JP2014111912A - Denitrification processing apparatus for exhaust gas and method - Google Patents

Denitrification processing apparatus for exhaust gas and method Download PDF

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JP2014111912A
JP2014111912A JP2012266450A JP2012266450A JP2014111912A JP 2014111912 A JP2014111912 A JP 2014111912A JP 2012266450 A JP2012266450 A JP 2012266450A JP 2012266450 A JP2012266450 A JP 2012266450A JP 2014111912 A JP2014111912 A JP 2014111912A
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exhaust gas
duct
air
denitration
dilution air
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JP5725478B2 (en
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Ryota Ochiai
亮太 落合
Kiyotaka Takeuchi
清高 竹内
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Mitsubishi Power Ltd
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Babcock Hitachi KK
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Abstract

PROBLEM TO BE SOLVED: To provide a denitrification processing apparatus and method for performing denitrification processing on high-temperature exhaust gas of a gas turbine in which an exhaust heat recovery boiler is not installed.SOLUTION: In a denitrification apparatus for high-temperature exhaust gas, a denitrification reactor 4 for ammonia catalytic reduction, an air fan 6 for cooling exhaust gas by introducing air to a front flow side of the denitrification reactor 4 and a mixing foil 1 as a mixer for mixing air introduced into a gas turbine exhaust gas duct 12 by the air fan 6 with exhaust gas are disposed in the exhaust gas duct 12. A check damper 8 for high-temperature exhaust gas back flow prevention is disposed in the exhaust gas duct at a front flow side of the mixing foil 1, and a seal air fan 7 for blowing air for sealing is provided between the check damper 8 and the mixing foil 1.

Description

本発明は、ガスタービンから排出される高温排ガスの脱硝処理装置と方法に係り、特に高温排ガス冷却用として排ガス希釈用空気を混入することが可能な高温排ガスの脱硝処理をする装置と方法に関する。   The present invention relates to a denitration treatment apparatus and method for high-temperature exhaust gas discharged from a gas turbine, and more particularly to an apparatus and method for denitration treatment of high-temperature exhaust gas capable of mixing exhaust gas dilution air for cooling high-temperature exhaust gas.

ガスタービンから排出される高温排ガスの脱硝装置として、大気を吸引もしくは加圧して導入し、排ガスと混合させる混合器を設け、排ガス温度を使用する脱硝触媒の脱硝効率の高い温度範囲に冷却制御する高温排ガス脱硝装置が特開平4−4021号公報などで知られている。   As a denitration device for high-temperature exhaust gas discharged from a gas turbine, a mixer that introduces the atmosphere by suction or pressurization and mixes with the exhaust gas is provided, and cooling control is performed to a temperature range where the denitration catalyst using the exhaust gas temperature has high denitration efficiency. A high temperature exhaust gas denitration apparatus is known from Japanese Patent Laid-Open No. 4-4021.

この発明によると、高温排ガス系にベンチュリ機構を設けて大気を直接吸引混合する手段や、ファンもしくはコンプレッサにより大気を昇圧して高温排ガス系に導入し、排ガスと混合させることで、排ガス温度を冷却制御することに特徴がある。   According to this invention, a venturi mechanism is provided in the high-temperature exhaust gas system, and the atmosphere is directly sucked and mixed, or the air is pressurized by a fan or a compressor, introduced into the high-temperature exhaust gas system, and mixed with the exhaust gas, thereby cooling the exhaust gas temperature. It is characterized by control.

また、特開平8−108045号公報には、ガスタービン下流の排ガス系統に空気冷却器を設けて排ガス温度を低下させた後、アンモニアを注入して脱硝触媒層へ導入することで排ガスの脱硝を行う装置が開示されている。   Japanese Patent Laid-Open No. 8-108045 discloses that an exhaust gas system downstream of a gas turbine is provided with an air cooler to lower the exhaust gas temperature, and then ammonia is injected and introduced into the denitration catalyst layer to denitrate the exhaust gas. An apparatus for performing is disclosed.

特開平4−4021号公報JP-A-4-4021 特開平8−108045号公報JP-A-8-108045

特許文献1(特開平4−4021号公報)記載の発明においては、燃焼排ガスを冷却する際に高温排ガスと希釈空気を混合する混合器を使用しているが、特に混合器から脱硝反応器までの混合距離が十分でない場合は、後流側の温度分布を均一にすることは困難である。   In the invention described in Patent Document 1 (Japanese Patent Application Laid-Open No. 4-4021), a mixer that mixes high-temperature exhaust gas and diluted air is used when cooling the combustion exhaust gas. Especially, from the mixer to the denitration reactor. If the mixing distance is not sufficient, it is difficult to make the temperature distribution on the downstream side uniform.

また特許文献2(特開平8−108045号公報)記載の発明においては、空気冷却器により排ガス温度を低下させている。空気冷却器では、煙突効果により冷却空気を供給しており、動力を必要としないという効果がある反面、温度調整が困難である。また、空気流通孔の間を通過するガスや冷却空気温度が上下で異なることから、後流側の温度分布を均一にすることは困難である。   In the invention described in Patent Document 2 (Japanese Patent Laid-Open No. 8-108045), the exhaust gas temperature is lowered by an air cooler. In the air cooler, cooling air is supplied by the chimney effect, and there is an effect that power is not required, but temperature adjustment is difficult. In addition, since the temperature of the gas passing through the air circulation holes and the cooling air temperature are different from each other, it is difficult to make the temperature distribution on the wake side uniform.

さらに上記発明においては、ガスタービンがトリップした場合の保護装置が設置されておらず、ガスタービンへ高温排ガスが逆流する可能性がある。
本発明の課題は、ガスタービンから排出される高温排ガスの脱硝処理を行う脱硝処理装置と方法を提供することである。
Furthermore, in the said invention, the protective device when a gas turbine trips is not installed, but high temperature exhaust gas may flow backward to a gas turbine.
An object of the present invention is to provide a denitration treatment apparatus and method for performing denitration treatment of high-temperature exhaust gas discharged from a gas turbine.

本発明の上記課題は次の解決手段で解決される。
請求項1記載の発明は、ガスタービン(3)から排出する排ガスが流れる排ガスダクト(12)にアンモニア接触還元用の脱硝反応器(4)を設け、該脱硝反応器(4)の前流側の排ガスダクト(12)に空気を導入して排ガスを冷却するための排ガス希釈空気ファン(6)と該排ガス希釈空気ファン(6)からの排ガス希釈空気を流す排ガス希釈空気ダクト(10)を排ガスダクト(12)に接続し、排ガス希釈空気ダクト(10)からの排ガス希釈空気と排ガスとを混合するための混合器として複数のスリット(2)を有するミキシングフォイル(1)を脱硝反応器(4)の前流側の排ガスダクト(12)に配置したことを特徴とする排ガス用脱硝装置である。
The above-mentioned problem of the present invention is solved by the following means.
According to the first aspect of the present invention, a denitration reactor (4) for catalytic catalytic reduction is provided in an exhaust gas duct (12) through which exhaust gas discharged from a gas turbine (3) flows, and the upstream side of the denitration reactor (4) The exhaust gas diluted air fan (6) for cooling the exhaust gas by introducing air into the exhaust gas duct (12) and the exhaust gas diluted air duct (10) through which the exhaust gas diluted air from the exhaust gas diluted air fan (6) flows A mixing foil (1) having a plurality of slits (2) connected to the duct (12) and mixing the exhaust gas diluted air from the exhaust gas diluted air duct (10) and the exhaust gas is removed from the denitration reactor (4). ) Is disposed in the exhaust gas duct (12) on the upstream side of the exhaust gas.

請求項2記載の発明は、高温排ガス逆流防止用の逆止ダンパ(8)を排ガス希釈空気ダクト(10)内に配置し、排ガスダクト(12)内にシール用空気を導入するシール空気ファン(7)付のシール空気配管(11)を逆止ダンパ(8)を設置した部位より後流側の排ガス希釈空気ダクト(10)に接続したことを特徴とする請求項1記載の排ガス用脱硝装置である。   According to the second aspect of the present invention, a check air fan (8) for preventing a high-temperature exhaust gas backflow is disposed in the exhaust gas dilution air duct (10), and a sealing air fan (12) for introducing sealing air into the exhaust gas duct (12). 7) A denitration apparatus for exhaust gas according to claim 1, wherein the attached seal air pipe (11) is connected to the exhaust gas dilution air duct (10) on the downstream side of the part where the check damper (8) is installed. It is.

請求項3記載の発明は、脱硝反応器(4)の入口側の排ガスダクト(12)に温度計を設置し、該温度計により脱硝反応器(4)の入口温度が設定値以上の高温になった場合に、ガスタービン(3)をトリップさせる制御機構を備えた請求項1又は2記載の排ガス用脱硝装置である。   According to the third aspect of the present invention, a thermometer is installed in the exhaust gas duct (12) on the inlet side of the denitration reactor (4), and the temperature of the inlet of the denitration reactor (4) is set to a high temperature that is equal to or higher than a set value. The denitration device for exhaust gas according to claim 1 or 2, further comprising a control mechanism for tripping the gas turbine (3) when it becomes.

請求項4記載の発明は、排ガス希釈空気ファン(6)がトリップした場合に、ガスタービン(3)をトリップさせ、同時にシール空気ファン(7)を起動させる制御機構を備えた請求項1から3の何れかに記載の排ガス用脱硝装置である。   The invention according to claim 4 is provided with a control mechanism for tripping the gas turbine (3) and simultaneously starting the seal air fan (7) when the exhaust gas dilution air fan (6) trips. The denitration device for exhaust gas according to any one of the above.

請求項5記載の発明は、ガスタービン(3)からの排ガスが流れる排ガスダクト(12)に配置したミキシングフォイル(1)に排ガス希釈空気を導入して排ガスと混合させ、排ガス希釈空気により冷却された排ガスをアンモニア接触還元式の脱硝反応により処理することを特徴とする排ガス用脱硝方法である。   According to the fifth aspect of the present invention, the exhaust gas diluted air is introduced into the mixing foil (1) disposed in the exhaust gas duct (12) through which the exhaust gas from the gas turbine (3) flows and mixed with the exhaust gas, and is cooled by the exhaust gas diluted air. The exhaust gas denitration method is characterized by treating the exhaust gas by an ammonia catalytic reduction type denitration reaction.

請求項6記載の発明は、ガスタービン排ガスが逆流することを防止しながら排ガス希釈用の空気をガスタービン(3)の排ガスダクト(12)内に導入し、ガスタービン排ガスが逆流することを防止しながらシール用空気を排ガスと排ガス希釈用の空気を混合する前の排ガスダクト(12)に導入することを特徴とする請求項5記載の排ガス用脱硝方法である。   According to the sixth aspect of the present invention, the air for exhaust gas dilution is introduced into the exhaust gas duct (12) of the gas turbine (3) while preventing the gas turbine exhaust gas from flowing backward, thereby preventing the gas turbine exhaust gas from flowing backward. 6. The exhaust gas denitration method according to claim 5, wherein the sealing air is introduced into the exhaust gas duct (12) before mixing the exhaust gas and the exhaust gas dilution air.

請求項7記載の発明は、アンモニア接触還元式の脱硝反応を行う直前の排ガスダクト(12)内の排ガス温度が設定値以上の高温になった場合に、ガスタービン(3)をトリップさせることを特徴とする請求項5又は6記載の排ガス用脱硝方法である。   The invention according to claim 7 is to trip the gas turbine (3) when the exhaust gas temperature in the exhaust gas duct (12) immediately before performing the ammonia catalytic reduction type denitration reaction becomes a high temperature equal to or higher than a set value. It is the denitration method for exhaust gas of Claim 5 or 6 characterized by the above-mentioned.

請求項8記載の発明は、排ガス希釈空気が排ガスダクト(12)内に導入出来なくなった場合に、ガスタービン(3)をトリップさせ、同時にシール用空気を導入することを特徴とする請求項5から7の何れかに記載の排ガス用脱硝方法である。   The invention according to claim 8 is characterized in that when the exhaust gas diluted air cannot be introduced into the exhaust gas duct (12), the gas turbine (3) is tripped and the sealing air is introduced at the same time. To 7. The exhaust gas denitration method according to any one of items 1 to 7.

本発明の排ガス処理装置における脱硝装置への排ガス入口温度(500℃以下)は従来のコンバインドサイクルの温度(350℃)に比べて高温となっているため、排ガス流速が大きく、混合器設置による圧力損失への影響が大きくなるという課題があったが、請求項1、5記載の発明によれば混合器としてミキシングフォイル1を採用することで、混合性能改善を可能とするだけでなく、排ガス流速増加による圧損増加分を極力低減することが期待でき、排ガス希釈空気ファン6側の圧損も低減することが可能である。   Since the exhaust gas inlet temperature (500 ° C. or lower) to the denitration device in the exhaust gas treatment apparatus of the present invention is higher than the temperature of the conventional combined cycle (350 ° C.), the exhaust gas flow velocity is large and the pressure due to the mixer installation Although there is a problem that the influence on the loss becomes large, according to the first and fifth aspects of the invention, not only the mixing performance can be improved by adopting the mixing foil 1 as the mixer, but also the exhaust gas flow velocity. An increase in pressure loss due to the increase can be expected to be reduced as much as possible, and the pressure loss on the exhaust gas dilution air fan 6 side can also be reduced.

さらに、各ミキシングフォイル1間の排ガス流速が大きくなるため、各スリット2の出口の圧力が負圧となり、排ガス希釈空気ファン6側の吐出圧低減効果があり、また排ガス希釈空気ファン6側の吐出圧を低減することで、ファン動力低減となり、脱硝装置全体の効率的運用が可能となる。   Furthermore, since the exhaust gas flow velocity between the mixing foils 1 is increased, the pressure at the outlet of each slit 2 becomes negative, which has an effect of reducing the discharge pressure on the exhaust gas dilution air fan 6 side, and the discharge on the exhaust gas dilution air fan 6 side. By reducing the pressure, the fan power is reduced and the entire denitration apparatus can be operated efficiently.

請求項2、6記載の発明によれば、請求項1記載の発明の効果に加えて、高温排ガス逆流防止用の逆止ダンパ8をミキシングフォイル1の前流側の排ガス希釈空気ダクト10に配置し、該逆止ダンパ8とミキシングフォイル1の間にシール用空気が流通するシール空気配管11に空気を送るシール空気ファン7を設けたので、タービントリップ時にも高温排ガスが排ガス希釈空気ダクト10、シール空気配管11に逆流することがなくなる。   According to the second and sixth aspects of the invention, in addition to the effect of the first aspect of the invention, the check damper 8 for preventing the high temperature exhaust gas backflow is disposed in the exhaust gas dilution air duct 10 on the upstream side of the mixing foil 1. In addition, since the sealing air fan 7 is provided between the check damper 8 and the mixing foil 1, the sealing air fan 7 for sending the air to the sealing air pipe 11 through which the sealing air circulates. The backflow to the seal air pipe 11 is eliminated.

請求項3、7記載の発明によれば、請求項1、2、又は請求項5、6記載の発明の効果に加えて、脱硝反応器4の入口側の排ガスダクト12内の温度により脱硝反応器4の前記入口温度が設定値以上の高温になった場合に、ガスタービン3をトリップさせることができ、従来よりも安全性が高くなる。   According to the third and seventh aspects of the invention, in addition to the effects of the first and second aspects or the fifth and sixth aspects of the invention, the denitration reaction is effected by the temperature in the exhaust gas duct 12 on the inlet side of the denitration reactor 4 When the inlet temperature of the vessel 4 becomes higher than a set value, the gas turbine 3 can be tripped, and the safety is higher than in the prior art.

請求項4、8記載の発明によれば、請求項1から3のいずれか、又は請求項5から7のいずれかに記載の発明の効果に加えて、排ガス希釈空気ファン6がトリップした場合に、ガスタービン3をトリップさせ、同時にシール空気ファン7を起動させることができ、従来よりも安全性が高くなる。   According to the invention of Claims 4 and 8, in addition to the effect of the invention of any one of Claims 1 to 3 or Claims 5 to 7, when the exhaust gas dilution air fan 6 trips The gas turbine 3 can be tripped and the sealed air fan 7 can be started at the same time, and the safety is higher than in the prior art.

本発明の排ガス処理装置を示す図である。It is a figure which shows the waste gas processing apparatus of this invention. 図1のミキシングフォイルの概略斜視図(図2(a))とミキシングフォイルが設置される排ガスダクト部分の平面図(図2(b))である。FIG. 2 is a schematic perspective view (FIG. 2A) of the mixing foil of FIG. 1 and a plan view (FIG. 2B) of an exhaust gas duct portion where the mixing foil is installed.

本発明の実施の形態を図面と共に説明する。
本発明の一実施形態の排ガス処理システムの概要を図1に示す。ガスタービン排ガスは排ガスダクト12から空気と排ガスを混合する混合器(ミキシングフォイル)1へ送り込まれる。混合器(ミキシングフォイル)1の後流側の排ガスダクト12にはアンモニア注入ノズル16とアンモニア接触還元触媒を有する脱硝反応器4と煙突5が順次配置されている。
Embodiments of the present invention will be described with reference to the drawings.
An outline of an exhaust gas treatment system according to an embodiment of the present invention is shown in FIG. The gas turbine exhaust gas is fed from an exhaust gas duct 12 to a mixer (mixing foil) 1 that mixes air and exhaust gas. In the exhaust gas duct 12 on the downstream side of the mixer (mixing foil) 1, a denitration reactor 4 having an ammonia injection nozzle 16, an ammonia catalytic reduction catalyst, and a chimney 5 are sequentially arranged.

アンモニア注入ノズル16は図1ではミキシングフォイル1と脱硝反応器4の間に設置しているが、この位置よりも前流側の排ガスダクト12に設置しても良い。
また、排ガス希釈空気ファン6により導入される空気が排ガス希釈空気ダクト10を経由してミキシングフォイル1に導入され、排ガスダクト12から供給される排ガスと混合される。排ガス希釈空気ファン6により導入される排ガス希釈空気とアンモニア注入ノズル16から注入されるアンモニアを排ガス希釈空気ダクト10内で混合し、その後ミキシングフォイル1により排ガス希釈空気とアンモニアの混合度合いを高めてもよい。
Although the ammonia injection nozzle 16 is installed between the mixing foil 1 and the denitration reactor 4 in FIG. 1, it may be installed in the exhaust gas duct 12 on the upstream side of this position.
Further, the air introduced by the exhaust gas dilution air fan 6 is introduced into the mixing foil 1 via the exhaust gas dilution air duct 10 and mixed with the exhaust gas supplied from the exhaust gas duct 12. Even if the exhaust gas dilution air introduced by the exhaust gas dilution air fan 6 and the ammonia injected from the ammonia injection nozzle 16 are mixed in the exhaust gas dilution air duct 10 and then the mixing foil 1 increases the degree of mixing of the exhaust gas dilution air and ammonia. Good.

排ガス希釈用の空気を希釈空気ダクト10から脱硝反応器4が設置されている排ガスダクト12内の前流側に混入することにより、脱硝反応器4の入口での排ガス温度を冷却して、脱硝触媒の性能及び脱硝反応器4の構造強度を保つことができる。   By mixing the exhaust gas dilution air from the dilution air duct 10 into the upstream side of the exhaust gas duct 12 in which the denitration reactor 4 is installed, the exhaust gas temperature at the inlet of the denitration reactor 4 is cooled, and the denitration is performed. The performance of the catalyst and the structural strength of the denitration reactor 4 can be maintained.

本実施例においては、排ガスと空気の混合器としてミキシングフォイル1を採用することにより、高温排ガスの冷却効果を高め、混合器1と脱硝反応器4までの混合距離が十分でない場合においても、後流側の温度分布を均一にすることが可能である。   In this embodiment, the mixing foil 1 is used as an exhaust gas / air mixer to enhance the cooling effect of the high temperature exhaust gas. Even when the mixing distance between the mixer 1 and the denitration reactor 4 is not sufficient, It is possible to make the temperature distribution on the flow side uniform.

ガスタービン3から排出する排ガス量は100%負荷時で約280,000mN/hであり、排ガス温度は約550℃である。この排ガスを脱硝触媒の脱硝反応効率が高い温度範囲(500℃以下)に下げるために必要な空気量は、約50,000mN/hであり、この風量を吐出できるファンを排ガス希釈空気ファン6として選定する。 The amount of exhaust gas discharged from the gas turbine 3 is about 280,000 m 3 N / h at 100% load, and the exhaust gas temperature is about 550 ° C. The amount of air required to reduce the exhaust gas to a temperature range (500 ° C. or less) where the denitration catalyst has a high denitration reaction efficiency is about 50,000 m 3 N / h. Select as 6.

また、排ガス希釈空気ダクト10には逆止ダンパ8を設置し、排ガスダクト12内の高温排ガスが排ガス希釈空気ダクト10に逆流するのを防止して排ガス希釈空気ファン6の保護を図る。さらに、ミキシングフォイル1と逆止ダンパ8との間にシール空気配管11を接続し、シール空気配管11にシール空気ファン7を設置することで、排ガス希釈空気ファン6がトリップした時に排ガスダクト12内の高温排ガスがシール空気配管11及び排ガス希釈空気ファン6に逆流するのを防止する。また、シール空気配管11には逆止弁9を設けることで、発電所全体の停電時にも排ガスがシール空気配管11及び排ガス希釈空気ファン6に逆流するのを防ぐことが可能である。   Further, a check damper 8 is installed in the exhaust gas dilution air duct 10 to prevent the high temperature exhaust gas in the exhaust gas duct 12 from flowing back to the exhaust gas dilution air duct 10 to protect the exhaust gas dilution air fan 6. Further, a seal air pipe 11 is connected between the mixing foil 1 and the check damper 8, and a seal air fan 7 is installed in the seal air pipe 11, so that the exhaust gas dilution air fan 6 trips in the exhaust gas duct 12. Is prevented from flowing back to the seal air pipe 11 and the exhaust gas dilution air fan 6. In addition, by providing the check air pipe 9 in the seal air pipe 11, it is possible to prevent the exhaust gas from flowing back to the seal air pipe 11 and the exhaust gas dilution air fan 6 even during a power failure of the entire power plant.

また、図1に示すように、排ガス希釈空気ダクト10は排ガスダクト12の上部に一旦立ち上げ、その後、ミキシングフォイル1を排ガスダクト12の上部から排ガスダクト12内に挿入する配置とする。高温の気体は上昇する性質があるため、発電所全体が停電した場合においても、配置上高温排ガスは排ガスダクト12上部の排ガス希釈空気ダクト10に留まり、排ガス希釈空気ファン6やシール空気ファン7まで高温の状態で到達することを防ぐことができる。   In addition, as shown in FIG. 1, the exhaust gas dilution air duct 10 is temporarily raised above the exhaust gas duct 12 and then the mixing foil 1 is inserted into the exhaust gas duct 12 from the upper part of the exhaust gas duct 12. Since the high-temperature gas has the property of rising, even when the entire power plant fails, the high-temperature exhaust gas remains in the exhaust gas dilution air duct 10 above the exhaust gas duct 12 in terms of arrangement, up to the exhaust gas dilution air fan 6 and the seal air fan 7 Reaching at a high temperature can be prevented.

ミキシングフォイル(混合器)1の構造は図2に示すように、上部から見ると、ガス流れ上流側が曲形となり、下流側となるにつれ先細りした構造物であり、側面には複数のスリット2が設けられている。   As shown in FIG. 2, the structure of the mixing foil (mixer) 1 is a structure in which the upstream side of the gas flow is curved when viewed from the top, and is tapered toward the downstream side. Is provided.

ミキシングフォイル1の両側面に設けられるスリット2の個数と大きさは、排ガス希釈空気ファン6側の許容圧力損失にも関わってくるが、排ガス流れのシミュレーション結果に従い、スリット2の大きさを変えたり、部分的にスリット2を間引きする等により、排ガスの空気の混合性を改善することも可能である。   The number and size of the slits 2 provided on both sides of the mixing foil 1 are related to the allowable pressure loss on the exhaust gas dilution air fan 6 side, but the size of the slits 2 can be changed according to the exhaust gas flow simulation results. It is also possible to improve the miscibility of the exhaust gas air by partially thinning out the slits 2.

また、シール空気ファン7はプラント運転時においては、基本的に停止した状態であるが、排ガス希釈空気ファン6の停止信号により、起動する構成とする。
また、本実施例では排ガス系統と空気系統の間にミキシングフォイル1を設置した構成としているため、発電所全体の停電時等においても、ガスタービン3からの高温排ガスが空気系統へ流入する際の抵抗体としてミキシングフォイル1が働く。
The sealed air fan 7 is basically in a stopped state during plant operation, but is configured to start in response to a stop signal from the exhaust gas diluted air fan 6.
In the present embodiment, since the mixing foil 1 is installed between the exhaust gas system and the air system, the high temperature exhaust gas from the gas turbine 3 flows into the air system even during a power failure of the entire power plant. The mixing foil 1 works as a resistor.

さらに、シール空気ファン7は排ガス希釈空気ダクト10に接続するシール空気配管11に逆止弁9付きで設けられ、また排ガス希釈空気ファン6は排ガス希釈空気ダクト10内に逆止ダンパ8付きで設けられるので、発電所全体の停電時等においても、高温排ガスがシール空気ファン7と排ガス希釈空気ファン6に逆流することを防ぐことが出来る。   Further, the seal air fan 7 is provided with a check valve 9 in a seal air pipe 11 connected to the exhaust gas dilution air duct 10, and the exhaust gas dilution air fan 6 is provided with a check damper 8 in the exhaust gas dilution air duct 10. Therefore, it is possible to prevent the high-temperature exhaust gas from flowing backward to the seal air fan 7 and the exhaust gas dilution air fan 6 even during a power failure of the entire power plant.

1. ミキシングフォイル 2. スリット
3. ガスタービン 4. 脱硝反応器
5. 煙突 6. 排ガス希釈空気ファン
7. シール空気ファン 8. 逆止ダンパ
9. 逆止弁 10. 排ガス希釈空気ダクト
11. シール空気配管 12. 排ガスダクト
1. Mixing foil 2. Slit
3. Gas turbine 4. Denitration reactor
5. Chimney 6. Exhaust gas dilution air fan
7. Sealing air fan 8. Check damper
9. Check valve 10. Exhaust gas dilution air duct
11. Sealed air piping 12. Exhaust gas duct

本発明の上記課題は次の解決手段で解決される。
請求項1記載の発明は、ガスタービン(3)から排出する排ガスが流れる排ガスダクト(12)にアンモニア接触還元用の脱硝反応器(4)を設け、該脱硝反応器(4)の前流側の排ガスダクト(12)に空気を導入して排ガスを500℃以下に冷却するための排ガス希釈空気ファン(6)と該排ガス希釈空気ファン(6)からの排ガス希釈空気を流す排ガス希釈空気ダクト(10)を排ガスダクト(12)に接続し、排ガス希釈空気ダクト(10)からの排ガス希釈空気と排ガスとを混合するための混合器として複数のスリット(2)を有するミキシングフォイル(1)を脱硝反応器(4)の前流側の排ガスダクト(12)に配置したことを特徴とする排ガス用脱硝装置である。
The above-mentioned problem of the present invention is solved by the following means.
According to the first aspect of the present invention, a denitration reactor (4) for catalytic catalytic reduction is provided in an exhaust gas duct (12) through which exhaust gas discharged from a gas turbine (3) flows, and the upstream side of the denitration reactor (4) Exhaust gas dilution air fan (6) for introducing air into the exhaust gas duct (12) to cool the exhaust gas to 500 ° C. or less, and an exhaust gas dilution air duct (flowing exhaust gas dilution air from the exhaust gas dilution air fan (6)) 10) is connected to the exhaust gas duct (12), and the mixing foil (1) having a plurality of slits (2) is denitrated as a mixer for mixing the exhaust gas diluted air from the exhaust gas diluted air duct (10) and the exhaust gas. The exhaust gas denitration apparatus is arranged in an exhaust gas duct (12) on the upstream side of the reactor (4).

請求項2記載の発明は、高温排ガス逆流防止用の逆止ダンパ(8)を排ガス希釈空気ダクト(10)内に配置し、排ガスダクト(12)内にシール用空気を導入するシール空気ファン(7)付のシール空気配管(11)を逆止ダンパ(8)を設置した部位より後流側の排ガス希釈空気ダクト(10)に接続し、さらに排ガス希釈空気ダクト(10)は排ガスダクト(12)の上方部位に一旦立ち上げ、その後、排ガス希釈空気ダクト(10)に接続したミキシングフォイル(1)により排ガスダクト(10)の上方部位から排ガスダクト(12)内に挿入する配置としたことを特徴とするたことを特徴とする請求項1記載の排ガス用脱硝装置である。 According to the second aspect of the present invention, a check air fan (8) for preventing a high-temperature exhaust gas backflow is disposed in the exhaust gas dilution air duct (10), and a sealing air fan (12) for introducing sealing air into the exhaust gas duct (12). 7) The attached seal air pipe (11) is connected to the exhaust gas dilution air duct (10) downstream from the portion where the check damper (8) is installed, and the exhaust gas dilution air duct (10) is connected to the exhaust gas duct (12). ) And then placed in the exhaust duct (12) from the upper part of the exhaust duct (10) by the mixing foil (1) connected to the exhaust gas dilution air duct (10). 2. The exhaust gas denitration apparatus according to claim 1, wherein the exhaust gas denitration apparatus is characterized.

請求項5記載の発明は、ガスタービン(3)からの排ガスが流れる排ガスダクト(12)に配置したミキシングフォイル(1)に排ガス希釈空気を導入して排ガスと混合させ、排ガス希釈空気により500℃以下に冷却された排ガスをアンモニア接触還元式の脱硝反応により処理することを特徴とする排ガス用脱硝方法である。 According to the fifth aspect of the present invention, the exhaust gas diluted air is introduced into the mixing foil (1) disposed in the exhaust gas duct (12) through which the exhaust gas from the gas turbine (3) flows, and mixed with the exhaust gas, and the exhaust gas diluted air is heated to 500 ° C. a flue gas denitration method, which comprises treating the cooled exhaust gas by denitration reaction of ammonia catalytic reduction type below.

請求項6記載の発明は、ガスタービン排ガスが逆流することを防止しながら排ガス希釈用の空気を排ガスダクト(12)の上方部位に一旦立ち上げた後に、ミキシングフォイル(1)を経由して排ガスダクト(12)内に導入し、さらに、ガスタービン排ガスが逆流することを防止しながらシール用空気を排ガスと排ガス希釈用の空気を混合する前の排ガスダクト(12)に導入することを特徴とする請求項5記載の排ガス用脱硝方法である。 According to the sixth aspect of the present invention, after the exhaust gas dilution air is once raised up above the exhaust gas duct (12) while preventing the gas turbine exhaust gas from flowing backward, the exhaust gas passes through the mixing foil (1). Introducing into the duct (12) and further introducing the sealing air into the exhaust gas duct (12) before mixing the exhaust gas and the exhaust gas dilution air while preventing the gas turbine exhaust gas from flowing backward The denitration method for exhaust gas according to claim 5.

請求項2、6記載の発明によれば、請求項1、5記載の発明の効果に加えて、高温排ガス逆流防止用の逆止ダンパ8を排ガス希釈空気ダクト10に配置し、排ガスダクト12内にシール用空気を導入するシール空気ファン7付のシール空気配管11を逆止ダンパ8を設置した部位より後流側の排ガス希釈空気ダクト10に接続し、さらに排ガス希釈空気ダクト10は排ガスダクト12の上方部位に一旦立ち上げ、その後、排ガス希釈空気ダクトに接続したミキシングフォイル1により排ガスダクト12の上方部位から排ガスダクト12内に挿入する配置としたこと及び、排ガス希釈用の空気を排ガスダクトの上方部位に一旦立ち上げた後に、ミキシングフォイルを経由して排ガスダクトの上方部位から排ガスダクト内に導入し、さらに、ガスタービン排ガスが逆流することを防止しながらシール用空気を排ガスと排ガス希釈用の空気を混合する前の排ガスダクトに導入することにより、高温の気体は上昇する性質があるため、発電所全体が停電した場合においても、配置上高温排ガスは排ガスダクト12上部の排ガス希釈空気ダクト10に留まり、排ガス希釈空気ファン6やシール空気ファン7まで高温の状態で到達することを防ぐことができる効果がある。 According to the invention of claim 2,6, wherein, in addition to the effect of claim 1, 5 the invention described, to place the check damper 8 for preventing high-temperature exhaust gas flowing back to the exhaust gas dilution air duct 10, an exhaust gas duct A sealing air pipe 11 with a sealing air fan 7 for introducing sealing air into the inside 12 is connected to the exhaust gas dilution air duct 10 on the downstream side of the part where the check damper 8 is installed. It is arranged so that it is once set up in the upper part of the duct 12 and then inserted into the exhaust gas duct 12 from the upper part of the exhaust gas duct 12 by the mixing foil 1 connected to the exhaust gas dilution air duct. After starting up at the upper part of the duct, it is introduced into the exhaust gas duct from the upper part of the exhaust gas duct via the mixing foil. By introducing the sealing air into the exhaust gas duct before mixing the exhaust gas and the exhaust gas dilution air while preventing the back flow of the turbine exhaust gas, the high temperature gas has the property of rising, so the entire power station Even in this case, the high-temperature exhaust gas stays in the exhaust gas diluted air duct 10 above the exhaust gas duct 12 in terms of arrangement, and it is possible to prevent the exhaust gas diluted air fan 6 and the seal air fan 7 from reaching a high temperature state.

Claims (8)

ガスタービンから排出する排ガスが流れる排ガスダクトにアンモニア接触還元用の脱硝反応器を設け、
該脱硝反応器の前流側の排ガスダクトに空気を導入して排ガスを冷却するための排ガス希釈空気ファンと該排ガス希釈空気ファンからの排ガス希釈空気を流す排ガス希釈空気ダクトを排ガスダクトに接続し、
排ガス希釈空気ダクトからの排ガス希釈空気と排ガスとを混合するための混合器として複数のスリットを有するミキシングフォイルを脱硝反応器の前流側の排ガスダクトに配置したことを特徴とする排ガス用脱硝装置。
A denitration reactor for catalytic catalytic reduction is installed in the exhaust duct through which the exhaust gas discharged from the gas turbine flows.
An exhaust gas dilution air fan for cooling the exhaust gas by introducing air into the exhaust gas duct on the upstream side of the denitration reactor, and an exhaust gas dilution air duct for flowing the exhaust gas dilution air from the exhaust gas dilution air fan are connected to the exhaust gas duct. ,
A denitration apparatus for exhaust gas, characterized in that a mixing foil having a plurality of slits is disposed in the exhaust gas duct on the upstream side of the denitration reactor as a mixer for mixing the exhaust gas diluted air and the exhaust gas from the exhaust gas dilution air duct .
高温排ガス逆流防止用の逆止ダンパを排ガス希釈空気ダクト内に配置し、
排ガスダクト内にシール用空気を導入するシール空気ファン付のシール空気配管を逆止ダンパを設置した部位より後流側の排ガス希釈空気ダクトに接続したことを特徴とする請求項1記載の排ガス用脱硝装置。
A check damper for preventing high-temperature exhaust gas backflow is placed in the exhaust gas dilution air duct,
2. The exhaust gas for exhaust gas according to claim 1, wherein a seal air pipe with a seal air fan for introducing seal air into the exhaust gas duct is connected to an exhaust gas dilution air duct on the downstream side of the part where the check damper is installed. Denitration equipment.
脱硝反応器の入口側の排ガスダクトに温度計を設置し、該温度計により脱硝反応器の入口温度が設定値以上の高温になった場合に、ガスタービンをトリップさせる制御機構を備えた請求項1又は2記載の排ガス用脱硝装置。   A thermometer is installed in the exhaust gas duct on the inlet side of the denitration reactor, and a control mechanism for tripping the gas turbine when the inlet temperature of the denitration reactor becomes higher than a set value by the thermometer is provided. 3. A denitration apparatus for exhaust gas according to 1 or 2. 排ガス希釈空気ファンがトリップした場合に、ガスタービンをトリップさせ、同時にシール空気ファンを起動させる制御機構を備えた請求項1から3の何れかに記載の排ガス用脱硝装置。   The denitration device for exhaust gas according to any one of claims 1 to 3, further comprising a control mechanism for tripping the gas turbine and simultaneously starting the seal air fan when the exhaust gas dilution air fan trips. ガスタービンからの排ガスが流れる排ガスダクトに配置したキシングフォイルに排ガス希釈空気を導入して排ガスと混合させ、排ガス希釈空気により冷却された排ガスをアンモニア接触還元式の脱硝反応により処理することを特徴とする排ガス用脱硝方法。   The exhaust gas diluted air is introduced into a xing foil disposed in the exhaust gas duct through which the exhaust gas from the gas turbine flows and mixed with the exhaust gas, and the exhaust gas cooled by the exhaust gas diluted air is treated by an ammonia catalytic reduction type denitration reaction. A denitration method for exhaust gas. ガスタービン排ガスが逆流することを防止しながら排ガス希釈用の空気をガスタービンの排ガスダクト内に導入し、ガスタービン排ガスが逆流することを防止しながらシール用空気を排ガスと排ガス希釈用の空気を混合する前の排ガスダクトに導入することを特徴とする請求項5記載の排ガス用脱硝方法。   The exhaust gas dilution air is introduced into the exhaust duct of the gas turbine while preventing the gas turbine exhaust gas from flowing backward, and the sealing air is supplied to the exhaust gas and the exhaust gas dilution air while preventing the gas turbine exhaust gas from flowing backward. 6. The exhaust gas denitration method according to claim 5, wherein the exhaust gas duct is introduced into an exhaust gas duct before mixing. アンモニア接触還元式の脱硝反応を行う直前の排ガスダクト内の排ガス温度が設定値以上の高温になった場合に、ガスタービンをトリップさせることを特徴とする請求項5又は6記載の排ガス用脱硝方法。   The denitration method for exhaust gas according to claim 5 or 6, wherein the gas turbine is tripped when the exhaust gas temperature in the exhaust gas duct immediately before performing the ammonia catalytic reduction type denitration reaction becomes higher than a set value. . 排ガス希釈空気が排ガスダクト内に導入出来なくなった場合に、ガスタービンをトリップさせ、同時にシール用空気を導入することを特徴とする請求項5から7の何れかに記載の排ガス用脱硝方法。   8. The denitration method for exhaust gas according to claim 5, wherein when the exhaust gas diluted air cannot be introduced into the exhaust gas duct, the gas turbine is tripped and simultaneously the sealing air is introduced.
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CN109663495A (en) * 2017-10-16 2019-04-23 中国石油化工股份有限公司 Coal-burning boiler SCR denitration process and its ammonia/air mixer
CN110359985A (en) * 2018-04-11 2019-10-22 埃贝斯佩歇排气技术有限责任两合公司 The gas/gas mixer in waste gas stream for introducing gas into internal combustion engine
EP3553290B1 (en) * 2018-04-11 2020-11-04 Eberspächer Exhaust Technology GmbH & Co. KG Gas/gas mixer for introducing gas into the waste gas flow of a combustion engine
US10934977B2 (en) 2018-04-11 2021-03-02 Eberspächer Exhaust Technology GmbH & Co. KG Gas/gas mixer for introducing gas into the exhaust gas stream of an internal combustion engine
CN110359985B (en) * 2018-04-11 2021-08-31 埃贝斯佩歇排气技术有限责任两合公司 Gas/gas mixer for introducing gas into the exhaust gas flow of an internal combustion engine

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