JPS6172805A - Steam turbine extraction device - Google Patents
Steam turbine extraction deviceInfo
- Publication number
- JPS6172805A JPS6172805A JP19518584A JP19518584A JPS6172805A JP S6172805 A JPS6172805 A JP S6172805A JP 19518584 A JP19518584 A JP 19518584A JP 19518584 A JP19518584 A JP 19518584A JP S6172805 A JPS6172805 A JP S6172805A
- Authority
- JP
- Japan
- Prior art keywords
- bleed
- pressure
- control valve
- steam turbine
- header
- 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
- 238000000605 extraction Methods 0.000 title claims description 16
- 230000007423 decrease Effects 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000009530 blood pressure measurement Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/345—Control or safety-means particular thereto
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Turbines (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】
（１）産業上の利用分野
本発明は蒸気タービンの内部効率の低下を防止し得る蒸
気タービンの抽気装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION (1) Field of Industrial Application The present invention relates to an air extraction device for a steam turbine that can prevent a decrease in internal efficiency of the steam turbine.
（２）従来技術
従来、蒸気タービンの抽気装置としては複数の抽気通路
に共通の−の抽気加減弁を使用した、所謂外部制御方式
が知られている。しかし、斯る抽気装置は−の抽気加減
弁のみでヘッダー圧力の調節を行なうものであるため、
蒸気タービンの負荷が高（なった場合には抽気加減弁絞
りによる圧力損失が増大し、蒸気タービンの内部効率が
低下するという欠点を生じている。また、蒸気タービン
高負荷時の圧力損失を小さくしようとすると、必然的に
タービンの運転範囲が狭くならざるを得ない。(2) Prior Art Conventionally, a so-called external control system is known as an air bleed device for a steam turbine, which uses a common bleed control valve for a plurality of bleed passages. However, since such an air bleed device adjusts the header pressure only with the bleed air adjustment valve,
When the load on the steam turbine is high, the pressure loss due to the bleed control valve throttle increases, resulting in a decrease in the internal efficiency of the steam turbine.In addition, it is possible to reduce the pressure loss during high loads of the steam turbine. If this is attempted, the operating range of the turbine will inevitably become narrower.
（３）発明が解決しようとする問題点
本発明は、蒸気タービンの負荷が変動しても抽気加減弁
絞りによる圧力損失を低減し得、これによりタービン効
率の低下を防止できると共に、抽気圧力の制御範囲を拡
大し得る蒸気タービンの抽気装置を提供することを目的
とする。(3) Problems to be Solved by the Invention The present invention can reduce the pressure loss caused by the extraction control valve throttling even when the load of the steam turbine fluctuates, thereby preventing a decrease in turbine efficiency and reducing the extraction pressure. An object of the present invention is to provide a steam turbine extraction device that can expand the control range.
（４）問題点を解決するための手段
本発明の蒸気タービンの抽気装置は次のような構成を採
る。すなわち、蒸気タービンの高圧側から低圧ｆｉｌＫ
かげて複数の抽気通路を並設し、これらの抽気通路の端
部をそれぞれヘッダーに連結する。各抽気通路にはそれ
ぞれ抽気加減弁を介装し、これらの抽気加減弁を次のよ
うに開閉制御する。すなわち、抽気点圧力が予め定めら
れたヘッダー圧力以上でかつ抽気加減弁絞りによる圧力
損失が最小となる−の抽気加減弁のみを開弁し、他の抽
気加減弁を閉弁する。(4) Means for solving the problems The steam turbine extraction device of the present invention has the following configuration. That is, from the high pressure side of the steam turbine to the low pressure filK
Thus, a plurality of air bleed passages are arranged in parallel, and the ends of these air bleed passages are respectively connected to the header. Each bleed passage is provided with a bleed control valve, and the opening and closing of these bleed control valves is controlled as follows. That is, only the bleed control valve whose bleed point pressure is equal to or higher than a predetermined header pressure and where the pressure loss due to the bleed control valve throttling is minimized is opened, and the other bleed control valves are closed.
また、各抽気通路の抽気加減弁の下流側にヘラグ一方向
への流れのみを許容する逆止弁を介装することかできる
。Furthermore, a check valve that only allows flow in one direction can be interposed downstream of the bleed air adjustment valve in each bleed passage.
（５）作用
蒸気タービンがある一定の負荷状態下で運転されている
ときには、複数の抽気加減弁のうち、り
その負荷状態に伴う抽気点圧力が予め定められたヘッダ
ー圧力以上で、かつ、抽気加減弁絞りによって生じる圧
力損失が最小となる一の抽気加減弁のみが開弁している
。したがって、この負荷状態下では開弁した抽気加減弁
の介装された抽気通路からのみへラダーへ蒸気が供給さ
れ、この抽気蒸気圧は開弁した抽気加減弁の弁開度を制
御することにより調節することができる。(5) Operation When the steam turbine is operated under a certain load condition, the bleed point pressure of one of the multiple bleed control valves according to the load condition is equal to or higher than the predetermined header pressure, and the bleed Only one bleed air control valve is open, which minimizes the pressure loss caused by the control valve throttling. Therefore, under this load condition, steam is supplied to the rudder only from the bleed passage provided with the open bleed control valve, and this bleed steam pressure is controlled by controlling the opening degree of the open bleed control valve. Can be adjusted.
次に、蒸気タービンの負荷状態が変動して低負荷状態に
なり、開弁じている抽気加減弁の抽気点圧力が予め定め
られたヘッダー圧力まで低下した時には、この抽気加減
弁が閉弁すると共にこの抽気加減弁よりも高圧側の抽気
加減弁が開弁する。Next, when the load state of the steam turbine fluctuates and becomes a low load state, and the bleed point pressure of the open bleed air control valve drops to the predetermined header pressure, this bleed air control valve closes and The bleed air control valve on the higher pressure side than this bleed air control valve opens.
このとき開弁する抽気加減弁は、このときの負荷状態に
伴う抽気点圧力が予め定められたヘッダー圧力以上で、
かつ、抽気加減弁絞りによって生じる圧力損失が最小と
なる抽気加減弁である。The bleed air adjustment valve that opens at this time is such that the bleed point pressure associated with the load condition at this time is equal to or higher than the predetermined header pressure.
In addition, this is a bleed air control valve that minimizes the pressure loss caused by the bleed air control valve restriction.
これに対し、上述の場合とは逆に、蒸気タービンこの負
荷状態が変動して高負荷状態になり、開弁している抽気
加減弁の抽気点圧力が予め定められたヘッダー圧力をは
るかに越えた場合には、より低圧側の抽気道路に介装さ
れた抽気加減弁が開弁じて、ヘッダー圧力を維持しつつ
抽気加減弁絞りによる圧力損失を低減する。On the other hand, contrary to the case described above, the load condition of the steam turbine fluctuates and becomes a high load condition, and the bleed point pressure of the open bleed control valve far exceeds the predetermined header pressure. In this case, the bleed control valve installed on the bleed road on the lower pressure side opens to maintain the header pressure while reducing the pressure loss due to the bleed control valve throttling.
そして、上述した抽気加減弁の切換えに際しては、開弁
していた抽気加減弁の弁開度を自動的に検出し、この弁
開度に基づいて弁切換の必要性の有無を判断すると共に
、切換えられる弁の弁開度を設定することが望ましい。When switching the bleed air control valve described above, the valve opening degree of the bleed air control valve that was open is automatically detected, and based on this valve opening degree, it is determined whether or not there is a need for valve switching. It is desirable to set the valve opening degree of the valve to be switched.
（６）実施例 以下、本発明の一実施例を図を参照して説明する。(6) Examples Hereinafter, one embodiment of the present invention will be described with reference to the drawings.
蒸気タービン１はタービン軸２を有し、蒸気タービン１
の高圧側端部に蒸気供給通路６によって供給される蒸気
によって回転する。蒸気タービン１に供給された蒸気は
蒸気タービン１の低圧側端部に連結された蒸気排出通路
４がら排出される。The steam turbine 1 has a turbine shaft 2, and the steam turbine 1
The high-pressure side end of the rotor is rotated by steam supplied from the steam supply passage 6. Steam supplied to the steam turbine 1 is discharged from a steam exhaust passage 4 connected to the low-pressure end of the steam turbine 1.
図中５は通路乙に介装された主蒸気止め弁を示し、６は
同じ（通路６に介装された蒸気加減弁を示す。In the figure, 5 indicates a main steam stop valve installed in the passage B, and 6 indicates the same (steam control valve installed in the passage 6).
本実施例においては、二本の抽気通路７．８が蒸気ター
ビン１の高圧側から低圧側にかけて並設され、高圧側の
抽気通路７と低圧側の抽気通路８とはその端部をそれぞ
れヘッダー９に連結されている。抽気通路７．８にはそ
れぞれ抽気加減弁１０．１１が介装されると共に、これ
らの抽気加減弁１０．１１の下流側には逆止弁１２．１
３が介装されている。逆止弁１２．１５は蒸気のヘッダ
ー９方向への流れのみを許容する。そして、図中、１４
は高圧側の抽気圧測定点、１５は低圧側の抽気圧測定点
を示し、また、Ｐ、は測定点１４における抽気圧、Ｐ２
は測定点１５における抽気圧、Ｐ３はヘッダー９内の圧
力である。In this embodiment, two bleed passages 7.8 are arranged in parallel from the high pressure side to the low pressure side of the steam turbine 1, and the high pressure side bleed passage 7 and the low pressure side bleed passage 8 have their ends connected to the header. It is connected to 9. A bleed air control valve 10.11 is installed in each of the bleed air passages 7.8, and a check valve 12.1 is provided downstream of these bleed air control valves 10.11.
3 is interposed. The check valves 12.15 only allow steam to flow in the direction of the header 9. And in the figure, 14
indicates the bleed pressure measurement point on the high pressure side, 15 indicates the bleed pressure measurement point on the low pressure side, P is the bleed pressure at the measurement point 14, and P2
is the extraction pressure at the measurement point 15, and P3 is the pressure inside the header 9.
以下、作用を説明する。The action will be explained below.
今、蒸気タービン１が比較的低負荷状態下で回転してお
り、測定点１４の抽気圧は予め定められたヘッダー圧力
Ｐ３ｖＣ等しいか又はそれ以上であり、測定点１５の抽
気圧はヘッダー圧力Ｐ３よりも低いとする。この状態で
は抽気加減弁１１が閉弁して抽気加減弁１０が開弁し、
ヘッダー９内に予め定められたヘッダー圧力Ｐ３の蒸気
を抽出させる。このときの抽出蒸気圧は抽気加減弁１ｏ
の弁開度によって調節可能である。この状態を第２図に
基づいて説明すると次のようになる。すなわち、抽気圧
Ｐ、が予め定められたヘッダー圧力Ｐ３に等しい時のタ
ービン負荷をＸとすると、このタービン負荷Ｘでは抽気
圧Ｐ２はヘッダー圧力Ｐ３よりも小さいから、抽気加減
弁１０のみを開弁じて所定圧力の蒸気ヘッダー９内に抽
出するのである。Now, the steam turbine 1 is rotating under a relatively low load condition, the extraction pressure at the measurement point 14 is equal to or higher than the predetermined header pressure P3vC, and the extraction pressure at the measurement point 15 is the header pressure P3vC. Suppose that it is lower than . In this state, the bleed air adjustment valve 11 is closed and the bleed air adjustment valve 10 is opened,
Steam at a predetermined header pressure P3 is extracted into the header 9. The extraction steam pressure at this time is the extraction control valve 1o.
It can be adjusted by the valve opening degree. This state will be explained as follows based on FIG. That is, if the turbine load when the bleed pressure P is equal to the predetermined header pressure P3 is X, then at this turbine load X, the bleed pressure P2 is smaller than the header pressure P3, so only the bleed control valve 10 is opened. The steam is extracted into the steam header 9 at a predetermined pressure.
次に、タービン負荷がＸからＹまで上昇したとする（第
２図参照）。斯るタービン負荷の上昇にも拘らず、抽気
通路７から蒸気を抽出しておくと、抽気加減弁１０の絞
りによる圧力損失を生じる。Next, assume that the turbine load increases from X to Y (see Fig. 2). If steam is extracted from the bleed passage 7 despite such an increase in turbine load, a pressure loss will occur due to the restriction of the bleed control valve 10.
この圧力損失は、第２図中、三角形ａｂｃで表わされる
。予め定められたヘッダー圧力はＰ３であるからである
。This pressure loss is represented by triangle abc in FIG. This is because the predetermined header pressure is P3.
タービン負荷がＹのときには抽気圧Ｐ２はヘソグー圧力
Ｐ３以上の大きさであるから、抽気加減弁１０の開度を
検出し、この加減弁１０を閉弁すると同時に抽気加減弁
１１を開弁させる。これにより、ヘッダー９への抽気は
抽気通路８ｖＣよって行なわれるが、加減弁１１がその
絞りにより発生する圧力損失は、第２図中、三角形ｄｅ
ｂで表わされるから、抽気通路７によって抽気を行なう
場合よりも圧力損失は大巾に減小する。When the turbine load is Y, the bleed pressure P2 is greater than the pressure P3, so the opening degree of the bleed control valve 10 is detected, and the bleed control valve 10 is closed and the bleed control valve 11 is opened at the same time. As a result, air is bleed to the header 9 through the bleed passage 8vC, but the pressure loss generated by the throttle valve 11 is caused by the triangle de in FIG.
b, the pressure loss is greatly reduced compared to the case where air is bled through the air bleed passage 7.
また、加減弁１１が開弁じた状態において、タービン負
荷がＹからＸへ減少した場合には、ヘッダー９内の圧力
が予め定められたヘッダー圧力Ｐ３まで減少した時に加
減弁１１を閉弁して加減弁１０を開弁する。これにより
、ヘッダー９への抽気は抽気通路７によって行なわれ、
加減弁１０の絞りによる損失は、第２図沖、三角形ａｆ
ｄで表わされる。In addition, when the turbine load decreases from Y to X while the regulator valve 11 is open, the regulator valve 11 is closed when the pressure in the header 9 decreases to a predetermined header pressure P3. The control valve 10 is opened. As a result, air is bleed to the header 9 through the bleed passage 7,
The loss due to the throttling of the regulating valve 10 is shown in Figure 2, triangle af.
It is represented by d.
このように、圧力制御運転範囲を同一にすると、二つの
加減弁１’０．１１を適宜切換えて使用することによる
圧力損失は三角形ａｆｄと三角形ｄｅｂとで表わされ、
この圧力損失は一つの加減弁１０のみを使用した場合の
圧力損失（三角形ａｂＣ）よりはるかに小さい。In this way, if the pressure control operating range is the same, the pressure loss caused by appropriately switching and using the two regulating valves 1'0.11 is represented by the triangle afd and the triangle deb.
This pressure loss is much smaller than the pressure loss (triangle abC) when only one regulating valve 10 is used.
（力効果
以上説明したように、本発明の蒸気タービンの抽気装置
によれば、抽気加減弁を複数個設け、これらの加減弁を
適宜切換えて抽気を行なうようにしたので、加減弁絞り
による圧力損失が大巾に減少し、蒸気タービンの内部効
率が上昇するという効果を得る。(As explained above, according to the steam turbine extraction system of the present invention, a plurality of extraction control valves are provided and the control valves are switched appropriately to perform air extraction, so that the pressure caused by the control valve restriction is The effect is that losses are greatly reduced and the internal efficiency of the steam turbine is increased.
また、複数の抽気加減弁を設けだので、抽気圧力制御範
囲が拡大するという効果をも得る。Furthermore, since a plurality of bleed air control valves are provided, the bleed air pressure control range is expanded.
第１図は本発明装置の一実施例の概略構成図。
第２図はタービン負荷と抽気圧力特性を表わす図。
１・・・・・・蒸気タービン ２・・印・タービン軸
７．８・・・・・・抽気通路 ９・・・・・・ヘッ
ダー１０．１１・・・・・・抽気加減弁
１２．１６・・・・・・逆止弁FIG. 1 is a schematic diagram of an embodiment of the apparatus of the present invention. FIG. 2 is a diagram showing turbine load and extraction pressure characteristics. 1...Steam turbine 2...Turbine shaft 7.8...Bleed passage 9...Header 10.11...Bleed air control valve 12.16 ······non-return valve
Claims (1)
気通路を並設し、該抽気通路の端部をそれぞれヘッダー
に連結し、前記各抽気通路にそれぞれ抽気加減弁を介装
すると共に、抽気点圧力が予め定められたヘッダー圧力
以上でかつ前記抽気加減弁絞りによる圧力損失が最小と
なる一の前記抽気加減弁のみを開弁し他の前記抽気加減
弁を閉弁することを特徴とする蒸気タービンの抽気装置
。 ２）特許請求の範囲第１項の記載において、前記各抽気
通路の前記抽気加減弁の下流側に前記ヘッダー方向への
流れのみを許容する逆止弁をそれぞれ介装してなる蒸気
タービンの抽気装置。[Scope of Claims] 1) A plurality of bleed passages are arranged in parallel from the high pressure side to the low pressure side of the steam turbine, the ends of the bleed passages are connected to a header, and each bleed passage is provided with a bleed control valve. At the same time, only one of the bleed control valves whose bleed point pressure is equal to or higher than a predetermined header pressure and the pressure loss due to the bleed control valve restriction is minimized is opened, and the other bleed control valves are closed. A steam turbine extraction device characterized by: 2) In the statement of claim 1, the steam turbine bleed air is provided with a check valve that allows only flow toward the header on the downstream side of the bleed air control valve in each of the bleed passages. Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19518584A JPS6172805A (en) | 1984-09-18 | 1984-09-18 | Steam turbine extraction device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19518584A JPS6172805A (en) | 1984-09-18 | 1984-09-18 | Steam turbine extraction device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6172805A true JPS6172805A (en) | 1986-04-14 |
Family
ID=16336863
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19518584A Pending JPS6172805A (en) | 1984-09-18 | 1984-09-18 | Steam turbine extraction device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6172805A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2312130A1 (en) * | 2009-10-13 | 2011-04-20 | Siemens Aktiengesellschaft | Adjustment of the preheat end temperature of a power plant secondary circuit with selective activation of different bleed connections of a steam turbine |
-
1984
- 1984-09-18 JP JP19518584A patent/JPS6172805A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2312130A1 (en) * | 2009-10-13 | 2011-04-20 | Siemens Aktiengesellschaft | Adjustment of the preheat end temperature of a power plant secondary circuit with selective activation of different bleed connections of a steam turbine |
| WO2011045213A1 (en) * | 2009-10-13 | 2011-04-21 | Siemens Aktiengesellschaft | Adapting the final preheating temperature of a secondary circuit of a power plant by means of selectively activating different extraction connections of a steam turbine |
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