JP3836604B2 - Gas turbine fuel gas decompression and heating system - Google Patents
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Description
【０００１】
【発明の属する技術分野】
本発明はガスタービン燃料ガス減圧加温装置の改良に係わり、特に加熱器にバイパス管路および流量調整弁を備え、この流量調整弁の制御により燃料ガス温度を制御するようにしたガスタービン燃料ガス減圧加温装置に関するものである。
【０００２】
【従来の技術】
従来一般に採用されているこの種の燃料ガス加温装置は、都市ガス供給用の燃料系統に設置されるものが多く、ガス流量の増減の少ない運用で安定した制御性が得られる温水加温方式や蒸気加温方式では加熱器ドレンレベル可変制御などが採用されている。
【０００３】
また、加熱器をバイパスするバイパス管路を設置し、この管路上に減圧装置出口の燃料ガス温度を制御する温度調節弁を設置するようにしたものも知られている。なお、この種の燃料ガス減圧加温装置に関連するものとしては、例えば特開平９−２３６０２５号公報あるいは特開平６−１０２９０３号公報などが挙げられる。
【０００４】
【発明が解決しようとする課題】
このように形成されている燃料ガス減圧加温装置では、都市ガスの燃料ガス系統に採用する場合には特に問題になることはないのであるが、しかしガスタービンなどにこの燃料ガス減圧加温装置を適用する際には次のような項目の考慮が必要となる。すなわち、（１）大巾な燃料流量の変化があること、（２）ガスタービン必要燃料ガス圧力範囲内で燃料ガスを供給する必要があること、（３）ガスタービン必要燃料ガス温度範囲内で燃料ガスを供給する必要があること、すなわち、都市ガス供給用の燃料ガス系統より大幅に厳しい燃料供給条件を満足する燃料ガス減圧加温装置が必要となるということである。
【０００５】
ガスタービンは発電設備に採用されることが多いため、ガスタービン起動に始まり、点火、昇速、並列、負荷上昇を行い、起動完了後は定められた負荷運用パターンに従い負荷変化を行い、夜間等の電力供給停止時には、定格負荷から負荷降下を行い、解列、消火を経てガスタービン停止となる。
【０００６】
このようなガスタービン運用に対して点火時、乾式低ＮＯｘ燃焼器採用の場合の燃焼器切替え時には、燃料ガス温度の変化幅をできるだけ小さくする必要がある。それは、燃料ガス温度が高いと燃料ガス比重の減少に伴い燃料ガス流量が減少し、燃空比が小さくなり火炎喪失範囲に近づくこと、また逆に燃料ガス温度が高いと上記と逆の理由で逆火範囲に近づくためである。
【０００７】
また、発電負荷の急激な減少に対応したＦＣＢ運転やガスタービン設備の保護を目的としたランバック運転では、燃料ガス流量が急減するので、燃料ガス温度の上昇による火炎喪失を防止する必要がある。
【０００８】
従来の加熱器ドレンレベル可変制御では、熱量増加操作はドレンレベル調節弁を開することによりドレンレベルは速やかに降下することから追従できるが、熱量減少操作においてはドレンレベル調節弁は閉するものの加熱媒体が凝縮してドレン化するのには時間を要することから燃料ガス流量急減時にはガスタービン供給温度が上昇し、加熱器器内圧力の飽和温度相当まで上昇する。
【０００９】
加熱器器内圧力は、ガスタービン燃料ガス供給系統最高使用温度の飽和蒸気圧力相当に設定されることが一般的であるので、燃料ガス温度は、瞬時に常温から１００℃以上に急変することになり、ガスタービン火炎喪失の可能性は増大する恐れがある。
【００１０】
また、加熱器をバイパスする管路およびこの管路上に減圧装置出口の燃料ガス温度を制御する温度調節弁（流量調節弁）を設置した場合においては、温度調節弁が制御状態である時、すなわち燃料ガスの加温が必要な場合には、燃料に与える熱量が増加した時あるいは燃料急減時でも減圧装置出口の燃料ガス温度上昇を捕らえて温度調節弁は開方向に動作してバイパス側へ流れる燃料ガス流量を増加させることにより燃料ガス温度上昇を抑制できるが、温度調節弁が全開状態となってしまった場合には燃料ガス温度は制御不能となり減圧装置出口の燃料ガス温度は変動することが予想される。
【００１１】
これを回避するためには、減圧装置出口燃料ガス温度目標設定値を高く設定してあらゆる設計条件において温度調節弁が中間開度で運用することが必要となり、設備規模の増大、配管・機器材質の強化、補助蒸気などの加熱媒体使用量の増加が考えられる。
【００１２】
本発明は、ガスタービンの燃料ガス減圧加温運転をする場合、燃料ガス基地から供給される燃料ガスの圧力・温度の変動およびガスタービン燃料消費量の変動による必要加熱量の変動に対しても、設備規模の増大、配管・機器材質の強化、補助蒸気などの加熱媒体使用量の増加を抑えガスタービン供給燃料ガスを適正な温度で供給することが可能なこの種のガスタービン燃料ガス減圧加温装置を提供することにある。
【００１３】
【課題を解決するための手段】
すなわち本発明は、ガスタービン燃料ガス供給系に配置され、燃料ガスを加温する加熱器と、この加熱器を通過する燃料ガスの一部をバイパスさせるバイパス管路と、このバイパス管路上に設けられた流量調整弁と、前記加熱器の下流側に配置され、前記加熱器にて加温されたガスを減圧する減圧装置とを備え、前記流量調整弁の制御により、前記減圧装置出口の燃料ガス温度を制御するようにしたガスタービン燃料ガス減圧加温装置において、前記加熱器の加熱媒体供給系に、加熱媒体の流量を遮断する加熱媒体遮断弁あるいは調節弁を設け、かつガスタービンに供給される燃料ガスを加熱する必要が無い場合には、前記加熱媒体遮断弁により加熱器に供給される加熱媒体を遮断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。
【００１４】
またこの場合、前記遮断弁あるいは調節弁を、前記減圧装置出口の燃料ガス温度の上昇が生じた時に遮断動作するように形成したものである。例えば、負荷遮断、ランバックなど、減圧装置出口の燃料ガス温度の上昇を引き起こす事象の発生信号をとらえて遮断動作するように形成する。また、前記遮断弁などを、前記減圧装置出口の燃料ガス温度が規定値以上で遮断動作するように形成したものである。
【００１５】
また本発明は、ガスタービン燃料ガス供給系に配置され、燃料ガスを加温する加熱器と、この加熱器を通過する燃料ガスの一部をバイパスさせるバイパス管路と、このバイパス管路上に設けられた流量調整弁と、前記加熱器の下流側に配置され、前記加熱器にて加温されたガスを減圧する減圧装置とを備え、前記流量調整弁の制御により、前記減圧装置出口の燃料ガス温度を制御するようにしたガスタービン燃料ガス減圧加温装置において、前記加熱器の加熱媒体供給系に、加熱媒体の流量を遮断する加熱媒体遮断弁を設けるとともに、この加熱媒体遮断弁を前記加熱器内圧力で制御するようになし、かつガスタービンに供給される燃料ガスを加熱する必要が無い場合には、前記加熱器内圧力制御目標設定値を下げることにより、前記加熱媒体を遮断するようにしたものである。あるいは、前記遮断弁に代えて加熱媒体供給源から加熱器までの管路上に加熱器器内圧力を制御する圧力調整弁を設け、ガスタービンに供給される燃料ガスを加熱しない場合には、加熱器内圧力制御目標設定値を下げて、前記加熱媒体を遮断するようにしたものである。
【００１６】
また本発明は、ガスタービン燃料ガス供給系に配置され、燃料ガスを加温する加熱器と、この加熱器を通過する燃料ガスの一部をバイパスさせるバイパス管路と、このバイパス管路上に設けられた流量調整弁と、前記加熱器の下流側に配置され、前記加熱器にて加温されたガスを減圧する減圧装置とを備え、前記流量調整弁の制御により、前記減圧装置出口の燃料ガス温度を制御するようにしたガスタービン燃料ガス減圧加温装置において、前記加熱器と加熱器バイパスの分岐から合流までの加熱器側管路上に遮断弁を設けるとともに、ガスタービンに供給される燃料ガスを加熱する必要が無い場合には、前記遮断弁を遮断し、燃料ガスを全量加熱器バイパス側に流すようにしたものである。
【００１７】
またこの場合、前記遮断弁あるいは調整弁を、減圧装置出口の燃料ガス温度の上昇が起きる時に動作するように形成したものである。例えば負荷遮断、ランバックなど減圧装置出口の燃料ガス温度の上昇を引き起こす事象の発生信号をとらえて動作するように形成する。また、前記遮断弁を、減圧装置出口の燃料ガス温度が規定値以上で遮断動作するように形成したものである。
【００１８】
また、ガスタービン燃料ガス供給系に配置され、燃料ガスを加温する加熱器と、この加熱器を通過する燃料ガスの一部をバイパスさせるバイパス管路と、このバイパス管路上に設けられた流量調整弁と、前記加熱器の下流側に配置され、前記加熱器にて加温されたガスを減圧する減圧装置とを備え、前記流量調整弁の制御により、前記減圧装置出口の燃料ガス温度を制御するようにしたガスタービン燃料ガス減圧加温装置において、前記流量調整弁の制御を、前記減圧装置の上流側の燃料ガス温度で制御するようにしたものである。
【００１９】
また、ガスタービン燃料ガス供給系に配置され、燃料ガスを加温する加熱器と、この加熱器を通過する燃料ガスの一部をバイパスさせるバイパス管路と、このバイパス管路上に設けられた流量調整弁と、前記加熱器の下流側に配置され、前記加熱器にて加温されたガスを減圧する減圧装置とを備え、前記流量調整弁の制御により、前記減圧装置出口の燃料ガス温度を制御するようにしたガスタービン燃料ガス減圧加温装置において、前記流量調整弁の制御を、前記減圧装置の上流側の燃料ガス温度および圧力で制御するようにしたものである。
【００２０】
すなわちこのように形成されたガスタービン燃料ガス減圧加温装置であると、ガスタービンの各運転状態におけるガスタービン必要加熱量変動の追従性が向上し、また、燃料ガスを加熱する必要がない場合には加熱量を遮断することが可能であり、設備規模の増大や配管・機器材質の強化、また補助蒸気などの加熱媒体使用量を増加させることなく燃料ガスを適正な温度で供給することが可能となるのである。
【００２１】
【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にはそのガスタービン燃料ガス減圧加温装置の系統が線図で示されている。本実施例の系統構成は、燃料ガス基地から供給されたガスタービン燃料ガスを加温する加熱器１、加温後の燃料ガスを減圧する減圧弁（減圧装置）２、並びに加熱器１を通過する燃料ガスの一部をバイパスする管路（バイパス管路）３、同管路上に減圧装置出口の燃料ガス温度を制御する温度調節弁（流量調整弁）５、および加熱媒体供給源から加熱器までの管路上に遮断弁７が設置され構成されている。
【００２２】
ここで、減圧加温装置に供給される燃料ガスの圧力および温度は、他の発電プラントの運転状態や季節により変動し、また、当該ガスタービン消費燃料ガス流量は運転状態により変動する。加熱器における燃料ガス必要加熱量は次式で表わされる。
【００２３】
【数１】
Ｑ＝Ｇ×（Ｔo×Ｃpo− Ｔi×Ｃpi） …（１）
ここで、
Ｑ：燃料ガス必要加熱量、Ｇ：燃料ガス消費流量、
Ｔo：加熱器出口燃料ガス温度、Ｃpo：加熱器出口燃料ガス比熱、
Ｔi：加熱器入口燃料ガス温度、Ｃpi：加熱器入口燃料ガス比熱、
である。なお、Ｔoは減圧後の目標温度に供給圧力からガスタービン要求圧力まで減圧した時の温度降下量を加算した値となる。
【００２４】
これより、燃料ガス必要加熱量は供給燃料ガスの圧力、温度、流量の変動により変化する。ガスタービン必要燃料ガス温度は一般に図２で示されるように、必要最低燃料ガス温度から、ガスタービン許容最高燃料ガス温度の範囲で燃料ガスを供給する必要がある。ガスタービン必要最低燃料ガス温度は、ガスタービン供給燃料ガス圧力の露点温度等から決まり、ガスタービン許容最高燃料ガス温度は、燃料ガス系統に使用する弁の材質上の許容温度等から決まり、既設ガスタービンの燃料ガス系統の改造の場合には、既設設備の最高使用温度となる場合もある。
【００２５】
また、ガスタービン運転中において、ガスタービン供給燃料ガスは、図３に示されているようにガスタービン許容変化幅以内で供給する必要もある。ガスタービンランバック等の大幅な負荷降下時には燃料ガス消費量が急減することにより、燃料ガス必要加熱量が急減し、この急減に追従できない場合は燃料ガス必要加熱量に対して実加熱量が大きくなることから、ガスタービン供給燃料ガス温度が急上昇し、ガスタービン燃焼安定性が低下するため、ガスタービン燃料流量の変動に対する燃料ガス必要加熱量の変動に十分追従できるシステム構成および制御方式が必要となる。
【００２６】
本実施例では、通常運転中は、加熱器バイパス系統に設置した温度調節弁５により減圧装置出口の燃料ガス温度を制御する。しかし、温度調節弁５が全開した場合でも加熱器側にも燃料ガスは流れることから、加熱の必要が無い場合でも一部の燃料ガスは加熱をすることになり、この状態で減圧装置出口の燃料ガス温度が上昇した場合には温度を下げる手段が無く、ガスタービン許容燃料ガス温度上昇幅を超えてしまう恐れがある。
【００２７】
そこで、加熱媒体供給源から加熱器までの管路上に設置した遮断弁７は、図４に示されているように減圧弁出口の燃料ガス温度がガスタービン供給燃料ガス温度目標設定値からガスタービン許容燃料ガス温度上昇幅の間に設定した加熱遮断温度設定値以上となったときに動作させることで、加熱器供給熱源を遮断し燃料ガスの加熱を停止する。本実施例によれば、制御対象である減圧弁出口の燃料ガス温度により制御目標値に対し的確に制御が可能となる。
【００２８】
また、ガスタービン負荷遮断、ランバック等の燃料流量急減時において、燃料ガス温度の変化は、燃料ガス流量の変化に対して大きな時間遅れがある。したがって、燃料流量急減時には減圧弁出口の燃料ガス温度の上昇で遮断弁を動作させると遅れてさらに上昇し、ガスタービン許容燃料ガス温度上昇幅を越える可能性がある。そこで、負荷遮断等の事象発生信号、出力信号、燃料ガス流量信号等により先行的に遮断弁を動作させることで燃料ガス流量急減時にも、ガスタービン供給燃料ガス温度をガスタービン許容燃料ガス温度上昇幅内に抑えることができる。
【００２９】
なお、図５に示されているようにガスタービン供給燃料ガス温度目標設定値を下げて積極的に燃料ガスの加熱を停止する運転を行うことで、燃料ガス加熱量が低減されプラントトータル効率の向上が図れる。
【００３０】
次にもう一つの実施例を説明する。本実施例の系統構成を図６に示す。なお、前述した実施例と同一符号は同一物を示しており、ここではその詳細説明は省略する。本実施例では、加熱媒体供給源から加熱器までの管路上に設置した加熱器器内圧力を調節する圧力調節弁を設置し、通常運転中は圧力調節弁により加熱器器内圧力を一定に制御するが、ガスタービン負荷遮断、ランバック等の燃料流量急減時に圧力設定値を下げることで、加熱媒体供給源を遮断し燃料ガスの過熱を停止する。
【００３１】
本実施例によれば、ガスタービン負荷遮断、ランバック等の燃料ガス流量急減時に加熱器器内圧力設定値を下げることで遮断弁を使用することなく燃料ガスの加温を停止することが可能となり、ガスタービン供給燃料ガス温度をガスタービン許容燃料ガス温度上昇幅内に抑えることができる。
【００３２】
次にもう一つの実施例を説明する。本実施例の系統構成を図７に示す。なお、前述した実施例と同一符号は同一物を示しており、ここではその詳細説明は省略する。本実施例では、燃料ガス系統の加熱器側と加熱器バイパス側の分岐から合流までの加熱器側管路上に遮断弁１０を設置し、設置した遮断弁を、減圧弁出口の燃料ガス温度が、ガスタービン供給燃料ガス温度目標設定値からガスタービン許容燃料ガス温度上昇幅の間に設定した加熱遮断温度設定値以上となったときに動作させることで燃料ガスを全量加熱器バイパス側に流すことで燃料ガスの加熱を停止する。加熱器加熱媒体供給系統は通常運転状態を継続する。
【００３３】
本実施例によれば、制御対象である減圧弁出口の燃料ガス温度により制御目標値に対し的確に制御が可能となる。また、再び燃料ガスの加温が必要になったときには遮断弁を開して加熱器に燃料ガスを流すことで即対応することができる。
【００３４】
また、ガスタービン負荷遮断、ランバック等の燃料流量急減時において、燃料ガス温度の変化は、燃料ガス流量の変化に対して大きな時間遅れがある。したがって、燃料流量急減時には減圧弁出口の燃料ガス温度の上昇で遮断弁を動作させると減圧弁出口の燃料ガス温度は遅れてさらに上昇し、ガスタービン許容燃料ガス温度上昇幅を越える可能性がある。そこで、負荷遮断等の事象発生信号、出力信号、燃料ガス流量信号等により先行的に遮断弁を動作させることで燃料ガス流量急減時にも、ガスタービン供給燃料ガス温度をガスタービン許容燃料ガス温度上昇幅内に抑えることができる。
【００３５】
なお、ガスタービン供給燃料ガス温度目標設定値を下げて積極的に燃料ガスの加熱を停止する運転を行うことで、燃料ガス加熱量が低減されプラントトータル効率の向上が図れる。また、図１０に示すように加熱器側と加熱器バイパス側の分岐点あるいは合流点に三方弁を設置することで加熱器バイパス側に設置した温度調節弁５と加熱器側に設置した遮断弁１０の機能を１弁で実施することができる。
【００３６】
起動時にはガスタービン点火前に減圧加温装置を起動しておく必要があるが、ガスタービン点火前にはガスタービン燃料ガス消費が無いため、減圧弁下流側の燃料ガス圧力がガスタービン要求圧力となった時点で減圧弁は全閉し、燃料ガス供給流量は無くなる。この時点で制御対象場所である減圧弁下流側の燃料ガス温度を検出してガスタービン供給燃料ガス温度目標設定値との偏差を比例積分演算器に入力して温度調節弁開度を算出する制御方式を採用した場合、温度調節弁は減圧弁下流側の温度に依存することになり、ガスタービン点火直後のガスタービン供給燃料ガス温度が変動することが予想される。
【００３７】
この対策として、供給される燃料ガス圧力が変動しない場合において、減圧加温装置起動からガスタービン点火までの期間は、図８に示されているように、供給燃料ガス圧力から減圧弁出口目標設定圧力まで減圧した時の温度降下量をガスタービン供給燃料ガス目標設定値に加算して減圧弁前目標燃料ガス温度を求め、これと減圧弁入口燃料ガス温度１１（図８においては、加熱器出口温度を用いた例を示す）から加熱器側と加熱器バイパス側の分配量を算出し、分配量に見合った温度調節弁開度とする。本実施例により、供給される燃料ガス圧力が変動しない場合において、ガスタービン点火直後の燃料ガス温度の安定化が図れる。
【００３８】
もう一つの実施例は、供給される燃料ガス圧力が変動する場合において、減圧加温装置起動からガスタービン点火までの期間は、図９に示されているように、減圧弁入口燃料ガス圧力１２から減圧弁出口目標設定圧力まで減圧した時の温度降下量をガスタービン供給燃料ガス温度目標設定値に加算して減圧弁前目標燃料ガス温度を求め、これと減圧弁入口燃料ガス温度１１（図９においては、加熱器出口温度を用いた例を示す）から加熱器側と加熱器バイパス側の分配量を算出し、分配量に見合った温度調節弁開度とする。
【００３９】
本実施例により、供給される燃料ガス圧力が変動する場合において、ガスタービン点火直後の燃料ガス温度の安定化が図れる。
【００４０】
以上説明してきたようにこのように構成されたスタービン燃料ガス減圧加温装置であると、加熱媒体供給源から加熱器までの管路上に遮断弁７を設置し、制御対象である減圧弁出口の燃料ガス温度により制御目標値に対し的確に制御が可能となる。また、ガスタービン負荷遮断、ランバック等の燃料流量急減時において、負荷遮断等の事象発生信号、出力信号、燃料ガス流量信号等により先行的に遮断弁を動作させることで燃料ガス流量急減時にも、ガスタービン供給燃料ガス温度をガスタービン許容燃料ガス温度上昇幅内に抑えることができる。
【００４１】
また、ガスタービン供給燃料ガス温度目標設定値を下げて積極的に燃料ガスの加熱を停止する運転を行うことで、燃料ガス加熱量が低減されプラントトータル効率の向上が図れる。また、加熱媒体供給源から加熱器までの管路上に設置した加熱器器内圧力を調節する圧力調節弁８を設置し、通常運転中は圧力調節弁により加熱器器内圧力を一定に制御するが、ガスタービン負荷遮断、ランバック等の燃料流量急減時に圧力設定値を下げることで、加熱器供給熱源を遮断し燃料ガスの加熱を停止し、ガスタービン負荷遮断、ランバック等の燃料ガス流量急減時に加熱器器内圧力設定値を下げることで遮断弁を使用することなく燃料ガスの加温を停止することが可能となり、ガスタービン供給燃料ガス温度をガスタービン許容燃料ガス温度上昇幅内に抑えることができる。
【００４２】
また、燃料ガス系統の加熱器側と加熱器バイパス側の分岐から合流までの加熱器側管路上に遮断弁を設置し、制御対象である減圧弁出口の燃料ガス温度により制御目標値に対し的確に制御が可能となる。また、再び燃料ガスの加温が必要になったときには遮断弁を開して加熱器に燃料ガスを流すことで即対応することができる。また、ガスタービン負荷遮断、ランバック等の燃料流量急減時において、負荷遮断等の事象発生信号、出力信号、燃料ガス流量信号等により先行的に遮断弁を動作させることで燃料ガス流量急減時にも、ガスタービン供給燃料ガス温度をガスタービン許容燃料ガス温度上昇幅内に抑えることができる。
【００４３】
また、ガスタービン供給燃料ガス温度目標設定値を下げて積極的に燃料ガスの加熱を停止する運転を行うことで、燃料ガス加熱量が低減されプラントトータル効率の向上が図れる。また、加熱器側と加熱器バイパス側の分岐点あるいは合流点に三方弁を設置することで加熱器バイパス側に設置した温度調節弁と加熱器側に設置した遮断弁の機能を１弁で実施することができる。
【００４４】
また、減圧加温装置起動からガスタービン点火までの期間は、減圧弁入口燃料ガス温度から温度調節弁開度を算出することにより、供給される燃料ガス圧力が変動しない場合において、ガスタービン点火直後の燃料ガス温度の安定化が図れる。また、減圧加温装置起動からガスタービン点火までの期間は、減圧弁入口燃料ガス圧力および減圧弁入口燃料ガス温度から温度調節弁開度を算出することにより、供給される燃料ガス圧力が変動する場合においてガスタービン点火直後の燃料ガス温度の安定化が図れるのである。
【００４５】
【発明の効果】
以上説明してきたように本発明によれば、ガスタービンの燃料ガス減圧加温運転をする場合、燃料ガス基地から供給される燃料ガスの圧力・温度の変動およびガスタ−ビン燃料消費量の変動による必要加熱量の変動に対しても、設備規模の増大、配管・機器材質の強化、補助蒸気などの加熱媒体使用量の増加を抑え、ガスタービン供給燃料ガスを適正な温度で供給することができる。
【図面の簡単な説明】
【図１】本発明のガスタービン燃料ガス減圧加温装置の一実施例を示す概略系統図である。
【図２】ガスタービン運転必要燃料ガス温度範囲を示す図である。
【図３】ガスタービン運転必要燃料ガス温度変化範囲を示す図である。
【図４】本発明のガスタービン燃料ガス減圧加温装置の遮断弁の動作特性を示す図である。
【図５】燃料ガス温度目標設定値と加熱媒体使用量の関係を示す図である。
【図６】本発明のガスタービン燃料ガス減圧加温装置の他の実施例を示す概略系統図である。
【図７】本発明のガスタービン燃料ガス減圧加温装置の他の実施例を示す概略系統図である。
【図８】本発明のガスタービン燃料ガス減圧加温装置の他の実施例を示す概略系統図である。
【図９】本発明のガスタービン燃料ガス減圧加温装置の他の実施例を示す概略系統図である。
【図１０】本発明のガスタービン燃料ガス減圧加温装置の他の実施例を示す概略系統図である。
【符号の説明】
１…加熱器、２…減圧弁（減圧装置）、３…加熱器バイパス管路、４…減圧弁出口温度検出器、５…温度調節弁（流量調整弁）、６…加熱媒体供給管路、７…加熱媒体遮断弁、８…加熱器器内圧力調節弁、９…加熱器器内圧力検出器、１０…加熱器ガス遮断弁、１１…減圧弁入口温度検出器、１２…減圧弁入口圧力検出器、１３…温度調節弁（三方口弁）。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a gas turbine fuel gas pressure reducing and heating apparatus, and more particularly, a gas turbine fuel gas provided with a bypass pipe and a flow rate adjusting valve in a heater and controlling the fuel gas temperature by controlling the flow rate adjusting valve. The present invention relates to a vacuum heating apparatus.
[0002]
[Prior art]
This type of fuel gas warming device, which has been generally adopted in the past, is often installed in the fuel system for city gas supply, and is a warm water warming system that provides stable controllability with less change in gas flow rate. In the steam heating system, variable heater drain level control is adopted.
[0003]
Also known is a bypass pipe that bypasses the heater, and a temperature control valve that controls the fuel gas temperature at the outlet of the pressure reducing device is installed on this pipe. Examples of this type of fuel gas decompression and heating apparatus include Japanese Patent Application Laid-Open No. 9-236025 and Japanese Patent Application Laid-Open No. 6-102903.
[0004]
[Problems to be solved by the invention]
The fuel gas decompression and heating apparatus thus formed is not particularly problematic when employed in a city gas fuel gas system. However, this fuel gas decompression and heating apparatus is used in a gas turbine or the like. The following items need to be considered when applying. That is, (1) there is a large change in fuel flow rate, (2) it is necessary to supply fuel gas within the gas turbine required fuel gas pressure range, and (3) within the gas turbine required fuel gas temperature range. This means that it is necessary to supply fuel gas, that is, a fuel gas decompression and heating apparatus that satisfies fuel supply conditions much stricter than the fuel gas system for supplying city gas is required.
[0005]
Since gas turbines are often used for power generation facilities, starting with gas turbine startup, ignition, acceleration, parallel, and load increase are performed. When the power supply is stopped, the load is dropped from the rated load, and the gas turbine is stopped after disconnection and fire extinguishing.
[0006]
For such a gas turbine operation, it is necessary to make the change range of the fuel gas temperature as small as possible at the time of ignition and at the time of combustor switching in the case of employing a dry low NOx combustor. The reason is that when the fuel gas temperature is high, the fuel gas flow rate decreases as the fuel gas specific gravity decreases, the fuel-air ratio decreases and approaches the flame loss range, and conversely when the fuel gas temperature is high, This is to approach the flashback range.
[0007]
In addition, in FCB operation corresponding to a sudden decrease in power generation load and runback operation for the purpose of protecting gas turbine equipment, the flow rate of fuel gas decreases rapidly, so it is necessary to prevent the loss of flame due to an increase in fuel gas temperature. .
[0008]
In the conventional heater drain level variable control, the heat level increasing operation can be followed because the drain level quickly drops by opening the drain level adjusting valve. However, in the heat level decreasing operation, the drain level adjusting valve is closed but heated. Since it takes time for the medium to condense and drain, the gas turbine supply temperature rises when the fuel gas flow rate suddenly decreases and rises to the saturation temperature of the heater internal pressure.
[0009]
Since the heater internal pressure is generally set to be equivalent to the saturated steam pressure at the maximum operating temperature of the gas turbine fuel gas supply system, the fuel gas temperature instantaneously changes from room temperature to 100 ° C. or higher. Thus, the possibility of gas turbine flame loss may increase.
[0010]
Further, in the case where a pipe bypassing the heater and a temperature control valve (flow control valve) for controlling the fuel gas temperature at the outlet of the pressure reducing device are installed on the pipe, when the temperature control valve is in a controlled state, When the fuel gas needs to be heated, the temperature control valve operates in the opening direction and flows to the bypass side even when the amount of heat given to the fuel increases or when the fuel suddenly decreases. Although the fuel gas temperature rise can be suppressed by increasing the fuel gas flow rate, if the temperature control valve is fully opened, the fuel gas temperature becomes uncontrollable and the fuel gas temperature at the outlet of the decompression device may fluctuate. is expected.
[0011]
In order to avoid this, it is necessary to set the target pressure value of the fuel gas temperature at the outlet of the decompression device to be high, and the temperature control valve must be operated at an intermediate opening under all design conditions. It is possible to increase the amount of heating medium such as auxiliary steam and auxiliary steam.
[0012]
In the present invention, when the fuel gas decompression and heating operation of the gas turbine is performed, the fluctuation of the required heating amount due to the fluctuation of the pressure and temperature of the fuel gas supplied from the fuel gas base and the fluctuation of the gas turbine fuel consumption is also considered. This type of gas turbine fuel gas depressurization that can supply gas turbine supply fuel gas at an appropriate temperature while suppressing increase in equipment scale, reinforcement of piping and equipment materials, and increase in the use of heating medium such as auxiliary steam It is to provide a temperature device.
[0013]
[Means for Solving the Problems]
That is, the present invention is provided in a gas turbine fuel gas supply system, and is provided with a heater for heating the fuel gas, a bypass pipe for bypassing a part of the fuel gas passing through the heater, and the bypass pipe. And a pressure reducing device that is disposed downstream of the heater and depressurizes the gas heated by the heater. The fuel at the outlet of the pressure reducing device is controlled by the flow rate adjusting valve. In the gas turbine fuel gas pressure reducing and heating apparatus configured to control the gas temperature, the heating medium supply system of the heater is provided with a heating medium cutoff valve or a control valve for blocking the flow rate of the heating medium, and is supplied to the gas turbine. When there is no need to heat the fuel gas, the heating medium supplied to the heater is shut off by the heating medium shut-off valve so as to achieve the intended purpose.
[0014]
In this case, the shutoff valve or the control valve is formed so as to shut off when the temperature of the fuel gas at the outlet of the pressure reducing device is increased. For example, it is configured so as to perform a shut-off operation by detecting an occurrence signal of an event that causes an increase in the fuel gas temperature at the outlet of the decompression device, such as load shut-off or run-back. Further, the shut-off valve or the like is formed so as to shut off when the fuel gas temperature at the outlet of the pressure reducing device is equal to or higher than a specified value.
[0015]
Further, the present invention is provided in a gas turbine fuel gas supply system, provided with a heater for heating the fuel gas, a bypass line for bypassing a part of the fuel gas passing through the heater, and the bypass line. And a pressure reducing device that is disposed downstream of the heater and depressurizes the gas heated by the heater. The fuel at the outlet of the pressure reducing device is controlled by the flow rate adjusting valve. In the gas turbine fuel gas decompression and heating apparatus configured to control the gas temperature, the heating medium supply system of the heater is provided with a heating medium cutoff valve for blocking a flow rate of the heating medium, and the heating medium cutoff valve is When the fuel gas supplied to the gas turbine is not required to be controlled by the heater internal pressure, the heating medium is controlled by lowering the heater internal pressure control target set value. It is obtained so as to cut off. Alternatively, in place of the shut-off valve, a pressure adjustment valve for controlling the pressure in the heater is provided on the pipe line from the heating medium supply source to the heater, and the fuel gas supplied to the gas turbine is not heated. The internal pressure control target set value is lowered to shut off the heating medium.
[0016]
Further, the present invention is provided in a gas turbine fuel gas supply system, provided with a heater for heating the fuel gas, a bypass line for bypassing a part of the fuel gas passing through the heater, and the bypass line. And a pressure reducing device that is disposed downstream of the heater and depressurizes the gas heated by the heater. The fuel at the outlet of the pressure reducing device is controlled by the flow rate adjusting valve. In the gas turbine fuel gas pressure reducing and heating apparatus configured to control the gas temperature, a cutoff valve is provided on a heater side pipe line from the branch of the heater and the heater bypass to the merge, and the fuel supplied to the gas turbine When there is no need to heat the gas, the shut-off valve is shut off, and the fuel gas is allowed to flow to the heater bypass side.
[0017]
In this case, the shutoff valve or the regulating valve is formed so as to operate when the fuel gas temperature at the outlet of the pressure reducing device rises. For example, it is configured to operate by detecting a generation signal of an event that causes an increase in the fuel gas temperature at the outlet of the decompression device, such as load interruption or runback. Further, the shut-off valve is formed so that the shut-off operation is performed when the fuel gas temperature at the outlet of the pressure reducing device is equal to or higher than a specified value.
[0018]
Further, a heater that is disposed in the gas turbine fuel gas supply system and that heats the fuel gas, a bypass pipe that bypasses a part of the fuel gas that passes through the heater, and a flow rate provided on the bypass pipe And a pressure reducing device that is disposed downstream of the heater and depressurizes the gas heated by the heater, and controls the flow rate adjusting valve to control the fuel gas temperature at the outlet of the pressure reducing device. In the gas turbine fuel gas pressure reducing and heating apparatus controlled, the flow rate adjustment valve is controlled by the fuel gas temperature upstream of the pressure reducing apparatus.
[0019]
Further, a heater that is disposed in the gas turbine fuel gas supply system and that heats the fuel gas, a bypass pipe that bypasses a part of the fuel gas that passes through the heater, and a flow rate provided on the bypass pipe And a pressure reducing device that is disposed downstream of the heater and depressurizes the gas heated by the heater, and controls the flow rate adjusting valve to control the fuel gas temperature at the outlet of the pressure reducing device. In the gas turbine fuel gas pressure reducing and heating apparatus to be controlled, the control of the flow rate adjusting valve is controlled by the fuel gas temperature and pressure on the upstream side of the pressure reducing apparatus.
[0020]
In other words, the gas turbine fuel gas pressure reducing and heating apparatus formed in this way improves the followability of the gas turbine required heating amount fluctuation in each operation state of the gas turbine, and there is no need to heat the fuel gas It is possible to cut off the heating amount, supply fuel gas at an appropriate temperature without increasing the scale of equipment, strengthening piping and equipment materials, and increasing the amount of heating medium used such as auxiliary steam. It becomes possible.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on the illustrated embodiments. FIG. 1 is a diagram showing the system of the gas turbine fuel gas pressure reducing and heating apparatus. The system configuration of the present embodiment passes through a heater 1 for heating the gas turbine fuel gas supplied from the fuel gas base, a pressure reducing valve (pressure reducing device) 2 for reducing the pressure of the heated fuel gas, and the heater 1. A
[0022]
Here, the pressure and temperature of the fuel gas supplied to the pressure reducing and heating apparatus vary depending on the operating state and season of other power plants, and the gas turbine consumption fuel gas flow rate varies depending on the operating state. The required fuel gas heating amount in the heater is expressed by the following equation.
[0023]
[Expression 1]
Q = G × (To × Cpo−Ti × Cpi) (1)
here,
Q: Fuel gas required heating amount, G: Fuel gas consumption flow rate,
To: Heater outlet fuel gas temperature, Cpo: Heater outlet fuel gas specific heat,
Ti: Heater inlet fuel gas temperature, Cpi: Heater inlet fuel gas specific heat,
It is. Note that To is a value obtained by adding the temperature drop when the pressure is reduced from the supply pressure to the gas turbine required pressure to the target temperature after the pressure reduction.
[0024]
As a result, the required heating amount of the fuel gas changes due to fluctuations in the pressure, temperature, and flow rate of the supplied fuel gas. As shown in FIG. 2, generally, the gas gas required for the gas turbine needs to be supplied within the range from the minimum required fuel gas temperature to the maximum allowable gas temperature of the gas turbine. The minimum fuel gas temperature required for the gas turbine is determined by the dew point temperature of the gas gas supplied to the gas turbine, and the allowable maximum fuel gas temperature for the gas turbine is determined by the allowable temperature for the material of the valve used in the fuel gas system. If the turbine fuel gas system is modified, the maximum operating temperature of the existing equipment may be reached.
[0025]
Further, during operation of the gas turbine, the gas turbine supply fuel gas needs to be supplied within the allowable variation range of the gas turbine as shown in FIG. When a large load drop such as gas turbine runback occurs, the fuel gas consumption decreases rapidly, and the required heating amount of the fuel gas decreases rapidly. If this rapid decrease cannot be followed, the actual heating amount is larger than the required heating amount of the fuel gas. Therefore, the gas turbine supply fuel gas temperature rapidly rises and the gas turbine combustion stability decreases, so a system configuration and a control method that can sufficiently follow the fluctuation of the required heating amount of the fuel gas with respect to the fluctuation of the gas turbine fuel flow rate are required. Become.
[0026]
In this embodiment, during normal operation, the temperature of the fuel gas at the outlet of the pressure reducing device is controlled by the temperature control valve 5 installed in the heater bypass system. However, even when the temperature control valve 5 is fully opened, the fuel gas flows also to the heater side. Therefore, even when there is no need for heating, a part of the fuel gas is heated. When the fuel gas temperature rises, there is no means for lowering the temperature, and the gas turbine allowable fuel gas temperature rise may be exceeded.
[0027]
Therefore, the shutoff valve 7 installed on the pipe line from the heating medium supply source to the heater has a fuel gas temperature at the outlet of the pressure reducing valve, as shown in FIG. By operating when the heating cutoff temperature set value set during the allowable fuel gas temperature rise range is exceeded, the heater supply heat source is shut off and heating of the fuel gas is stopped. According to this embodiment, the control target value can be accurately controlled by the fuel gas temperature at the outlet of the pressure reducing valve that is the control target.
[0028]
In addition, when the fuel flow rate is suddenly decreased, such as when the gas turbine load is cut off or the runback is performed, the change in the fuel gas temperature has a large time delay with respect to the change in the fuel gas flow rate. Therefore, when the fuel flow rate suddenly decreases, if the shutoff valve is operated due to the increase in the fuel gas temperature at the outlet of the pressure reducing valve, there is a possibility that the fuel gas temperature will rise further with a delay and exceed the gas turbine allowable fuel gas temperature increase range. Therefore, the gas turbine supply fuel gas temperature rises even if the fuel gas flow rate suddenly decreases by operating the shutoff valve in advance by an event occurrence signal such as load shutoff, output signal, fuel gas flow rate signal, etc. Can be kept within the width.
[0029]
As shown in FIG. 5, the fuel gas heating amount is reduced by reducing the gas turbine supply fuel gas temperature target set value and actively stopping the heating of the fuel gas, thereby reducing the total plant efficiency. Improvement can be achieved.
[0030]
Next, another embodiment will be described. The system configuration of this embodiment is shown in FIG. The same reference numerals as those in the above-described embodiments denote the same components, and detailed description thereof will be omitted here. In this embodiment, a pressure control valve that adjusts the pressure inside the heater installed on the pipeline from the heating medium supply source to the heater is installed, and the pressure inside the heater is kept constant by the pressure regulation valve during normal operation. Although it is controlled, the heating medium supply source is shut off and fuel gas overheating is stopped by lowering the pressure set value when the fuel flow rate is suddenly reduced, such as gas turbine load shutoff or runback.
[0031]
According to the present embodiment, it is possible to stop the heating of the fuel gas without using the shut-off valve by lowering the pressure setting value in the heater when the fuel gas flow rate suddenly decreases such as gas turbine load shutoff or runback. Thus, the gas turbine supply fuel gas temperature can be suppressed within the gas turbine allowable fuel gas temperature increase range.
[0032]
Next, another embodiment will be described. The system configuration of this embodiment is shown in FIG. The same reference numerals as those in the above-described embodiments denote the same components, and detailed description thereof will be omitted here. In this embodiment, the
[0033]
According to this embodiment, the control target value can be accurately controlled by the fuel gas temperature at the outlet of the pressure reducing valve that is the control target. When the fuel gas needs to be heated again, it can be dealt with immediately by opening the shut-off valve and flowing the fuel gas through the heater.
[0034]
In addition, when the fuel flow rate is suddenly decreased, such as when the gas turbine load is cut off or the runback is performed, the change in the fuel gas temperature has a large time delay with respect to the change in the fuel gas flow rate. Therefore, when the shutoff valve is operated due to the increase in the fuel gas temperature at the pressure reducing valve outlet when the fuel flow rate is suddenly reduced, the fuel gas temperature at the pressure reducing valve outlet may rise further with a delay and exceed the allowable range of the gas turbine allowable fuel gas temperature. . Therefore, the gas turbine supply fuel gas temperature rises even if the fuel gas flow rate suddenly decreases by operating the shutoff valve in advance by an event occurrence signal such as load shutoff, output signal, fuel gas flow rate signal, etc. Can be kept within the width.
[0035]
In addition, by lowering the gas turbine supply fuel gas temperature target set value and actively stopping the heating of the fuel gas, the fuel gas heating amount is reduced and the plant total efficiency can be improved. Further, as shown in FIG. 10, a temperature control valve 5 installed on the heater bypass side and a shut-off valve installed on the heater side by installing a three-way valve at the branching point or junction of the heater side and the heater bypass side. Ten functions can be implemented with one valve.
[0036]
At startup, it is necessary to start the decompression and heating system before ignition of the gas turbine, but since there is no gas turbine fuel gas consumption before ignition of the gas turbine, the fuel gas pressure downstream of the decompression valve is equal to the gas turbine required pressure. At this point, the pressure reducing valve is fully closed, and the fuel gas supply flow rate disappears. Control that detects the fuel gas temperature downstream of the pressure reducing valve that is the control target at this point, and inputs the deviation from the target set value of the gas gas supplied to the gas turbine to the proportional integration calculator to calculate the temperature control valve opening When the method is adopted, the temperature control valve depends on the temperature on the downstream side of the pressure reducing valve, and the gas turbine supply fuel gas temperature immediately after the gas turbine ignition is expected to fluctuate.
[0037]
As a countermeasure, when the supplied fuel gas pressure does not fluctuate, the period from the start of the pressure reducing and heating apparatus to the gas turbine ignition is set from the supplied fuel gas pressure to the pressure reducing valve outlet target setting as shown in FIG. in the amount of temperature drop of the seek is added to the gas turbine supply fuel gas setpoint pressure reducing valve before the target fuel gas temperature, this and the reduced pressure valve inlet fuel gas temperature 11 (Fig. 8 when the pressure was reduced to pressure heater outlet The distribution amount on the heater side and the heater bypass side is calculated from the example using temperature, and the temperature control valve opening corresponding to the distribution amount is calculated. According to this embodiment, when the supplied fuel gas pressure does not fluctuate, the fuel gas temperature immediately after ignition of the gas turbine can be stabilized.
[0038]
In another embodiment, when the supplied fuel gas pressure fluctuates, the period from the start of the pressure reducing and heating apparatus to the gas turbine ignition is 12 as shown in FIG. temperature drop to determine the sum to pressure reducing valve before the target fuel gas temperature in the gas turbine supply fuel gas temperature setpoint, which a reduction valve inlet fuel gas temperature 11 (Fig. when the pressure was reduced to a pressure reducing valve outlet target set pressure from 9 shows an example in which the heater outlet temperature is used), and the distribution amount on the heater side and the heater bypass side is calculated, and the temperature control valve opening corresponding to the distribution amount is set.
[0039]
According to this embodiment, when the supplied fuel gas pressure fluctuates, the fuel gas temperature immediately after ignition of the gas turbine can be stabilized.
[0040]
As described above, in the Sturbine fuel gas pressure reducing and heating apparatus configured as described above, the shut-off valve 7 is installed on the pipeline from the heating medium supply source to the heater, and the outlet of the pressure reducing valve that is the control target is installed. The control with respect to the control target value can be accurately performed by the fuel gas temperature. In addition, when the fuel flow rate suddenly decreases, such as when the gas turbine load is cut off or runback, the shutoff valve is operated in advance by an event occurrence signal such as a load cutoff, output signal, fuel gas flow rate signal, etc. The gas turbine supply fuel gas temperature can be suppressed within the gas turbine allowable fuel gas temperature increase range.
[0041]
Further, by performing an operation in which the heating of the fuel gas is actively stopped by lowering the gas turbine supply fuel gas temperature target set value, the fuel gas heating amount can be reduced and the plant total efficiency can be improved. In addition, a pressure control valve 8 for adjusting the pressure in the heater installed on the pipe line from the heating medium supply source to the heater is installed, and the pressure in the heater is controlled to be constant by the pressure control valve during normal operation. However, by reducing the pressure set value when the fuel flow rate suddenly decreases, such as when the gas turbine load is cut off or run back, the heater supply heat source is shut off and the heating of the fuel gas is stopped. It is possible to stop the heating of the fuel gas without using the shut-off valve by lowering the heater pressure setting value at the time of sudden decrease, and the gas turbine supply fuel gas temperature is within the gas turbine allowable fuel gas temperature rise range. Can be suppressed.
[0042]
In addition, a shut-off valve is installed on the heater side pipeline from the branch on the heater side and the heater bypass side to the merge of the fuel gas system, and the control target value is accurately determined by the fuel gas temperature at the outlet of the pressure-reducing valve to be controlled. Can be controlled. When the fuel gas needs to be heated again, it can be dealt with immediately by opening the shut-off valve and flowing the fuel gas through the heater. In addition, when the fuel flow rate suddenly decreases, such as when the gas turbine load is cut off or runback, the shutoff valve is operated in advance by an event occurrence signal such as a load cutoff, output signal, fuel gas flow rate signal, etc. The gas turbine supply fuel gas temperature can be suppressed within the gas turbine allowable fuel gas temperature increase range.
[0043]
Further, by performing an operation in which the heating of the fuel gas is actively stopped by lowering the gas turbine supply fuel gas temperature target set value, the fuel gas heating amount can be reduced and the plant total efficiency can be improved. Also, by installing a three-way valve at the junction or junction of the heater side and the heater bypass side, the temperature control valve installed on the heater bypass side and the shut-off valve installed on the heater side can be implemented with a single valve. can do.
[0044]
Further, the period from the start of the pressure reducing and heating apparatus to the gas turbine ignition is calculated immediately after the gas turbine ignition in the case where the supplied fuel gas pressure does not fluctuate by calculating the temperature control valve opening from the pressure reducing valve inlet fuel gas temperature. The fuel gas temperature can be stabilized. Further, during the period from the start of the pressure reducing and heating apparatus to the gas turbine ignition, the supplied fuel gas pressure varies by calculating the temperature control valve opening from the pressure reducing valve inlet fuel gas pressure and the pressure reducing valve inlet fuel gas temperature. In this case, the fuel gas temperature immediately after ignition of the gas turbine can be stabilized.
[0045]
【The invention's effect】
As described above, according to the present invention, when the fuel gas decompression and heating operation of the gas turbine is performed, it is caused by fluctuations in the pressure and temperature of the fuel gas supplied from the fuel gas base and fluctuations in the gas turbine fuel consumption. Even when the required heating amount fluctuates, it is possible to supply the gas turbine supply fuel gas at an appropriate temperature by suppressing an increase in equipment scale, reinforcement of piping and equipment materials, and an increase in the amount of heating medium used such as auxiliary steam. .
[Brief description of the drawings]
FIG. 1 is a schematic system diagram showing an embodiment of a gas turbine fuel gas decompression and heating apparatus according to the present invention.
FIG. 2 is a diagram showing a fuel gas temperature range required for gas turbine operation.
FIG. 3 is a diagram showing a range of change in fuel gas temperature required for gas turbine operation.
FIG. 4 is a diagram showing operating characteristics of a shutoff valve of the gas turbine fuel gas pressure reducing and heating apparatus of the present invention.
FIG. 5 is a diagram showing a relationship between a target fuel gas temperature set value and a heating medium usage amount.
FIG. 6 is a schematic system diagram showing another embodiment of the gas turbine fuel gas decompression and heating apparatus of the present invention.
FIG. 7 is a schematic system diagram showing another embodiment of the gas turbine fuel gas decompression and heating apparatus of the present invention.
FIG. 8 is a schematic system diagram showing another embodiment of the gas turbine fuel gas decompression and heating apparatus of the present invention.
FIG. 9 is a schematic system diagram showing another embodiment of the gas turbine fuel gas decompression and heating apparatus of the present invention.
FIG. 10 is a schematic system diagram showing another embodiment of the gas turbine fuel gas decompression and heating apparatus of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Heater, 2 ... Pressure reducing valve (pressure reducing device), 3 ... Heater bypass line, 4 ... Pressure reducing valve outlet temperature detector, 5 ... Temperature control valve (flow rate control valve), 6 ... Heating medium supply line, DESCRIPTION OF SYMBOLS 7 ... Heating medium shut-off valve, 8 ... Heater device pressure control valve, 9 ... Heater device pressure detector, 10 ... Heater gas shut-off valve, 11 ... Pressure reducing valve inlet temperature detector, 12 ... Pressure reducing valve inlet pressure Detector, 13 ... temperature control valve (three-way port valve).
Claims (9)
前記加熱器の加熱媒体供給系に、ガスタービンに供給される燃料ガスの温度上昇時に動作して加熱器に供給される加熱媒体を遮断する加熱媒体遮断弁あるいは調節弁を設けたことを特徴とするガスタービン燃料ガス減圧加温装置。A heater arranged in the gas turbine fuel gas supply system for heating the fuel gas, a bypass pipe for bypassing a part of the fuel gas passing through the heater, and a flow rate adjusting valve provided on the bypass pipe And a pressure reducing device that is disposed downstream of the heater and depressurizes the gas heated by the heater, and controls the fuel gas temperature at the outlet of the pressure reducing device by controlling the flow rate adjusting valve. In the gas turbine fuel gas depressurizing and heating apparatus,
The heating medium supply system of the heater is provided with a heating medium cutoff valve or a control valve that operates when the temperature of the fuel gas supplied to the gas turbine rises and shuts off the heating medium supplied to the heater. Gas turbine fuel gas decompression and heating device.
加熱媒体供給源から前記加熱器までの管路上に加熱器器内圧力を制御する圧力調整弁を設けると共に、ガスタービンに供給される燃料ガス流量急減時に加熱器器内圧力設定値を下げることで前記圧力調整弁により加熱媒体供給源を遮断するようにしたことを特徴とするガスタービン燃料ガス減圧加温装置。A heater arranged in the gas turbine fuel gas supply system for heating the fuel gas, a bypass pipe for bypassing a part of the fuel gas passing through the heater, and a flow rate adjusting valve provided on the bypass pipe And a pressure reducing device that is disposed downstream of the heater and depressurizes the gas heated by the heater, and controls the fuel gas temperature at the outlet of the pressure reducing device by controlling the flow rate adjusting valve. In the gas turbine fuel gas depressurizing and heating apparatus,
A pressure regulating valve for controlling the pressure in the heater is provided on the pipe line from the heating medium supply source to the heater, and the pressure in the heater is reduced when the flow rate of the fuel gas supplied to the gas turbine is suddenly reduced. A gas turbine fuel gas decompression and heating apparatus characterized in that the heating medium supply source is shut off by the pressure regulating valve .
前記バイパス管路の分岐から合流までの加熱器側管路上に遮断弁あるいは調節弁を設けると共に、この遮断弁あるいは調節弁を、ガスタービンに供給される燃料ガス温度が加熱遮断温度設定値以上となったとき遮断動作させるようにしたことを特徴とするガスタービン燃料ガス減圧加温装置。A heater arranged in the gas turbine fuel gas supply system for heating the fuel gas, a bypass pipe for bypassing a part of the fuel gas passing through the heater, and a flow rate adjusting valve provided on the bypass pipe And a pressure reducing device that is disposed downstream of the heater and depressurizes the gas heated by the heater, and controls the fuel gas temperature at the outlet of the pressure reducing device by controlling the flow rate adjusting valve. In the gas turbine fuel gas depressurizing and heating apparatus,
Co The provision of cut-off valve or control valve to the heater side pipe path leading to the merging from the branch of the bypass line, the shut-off valve or control valve, the fuel gas temperature is heated shutdown temperature set value supplied to the gas turbine A gas turbine fuel gas depressurizing and heating apparatus characterized in that a shut-off operation is performed when the above is reached .
前記減圧装置での減圧による燃料ガス温度降下量をガスタービン供給燃料ガス温度目標設定値に加算して減圧装置入口目標燃料ガス温度を求め、前記減圧装置の上流側で検知された燃料ガス温度が前記減圧装置入口目標燃料ガス温度となるよう前記流量調整弁を制御するようにしたことを特徴とするガスタービン燃料ガス減圧加温装置。A heater arranged in the gas turbine fuel gas supply system for heating the fuel gas, a bypass pipe for bypassing a part of the fuel gas passing through the heater, and a flow rate adjusting valve provided on the bypass pipe And a pressure reducing device that is disposed downstream of the heater and depressurizes the gas heated by the heater, and controls the fuel gas temperature at the outlet of the pressure reducing device by controlling the flow rate adjusting valve. In the gas turbine fuel gas depressurizing and heating apparatus,
The amount of fuel gas temperature drop due to decompression in the decompression device is added to the target gas turbine supply fuel gas temperature set value to obtain the target fuel gas temperature at the decompression device inlet, and the fuel gas temperature detected upstream of the decompression device is The gas turbine fuel gas decompression and heating apparatus is characterized in that the flow rate adjustment valve is controlled to be the target fuel gas temperature at the decompression apparatus inlet .
前記減圧装置の入口側で検出された燃料ガス圧力とガスタービン供給燃料ガス圧力目標設定値から前記減圧装置での減圧による燃料ガス温度降下量を求め、この温度降下量をガスタービン供給燃料ガス温度目標設定値に加算して減圧装置入口目標燃料ガス温度を求め、前記減圧装置の上流側で検出された燃料ガス温度が前記減圧装置入口目標燃料ガス温度となるように前記流量調整弁を制御するようにしたことを特徴とするガスタービン燃料ガス減圧加温装置。A heater arranged in the gas turbine fuel gas supply system for heating the fuel gas, a bypass pipe for bypassing a part of the fuel gas passing through the heater, and a flow rate adjusting valve provided on the bypass pipe And a pressure reducing device that is disposed downstream of the heater and depressurizes the gas heated by the heater, and controls the fuel gas temperature at the outlet of the pressure reducing device by controlling the flow rate adjusting valve. In the gas turbine fuel gas depressurizing and heating apparatus,
From the fuel gas pressure detected at the inlet side of the decompression device and the target gas turbine supply fuel gas pressure set value, the amount of fuel gas temperature drop due to decompression in the decompression device is obtained, and this temperature fall amount is calculated as the gas turbine supply fuel gas temperature. The target fuel gas temperature is obtained by adding to the target set value, and the flow rate adjustment valve is controlled so that the fuel gas temperature detected upstream of the pressure reducing device becomes the target fuel gas temperature at the pressure reducing device inlet. A gas turbine fuel gas depressurizing and heating apparatus characterized by being configured as described above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20769998A JP3836604B2 (en) | 1998-07-23 | 1998-07-23 | Gas turbine fuel gas decompression and heating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20769998A JP3836604B2 (en) | 1998-07-23 | 1998-07-23 | Gas turbine fuel gas decompression and heating system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000038929A JP2000038929A (en) | 2000-02-08 |
| JP3836604B2 true JP3836604B2 (en) | 2006-10-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20769998A Expired - Fee Related JP3836604B2 (en) | 1998-07-23 | 1998-07-23 | Gas turbine fuel gas decompression and heating system |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4551548B2 (en) * | 2000-10-04 | 2010-09-29 | 大阪瓦斯株式会社 | Power generation facility and power generation method using the same |
| US8572975B2 (en) * | 2009-06-08 | 2013-11-05 | General Electric Company | Systems relating to turbine engine control and operation |
| JP5822487B2 (en) * | 2011-02-28 | 2015-11-24 | 三菱日立パワーシステムズ株式会社 | Gas turbine plant and control method thereof |
| KR20180033968A (en) * | 2016-09-27 | 2018-04-04 | 에스케이가스 주식회사 | Module for providing gas and facility for providing gas having the same |
| WO2019167276A1 (en) * | 2018-03-02 | 2019-09-06 | 三菱日立パワーシステムズ株式会社 | Fuel gas storage system for gas turbine and method for supplying fuel gas to gas turbine |
| EP3594475A1 (en) | 2018-07-10 | 2020-01-15 | Siemens Aktiengesellschaft | Method for operating a gas turbine plant with gaseous fuel |
| JP2021055867A (en) * | 2019-09-27 | 2021-04-08 | 三菱パワー株式会社 | Exhaust heat recovery boiler, steam turbine equipment, and gasification equipment |
| CN112160838A (en) * | 2020-08-31 | 2021-01-01 | 大连派思燃气设备有限公司 | Electric heating device before starting combustion engine |
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1998
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| JP2000038929A (en) | 2000-02-08 |
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