing section. X...Control device, 59...Main calculation unit, 60...
Signal changeover switch, 62, 63...Function generator,
64... Coal feeder control signal generator.
Claims (1)
給するための複数台の給炭機と、供給された石炭
を粉砕する粉砕機とを有したボイラ燃料供給系統
の前記複数台の給炭機のうち起動停止しようとす
る給炭機を制御するものにおいて、前記起動停止
しようとする給炭機を選択するための信号切替ス
イツチと、ボイラの燃焼系とタービンの蒸気系と
の双方を互いに協調をとりながら制御するプラン
ト統括制御装置からの負荷変化率指令を前記起動
停止しようとする給炭機の速度変化率信号に変換
する関数発生器と、前記プラント統括制御装置か
らの速度目標値信号と前記起動停止しようとする
給炭機の実速度信号との偏差および前記速度変化
率信号に基づいて前記給炭機の速度が前記速度変
化率信号で示される速度変化率で前記速度目標値
になるように給炭機の速度を制御するための給炭
機速度制御信号を演算するための給炭機制御信号
発生器とを備え、給炭機起動停止時の速度制御を
そのときの負荷変化率に基づいて行なうことを特
徴とするボイラ給炭機の制御装置。1 Start-up of the plurality of coal feeders of the boiler fuel supply system, which has a plurality of coal feeders for supplying coal as fuel to the boiler of the power generation unit and a pulverizer for crushing the supplied coal. In a device that controls a coal feeder to be stopped, the signal changeover switch for selecting the coal feeder to be started and stopped, and the combustion system of the boiler and the steam system of the turbine are controlled while coordinating with each other. a function generator that converts a load change rate command from a plant general control device to be controlled into a speed change rate signal of the coal feeder to be started and stopped; a speed target value signal from the plant general control device and the start and stop; The speed of the coal feeder is fed so that the speed of the coal feeder reaches the speed target value at the speed change rate indicated by the speed change rate signal based on the deviation from the actual speed signal of the coal feeder to be processed and the speed change rate signal. A coal feeder control signal generator for calculating a coal feeder speed control signal for controlling the speed of the coal feeder is provided, and the speed control when starting and stopping the coal feeder is performed based on the load change rate at that time. A control device for a boiler coal feeder, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18446281A JPS5886322A (en) | 1981-11-19 | 1981-11-19 | Controlling device for mechanical stokers of boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18446281A JPS5886322A (en) | 1981-11-19 | 1981-11-19 | Controlling device for mechanical stokers of boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5886322A JPS5886322A (en) | 1983-05-23 |
| JPS6334365B2 true JPS6334365B2 (en) | 1988-07-11 |
Family
ID=16153571
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18446281A Granted JPS5886322A (en) | 1981-11-19 | 1981-11-19 | Controlling device for mechanical stokers of boiler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5886322A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3808303B2 (en) * | 2000-10-19 | 2006-08-09 | 川重冷熱工業株式会社 | A method for controlling the number of boilers that continuously control the amount of combustion |
| KR100668685B1 (en) | 2005-01-31 | 2007-01-15 | 한국동서발전(주) | Method for Calculating Speed Requlation Rate and Output Ramp Rate of Generator in the Thermal Power Plant and Computer Readable Recording Medium for Performing Same |
-
1981
- 1981-11-19 JP JP18446281A patent/JPS5886322A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5886322A (en) | 1983-05-23 |
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