JP2000257405A - Operation method for steam turbine plant - Google Patents
Operation method for steam turbine plantInfo
- Publication number
- JP2000257405A JP2000257405A JP11061852A JP6185299A JP2000257405A JP 2000257405 A JP2000257405 A JP 2000257405A JP 11061852 A JP11061852 A JP 11061852A JP 6185299 A JP6185299 A JP 6185299A JP 2000257405 A JP2000257405 A JP 2000257405A
- Authority
- JP
- Japan
- Prior art keywords
- steam
- turbine
- bleed
- pressure
- extracted
- 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.)
- Granted
Links
Landscapes
- Control Of Turbines (AREA)
Abstract
Description
【発明の属する技術分野】本発明は蒸気タービンプラン
トの運転方法に係わり、特に複数の段落を有する蒸気タ
ービンの中間段での主蒸気の一部を抽出して、給水加熱
器や脱気器等のタービン補器類に供給するように形成さ
れている蒸気タービンプラントの運転方法に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for operating a steam turbine plant, and more particularly to a method for extracting a part of main steam at an intermediate stage of a steam turbine having a plurality of paragraphs to feed water heaters and deaerators. The present invention relates to a method for operating a steam turbine plant configured to supply turbine accessories.
【従来の技術】前述した抽気蒸気タービンプラントの一
例として、発電用蒸気タービンに採用されている一般的
な系統が図２に示されている。図において、１が抽気復
水タービンであり、２はタービン１からの抽気蒸気を供
給する蒸気需要先（例えば、給水加熱器や脱気器等のタ
ービン補器類、または自家用発電プラントとして蒸気を
利用して工場での生産物を加工するプロセス等）、３は
抽気復水タービン１の中間段から引き出して蒸気需要先
２との間に配管した抽気蒸気供給管であり、この抽気蒸
気供給管３には、抽気蒸気止め弁５や抽気蒸気加減弁６
が接続されている。なお、６ａは流量計、８はタービン
１の入口側の主蒸気供給管９に接続した蒸気加減弁、２
０はタービン１が駆動する発電機である。前述した流量
計６ａは、抽気蒸気供給管路３を流れる抽気蒸気の流量
を検出し、抽気蒸気流量が抽気蒸気要求流量に一致する
よう抽気蒸気加減弁６に開度信号を送るために設けられ
たものであり、フローノズルやオリフィスなどを用いた
差圧流量計が一般に採用されている。なお、実際の系統
では図２と同様に制御部２１が設けてあり、６ａからの
流量信号は制御部２１に入り、抽気蒸気要求信号との偏
差より制御部２１が抽気蒸気加減弁６に開度信号を送る
ことになるが、ここでは省略している。１０，１１はそ
れぞれタービン初段後圧力計、抽気蒸気圧力計であり、
それぞれタービン１への蒸気流入部での蒸気圧力と抽気
蒸気圧力を監視するために設けられるものである。な
お、上記の例では抽気系統が流量制御である場合を例に
示したが、抽気系統を圧力制御とする場合もある。その
場合、流量計６ａの代わりに抽気蒸気加減弁出口圧力計
を設置し、この圧力計の検出信号で抽気蒸気加減弁６を
制御することになる。上記のような系統において、図５
に示されているように何らかの原因でタービン１から抽
気蒸気供給管３を通って流出する抽気蒸気流量が計画値
以上に増え続けた場合、タービン１の蒸気流入部と抽気
蒸気供給管３が接続しているタービン段落の間での圧力
差が大きくなる。この段落間差圧によってタービン翼は
タービン下流側に引っ張られることになり、抽気蒸気の
必要蒸気流量が全蒸気流量に対して大きいプラントの場
合には発生する差圧も大きくなるので、差圧による応力
がタービン翼の設計強度を上回り、タービン翼の破壊に
つながる恐れがある。この事態を避けるため、従来の抽
気蒸気タービンプラントにおいては、安全性の観点から
タービン初段後圧力計１０と抽気蒸気圧力計１１でター
ビン段落間差圧を監視し、これがある規定値を上回った
場合、タービンをトリップさせるようにしているのが普
通であった。2. Description of the Related Art As an example of the above-described extraction steam turbine plant, a general system employed in a power generation steam turbine is shown in FIG. In the drawing, reference numeral 1 denotes a bleed condensing turbine, and 2 denotes a steam demand destination for supplying bleed steam from the turbine 1 (for example, steam auxiliary equipment such as a feed water heater or a deaerator, or steam as a private power plant). 3 is a bleed steam supply pipe drawn out of the intermediate stage of the bleed condensate turbine 1 and piped to the steam demand destination 2. 3 includes a bleed steam stop valve 5 and a bleed steam control valve 6
Is connected. In addition, 6a is a flow meter, 8 is a steam control valve connected to the main steam supply pipe 9 on the inlet side of the turbine 1, 2
0 is a generator driven by the turbine 1. The above-mentioned flow meter 6a is provided to detect the flow rate of the extracted steam flowing through the extracted steam supply pipe 3, and to send an opening signal to the extracted steam control valve 6 so that the extracted steam flow rate matches the required extracted steam flow rate. A differential pressure flowmeter using a flow nozzle, an orifice, or the like is generally employed. In the actual system, a control unit 21 is provided as in FIG. 2, and the flow rate signal from 6a enters the control unit 21, and the control unit 21 opens the bleed steam control valve 6 based on a deviation from the bleed steam request signal. A degree signal will be sent, but is omitted here. Reference numerals 10 and 11 denote a pressure gauge after the first stage of the turbine and a bleed steam pressure gauge,
These are provided to monitor the steam pressure and the extracted steam pressure at the steam inflow section to the turbine 1 respectively. Note that, in the above example, the case where the bleeding system is flow control is described as an example, but the bleeding system may be pressure controlled. In this case, a bleed steam control valve outlet pressure gauge is provided instead of the flow meter 6a, and the bleed steam control valve 6 is controlled by a detection signal of the pressure gauge. In the above system, FIG.
If the flow rate of the extracted steam flowing out of the turbine 1 through the extracted steam supply pipe 3 for some reason continues to increase beyond the planned value, the steam inlet of the turbine 1 is connected to the extracted steam supply pipe 3 as shown in FIG. The pressure difference between the running turbine stages increases. Due to the pressure difference between the stages, the turbine blades are pulled to the downstream side of the turbine, and in a plant where the required steam flow rate of the extracted steam is larger than the total steam flow rate, the generated pressure difference increases. The stress may exceed the design strength of the turbine blade, leading to turbine blade failure. In order to avoid this situation, in the conventional extraction steam turbine plant, the pressure difference between turbine stages is monitored by the pressure gauge 10 after the first stage of the turbine and the extraction steam pressure gauge 11 from the viewpoint of safety, and when the pressure exceeds a certain specified value. , It was common to trip the turbine.
【発明が解決しようとする課題】ところで、例えば商業
用発電設備において、タービントリップという事態によ
って発生する収入損はなるべく回避したいものである。
また、発電用タービンに限らずポンプ等の何がしかの負
荷を駆動する蒸気タービンにおいても、タービン本体以
外の原因によるタービントリップという事態は好ましく
ない。また、抽気蒸気がプロセス蒸気として用いられる
場合等は、抽気蒸気の確保も重要となる。前述したよう
な従来の抽気蒸気タービンプラント制御方式では、蒸気
需要先の異常によって、タービン本体が運転継続可能で
あるにもかかわらずタービントリップが発生する事態も
ありうる。本発明はこれに鑑みなされたもので、その目
的とするところは、このような事態、すなわちタービン
トリップが発生するような事態を避け、タービンの運転
継続を第一として、なおかつ安全性を損なわず、かつ抽
気蒸気の確保も可能な蒸気タービンプラントの運転方法
を提供することにある。By the way, in a commercial power generation facility, for example, it is desired to avoid a revenue loss caused by a turbine trip.
Further, not only in the power generation turbine, but also in a steam turbine that drives some load such as a pump, it is not preferable that a turbine trip occurs due to a cause other than the turbine body. Further, when the extracted steam is used as the process steam, it is important to secure the extracted steam. In the conventional extraction steam turbine plant control system as described above, a turbine trip may occur due to an abnormality in a steam demand destination even though the turbine body can be continuously operated. The present invention has been made in view of the above, and it is an object of the present invention to avoid such a situation, that is, a situation in which a turbine trip occurs, with the continuation of the operation of the turbine as a first, and without impairing safety. Another object of the present invention is to provide a method of operating a steam turbine plant that can secure extracted steam.
【課題を解決するための手段】すなわち本発明は、蒸気
タービンに供給された主蒸気の一部を蒸気タービンの中
間段から抽出し、かつ抽出した蒸気を抽気蒸気止め弁お
よび抽気蒸気加減弁を介して他の蒸気需要プロセスに供
給するように形成されている蒸気タービンプラントの運
転方法において、前記蒸気タービンへの流入主蒸気圧力
と前記抽気蒸気圧力との圧力差が予め定めた規定値を越
えた場合、前記抽気蒸気止め弁若しくは抽気蒸気加減弁
のいずれか一方，若しくは両方をほぼ全閉制御するよう
にし、所期の目的を達成するようにしたものである。ま
た本発明は、蒸気タービンに供給された主蒸気の一部を
蒸気タービンの中間段から抽出し、かつ抽出した蒸気を
抽気蒸気止め弁および抽気蒸気加減弁を介して他の蒸気
需要プロセスに供給するように形成されている蒸気ター
ビンプラントの運転方法において、前記抽気蒸気の圧力
が予め定めた警報規定値に到達した場合、警報を発する
とともに、前記抽気蒸気加減弁の開度をその位置で固定
若しくは絞り、さらに抽気流量が増加し前記蒸気タービ
ンへの蒸気流入部での蒸気圧力と抽気蒸気圧力との圧力
差が予め定めた規定値以上になった場合、前記抽気蒸気
止め弁若しくは抽気蒸気加減弁のいずれか一方，若しく
は両方をほぼ全閉に制御するようにしたものである。ま
たこの場合、前記警報規定値をタービン初段後圧力の関
数として設定するようにしたものである。また、前記抽
気蒸気の過大警報点抽気圧力をタービン初段後圧力の関
数として設定し、かつ警報点到達で警報を出すととも
に、前記抽気蒸気加減弁の開度をその位置で固定，若し
くは絞り、さらに抽気流量が増加し前記蒸気タービンへ
の蒸気流入部での蒸気圧力と抽気蒸気圧力との圧力差が
規定値以上になった場合、前記抽気蒸気止め弁、抽気蒸
気加減弁を全閉するようにしたものである。また、前記
抽気蒸気の過大警報点流量をタービン初段後圧力の関数
として設定し、かつ警報点到達で警報を出すとともに、
前記抽気蒸気加減弁の開度をその位置で固定、若しくは
絞り、さらに抽気流量が増加し前記蒸気タービンへの蒸
気流入部での蒸気圧力と抽気蒸気圧力との圧力差が規定
値以上になった場合に、前記抽気蒸気止め弁、抽気蒸気
加減弁を全閉するようにしたものである。また、前記抽
気蒸気の過大警報点抽気圧力をタービン主蒸気流量の関
数として設定し、警報点到達で警報を出すとともに前記
抽気蒸気加減弁の開度をその位置で固定，若しくは絞
り、さらに抽気流量が増加し前記蒸気タービンへの蒸気
流入部での蒸気圧力と抽気蒸気圧力との圧力差が規定値
以上になった場合、前記抽気蒸気止め弁、抽気蒸気加減
弁を全閉するようにしたものである。また、前記抽気蒸
気の過大警報点流量をタービン主蒸気流量の関数として
設定し、警報点到達で警報を出すとともに前記抽気蒸気
加減弁の開度をその位置で固定、若しくは絞り、さらに
抽気流量が増加し前記蒸気タービンへの蒸気流入部での
蒸気圧力と抽気蒸気圧力との圧力差が規定値以上になっ
た場合、前記抽気蒸気止め弁、抽気蒸気加減弁を全閉す
るようにしたものである。また、前記抽気蒸気の過大警
報点抽気圧力をタービン出力の関数として設定し、警報
点到達で警報を出すとともに前記抽気蒸気加減弁の開度
をその位置で固定、若しくは絞り、さらに抽気流量が増
加し前記蒸気タービンへの蒸気流入部での蒸気圧力と抽
気蒸気圧力との圧力差が規定値以上になった場合、前記
抽気蒸気止め弁、抽気蒸気加減弁を全閉するようにした
ものである。また、前記抽気蒸気の過大警報点流量をタ
ービン出力の関数として設定し、警報点到達で警報を出
すとともに前記抽気蒸気加減弁の開度をその位置で固
定、若しくは絞り、さらに抽気流量が増加し前記蒸気タ
ービンへの蒸気流入部での蒸気圧力と抽気蒸気圧力との
圧力差が規定値以上になった場合、前記抽気蒸気止め
弁、抽気蒸気加減弁を全閉するようにしたものである。
すなわちこのような蒸気タービンプラントの運転方法で
あると、蒸気タービンへの流入主蒸気圧力と抽気蒸気圧
力との圧力差が予め定めた規定値を越えた場合、抽気蒸
気止め弁（若しくは抽気蒸気加減弁あるいは両方）をほ
ぼ全閉制御するようにしたので、これによって抽気系統
への蒸気供給が停止され、前記の圧力差を緩和すること
で、タービンを運転継続したままタービン翼は保護され
るのである。また、抽気蒸気過大警報点（これは上記の
圧力差が規定値に達するより手前に設定する）を抽気蒸
気圧力または抽気蒸気流量でタービン初段後圧力（また
はタービン主蒸気流量、またはタービン出力）の関数と
して設定し、警報点到達で警報を出すとともに前記抽気
蒸気加減弁の開度を絞る（または開度を固定する）よう
制御するようにしたことにより、抽気蒸気の供給を停止
することなく抽気蒸気流量を警報点以上の増大を抑え、
圧力差が規定値に達しない様にすることができさらに安
全性の向上を図ることができるのである。That is, according to the present invention, a part of the main steam supplied to the steam turbine is extracted from an intermediate stage of the steam turbine, and the extracted steam is provided to an extraction steam stop valve and an extraction steam control valve. In a method of operating a steam turbine plant configured to supply to another steam demand process via a steam turbine, the pressure difference between the main steam pressure flowing into the steam turbine and the bleed steam pressure exceeds a predetermined value. In this case, one or both of the bleed steam stop valve and the bleed steam control valve are controlled to be almost fully closed to achieve the intended purpose. Further, the present invention extracts a part of the main steam supplied to the steam turbine from an intermediate stage of the steam turbine, and supplies the extracted steam to another steam demanding process via a bleed steam stop valve and a bleed steam control valve. When the pressure of the extracted steam reaches a predetermined alarm specified value, an alarm is issued and the opening of the extracted steam control valve is fixed at that position. Alternatively, if the pressure difference between the steam pressure at the steam inlet to the steam turbine and the extracted steam pressure becomes greater than or equal to a predetermined value, the bleed steam stop valve or the bleed steam control is performed. One or both of the valves are controlled to be almost fully closed. In this case, the specified alarm value is set as a function of the pressure after the first stage of the turbine. In addition, the bleed steam excessive alarm point bleed pressure is set as a function of the pressure after the first stage of the turbine, and a warning is issued when the warning point is reached, and the opening of the bleed steam control valve is fixed or throttled at that position. When the flow rate of the bleed air is increased and the pressure difference between the steam pressure at the steam inflow section to the steam turbine and the bleed steam pressure becomes a specified value or more, the bleed steam stop valve and the bleed steam control valve are fully closed. It was done. Further, the excessive alarm point flow rate of the extracted steam is set as a function of the pressure after the first stage of the turbine, and an alarm is issued when the alarm point is reached,
The degree of opening of the bleed steam control valve was fixed or throttled at that position, and further the bleed flow increased, and the pressure difference between the steam pressure at the steam inlet to the steam turbine and the bleed steam pressure exceeded a specified value. In this case, the extraction steam stop valve and the extraction steam control valve are fully closed. Further, the extraction pressure at the excessive warning point of the bleed steam is set as a function of the turbine main steam flow rate, an alarm is issued when the warning point is reached, and the opening of the bleed steam control valve is fixed or throttled at that position. When the pressure difference between the steam pressure at the steam inflow section into the steam turbine and the extracted steam pressure exceeds a specified value, the extracted steam stop valve and the extracted steam control valve are fully closed. It is. In addition, an excessive alarm point flow rate of the bleed steam is set as a function of the turbine main steam flow rate, an alarm is issued when the alarm point is reached, and the opening of the bleed steam control valve is fixed or throttled at that position, and the bleed flow rate is further reduced. When the pressure difference between the steam pressure at the steam inlet to the steam turbine and the extracted steam pressure becomes equal to or greater than a specified value, the extracted steam stop valve and the extracted steam control valve are fully closed. is there. Further, the extraction pressure at the excessive warning point of the extracted steam is set as a function of the turbine output, an alarm is issued when the alarm point is reached, and the opening degree of the extracted steam control valve is fixed or throttled at that position, and the extraction flow rate is further increased. When the pressure difference between the steam pressure at the steam inlet to the steam turbine and the extracted steam pressure becomes equal to or greater than a specified value, the extracted steam stop valve and the extracted steam control valve are fully closed. . In addition, an excessive alarm point flow rate of the bleed steam is set as a function of the turbine output, an alarm is issued when the alarm point is reached, and the opening degree of the bleed steam control valve is fixed or throttled at that position, and the bleed flow rate further increases. When the pressure difference between the steam pressure at the steam inlet to the steam turbine and the bleed steam pressure becomes equal to or greater than a specified value, the bleed steam stop valve and the bleed steam control valve are fully closed.
That is, according to such a method of operating the steam turbine plant, when the pressure difference between the main steam pressure flowing into the steam turbine and the bleed steam pressure exceeds a predetermined value, the bleed steam stop valve (or the bleed steam control). Valve or both), the steam supply to the bleed air system is stopped, and the pressure difference is reduced, so that the turbine blades are protected while the turbine continues to operate. is there. Also, an excessive steam extraction alarm point (which is set before the pressure difference reaches the specified value) is set at the turbine post-stage pressure (or turbine main steam flow or turbine output) with the steam extraction pressure or steam extraction flow rate. By setting as a function, an alarm is issued when the alarm point is reached, and the opening of the bleed steam control valve is controlled to be narrowed (or the opening is fixed), so that the bleed steam is not stopped and the bleed steam is not supplied. Suppress the increase of steam flow above the warning point,
The pressure difference can be prevented from reaching the specified value, and the safety can be further improved.
【発明の実施の形態】以下図示した実施例に基づいて本
発明を詳細に説明する。図１にはその抽気蒸気タービン
プラント（発電用蒸気タービンの場合）の系統が示され
ている。勿論、ポンプ等の負荷を駆動する場合も同様な
系統となる。まず全体構成を説明すると、１は抽気復水
タービン、２はタービン１からの抽気蒸気を供給する蒸
気需要先（例えば、給水加熱器や脱気器等のタービン補
器類、または自家用発電プラントとして蒸気を利用して
工場での生産物を加工するプロセス等）、３はタービン
１の中間段（前記中間段はタービン１が高圧、中圧、低
圧タービンなどに分かれている場合には、高圧タービン
と中圧タービンの間、若しくは中圧タービンと低圧ター
ビンの間、若しくは高圧タービンと低圧タービンの間も
含む）から引き出して蒸気需要先２との間に配管した抽
気蒸気供給管であり、抽気蒸気供給管３には抽気蒸気止
め弁５、抽気蒸気加減弁６、が接続されている。６ａは
流量計、８はタービン１の入口側の主蒸気供給管９に接
続した蒸気加減弁、２０はタービン１が駆動する発電機
である。１０，１１はそれぞれタービン初段後圧力計、
抽気蒸気圧力計であり、それぞれタービン１への蒸気流
入部での蒸気圧力と抽気蒸気圧力を監視する。２１は制
御部であり、通常時の制御では流量計６ａで抽気蒸気供
給管路３を流れる抽気蒸気の流量を検出し、制御部から
抽気蒸気流量が抽気蒸気要求流量に一致するよう抽気蒸
気加減弁６に開度信号を送る流量制御を行う。２２は警
報装置である。上記の構成において、制御部２１には図
３に示されているようなタービン初段後圧力計１０から
の圧力信号に対する抽気蒸気過大警報点流量が設定して
あり、抽気系統での抽気蒸気流量が何らかの原因で増大
した結果流量計６ａからの実抽気蒸気流量信号が抽気蒸
気過大警報点流量を超過した場合、警報点到達として制
御部２１から警報２２に警報信号を送るとともに、抽気
蒸気加減弁６の開度を図４に示すようなレートで閉方向
に絞る様、制御部２１から抽気蒸気加減弁６へ開度信号
を送る。さらに抽気流量が増加し続け、タービン初段後
圧力計１０からの圧力信号と抽気蒸気圧力計１１からの
圧力信号との圧力差が予め定めた規定値以上になった場
合、制御部２１から抽気蒸気止め弁５、抽気蒸気加減弁
６へ全閉信号を送る。図６にはこの制御のインターロッ
クブロック線図が示されている。なお、本発明は上記し
た運転方法に限定されるものではなく、抽気系統を圧力
制御としても良い。この場合、流量計６ａの代わりに抽
気蒸気加減弁出口圧力計を設置し、通常時の制御ではこ
の圧力計の検出信号で抽気蒸気加減弁６を制御する。つ
まり制御部２１はこの抽気蒸気加減弁出口圧力計からの
圧力信号が抽気蒸気要求圧力信号と一致するよう抽気蒸
気加減弁６に開度信号を出す。また、抽気蒸気過大警報
点は抽気蒸気圧力で定める。また、抽気蒸気過大警報点
到達の場合、抽気蒸気加減弁６の開度を固定しても良
い。また、図３においては抽気蒸気過大警報点はタービ
ン初段後圧力の関数として示しているが、タービン主蒸
気流量またはタービン出力の関数とすることもできる。
以上説明してきたように本実施例によれば、抽気系統で
の抽気蒸気流量が何らかの原因で増大した場合、段落間
差圧が規定値以下において抽気蒸気過大警報点を設定し
ており、警報点到達で抽気蒸気加減弁の開度を絞るか、
または固定するため抽気蒸気の供給を停止すること無く
抽気蒸気流量の増大を抑える効果がある。また、段落間
差圧が規定値以上になった時には抽気系統への蒸気供給
を停止（あるいはほぼ停止状態と）し、段落間差圧を緩
和することで、タービンを運転継続したままタービン翼
の保護を実現する効果がある。つまり蒸気需要先および
タービンの各々の運用継続範囲が拡大し、さらにはター
ビンに対する二重の保護装置による信頼性向上の効果が
ある。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. FIG. 1 shows a system of the extraction steam turbine plant (in the case of a power generation steam turbine). Of course, a similar system is used for driving a load such as a pump. First, the overall configuration will be described. 1 is a bleed condensing turbine, 2 is a steam demand destination for supplying bleed steam from the turbine 1 (for example, as a turbine accessory such as a feed water heater or a deaerator, or as a private power plant). 3 is an intermediate stage of the turbine 1 (the intermediate stage is a high-pressure turbine when the turbine 1 is divided into a high-pressure, a medium-pressure, a low-pressure turbine, etc.). And a medium-pressure turbine, or between a medium-pressure turbine and a low-pressure turbine, and also between a high-pressure turbine and a low-pressure turbine). An extraction steam stop valve 5 and an extraction steam control valve 6 are connected to the supply pipe 3. 6a is a flow meter, 8 is a steam control valve connected to the main steam supply pipe 9 on the inlet side of the turbine 1, and 20 is a generator driven by the turbine 1. 10 and 11 are pressure gauges after the first stage of the turbine, respectively.
An extraction steam pressure gauge monitors the steam pressure and the extraction steam pressure at the steam inflow section to the turbine 1 respectively. Reference numeral 21 denotes a control unit. In normal control, the flow rate of the extracted steam flowing through the extracted steam supply line 3 is detected by the flow meter 6a, and the control unit controls the extracted steam flow to match the extracted steam required flow rate. A flow control for sending an opening signal to the valve 6 is performed. 22 is an alarm device. In the above-described configuration, the control unit 21 sets the bleed steam excessive warning point flow rate for the pressure signal from the pressure gauge 10 after the first stage of the turbine as shown in FIG. If the actual bleed steam flow rate signal from the flow meter 6a exceeds the bleed steam excessive warning point flow rate as a result of an increase due to some cause, a warning signal is sent from the control unit 21 to the alarm 22 as reaching a warning point, and the bleed steam control valve 6 An opening signal is sent from the control unit 21 to the bleed steam control valve 6 so as to narrow the opening of the bleeding steam in the closing direction at a rate as shown in FIG. Further, when the flow rate of the bleed air continues to increase and the pressure difference between the pressure signal from the pressure gauge 10 after the first stage of the turbine and the pressure signal from the bleed steam pressure gauge 11 exceeds a predetermined value, the controller 21 A fully closed signal is sent to the stop valve 5 and the bleed steam control valve 6. FIG. 6 shows an interlock block diagram of this control. Note that the present invention is not limited to the above-described operation method, and the bleeding system may be pressure-controlled. In this case, a bleed steam control valve outlet pressure gauge is installed instead of the flow meter 6a, and in normal control, the bleed steam control valve 6 is controlled by a detection signal of the pressure gauge. That is, the control unit 21 sends an opening signal to the bleed steam control valve 6 such that the pressure signal from the bleed steam control valve outlet pressure gauge matches the bleed steam request pressure signal. In addition, the extraction steam excess alarm point is determined by the extraction steam pressure. In the case of reaching the bleed steam excessive alarm point, the opening of the bleed steam control valve 6 may be fixed. Further, in FIG. 3, the bleed steam excessive alarm point is shown as a function of the pressure after the first stage of the turbine, but it may be a function of the turbine main steam flow rate or the turbine output.
As described above, according to the present embodiment, when the extraction steam flow rate in the extraction system is increased for some reason, the extraction steam excess alarm point is set when the pressure difference between paragraphs is equal to or less than the specified value, and the alarm point is set. Or the throttle opening of the bleed steam control valve
Alternatively, there is an effect of suppressing an increase in the flow rate of the extracted steam without stopping the supply of the extracted steam for fixing. In addition, when the pressure difference between paragraphs exceeds the specified value, the steam supply to the bleed air system is stopped (or almost stopped), and the pressure difference between paragraphs is alleviated. It has the effect of providing protection. That is, the operation continuation range of each of the steam demand destination and the turbine is expanded, and further, the effect of improving the reliability by the dual protection device for the turbine is obtained.
【発明の効果】以上説明してきたように本発明によれ
ば、タービントリップが発生するような事態を避けるこ
とができ、タービンの運転継続を第一として、なおかつ
安全性を損なわず、抽気蒸気の遮断あるいは確保も可能
なこの種の蒸気タービンプラントの運転方法を得ること
ができる。As described above, according to the present invention, it is possible to avoid a situation in which a turbine trip occurs, and to keep the operation of the turbine first, without impairing the safety and without removing the extracted steam. It is possible to obtain a steam turbine plant operating method of this type that can be shut down or secured.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本発明の運転方法を説明するための蒸気タービ
ンプラントの一実施例を示す系統図である。FIG. 1 is a system diagram showing one embodiment of a steam turbine plant for explaining an operation method of the present invention.
【図２】従来の蒸気タービンプラントの系統図である。FIG. 2 is a system diagram of a conventional steam turbine plant.
【図３】本発明の制御部内に定めた抽気蒸気過大警報点
の一例を示す図である。FIG. 3 is a diagram showing an example of a bleed steam excessive alarm point set in a control unit of the present invention.
【図４】本発明の制御部内に定めた抽気加減弁弁開度制
御方法の一例を示す図である。FIG. 4 is a diagram illustrating an example of a method of controlling the degree of opening of a bleed control valve determined in a control unit according to the present invention.
【図５】タービン軸方向の圧力勾配分布と段落間差圧の
変化を示す図である。FIG. 5 is a diagram showing a pressure gradient distribution in a turbine axial direction and a change in a differential pressure between paragraphs.
【図６】本発明のインターロックブロック線図の一実施
例図である。FIG. 6 is an embodiment of an interlock block diagram of the present invention.
１…タービン、２…蒸気需要先、３…抽気蒸気供給管、
５…抽気蒸気止め弁、６…抽気加減弁、６ａ…流量計、
８…蒸気加減弁、９…主蒸気供給管、１０…タービン初
段後圧力計、１１…抽気蒸気圧力計、２０…発電機、２
１…制御部、２２…警報装置。1. Turbine 2. Steam demand destination 3. Extracted steam supply pipe,
5 ... bleed steam stop valve, 6 ... bleed control valve, 6a ... flow meter,
Reference numeral 8: steam control valve, 9: main steam supply pipe, 10: pressure gauge after the first stage of turbine, 11: extraction steam pressure gauge, 20: generator, 2
1 ... Control unit, 22 ... Alarm device.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 永井 信一 茨城県日立市幸町三丁目１番１号 株式会 社日立製作所日立工場内 Ｆターム(参考） 3G071 AA02 AB01 BA21 BA24 CA09 DA11 EA02 EA06 FA03 FA05 GA06 HA03 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Shinichi Nagai 3-1-1, Sakaimachi, Hitachi-shi, Ibaraki F-term inside Hitachi Works, Ltd. Hitachi Plant 3G071 AA02 AB01 BA21 BA24 CA09 DA11 EA02 EA06 FA03 FA05 GA06 HA03
Claims (9)
を蒸気タービンの中間段から抽出し、かつ抽出した蒸気
を抽気蒸気止め弁および抽気蒸気加減弁を介して他の蒸
気需要プロセスに供給するように形成されている蒸気タ
ービンプラントの運転方法において、 前記蒸気タービンへの流入主蒸気圧力と前記抽気蒸気圧
力との圧力差が予め定めた規定値を越えた場合、前記抽
気蒸気止め弁若しくは抽気蒸気加減弁のいずれか一方，
若しくは両方をほぼ全閉制御するようにしたことを特徴
とする蒸気タービンプラントの運転方法。1. A part of main steam supplied to a steam turbine is extracted from an intermediate stage of the steam turbine, and the extracted steam is supplied to another steam demanding process via a bleed steam stop valve and a bleed steam control valve. In the method of operating a steam turbine plant configured to perform, when the pressure difference between the main steam pressure flowing into the steam turbine and the bleed steam pressure exceeds a predetermined value, the bleed steam stop valve or One of the bleed steam control valve,
Alternatively, a method of operating a steam turbine plant, wherein both are almost fully closed.
を蒸気タービンの中間段から抽出し、かつ抽出した蒸気
を抽気蒸気止め弁および抽気蒸気加減弁を介して他の蒸
気需要プロセスに供給するように形成されている蒸気タ
ービンプラントの運転方法において、 前記抽気蒸気の圧力が予め定めた警報規定値に到達した
場合、警報を発するとともに、前記抽気蒸気加減弁の開
度をその位置で固定若しくは絞り、さらに抽気流量が増
加し前記蒸気タービンへの蒸気流入部での蒸気圧力と抽
気蒸気圧力との圧力差が予め定めた規定値以上になった
場合、前記抽気蒸気止め弁若しくは抽気蒸気加減弁のい
ずれか一方，若しくは両方をほぼ全閉に制御するように
したことを特徴とする蒸気タービンプラントの運転方
法。2. A part of the main steam supplied to the steam turbine is extracted from an intermediate stage of the steam turbine, and the extracted steam is supplied to another steam demanding process via a bleed steam stop valve and a bleed steam control valve. In the method of operating a steam turbine plant configured to perform, when the pressure of the extracted steam reaches a predetermined alarm specified value, an alarm is issued and the opening of the extracted steam control valve is fixed at that position. Alternatively, if the pressure difference between the steam pressure at the steam inlet to the steam turbine and the extracted steam pressure becomes greater than or equal to a predetermined value, the bleed steam stop valve or the bleed steam control is performed. A method for operating a steam turbine plant, wherein one or both of the valves are controlled to be almost fully closed.
関数として設定するようにしたものである請求項２記載
の蒸気タービンプラントの運転方法。3. The method of operating a steam turbine plant according to claim 2, wherein the specified alarm value is set as a function of the pressure after the first stage of the turbine.
ービン初段後圧力の関数として設定し、かつ警報点到達
で警報を出すとともに、前記抽気蒸気加減弁の開度をそ
の位置で固定，若しくは絞り、さらに抽気流量が増加し
前記蒸気タービンへの蒸気流入部での蒸気圧力と抽気蒸
気圧力との圧力差が規定値以上になった場合、前記抽気
蒸気止め弁、抽気蒸気加減弁を全閉するようにしたもの
である請求項２記載の蒸気タービンプラントの運転方
法。4. The extraction pressure at the excessive alarm point of the extracted steam is set as a function of the pressure after the first stage of the turbine, and an alarm is issued when the alarm point is reached, and the opening of the extraction steam control valve is fixed at that position, or If the pressure difference between the steam pressure at the steam inflow section to the steam turbine and the extracted steam pressure becomes equal to or greater than a specified value, the extraction steam stop valve and the extraction steam control valve are fully closed. The method for operating a steam turbine plant according to claim 2, wherein the operation is performed.
ン初段後圧力の関数として設定し、かつ警報点到達で警
報を出すとともに、前記抽気蒸気加減弁の開度をその位
置で固定、若しくは絞り、さらに抽気流量が増加し前記
蒸気タービンへの蒸気流入部での蒸気圧力と抽気蒸気圧
力との圧力差が規定値以上になった場合に、前記抽気蒸
気止め弁、抽気蒸気加減弁を全閉するようにしたもので
ある請求項２記載の蒸気タービンプラントの運転方法。5. An excessive alarm point flow rate of the extracted steam is set as a function of the pressure after the first stage of the turbine, an alarm is issued when an alarm point is reached, and the opening degree of the extracted steam control valve is fixed at that position or the throttle is restricted. When the flow rate of the bleed air further increases and the pressure difference between the steam pressure at the steam inflow portion to the steam turbine and the bleed steam pressure exceeds a specified value, the bleed steam stop valve and the bleed steam control valve are fully closed. The method for operating a steam turbine plant according to claim 2, wherein the operation is performed.
ービン主蒸気流量の関数として設定し、警報点到達で警
報を出すとともに前記抽気蒸気加減弁の開度をその位置
で固定，若しくは絞り、さらに抽気流量が増加し前記蒸
気タービンへの蒸気流入部での蒸気圧力と抽気蒸気圧力
との圧力差が規定値以上になった場合、前記抽気蒸気止
め弁、抽気蒸気加減弁を全閉するようにしたものである
請求項２記載の蒸気タービンプラントの運転方法。6. An excessive alarm point extraction pressure of the extracted steam is set as a function of a turbine main steam flow rate, an alarm is issued when an alarm point is reached, and an opening degree of the extraction steam control valve is fixed or throttled at that position. When the flow rate of the bleed air further increases and the pressure difference between the steam pressure at the steam inflow section to the steam turbine and the bleed steam pressure becomes a specified value or more, the bleed steam stop valve and the bleed steam control valve are fully closed. The method for operating a steam turbine plant according to claim 2, wherein:
ン主蒸気流量の関数として設定し、警報点到達で警報を
出すとともに前記抽気蒸気加減弁の開度をその位置で固
定、若しくは絞り、さらに抽気流量が増加し前記蒸気タ
ービンへの蒸気流入部での蒸気圧力と抽気蒸気圧力との
圧力差が規定値以上になった場合、前記抽気蒸気止め
弁、抽気蒸気加減弁を全閉するようにしたものである請
求項２記載の蒸気タービンプラントの運転方法。7. An excessive alarm point flow rate of the extracted steam is set as a function of a turbine main steam flow rate, an alarm is issued when an alarm point is reached, and the opening degree of the extracted steam control valve is fixed or throttled at that position. When the flow rate of the bleed air is increased and the pressure difference between the steam pressure at the steam inflow section to the steam turbine and the bleed steam pressure becomes a specified value or more, the bleed steam stop valve and the bleed steam control valve are fully closed. The method for operating a steam turbine plant according to claim 2, wherein:
ービン出力の関数として設定し、警報点到達で警報を出
すとともに前記抽気蒸気加減弁の開度をその位置で固
定、若しくは絞り、さらに抽気流量が増加し前記蒸気タ
ービンへの蒸気流入部での蒸気圧力と抽気蒸気圧力との
圧力差が規定値以上になった場合、前記抽気蒸気止め
弁、抽気蒸気加減弁を全閉するようにしたものである請
求項２記載の蒸気タービンプラントの運転方法。8. An extraction pressure for an excessive warning point of the bleed steam is set as a function of a turbine output, an alarm is issued when a warning point is reached, and the opening of the bleed steam control valve is fixed or throttled at that position. When the flow rate increases and the pressure difference between the steam pressure at the steam inflow section to the steam turbine and the extracted steam pressure exceeds a specified value, the extracted steam stop valve and the extracted steam control valve are fully closed. The method for operating a steam turbine plant according to claim 2, wherein
ン出力の関数として設定し、警報点到達で警報を出すと
ともに前記抽気蒸気加減弁の開度をその位置で固定、若
しくは絞り、さらに抽気流量が増加し前記蒸気タービン
への蒸気流入部での蒸気圧力と抽気蒸気圧力との圧力差
が規定値以上になった場合、前記抽気蒸気止め弁、抽気
蒸気加減弁を全閉するようにしたものである請求項２記
載の蒸気タービンプラントの運転方法。9. An excessive alarm point flow rate of the bleed steam is set as a function of the turbine output, an alarm is issued when the alarm point is reached, and the opening of the bleed steam control valve is fixed or throttled at that position. When the pressure difference between the steam pressure at the steam inflow section into the steam turbine and the extracted steam pressure exceeds a specified value, the extracted steam stop valve and the extracted steam control valve are fully closed. The method for operating a steam turbine plant according to claim 2, wherein
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06185299A JP3615077B2 (en) | 1999-03-09 | 1999-03-09 | Operation method of steam turbine plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06185299A JP3615077B2 (en) | 1999-03-09 | 1999-03-09 | Operation method of steam turbine plant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000257405A true JP2000257405A (en) | 2000-09-19 |
| JP3615077B2 JP3615077B2 (en) | 2005-01-26 |
Family
ID=13183053
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06185299A Expired - Fee Related JP3615077B2 (en) | 1999-03-09 | 1999-03-09 | Operation method of steam turbine plant |
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| Country | Link |
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| JP (1) | JP3615077B2 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007046576A (en) * | 2005-08-12 | 2007-02-22 | Hitachi Ltd | Steam turbine power generation plant and its control method |
| JP2007309194A (en) * | 2006-05-18 | 2007-11-29 | Hitachi Ltd | Steam turbine plant |
| CN103104303A (en) * | 2012-10-24 | 2013-05-15 | 云南丰普科技有限公司 | Turbine steam extraction system with adjustable extraction flow of steam |
| JP2013124560A (en) * | 2011-12-13 | 2013-06-24 | Jfe Steel Corp | Turbine bypass device and turbine bypass control method |
| CN106761963A (en) * | 2016-12-01 | 2017-05-31 | 华电能源股份有限公司哈尔滨第三发电厂 | A kind of steam turbine control operation method |
| JP2018062880A (en) * | 2016-10-12 | 2018-04-19 | 三浦工業株式会社 | Power system |
| JP2019007391A (en) * | 2017-06-22 | 2019-01-17 | 住友金属鉱山株式会社 | Steam extraction control method for steam turbine generator |
| CN110374694A (en) * | 2019-06-05 | 2019-10-25 | 陕西渭河发电有限公司 | A kind of high back pressure thermal power plant unit method of controlling security |
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1999
- 1999-03-09 JP JP06185299A patent/JP3615077B2/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007046576A (en) * | 2005-08-12 | 2007-02-22 | Hitachi Ltd | Steam turbine power generation plant and its control method |
| JP4528693B2 (en) * | 2005-08-12 | 2010-08-18 | 株式会社日立製作所 | Steam turbine power plant and control method thereof |
| JP2007309194A (en) * | 2006-05-18 | 2007-11-29 | Hitachi Ltd | Steam turbine plant |
| US7392656B2 (en) | 2006-05-18 | 2008-07-01 | Hitachi, Ltd. | Steam turbine plant |
| KR101006637B1 (en) | 2006-05-18 | 2011-01-07 | 가부시키가이샤 히타치세이사쿠쇼 | Steam turbine plant |
| JP2013124560A (en) * | 2011-12-13 | 2013-06-24 | Jfe Steel Corp | Turbine bypass device and turbine bypass control method |
| CN103104303A (en) * | 2012-10-24 | 2013-05-15 | 云南丰普科技有限公司 | Turbine steam extraction system with adjustable extraction flow of steam |
| JP2018062880A (en) * | 2016-10-12 | 2018-04-19 | 三浦工業株式会社 | Power system |
| CN106761963A (en) * | 2016-12-01 | 2017-05-31 | 华电能源股份有限公司哈尔滨第三发电厂 | A kind of steam turbine control operation method |
| JP2019007391A (en) * | 2017-06-22 | 2019-01-17 | 住友金属鉱山株式会社 | Steam extraction control method for steam turbine generator |
| CN110374694A (en) * | 2019-06-05 | 2019-10-25 | 陕西渭河发电有限公司 | A kind of high back pressure thermal power plant unit method of controlling security |
| CN112049700A (en) * | 2020-07-23 | 2020-12-08 | 华电电力科学研究院有限公司 | Comprehensive energy system utilizing cogeneration of high-parameter heat supply steam complementary energy and control method thereof |
| CN112049700B (en) * | 2020-07-23 | 2021-03-26 | 华电电力科学研究院有限公司 | Comprehensive energy system utilizing cogeneration of high-parameter heat supply steam complementary energy and control method thereof |
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