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JP4130909B2 - Double fuel-fired gas turbine fuel supply system - Google Patents

Double fuel-fired gas turbine fuel supply system Download PDF

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JP4130909B2
JP4130909B2 JP2003334499A JP2003334499A JP4130909B2 JP 4130909 B2 JP4130909 B2 JP 4130909B2 JP 2003334499 A JP2003334499 A JP 2003334499A JP 2003334499 A JP2003334499 A JP 2003334499A JP 4130909 B2 JP4130909 B2 JP 4130909B2
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valve
gas
fuel
purge air
supply system
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JP2005098243A (en
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ラミーズ モハメッド
雅美 佐藤
信一 永井
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Hitachi Engineering and Services Co Ltd
Hitachi Ltd
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Description

本発明は、２重燃料焚きガスタービンの燃料供給系に関する。   The present invention relates to a fuel supply system for a dual fuel-fired gas turbine.

２重燃料焚きガスタービンではガスタービン燃料として合成ガス燃料および液体燃料が使用される。合成ガス燃料とパージ空気とが直接接触することを防ぐため特許文献１に記載のように不活性ガスが用いられる。 In a dual fuel-fired gas turbine, syngas fuel and liquid fuel are used as gas turbine fuel. In order to prevent direct contact between the synthesis gas fuel and the purge air, an inert gas is used as described in Patent Document 1.

この特許文献１では、通常運転時に、ガスタービン燃料として合成ガス燃料を使用し、ガスタービンの起動，試運転およびガス燃料供給系のトラブル時に液体燃料を使用する。さらに、合成ガス燃料を使用できる運転条件が確立されてから液体燃料と合成ガス燃料との燃料切り替えを行っている。また、ガスタービン停止もガス燃料から液体燃料に切替えてから運転を停止させるようになっている。   In Patent Document 1, syngas fuel is used as gas turbine fuel during normal operation, and liquid fuel is used during gas turbine start-up, trial operation, and troubles in the gas fuel supply system. Furthermore, after the operating condition that can use the syngas fuel is established, the fuel is switched between the liquid fuel and the syngas fuel. Also, the operation of the gas turbine is stopped after switching from gas fuel to liquid fuel.

特許文献１では、合成ガス燃料にて専焼の時、ガス燃料供給系の補助燃料供給弁，燃料供給弁，燃料遮断弁，燃料流量調節弁は開いており、ガス燃料はこれらの弁を通ってガスタービン燃焼器の燃料ノズルに供給される。ガス燃料はパージ供給空気系の空気供給弁の下流側で遮断される。また、空気供給系の空気案内弁，空気供給弁ともに閉じられ、パージ空気は空気案内弁の上流側で遮断される。一方空気案内弁と空気供給弁の間に不活性ガスが満たされている。   In Patent Document 1, when the synthesis gas fuel is exclusively burned, the auxiliary fuel supply valve, the fuel supply valve, the fuel cutoff valve, and the fuel flow control valve of the gas fuel supply system are open, and the gas fuel passes through these valves. It is supplied to the fuel nozzle of the gas turbine combustor. Gas fuel is shut off downstream of the air supply valve of the purge supply air system. Further, both the air guide valve and the air supply valve of the air supply system are closed, and the purge air is shut off upstream of the air guide valve. On the other hand, an inert gas is filled between the air guide valve and the air supply valve.

このように合成ガス燃料と高温パージ空気の間に不活性ガスを挟むことによって合成ガス燃料と高温パージ空気とが直接接触することを防いでいる。   As described above, the inert gas is sandwiched between the synthesis gas fuel and the high temperature purge air to prevent the synthesis gas fuel and the high temperature purge air from coming into direct contact with each other.

特開２００２−１２９９８１号公報JP 2002-129981 A

ところが、このようなガスタービン燃料供給系では、パージ空気供給系の空気案内弁，空気供給弁および大気放出弁によるそれぞれ、パージ空気，ガス燃料および不活性ガスの漏れを考える必要がある。   However, in such a gas turbine fuel supply system, it is necessary to consider leakage of purge air, gas fuel, and inert gas by the air guide valve, air supply valve, and atmospheric discharge valve of the purge air supply system, respectively.

パージ空気供給系により供給されるパージ空気は高温高圧であるため、パージ空気供給系の空気供給弁および空気案内弁は高温および高圧に耐える弁となる。しかし、仮にこのような弁のガス漏れを考えた場合、ガスタービンが合成ガス燃料にて専焼の時、合成ガス燃料系の燃料流量調節弁およびパージ空気供給系の空気供給弁の間に満たされている合成ガス燃料は空気供給弁から漏れ、空気供給系の空気案内弁で遮断されている空気は空気案内弁から漏れることにより、空気供給弁と空気案内弁の間で混合する可能性がある。また、大気に放出されている大気放出弁の漏れにより、空気供給弁と空気案内弁の間の圧力が警報限界の圧力でありながら不活性ガス濃度がさがった状態で、空気供給弁から漏れた合成ガス燃料と空気案内弁から漏れた空気が混合する可能性がある。 Since the purge air supplied by the purge air supply system has high temperature and high pressure, the air supply valve and the air guide valve of the purge air supply system are valves that can withstand high temperatures and high pressures. However, if the gas leakage of such a valve is considered, when the gas turbine is exclusively burned with synthesis gas fuel, it is filled between the fuel flow control valve of the synthesis gas fuel system and the air supply valve of the purge air supply system. syngas fuels has leaked from the air supply valve, the air is blocked by the air guiding valve of the air supply system by leaking from the air guide valve, there is a possibility of mixing between the air supply valve and the air guide valve . In addition, leakage from the air supply valve leaked from the air supply valve in a state where the inert gas concentration was reduced while the pressure between the air supply valve and the air guide valve was the alarm limit pressure due to the leakage of the air release valve being released to the atmosphere. Syngas fuel and air leaking from the air guide valve may mix .

パージ空気供給系において、空気供給弁と空気案内弁との間の不活性ガスの圧力が仮に低下した場合不活性ガス補給する必要があるが、不活性ガス供給系が無いためガスタービンの連続運転ができなくなる。
In the purge air supply system, if the pressure of the inert gas between the air supply valve and the air guide valve drops, it is necessary to replenish the inert gas. However, since there is no inert gas supply system, the gas turbine is continuously operated. Can not be.

また、通常運転時に合成ガスを燃料とするガスタービン燃料供給系において、不活性ガスを連続的に補充することは経済的にも困難である。   In addition, it is economically difficult to continuously replenish the inert gas in a gas turbine fuel supply system that uses synthesis gas as fuel during normal operation.

本発明の目的は、各弁の漏れを考慮した、合成ガス燃料とパージ用空気とが直接接触することを防ぐことが可能なガスタービン燃料供給系を提供することにある。また、本発明の他の目的は、上記に加えて、連続的な運転が可能なガスタービンの燃料供給系を提供することである。   An object of the present invention is to provide a gas turbine fuel supply system that can prevent direct contact between synthesis gas fuel and purge air in consideration of leakage of each valve. In addition to the above, another object of the present invention is to provide a fuel supply system for a gas turbine capable of continuous operation.

本発明のガス燃料と液体燃料を切り替えてガスタービン燃焼器へ燃料を供給するガスタービン燃料供給は、前記ガス燃料にて専焼の時、及び、ガス燃料から液体燃料に切り替える時、ガス燃料を供給するガス燃料供給系において、ガス燃料遮断弁およびガス燃料圧力調節弁さらにガス燃料流量調節弁を介してガスタービン燃焼器のガス燃料ノズルにガス燃料を供給するガス燃料供給系と、前記ガス燃料ノズルへのガス燃料供給が停止され、前記液体燃料にて専焼の時、及び、液体燃料から前記ガス燃料に切り替える時、液体燃料を供給する液体燃料供給系において、液体燃料遮断弁および液体燃料流量調節弁を備えた液体燃料ポンプさらに液体燃料分流器を介してガスタービン燃焼器の液体燃料ノズルに液体燃料を供給する液体燃料供給系と、前記ガス燃料ノズルと前記ガス燃料流量調節弁との間にパージ空気を供給するパージ空気供給系と前記ガス燃料流量調節弁と前記ガス燃料圧力調節弁の間にパージ用不活性ガスを供給する不活性ガス供給系を備えたことを特徴とする。   According to the present invention, the gas turbine fuel supply for supplying gas fuel to the gas turbine combustor by switching between the gas fuel and the liquid fuel is supplied when the gas fuel is exclusively burned and when the gas fuel is switched to the liquid fuel. A gas fuel supply system for supplying gas fuel to a gas fuel nozzle of a gas turbine combustor via a gas fuel shut-off valve, a gas fuel pressure control valve, and a gas fuel flow rate control valve, and the gas fuel nozzle When the liquid fuel supply to the liquid fuel supply system for supplying liquid fuel is stopped when the liquid fuel supply is stopped and the liquid fuel is exclusively burned or when the liquid fuel is switched to the gas fuel, the liquid fuel shutoff valve and the liquid fuel flow rate adjustment are performed. A liquid fuel supply system for supplying liquid fuel to a liquid fuel nozzle of a gas turbine combustor through a liquid fuel pump having a valve and a liquid fuel shunt; A purge air supply system that supplies purge air between the gas fuel nozzle and the gas fuel flow control valve, and a purge inert gas that supplies purge gas between the gas fuel flow control valve and the gas fuel pressure control valve. An active gas supply system is provided.

さらに、本発明のガスタービン燃料供給系は、パージ空気を供給するパージ空気供給系は、パージ空気案内弁およびパージ空気供給弁の間に補助パージ空気供給弁を備えたことを特徴とする。この特徴は、前述の特徴と組み合わせ以外に単独でも用いることができる。   Furthermore, the gas turbine fuel supply system of the present invention is characterized in that the purge air supply system for supplying purge air includes an auxiliary purge air supply valve between the purge air guide valve and the purge air supply valve. This feature can be used alone in addition to the above-described features and combinations.

また、さらに、本発明のガスタービン燃料供給系は、パージ空気供給系において前記パージ空気案内弁と前記補助パージ空気供給弁の間および、前記補助パージ空気供給弁と前記パージ空気供給弁の間に大気放出弁を備えたことを特徴とする。   Further, the gas turbine fuel supply system according to the present invention includes a purge air supply system between the purge air guide valve and the auxiliary purge air supply valve and between the auxiliary purge air supply valve and the purge air supply valve. An atmospheric release valve is provided.

また、さらに、本発明のガスタービン燃料供給系は、前記不活性ガス供給系は、液体燃料にて専焼の時、前記ガス燃料流量調節弁と前記ガス燃料遮断弁の間の不活性ガス圧力を一定に保つように不活性ガスを補充できることを特徴とする。   Furthermore, the gas turbine fuel supply system according to the present invention is configured such that the inert gas pressure between the gas fuel flow control valve and the gas fuel shut-off valve is reduced when the inert gas supply system is exclusively burned with liquid fuel. An inert gas can be replenished so as to keep it constant.

以下、本発明の実施例を図面を用いて説明する。図１は、本発明の第１の実施例に係わるガスタービン燃料供給系の系統図である。   Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a system diagram of a gas turbine fuel supply system according to a first embodiment of the present invention.

ガス燃料は、ガス燃料供給系１５のガス燃料遮断弁２４，ガス燃料圧力調節弁５１およびガス燃料流量調節弁２９を通ってガスタービン燃焼器１３のガス燃料ノズル１４に供給される。ガス燃料遮断弁２４とガス燃料圧力調節弁５１の間には、大気放出弁２５ｃとガス分析器２７ｃから構成される大気放出系２６ｃおよび圧力スイッチ２８ｃが設けられ、ガス燃料圧力調節弁５１とガス燃料流量調節弁２９の間には、大気放出弁２５ａとガス分析器２７ａから構成される大気放出系２６ａおよび圧力スイッチ２８ａが設けられている。   The gas fuel is supplied to the gas fuel nozzle 14 of the gas turbine combustor 13 through the gas fuel cutoff valve 24, the gas fuel pressure adjustment valve 51, and the gas fuel flow rate adjustment valve 29 of the gas fuel supply system 15. Between the gas fuel shut-off valve 24 and the gas fuel pressure control valve 51, there are provided an air release system 26c and a pressure switch 28c composed of an air release valve 25c and a gas analyzer 27c. Between the fuel flow control valve 29, an atmospheric discharge system 26a and a pressure switch 28a each including an atmospheric discharge valve 25a and a gas analyzer 27a are provided.

一方、液体燃料は、液体燃料供給系４１の液体燃料遮断弁４２，液体燃料流量調節弁
４４を備えた液体燃料ポンプ４３さらに液体燃料分流器４５を通ってガスタービン燃焼器１３の液体燃料ノズル４７に供給される。 On the other hand, the liquid fuel passes through the liquid fuel pump 43 having the liquid fuel shutoff valve 42 and the liquid fuel flow control valve 44 of the liquid fuel supply system 41, and further through the liquid fuel diverter 45, and the liquid fuel nozzle 47 of the gas turbine combustor 13. To be supplied.

パージ空気供給系１６はパージ用空気を供給するものである。ガスタービンの液体燃料焚き時パージ用空気は、パージ空気案内弁３０，補助パージ空気供給弁３１およびパージ空気供給弁３２を通ってガス燃料流量調節弁２９とガス燃料ノズル１４の間に供給される。パージ空気供給系１６のパージ空気案内弁３０と補助パージ空気供給弁３１の間には、大気放出弁２５ｄとガス分析器２７ｄから構成される大気放出系２６ｄおよび圧力スイッチ２８ｄが設けられる。補助パージ空気供給弁３１およびパージ空気供給弁３２の間には、大気放出弁２５ｂとガス分析器２７ｂから構成される大気放出系２６ｂおよび圧力スイッチ２８ｂが設けられている。   The purge air supply system 16 supplies purge air. Purge air when the gas fuel is burned in the gas turbine is supplied between the gas fuel flow control valve 29 and the gas fuel nozzle 14 through the purge air guide valve 30, the auxiliary purge air supply valve 31 and the purge air supply valve 32. . Between the purge air guide valve 30 and the auxiliary purge air supply valve 31 of the purge air supply system 16, an atmospheric discharge system 26d and a pressure switch 28d each including an atmospheric discharge valve 25d and a gas analyzer 27d are provided. Between the auxiliary purge air supply valve 31 and the purge air supply valve 32, an atmospheric discharge system 26b and a pressure switch 28b each including an atmospheric discharge valve 25b and a gas analyzer 27b are provided.

不活性ガス供給系１７は、不活性ガスを供給するものである。不活性ガスは、不活性ガス圧力調節弁３４およびパージ弁３３を通ってガス燃料供給系１５のガス燃料圧力調節弁５１およびガス燃料流量調節弁２９の間の配管に供給され、不活性ガス圧力調節弁３４およびパージ弁３５を通ってガス燃料流量調節弁２９およびガスタービン燃焼器１３のガス燃料ノズル１４の間の配管に供給される。不活性ガス供給系１７の不活性ガス圧力調節弁３４とパージ弁３３およびパージ弁３５の間には、不活性ガス圧力を検出する圧力スイッチ３６および不活性ガス流量を検出する流量計３７が設けられている。   The inert gas supply system 17 supplies an inert gas. The inert gas is supplied to the pipe between the gas fuel pressure control valve 51 and the gas fuel flow rate control valve 29 of the gas fuel supply system 15 through the inert gas pressure control valve 34 and the purge valve 33, and the inert gas pressure. The gas is supplied to a pipe between the gas fuel flow rate adjusting valve 29 and the gas fuel nozzle 14 of the gas turbine combustor 13 through the control valve 34 and the purge valve 35. Between the inert gas pressure control valve 34 of the inert gas supply system 17 and the purge valve 33 and the purge valve 35, a pressure switch 36 for detecting the inert gas pressure and a flow meter 37 for detecting the inert gas flow rate are provided. It has been.

いま、図１で示すように、ガスタービンが液体燃料で運転されているとすると、液体燃料供給系４１の液体燃料遮断弁４２，液体燃料流量調節弁４４は開いており、液体燃料ポンプ４３から液体燃料分流器４５を通ってガスタービン燃焼器１３，液体燃料ノズル４７に供給される。一方、ガス燃料供給系１５のガス燃料遮断弁２４，ガス燃料圧力調節弁
５１およびガス燃料流量調節弁２９は閉じており、ガス燃料はガス燃料遮断弁２４の上流側まで来ていることになる。 As shown in FIG. 1, if the gas turbine is operated with liquid fuel, the liquid fuel shutoff valve 42 and the liquid fuel flow rate adjustment valve 44 of the liquid fuel supply system 41 are open, and the liquid fuel pump 43 It is supplied to the gas turbine combustor 13 and the liquid fuel nozzle 47 through the liquid fuel diverter 45. On the other hand, the gas fuel shutoff valve 24, the gas fuel pressure control valve 51, and the gas fuel flow rate control valve 29 of the gas fuel supply system 15 are closed, and the gas fuel has reached the upstream side of the gas fuel shutoff valve 24. .

パージ空気供給系１６のパージ空気案内弁３０，補助パージ空気供給弁３１およびパージ空気供給弁３２が開いており、パージ空気はガス燃料流量調節弁２９とガスタービン燃焼器１３のガス燃料ノズル１４の間に供給されている。   The purge air guide valve 30, the auxiliary purge air supply valve 31 and the purge air supply valve 32 of the purge air supply system 16 are open, and the purge air is supplied to the gas fuel flow rate adjusting valve 29 and the gas fuel nozzle 14 of the gas turbine combustor 13. Supplied in between.

不活性ガス供給系１７の不活性ガス圧力調節弁３４およびパージ弁３３は開いており、不活性ガスがガス燃料供給系１５のガス燃料圧力調節弁５１およびガス燃料流量調節弁
２９の間の配管に供給される。この場合、一旦大気放出系２６ａの大気放出弁２５ａ開けられ、ガス分析器２７ａによりガス燃料圧力調節弁５１およびガス燃料流量調節弁２９の間に残っていたガス燃料が不活性ガスによって置換されたことを確認し、これが完了すると大気放出弁２５ａを閉じる。 The inert gas pressure control valve 34 and the purge valve 33 of the inert gas supply system 17 are open, and the inert gas is connected to the gas fuel pressure control valve 51 and the gas fuel flow rate control valve 29 of the gas fuel supply system 15. To be supplied. In this case, the atmosphere release valve 25a of the atmosphere release system 26a is once opened, and the gas fuel remaining between the gas fuel pressure control valve 51 and the gas fuel flow control valve 29 is replaced by the inert gas by the gas analyzer 27a. When this is completed, the atmospheric discharge valve 25a is closed.

圧力スイッチ２８ａはガス燃料圧力調節弁５１およびガス燃料流量調節弁２９の間の圧力を検知し、不活性ガスの圧力が低下したときは不活性ガスが漏れたと判断する。この場合、不活性ガス供給系１７の不活性ガス圧力調節弁３４を調整することによりガス燃料圧力調節弁５１およびガス燃料流量調節弁２９の間の不活性ガスが補充される。また、大気放出弁２５ｃのガス分析器２７ｃによりガス燃料供給系１５のガス燃料遮断弁２４からガス燃料が漏れているか否かを確認し、ガス燃料が漏れた場合警報を発する。   The pressure switch 28a detects the pressure between the gas fuel pressure control valve 51 and the gas fuel flow control valve 29, and determines that the inert gas has leaked when the pressure of the inert gas decreases. In this case, the inert gas between the gas fuel pressure control valve 51 and the gas fuel flow control valve 29 is replenished by adjusting the inert gas pressure control valve 34 of the inert gas supply system 17. In addition, the gas analyzer 27c of the atmospheric release valve 25c checks whether or not the gas fuel is leaking from the gas fuel shutoff valve 24 of the gas fuel supply system 15, and issues an alarm if the gas fuel leaks.

不活性ガス供給系１７の圧力スイッチ３６も、圧力スイッチ２８ａの同様な機能を有する。図１の状態、つまりガスタービンが液体燃料にて専焼のとき、ガス燃料と高温パージ空気との間に不活性ガスを挟むことにより、ガス燃料と高温パージ空気が混合し爆発するのを防いでいる。   The pressure switch 36 of the inert gas supply system 17 has the same function as the pressure switch 28a. In the state shown in FIG. 1, that is, when the gas turbine is exclusively burned with liquid fuel, an inert gas is sandwiched between the gas fuel and the high temperature purge air to prevent the gas fuel and the high temperature purge air from mixing and exploding. Yes.

次に、液体燃料運転からガス燃料運転への切り替えについて説明する。図２は液体燃料運転からガス燃料運転への切り替えの開始時のガスタービン燃料供給系を表している。ここで、パージ空気供給系１６のパージ空気案内弁３０，補助パージ空気供給弁３１およびパージ空気供給弁３２が閉じており、ガス燃料供給系１５のガス燃料圧力調節弁５１とガス燃料流量調節弁２９および、不活性ガス供給系１７のパージ弁３３は開いている。   Next, switching from liquid fuel operation to gas fuel operation will be described. FIG. 2 shows a gas turbine fuel supply system at the start of switching from liquid fuel operation to gas fuel operation. Here, the purge air guide valve 30, the auxiliary purge air supply valve 31 and the purge air supply valve 32 of the purge air supply system 16 are closed, and the gas fuel pressure control valve 51 and the gas fuel flow rate control valve of the gas fuel supply system 15 are closed. 29 and the purge valve 33 of the inert gas supply system 17 are open.

液体燃料運転中は、パージ空気供給系１６により、ガス燃料供給系１５のガス燃料流量調節弁２９とガス燃料ノズル１４の間にパージ空気が満たされているため、パージ空気供給系１６のパージ空気案内弁３０，補助パージ空気供給弁３１およびパージ空気供給弁
３２を閉じてパージ空気を遮断する。 During operation of the liquid fuel, the purge air is filled between the gas fuel flow control valve 29 of the gas fuel supply system 15 and the gas fuel nozzle 14 by the purge air supply system 16. The guide valve 30, the auxiliary purge air supply valve 31, and the purge air supply valve 32 are closed to shut off the purge air.

次に、不活性ガス供給系１７のパージ弁３５およびガス燃料供給系１５のガス燃料圧力調節弁５１とガス燃料流量調節弁２９を開いて、不活性ガスをガス燃料遮断弁２４までの配管区間に満たされる。この場合、大気放出系２６ｃの大気放出弁２５ｃを一旦開いて、ガス分析器２７ｃによりガス燃料供給系１５のガス燃料圧力調節弁５１とガス燃料遮断弁２４の間に不活性ガスが充満されたか否かを確認を行い、確認できたときは大気放出弁
２５ｃを閉じる。大気放出系２６ｃの大気放出弁２５ｃが閉じた状態を図３で示している。 Next, the purge valve 35 of the inert gas supply system 17, the gas fuel pressure control valve 51 of the gas fuel supply system 15, and the gas fuel flow control valve 29 are opened, and the inert gas is connected to the gas fuel cutoff valve 24. Is satisfied. In this case, the atmosphere release valve 25c of the atmosphere release system 26c is once opened, and an inert gas is filled between the gas fuel pressure control valve 51 and the gas fuel cutoff valve 24 of the gas fuel supply system 15 by the gas analyzer 27c. It is confirmed whether or not, and when it is confirmed, the atmospheric discharge valve 25c is closed. FIG. 3 shows a state where the air release valve 25c of the air release system 26c is closed.

この状態でも、ガスタービンは液体燃料にて運転しているため、液体燃料供給系４１の液体燃料遮断弁４２，液体燃料流量調節弁４４は開いており、液体燃料は液体燃料ポンプ４３から液体燃料分流器４５を通ってガスタービン燃焼器１３の液体燃料ノズル４７に供給される。またガス燃料供給系のガス燃料遮断弁２４は閉じておりガス燃料はガス燃料遮断弁２４の上流側まで来ている状態である。   Even in this state, since the gas turbine is operated with liquid fuel, the liquid fuel shutoff valve 42 and the liquid fuel flow rate adjustment valve 44 of the liquid fuel supply system 41 are open, and the liquid fuel is supplied from the liquid fuel pump 43 to the liquid fuel. The gas is supplied to the liquid fuel nozzle 47 of the gas turbine combustor 13 through the flow divider 45. Further, the gas fuel shutoff valve 24 of the gas fuel supply system is closed, and the gas fuel is in a state of reaching the upstream side of the gas fuel shutoff valve 24.

次に、図３に示すように、パージ空気供給系１６のパージ空気供給弁３２，補助パージ空気供給弁３１および大気放出系２６ｄの大気放出弁２５ｄを開く。大気放出系２６ｄのガス分析器２７ｄによりパージ空気供給系１６のパージ空気案内弁３０と補助パージ空気供給弁３１の間に不活性ガスの確認を行い、確認できたときは補助パージ空気供給弁３１を閉じる。次に、大気放出系２６ｂの大気放出弁２５ｂを開いて、ガス分析器２７ｂによりパージ空気供給系１６のパージ空気供給弁３２と補助パージ空気供給弁３１との間に不活性ガスの確認を行い、確認できたときはパージ空気供給弁３２を閉じる。パージ空気供給系１６のパージ空気供給弁３２および補助パージ空気供給弁３１が閉じた状態を図４で示している。   Next, as shown in FIG. 3, the purge air supply valve 32 of the purge air supply system 16, the auxiliary purge air supply valve 31, and the atmospheric discharge valve 25d of the atmospheric discharge system 26d are opened. The inert gas is checked between the purge air guide valve 30 of the purge air supply system 16 and the auxiliary purge air supply valve 31 by the gas analyzer 27d of the atmospheric discharge system 26d, and when it is confirmed, the auxiliary purge air supply valve 31 is checked. Close. Next, the atmospheric release valve 25b of the atmospheric release system 26b is opened, and an inert gas is confirmed between the purge air supply valve 32 and the auxiliary purge air supply valve 31 of the purge air supply system 16 by the gas analyzer 27b. When it is confirmed, the purge air supply valve 32 is closed. FIG. 4 shows a state in which the purge air supply valve 32 and the auxiliary purge air supply valve 31 of the purge air supply system 16 are closed.

図３の状態で、ガス燃料はガス燃料供給系１５のガス燃料遮断弁２４の上流側まで、パージ空気はパージ空気供給系１６のパージ空気案内弁３０の上流側まで、不活性ガスはガス燃料供給系１５のガス燃料遮断弁２４の下流側とパージ空気供給系１６のパージ空気案内弁３０の下流側まで来ている。   In the state of FIG. 3, the gas fuel is upstream of the gas fuel cutoff valve 24 of the gas fuel supply system 15, the purge air is upstream of the purge air guide valve 30 of the purge air supply system 16, and the inert gas is gas fuel. The gas fuel shut-off valve 24 of the supply system 15 and the purge air guide valve 30 of the purge air supply system 16 reach the downstream side.

図４で示すように、不活性ガス供給系１７の不活性ガス圧力調節弁３４，パージ弁３５およびパージ弁３３を閉じ、ガス燃料供給系１５のガス燃料遮断弁を開く。次に、液体燃料供給系４１の液体燃料遮断弁４２，液体燃料流量調節弁４４を閉じ、液体燃料供給を遮断する。   As shown in FIG. 4, the inert gas pressure control valve 34, the purge valve 35, and the purge valve 33 of the inert gas supply system 17 are closed, and the gas fuel cutoff valve of the gas fuel supply system 15 is opened. Next, the liquid fuel cutoff valve 42 and the liquid fuel flow rate adjustment valve 44 of the liquid fuel supply system 41 are closed to shut off the liquid fuel supply.

燃料切り替えが完了すると、図５に示すように、ガス燃料での運転となる。   When the fuel switching is completed, operation with gas fuel is performed as shown in FIG.

ここで、大気放出系２６ｄの大気放出弁２５ｄを開くおよび大気放出系２６ｂの大気放出弁２５ｂを開き大気に開放されているため、パージ空気供給系１６のパージ空気案内弁３０と補助パージ空気供給弁３１との間の圧力とパージ空気供給系１６の補助パージ空気供給弁３１とパージ空気供給弁３２との間の圧力が大気圧に等しい。そのため、パージ空気供給系１６のパージ空気供給弁３２まで来ているガス燃料と同じパージ空気供給系１６のパージ空気案内弁３０まで来ているパージ用空気が直接接触することがない。従って、合成ガス燃料と高温パージ用空気とが直接接触して爆発するのを防ぐことができる。   Here, since the atmosphere release valve 25d of the atmosphere release system 26d and the atmosphere release valve 25b of the atmosphere release system 26b are opened and opened to the atmosphere, the purge air guide valve 30 and the auxiliary purge air supply of the purge air supply system 16 are opened. The pressure between the valve 31 and the pressure between the auxiliary purge air supply valve 31 and the purge air supply valve 32 of the purge air supply system 16 are equal to the atmospheric pressure. Therefore, the purge air coming to the purge air guide valve 30 of the same purge air supply system 16 as the gas fuel coming to the purge air supply valve 32 of the purge air supply system 16 is not in direct contact. Therefore, it is possible to prevent the synthesis gas fuel and the high temperature purge air from coming into direct contact and exploding.

以上に述べたように、本発明によれば、ガス燃料を使用するガスタービンの燃料供給系において、ガス燃料と高温パージ用空気との間に圧力差の小さい領域を設けることにより、ガスと高温パージ用空気が漏れて直接接触するのを防ぐことが可能となる。   As described above, according to the present invention, in a fuel supply system of a gas turbine that uses gas fuel, by providing a region with a small pressure difference between the gas fuel and the high temperature purge air, It becomes possible to prevent the purge air from leaking and coming into direct contact.

また、ガス燃料と高温パージ用空気とが直接接触しないようにパージするため、不活性ガスを用いないことから不活性ガスの補給が不要となりガスタービンの連続運転が可能となる。   Further, since the purging is performed so that the gas fuel and the high temperature purge air are not in direct contact with each other, no inert gas is replenished and the gas turbine can be continuously operated because no inert gas is used.

本発明の実施の形態に係る液体燃料によるガスタービン運転時のガスタービン燃料供給系の系統図。The system diagram of the gas turbine fuel supply system at the time of the gas turbine operation | movement by the liquid fuel which concerns on embodiment of this invention. 本発明の実施の形態に係る液体燃料による運転からガス燃料による運転への切り替え開始時のガスタービン燃料供給系の系統図。1 is a system diagram of a gas turbine fuel supply system at the start of switching from operation using liquid fuel to operation using gas fuel according to an embodiment of the present invention. 本発明の実施の形態に係る液体燃料による運転からガス燃料による運転への切り替えの際、ガス燃料とパージ空気を不活性ガスで置き換える場合のガスタービン燃料供給系の系統図。FIG. 3 is a system diagram of a gas turbine fuel supply system when gas fuel and purge air are replaced with inert gas when switching from operation using liquid fuel to operation using gas fuel according to the embodiment of the present invention. 本発明の実施の形態に係る液体燃料による運転からガス燃料による運転への切り替えの際、液体燃料とガス燃料両方による運転状態のガスタービン燃料供給系の系統図。1 is a system diagram of a gas turbine fuel supply system in an operating state using both liquid fuel and gas fuel when switching from operation using liquid fuel to operation using gas fuel according to an embodiment of the present invention. 本発明の実施の形態に係るガス燃料によるガスタービン運転時のガスタービン燃料供給系の系統図。The system diagram of the gas turbine fuel supply system at the time of the gas turbine operation | movement by the gas fuel which concerns on embodiment of this invention.

符号の説明Explanation of symbols

13…ガスタービン燃焼器、１４…ガス燃料ノズル、１５…ガス燃料供給系、１６…パージ空気供給系、１７…不活性ガス供給系、２３…ガス燃料供給弁、２４…ガス燃料遮断弁、２５ａ，２５ｂ，２５ｃ，２５ｄ…大気放出弁、２６ａ，２６ｂ，２６ｃ，２６ｄ…大気放出系、２７ａ，２７ｂ，２７ｃ，２７ｄ…ガス分析器、２８ａ，２８ｂ，２８ｃ，
２８ｄ，３６…圧力スイッチ、２９…ガス燃料流量調節弁、３０…パージ空気案内弁、
３１…補助パージ空気供給弁、３２…パージ空気供給弁、３３，３５…パージ弁、３４…不活性ガス圧力調節弁、３７…流量計、４１…液体燃料供給系、４２…液体燃料遮断弁、４３…液体燃料ポンプ、４４…液体燃料流量調節弁、４５…液体燃料分流器、４７…液体燃料ノズル、５１…ガス燃料圧力調節弁。

13 ... Gas turbine combustor, 14 ... Gas fuel nozzle, 15 ... Gas fuel supply system, 16 ... Purge air supply system, 17 ... Inert gas supply system, 23 ... Gas fuel supply valve, 24 ... Gas fuel cutoff valve, 25a 25b, 25c, 25d ... atmospheric release valve, 26a, 26b, 26c, 26d ... atmospheric release system, 27a, 27b, 27c, 27d ... gas analyzer, 28a, 28b, 28c,
28d, 36 ... pressure switch, 29 ... gas fuel flow control valve, 30 ... purge air guide valve,
31 ... Auxiliary purge air supply valve, 32 ... Purge air supply valve, 33, 35 ... Purge valve, 34 ... Inert gas pressure control valve, 37 ... Flow meter, 41 ... Liquid fuel supply system, 42 ... Liquid fuel cutoff valve, DESCRIPTION OF SYMBOLS 43 ... Liquid fuel pump, 44 ... Liquid fuel flow control valve, 45 ... Liquid fuel shunt, 47 ... Liquid fuel nozzle, 51 ... Gas fuel pressure control valve.

Claims (2)

ガス燃料および液体燃料の２重燃料焚きガスタービンの燃料供給系であって、ガス燃料遮断弁およびガス燃料圧力調節弁，ガス燃料流量調節弁を介してガスタービン燃焼器のガス燃料ノズルにガス燃料を供給するガス燃料供給系と、ガスタービン燃焼器の液体燃料ノズルに液体燃料を供給する液体燃料供給系と、前記ガス燃料ノズルと前記ガス燃料流量調節弁との間にパージ空気を供給するパージ空気供給系と、前記ガス燃料流量調節弁と前記ガス燃料圧力調節弁の間にパージ用不活性ガスを供給する不活性ガス供給系を備え、
前記パージ空気供給系は、パージ空気案内弁，パージ空気供給弁及び前記パージ空気案内弁と前記パージ空気供給弁との間に設けられた補助パージ空気供給弁を備え、
前記パージ空気案内弁と前記補助パージ空気供給弁の間および、前記補助パージ空気供給弁と前記パージ空気供給弁の間に、大気放出弁を備えた大気放出系（２６ｄ，２６ｂ）がそれぞれ設けられ、
前記ガス燃料供給系からのガス燃料での運転時、前記パージ空気案内弁，前記パージ空気供給弁及び前記補助パージ空気供給弁を閉じ、前記大気放出系（２６ｄ及び２６ｂ）の大気放出弁を開とするようにしたことを特徴とする２重燃料焚きガスタービン燃料供給系。 A fuel supply system for a dual-fired gas turbine of gas fuel and liquid fuel , which is supplied to a gas fuel nozzle of a gas turbine combustor via a gas fuel shut-off valve, a gas fuel pressure control valve, and a gas fuel flow control valve A gas fuel supply system, a liquid fuel supply system for supplying liquid fuel to a liquid fuel nozzle of a gas turbine combustor, and a purge for supplying purge air between the gas fuel nozzle and the gas fuel flow control valve An air supply system, and an inert gas supply system for supplying an inert gas for purge between the gas fuel flow control valve and the gas fuel pressure control valve ,
The purge air supply system includes a purge air guide valve, a purge air supply valve, and an auxiliary purge air supply valve provided between the purge air guide valve and the purge air supply valve,
An atmospheric discharge system (26d, 26b) having an atmospheric discharge valve is provided between the purge air guide valve and the auxiliary purge air supply valve and between the auxiliary purge air supply valve and the purge air supply valve. ,
During operation with gas fuel from the gas fuel supply system, the purge air guide valve, the purge air supply valve, and the auxiliary purge air supply valve are closed, and the atmospheric discharge valve of the atmospheric discharge system (26d and 26b) is opened. A dual fuel-fired gas turbine fuel supply system characterized by the above . 前記ガス燃料遮断弁と前記ガス燃料圧力調節弁との間に大気放出弁を備えた大気放出系（２６ｃ）を設け、
液体燃料にて専焼の時、前記ガス燃料遮断弁，前記ガス燃料圧力調節弁及び前記ガス燃料流量調節弁を閉じ、前記大気放出系（２６ｃ）の大気放出弁を開とし、前記不活性ガス供給系は、前記ガス燃料圧力調節弁と前記ガス燃料流量調節弁の間の不活性ガス圧力を所定に保つように不活性ガスを補充するようにしたことを特徴とする請求項１に記載の２重燃料焚きガスタービン燃料供給系。 An atmospheric release system (26c) having an atmospheric release valve is provided between the gas fuel cutoff valve and the gas fuel pressure control valve,
When burning exclusively with liquid fuel, the gas fuel shut-off valve, the gas fuel pressure control valve, and the gas fuel flow rate control valve are closed, the atmospheric discharge valve of the atmospheric discharge system (26c) is opened, and the inert gas supply is performed. system, 2 according to claim 1, characterized in that so as to replenish the inert gas so as to keep the inert gas pressure to a predetermined between the gas fuel pressure regulating valve the gas fuel flow rate control valve Heavy fuel-fired gas turbine fuel supply system.
JP2003334499A 2003-09-26 2003-09-26 Double fuel-fired gas turbine fuel supply system Expired - Fee Related JP4130909B2 (en)

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JP4115659B2 (en) * 2000-10-30 2008-07-09 株式会社東芝 Gas turbine fuel supply system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101995033A (en) * 2009-08-12 2011-03-30 通用电气公司 Methods and systems for dry low NOx combustion systems
CN104357646A (en) * 2014-09-23 2015-02-18 宁波宝新不锈钢有限公司 Dual-fuel online fast switch device for annealing furnace

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