JPS6237603A - Steam controller for boiler feed-pump driving turbine - Google Patents
Steam controller for boiler feed-pump driving turbineInfo
- Publication number
- JPS6237603A JPS6237603A JP17317985A JP17317985A JPS6237603A JP S6237603 A JPS6237603 A JP S6237603A JP 17317985 A JP17317985 A JP 17317985A JP 17317985 A JP17317985 A JP 17317985A JP S6237603 A JPS6237603 A JP S6237603A
- Authority
- JP
- Japan
- Prior art keywords
- steam
- pressure
- turbine
- boiler feed
- auxiliary
- 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.)
- Pending
Links
Landscapes
- Control Of Turbines (AREA)
- 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】
〔発明の技術分野〕
本発明は、特に、ボイラ給水ポンプ駆動タービン(以下
BFP −Tと略称す)を駆動するための蒸気圧力の制
御方法を改良したボイラ給水ポンプ駆動タービンの蒸気
制御装置に関する。Detailed Description of the Invention [Technical Field of the Invention] The present invention particularly relates to a boiler feed water pump drive that improves a steam pressure control method for driving a boiler feed water pump drive turbine (hereinafter abbreviated as BFP-T). The present invention relates to a steam control device for a turbine.
近年の汽力発電所では、ニネルギー事情の多様化、化石
燃料の有効利用、省エネルギー等の様々な見地から、効
率的な運用が叫ばれており、その対応策としてPCB運
転機能及びRFP−Tによるプラント起動機能を具備す
るプラントが増加して来ている。In recent years, steam power plants have been required to operate efficiently from various perspectives such as diversification of energy situations, effective use of fossil fuels, and energy conservation. An increasing number of plants are equipped with startup functions.
FCB運転機能とは、今更いうまでもなく送電系統側で
の不測の事故等により運転中の発電所からの送電が不可
能となった場合に、当該運転中の発電所(ユニット)を
停止することなく、速かに所内負荷相当の極低負荷運転
に移行して運転を継続・待機し、送電系統側が復旧した
後に速かに要求負荷を送電するための、急速負荷絞り込
み機能を言う。Needless to say, the FCB operation function shuts down the power plant (unit) in operation if it becomes impossible to transmit power from the power plant due to an unexpected accident on the power transmission system side. This refers to a rapid load narrowing function that quickly shifts to extremely low load operation equivalent to the in-plant load, continues operation or stands by, and quickly transmits the requested load after the power transmission system is restored.
火力発電プラントは一旦停止してしまうと、次回の起動
に際して不可避的に膨大な起動損失を伴なうため、上記
FC8機能は省エネルギーの観点からも、是非とも具備
すべき機能である。又、BFP・Tは通常運転中は主タ
ービン抽気蒸気により駆動する系統構成が一般的である
。そして、ユニット起動前及び起動中の低負荷まではタ
ービン抽気がとれないため、その間のボイラ給水は、電
動機駆動給水ポンプC以下M −BFPという)により
送給されるのが一般的である。Once a thermal power plant is stopped, it will inevitably be accompanied by a huge startup loss when it is restarted the next time, so the FC8 function described above is a function that must be provided from the viewpoint of energy conservation. In addition, the BFP/T generally has a system configuration in which it is driven by main turbine extracted steam during normal operation. Since turbine bleed water cannot be removed until the load is low before and during startup of the unit, the boiler water supply during that time is generally supplied by an electric motor-driven water supply pump C (hereinafter referred to as M-BFP).
しかしながら、M −RFPによるユニット起動は。However, unit activation by M-RFP.
系統構成が簡素であるけれども、に−RFP故障時のバ
ックアップ用として、又より効率的な運用を目積して、
タービン駆動給水ポンプ(以下T−BFPという)によ
るユニット起動機能を備えるプラントが増えて来ている
。これはBFP −T駆動蒸気として、主タービン抽気
が使用出来ないときに補助的に蒸気を供給する補助蒸気
系統を設置するもので、近年の電力需要の多様化に伴な
う発電所の起動・停止回数の飛躍的な増加を考えた場合
、起動時の信頼性確保及び省エネルギーという意味から
重要な機能・系統である。Although the system configuration is simple, it can be used as a backup in the event of a RFP failure, and with the aim of more efficient operation.
An increasing number of plants are equipped with a unit starting function using a turbine-driven water pump (hereinafter referred to as T-BFP). This system installs an auxiliary steam system that supplies steam as the BFP-T driving steam when main turbine extraction air cannot be used. Considering the dramatic increase in the number of stoppages, this is an important function and system from the standpoint of ensuring reliability during startup and saving energy.
第2図に従来のボイラ給水ポンプ駆動タービン(BFP
−T)の駆動蒸気系統を示す、タービン駆動給水ポン
プ(T−BFP) 1を駆動するボイラ給水ポンプ駆動
タービン(BFP−T) 2は、その駆動蒸気系統とし
て、通常運転中に使用するタービンTおよび発電機Gの
主タービン抽気系IJisの他に、起動時及び極低負荷
又はFe2時等の主タービン抽気系統3が使用出来ない
ときに使用する補助蒸気系統4を有し、更に通常運転か
らPCB運転に移行する際、過渡的に使用する高圧主蒸
気系統5を有するものもある。Figure 2 shows a conventional boiler feed water pump drive turbine (BFP).
-T) shows the driving steam system of the turbine-driven feedwater pump (T-BFP) 1, which drives the boiler feedwater pump-driving turbine (BFP-T) 2, which is the driving steam system for the turbine T used during normal operation. In addition to the main turbine extraction system IJis of the generator G, there is an auxiliary steam system 4 that is used when the main turbine extraction system 3 cannot be used, such as during startup, extremely low load or Fe2, and Some have a high-pressure main steam system 5 that is used temporarily when transitioning to PCB operation.
そして、主タービン抽気3又は補助蒸気4を使用する際
に、BFP−Tを制御する低圧蒸気止め弁(以下LP−
MSV)、低圧蒸気加減弁(以下LP −CVという)
と、高圧主蒸気を使用する際、RFP −Tを制御する
高圧蒸気止め弁(以下11P−MSV) 、高圧蒸気加
減弁(以下HP −CV)を具備している。When using the main turbine extraction air 3 or the auxiliary steam 4, a low pressure steam stop valve (hereinafter LP-
MSV), low pressure steam control valve (hereinafter referred to as LP-CV)
When using high-pressure main steam, it is equipped with a high-pressure steam stop valve (hereinafter referred to as 11P-MSV) and a high-pressure steam control valve (hereinafter referred to as HP-CV) that control the RFP-T.
更に補助蒸気系統は元圧が一般に主タービン抽気圧力よ
りも高いために、補助蒸気圧力制御弁6が設けられる。Furthermore, since the source pressure of the auxiliary steam system is generally higher than the main turbine extraction pressure, an auxiliary steam pressure control valve 6 is provided.
補助蒸気圧力制御弁6は、圧カ検出器7.圧力発信器8
.圧力調節計9等により低圧蒸気止め弁LP−MSVの
一次側圧方が一定になるよう制御している
しかしながら、従来のBFP −T駆動蒸気系統には次
のような問題があった。ユニット起動時にBFP・Tを
駆動するための必要蒸気エネルギーとFe8時のそれと
では大きく差があるため、補助蒸気圧力制御弁6の選定
が難しく、その結果、ユニット起動時又はFe2時のF
CP−T制御が難しく、ややもすると前記運転が失敗し
たり、別の場合は非合理的な容量の弁の選定を余儀され
るということである。The auxiliary steam pressure control valve 6 is connected to a pressure detector 7. Pressure transmitter 8
.. However, the conventional BFP-T drive steam system has the following problems. Since there is a large difference between the required steam energy to drive BFP/T at unit startup and that at Fe8, it is difficult to select the auxiliary steam pressure control valve 6.
CP-T control is difficult, and in some cases, the operation may fail, and in other cases, it is necessary to select a valve with an irrational capacity.
第3図に近年省エネルギー、高効率運用を目的として、
はとんどの新設プラントで採用されている変圧プラント
のT −BFPシステム抵抗曲線の一例を示す、第3図
において点9八′は定格負荷におけるT −RFP運転
点2点1B′は定格負荷運転時からPCB運転に移行す
る際の過渡的な運転点。Figure 3 shows that in recent years, with the aim of energy saving and highly efficient operation,
Figure 3 shows an example of the T-BFP system resistance curve of a transformer plant that is adopted in most new plants. In Figure 3, point 98' is the T-RFP operating point 2 at rated load, and point 1B' is rated load operation. A transitional operating point when transitioning from time to PCB operation.
点゛C′はユニット起動過程に通過する運転点を示す、
又、B′はPCB整定検定後転点を示す、そして、前述
のように点#A′では主タービン抽気により、点3B′
では高圧主蒸気系統及び補助蒸気系統により、点゛B及
びC1では補助蒸気系統によりRFP−Tは駆動される
。Point ゛C' indicates the operating point passed during the unit startup process.
Also, B' indicates the turning point after PCB setting verification, and as mentioned above, at point #A', due to main turbine bleed air, point 3B'
At points B and C1, the RFP-T is driven by the high-pressure main steam system and the auxiliary steam system.
第4図に第2図の点A−Cの運転点におけるT−BFP
の軸動力を示す0点a−cは第3図の点A〜Cに対応し
ている。第4図より明らかなように、点A−Cの運転で
は、T −BFP所要動力に点a −Qと大きな隔たり
があるのが判る。特に補助蒸気系統4すなわち、補助蒸
気制御弁6を使用して運転するB、B ’、Cの各点で
それぞれす、b’、cと大きく異なる。Figure 4 shows the T-BFP at the operating point of points A-C in Figure 2.
Points ac indicating the shaft power correspond to points A to C in FIG. As is clear from FIG. 4, there is a large difference in the T-BFP required power during operation between points A and C and between points a and Q. In particular, the auxiliary steam system 4, that is, the auxiliary steam control valve 6 is used to operate B, B', and C, which differ greatly from A, b', and C, respectively.
軸動力が異るということは、それを駆動するための蒸気
エネルギー、蒸気量が異るということである。当然のこ
とながら、軸動力が多いと蒸気量も多く必要とするため
、補助蒸気制御弁6は多い場合を想定して容量を選定す
る必要がある。 他方、 RFP−TはLP−MSV、
LP−CV及びノズル面積が一定で製作されているた
め、LP−MSV、 LP−CVの一次側の蒸気圧力に
より一義的に最大吸込可能蒸気量が或る範囲に決定され
、−水圧力が高ければ多量の蒸気を吸込むことができ、
低くなれば、少なくなる。Different shaft power means different steam energy and amount of steam to drive it. Naturally, if the shaft power is large, a large amount of steam is also required, so the capacity of the auxiliary steam control valve 6 needs to be selected assuming a large amount. On the other hand, RFP-T is LP-MSV,
Since the LP-CV and the nozzle area are manufactured with a constant area, the maximum amount of steam that can be sucked is uniquely determined within a certain range by the steam pressure on the primary side of the LP-MSV and LP-CV. You can inhale a large amount of steam,
The lower it gets, the less it gets.
従来、補助蒸気圧力制御弁6の二次側の制御圧力は効率
的な運転を目的として主タービン抽気側への切替をなる
べく低い負荷でスムーズに行なうため、主タービン抽気
がとれはじめる下限負荷付近に設定されて、制御されて
いた。Conventionally, the control pressure on the secondary side of the auxiliary steam pressure control valve 6 has been set at around the lower limit load where the main turbine bleed air starts to be removed, in order to smoothly switch to the main turbine bleed air side at as low a load as possible for the purpose of efficient operation. It was set and controlled.
しかしながら、従来の方法では次のような不具合がある
。すでに述べたように補助蒸気は、運転点に応じて、巾
を持った量が要求される。すなわち第3図中の運転点B
、B’のFe2時は多量であり、点Cの起動時は少なく
て良い、又、補助蒸気圧力制御弁6の設定圧は高ければ
RFP −Tがたくさん蒸気を吸込めるし、低ければ少
なくなる。よって制御弁の選定及び制御が難しくなり、
場合によっては、駆動蒸気量不足により、ボイラ給水を
所定の量まで送給出来ず、PCB運転の失敗になりかね
ない。However, the conventional method has the following problems. As already mentioned, the amount of auxiliary steam required varies depending on the operating point. In other words, operating point B in Figure 3
, B' is a large amount at the time of Fe2, and at the time of start-up at point C, only a small amount is required.Also, if the setting pressure of the auxiliary steam pressure control valve 6 is high, RFP-T can suck in a lot of steam, and if it is low, it will be less. . This makes selection and control of control valves difficult.
In some cases, due to insufficient amount of driving steam, boiler feed water cannot be fed to a predetermined amount, which may result in failure of PCB operation.
PCB運転は前述の通り重要な機能であり、必ず成功さ
せるためにも早急に解決すべき問題である。PCB operation is an important function as mentioned above, and it is a problem that must be solved as soon as possible to ensure success.
本発明の目的は、Fe2時においても確実にボイラ給水
ポンプ駆動タービン(BFP −T)へ駆動蒸気を供給
し、かつタービン駆動給水ポンプ(T −BFP)によ
るユニット起動時にも充分対応出来るボイラ給水ポンプ
駆動タービンの蒸気制御装置を提供することにある。The object of the present invention is to provide a boiler feed water pump that can reliably supply driving steam to the boiler feed water pump drive turbine (BFP-T) even in Fe2 conditions, and that can sufficiently cope with unit startup by the turbine drive water pump (T -BFP). An object of the present invention is to provide a steam control device for a driving turbine.
本発明によるボイラ給水ポンプ駆動タービンの蒸気制御
装置は、主タービン抽気系統および補助蒸気系統から選
択的に駆動蒸気の供給をうけるボイラ給水ポンプ駆動タ
ービンの駆動蒸気系において、補助蒸気系統に設けた補
助蒸気圧力制御弁の制御系に或る条件に応じて設定圧力
を切替える設定圧力切替器を設けたことを特徴とするも
のである。The steam control device for a boiler feedwater pump-driven turbine according to the present invention is a boiler feedwater pump-driven turbine drive steam system that receives drive steam selectively from the main turbine extraction system and the auxiliary steam system. The steam pressure control valve is characterized in that a control system for the steam pressure control valve is provided with a set pressure switch that switches the set pressure according to a certain condition.
以下本発明を第1図に示す実施例にもとすいて説明する
0本発明によるボイラ給水ポンプ駆動タービン(RFP
−T)の蒸気制御装置においても、ボイラ給水ポンプ
(RFP) 1を直結するボイラ給水ポンプ駆動タービ
ン(BFP −T) 2は、通常運転中においては蒸気
タービンTおよび発電機Gのシステムからの主タービン
抽気系統3から逆止弁Vい 低圧蒸気止め弁LP −M
SVおよび低圧蒸気加減弁LP−eVを通して供給され
る駆動蒸気によって駆動される。The present invention will be explained below with reference to the embodiment shown in FIG.
-T) steam control system, the boiler feed water pump drive turbine (BFP-T) 2, which is directly connected to the boiler feed water pump (RFP) 1, is connected to the main power supply from the steam turbine T and generator G system during normal operation. Check valve V from turbine extraction system 3 Low pressure steam stop valve LP-M
It is driven by driving steam supplied through the SV and the low pressure steam control valve LP-eV.
またタービン駆動給水ポンプ(T −RFP)によるユ
ニット起動時は、補助蒸気系統4から補助蒸気圧力制御
弁6および逆止弁v2を通して供給される補助蒸気によ
って駆動される。さらに通常運転からPCB運転に移行
する際に過渡的に使用する高圧主蒸気系統5から高圧蒸
気止め弁HP−MSVおよび高圧蒸気加減弁IP −C
Vを通して供給される高圧蒸気によっても駆動されるよ
うに構成されている。Further, when the unit is started by the turbine-driven water pump (T-RFP), it is driven by auxiliary steam supplied from the auxiliary steam system 4 through the auxiliary steam pressure control valve 6 and the check valve v2. Furthermore, the high pressure main steam system 5, which is used transiently when transitioning from normal operation to PCB operation, has a high pressure steam stop valve HP-MSV and a high pressure steam control valve IP-C.
It is also configured to be driven by high pressure steam supplied through V.
しかして本発明においては、補助蒸気系統4にもうけた
補助蒸気圧力制御弁6を圧力検出器7、圧力発信器8お
よび圧力調節計9により、低圧蒸気止め弁LP−MSV
の一次側圧力が一定になるよう制御するよう構成してい
るが、さらに設定圧力切替器21を設けてその設定圧力
に補助蒸気圧力制御弁6の二次側圧力を制御するよう構
成している。この設定圧力切替器21は設定値1および
設定値2を有し、その両者の関係を設定値1〈設定値2
とし、この両者設定値1.2の切替えは、設定圧力切替
信号によって任意に切替えられる。Therefore, in the present invention, the auxiliary steam pressure control valve 6 provided in the auxiliary steam system 4 is connected to the low pressure steam stop valve LP-MSV by the pressure detector 7, the pressure transmitter 8, and the pressure regulator 9.
Although it is configured to control the primary side pressure to be constant, it is further provided with a set pressure switch 21 and configured to control the secondary side pressure of the auxiliary steam pressure control valve 6 to the set pressure. . This set pressure switching device 21 has a set value 1 and a set value 2, and the relationship between the two is set as set value 1 < set value 2.
The switching between these set values of 1.2 and 1.2 can be arbitrarily performed using a set pressure switching signal.
したがって、いまT −BFPによるユニット起動時な
どで蒸気量が少なくて良い場合は、設定値1に切替えて
制御し、主タービン抽気との切替えを円滑に低い負荷帯
で行なって高効率運転を行なう。Therefore, if a small amount of steam is required, such as when the unit is started by T-BFP, control is performed by switching to the setting value 1 to smoothly switch to the main turbine bleed air in a low load range and perform high-efficiency operation. .
またPCB運転時などの蒸気量を多量に必要とする場合
には、設定値2に切替えて制御する。この結果、t3F
P −Tの低圧蒸気加減弁LP −CVの一次圧力が上
昇するため、RFP−Tは多量の蒸気利用を吸込むこと
ができる。Further, when a large amount of steam is required, such as during PCB operation, the setting value is switched to 2 for control. As a result, t3F
Since the primary pressure of the low-pressure steam control valve LP-CV of the P-T increases, the RFP-T can draw in a large amount of steam utilization.
このように本発明においては補助蒸気圧力制御弁の制御
系に設定圧力切替器21を追加したことによりT −R
FPによるユニット起動、PCB運転のいずれにも確実
に対応することができる。In this way, in the present invention, by adding the set pressure switch 21 to the control system of the auxiliary steam pressure control valve, the T-R
It can reliably support both unit startup by FP and PCB operation.
なお、第1図に示す実施例では、設定値1および設定値
2を有する設定圧力切替器21を設けて、圧力調節計9
に対応する設定圧力値を切替えるようにしているが、本
発明はこれに限定されるものでなく、例えば別々の調節
計を設けてこれを切替えて使用するようにしても同等の
作用効果を得ることができる。In the embodiment shown in FIG. 1, a set pressure switch 21 having a set value 1 and a set value 2 is provided,
Although the set pressure value corresponding to the pressure is switched, the present invention is not limited to this. For example, the same effect can be obtained even if separate controllers are provided and used by switching between them. be able to.
以上のように本発明によれば、補助蒸気系統に設けた補
助蒸気圧力制御弁の制御系に或る条件に応じて設定圧力
を切替える設定圧力切替器を設けたことにより、PCB
運転時にも充分に必要な蒸気量をボイラ給水ポンプ駆動
タービンに供給し、またタービン駆動給水ポンプ(T
−RFP)によるユニット起動時にも効率運転を可能と
することができる。As described above, according to the present invention, the control system of the auxiliary steam pressure control valve provided in the auxiliary steam system is provided with a set pressure switch that switches the set pressure according to a certain condition.
During operation, a sufficient amount of steam is supplied to the boiler feed water pump driving turbine, and the turbine driven feed water pump (T
Efficient operation can be made possible even when the unit is started up by -RFP).
第1図は本発明によるボイラ給水ポンプ駆動タービンの
蒸気制御装置の一実施例を示す蒸気系統図、第2図は従
来のボイラ給水ポンプ駆動タービンの蒸気制御装置を示
す蒸気系統図、第3図は変圧プラントのボイラ給水ポン
プのシステム抵抗曲線図、第4図はボイラ給水ポンプの
所要動力曲線図である。
1・・・ボイラ給水ポンプ(RFP)
2・・・ボイラ給水ポンプ駆動タービン(RFP−T)
3・・・主タービン抽気系統 4・・・補助蒸気系統5
・・・高圧蒸気系統 6・・・補助蒸気圧カ制御井7・
・・圧力検出Ia 8・・・圧力発信器9・・・圧
力調節計 21・・・設定圧力切替器22・・・設
定圧力切替信号
代理人 弁理士 猪股祥晃(ほか1名)−銘水りん童
第 3 図
第4図FIG. 1 is a steam system diagram showing an embodiment of the steam control device for a boiler feedwater pump-driven turbine according to the present invention, FIG. 2 is a steam system diagram showing a conventional steam control device for a boiler feedwater pump-driven turbine, and FIG. 4 is a system resistance curve diagram of a boiler feed pump of a variable pressure plant, and FIG. 4 is a required power curve diagram of a boiler feed pump. 1... Boiler feed pump (RFP) 2... Boiler feed water pump drive turbine (RFP-T)
3... Main turbine extraction system 4... Auxiliary steam system 5
...High pressure steam system 6...Auxiliary steam pressure control well 7.
...Pressure detection Ia 8...Pressure transmitter 9...Pressure regulator 21...Setting pressure switch 22...Setting pressure switching signal agent Patent attorney Yoshiaki Inomata (and one other person) - Meisui Rindo Figure 3 Figure 4
Claims (1)
的に駆動蒸気の供給をうけるボイラ給水ポンプ駆動ター
ビンの駆動蒸気系において、補助蒸気系統に設けた補助
蒸気圧力制御弁の制御系に或る条件に応じて設定圧力を
切替える設定圧力切替器を設けたことを特徴とするボイ
ラ給水ポンプ駆動タービンの蒸気制御装置。(1) In the drive steam system of the boiler feedwater pump drive turbine that receives drive steam selectively from the main turbine extraction system and the auxiliary steam system, certain conditions exist in the control system of the auxiliary steam pressure control valve installed in the auxiliary steam system. 1. A steam control device for a boiler feedwater pump-driven turbine, characterized in that a set pressure switch is provided to switch the set pressure according to the set pressure.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17317985A JPS6237603A (en) | 1985-08-08 | 1985-08-08 | Steam controller for boiler feed-pump driving turbine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17317985A JPS6237603A (en) | 1985-08-08 | 1985-08-08 | Steam controller for boiler feed-pump driving turbine |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6237603A true JPS6237603A (en) | 1987-02-18 |
Family
ID=15955550
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17317985A Pending JPS6237603A (en) | 1985-08-08 | 1985-08-08 | Steam controller for boiler feed-pump driving turbine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6237603A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5533337A (en) * | 1993-07-23 | 1996-07-09 | Hitachi, Ltd. | Feed water supply system of power plant |
-
1985
- 1985-08-08 JP JP17317985A patent/JPS6237603A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5533337A (en) * | 1993-07-23 | 1996-07-09 | Hitachi, Ltd. | Feed water supply system of power plant |
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