JP2522477B2 - Boiler feed pump shaft seal water control system - Google Patents
Boiler feed pump shaft seal water control systemInfo
- Publication number
- JP2522477B2 JP2522477B2 JP62139131A JP13913187A JP2522477B2 JP 2522477 B2 JP2522477 B2 JP 2522477B2 JP 62139131 A JP62139131 A JP 62139131A JP 13913187 A JP13913187 A JP 13913187A JP 2522477 B2 JP2522477 B2 JP 2522477B2
- Authority
- JP
- Japan
- Prior art keywords
- pump
- condensate
- water
- pressure
- shaft sealing
- 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 - Fee Related
Links
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
- Mechanical Sealing (AREA)
Description
【発明の詳細な説明】 〔発明の目的〕 （産業上の利用分野） 本発明は、ボイラ給水ポンプに軸封水を効率よく供給
できるようにした軸封水制御システムに関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a shaft sealing water control system capable of efficiently supplying shaft sealing water to a boiler feed pump.
（従来の技術） 一般に、ポンプの軸がケーシングを貫通する部分はグ
ランド部と言われ、このグランド部には内部流体が外部
に噴出するのを防止するため、シールが設けられる。こ
のシールの方式としては、グランドパッキン、メカニカ
ルシール、スロットルブッシュ、フローティングリング
などポンプの機種や型式に応じて種々のものが用いられ
るが、汽力発電プラントにおけるボイラ給水ポンプは、
その取扱い流体が高温・高圧であるところから、スロッ
トルブッシュ方式が採用されることが多い。(Prior Art) Generally, a portion where a shaft of a pump penetrates a casing is called a gland portion, and a seal is provided in the gland portion in order to prevent the internal fluid from being ejected to the outside. As the sealing method, various types such as a gland packing, a mechanical seal, a throttle bush, and a floating ring are used according to the model and model of the pump, but a boiler feed pump in a steam power plant is
Since the fluid to be handled is high temperature and high pressure, the throttle bush method is often adopted.
このスロットルブッシュ方式の軸封水部には外部から
の給水を必要とするが、汽力発電プラントでは通常、ボ
イラ給水ポンプの一次側で最も高圧の復水ブースタポン
プの吐出圧が使用され、また、復水ブースタポンプが設
置されていない亜臨界圧プラントの場合には復水ポンプ
の吐出圧が使用される。This throttle bush type shaft water seal part requires external water supply, but in a steam power plant, the discharge pressure of the condensate booster pump, which is the highest pressure on the primary side of the boiler feed water pump, is usually used. The discharge pressure of the condensate pump is used in the case of a subcritical pressure plant where the condensate booster pump is not installed.
第２図は従来のボイラ給水ポンプ軸封水制御システム
における復水および軸封水系統を示すもので、復水器１
で凝縮した復水は復水ポンプ２で昇圧され、復水処理装
置３およびグランド蒸気復水器４を経て、復水ブースタ
ポンプ５に送られ、そこで再度昇圧された後、低圧給水
加熱器６を通り、脱気器７へ送られる。FIG. 2 shows the condensate and shaft sealing system in the conventional boiler feed pump shaft sealing water control system.
The condensate condensed in 1. is boosted by the condensate pump 2, is sent to the condensate booster pump 5 via the condensate treatment device 3 and the gland steam condenser 4, and is again boosted there, and then the low-pressure feed water heater 6 And is sent to the deaerator 7.
脱気器７に一旦貯えられた復水は給水ブースタポンプ
８および給水ポンプ９により更に昇圧され、高圧給水加
熱器（図示せず）を経てボイラへ供給される。Condensed water once stored in the deaerator 7 is further boosted by the feed water booster pump 8 and the feed water pump 9, and is supplied to the boiler via a high pressure feed water heater (not shown).
復水ブースタポンプ５の吐出側配管から分岐して復水
器１に至る復水再循環管11の途中には復水再循環制御弁
12が介挿されている。A condensate recirculation control valve is provided in the middle of the condensate recirculation pipe 11 that branches from the discharge side pipe of the condensate booster pump 5 and reaches the condenser 1.
12 are inserted.
一般に、汽力発電プラントにおける100％負荷での脱
気器圧力は６〜9kg/cm2程度であり、これに給水ブース
タポンプ８の全揚程５〜10kg/cm2を加えると、給水ポン
プ入口では約20kg/cm2程度の高圧となる。この高圧に打
勝って給水ポンプに軸封水を供給するため、復水ブース
タポンプ５の吐出圧が軸封水供給管21,21a,21bを通り、
軸封水制御弁22a,22bを介して給水ポンプ９のグランド
部に供給される。ポンプグランド部に入った軸封水は給
水ポンプの内部から流出してくる高温水と混合し、封水
戻り管23を経て封水回収タンク24に回収される。Generally, the deaerator pressure at 100% load in a steam power plant is about 6 to 9 kg / cm 2 , and if the total head of the feed water booster pump 8 is added to 5 to 10 kg / cm 2 , the deaerator pressure will be about the same at the feed pump inlet. High pressure of about 20 kg / cm 2 . In order to overcome this high pressure and supply the shaft seal water to the water supply pump, the discharge pressure of the condensate booster pump 5 passes through the shaft seal water supply pipes 21, 21a, 21b,
It is supplied to the gland portion of the water supply pump 9 through the shaft water sealing control valves 22a and 22b. The shaft sealing water that has entered the pump gland portion is mixed with the high temperature water flowing out from the inside of the water supply pump, and is collected in the sealing water recovery tank 24 via the sealing water return pipe 23.
軸封水制御弁22a,22bは封水温度検出装置25a,25bによ
って作動する封水温度調節計26a,26bからの信号によっ
て制御され、戻り温度を一定に調節する。The shaft sealing water control valves 22a, 22b are controlled by signals from the sealing water temperature controllers 26a, 26b operated by the sealing water temperature detecting devices 25a, 25b, and regulate the return temperature to be constant.
（発明が解決しようとする問題点） 上述のように構成した従来のボイラ給水ポンプの軸封
水制御システムにおいては、近年の汽力発電プラントの
運用の多用化に伴い、次のような問題点が生じてきた。(Problems to be Solved by the Invention) With the shaft sealing water control system for the conventional boiler feedwater pump configured as described above, the following problems are caused due to the recent diversification of operation of steam power generation plants. Has occurred.
即ち、最近の汽力発電プラントでは電力需要の多用化
に伴い、DSS運用プラントが急増してきている。このDSS
運用プラントは電力需要の多い昼間は負荷運転を行い、
電力需要の少ない夜間には運転を停止する多頻度起動停
止プラントであり、停止期間中においても、次の起動に
際して迅速に起動できるよう、復水器を真空状態に保持
しておく必要がある。この真空保持のためにはグランド
蒸気復水器４の蒸気冷却・凝縮用として復水を供給する
ため、復水際循環系統11を通して復水再循環運転を行う
必要があり、従って復水ポンプ２および復水ブースタポ
ンプ５は真空保持期間中、連続運転を続ける必要があ
る。その結果、損失（消費）動力は膨大なものとなる。That is, in recent steam power generation plants, the number of DSS operation plants is rapidly increasing due to the diversification of power demand. This DSS
The operating plant performs load operation during the daytime when there is a large demand for electricity,
It is a frequent start-stop plant that stops operation at night when power demand is low, and it is necessary to keep the condenser in a vacuum state so that it can be started quickly during the next start even during the stop period. Condensate is supplied for steam cooling / condensation of the gland steam condenser 4 to maintain this vacuum, and therefore it is necessary to perform a condensate recirculation operation through the condensate circulation system 11, and therefore the condensate pump 2 and The condensate booster pump 5 needs to be continuously operated during the vacuum holding period. As a result, loss (consumption) power becomes enormous.
そこで、最近では省エネルギー促進の一手法として、
上記ポンプのうち消費動力の大きい復水ブースタポンプ
５を停止し、復水ポンプ２のみによる復水再循環運転が
採用されつつある。Therefore, recently, as a method of promoting energy conservation,
Among the above pumps, the condensate booster pump 5, which consumes a large amount of power, is stopped, and the condensate recirculation operation using only the condensate pump 2 is being adopted.
しかしながら、この復水ポンプのみによる復水再循環
運転に際しては、給水ポンプ９の軸封水が充分に確保さ
れなくなるという問題を生ずる。これは、復水ブースタ
ポンプ５が停止しているために軸封水として必要な圧力
が充分に確保できなくなるためである。そこで、省エネ
ルギーを犠牲にして復水ブースタポンプの運転を続行す
るか、あるいは別の封水ポンプを設置して運転する等の
対応策を強いられ、省エネルギー効果を著しく低下させ
るという欠点があった。However, in the condensate recirculation operation using only this condensate pump, there arises a problem that the shaft sealing water of the water supply pump 9 cannot be sufficiently secured. This is because the condensate booster pump 5 is stopped and the pressure required for shaft sealing water cannot be sufficiently secured. Therefore, there has been a drawback that energy saving is sacrificed and the condensate booster pump is continuously operated, or another sealing water pump is installed and operated, and the energy saving effect is significantly reduced.
このような問題は、亜臨界圧プラントのみならず超臨
界圧大容量プラントまでもがDSS運用されている昨今で
は、早急に改善すべき重要課題である。Such a problem is an important issue that needs to be urgently improved in recent years when not only subcritical pressure plants but also supercritical pressure large capacity plants are operated by DSS.
（発明の目的） 本発明は従来技術における上述のごとき欠点を解決す
べくなされたもので、通常運転中は従来通り安定した軸
封水を供給し、かつ、真空維持中に復水ブースタポンプ
を停止しても軸封水を安定して供給できるボイラ給水ポ
ンプの軸封水制御システムを提供することを目的とする
ものである。(Object of the invention) The present invention has been made to solve the above-mentioned drawbacks in the prior art, and supplies stable shaft sealing water as usual during normal operation, and a condensate booster pump during vacuum maintenance. It is an object of the present invention to provide a shaft sealing water control system for a boiler feed water pump that can stably supply shaft sealing water even when stopped.
（問題点を解決するための手段） 上記目的を達成するため、本発明のボイラ給水ポンプ
の軸封水制御システムは、復水器から供給される復水を
昇圧させる復水ポンプと、この復水ポンプによって昇圧
された復水をさらに昇圧してボイラ給水ポンプに供給す
る復水ブースタポンプとを有し、前記復水ブースタポン
プを停止させる際には前記復水ポンプが復水を循環させ
るように構成されているプラントの、前記給水ポンプの
軸封部に供給する軸封水を制御するシステムであって、
前記復水ブースタポンプによって昇圧された復水の一部
を前記ボイラ給水ポンプの軸封部に供給する、管路の途
中に逆止弁が設けられた高圧軸封水供給管と、前記復水
ポンプによって昇圧された復水の一部を前記ボイラ給水
ポンプの軸封部に供給する、前記逆止弁よりも下流側に
おいて前記高圧軸封水供給管に接続され、かつ管路の途
中に逆止弁が設けられた低圧軸封水供給管とを備え、前
記低圧軸封水供給管によって供給される軸封水の元圧
は、前記ボイラ給水ポンプからボイラに供給される復水
の流量が所定の値よりも多い場合の軸封水注入所要圧力
よりは低いが、前記流量が前記所定の値より少ない場合
の軸封水注入所要圧力よりは高くされていることを特徴
とする。(Means for Solving Problems) In order to achieve the above object, a shaft water sealing control system for a boiler feed water pump according to the present invention includes a condensate pump for increasing the pressure of condensate supplied from a condenser, and the condensate pump. A condensate booster pump that further increases the pressure of the condensate boosted by the water pump and supplies it to the boiler feed water pump, and when the condensate booster pump is stopped, the condensate pump circulates the condensate. A system for controlling the shaft sealing water supplied to the shaft sealing part of the water supply pump of the plant configured in
A high pressure shaft seal water supply pipe provided with a check valve in the middle of the pipeline for supplying a part of the condensate water pressurized by the condensate booster pump to the shaft seal portion of the boiler feed water pump; A part of the condensate water pressurized by the pump is supplied to the shaft sealing part of the boiler water supply pump, which is connected to the high pressure shaft sealing water supply pipe on the downstream side of the check valve, and is reversely connected in the middle of the pipeline. A low pressure shaft sealing water supply pipe provided with a stop valve, the source pressure of the shaft sealing water supplied by the low pressure shaft sealing water supply pipe is the condensate flow rate supplied to the boiler from the boiler feed pump. The pressure is lower than the shaft sealing water injection required pressure when the flow rate is higher than a predetermined value, but is higher than the shaft sealing water injection required pressure when the flow rate is lower than the predetermined value.
（作 用） 上記のように構成した本発明のシステムにおいては、
ボイラ給水ポンプが高負荷運転されて、ボイラ給水ポン
プからボイラに供給される復水の流量が所定の値よりも
多い場合には、軸封水注入所要圧力が低圧軸封水供給管
の元圧よりも高いので、ボイラ給水ポンプの軸封部へは
高圧軸封水供給管を介して高圧の軸封水が供給される。(Operation) In the system of the present invention configured as described above,
When the boiler feedwater pump is operated under high load and the flow rate of the condensate water supplied from the boiler feedwater pump to the boiler is higher than the specified value, the required pressure for the shaft seal water injection is the low pressure of the shaft seal water supply pipe. Therefore, the high pressure shaft seal water is supplied to the shaft seal portion of the boiler feed pump through the high pressure shaft seal water supply pipe.
この時、低圧軸封水供給管には逆止弁が設けられてい
るので、高圧軸封水供給管から供給される高圧の軸封水
が、低圧軸封水供給管を逆流することはない。At this time, since the low-pressure shaft sealing water supply pipe is provided with a check valve, high-pressure shaft sealing water supplied from the high-pressure shaft sealing water supply pipe does not flow backward through the low-pressure shaft sealing water supply pipe. .
これに対して、ボイラ給水ポンプが低負荷運転され若
しくは停止されて、ボイラ給水ポンプからボイラに供給
される復水の流量が所定の値よりも低くなった場合に
は、低圧軸封水供給管の元圧が軸封水注入所要圧力より
も高くなるため、低圧軸封水供給管からボイラ給水ポン
プの軸封部へ軸封水を供給することができ、ボイラ供給
ポンプの軸封部に供給する軸封水の供給元を、高圧軸封
水供給管から低圧軸封水供給管にスムーズに切り換える
ことができる。On the other hand, when the boiler feedwater pump is operated under a low load or is stopped and the flow rate of the condensate supplied from the boiler feedwater pump to the boiler becomes lower than the specified value, the low pressure shaft water supply pipe Since the source pressure of the pump becomes higher than the pressure required to inject the shaft sealing water, it is possible to supply the shaft sealing water from the low pressure shaft sealing water supply pipe to the shaft sealing part of the boiler feed pump, and to supply it to the shaft sealing part of the boiler supply pump. It is possible to smoothly switch the supply source of the shaft sealing water from the high pressure shaft sealing water supply pipe to the low pressure shaft sealing water supply pipe.
これにより、ボイラ給水ポンプの軸封部へ軸封水を供
給するために、復水ブースタポンプを運転する必要がな
いから、復水ブースタポンプの運転を停止させて消費動
力を大幅に減少させることができる。なお、高圧軸封水
供給管にも逆止弁が設けられているので、低圧軸封水供
給管から供給される低圧の軸封水が、高圧軸封水供給管
を逆流することはない。As a result, it is not necessary to operate the condensate booster pump in order to supply shaft seal water to the shaft seal part of the boiler feed water pump.Therefore, the condensate booster pump must be stopped to significantly reduce power consumption. You can Since the high-pressure shaft sealing water supply pipe is also provided with the check valve, the low-pressure shaft sealing water supplied from the low-pressure shaft sealing water supply pipe does not flow backward through the high-pressure shaft sealing water supply pipe.
（実施例） 以下、図面を参照して本発明の実施例を説明する。な
お、以下の説明では第２図におけると同一部分には同一
の符号を付し、相違点のみを説明する。Embodiments Embodiments of the present invention will be described below with reference to the drawings. In the following description, the same parts as those in FIG. 2 are designated by the same reference numerals, and only different points will be described.
第１図において、復水ブースタポンプ５には復水ブー
スタポンプバイパス弁30が並列に設けられている。In FIG. 1, the condensate booster pump 5 is provided with a condensate booster pump bypass valve 30 in parallel.
また、高圧軸封水供給管31から分岐して給水ポンプ９
の軸封水部に至る高圧軸封水供給管31a,31bの途中には
高圧軸封水制御弁32a,32bおよび逆止弁33a,33bが介挿さ
れている。Further, the water supply pump 9 is branched from the high pressure shaft water supply pipe 31.
High pressure shaft sealing water supply control valves 32a, 32b and check valves 33a, 33b are inserted in the middle of the high pressure shaft sealing water supply pipes 31a, 31b reaching the shaft sealing water portion.
一方、復水ポンプ２の吐出側に接続された低圧軸封水
供給管41からは低圧軸封水供給管41a,41bが分岐してお
り、これらの低圧軸封水供給管41a,41bの途中には低圧
軸封水制御弁42a,42bと逆止弁43a,43bが介挿されてい
る。低圧軸封水供給管41a,41bの下流端は逆止弁33a,33b
の下流側において高圧軸封水供給管31a,31bに合流し、
低温の軸封水を供給ポンプ９の軸封水部へ供給する。On the other hand, low-pressure shaft sealing water supply pipes 41a and 41b are branched from the low-pressure shaft sealing water supply pipe 41 connected to the discharge side of the condensate pump 2, and these low-pressure shaft sealing water supply pipes 41a and 41b are in the middle. The low-pressure shaft water sealing control valves 42a, 42b and the check valves 43a, 43b are inserted in this. Check valves 33a, 33b are provided at the downstream ends of the low pressure shaft water supply pipes 41a, 41b.
At the downstream side of the high pressure shaft sealing water supply pipe 31a, 31b,
The low temperature shaft sealing water is supplied to the shaft sealing water portion of the supply pump 9.
封水温度調節計26a,26bの出力は高圧軸封水制御弁32
a,32bのほか低圧軸封水制御弁42a,42bにも導かれ、これ
らの開度を制御する。The output of the sealing water temperature controller 26a, 26b is the high pressure shaft sealing water control valve 32.
In addition to a and 32b, the low pressure shaft water sealing control valves 42a and 42b are also guided to control their opening.
上述のように構成したボイラ給水ポンプの軸封水制御
システムにおいて、定常運転中でプラント負荷が高い場
合には、給水ポンプ９への軸封水は復水ブースタポンプ
５から高圧軸封水制御弁32a,32bと逆止弁33a,33bを通し
て供給されている。In the shaft sealing water control system for the boiler feed water pump configured as described above, when the plant load is high during steady operation, the shaft sealing water to the feed water pump 9 is supplied from the condensate booster pump 5 to the high pressure shaft sealing water control valve. It is supplied through 32a, 32b and check valves 33a, 33b.
第３図に負荷運転中および停止中における軸封水注入
所要圧力曲線ａ、高圧軸封水元圧（復水ブースタポンプ
出口圧力）曲線ｂ、低圧軸封水元圧（復水ポンプ出口圧
力）曲線ｃを示す。この図から明らかなように、流量QI
以上の運転域では、 低圧軸封水元圧Ｃ≦軸封水注入所要圧力ａ のため、低圧軸封水は低圧軸封水制御弁42a,42bが全開
となっても注入されず、高圧軸封水制御弁22a,22b側か
ら高圧の軸封水が供給される。Fig. 3 shows the shaft sealing water injection required pressure curve a, the high pressure shaft sealing water source pressure (condensate booster pump outlet pressure) curve b, and the low pressure shaft sealing water source pressure (condensate pump outlet pressure) during load operation and stop. A curve c is shown. As is clear from this figure, the flow rate QI
In the above operating range, the low-pressure shaft sealing water source pressure C ≤ the shaft-sealing water injection required pressure a, so the low-pressure shaft sealing water is not injected even when the low-pressure shaft sealing water control valves 42a, 42b are fully opened, and the high-pressure shaft is not injected. High-pressure shaft sealing water is supplied from the sealing water control valves 22a and 22b.
一方、負荷が低下し、流量Q1未満の運転域および停止
域では、 低圧軸封水元圧Ｃ＞軸封水注入所要圧力ａ となるため、低圧軸封水制御弁42a,42bによる低圧軸封
水が可能となる。On the other hand, in the operating range and the stop range where the load decreases and the flow rate is less than Q1, the low pressure shaft sealing water source pressure C> the shaft sealing water injection required pressure a, so the low pressure shaft sealing water control valves 42a, 42b are used. Water is possible.
特に、ユニットが停止すると、給水ブースタポンプ８
と給水ポンプ９が停止するため、注入所要圧力は給水ブ
ースタポンプ８の全揚程分だけ低くて済むことになる。Especially when the unit is stopped, the water supply booster pump 8
Since the water supply pump 9 is stopped, the required injection pressure can be reduced by the entire head of the water supply booster pump 8.
このように、本発明のボイラ給水ポンプ軸封水制御シ
ステムにおいては、低圧軸封水および高圧軸封水の圧力
の異なる２つの封水系統を備えているので、低速運転域
やユニット停止中においても、給水ポンプ封水系に封水
量不足などの異常を来たすことなく、復水ブースタポン
プを停止した状態で復水再循環運転を行うことができ
る。なお、この場合の復水は、復水器１→復水ポンプ２
→復水処理装置３−グランド蒸気復水器４→復水ブース
タポンプバイパス弁30→復水再循環管11→復水再循環制
御弁12→復水器１のループを循環することになる。As described above, the boiler feed water pump shaft water sealing control system of the present invention includes the two water sealing systems having different pressures for the low pressure shaft sealing water and the high pressure shaft sealing water. Also, the condensate recirculation operation can be performed with the condensate booster pump stopped without causing an abnormality such as insufficient amount of sealing in the water supply pump sealing system. In addition, the condensate in this case is the condenser 1 → condensate pump 2
→ Condensate treatment device 3-Grand steam condenser 4 → Condensate booster pump bypass valve 30 → Condensate recirculation pipe 11 → Condensate recirculation control valve 12 → Circulates through the loop of condenser 1.
（発明の効果） 上述のように、本発明のボイラ給水ポンプの軸封水制
御システムは、復水ブースタポンプから高圧の軸封水が
供給される高圧軸封水供給管と、復水ポンプから低圧の
軸封水が供給される低圧軸封水供給管とを備え、ボイラ
給水ポンプからボイラに供給される復水の流量が所定の
値よりも多い際には高圧軸封水供給管から、これとは反
対に前記流量が所定の値よりも低い際には低圧軸封水供
給管から、それぞれボイラ給水ポンプの軸封部に軸封水
が供給される構成とされている。(Effects of the Invention) As described above, the shaft sealing water control system for the boiler feed pump of the present invention includes a high pressure shaft sealing water supply pipe to which high pressure shaft sealing water is supplied from the condensate booster pump, and a condensate pump. A low-pressure shaft sealing water supply pipe to which low-pressure shaft sealing water is supplied, and from the high-pressure shaft sealing water supply pipe when the flow rate of condensed water supplied from the boiler water supply pump to the boiler is higher than a predetermined value, On the contrary, when the flow rate is lower than a predetermined value, the low pressure shaft sealing water supply pipe supplies the shaft sealing water to the shaft sealing portion of the boiler feed water pump.
これにより、本願発明によれば、ボイラ給水ポンプが
ボイラに供給する復水の流量が減少するに連れて、ボイ
ラ給水ポンプの軸封部に供給する軸封水の供給元を、高
圧軸封水供給管から低圧軸封水供給管にスムーズに切り
換えることができるから、ボイラ給水ポンプの軸封部に
供給する軸封水量の不足等の異常を来すことなく復水ブ
ースタポンプの運転を停止させ、復水ブースタポンプの
運転に伴う消費動力を大幅に減少させることができると
いう優れた効果を奏する。Thus, according to the present invention, as the flow rate of the condensate water supplied to the boiler by the boiler water supply pump decreases, the source of the shaft sealing water supplied to the shaft sealing portion of the boiler water supply pump is changed to the high pressure shaft sealing water. Since the supply pipe can be smoothly switched to the low-pressure shaft water supply pipe, the operation of the condensate booster pump can be stopped without causing an abnormality such as insufficient amount of shaft water supply to the shaft seal part of the boiler feed water pump. It has an excellent effect that the power consumption associated with the operation of the condensate booster pump can be significantly reduced.
即ち、例えばDSSプラントの年間の起動停止回数を200
回と仮定すると、一般にその90％以上が真空保持状態で
の停止であるので、真空保持運転時間の累計は年間で23
00時間程度となり、従って、600MWクラスの発電プラン
トでは数千万円にもおよぶエネルギーコストを節減する
ことができ、省エネルギーに大きく貢献することができ
る。That is, for example, set the number of times the DSS plant is
Assuming that the number of times is 90 times or more, generally 90% or more of them are stopped in the vacuum holding state, so the cumulative vacuum holding operating time is 23
It takes about 00 hours, and therefore, the energy cost of tens of millions of yen can be saved in a 600MW class power plant, which can greatly contribute to energy saving.
第１図は本発明のシステムの実施例を示すボイラ給水ポ
ンプの軸封水系統図、第２図は従来のボイラ給水ポンプ
の軸封水系統図、第３図は本発明システムの作動を説明
する特性曲線図である。 １……復水器、２……復水ポンプ、３……復水処理装
置、４……グランド蒸気復水器、５……復水ブースタポ
ンプ、６……低圧ヒータ、７……脱気器、８……給水ブ
ースタポンプ、９……給水ポンプ、11……復水再循環
管、12……復水再循環制御弁、21,21a,21b……軸封水供
給管、22a,22b……軸封水制御弁、23……軸封水戻り
管、24……封水回収タンク、25a,25b……封水温度検出
装置、26a,26b……復水温度調節計、30……復水ブース
タポンプバイパス弁、31,31a,31b……高圧軸封水供給
管、32a,32b……高圧軸封水制御弁、33a,33b……逆止
弁、41,41a,41b……低圧軸封水供給管、42a,42b……低
圧軸封水制御弁、43a,43b……逆止弁。FIG. 1 is a shaft water supply system diagram of a boiler feed water pump showing an embodiment of the system of the present invention, FIG. 2 is a shaft water supply system diagram of a conventional boiler water supply pump, and FIG. It is a characteristic curve figure to do. 1 ... Condenser, 2 ... Condensate pump, 3 ... Condensate treatment device, 4 ... Grand steam condenser, 5 ... Condensate booster pump, 6 ... Low pressure heater, 7 ... Deaeration Vessel, 8 …… Water supply booster pump, 9 …… Water supply pump, 11 …… Condensate recirculation pipe, 12 …… Condensate recirculation control valve, 21, 21a, 21b …… Shaft sealing water supply pipe, 22a, 22b ...... Shaft sealing water control valve, 23 ...... Shaft sealing water return pipe, 24 ...... Sealing water recovery tank, 25a, 25b ...... Sealing water temperature detection device, 26a, 26b ...... Condensate temperature controller, 30 ...... Condensate booster pump bypass valve, 31,31a, 31b ...... High pressure shaft sealing water supply pipe, 32a, 32b ...... High pressure shaft sealing water control valve, 33a, 33b ...... Check valve, 41,41a, 41b ...... Low pressure Shaft sealing water supply pipes, 42a, 42b ...... Low pressure shaft sealing water control valves, 43a, 43b ...... Check valves.
Claims (1)
水ポンプと、この復水ポンプによって昇圧された復水を
さらに昇圧してボイラ給水ポンプに供給する復水ブース
タポンプとを有し、前記復水ブースタポンプを停止させ
る際には前記復水ポンプが復水を循環させるように構成
されているプラントの、前記給水ポンプの軸封部に供給
する軸封水を制御するシステムであって、前記復水ブー
スタポンプによって昇圧された復水の一部を前記ボイラ
給水ポンプの軸封部に供給する、管路の途中に逆止弁が
設けられた高圧軸封水供給管と、前記復水ポンプによっ
て昇圧された復水の一部を前記ボイラ給水ポンプの軸封
部に供給する、前記逆止弁よりも下流側において前記高
圧軸封水供給管に接続され、かつ管路の途中に逆止弁が
設けられた低圧軸封水供給管とを備え、前記低圧軸封水
供給管によって供給される軸封水の元圧は、前記ボイラ
給水ポンプからボイラに供給される復水の流量が所定の
値よりも多い場合の軸封水注入所要圧力よりは低いが、
前記流量が前記所定の値よりも少ない場合の軸封水注入
所要圧力よりは高くされていることを特徴とするボイラ
給水ポンプの軸封水制御システム。1. A condensate pump for increasing the pressure of condensate supplied from a condenser, and a condensate booster pump for further increasing the pressure of the condensate boosted by this condensate pump and supplying it to a boiler feed pump. However, in a plant configured to circulate condensate when the condensate booster pump is stopped, a system for controlling shaft sealing water supplied to the shaft sealing part of the water supply pump. There is a high-pressure shaft sealing water supply pipe provided with a check valve in the middle of the pipeline for supplying a part of the condensate water pressurized by the condensate booster pump to the shaft sealing portion of the boiler feed water pump, A part of the condensate water pressurized by the condensate pump is supplied to the shaft seal part of the boiler water supply pump, which is connected to the high pressure shaft seal water supply pipe on the downstream side of the check valve, Low pressure shaft with a check valve in the middle The low pressure shaft water supply pipe is provided with a water supply pipe, and the source pressure of the shaft sealing water supplied by the low pressure shaft water supply pipe is the shaft when the flow rate of the condensed water supplied from the boiler water supply pump to the boiler is larger than a predetermined value. Lower than the pressure required to fill the seal water,
A shaft sealing water control system for a boiler feedwater pump, wherein the pressure is set higher than a required pressure for shaft sealing water injection when the flow rate is smaller than the predetermined value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62139131A JP2522477B2 (en) | 1987-06-03 | 1987-06-03 | Boiler feed pump shaft seal water control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62139131A JP2522477B2 (en) | 1987-06-03 | 1987-06-03 | Boiler feed pump shaft seal water control system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63302202A JPS63302202A (en) | 1988-12-09 |
| JP2522477B2 true JP2522477B2 (en) | 1996-08-07 |
Family
ID=15238250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62139131A Expired - Fee Related JP2522477B2 (en) | 1987-06-03 | 1987-06-03 | Boiler feed pump shaft seal water control system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2522477B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107165854B (en) * | 2017-05-08 | 2023-11-14 | 华电电力科学研究院有限公司 | Automatic control and recovery device for sealing water of water supply pump |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5521242B2 (en) * | 1974-06-07 | 1980-06-09 |
-
1987
- 1987-06-03 JP JP62139131A patent/JP2522477B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63302202A (en) | 1988-12-09 |
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