JPS62162818A - Mill control method in pulverized-coal-firing boiler - Google Patents
Mill control method in pulverized-coal-firing boilerInfo
- Publication number
- JPS62162818A JPS62162818A JP61001326A JP132686A JPS62162818A JP S62162818 A JPS62162818 A JP S62162818A JP 61001326 A JP61001326 A JP 61001326A JP 132686 A JP132686 A JP 132686A JP S62162818 A JPS62162818 A JP S62162818A
- Authority
- JP
- Japan
- Prior art keywords
- deviation
- signal
- steam pressure
- main steam
- boiler load
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/08—Regulating fuel supply conjointly with another medium, e.g. boiler water
- F23N1/082—Regulating fuel supply conjointly with another medium, e.g. boiler water 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Feeding And Controlling Fuel (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は微粉炭焚きボイラのミル制御法に関し、原動機
製品の微粉炭焚きボイラに広く適用される。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a mill control method for a pulverized coal-fired boiler, and is widely applied to a pulverized coal-fired boiler as a motor product.
従来の技術
従来の微粉炭焚きボイラとしては、直接燃焼方式と間接
燃焼方式とに大別され、負荷応答性については間接燃焼
方式が優れているが、システム全体が複雑でコストアッ
プとなるため、現在はあまり採用されていない。直接燃
焼方式においては、ミルの応答性が負荷応答性のネック
となっており、従来は、ミルー次空気量の増減および給
炭量の増減で追従していたが、必ずしも十分ではなかっ
た。Conventional technology Conventional pulverized coal-fired boilers are broadly divided into direct combustion methods and indirect combustion methods.The indirect combustion method is superior in terms of load response, but the overall system is complex and costs increase. It is currently not widely used. In the direct combustion method, the responsiveness of the mill is the bottleneck for load responsiveness, and conventionally this has been achieved by increasing/decreasing the amount of secondary air in the mill and increasing/decreasing the amount of coal feed, but this has not always been sufficient.
発明が解決しようとする問題点
従来技術の中で、ミルー次空気量の増減は、固定式セパ
レータの場合、比較的効果的であったが、ロータリ式セ
パレータの場合はその効果において若干減少し【いると
判断される。しかし、いずれまた、給炭量の増減は、一
旦、ミルボウル上で石炭が粉砕されて微粉になるまでの
時間を必要とするため、応答時間は更に遅いものとなる
。Problems to be Solved by the Invention In the prior art, fixed separators were relatively effective in increasing and decreasing the Millu air volume, but rotary separators slightly decreased the effect. It is determined that there is. However, increasing or decreasing the amount of coal fed requires time for the coal to be pulverized into fine powder on the mill bowl, which further slows down the response time.
本発明は、これらミルの応答遅れを小さくする制御法を
提供することを目的とする。An object of the present invention is to provide a control method that reduces the response delay of these mills.
問題点を解決するための手段
本発明によれば、ミルの分級装置としてロータリセパレ
ータを採用してミルの微粉供給応答遅れを最小とし、そ
のロータリセパレータを可変モータにて駆動し、この可
変モータの回転数をボイラ負荷（主蒸気圧力）と設定ボ
イラ負荷との偏差に基いて制御してミルからの微粉供給
の増減を行なわせるようにしている。Means for Solving the Problems According to the present invention, a rotary separator is employed as the mill's classification device to minimize the delay in the mill's fine powder supply response, and the rotary separator is driven by a variable motor. The rotation speed is controlled based on the deviation between the boiler load (main steam pressure) and the set boiler load to increase or decrease the supply of fine powder from the mill.
作用
ロータリセパレータの回転数とミル出口の微粉度との関
係を示した第１図から明らかな如（、ロータリセパレー
タの回転数を上げていけば微粉度は上がり、回転数を下
げれば微粉度も下がる。すなわち、ロータリセパレータ
の回転数に反比例してミルより出ていく粗分り量が変化
し、ひいては、トータル微粉量が変化することになる。It is clear from Figure 1, which shows the relationship between the rotation speed of the rotary separator and the fineness at the mill outlet (as the rotation speed of the rotary separator increases, the fineness increases, and as the rotation speed decreases, the fineness decreases. In other words, the amount of coarse powder coming out of the mill changes in inverse proportion to the rotational speed of the rotary separator, and as a result, the total amount of fine powder changes.
換言すれば、ロータリセパレータの回転数の変化によっ
て、微粉の供給量をある範囲で制御可能である。In other words, the amount of fine powder supplied can be controlled within a certain range by changing the rotational speed of the rotary separator.
実施例
第２図は、本発明によるロータリセパレータ付ボウルミ
ルの制御法を実施するための制御系統を示している。Embodiment FIG. 2 shows a control system for implementing the control method for a bowl mill with a rotary separator according to the present invention.
第２図において、従来のシステムには、ボイラ負荷を検
出する主蒸気圧力発信器１１ボイラマスタコントローラ
２、および主蒸気圧力設定器４を備えてボイラマスタ信
号３を得る系統がある。この系統では、主蒸気圧力発信
器１により主蒸気圧力（ボイラ負荷）を信号変換してボ
イラマスタコントローラ２に信号を伝え、このボイラマ
スタコントローラ２では、主蒸気圧力設定器４により与
えられた主蒸気圧力設定値（設定ボイラ負荷）との偏差
ＰＩＤ （比例−積分−微分）演算して各種燃料（微粉
炭量、重油量等）および燃焼用空気流量を調節し、ボイ
ラマスタコントロー−）２での偏差がな（なるよう制御
が行なわれる。In FIG. 2, the conventional system includes a main steam pressure transmitter 11 for detecting the boiler load, a boiler master controller 2, and a main steam pressure setting device 4 to obtain a boiler master signal 3. In this system, a main steam pressure transmitter 1 converts the main steam pressure (boiler load) into a signal and transmits the signal to a boiler master controller 2. The deviation PID (proportional-integral-derivative) from the steam pressure set value (set boiler load) is calculated to adjust various fuels (pulverized coal amount, heavy oil amount, etc.) and combustion air flow rate, and the boiler master controller (2) Control is performed so that there is no deviation.
本発明では従来の系統に加え、偏差演算器５、関数発生
器６、微分演算器７、加算器８、遠隔手動設定器９、切
替器１０、およびロータリセパレータ可変モータ１１が
付加されている。In the present invention, in addition to the conventional system, a deviation calculator 5, a function generator 6, a differential calculator 7, an adder 8, a remote manual setting device 9, a switch 10, and a rotary separator variable motor 11 are added.
偏差演算器５では主蒸気圧力発信器ｌがらの信号と主蒸
気圧力設定器４からの設定値との偏差を演算して関数発
生器６に伝える。この関数発生器６は第３図に示すよう
な主蒸気圧力偏差（入力信号）とロータリセパレータ回
転数（出力信号）との設定カーブが与えられている。た
とえば、１）主蒸気圧力偏差＝０の点ａに於いては、回
転数は定格回転数Ａが設定となる。尚、主蒸気圧力の微
少な変化に対する外乱を防止するために偏差ａ±αの不
感帯を設定しておく。The deviation calculator 5 calculates the deviation between the signal from the main steam pressure transmitter 1 and the set value from the main steam pressure setter 4, and transmits it to the function generator 6. This function generator 6 is provided with a setting curve of main steam pressure deviation (input signal) and rotary separator rotation speed (output signal) as shown in FIG. For example, 1) At point a where the main steam pressure deviation=0, the rotation speed is set to the rated rotation speed A. Note that a dead zone of deviation a±α is set in order to prevent disturbance due to minute changes in main steam pressure.
２）主蒸気圧力偏差が（＋）側になった場合（ｂ点）、
回転数も上昇（上限Ｂ点）させ、微粉の供給量能力を低
下させる。2) When the main steam pressure deviation is on the (+) side (point b),
The rotational speed is also increased (upper limit point B) to reduce the ability to supply fine powder.
３）逆に主蒸気圧力偏差が（−）側になった場合（ｄ点
）、回転数は下降（下限り点）させ、微粉の供給量能力
を上昇させる。3) Conversely, when the main steam pressure deviation is on the negative side (point d), the rotation speed is lowered (lower limit point) to increase the ability to supply fine powder.
更に、ロータリセパレータ回転数変化の効果を上げるた
め、偏差演算器５からの偏差信号を微分演算器７にて微
分演算し、この微分信号を加算器８により関数発生器６
からの設定信号に加算する。Furthermore, in order to increase the effect of changing the rotational speed of the rotary separator, the deviation signal from the deviation calculator 5 is differentiated by the differential calculator 7, and this differential signal is sent to the function generator 6 by the adder 8.
Add to the setting signal from.
加算された信号は遠隔手動設定器９からの手動設定値と
切替器１０により切替えられてロータリセパレータ可変
モータ１１に与えられる。このようにして、ロータリセ
パレータ可変モータ１１は主蒸気圧力すなわちボイラ負
荷と主蒸気圧力設定値すなわち設定ボイラ負荷との偏差
に基いて回転数が制御される。The added signal is switched between the manual setting value from the remote manual setting device 9 and the switching device 10, and is applied to the rotary separator variable motor 11. In this way, the rotation speed of the rotary separator variable motor 11 is controlled based on the deviation between the main steam pressure, ie, the boiler load, and the main steam pressure set value, ie, the set boiler load.
発明の効果
従来ではミル応答遅れにより、ボイラ負荷変化の際ボイ
ラマスタ圧力追従性が悪く、制御系が安定しにくい傾向
があったが、本発明のようにロータリセパレータ付ボウ
ルミルを採用し、しかもそのセパレータの回転数をボイ
ラ負荷と設定ボイラ負荷との偏差に基いて制御するよう
にしたことＫよって、ミル応答性が改善され、ボイラ負
荷変化に対する応答が大幅に改善される。Effects of the Invention In the past, due to the mill response delay, boiler master pressure followability was poor when the boiler load changed, and the control system tended to be difficult to stabilize.However, as in the present invention, a bowl mill with a rotary separator is used, and the separator By controlling the rotation speed of the mill based on the deviation between the boiler load and the set boiler load, the mill responsiveness is improved and the response to changes in the boiler load is significantly improved.
第１図は本発明による制御法を説明するためのロータリ
セパレータ回転数対微粉度の関係を示す図、第２図は本
発明による制御法を実施するための制御系統を示す図、
第３図は関数発生器の特性を示す図である。
１・・主蒸気圧力発信器、２・・ボイラマスタコントロ
ーラ、３・φボイラマスタ信号、４・・主蒸気圧力設定
器、５・・偏差演算器、６・・関数発生器、７・・微分
演算器、８・・加算器、９・・遠隔手動設定器、１０・
・切替器、１１・・（ほか７名）
第１図FIG. 1 is a diagram showing the relationship between rotary separator rotation speed and fineness for explaining the control method according to the present invention, and FIG. 2 is a diagram showing a control system for implementing the control method according to the present invention.
FIG. 3 is a diagram showing the characteristics of the function generator. 1. Main steam pressure transmitter, 2. Boiler master controller, 3. φ boiler master signal, 4. Main steam pressure setting device, 5. Deviation calculator, 6. Function generator, 7. Differential calculation. device, 8...adder, 9...remote manual setting device, 10...
・Switcher, 11...(7 other people) Figure 1
Claims (1)
ータ付ボウルミルを採用し、このロータリセパレータを
可変モータにて駆動し、この可変モータの回転数をボイ
ラ負荷と設定ボイラ負荷との偏差に基いて制御するよう
にしたことを特徴とする微粉炭焚きボイラのミル制御法
。In a pulverized coal-fired boiler, a bowl mill with a rotary separator is used as the mill, this rotary separator is driven by a variable motor, and the rotation speed of this variable motor is controlled based on the deviation between the boiler load and the set boiler load. This is a mill control method for a pulverized coal-fired boiler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61001326A JPH06100330B2 (en) | 1986-01-09 | 1986-01-09 | Mill Control Method for Pulverized Coal Boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61001326A JPH06100330B2 (en) | 1986-01-09 | 1986-01-09 | Mill Control Method for Pulverized Coal Boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62162818A true JPS62162818A (en) | 1987-07-18 |
| JPH06100330B2 JPH06100330B2 (en) | 1994-12-12 |
Family
ID=11498371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61001326A Expired - Lifetime JPH06100330B2 (en) | 1986-01-09 | 1986-01-09 | Mill Control Method for Pulverized Coal Boiler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06100330B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110848727A (en) * | 2019-12-04 | 2020-02-28 | 国网浙江省电力有限公司电力科学研究院 | Adjusting method for improving boiler load response rate |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5689850A (en) * | 1979-12-22 | 1981-07-21 | Ishikawajima Harima Heavy Ind | Classifier for vertical mill |
| JPS5775156A (en) * | 1980-10-28 | 1982-05-11 | Ube Industries | Pulverizer |
| JPS58180242A (en) * | 1982-04-16 | 1983-10-21 | 川崎重工業株式会社 | Shaft type crusher |
| JPS6020021A (en) * | 1983-07-15 | 1985-02-01 | Hitachi Ltd | Fuel device for power plant with combustion of coal |
-
1986
- 1986-01-09 JP JP61001326A patent/JPH06100330B2/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5689850A (en) * | 1979-12-22 | 1981-07-21 | Ishikawajima Harima Heavy Ind | Classifier for vertical mill |
| JPS5775156A (en) * | 1980-10-28 | 1982-05-11 | Ube Industries | Pulverizer |
| JPS58180242A (en) * | 1982-04-16 | 1983-10-21 | 川崎重工業株式会社 | Shaft type crusher |
| JPS6020021A (en) * | 1983-07-15 | 1985-02-01 | Hitachi Ltd | Fuel device for power plant with combustion of coal |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110848727A (en) * | 2019-12-04 | 2020-02-28 | 国网浙江省电力有限公司电力科学研究院 | Adjusting method for improving boiler load response rate |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06100330B2 (en) | 1994-12-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |