JPH0231281B2 - - Google Patents
Info
- Publication number
- JPH0231281B2 JPH0231281B2 JP57122925A JP12292582A JPH0231281B2 JP H0231281 B2 JPH0231281 B2 JP H0231281B2 JP 57122925 A JP57122925 A JP 57122925A JP 12292582 A JP12292582 A JP 12292582A JP H0231281 B2 JPH0231281 B2 JP H0231281B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- drum
- water supply
- turbine
- 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 - Lifetime
Links
Landscapes
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Description
【発明の詳細な説明】
この発明はドラムボイラにおいて、FCB（Fast
Cut BackまたはFuel Cut Back）発生時のドラ
ムレベルの低下を補償する給水制御方法に関す
る。[Detailed Description of the Invention] This invention provides FCB (Fast
This invention relates to a water supply control method that compensates for the drop in drum level when a fuel cut back (cut back or fuel cut back) occurs.
火力発電所の送電線系統事故などによつて火力
発電ユニツ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％の所内用補機電力ま
で低下し、タービンも短時間、無負荷運転状態と
なる。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負荷ま
で急速に絞り込んで整定させ、ユニツトを所内単
独負荷運転に移行させる。このような運転機能を
総称してFCBといつている。 When a thermal power generation unit is disconnected from the power grid due to an accident in the power transmission line at a thermal power plant, the generator output instantly drops to only a few percent of the auxiliary power for the plant, and the turbine also operates without load for a short period of time. state. Detecting these conditions, the boiler will supply water,
Boiler inputs such as fuel and air are rapidly reduced to the boiler minimum load and stabilized, and the unit is shifted to in-house single load operation. These driving functions are collectively called FCB.
FCB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、ドラムレベルが低下
し、蒸気流量の減少に見合つた給水流量ではドラ
ムレベルが低下し、ボイラトリツプとなるおそれ
がある。 When FCB occurs, drum boilers are affected by a decrease in furnace heat absorption due to fuel throttling and a transient increase in main steam pressure, which causes air bubbles in the furnace wall tubes to collapse, causing the drum level to drop. If the feed water flow rate is commensurate with the reduction in steam flow rate, the drum level will drop and there is a risk of boiler trip.
この発明はFCB時におけるこのようなボイラ
レベルの低下を早急に、かつ正確に補償すること
ができる給水制御方法を提供しようとするもので
ある。この発明によれば、第１図に示すように、
FCBが発生してドラムレベルがNWL（Normal
Water Level）よりも−ｚmm（ｚは任意の設定値
で例えば30mm）以下に下がつたら、タービン駆動
給水ポンプにより、大きな流量ｘ ｔ／ｈ（例え
ば1000t／ｈ程度）で給水を行ないNWL−ｙmm
（ｙは任意の設定値で、ｙ＜zp極端な場合ｙ＝０
mmであつてもよい）まで復帰したら、タービン駆
動給水ポンプとは別個に設けた電動給水ポンプを
サービスインするとともにタービン駆動給水ポン
プの給水量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。この
ような方法によれば、ドラムレベルが急激に低下
するFCB発生直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下に追従すること
ができる。また、所望のレベル近くまで復帰した
ら、小流量の制御性が良く、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、そのレベルに正確に到達させることができ
る。 The present invention aims to provide a water supply control method that can quickly and accurately compensate for such a drop in boiler level during FCB. According to this invention, as shown in FIG.
FCB occurs and the drum level becomes NWL (Normal).
When the water level drops below -zmm (z is an arbitrary set value, e.g. 30mm), the turbine-driven water supply pump supplies water at a large flow rate of x t/h (e.g. about 1000t/h). ymm
(y is an arbitrary setting value, and in the extreme case y<z p, y=0
mm), then the electric water pump installed separately from the turbine-driven water pump is brought into service, and the water supply amount of the turbine-driven water pump is gradually reduced to reach the desired drum level. I try to let them do it. According to such a method, water is supplied by the turbine-driven water supply pump immediately after the occurrence of FCB when the drum level rapidly decreases, so that it is possible to follow this rapid decrease. Furthermore, once the water has returned to near the desired level, the system switches to an electric water supply pump that has good controllability at small flow rates and can supply water even without steam, making it possible to reach that level accurately.
以下この発明の実施例を添付図面を参照して詳
しく説明する。 Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
第２図において、FCB発生を示す信号S1はア
ンド回路１の一方入力端および遅延回路（ここで
は遅延時間は10秒に設定してある）２、ノツト回
路３を介してアンド回路１の他方入力端に加えら
れる。したがつてアンド回路１の出力はFCB発
生から10秒間“１”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−ｚmm
以下になつたことを示す信号S2とを入力し、上
記10秒間にドラムレベルがNWL−ｚmm以下にな
つたときに“１”を出力する。アンド回路４の出
力信号はオア回路５を介してタービン駆動給水ポ
ンプをＷ ｔ／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ｚ／２ｔ／ｈ）で駆動する
指令信号となる。 In FIG. 2, a signal S1 indicating FCB generation is passed through one input terminal of AND circuit 1, a delay circuit (here, the delay time is set to 10 seconds) 2, and a NOT circuit 3 to the other input terminal of AND circuit 1. Added to the ends. Therefore, the output of the AND circuit 1 becomes "1" for 10 seconds after the occurrence of FCB. AND circuit 4 has the output of AND circuit 1 and the drum level NWL-zmm
It inputs a signal S2 indicating that the drum level is below NWL-zmm, and outputs "1" when the drum level falls below NWL-zmm during the above 10 seconds. The output signal of the AND circuit 4 is sent to the turbine-driven water supply pump via the OR circuit 5.
If there are any units, the command signal is to drive each unit at a speed of z/2t/h).
アンド回路６はオア回路５の出力と、ドラムレ
ベルがNWL−ｙmmまで復帰したことを示す信号
S3をノツト回路７を介して入力し、ドラムレベ
ルがNWL−ｙmmに復帰するまでオア回路５の出
力を“１”に保持する。 AND circuit 6 is the output of OR circuit 5 and a signal indicating that the drum level has returned to NWL-ymm.
S3 is input through the NOT circuit 7, and the output of the OR circuit 5 is held at "1" until the drum level returns to NWL-ymm.
ドラムレベルがNWL−ｙmmに復帰すると、オ
ア回路５は自己保持が解除され、出力が“０”に
なる。この出力“０”はノツト回路１１、遅延回
路（遅延時間ｘ秒）１２およびノツト回路１３を
介してアンド回路１４による自己保持を解除し
て、ｘ秒後（この遅延時間ｘはタービン駆動給水
ポンプの指令値の切換時に２つの指令値が重なら
ないようにするためのもの）にオア回路８の出力
を“０”にする。オア回路８の出力“０”はノツ
ト回路９で反転されて“１”となり、タービン駆
動給水ポンプに0t／ｈの指令を与える。ただし、
Ｗ ｔ／ｈから一気に0t／ｈに落とさず、変化率
制限器１０によつて徐々に落とすようにている。 When the drum level returns to NWL-ymm, the OR circuit 5 releases its self-holding state and outputs "0". This output "0" releases the self-holding by the AND circuit 14 via the NOT circuit 11, the delay circuit (delay time x seconds) 12, and the NOT circuit 13, and after x seconds (this delay time The output of the OR circuit 8 is set to "0" (this is to prevent two command values from overlapping when switching the command values). The output "0" of the OR circuit 8 is inverted to "1" by the knot circuit 9, and a command of 0 t/h is given to the turbine-driven water supply pump. however,
The rate of change limiter 10 gradually reduces the rate of change from W t/h to 0 t/h instead of reducing it all at once.
ノツト回路１１の出力は遅延回路（遅延時間ｘ
−２秒）１５を介してアンド回路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
記オア回路８の０信号出力が加えられている。し
たがつて、アンド回路１６からは、ドラムレベル
がNWL−ｙmmに復帰してからｘ−２秒後に
“１”が電動給水ポンプの自動投入指令として出
力される。 The output of the knot circuit 11 is a delay circuit (delay time x
-2 seconds) 15 to one input terminal of the AND circuit 16. The 0 signal output from the OR circuit 8 is applied to the other input terminal of the AND circuit 16. Therefore, "1" is outputted from the AND circuit 16 as an automatic turn-on command for the electric water supply pump x-2 seconds after the drum level returns to NWL-ymm.
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FCB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 FCB occurs can be briefly explained as follows.
FCB発生
FCB発生から10秒以内にドラムレベルが
NWL−ｚmm以下になつたら、タービン駆動給
水ポンプをＷ ｔ／ｈで駆動
ドラムレベルがNWL−ｙmmまで復帰したら
ｘ−２秒後に電動給水ポンプをサービスインす
るとともに、ｘ秒後にタービン駆動給水ポンプ
の給水量指令値を漸減させる
以上説明したようにこの発明によれば、FCB
が発生したとき、ドラムレベルがあるレベル−ｚ
mmよりも低くなつたら、タービン駆動給水ポンプ
により、ドラム内に大流量で給水を行ない、ドラ
ムレベルがNWLに近いレベル−ｙmmまで復帰し
たらタービン駆動給水ポンプとは別個に設けた電
動給水ポンプを駆動するとともにタービン駆動給
水ポンプの給水量を漸減するようにしたので、
FCB時におけるドラムレベルの低下を早急かつ
正確に補償することができる。 FCB occurrence The drum level will increase within 10 seconds after FCB occurrence.
When the drum level falls below NWL-zmm, drive the turbine-driven water pump at W t/h. When the drum level returns to NWL-ymm, service the electric water pump after x-2 seconds, and turn the turbine-driven water pump back on after x seconds. As explained above, according to the present invention, the FCB
occurs, the drum level is at a certain level -z
When the drum level falls below NWL, a large flow of water is supplied into the drum using the turbine-driven water supply pump, and when the drum level returns to a level close to NWL - ymm, the electric water supply pump installed separately from the turbine-driven water supply pump is activated. At the same time, we gradually reduced the amount of water supplied by the turbine-driven water pump.
It is possible to quickly and accurately compensate for the drop in drum level during FCB.
第１図はこの発明の概要を説明するためのタイ
ムチヤート、第２図はこの発明の一実施例を示す
ブロツク図、第３図は第２図の回路の各部の動作
を示すタイムチヤートである。
２，１２，１５……遅延回路、１０……変化率
制限器。
Fig. 1 is a time chart for explaining the outline of the invention, Fig. 2 is a block diagram showing an embodiment of the invention, and Fig. 3 is a time chart showing the operation of each part of the circuit in Fig. 2. . 2, 12, 15...delay circuit, 10...change rate limiter.
Claims (1)
を入力しかつドラムレベルが規定値より−ｚmm以
下に下がつたことを検出してタービン駆動給水ポ
ンプによりドラムに大流量で給水を行ない、その
後規定値より−ｙmm（ｙ＜ｚ）以上に復帰したこ
とを検出して前記タービン駆動給水ポンプとは別
個に設けた電動給水ポンプによりドラムに小流量
の給水を行なうとともに、前記タービン駆動給水
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。1 Input a signal indicating the occurrence of FCB in the drum boiler, detect that the drum level has fallen below the specified value by -zmm, supply water to the drum at a large flow rate using the turbine-driven water pump, and then lower the level to -zmm below the specified value. When it is detected that the water has returned to ymm (y<z) or higher, a small flow rate of water is supplied to the drum by an electric water supply pump provided separately from the turbine-driven water supply pump, and the water supply amount of the turbine-driven water supply pump is gradually reduced. A water supply control method for a drum boiler, characterized in that:
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 JPS5913809A (en) | 1984-01-24 |
| JPH0231281B2 true 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) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4111834A (en) * | 1975-05-28 | 1978-09-05 | Imperial Chemical Industries Limited | Process for preparing a transition metal compound and it's use as a component in an olefin polymerization catalyst |
| 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
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5913809A (en) | 1984-01-24 |
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