JPS6045322B2 - Boiler feed water heater water level control device - Google Patents
Boiler feed water heater water level control deviceInfo
- Publication number
- JPS6045322B2 JPS6045322B2 JP1571580A JP1571580A JPS6045322B2 JP S6045322 B2 JPS6045322 B2 JP S6045322B2 JP 1571580 A JP1571580 A JP 1571580A JP 1571580 A JP1571580 A JP 1571580A JP S6045322 B2 JPS6045322 B2 JP S6045322B2
- Authority
- JP
- Japan
- Prior art keywords
- level control
- level
- brushing
- control device
- feed water
- 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
Landscapes
- Control Of Non-Electrical Variables (AREA)
Description
【発明の詳細な説明】
本発明はホイラ給水加熱器の水位制御装置の改良に係り
、特にドレンレベルを安定して制御できるようにした水
位制御装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a water level control device for a wheeler feed water heater, and more particularly to a water level control device that can stably control a drain level.
タービンからの袖気蒸気を用いてボイラ給水を加熱する
ボイラ給水加熱器においては、通常複数のドレン排出系
を設け、加熱器内のドレンレベルおよび圧力に応じてレ
ベル調節弁を制御することによつてドレンを脱気器や低
圧器水加熱器へ排出するようにしている。Boiler feed water heaters that heat boiler feed water using air steam from the turbine usually have multiple drain discharge systems and control level control valves according to the drain level and pressure in the heater. The condensate is then discharged to a deaerator or low-pressure water heater.
しかしながら、このようなボイラ給水加熱器では、負荷
が急激に降下したような場合、器内圧力は急速に低下す
るが、ドレンの温度低下は緩慢であるため、特に高位置
に設置したレベル調節弁の入口側において、ドレンのブ
ラッシング(再蒸気)が発生する危険がある。このブラ
ッシングが始まると、ドレンはその容積を106倍程度
に膨脹させるため、レベル調節弁の容量が不足し、これ
を通しての排出が不可能となる、また、このブラッシン
グ時にはドレンの流れが断続的となるため、通常のフィ
ードバック制御では、ブラッシングとフィードバック信
号との間に激しい干渉が生じ、ハンチング現象によりド
レンレベルが、上・下限間を大きく変動するという不都
合がある。本発明は従来装置における上述の如き不都合
を除去すべくなされたもので、負荷の降下時にこれjを
検出演算することによつてブラッシングの発生を予測し
、この予測信号に基いてドレン排出系の調節計の制御ゲ
インを切換え、ドレンのレベル制御を安定に行なえるよ
うにしたボイラ給水加熱器の水位制御装置を提供しよう
とするものである。However, in such boiler feed water heaters, when the load suddenly drops, the pressure inside the boiler drops rapidly, but the temperature of the drain drops slowly. There is a risk of brushing (re-steaming) of the condensate on the inlet side of the drain. When this brushing begins, the drain expands its volume by about 106 times, so the capacity of the level control valve becomes insufficient, making it impossible to drain through it.Also, during this brushing, the drain flow is intermittent. Therefore, in normal feedback control, severe interference occurs between the brushing and the feedback signal, and the hunting phenomenon causes the drain level to fluctuate greatly between the upper and lower limits. The present invention has been made in order to eliminate the above-mentioned disadvantages in conventional devices, and detects and calculates j when the load decreases to predict the occurrence of brushing, and based on this predicted signal, controls the drain discharge system. The present invention aims to provide a water level control device for a boiler feed water heater that can stably control the drain level by switching the control gain of the controller.
ク 以下、図面に示す実施例につき本発明の詳細を説明
する。第1図においてタービン1から袖無された高温蒸
気は給水加熱器2内に導入され、ボイラ給水ポンプ3に
よつて送り込まれたボイラ給水と間接熱交換を行なつて
これを加熱し、自身は冷却してドレン化し、給水加熱器
2内のドレンだめに貯まる。H The present invention will be described in detail below with reference to embodiments shown in the drawings. In Fig. 1, high-temperature steam discharged from the turbine 1 is introduced into the feed water heater 2, where it is heated by indirect heat exchange with the boiler feed water sent by the boiler feed water pump 3, and the steam itself is cooled. The water is converted into drain and stored in the drain reservoir in the feed water heater 2.
このドレンは更に給水と熱交換を行ない、給水加熱器2
の器内圧力に対する飽和温度以下にオーバークーリング
される。また、加熱されたボイラ給水はボイラ4に向け
て送り出される。給水加熱器2内に貯つたドレンはその
器内圧力が高い場合には、レベル調節弁5を通して高い
位置に設定した脱気器6に排出され、また器内圧力が低
下するとレベル調節弁7を通して低圧器水加熱器8へ排
出される。This drain further performs heat exchange with the feed water, and the feed water heater 2
is overcooled to below the saturation temperature for the internal pressure. Further, the heated boiler feed water is sent toward the boiler 4. When the internal pressure of the feed water heater 2 is high, the condensate is discharged through the level control valve 5 to the deaerator 6 set at a high position, and when the internal pressure decreases, the condensate is discharged through the level control valve 7. It is discharged to the low pressure water heater 8.
これらの場合、給水加熱器2内のドレンレベルはドレン
レベル検出器9によつて検出され、ド゛レンは器内圧力
の高低に応じて選択的に作動するレベル調節計10,1
1により開閉制御されるレベル調節弁5,7を通して脱
気器6または低圧器水加熱器8へ排出されて器内のドレ
ンレベルを所定の範囲内に制御する。上記において、負
荷が降下する場合、加熱給水器2の器内圧力は負荷降下
に従つて直ちに降下す−るが、ドレン温度は応答が遅い
ため、ドレン温度一に対する飽和圧力と器内圧力は接近
する傾向を示す。In these cases, the drain level in the feed water heater 2 is detected by a drain level detector 9, and the drain level is detected by a level controller 10, 1 that selectively operates depending on the level of internal pressure.
The water is discharged to a deaerator 6 or a low-pressure water heater 8 through level control valves 5 and 7 whose opening and closing are controlled by 1, and the drain level in the container is controlled within a predetermined range. In the above, when the load decreases, the internal pressure of the heating water supply device 2 immediately decreases as the load decreases, but since the response of the drain temperature is slow, the saturation pressure and the internal pressure for a drain temperature of 1 are close to each other. shows a tendency to
この場合、特にレベル調節弁5は給水加熱器2より高位
置に設置されていて、それらのヘッド差分だけ入口圧力
が低くなつているので、このレンベル調節弁5の入口で
ドレンがブラッシングを生ずる可能性がある。本発明に
おいては、ブラッシング予測器12とゲイン切換器13
を用いることによつてブラッシングが発生する可能性が
大きくなつた場合にこれ3を予測し、ゲイン切換器13
を切換えてレベル調節弁5の制御ゲインを小さくし、ブ
ラッシングを防止すると共にこれをフィードバックの干
渉による極端な出力変動の発生を予防している。In this case, especially since the level control valve 5 is installed at a higher position than the feed water heater 2, and the inlet pressure is lower by the head difference between them, there is a possibility that the drain may cause brushing at the inlet of the level control valve 5. There is sex. In the present invention, the brushing predictor 12 and the gain switch 13
If the possibility of brushing occurring increases due to the use of
is switched to reduce the control gain of the level control valve 5 to prevent brushing and to prevent extreme output fluctuations due to feedback interference.
第2図はブラッシング予測器12等の具体的回3路構成
を例示するもので、負荷信号は不完全微分器14におい
て負荷降下率を計算された後、負荷降下判別器15に導
かれ、その負荷降下率、ドレン温度およびドレン圧力の
もとでブラッシングが発生するか否かを判別される。FIG. 2 illustrates a specific circuit configuration of the brushing predictor 12, etc. After the load signal has a load drop rate calculated in the incomplete differentiator 14, it is guided to the load drop discriminator 15, and the load signal is guided to the load drop discriminator 15. It is determined whether brushing occurs under the load drop rate, drain temperature, and drain pressure.
通常状態すなわちブラッシングの発生が予測されない場
合には制御ゲイン切換器13は通常状態の制御ゲイン設
定器16に切換えられており、レベル設定器18とレベ
ル信号の偏差値は制御偏差演算器19で演算出力された
後、通常の制御ゲインのもとでPI演算器20て演算さ
れ、A(自動)M(手動)切換操作器21を介して調節
弁5の開閉制御を行なう。こノれに対して、負荷降下判
別器15によりブラッシングの発生が予測される場合に
は、制御ゲイン切換器13はブラッシング状態の制御ゲ
イン設定器17に切換えられ、ごく小さな制御ゲインを
PI演算器20にインプットする。これによつてブラッ
シングの発生は抑制され、また、PI演算器20の出力
変動小さくなり、レベル調節弁5の動作は緩慢となり、
ブラッシングとフィードバックとの激しい干渉は防止さ
れる。以上の如く、本発明によれば負荷の変化に基いて
ブラッシングの発生を予測し、必要な場合にはレベル調
節計20の制御ゲインを小さくしてレベル調節弁の操作
を行なうものであることからブラッシングの発生は抑制
され、また、仮りに発生してもこれとフィードバックの
干渉は防止されるので、給水加熱器2内のドレンレベル
が上限・下限間を大きく変動するようなことはない。In the normal state, that is, when the occurrence of brushing is not predicted, the control gain switch 13 is switched to the control gain setter 16 in the normal state, and the deviation value between the level setter 18 and the level signal is calculated by the control deviation calculator 19. After being output, it is calculated by the PI calculator 20 under the normal control gain, and the opening/closing control of the control valve 5 is performed via the A (automatic)/M (manual) switching operator 21. On the other hand, if the load drop discriminator 15 predicts that brushing will occur, the control gain switch 13 is switched to the control gain setter 17 in the brushing state, and a very small control gain is set to the PI calculator. Enter 20. As a result, the occurrence of brushing is suppressed, the fluctuation in the output of the PI calculator 20 is reduced, and the operation of the level control valve 5 is slowed down.
Severe interference between brushing and feedback is prevented. As described above, according to the present invention, the occurrence of brushing is predicted based on changes in load, and if necessary, the control gain of the level controller 20 is reduced to operate the level control valve. The occurrence of brushing is suppressed, and even if brushing occurs, interference with feedback is prevented, so the drain level in the feed water heater 2 does not fluctuate significantly between the upper and lower limits.
第1図は本発明装置の一実施例を示す系統図、第2図は
本発明装置において使用される制御回路の主要部を例示
するブロック図である。
2・・・・・ボイラ給水加熱器、3・・・・・ボイラ給
水ポンプ、5,7・・・・・ルベル調節弁、9・・・・
◆・ドレンレベル検出器、10,11・・・・・ルベル
調節計、14・・・・不完全微分器、15・・・・・・
負荷降下判別器、16,17・・・・・制御ゲイン設定
器、18・・・・・ルベル設定器、19・・・・・制御
偏差演算器、20・・・・・・PI演算器、21・ ・
・A/M切換操作器。FIG. 1 is a system diagram showing one embodiment of the apparatus of the present invention, and FIG. 2 is a block diagram illustrating the main parts of a control circuit used in the apparatus of the present invention. 2... Boiler feed water heater, 3... Boiler feed water pump, 5, 7... Lebel control valve, 9...
◆・Drain level detector, 10, 11... Lebel controller, 14... Imperfect differentiator, 15...
Load drop discriminator, 16, 17... Control gain setter, 18... Lebel setter, 19... Control deviation calculator, 20... PI calculator, 21・・
・A/M switching operation device.
Claims (1)
イラ給水加熱器のドレン排水系に設けたレベル調節弁を
レベル調節計によつて制御する水位制御装置において、
負荷の変動に基いてブラッシングの発生を予測するブラ
ッシング予測器と、この予測器出力に基いて前記レベル
調節弁ゲインを切換えるゲイン切換器とを備えることを
特徴とするボイラ給水加熱器の水位制御装置。 2 ブラッシング予測器が不完全微分器と負荷降下判別
から成る特許請求の範囲第1項記載のボイラ給水加熱器
の水位制御装置。 3 レベル調節計がレベル設定器、制御偏差演算器、、
PI演算器およびA/H切換操作器とから成る特許請求
の範囲第1項または第2項記載のボイラ給水加熱器の水
位制御装置。 4 ブラッシング予測器とゲイン切換器が、複数のドレ
ン排出系の高位側のレベル調節弁を制御するレベル調節
計にのみ取付けられている特許請求の範囲第1項ないし
第4項のいずれか1項に記載のボイラ給水加熱器の水位
制御装置。[Claims] 1. A water level control device that uses a level controller to control a level control valve provided in a drain drainage system of a boiler feed water heater that heats boiler feed water with extracted steam from a turbine,
A water level control device for a boiler feedwater heater, comprising: a brushing predictor that predicts the occurrence of brushing based on load fluctuation; and a gain switch that switches the level control valve gain based on the output of the predictor. . 2. The water level control device for a boiler feed water heater according to claim 1, wherein the brushing predictor comprises an incomplete differentiator and a load drop determination. 3 The level controller is a level setter, a control deviation calculator, etc.
A water level control device for a boiler feedwater heater according to claim 1 or 2, comprising a PI calculator and an A/H switching operation device. 4. Any one of claims 1 to 4, in which the brushing predictor and the gain switch are attached only to a level controller that controls higher-level level control valves of a plurality of drain discharge systems. A water level control device for a boiler feedwater heater described in .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1571580A JPS6045322B2 (en) | 1980-02-12 | 1980-02-12 | Boiler feed water heater water level control device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1571580A JPS6045322B2 (en) | 1980-02-12 | 1980-02-12 | Boiler feed water heater water level control device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS56113905A JPS56113905A (en) | 1981-09-08 |
JPS6045322B2 true JPS6045322B2 (en) | 1985-10-08 |
Family
ID=11896453
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1571580A Expired JPS6045322B2 (en) | 1980-02-12 | 1980-02-12 | Boiler feed water heater water level control device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6045322B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0217513U (en) * | 1988-07-20 | 1990-02-05 | ||
JPH0217512U (en) * | 1988-07-20 | 1990-02-05 | ||
JPH0222315U (en) * | 1988-07-27 | 1990-02-14 |
-
1980
- 1980-02-12 JP JP1571580A patent/JPS6045322B2/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0217513U (en) * | 1988-07-20 | 1990-02-05 | ||
JPH0217512U (en) * | 1988-07-20 | 1990-02-05 | ||
JPH0222315U (en) * | 1988-07-27 | 1990-02-14 |
Also Published As
Publication number | Publication date |
---|---|
JPS56113905A (en) | 1981-09-08 |
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