JP3777273B2 - Emergency control device - Google Patents

Emergency control device Download PDF

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Publication number
JP3777273B2
JP3777273B2 JP23085799A JP23085799A JP3777273B2 JP 3777273 B2 JP3777273 B2 JP 3777273B2 JP 23085799 A JP23085799 A JP 23085799A JP 23085799 A JP23085799 A JP 23085799A JP 3777273 B2 JP3777273 B2 JP 3777273B2
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valve
oil
emergency
control device
control
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JP2001055903A (en
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朋男 大藤
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Toshiba Corp
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Toshiba Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]

Description

【０００１】
【発明の属する技術分野】
本発明は、コンバインドサイクル発電プラントに適用される燃料弁や蒸気タービンプラントに適用される蒸気弁を危急時、急速閉鎖させる非常用制御装置に関する。
【０００２】
【従来の技術】
非常用制御装置は、コンバインドサイクル発電プラントや蒸気タービンプラントに適用される燃料弁や蒸気弁に対し、制御油供給源から供給される制御油（高圧の圧力油）を非常油として各弁の非常用供給管へ案内するものであり、燃料弁や蒸気弁を急速閉鎖する必要が生じた際、非常油をドレンとして排出させ、その圧力油を瞬時に低下させて各弁を急速閉鎖させる機能を持つものである。
【０００３】
この非常用制御装置は、図２に示すように、マスタートリップ弁１に第１電磁弁２および第２電磁弁３を組み合せて構成されている。
【０００４】
マスタートリップ弁１には、通常運転時、制御油供給源からの制御油がポートＸ，Ｐのそれぞれに供給されている。
【０００５】
ポートＰに供給された制御油は、スプール４、ポートＢを介して非常油として燃料弁や蒸気弁を開閉させる駆動弁に供給されている。
【０００６】
また、ポートＸに供給された制御油は、オリフィス５で減圧された後、第１通路６を介してその一部をスプール４に供給し、スプール４を図示の位置に維持させるとともに、残りを第１電磁弁２に供給し、第１電磁弁２のスプール７を図示の位置に維持させ、第１電磁弁２を閉止させている。なお、第１通路６は、第１電磁弁２のスプール７、第２通路８、第２電磁弁３のスプール９を介して第３通路１０に連通している。
【０００７】
このような構成を備えた非常用制御装置において、タービントリップ等の危急事態が発生すると、第１電磁弁２および第２電磁弁３は、ともに指令部から緊急指令信号により、スプール７，９を図示の位置から右側の方向に移動させ、第１通路６を第２通路８を介して第３通路１０に連通させる。このとき、ポートＸに供給されていた制御油は、第１通路６から第２通路８を介して第３通路１０に流れ、ここからドレンとして排出される。
【０００８】
制御油が第３通路１０からドレンとして排出されると、第１通路６の圧力油は低下する。このとき、スプール４は、バネ１１の弾性力により図示の位置から左側の破線の位置に移動し、非常油の出口であるポートＢをスプール４の通路１２を介してポートＴに連通させ、スプール４内の圧力油をドレン排出させ、非常油の圧力を低下させる。このとき、同時に、ポートＰとポートＡとは互いに連通するので、制御油供給源からの制御油の流れは断たれる。
【０００９】
このように、従来の非常用制御装置は、緊急時、制御油供給源からマスタートリップ弁１に供給する制御油を断つとともに、マスタートリップ弁１内の非常油をドレンとして抜き、燃料弁や蒸気弁を開閉駆動する駆動弁への圧力油の供給を断ち、燃料弁等を急速閉鎖させ、ガスタービンや蒸気タービンのオーバスピード等、暴走事故を未然に防止していた。
【００１０】
なお、第１電磁弁２および第２電磁弁３はともに、リミットスイッチ１３，１４を備え、緊急時、各スプール７，９が確実に作動するかのテストがマスタートリップ弁１のスプールとは無関係に行われており、そのときの各スプール７，９の作動をリミットスイッチ１３，１４で確認している。
【００１１】
【発明が解決しようとする課題】
図２で示した従来の非常用制御装置は、非常油を給排する必要上、マスタートリップ弁１のスプール４と摺動面１５との間に隙間を設けているが、この隙間に異物が詰り、スプール４の動作不良を起すことがあった。スプール４の動作不良を防止するために、摺動面１５の隙間を大きくすることも考えられるが、隙間の増加は圧力油の漏れの増加につながり、圧力油供給源の負担増になるだけの無駄なエネルギ消費になっている。
【００１２】
また、第１電磁弁２のテスト時、マスタートリップ弁１の第１通路６から第２通路８に供給される制御油が充満する間に、スプール４の摺動面１５から制御油が漏れ、この影響で第１通路６に供給される制御油の圧力が低下し、非常用制御装置はスプール４に誤操作させることがあった。
【００１３】
本発明は、このような事情を考慮してなされたもので、マスタートリップ弁を複数のポペット弁を組み合せて置き換え、摺動面をより一層少なくさせて緊急時およびテスト時の弁誤動作を確実に防止する非常用制御装置を提供することを目的とする。
【００１４】
【課題を解決するための手段】
本発明に係る非常用制御装置は、上記目的を達成するために、請求項１に記載したように、制御油源からの制御油を非常油として燃料弁および蒸気弁のうち、少なくともいずれか一方に供給して開弁させる遮断弁と、非常時、上記遮断弁から上記燃料弁および蒸気弁のうち、少なくともいずれか一方に供給していた非常油の圧力を低下させるトリップ弁と、上記遮断弁を閉弁させて上記制御油源からの制御油の供給を断つ切替弁と、上記制御油源からの制御油をドレン化する複数の電磁弁を直接接続させる第１圧力油供給系と、この第１圧力油供給系の中間部分に接続され、上記遮断弁の出口側からバイパスする第２圧力油供給系とを備えたものである。
【００１５】
また、本発明に係る非常用制御装置は、上記目的を達成するために、請求項２に記載したように、第２圧力油供給系にオリフィスを設け、テスト前の電磁弁に減圧した圧力油を背圧として与えるものである。
【００１６】
また、本発明に係る非常用制御装置は、上記目的を達成するために、請求項３に記載したように、遮断弁は、バネと弁体とを組み合せたポペットタイプに形成したものである。
【００１７】
また、本発明に係る非常用制御装置は、上記目的を達成するために、請求項４に記載したように、トリップ弁は、バネと弁体とを組み合せたポペットタイプに形成したものである。
【００１８】
【発明の実施の形態】
以下、本発明に係る非常用制御装置の実施形態を図面および図面に付した符号を用いて説明する。
【００１９】
図１は本発明に係る非常用制御装置の実施形態を示す概略系統図である。
【００２０】
本発明に係る非常用制御装置は、制御油源から供給される制御油により作動するポペットタイプの遮断弁１６と負荷遮断等のトリップ時、遮断弁１６を圧力油により駆動する切替弁１７とを備えた構成になっている。
【００２１】
また、本発明に係る非常用制御装置は、トリップ時、遮断弁１６から燃料弁または蒸気弁等（ともに図示せず）に供給していた非常油の圧力を下げて燃料弁等を閉鎖させるポペットタイプのトリップ弁１８を第１電磁弁１９ａおよび第２電磁弁１９ｂに第１圧力油供給系３０を介して順次直列に接続する構成になっている。
【００２２】
また、第１電磁弁１９ａおよび第２電磁弁１９ｂのそれぞれは、ともに、スプール２０ａ，２０ｂを作動させるスプール駆動部２１ａ，２１ｂと、通常運転中にテストするスプール２０ａ，２０ｂの作動有無を確認するリミットスイッチ２２ａ，２２ｂとを備えている。
【００２３】
また、第１電磁弁１９ａと第２電磁弁１９ｂとを互いに接続させる第１圧力油供給系３０には、遮断弁１６のポートＡの出口側からバイパスし、オリフィス２９を備えた第２圧力油供給系３１が設けられている。この第２圧力油供給系３１は、後述する第１電磁弁１９ａ、第２電磁弁１９ｂのテスト運転をするとき、例えば第２電磁弁１９ｂのテスト終了後、第１電磁弁１９ａに移行する際、オリフィス２９で減圧した圧力油を第１電磁弁１９ａに予め背圧として与えておき、第１電磁弁１９ａに空気溜りの発生を防止し、誤動作を起させないようにしている。なお、テストは、第１電磁弁１９ａ、第２電磁弁１９ｂのうち、いずれを先に行ってもよいが、遮断弁１６、切替弁１７、トリップ弁１８のそれぞれに悪影響を与えないよう、各電磁弁１９ａ，１９ｂ毎に行う。
【００２４】
また、ポペットタイプの遮断弁１６およびトリップ弁１８のそれぞれは、ともに、バネ２３ａ，２３ｂで支持された弁体２４ａ，２４ｂを収容し、供給される圧力油の高低により弁体２４ａ，２４ｂを作動させる簡易な構成になっている。
【００２５】
このような構成を備えた非常用制御装置において、起動運転時、制御油源から供給される制御油Ｈ０は要約すると、３つの系統に振り分けられる。
【００２６】
まず、ポペットタイプの遮断弁１６のポートＢに供給された制御油Ｈ０は、バネ２３ａの弾性力に打ち勝って弁体２４を図示の位置から右側に移動させ、ポートＢとポートＡとを互いに連通させ、非常油Ｅ０として燃料弁等の弁駆動部（図示せず）に供給され、燃料弁等を開弁させる。
【００２７】
また、制御油源から切替弁１７のポートＹに供給された制御油Ｈ０は、ストッパ部２５に押圧力を与えて支持する。
【００２８】
一方、制御油源からオリフィス２６で減圧され、切替弁１７のポートＸに供給された制御油Ｈ０は、ピストン２７に押圧力を与えて図示の位置に移動させ、ピストン２７をストッパ部２５に対し、ロックさせる。このとき、遮断弁１６のポートＡＰと切替弁１７のポートＡＰとをオリフィス２８を介して接続していた油路への圧力油の給排が断たれる。
【００２９】
他方、第１電磁弁１９ａおよび第２電磁弁１９ｂのそれぞれは、ともに、指令部からの信号で作動するスプール駆動部２１ａ，２１ｂの駆動力によりスプール２０ａ，２０ｂを図示の位置から右側に移動させ、ポートＡ，Ａを閉鎖させる。このため、制御油源からオリフィス２６で減圧された制御油Ｈ０の第１電磁弁１９ａへの供給と、遮断弁１６のポートＡから排出され、オリフィス２９で減圧された非常油Ｅ０の第２電磁弁１９ｂへの供給とは、ともに断たれる。
【００３０】
また、制御油源からオリフィス２６で減圧され、ポペットタイプのトリップ弁１８のポートＡＰに供給された制御油Ｈ０は、バネ２３ｂの弾性力に打ち勝って弁体２４ｂを図示の位置に移動させ、ポートＡとポートＢとを閉鎖させ、遮断弁１６のポートＡからトリップ弁１８のポートＡへの非常油Ｅ０の供給を断つ。
【００３１】
運転中、例えば、負荷遮断等の信号が指令部から第１電磁弁１９ａおよび第２電磁弁１９ｂのうち、少なくとも一方に伝達された場合、スプール駆動部２１ａ，２１ｂは、スプール２０ａ，２０ｂをリミットスイッチ２２ａ，２２ｂ側に移動させ、ポートＡ，ＡをポートＴ，Ｔに連通させ、オリフィス２６で減圧させた制御油Ｈ０とオリフィス２９で減圧させた非常油Ｅ０とを合流させ、ドレンとして例えば制御油源に戻している。このため、オリフィス２６からトリップ弁１８の弁体２４ｂに供給していた制御油Ｈ０の圧力が低下するので、トリップ弁１８は、弁体２４ｂを図示の位置から移動させ、ポートＡとポートＢとを連通させる。すると、今迄、遮断弁１６のポートＡから弁駆動部に供給していた非常油Ｅ０は、トリップ弁１８のポートＡとポートＢとの連通によりドレンとして制御油源等に戻され、その圧力を低下させる。このとき、オリフィス２６から切替弁１７のポートＸに供給していた制御油Ｈ０の圧力も下がり、切替弁１７のピストン２７が図示の位置から下方に移動し、これと同時に切替弁１７のポートＹとポートＡＰとが連通する。
【００３２】
ポートＹとポートＡＰとが連通すると、制御油源から切替弁１７のポートＹに供給されていた制御油Ｈ０は、ポートＡＰ、オリフィス２８を介して遮断弁１６のポートＡＰに供給され、弁体２４ａに押圧力を与えてポートＢとポートＡとを閉鎖させ、燃料弁等を閉鎖させる。
【００３３】
なお、非常用制御装置は、トリップ時等の不測の事態に備えて通常運転中でも遮断弁１６、切替弁１７、トリップ弁１８に何ら影響を与えないで第１電磁弁１９ａ、第２電磁弁１９ｂのうち、いずれか一方のスプール２０ａ，２０ｂの作動確認テストを行っているが、その作動をリミットスイッチ２２ａ，２２ｂで確認している。この場合、例えば第２電磁弁１９ｂから第１電磁弁１９ａにテストが移行するとき、第２圧力油供給系３１から第１電磁弁１９ａに背圧が与えられ、第１電磁弁１９ａの誤動作を防止している。
このように、非常用制御装置は、遮断弁の出口側からバイパスし、オリフィスを備えた第２圧力油供給系を第１電磁弁と第２電磁弁とを接続する第１圧力油供給系に接続し、第２電磁弁のテスト終了後、第１電磁弁へのテスト移行の際、減圧後の圧力油を第１電磁弁に背圧として与えて第１電磁弁の誤動作を防止したので、第１電磁弁のテストを確実に実施することができる。
【００３４】
【発明の効果】
以上の説明のとおり、本発明に係る非常用制御装置は、コンバインドサイクル発電プラントに適用される燃料弁や蒸気タービンプラントに適用される蒸気弁等の急速閉鎖に際し、制御油を給排させる遮断弁と非常油を給排させるトリップ弁を簡易な構造としたので、緊急時の燃料弁等の急速閉鎖に対し、充分に対処することができる。
【図面の簡単な説明】
【図１】本発明に係る非常用制御装置を示す概略系統図。
【図２】従来の非常用制御装置を示す概略図。
【符号の説明】
１ マスタートリップ弁
２ 第１電磁弁
３ 第２電磁弁
４，７，９ スプール
５ オリフィス
６ 第１通路
８ 第２通路
１０ 第３通路
１１ バネ
１２ 通路
１３，１４ リミットスイッチ
１５ 摺動面
１６ 遮断弁
１７ 切替弁
１８ トリップ弁
１９ａ 第１電磁弁
１９ｂ 第２電磁弁
２０ａ，２０ｂ スプール
２１ａ，２１ｂ スプール駆動部
２２ａ，２２ｂ リミットスイッチ
２３ａ，２３ｂ バネ
２４ａ，２４ｂ 弁体
２５ ストッパ部
２６，２８，２９ オリフィス
２７ ピストン
３０ 第１圧力油供給系
３１ 第２圧力油供給系[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an emergency control device that quickly closes a fuel valve applied to a combined cycle power plant or a steam valve applied to a steam turbine plant in an emergency.
[0002]
[Prior art]
The emergency control system uses the control oil (high pressure oil) supplied from the control oil supply source as emergency oil for the fuel valves and steam valves applied to combined cycle power plants and steam turbine plants. When the fuel valve or steam valve needs to be quickly closed, the emergency oil is discharged as a drain and the pressure oil is instantly reduced to quickly close each valve. It is what you have.
[0003]
As shown in FIG. 2, the emergency control device is configured by combining a master trip valve 1 with a first electromagnetic valve 2 and a second electromagnetic valve 3.
[0004]
The master trip valve 1 is supplied with control oil from the control oil supply source to each of the ports X and P during normal operation.
[0005]
The control oil supplied to the port P is supplied as emergency oil to the drive valve that opens and closes the fuel valve and the steam valve via the spool 4 and the port B.
[0006]
The control oil supplied to the port X is depressurized by the orifice 5, and then a part of the control oil is supplied to the spool 4 via the first passage 6 to maintain the spool 4 at the position shown in the figure, and the rest The first electromagnetic valve 2 is supplied, the spool 7 of the first electromagnetic valve 2 is maintained at the illustrated position, and the first electromagnetic valve 2 is closed. The first passage 6 communicates with the third passage 10 via the spool 7 of the first electromagnetic valve 2, the second passage 8, and the spool 9 of the second electromagnetic valve 3.
[0007]
In the emergency control device having such a configuration, when an emergency situation such as a turbine trip occurs, the first solenoid valve 2 and the second solenoid valve 3 both set the spools 7 and 9 by the emergency command signal from the command unit. The first passage 6 is communicated with the third passage 10 through the second passage 8 by moving in the right direction from the illustrated position. At this time, the control oil supplied to the port X flows from the first passage 6 to the third passage 10 via the second passage 8 and is discharged from there.
[0008]
When the control oil is discharged from the third passage 10 as drain, the pressure oil in the first passage 6 decreases. At this time, the spool 4 is moved from the position shown in the drawing to the position of the broken line on the left side by the elastic force of the spring 11, and the port B which is the outlet of the emergency oil is communicated with the port T through the passage 12 of the spool 4. The pressure oil in 4 is drained to reduce the pressure of the emergency oil. At this time, since the port P and the port A communicate with each other at the same time, the flow of control oil from the control oil supply source is cut off.
[0009]
In this way, the conventional emergency control device cuts off the control oil supplied from the control oil supply source to the master trip valve 1 in the event of an emergency, and drains the emergency oil in the master trip valve 1 as a drain, so that the fuel valve or steam The supply of pressure oil to the drive valve that opens and closes the valve was cut off, and the fuel valve and the like were quickly closed to prevent runaway accidents such as overspeed of the gas turbine and steam turbine.
[0010]
Note that both the first solenoid valve 2 and the second solenoid valve 3 are provided with limit switches 13 and 14 so that the test of whether the spools 7 and 9 operate reliably in an emergency is irrelevant to the spool of the master trip valve 1. The operation of the spools 7 and 9 at that time is confirmed by the limit switches 13 and 14.
[0011]
[Problems to be solved by the invention]
The conventional emergency control device shown in FIG. 2 has a gap between the spool 4 and the sliding surface 15 of the master trip valve 1 because it is necessary to supply and discharge emergency oil. The spool 4 may become clogged and malfunction. In order to prevent the malfunction of the spool 4, it is conceivable to increase the clearance of the sliding surface 15. However, the increase in the clearance leads to an increase in pressure oil leakage, which only increases the burden on the pressure oil supply source. It is useless energy consumption.
[0012]
Further, when the first solenoid valve 2 is tested, the control oil leaks from the sliding surface 15 of the spool 4 while the control oil supplied from the first passage 6 to the second passage 8 of the master trip valve 1 is filled. As a result, the pressure of the control oil supplied to the first passage 6 is lowered, and the emergency control device may cause the spool 4 to be erroneously operated.
[0013]
The present invention has been made in consideration of such circumstances, and the master trip valve is replaced by a combination of a plurality of poppet valves, and the sliding surface is further reduced to ensure valve malfunction in emergency and testing. It is an object of the present invention to provide an emergency control device that prevents this.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, an emergency control device according to the present invention uses at least one of a fuel valve and a steam valve as control oil from a control oil source as emergency oil. A shut-off valve that is supplied to the valve to open, a trip valve that reduces the pressure of the emergency oil that was supplied from the shut-off valve to at least one of the fuel valve and the steam valve in an emergency, and the shut-off valve The first pressure oil supply system that directly connects a plurality of solenoid valves for draining the control oil from the control oil source, and a switching valve that shuts off the control oil supply from the control oil source A second pressure oil supply system that is connected to an intermediate portion of the first pressure oil supply system and bypasses from the outlet side of the shutoff valve.
[0015]
Further, in order to achieve the above object, the emergency control device according to the present invention provides a pressure oil in which an orifice is provided in the second pressure oil supply system and the electromagnetic valve before the test is decompressed as described in claim 2. Is given as back pressure.
[0016]
Moreover, in order to achieve the said objective, the emergency control apparatus which concerns on this invention forms the shut-off valve in the poppet type which combined the spring and the valve body as described in Claim 3.
[0017]
Moreover, in order to achieve the said objective, the emergency control apparatus which concerns on this invention forms the trip valve in the poppet type which combined the spring and the valve body, as described in Claim 4.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of an emergency control device according to the present invention will be described with reference to the drawings and reference numerals attached to the drawings.
[0019]
FIG. 1 is a schematic system diagram showing an embodiment of an emergency control device according to the present invention.
[0020]
The emergency control device according to the present invention includes a poppet type shut-off valve 16 that is operated by control oil supplied from a control oil source, and a switching valve 17 that drives the shut-off valve 16 with pressure oil during a trip such as a load shut-off. It has a configuration with.
[0021]
Further, the emergency control device according to the present invention lowers the pressure of the emergency oil supplied from the shutoff valve 16 to the fuel valve or the steam valve or the like (both not shown) during the trip, and closes the fuel valve or the like. A type of trip valve 18 is sequentially connected in series to a first electromagnetic valve 19 a and a second electromagnetic valve 19 b via a first pressure oil supply system 30.
[0022]
Each of the first solenoid valve 19a and the second solenoid valve 19b confirms whether or not the spool driving portions 21a and 21b that operate the spools 20a and 20b and the spools 20a and 20b to be tested during normal operation are operated. Limit switches 22a and 22b are provided.
[0023]
Further, the first pressure oil supply system 30 for connecting the first solenoid valve 19a and the second solenoid valve 19b to each other is bypassed from the outlet side of the port A of the shutoff valve 16 and the second pressure oil provided with the orifice 29. A supply system 31 is provided. When the second pressure oil supply system 31 performs a test operation of a first solenoid valve 19a and a second solenoid valve 19b, which will be described later, for example, after the test of the second solenoid valve 19b is completed, the second pressure oil supply system 31 moves to the first solenoid valve 19a. The pressure oil decompressed by the orifice 29 is applied as a back pressure to the first electromagnetic valve 19a in advance to prevent the first electromagnetic valve 19a from causing air accumulation and prevent malfunction. In the test, either the first solenoid valve 19a or the second solenoid valve 19b may be performed first, but each of the shut-off valve 16, the switching valve 17, and the trip valve 18 is not adversely affected. It carries out for every solenoid valve 19a, 19b.
[0024]
Each of the poppet type shut-off valve 16 and trip valve 18 accommodates valve bodies 24a and 24b supported by springs 23a and 23b, and operates the valve bodies 24a and 24b depending on the level of supplied pressure oil. It has a simple configuration.
[0025]
In the emergency control device having such a configuration, the control oil H0 supplied from the control oil source during start-up operation can be summarized into three systems.
[0026]
First, the control oil H0 supplied to the port B of the poppet type shut-off valve 16 overcomes the elastic force of the spring 23a and moves the valve body 24 to the right side from the illustrated position so that the port B and the port A communicate with each other. Then, the emergency oil E0 is supplied to a valve drive unit (not shown) such as a fuel valve to open the fuel valve or the like.
[0027]
Further, the control oil H0 supplied from the control oil source to the port Y of the switching valve 17 applies a pressing force to the stopper portion 25 and supports it.
[0028]
On the other hand, the control oil H0 depressurized by the orifice 26 from the control oil source and supplied to the port X of the switching valve 17 applies a pressing force to the piston 27 to move it to the position shown in the figure, and moves the piston 27 against the stopper portion 25. Let me lock. At this time, the supply and discharge of the pressure oil to the oil passage connecting the port AP of the shut-off valve 16 and the port AP of the switching valve 17 via the orifice 28 is cut off.
[0029]
On the other hand, each of the first solenoid valve 19a and the second solenoid valve 19b moves the spools 20a, 20b from the illustrated position to the right side by the driving force of the spool drive parts 21a, 21b that are operated by a signal from the command unit. Ports A and A are closed. For this reason, supply of the control oil H0 depressurized by the orifice 26 from the control oil source to the first electromagnetic valve 19a, and the second electromagnetic of the emergency oil E0 discharged from the port A of the shutoff valve 16 and depressurized by the orifice 29 Both the supply to the valve 19b is cut off.
[0030]
Further, the control oil H0 decompressed by the orifice 26 from the control oil source and supplied to the port AP of the poppet type trip valve 18 overcomes the elastic force of the spring 23b and moves the valve body 24b to the position shown in the figure. A and port B are closed, and the supply of emergency oil E0 from port A of the shutoff valve 16 to port A of the trip valve 18 is cut off.
[0031]
During operation, for example, when a signal such as a load cutoff is transmitted from the command unit to at least one of the first electromagnetic valve 19a and the second electromagnetic valve 19b, the spool driving units 21a and 21b limit the spools 20a and 20b. Move to the switch 22a, 22b side, connect ports A and A to ports T and T, and merge the control oil H0 depressurized by the orifice 26 and the emergency oil E0 depressurized by the orifice 29, and control as a drain, for example Return to oil source. For this reason, since the pressure of the control oil H0 supplied from the orifice 26 to the valve body 24b of the trip valve 18 is reduced, the trip valve 18 moves the valve body 24b from the position shown in FIG. To communicate. Then, the emergency oil E0 that has been supplied from the port A of the shut-off valve 16 to the valve drive until now is returned to the control oil source and the like as a drain by the communication between the port A and the port B of the trip valve 18, and the pressure Reduce. At this time, the pressure of the control oil H0 supplied from the orifice 26 to the port X of the switching valve 17 also decreases, and the piston 27 of the switching valve 17 moves downward from the position shown in the figure. At the same time, the port Y of the switching valve 17 And port AP communicate.
[0032]
When the port Y communicates with the port AP, the control oil H0 supplied from the control oil source to the port Y of the switching valve 17 is supplied to the port AP of the shutoff valve 16 through the port AP and the orifice 28, and the valve body A pressing force is applied to 24a to close port B and port A, and the fuel valve and the like are closed.
[0033]
Note that the emergency control device does not affect the shutoff valve 16, the switching valve 17, and the trip valve 18 even during normal operation in preparation for an unexpected situation such as a trip, and the first solenoid valve 19a and the second solenoid valve 19b. Among them, the operation confirmation test of one of the spools 20a and 20b is performed, and the operation is confirmed by the limit switches 22a and 22b. In this case, for example, when the test shifts from the second electromagnetic valve 19b to the first electromagnetic valve 19a, back pressure is applied from the second pressure oil supply system 31 to the first electromagnetic valve 19a, and malfunction of the first electromagnetic valve 19a is caused. It is preventing.
Thus, the emergency control device bypasses from the outlet side of the shut-off valve and replaces the second pressure oil supply system having the orifice with the first pressure oil supply system that connects the first solenoid valve and the second solenoid valve. After connecting the test of the second solenoid valve, when the test shifts to the first solenoid valve, the pressure oil after decompression was applied as a back pressure to the first solenoid valve to prevent malfunction of the first solenoid valve. The first solenoid valve can be reliably tested.
[0034]
【The invention's effect】
As described above, the emergency control device according to the present invention is a shut-off valve that supplies and discharges control oil when a fuel valve applied to a combined cycle power plant or a steam valve applied to a steam turbine plant is rapidly closed. Since the trip valve for supplying and discharging emergency oil has a simple structure, it is possible to sufficiently cope with rapid closing of a fuel valve or the like in an emergency.
[Brief description of the drawings]
FIG. 1 is a schematic system diagram showing an emergency control device according to the present invention.
FIG. 2 is a schematic view showing a conventional emergency control device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Master trip valve 2 1st solenoid valve 3 2nd solenoid valves 4, 7, 9 Spool 5 Orifice 6 1st passage 8 2nd passage 10 3rd passage 11 Spring 12 Passage 13 and 14 Limit switch 15 Sliding surface 16 Shut-off valve 17 Switching valve 18 Trip valve 19a 1st solenoid valve 19b 2nd solenoid valve 20a, 20b Spool 21a, 21b Spool drive part 22a, 22b Limit switch 23a, 23b Spring 24a, 24b Valve body 25 Stopper part 26, 28, 29 Orifice 27 Piston 30 First pressure oil supply system 31 Second pressure oil supply system

Claims (4)

制御油源からの制御油を非常油として燃料弁および蒸気弁のうち、少なくともいずれか一方に供給して開弁させる遮断弁と、非常時、上記遮断弁から上記燃料弁および蒸気弁うち、少なくともいずれか一方に供給していた非常油の圧力を低下させるトリップ弁と、上記遮断弁を閉弁させて上記制御油源からの制御油の供給を断つ切替弁と、上記制御油源からの制御油をドレン化する複数の電磁弁を直接接続させる第１圧力油供給系と、この第１圧力油供給系の中間部分に接続され、上記遮断弁の出口側からバイパスする第２圧力油供給系とを備えたことを特徴とする非常用制御装置。A cutoff valve that supplies control oil from the control oil source as emergency oil to at least one of the fuel valve and the steam valve and opens the valve; and in an emergency, at least the fuel valve and the steam valve from the cutoff valve A trip valve that reduces the pressure of the emergency oil supplied to either one, a switching valve that closes the shut-off valve to cut off the supply of control oil from the control oil source, and a control from the control oil source A first pressure oil supply system that directly connects a plurality of solenoid valves for draining oil, and a second pressure oil supply system that is connected to an intermediate portion of the first pressure oil supply system and bypasses from the outlet side of the shutoff valve And an emergency control device. 第２圧力油供給系にオリフィスを設け、テスト前の電磁弁に減圧した圧力油を背圧として与えることを特徴とする請求項１記載の非常用制御装置。The emergency control device according to claim 1, wherein an orifice is provided in the second pressure oil supply system, and the decompressed pressure oil is applied as a back pressure to the electromagnetic valve before the test. 遮断弁は、バネと弁体とを組み合せたポペットタイプに形成したことを特徴とする請求項１記載の非常用制御装置。2. The emergency control device according to claim 1, wherein the shut-off valve is formed in a poppet type in which a spring and a valve body are combined. トリップ弁は、バネと弁体とを組み合せたポペットタイプに形成したことを特徴とする請求項１記載の非常用制御装置。The emergency control device according to claim 1, wherein the trip valve is formed in a poppet type in which a spring and a valve body are combined.
JP23085799A 1999-08-17 1999-08-17 Emergency control device Expired - Fee Related JP3777273B2 (en)

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JP5941388B2 (en) * 2012-10-02 2016-06-29 株式会社東芝 Emergency control device and master trip valve
EP3351745A4 (en) * 2015-12-17 2018-12-05 Mitsubishi Heavy Industries Compressor Corporation Emergency shut-off device
WO2017104036A1 (en) * 2015-12-17 2017-06-22 三菱重工コンプレッサ株式会社 Trip system for steam turbine
JP7297617B2 (en) * 2019-09-13 2023-06-26 日本ムーグ株式会社 Electro-hydraulic actuator system, hydraulic circuit for electro-hydraulic actuator system, and steam turbine system including the same

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