JPS6261877B2 - - Google Patents
Info
- Publication number
- JPS6261877B2 JPS6261877B2 JP18885681A JP18885681A JPS6261877B2 JP S6261877 B2 JPS6261877 B2 JP S6261877B2 JP 18885681 A JP18885681 A JP 18885681A JP 18885681 A JP18885681 A JP 18885681A JP S6261877 B2 JPS6261877 B2 JP S6261877B2
- Authority
- JP
- Japan
- Prior art keywords
- water level
- condenser
- flow rate
- condensate
- regulating valve
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 72
- 230000001105 regulatory effect Effects 0.000 claims description 16
- 230000001276 controlling effect Effects 0.000 claims description 2
- 230000007423 decrease Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B11/00—Controlling arrangements with features specially adapted for condensers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Non-Electrical Variables (AREA)
Description
【発明の詳細な説明】
発明の技術分野
本発明は、蒸気タービンプラントにおける復水
器水位制御装置に関する。TECHNICAL FIELD OF THE INVENTION The present invention relates to a condenser water level control device in a steam turbine plant.
発明の技術的背景およびその問題点
近年、超々高圧、高温化された蒸気タービン
や、ガスタービンと蒸気タービンによるコンバイ
ンドプラント等の復水器も、蒸気量の減少や外形
寸法の縮小化により小さくなつてきている。とこ
ろで、復水器において復水を一時的に貯溜するホ
ツトウエル内の水位が高水位になりすぎると、蒸
気タービン排気の蒸気を海水等を用いて冷却する
冷却水チユーブが復水中に埋没し、真空度の低下
現象を招き、一方低水位になりすぎると、復水ポ
ンプの必要正味吸込水頭の減少となり、ポンプ内
部にてキヤビテーシヨン等を発生し、重大事故に
到る可能性がある。そこで、一般に復水器にはホ
ツトウエル内の水位を一定にするための復水器水
位制御装置が設けられている。ところが前述の如
く復水器が縮小化されると、ホツトウエルも小さ
くなり必然的に水位の制御面積が減少し、流量と
御制面積の不均衡による水位制御の不安定化が生
ずるという不都合がある。Technical background of the invention and its problems In recent years, condensers for steam turbines with extremely high pressures and high temperatures, as well as for combined plants using gas turbines and steam turbines, have become smaller due to reductions in steam volume and external dimensions. It's coming. By the way, if the water level in the hotwell that temporarily stores condensate in a condenser becomes too high, the cooling water tube that cools the steam from the steam turbine exhaust using seawater etc. will be buried in the condensate, causing the vacuum On the other hand, if the water level becomes too low, the required net suction head of the condensate pump will decrease, causing cavitation etc. inside the pump, which may lead to a serious accident. Therefore, the condenser is generally provided with a condenser water level control device for keeping the water level in the hot well constant. However, as mentioned above, when the condenser is downsized, the hot well also becomes smaller and the water level control area inevitably decreases, resulting in an inconvenience in that water level control becomes unstable due to an imbalance between the flow rate and the control area. .
すなわち、第１図は従来の代表的な復水器水位
制御装置を示し、蒸気タービン１に連結された復
水器２には、復水ポンプ３によつてボイラ或は工
場プロセス等４に復水を送給する復水管路５が連
接されている。また、復水ポンプ３の下流側の復
水管路５から分岐された分岐管路６が、逃し調整
弁７を介して補給水タンク８に接続されており、
その補給水タンク８から導出された補給水管路９
が補給調整弁１０を介して復水器２に接続されて
いる。さらに、復水器ホツトウエルには、水位発
信器１１が設置されており、その水位発信器１１
からの出力信号を受けて、比例、積分および微分
の演算を行ない、逃し調整弁７または補給調整弁
１０に動作指令信号を発する水位調節計１２が設
けられている。 That is, FIG. 1 shows a typical conventional condenser water level control device, in which a condenser 2 connected to a steam turbine 1 is connected to a boiler or factory process 4 by a condensate pump 3. A condensate pipe 5 for supplying water is connected. Further, a branch pipe 6 branched from the condensate pipe 5 on the downstream side of the condensate pump 3 is connected to a make-up water tank 8 via a relief adjustment valve 7.
Make-up water pipe 9 led out from the make-up water tank 8
is connected to the condenser 2 via the replenishment regulating valve 10. Furthermore, a water level transmitter 11 is installed in the condenser hot well.
A water level controller 12 is provided which performs proportional, integral, and differential calculations upon receiving an output signal from the water level regulator 12 and issues an operation command signal to the relief regulating valve 7 or the replenishment regulating valve 10.
しかして、復水器ホツトウエル水位が標準水位
より低下したら、復水器２と補給水タンク８とを
連給している補給水管路９上に設けた補給調整弁
１０が開けられ、水位の回復が行なわれる。また
標準水位より異常に上昇したら、復水ポンプ３の
下流側の復水管路５から分岐し、補給水タンク８
と連結する分岐管路６に設けられた逃し調整弁７
が開けられ、水位が低下するように制御される。
この方式は、いわゆるスプリツトレンジ制御方式
と呼ばれているもので、その動作を第２図に示
す。第２図において横軸Lは、復水器水位を−100
〜０〜＋100％と示し、縦軸Ｖlは弁リフトを示し
ており、補給調整弁１０と逃し調整弁７の動作を
示している。 When the condenser water level drops below the standard water level, the make-up adjustment valve 10 provided on the make-up water pipe 9 that connects the condenser 2 and the make-up water tank 8 is opened, and the water level is restored. will be carried out. Also, if the water level rises abnormally above the standard level, the condensate pipe 5 on the downstream side of the condensate pump 3 is branched, and the make-up water tank 8
A relief adjustment valve 7 provided in the branch pipe line 6 connected to the
is opened and the water level is controlled to drop.
This method is called a split range control method, and its operation is shown in FIG. In Figure 2, the horizontal axis L represents the condenser water level by -100
It is shown as ~0 to +100%, and the vertical axis V l shows the valve lift, and shows the operation of the replenishment adjustment valve 10 and the relief adjustment valve 7.
ところが、このような装置においては単に水位
の変動によつて補給調整弁等を制御するので、そ
の水位の変動が大きく、殊にホツトウエルが小さ
なものにおいては、流入蒸気量の変動に対する水
位の変動が大きくなるため、水位の制御が困難と
なり、前述のように復水器の真空度の低下現象或
は復水ポンプの必要正味吸込水頭の減少を招来す
る等の不都合がある。 However, in such a device, the replenishment adjustment valve etc. are controlled simply by fluctuations in the water level, so the fluctuations in the water level are large, and especially in those with a small hot well, the fluctuation in the water level in response to the fluctuation in the amount of steam flowing in is difficult. As it becomes larger, it becomes difficult to control the water level, and as mentioned above, there are disadvantages such as a decrease in the degree of vacuum in the condenser or a decrease in the necessary net suction head of the condensate pump.
発明の目的
本発明はこのような点に鑑み、復水器の水位変
動幅を小さくすることができ、水位の安定化を図
ることができる復水器水位制御装置を提供するこ
とを目的とする。Purpose of the Invention In view of the above, an object of the present invention is to provide a condenser water level control device that can reduce the range of water level fluctuation in the condenser and stabilize the water level. .
発明の概要
本発明は、復水器への流入蒸気量、ホツトウエ
ルへの補給水流量ならびに復水器から流出する復
水流量をそれぞれ計測する流量発信器と、各流量
発信器からの信号によつてホツトウエル内への復
水の流入量と流出量との不平衡を先行信号として
発信する演算器とを設け、上記演算器からの出力
信号によつて前記復水逃し調整弁および補給調整
弁の開閉制御を行なうようにしたことを特徴とす
るものである。Summary of the Invention The present invention includes a flow rate transmitter that measures the amount of steam flowing into the condenser, the flow rate of make-up water to the hot well, and the flow rate of condensate flowing out from the condenser, and signals from each flow rate transmitter. A computing unit is provided which transmits an imbalance between the inflow and outflow of condensate into the hot well as a preliminary signal, and the output signal from the computing unit is used to control the condensate relief regulating valve and replenishment regulating valve. The feature is that opening/closing control is performed.
発明の実施例
以下第３図および第４図を参照して、本発明の
一実施例について説明する。なお、第１図と同一
部分については、同一符号を付しその説明を省略
する。Embodiment of the Invention An embodiment of the invention will be described below with reference to FIGS. 3 and 4. Note that the same parts as in FIG. 1 are given the same reference numerals, and the explanation thereof will be omitted.
第３図において、蒸気タービン１には蒸気ター
ビン１の駆動蒸気である主蒸気２１の流量を計測
する主蒸気流量発信器１３と、副蒸気２２の流量
を計測する副蒸気流量発信器１４と、蒸気タービ
ン１の途中段落から抽気して図示しない熱交換器
の加熱或は工場プロセス用として供給する抽気２
３の蒸気量を計測する抽気流量発信器１５が配設
されている。また、復水管路５には復水ポンプ３
の吐出復水量を計測する復水流量発信器１６が配
設されており、さらに補給水管路９には、補給水
タンク８から復水器２へ補給する補給水量を計測
する補給水流量発信器１７が配設されている。と
ころで、上記各発信器１３，１４，１５，１６，
１７からの信号は、その各信号を入力して演算を
行なう演算器１８に印加され、その演算器１８か
らの出力信号が水位調節計１２に加えられて、そ
れによつて逃し調整弁７或は補給調整弁１０の開
閉制御を行なうようにしてある。 In FIG. 3, the steam turbine 1 includes a main steam flow rate transmitter 13 that measures the flow rate of main steam 21, which is the driving steam of the steam turbine 1, and an auxiliary steam flow rate transmitter 14 that measures the flow rate of the auxiliary steam 22. Extracted air 2 extracted from a mid-stage of the steam turbine 1 and supplied for heating a heat exchanger (not shown) or for factory processes
A bleed air flow rate transmitter 15 for measuring the amount of steam at No. 3 is provided. In addition, the condensate pump 3 is connected to the condensate pipe line 5.
A condensate flow rate transmitter 16 for measuring the amount of condensate discharged is disposed, and a make-up water flow rate transmitter 16 for measuring the amount of make-up water to be supplied from the make-up water tank 8 to the condenser 2 is disposed in the make-up water pipe 9. 17 are arranged. By the way, each of the above transmitters 13, 14, 15, 16,
The signals from 17 are applied to a computing unit 18 which inputs each signal and performs calculations, and the output signal from the computing unit 18 is applied to the water level controller 12, thereby controlling the relief regulating valve 7 or The opening and closing of the replenishment regulating valve 10 is controlled.
しかして、主蒸気流量発信器１３、副蒸気流量
発信器１４、抽気流量発信器１５、復水流量発信
器１６および補給水流量発信器１７からの各発信
信号B1，B2，B3，B4，B5が演算器１８に印加さ
れ、そこで復水器に対する復水の流入量と流出量
の演算が行なわれ、その流入量と流出量との不平
衡による先行制御信号が水位調節計１２に出力さ
れる。一方、復水器水位の実水位も水位発信器１
１で検出され、その信号Ａも演算器１８に入力さ
れ、そこで標準水位との偏差が演算され、その偏
差信号も水位調節計１２へ印加される。 Thus, the respective transmission signals B 1 , B 2 , B 3 , B 4 and B 5 are applied to the calculator 18, where the inflow and outflow amounts of condensate to the condenser are calculated, and a preliminary control signal due to the imbalance between the inflow and outflow amounts is sent to the water level controller. 12 is output. On the other hand, the actual water level of the condenser water level is also indicated by the water level transmitter 1.
The signal A is also input to the calculator 18, where the deviation from the standard water level is calculated, and the deviation signal is also applied to the water level controller 12.
したがつて、上記水位調節計１２は、水位低が
予想されるならば補給調整弁１０を開けるよう
な、また水位高が予想されるならば逃し調整弁７
を開けるような信号が制御信号として発せられ
る。この動作は第２図に示すものと同一である。
ここで流量不均衡を式を用いて説明すると、流入
量（主蒸気流量信号B1＋副蒸気流量信号B3＋補
給水流量信号B5）−流出量（抽出流量信号B2＋復
水流量信号B4）となり、この流入量と流出量の平
衡度がくずれると、必らず水位の変化として表わ
れる。しかして、本発明においては、この平衡度
のくずれを検出して、直ちに先行的補給調整弁ま
たは逃し調整弁が開閉制御されるので、水位変化
が小さく維持される。また、実水位の変動幅が小
さい場合でも標準水位との偏差がつづけば、水位
信号によつて各調整弁の開度が制御され水位の補
正が行なわれる。 Therefore, the water level controller 12 is configured to open the replenishment adjustment valve 10 if a low water level is expected, and to open the relief adjustment valve 7 if a high water level is expected.
A signal to open the door is issued as a control signal. This operation is the same as that shown in FIG.
Here, to explain the flow imbalance using a formula, the inflow amount (main steam flow rate signal B 1 + sub-steam flow rate signal B 3 + make-up water flow rate signal B 5 ) - outflow amount (extraction flow rate signal B 2 + condensate flow rate If the balance between the inflow and outflow is disrupted , this will necessarily appear as a change in the water level. According to the present invention, this imbalance is detected and the advance replenishment regulating valve or relief regulating valve is immediately controlled to open or close, so that changes in water level are kept small. Furthermore, even if the fluctuation range of the actual water level is small, if the deviation from the standard water level continues, the opening degree of each regulating valve is controlled by the water level signal to correct the water level.
発明の効果
以上説明したように、本発明においては復水器
への流入蒸気量、ホツトウエルへの補給水量なら
びに復水器から流出する復水流量をそれぞれ計測
する流量発信器と、各流量発信器からの信号によ
つてホツトウエル内への復水の流入量と流出量と
の不平衡を先行信号として発信する演算器とを設
け、その演算器からの信号によつて逃し調整弁或
は補給調整弁を開閉制御するようにしたので、水
位変動に先行して上記両調整弁の一方が制御さ
れ、水位変動幅が小さく押えられ、水位の安定化
が行なわれる。したがつて水位が急に上昇して冷
却水チユーブが復水中に埋没して真空度の低下現
象を招いたり、或は低水位になりすぎて復水ポン
プの必要正味吸込水頭の減少が生ずるようなこと
が確実に防止される等の効果を奏する。Effects of the Invention As explained above, the present invention provides a flow rate transmitter that measures the amount of steam flowing into the condenser, the amount of make-up water to the hot well, and the flow rate of condensate flowing out from the condenser, and each flow rate transmitter. A computing unit is provided which sends an advance signal indicating the unbalance between the inflow and outflow of condensate into the hot well based on the signal from the computing unit, and the relief adjustment valve or replenishment adjustment is performed based on the signal from the computing unit. Since the valves are controlled to open and close, one of the above-mentioned regulating valves is controlled prior to the water level fluctuation, so that the width of the water level fluctuation is kept small and the water level is stabilized. Therefore, the water level may rise suddenly and the cooling water tube is buried in condensate, causing a decrease in the degree of vacuum, or the water level may become too low, causing a decrease in the required net suction head of the condensate pump. This has the effect of reliably preventing such occurrences.
第１図は従来の復水器水位制御装置概略系統
図、第２図は復水器水位制御装置の水位と調整弁
の関連説明線図、第３図は本発明の一実施例によ
る復水器水位制御装置概略系統図、第４図は演算
器への入力信号説明図である。
２……復水器、３……復水ポンプ、７……逃し
調整弁、１０……補給調整弁、１１……水位発信
器、１２……水位調節計、１３……主蒸気流量発
信器、１４……副蒸気流量発信器、１５……抽気
流量発信器、１６……復水流量発信器、１７……
補給水流量発信器、１８……演算器。
Fig. 1 is a schematic system diagram of a conventional condenser water level control device, Fig. 2 is an explanatory diagram related to the water level of the condenser water level control device and a regulating valve, and Fig. 3 is a condenser water level control system according to an embodiment of the present invention. FIG. 4 is a schematic system diagram of the water level control device, and FIG. 4 is an explanatory diagram of input signals to the arithmetic unit. 2... Condenser, 3... Condensate pump, 7... Relief adjustment valve, 10... Replenishment adjustment valve, 11... Water level transmitter, 12... Water level controller, 13... Main steam flow rate transmitter , 14...Sub-steam flow rate transmitter, 15...Bleed air flow rate transmitter, 16...Condensate flow rate transmitter, 17...
Make-up water flow rate transmitter, 18...computer.
Claims (1)
弁および補給調整弁の制御によつて標準水位に維
持せしめるようにした復水器水位制御装置におい
て、復水器への流入蒸気量、ホツトウエルへの補
給水流量ならびに復水器から流出する復水流量を
それぞれ計測する流量発信器と、各流量発信器か
らの信号によつてホツトウエル内への復水の流入
量と流出量との不平衡を先行信号として発信する
演算器とを設け、上記演算器からの出力信号によ
つて前記復水逃し調整弁および補給調整弁の開閉
制御を行なうようにしたことを特徴とする、復水
器水位制御装置。1 In a condenser water level control device that maintains the water level in the condenser hotwell at a standard water level by controlling the condensate relief regulating valve and the replenishment regulating valve, the amount of steam flowing into the condenser and the hotwell are controlled. A flow rate transmitter measures the make-up water flow rate and the condensate flow rate flowing out from the condenser, and the unbalance between the inflow and outflow of condensate into the hot well is detected by the signals from each flow rate transmitter. A condenser water level control comprising: a computing unit that transmits a preceding signal; and an output signal from the computing unit controls opening and closing of the condensate relief regulating valve and the replenishment regulating valve. Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18885681A JPS5892797A (en) | 1981-11-25 | 1981-11-25 | Water level controlling device for condenser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18885681A JPS5892797A (en) | 1981-11-25 | 1981-11-25 | Water level controlling device for condenser |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5892797A JPS5892797A (en) | 1983-06-02 |
| JPS6261877B2 true JPS6261877B2 (en) | 1987-12-23 |
Family
ID=16231044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18885681A Granted JPS5892797A (en) | 1981-11-25 | 1981-11-25 | Water level controlling device for condenser |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5892797A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5014260B2 (en) | 2008-05-30 | 2012-08-29 | 富士フイルム株式会社 | Cooling system |
-
1981
- 1981-11-25 JP JP18885681A patent/JPS5892797A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5892797A (en) | 1983-06-02 |
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