JPS5913809A - Method of controlling feedwater of drum boiler - Google Patents
Method of controlling feedwater of drum boilerInfo
- Publication number
- JPS5913809A JPS5913809A JP12292582A JP12292582A JPS5913809A JP S5913809 A JPS5913809 A JP S5913809A JP 12292582 A JP12292582 A JP 12292582A JP 12292582 A JP12292582 A JP 12292582A JP S5913809 A JPS5913809 A JP S5913809A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- water
- turbine
- drum
- drum level
- 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
Landscapes
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
この発明はドラムボイラにおいて、PCB(Fast
Cut BackまたはFuel Cat Back
)発生時のドラムレベルの低Fを補償する給水制御方法
に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention uses PCB (Fast
Cut Back or Fuel Cat Back
) relates to a water supply control method for compensating for a low drum level F at the time of occurrence.
火力発電所の送tSt系統事故などによって火力発電ユ
ニットが系統から切り離されると、瞬時に、発電機出力
はわずか数係の所内用補機電力まで低Fし、タービンも
短時間、無負lf?運転状態となる。When a thermal power generation unit is disconnected from the grid due to an accident in the transmission tSt system of a thermal power plant, the generator output instantly drops to just a few coefficients of power for the auxiliary equipment in the station, and the turbine also goes unloaded for a short period of time. It will be in operation state.
これらの状態を検知して、ボイラは給水、燃料、空気な
どのボイラ入力をボイラ最低直性まで急速に絞り込んで
榮定させ、ユニットヲ所内単独負荷運転に棧行させる。Upon detection of these conditions, the boiler rapidly throttles and adjusts boiler inputs such as feed water, fuel, and air to the boiler's lowest linearity, allowing the unit to return to single-load operation within the plant.
このような運転機能を総称してPCBといっている。These operating functions are collectively called PCB.
PCBが発生したとき、ドラムボイラにおいては、燃料
の絞り込みに伴う火炉収熱の減少や、過渡的な主蒸気圧
力の上昇等の影響を受け、炉壁管内の気泡がつぶされる
ため、ドラムレベルが低Fし・蒸気流量の減少に見合っ
た給水流量ではドラムレベルが低Fし、ボイラトリップ
となるおそれがある。When a PCB occurs in a drum boiler, the air bubbles in the furnace wall tube are crushed due to the effects of a decrease in furnace heat absorption due to fuel throttling and a transient increase in main steam pressure, resulting in a drop in the drum level. If the feed water flow rate is commensurate with the reduction in F/steam flow rate, the drum level will be low and there is a risk of boiler tripping.
Cの発明はPCB時におけるこのようなボイラレベルの
低下を早急に、かつ正(1會に補償することができる給
水制御方法を提供しようとするものである。この発明に
よれは、第1図に示すように、PCBが発生してドラム
レベルがN W L (NormalWater L@
vel )よりも−1xx(zは任意の設定値で例えば
3Qs+*)以Fに丁かったら、タービン駆動給水ポン
プにより、大きな流量X t/)l(例えば1ooo
t/′b稈度)で給水を行なイNWL −y tm (
yは任意の設定値で、y (z 、極端な場合y =
Q mであってもよい)まで復帰したら、情動給水ポン
プをサービスインするとともにタービン駆動給水ポンプ
の給水騎を漸減させていくことにより、所望のドラムレ
ベルに到達させるようにしている。The invention of C is intended to provide a water supply control method that can quickly and accurately compensate for such a drop in boiler level during PCB. As shown in the figure, PCB occurs and the drum level becomes N W L (NormalWater L@
If the flow rate is -1xx (z is any set value, e.g. 3Qs+*) or more than -1xx (z is an arbitrary setting value, e.g. 3Qs+*) F than
Water is supplied at NWL −y tm (
y is an arbitrary set value, y (z, in extreme case y =
When the drum level is restored to (may be Qm), the emotional water supply pump is brought into service and the water supply capacity of the turbine-driven water pump is gradually reduced to reach the desired drum level.
このような方法によれは、ドラムレベルが急激に低ドす
るFC8発生II!j後はタービン駆動給水ポンプによ
り給水するのでこの急激な低Fに追従することができる
。また、所望のレベル近(まで復帰したら、小流瞼の制
菌性が良く、かつ蒸気がなくても給水できる電動給水ポ
ンプに切換えるようにしたので、そのレベルにrE (
tMに到達させることができる。If this method is used incorrectly, the drum level will suddenly drop, causing the FC8 occurrence II! Since water is supplied by the turbine-driven water supply pump after j, it is possible to follow this sudden low F temperature. In addition, once the rE has returned to near the desired level, we switched to an electric water supply pump that has good antibacterial properties for small eyelids and can supply water without steam, so that rE (
tM can be reached.
以Fこの発明の実施例を蓋付図面を参照して詐しく説明
する。Hereinafter, embodiments of the present invention will be falsely described with reference to drawings with a lid.
第2図において、PCB発生を示す信号S1はアンド回
路]の一方入力端および遅延回路(ここでは遅延時間は
10秒に設定しである)2、ノント回路3?介してアン
ド回路1の他方入力端に加えられる。したがってアンド
回路1の出力はFC8発生から10秒間% 11となる
。アンド回路4はアンド回路1の出力と、ドラムレベル
がNWL −z 1g以Fになったことを示す信号S2
とン入力し、上記川砂間にドラムレベルがNWL −z
鴎以Fになったときに% 11を出力する。アンドl!
】j路4の出力信号1本オア回路5ヶ弁してタービン駆
動給水ポンプをWt/h(タービン駆動給水ポンプが2
台ある場合にはそれぞれΣt/h)で駆動する摺合信号
となる。In FIG. 2, a signal S1 indicating the occurrence of PCB is one input terminal of an AND circuit, a delay circuit (here, the delay time is set to 10 seconds) 2, a non-AND circuit 3? The signal is applied to the other input terminal of the AND circuit 1 through the signal line. Therefore, the output of the AND circuit 1 becomes %11 for 10 seconds after the occurrence of FC8. AND circuit 4 outputs the output of AND circuit 1 and a signal S2 indicating that the drum level has become NWL -z 1g or higher.
The drum level is NWL -z between the above river sands.
When Oi reaches F, outputs %11. And l!
] One output signal of J route 4 and five OR circuits are used to drive the turbine-driven water supply pump Wt/h (turbine-driven water supply pump is 2
If there are any units, a sliding signal is used to drive each unit at Σt/h).
アンド回路6はオア回路5の出力と、ドラムレベルがN
WL −7關!で復帰したこと′?ボす信号S3をノッ
ト回路7を介して入力し、ドラムレベルがNWL −y
關に復帰するまでオア回路5の出力を%IIK保持する
。The AND circuit 6 is the output of the OR circuit 5 and the drum level is N.
WL-7! Did you come back? The beat signal S3 is input through the NOT circuit 7, and the drum level is set to NWL -y.
The output of the OR circuit 5 is held at %IIK until it returns to normal operation.
ドラムレベルがN%−7間に復帰すると、オア回路5は
自己保持が解除され、出力がI Q IKなる。この出
力%Olはノット回路11、遅延回路(遅延時間1秒)
12およびノット回路13を弁してアンド回路14に
よる自己保持を解除して、x#fi&(この遅延時間X
はタービン駆動給水ポンプの指骨値の切換時に2つの指
骨値が重ならないように1−るためのもの)にオア回路
8の出力をI Q #にする。オア回路8の出力IQj
はノット回路9で反転されて%1#となり、タービン駆
動給水ポンプKOt/hの指令を与える。ただし、Wt
/hから一気にOt/)、に落とさす、変化率制限器1
0によって徐々に落とするよ5にている。When the drum level returns to between N%-7, the OR circuit 5 releases its self-holding state and outputs IQIK. This output %Ol is a knot circuit of 11, a delay circuit (delay time of 1 second)
12 and the NOT circuit 13 to release the self-holding by the AND circuit 14, x#fi&(this delay time
is used to set the output of the OR circuit 8 to IQ# so that two phalanx values do not overlap when switching the phalanx values of the turbine-driven water supply pump. Output IQj of OR circuit 8
is inverted in the knot circuit 9 to become %1#, giving a command for the turbine-driven feedwater pump KOt/h. However, Wt
Change rate limiter 1, dropping from /h to Ot/) at once
I'm at 5 which will gradually drop by 0.
ノット回路1】の出力は遅延回路(遅延時間X−2秒)
15をブrし℃アンド回路16の一方入力端に加わる
。アンド回路16の他方入力端には前記オア回88の0
侶号出力が加えられている。したがって、アンド回路1
6からは、ドラムレベルがNWL −y IIIに復帰
してからx−2秒優に% 11が電!1]i@水ボング
の目動投入指骨として出力される。The output of knot circuit 1 is a delay circuit (delay time x - 2 seconds)
15 and is applied to one input terminal of the °C AND circuit 16. The other input terminal of the AND circuit 16 is 0 of the OR circuit 88.
The name output has been added. Therefore, AND circuit 1
From 6, the drum level returned to NWL -y III for well over x-2 seconds. 11 was electric! 1] i@Water bong's eye motion input phalanx is output.
第3図は以上説明した第2図の回路の動作を示すもので
ある。これによりPCB発生時の動作を簡単に説明すれ
ば次のようになる。FIG. 3 shows the operation of the circuit of FIG. 2 described above. The operation when a PCB occurs can be briefly explained as follows.
■ PCB発生
■ PCB発生から10秒以内にドラムレベルか廣ルー
翼龍以Fになったら、タービン駆動給水ポンプをWt/
hで駆動
■ ドラムレベルがNWL −7ill fで復帰した
らX−2秒優に電動給水ポンプをサービスインするとと
もに、X砂防にタービン駆%I給水ポンプの給水号指骨
値乞l1li減させる
以上説明したようKこの発明によれは、PCBが発生し
たとぎ、ドラムレベルがあるレベル−2龍よりも低(な
ったら、タービン駆動給水ポンプにより、ドラム円に大
概曖で給水ケ行ない、ドラムレベルが肌に近いレベル−
y tm 9で復帰したらN動給水ボングを駆動すると
ともにタービン躯WEJ給水ポンプの耐水鍛を漸減する
ようにしたので、FCBQIICl、Eけるドラムレベ
ルの低F火早急かつ正確に補償することができる。■ PCB Occurrence■ If the drum level or Hirorou Wing Dragon F is reached within 10 seconds of PCB occurrence, turn off the turbine-driven water supply pump to Wt/
Drive at h ■ When the drum level returns to NWL -7ill f, service the electric water supply pump in just over X-2 seconds, and reduce the water supply number of the turbine-driven water pump by 11li on the X erosion control. According to this invention, as soon as a PCB occurs, if the drum level is lower than a certain level -2, the turbine-driven water pump will supply water to the drum circle in a vague manner, and the drum level will reach the skin level. Near level
After returning at ytm 9, we drove the N-motive water supply bong and gradually reduced the water resistance of the WEJ water pump of the turbine body, so we could quickly and accurately compensate for the low F fire at the drum level caused by FCBQIICl and E.
第1図はこの発明の詳細な説明するためのタイムチャー
ト、1jn2図はこの発明の一実施例を示すく
ブロック図、第3図は第2図の回路の各部の動作を示て
タイムチャートである。
2 、12 、15・・・遅延回路、l(1・・・変化
率制限器。FIG. 1 is a time chart for explaining the invention in detail, FIG. be. 2, 12, 15...Delay circuit, l(1... Rate of change limiter.
Claims (1)
規定値より−i am以F[’Fがったら、タービン駆
動給水ポンプにより大流責で給水を行ない、規定値より
−ylly<z)以上に復帰したら、wL動動水水ポン
プより小流粱の給水を行なうとともに、前記タービン駆
lvI給水ポンプの給水量を漸減させるようにしたこと
を特徴とするドラムボイラの給水制御方法。If a PCB occurs in a drum boiler and the drum level drops below the specified value by -i am or more F['F, the turbine-driven water supply pump supplies water at a large flow rate to restore the drum level to -ylly<z) or higher than the specified value. Then, a small flow of water is supplied from the wL dynamic water pump, and the amount of water supplied by the turbine-driven IvI water pump is gradually reduced.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12292582A JPS5913809A (en) | 1982-07-16 | 1982-07-16 | Method of controlling feedwater of drum boiler |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12292582A JPS5913809A (en) | 1982-07-16 | 1982-07-16 | Method of controlling feedwater of drum boiler |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5913809A true JPS5913809A (en) | 1984-01-24 |
JPH0231281B2 JPH0231281B2 (en) | 1990-07-12 |
Family
ID=14847997
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12292582A Granted JPS5913809A (en) | 1982-07-16 | 1982-07-16 | Method of controlling feedwater of drum boiler |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5913809A (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5223003A (en) * | 1975-05-28 | 1977-02-21 | Ici Ltd | Treating method of transition metal compound olefin polymerization catalyst and process for preparing polymer or copolymer of olefin monomer |
JPS5661504A (en) * | 1979-10-23 | 1981-05-27 | Mitsubishi Heavy Ind Ltd | Water level controlling system for steam generator |
-
1982
- 1982-07-16 JP JP12292582A patent/JPS5913809A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5223003A (en) * | 1975-05-28 | 1977-02-21 | Ici Ltd | Treating method of transition metal compound olefin polymerization catalyst and process for preparing polymer or copolymer of olefin monomer |
JPS5661504A (en) * | 1979-10-23 | 1981-05-27 | Mitsubishi Heavy Ind Ltd | Water level controlling system for steam generator |
Also Published As
Publication number | Publication date |
---|---|
JPH0231281B2 (en) | 1990-07-12 |
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