JP2014211102A - Combined cycle power generation plant - Google Patents
Combined cycle power generation plant Download PDFInfo
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- JP2014211102A JP2014211102A JP2013087036A JP2013087036A JP2014211102A JP 2014211102 A JP2014211102 A JP 2014211102A JP 2013087036 A JP2013087036 A JP 2013087036A JP 2013087036 A JP2013087036 A JP 2013087036A JP 2014211102 A JP2014211102 A JP 2014211102A
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- ammonia
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- dilution fan
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- cycle power
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- 238000010248 power generation Methods 0.000 title 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 118
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 53
- 238000010790 dilution Methods 0.000 claims abstract description 33
- 239000012895 dilution Substances 0.000 claims abstract description 33
- 239000007921 spray Substances 0.000 claims abstract description 17
- 238000011084 recovery Methods 0.000 claims abstract description 13
- 239000007789 gas Substances 0.000 claims description 27
- 239000002912 waste gas Substances 0.000 claims 1
- 230000032683 aging Effects 0.000 abstract description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 14
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000005507 spraying Methods 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
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- Engine Equipment That Uses Special Cycles (AREA)
- Treating Waste Gases (AREA)
Abstract
【課題】プラント運転状態や経年による変化が生じた場合でも、アンモニア希釈ファンによる希釈空気の適正な風量を確保することができる排熱回収ボイラシステムを提供する。【解決手段】排熱回収ボイラの排ガスに噴霧するアンモニアを供給するアンモニア噴霧ライン３と、該アンモニア噴霧ラインのアンモニアの流量を調節する流量調節弁９と、前記アンモニア噴霧ラインに希釈用空気を供給するアンモニア希釈ファン１と、該アンモニア希釈ファンの入口側に設置される入口ダンパ２と、出口側に設置される出口ダンパ８を備え、前記ボイラの排ガス圧力と前記アンモニア希釈ファンの出口空気流量に基づいて、前記入口ダンパの開度を調節する制御装置１０を有する。【選択図】 図１An exhaust heat recovery boiler system capable of ensuring an appropriate air volume of diluted air by an ammonia dilution fan even when a change due to plant operating conditions or aging occurs. An ammonia spray line for supplying ammonia to be sprayed to exhaust gas of an exhaust heat recovery boiler, a flow rate adjusting valve for adjusting the flow rate of ammonia in the ammonia spray line, and supplying dilution air to the ammonia spray line. An ammonia dilution fan 1, an inlet damper 2 installed on the inlet side of the ammonia dilution fan, and an outlet damper 8 installed on the outlet side, and the exhaust gas pressure of the boiler and the outlet air flow rate of the ammonia dilution fan Based on this, the control device 10 for adjusting the opening degree of the inlet damper is provided. [Selection] Figure 1
Description
本発明は、排ガス中の窒素酸化物（ＮＯｘ）を低減するためのアンモニア希釈ファンの風量を適正化するコンバインドサイクル発電プラントに関する。 The present invention relates to a combined cycle power plant that optimizes the air volume of an ammonia dilution fan for reducing nitrogen oxides (NOx) in exhaust gas.
コンバインドサイクル発電プラントにおいては、排熱回収ボイラ（HRSG）の排ガスに希釈空気との混合アンモニアを噴霧し、触媒の化学反応により窒素酸化物（ＮＯｘ）の低減を図っている。しかしながら、プラントの運転状態や経年変化の影響により、アンモニア希釈ファンより供給される希釈空気の風量が低下するため、その都度、入口ダンパの手動調整を行うことが課題となっていた。 In a combined cycle power plant, mixed ammonia with diluted air is sprayed on exhaust gas of an exhaust heat recovery boiler (HRSG) to reduce nitrogen oxides (NOx) by a chemical reaction of the catalyst. However, since the air volume of the diluted air supplied from the ammonia dilution fan decreases due to the influence of the plant operating state and aging, it has been a problem to manually adjust the inlet damper each time.
なお、還元剤としてアンモニアを用いたＮＯｘ低減技術としては、例えば特許文献１，２に記載されたものが存在する。 In addition, as a NOx reduction technique using ammonia as a reducing agent, for example, those described in Patent Documents 1 and 2 exist.
本発明は上述した課題に基づいてなされたもので、プラント運転状態や経年による変化が生じた場合でも、アンモニア希釈ファンによる希釈空気の適正な風量を確保することができるコンバインドサイクル発電プラントを提供することを目的とする。 The present invention has been made based on the above-described problems, and provides a combined cycle power plant that can secure an appropriate air volume of diluted air by an ammonia dilution fan even when a change occurs due to a plant operation state or aging. For the purpose.
上記目的を達成するために、本発明では、ガスタービンと、該ガスタービンの排熱を利用して蒸気を発生させる排熱回収ボイラと、排熱回収ボイラの排ガスに噴霧するアンモニアを供給するアンモニア噴霧ラインと、該アンモニア噴霧ラインを流通するアンモニアの流量を調節する流量調節弁と、前記アンモニア噴霧ラインに希釈用空気を供給するアンモニア希釈ファンと、該アンモニア希釈ファンの入口側に設置される入口ダンパと、前記アンモニア希釈ファンの出口側に設置される出口ダンパを備えたコンバインドサイクル発電プラントにおいて、前記ボイラの排ガス圧力と前記アンモニア希釈ファンの出口空気流量に基づいて、前記入口ダンパの開度を調節する制御装置を備えたことを特徴とする。 In order to achieve the above object, according to the present invention, a gas turbine, an exhaust heat recovery boiler that generates steam using the exhaust heat of the gas turbine, and ammonia that supplies ammonia to be sprayed on the exhaust gas of the exhaust heat recovery boiler A spray line, a flow control valve for adjusting the flow rate of ammonia flowing through the ammonia spray line, an ammonia dilution fan for supplying dilution air to the ammonia spray line, and an inlet installed on the inlet side of the ammonia dilution fan In a combined cycle power plant having a damper and an outlet damper installed on the outlet side of the ammonia dilution fan, the opening degree of the inlet damper is determined based on the exhaust gas pressure of the boiler and the outlet air flow rate of the ammonia dilution fan. A control device for adjusting is provided.
本発明によれば、プラント運転状態や経年による変化が生じた場合でも、アンモニア希釈ファンによる希釈空気の適正な風量を確保することができるコンバインドサイクル発電プラントを提供できる。 According to the present invention, it is possible to provide a combined cycle power plant that can ensure an appropriate air volume of diluted air by an ammonia dilution fan even when a change due to plant operating conditions or aging occurs.
以下、本発明に係るコンバインドサイクル発電プラントの実施形態について、図面を用いて説明する。 Hereinafter, an embodiment of a combined cycle power plant according to the present invention will be described with reference to the drawings.
図1は、本実施例におけるコンバインドサイクル発電プラントの概略系統図である。コンバインドサイクル発電プラントは、大別して、ガスタービン６と、このガスタービン６の排熱を利用して蒸気を発生させる排熱回収ボイラ２０と、排熱回収ボイラ２０で発生した蒸気により駆動される蒸気タービン（図示せず）により構成される。そして、排熱回収ボイラ２０には、排ガス中のＮＯｘを低減するために、排ガスに希釈空気との混合アンモニアを噴霧する噴霧装置及び脱硝装置が設けられている。脱硝装置を経由した排ガスは、ＨＲＳＧ出口ダンパ７を経由して煙突より排出される。 FIG. 1 is a schematic system diagram of a combined cycle power plant in the present embodiment. The combined cycle power plant is roughly divided into a gas turbine 6, an exhaust heat recovery boiler 20 that generates steam using exhaust heat of the gas turbine 6, and steam driven by steam generated in the exhaust heat recovery boiler 20. It is constituted by a turbine (not shown). The exhaust heat recovery boiler 20 is provided with a spraying device and a denitration device for spraying mixed ammonia with diluted air onto the exhaust gas in order to reduce NOx in the exhaust gas. The exhaust gas that has passed through the denitration device is discharged from the chimney via the HRSG outlet damper 7.
次に、本実施例において特徴となるアンモニア噴霧システムについて詳述する。アンモニア噴霧システムの系統構成は、排熱回収ボイラの排ガスに希釈空気との混合アンモニアを供給するNH3噴霧ライン３、このNH3噴霧ラインに希釈空気を供給するアンモニア希釈ファン1、アンモニアの流量を調節するNH3流量調節弁９、アンモニア希釈ファン1の入口側に設けられ吸気口より取込む希釈用空気を調節する入口ダンパ２、アンモニア希釈ファン1の出口側に設けられる出口ダンパ８を備えている。また、アンモニア噴霧システムには、アンモニア希釈ファン１（出口ダンパ８）の出口側の空気流量を計測するアンモニア希釈ファン出口空気流量計測器４、脱硝装置１５の入口側の排ガス圧力を計測するHRSG入口排ガス圧力計測器５、入口ダンパ２の開度を制御する制御装置１０を有する。 Next, an ammonia spray system that is characteristic in the present embodiment will be described in detail. The system configuration of the ammonia spray system is the NH3 spray line 3 that supplies mixed ammonia with diluted air to the exhaust gas of the exhaust heat recovery boiler, the ammonia dilution fan 1 that supplies diluted air to the NH3 spray line, and the flow rate of ammonia is adjusted. An NH3 flow rate adjusting valve 9, an inlet damper 2 that is provided on the inlet side of the ammonia dilution fan 1 and adjusts dilution air taken from the intake port, and an outlet damper 8 that is provided on the outlet side of the ammonia dilution fan 1 are provided. In addition, the ammonia spray system includes an ammonia dilution fan outlet air flow rate measuring device 4 that measures the air flow rate on the outlet side of the ammonia dilution fan 1 (outlet damper 8), and an HRSG inlet port that measures the exhaust gas pressure on the inlet side of the denitration device 15. The exhaust gas pressure measuring device 5 and the control device 10 for controlling the opening degree of the inlet damper 2 are provided.
以上のように構成されたアンモニア噴霧システムでは、アンモニア希釈ファン出口空気流量計測器４で計測された空気流量と、HRSG入口排ガス圧力計測器５で計測された排ガス圧力に基づいて、制御装置１０より入口ダンパ２の開度指令が出力され、この開度指令に基づく入口ダンパ２の開度調整の結果、NH3噴霧ライン３に供給する希釈空気の流量を調節している。 In the ammonia spray system configured as described above, from the control device 10 based on the air flow rate measured by the ammonia dilution fan outlet air flow rate measuring device 4 and the exhaust gas pressure measured by the HRSG inlet exhaust gas pressure measuring device 5. An opening degree command of the inlet damper 2 is output, and as a result of adjusting the opening degree of the inlet damper 2 based on the opening degree command, the flow rate of the diluted air supplied to the NH3 spray line 3 is adjusted.
図２は、アンモニア希釈ファン１の開度調節を行う制御装置の概略ブロック図である。 FIG. 2 is a schematic block diagram of a control device that adjusts the opening degree of the ammonia dilution fan 1.
本実施形態に係るアンモニア希釈ファン入口ダンパ２は、ガスタービン６の起動初期状態及びＨＲＳG出口ダンパ７全開により規定開度まで開操作を行い、ガスタービン６の点火でアンモニア希釈ファン出口空気流量４による先行制御を開始し、ガスタービン６の燃料制御指令50%以上の運転状態においてＨＲＳＧ入口排ガス圧力５によるフィードバック制御を行い、安定風量を確保する。 The ammonia dilution fan inlet damper 2 according to the present embodiment performs the opening operation to the specified opening degree by the initial startup state of the gas turbine 6 and the HRSG outlet damper 7 fully opened, and the ammonia dilution fan outlet air flow rate 4 by ignition of the gas turbine 6 Prior control is started, and feedback control is performed by the HRSG inlet exhaust gas pressure 5 in an operating state where the fuel control command of the gas turbine 6 is 50% or more to secure a stable air volume.
上述したように、本実施例では入口ダンパの風量制御を自動化し、アンモニア希釈ファン出口空気流量での先行制御の後、HRSG入口排ガス圧力によるフィードバック制御を行うことにより安定風量を確保するものである。これにより、コンバインド発電プラントの安定運用が可能となる。 As described above, in this embodiment, the air volume control of the inlet damper is automated, and after the preceding control with the ammonia dilution fan outlet air flow rate, the stable air volume is ensured by performing the feedback control with the HRSG inlet exhaust gas pressure. . Thereby, the stable operation of the combined power plant becomes possible.
１ アンモニア希釈ファン
２ 入口ダンパ
３ NH3噴霧ライン
４ アンモニア希釈ファン出口空気流量計測器
５ HRSG入口排ガス圧力計測器
６ ガスタービン
７ ＨＲＳＧ出口ダンパ
８ 出口ダンパ
９ NH3流量調節弁
１０ 制御装置
１５ 脱硝装置
２０ 排熱回収ボイラ
1 Ammonia dilution fan 2 Inlet damper 3 NH3 spray line 4 Ammonia dilution fan outlet air flow meter 5 HRSG inlet exhaust gas pressure meter 6 Gas turbine 7 HRSG outlet damper 8 Outlet damper 9 NH3 flow control valve 10 Controller 15 Denitration device 20 Exhaust Heat recovery boiler
Claims (2)
該ガスタービンの排熱を利用して蒸気を発生させる排熱回収ボイラと、
排熱回収ボイラの排ガスに噴霧するアンモニアを供給するアンモニア噴霧ラインと、
該アンモニア噴霧ラインを流通するアンモニアの流量を調節する流量調節弁と、
前記アンモニア噴霧ラインに希釈用空気を供給するアンモニア希釈ファンと、
該アンモニア希釈ファンの入口側に設置される入口ダンパと、
前記アンモニア希釈ファンの出口側に設置される出口ダンパを備えたコンバインドサイクル発電プラントにおいて、
前記ボイラの排ガス圧力と前記アンモニア希釈ファンの出口空気流量に基づいて、前記入口ダンパの開度を調節する制御装置を備えたことを特徴とするコンバインドサイクル発電プラント。 A gas turbine,
An exhaust heat recovery boiler that generates steam using the exhaust heat of the gas turbine;
An ammonia spray line for supplying ammonia sprayed to the exhaust gas of the exhaust heat recovery boiler;
A flow rate control valve for adjusting the flow rate of ammonia flowing through the ammonia spray line;
An ammonia dilution fan for supplying dilution air to the ammonia spray line;
An inlet damper installed on the inlet side of the ammonia dilution fan;
In the combined cycle power plant having an outlet damper installed on the outlet side of the ammonia dilution fan,
A combined cycle power plant comprising a control device for adjusting an opening degree of the inlet damper based on an exhaust gas pressure of the boiler and an outlet air flow rate of the ammonia dilution fan.
前記制御装置は、前記アンモニア希釈ファンの出口空気流量に基づく先行制御の後、排熱回収ボイラの排ガス圧力によるフィードバック制御を行うことを特徴とするコンバインドサイクル発電プラント。 In the combined cycle power plant according to claim 1,
The said control apparatus performs the feedback control by the waste gas pressure of an exhaust heat recovery boiler after the advance control based on the exit air flow rate of the said ammonia dilution fan, The combined cycle power plant characterized by the above-mentioned.
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| JP2013087036A JP2014211102A (en) | 2013-04-18 | 2013-04-18 | Combined cycle power generation plant |
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| JP2013087036A JP2014211102A (en) | 2013-04-18 | 2013-04-18 | Combined cycle power generation plant |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110026085A (en) * | 2019-04-18 | 2019-07-19 | 中国大唐集团科学技术研究院有限公司华东电力试验研究院 | A kind of wind ammonia independent control SCR denitration system |
| CN110026064A (en) * | 2019-03-26 | 2019-07-19 | 华泰永创(北京)科技股份有限公司 | The feedway and method of a kind of coke oven denitration in the stove also Primordial Qi |
| WO2019159734A1 (en) * | 2018-02-16 | 2019-08-22 | 三菱日立パワーシステムズ株式会社 | Denitration device, waste heat recovery boiler provided with same, gas turbine combined cycle power plant, and method of denitration |
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| WO2019159734A1 (en) * | 2018-02-16 | 2019-08-22 | 三菱日立パワーシステムズ株式会社 | Denitration device, waste heat recovery boiler provided with same, gas turbine combined cycle power plant, and method of denitration |
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| CN110026085A (en) * | 2019-04-18 | 2019-07-19 | 中国大唐集团科学技术研究院有限公司华东电力试验研究院 | A kind of wind ammonia independent control SCR denitration system |
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