JPS6134042B2 - - Google Patents
Info
- Publication number
- JPS6134042B2 JPS6134042B2 JP1606179A JP1606179A JPS6134042B2 JP S6134042 B2 JPS6134042 B2 JP S6134042B2 JP 1606179 A JP1606179 A JP 1606179A JP 1606179 A JP1606179 A JP 1606179A JP S6134042 B2 JPS6134042 B2 JP S6134042B2
- Authority
- JP
- Japan
- Prior art keywords
- deaerator
- line
- valve
- condensate
- bypass
- 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 23
- 230000002265 prevention Effects 0.000 claims description 2
- 239000012530 fluid Substances 0.000 description 8
- 230000007423 decrease Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
Landscapes
- Engine Equipment That Uses Special Cycles (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Description
【発明の詳細な説明】
本発明は、負荷遮断時における脱気器圧力低下
防止装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a deaerator pressure drop prevention device during load shedding.
第１図は従来の蒸気タービンプラントの要部系
統図を示し、脱気器１は第１ライン２を介して復
水器（図示せず）に接続されていると共に貯水タ
ンク３及び第２ライン４を介して給水ポンプ５に
接続され、またこの脱気器には第３ライン６を介
して加熱蒸気が送られ、この蒸気によつて復水を
直接加熱し、復水中の溶存ガスを物理的に分離除
去している。 FIG. 1 shows a system diagram of main parts of a conventional steam turbine plant, in which a deaerator 1 is connected to a condenser (not shown) via a first line 2, and a water storage tank 3 and a second line. This deaerator is connected to a water supply pump 5 via a third line 6, and heated steam is sent to this deaerator via a third line 6, which directly heats the condensate and physically removes the dissolved gas in the condensate. It is separated and removed.
そして、このような系統において、給水ポンプ
の有効正味押込高さAv.NPSH（Available Net
Positive Suction Head）は次式で表わされ、給
水ポンプがキヤビテーシヨンなしに運転されるた
めにはAv.NPSHが必要正味押込高さReq.NPSH
（Requisite Net Positive Suction Head）よりも
大きいことが必要である。 In such a system, the effective net pushing height of the water pump, Av.NPSH (Available Net
Positive Suction Head) is expressed by the following formula, and in order for the water supply pump to operate without cavitation, Av.NPSH is required. Net suction height Req.NPSH
(Requisite Net Positive Suction Head).
Av.NPSH＝Pd＋Ｈ−Ps−ΔＰ
この式において、Pdは脱気器圧力、Ｈは脱気
器貯水タンク及び給水ポンプ間の静水頭、Psは
給水ポンプ入口流体の飽和圧力、及びΔＰは脱気
器や給水ポンプ間の圧力損失である。 Av.NPSH=Pd+H-Ps-ΔP In this equation, Pd is the deaerator pressure, H is the hydrostatic head between the deaerator storage tank and the feed pump, Ps is the saturation pressure of the feed pump inlet fluid, and ΔP is the deaerator pressure. This is the pressure loss between the equipment and the water supply pump.
したがつて、通常運転のみを考えれば、Pd≒
Ps′であるので、Ｈ＞Req.NPSH＋ΔＰとなるよ
うな高さに脱気器を据え付ければ良いことにな
る。 Therefore, if we consider only normal operation, Pd≒
Since Ps', it is sufficient to install the deaerator at a height such that H>Req.NPSH+ΔP.
しかるに、タービンの負荷遮断が起きたときに
は、脱気器へ送られている加熱蒸気がタービンよ
りの抽出であるので脱気器への加熱蒸気の供給が
途絶えるが復水はそのまま脱気器へ流れ込むた
め、脱気器圧力が急激に低下し、Av.NPSHが減
少する事態が生ずる。 However, when a turbine load interruption occurs, the heating steam sent to the deaerator is extracted from the turbine, so the supply of heating steam to the deaerator is interrupted, but the condensate flows directly into the deaerator. Therefore, a situation occurs in which the deaerator pressure decreases rapidly and Av.NPSH decreases.
このため、従来は、負荷遮断時におけるAv.
NPSH低下を計算し、負荷遮断時でも給水ポンプ
の運転に支障がないよう換言すればキヤビテーシ
ヨンが起らないようにＨを大きくとつている。 For this reason, conventionally, the Av.
By calculating the NPSH drop, H is set large so that there is no problem in the operation of the water supply pump even when the load is cut off, or in other words, cavitation does not occur.
しかし、脱気器の据え付け高さを高くすればタ
ービン建屋の建設費用が高くなる問題があり、一
方脱気器の据え付け高さを制限すれば、Req.
NPSHの小さい給水ポンプを設置する必要があ
り、コストアツプの要因となる問題があつた。 However, if the installation height of the deaerator is increased, there is a problem that the construction cost of the turbine building will increase.On the other hand, if the installation height of the deaerator is restricted, Req.
It was necessary to install a water pump with a small NPSH, which caused a problem that increased costs.
本発明は、このような従来の問題を解消し脱気
器がタービン建屋設計上の制限とならぬようにし
たものであつて、復水遮断弁を設置して負荷遮断
後に脱気器への復水の流入を遮断するようにした
こと及び脱気器バイパスラインを設置して給水ポ
ンプ入口流体の飽和圧力を低下させAv.NPSHの
減少を防止するようにしたことを特徴とする。 The present invention solves these conventional problems and prevents the deaerator from becoming a limitation in turbine building design.The present invention installs a condensate cutoff valve to prevent the deaerator from being connected to the deaerator after the load is cut off. It is characterized by blocking the inflow of condensate and installing a deaerator bypass line to lower the saturation pressure of the fluid at the water pump inlet to prevent a decrease in Av.NPSH.
以下第２図を参照して本発明の一実施例につい
て詳述する。 An embodiment of the present invention will be described in detail below with reference to FIG.
本発明にしたがつて、復水器７より脱気器１に
至る第１ライン２と脱気器１より給水ポンプ５に
至る第２ライン４との間には脱気器バイパスライ
ン８が設けられ、更に第１ライン２中には復水遮
断弁９及びそのバイパス弁１０が設けられている
と共に、脱気器バイパスライン８中には開閉弁１
１が設けられている。 According to the invention, a deaerator bypass line 8 is provided between the first line 2 from the condenser 7 to the deaerator 1 and the second line 4 from the deaerator 1 to the water pump 5. Furthermore, a condensate cutoff valve 9 and its bypass valve 10 are provided in the first line 2, and an on-off valve 1 is provided in the deaerator bypass line 8.
1 is provided.
復水遮断弁９はタービンの負荷遮断により自動
的に全閉するものであり、またバイパス弁１０は
復水遮断弁９が全閉した後この復水遮断弁を全開
に復帰させる時の均圧弁の役目を持つものであ
り、更に開閉弁１１は給水ポンプ入口流体の飽和
圧力を下げるために開かれて冷水を給水ポンプ入
口流体中に混入させるものである。 The condensate cutoff valve 9 is automatically fully closed when the load of the turbine is cut off, and the bypass valve 10 is a pressure equalization valve when the condensate cutoff valve 9 is returned to the fully open state after the condensate cutoff valve 9 is fully closed. Further, the on-off valve 11 is opened to reduce the saturation pressure of the water pump inlet fluid, and mix cold water into the water pump inlet fluid.
なお、第２図において、３は貯水タンク、６は
加熱蒸気供給ライン、１２は復水ポンプ、１３ａ
及び１３ｂは低圧給水加熱器である。 In addition, in FIG. 2, 3 is a water storage tank, 6 is a heating steam supply line, 12 is a condensate pump, and 13a
and 13b is a low pressure feed water heater.
次にその作用について説明する。タービンの負
荷遮断が起つたら、復水遮断弁９を全閉させ、こ
れにより脱気器１への復水の流入を遮断し脱気器
圧力低下を防ぐ。次に、開閉弁１１を除々に開ら
き冷水を給水ポンプ入口流体中に混入し、これに
より給水ポンプ入口流体の温度を除々に下げてそ
の飽和圧力を下げてやる。このようにして給水ポ
ンプ入口流体の温度が110℃位まで下つたら、バ
イパス弁１０を除々に開き、このバイパス弁１０
が全開したら復水遮断弁９を全開とする。開閉弁
１１は貯水タンク出口流体の温度が110℃前後に
なつたら全閉とする。 Next, its effect will be explained. When load cutoff of the turbine occurs, the condensate cutoff valve 9 is fully closed, thereby blocking the flow of condensate into the deaerator 1 and preventing a drop in deaerator pressure. Next, the on-off valve 11 is gradually opened to mix cold water into the feed water pump inlet fluid, thereby gradually lowering the temperature of the water pump inlet fluid and lowering its saturation pressure. When the temperature of the water supply pump inlet fluid drops to about 110°C in this way, the bypass valve 10 is gradually opened.
When fully opened, the condensate cutoff valve 9 is fully opened. The on-off valve 11 is fully closed when the temperature of the fluid at the outlet of the water storage tank reaches around 110°C.
このようにすることにより、給水ポンプの負荷
遮断時におけるAv.NPSH低下の検討を行うこと
なしに、単純に、脱気器及び給水ポンプ間の圧力
損失及び給水ポンプのReq.NPSHから脱気器据付
レベルを決定できかつそのレベルは従来よりも４
〜５ｍ低くすることができるなど種々の利点が得
られる。 By doing this, you can simply calculate the pressure loss between the deaerator and the water pump and the Req.NPSH of the water pump from the deaerator without considering the drop in Av. The installation level can be determined and the level is 4 higher than before.
Various advantages can be obtained, such as being able to lower the height by ~5 m.
なお、脱気器バイパスライン使用時にタービン
効率は下がるけれども短時間であるので問題ない
ものである。 Although the turbine efficiency decreases when the deaerator bypass line is used, it is only for a short time, so there is no problem.
本発明は、蒸気タービンプラント全般に応用で
き得ることは勿論である。 It goes without saying that the present invention can be applied to steam turbine plants in general.
第１図は従来例を示す蒸気タービンプラントの
要部系統図、第２図は本発明の一実施例を示す蒸
気タービンプラントの要部系統図である。
１……脱気器、２……第１ライン、４……第２
ライン、５……給水ポンプ、７……復水器、８…
…脱気器バイパスライン、９……復水遮断弁、１
０……バイパス弁、１１……開閉弁。
FIG. 1 is a system diagram of main parts of a steam turbine plant showing a conventional example, and FIG. 2 is a system diagram of main parts of a steam turbine plant showing an embodiment of the present invention. 1... Deaerator, 2... First line, 4... Second
Line, 5... Water pump, 7... Condenser, 8...
... Deaerator bypass line, 9 ... Condensate cutoff valve, 1
0...Bypass valve, 11...Open/close valve.
Claims (1)
器より給水ポンプに至る第２ラインとの間に脱気
器バイパスラインを設け、更に前記第１ライン中
には復水遮断弁及びそのバイパス弁を設けると共
に、前記脱気器バイパスライン中には開閉弁を設
けてなる負荷遮断時における脱気器圧力低下防止
装置。1. A deaerator bypass line is provided between a first line leading from the condenser to the deaerator and a second line leading from the deaerator to the water supply pump, and a condensate cutoff valve is further provided in the first line. and a deaerator pressure drop prevention device at the time of load cutoff, comprising a bypass valve thereof and an on-off valve in the deaerator bypass line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1606179A JPS55109706A (en) | 1979-02-16 | 1979-02-16 | Apparatus for preventing decreasing of pressure in deaerator at the time when load is disconnected |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1606179A JPS55109706A (en) | 1979-02-16 | 1979-02-16 | Apparatus for preventing decreasing of pressure in deaerator at the time when load is disconnected |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55109706A JPS55109706A (en) | 1980-08-23 |
| JPS6134042B2 true JPS6134042B2 (en) | 1986-08-05 |
Family
ID=11906051
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1606179A Granted JPS55109706A (en) | 1979-02-16 | 1979-02-16 | Apparatus for preventing decreasing of pressure in deaerator at the time when load is disconnected |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55109706A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59189205A (en) * | 1983-04-11 | 1984-10-26 | 株式会社日立製作所 | Method and device for controlling water supply flow rate |
| US4896500A (en) * | 1989-05-15 | 1990-01-30 | Westinghouse Electric Corp. | Method and apparatus for operating a combined cycle power plant having a defective deaerator |
-
1979
- 1979-02-16 JP JP1606179A patent/JPS55109706A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55109706A (en) | 1980-08-23 |
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