JP3181097B2 - Operating method of gas turbine exhaust reburn plant - Google Patents
Operating method of gas turbine exhaust reburn plantInfo
- Publication number
- JP3181097B2 JP3181097B2 JP14567492A JP14567492A JP3181097B2 JP 3181097 B2 JP3181097 B2 JP 3181097B2 JP 14567492 A JP14567492 A JP 14567492A JP 14567492 A JP14567492 A JP 14567492A JP 3181097 B2 JP3181097 B2 JP 3181097B2
- Authority
- JP
- Japan
- Prior art keywords
- gas turbine
- fan
- plant
- pressure
- turbine exhaust
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Engine Equipment That Uses Special Cycles (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明はガスタービン排気再燃プ
ラントに適用されるファンの運転方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for operating a fan applied to a gas turbine exhaust gas reburning plant.
【０００２】[0002]
【従来の技術】図２はガスタービン排気再燃プラントの
一例を示す系統図である。ガスタービン（１）を出た排
気はボイラ（２）に導入され、ファン（誘引通風機）
（３）により図示しないスタックから排出される。2. Description of the Related Art FIG. 2 is a system diagram showing an example of a gas turbine exhaust reburning plant. Exhaust gas exiting the gas turbine (1) is introduced into the boiler (2) and a fan (induction fan)
It is discharged from a stack (not shown) by (3).
【０００３】従来は，ファン（３）付属の圧力調整機構
（例えばダンパ，動翼等）を用いて、ファンよりも上流
の風煙道系統上のどこかの部分（例えばボイラ（２）の
火炉や出口等）の圧力が常に一定となるように制御し運
転していた。すなわち、ガスタービンの許容背圧および
ボイラ火炉耐圧の各々の値を，機器保護上許容値以下と
しなければならないため、火炉や節炭器の出口等どこか
を基準にして、あらゆる運転条件で超えないように圧力
を一定に制御していた。これをファンの特性として示す
と、図３のとおりで、図３（ａ）は遠心ファンの場合、
図３（ｂ）は軸流ファンの場合である。また図中（６）
はシステム抵抗曲線、（７）は運用域である。Conventionally, a pressure adjusting mechanism (for example, a damper, a moving blade, etc.) attached to a fan (3) is used, and a portion of a flue system upstream of the fan (for example, a furnace of a boiler (2)) is used. And the outlet was controlled so that the pressure was always constant. In other words, each value of the allowable back pressure of the gas turbine and the boiler furnace withstand pressure must be below the allowable value for equipment protection. The pressure was controlled to be constant so as not to occur. If this is shown as a characteristic of the fan, it is as shown in FIG. 3, and FIG.
FIG. 3B shows the case of an axial fan. Also in the figure (6)
Is a system resistance curve, and (7) is an operation area.
【０００４】[0004]
【発明が解決しようとする課題】ガスタービンの効率は
背圧の大小によって大きく左右されるが、前記従来の運
転方法では、ファンよりも上流の風煙道系統上のある部
分の圧力が一定になるよう制御するため、圧力調整機構
（例えばダンパ，動翼等）を絞ってわざわざガスタービ
ン背圧を上げ、効率を悪化させている。またファン自体
についても、実運用点では定格負荷はもとより、ガス流
量が減少しシステムロスが減少する部分負荷ではなおさ
ら、圧力調整機構の絞りによるロスが大きく、ファン効
率が低下して補機の所要動力が増加する。したがって、
ファンの運用方法を改善してプラント効率を向上させる
必要がある。The efficiency of a gas turbine largely depends on the magnitude of the back pressure. However, in the conventional operation method, the pressure of a certain portion on the wind duct system upstream of the fan is kept constant. In order to perform such control, the pressure adjustment mechanism (for example, a damper, a moving blade, etc.) is throttled to increase the back pressure of the gas turbine, thereby deteriorating the efficiency. In addition, the fan itself is not only rated at the actual operation point, but also at the partial load where the gas flow rate is reduced and the system loss is reduced, and the loss due to the throttle of the pressure adjustment mechanism is large, the fan efficiency is reduced, and the required auxiliary equipment is required. Power increases. Therefore,
There is a need to improve the efficiency of the fans and improve plant efficiency.
【０００５】[0005]
【課題を解決するための手段】本発明は、前記従来の課
題を解決するために、ガスタービンが設置されている排
気再燃プラントの排ガス系統に設けられたファンを、同
ファンに付属の圧力調整機構をできる限り開き、プラン
トの各部圧力に関係なく、ファン自体の限界内でできる
だけ高い負荷で運転することを特徴とするガスタービン
排気再燃プラントの運転方法を提案するものである。Means for Solving the Problems The present invention, in order to solve the conventional problems, a fan provided in the exhaust system of repowering plant gas turbine is installed, the
It proposes a method for operating a gas turbine exhaust reburning plant characterized by opening the pressure adjustment mechanism attached to the fan as much as possible and operating at the highest possible load within the limits of the fan itself, irrespective of the pressure of each part of the plant. is there.
【０００６】[0006]
【作用】本発明方法においては、風煙道システムの各部
圧力にはとらわれずに、圧力調整機構をできる限り開く
（可能であれば全開）。但し、この場合ファン自体の限
界（サージング等）を考慮した上限までということにな
る。In the method of the present invention, the pressure adjusting mechanism is opened as much as possible (full open if possible) irrespective of the pressure of each part of the wind flue system. However, in this case, it is up to the upper limit in consideration of the limit (surging etc.) of the fan itself.
【０００７】上記のようにファンの圧力調整装置をでき
る限り開くことにより、ファンの吸込圧力をできる限り
下げ、結果としてガスタービン背圧を可能な限り低減で
きる。また、圧力調整装置の絞りによるロスを極小化す
ることができるので、大半の場合にはファン効率の向上
すなわち補機所要動力の低減もできる。[0007] By opening the pressure adjusting device of the fan as much as possible as described above, the suction pressure of the fan can be reduced as much as possible, and as a result, the back pressure of the gas turbine can be reduced as much as possible. In addition, since the loss due to the restriction of the pressure adjusting device can be minimized, the fan efficiency can be improved, that is, the power required for auxiliary equipment can be reduced in most cases.
【０００８】[0008]
【実施例】図１（ａ）は本発明方法の第１実施例とし
て、ファン型式が遠心式の場合の運用方法をファン特性
曲線で示す図である。図中（８）は安定運転領域上限，
（９）は運用域，（６）は図３におけるシステム抵抗曲
線をそれぞれ示している。図３（ａ）に示す従来の運用
方法に比べ、曲線（８）と曲線（６）の間の風圧差分だ
けガスタービン背圧を低減できる。FIG. 1 (a) is a diagram showing, as a first embodiment of the method of the present invention, an operation method when a fan type is a centrifugal type by a fan characteristic curve. (8) in the figure is the upper limit of the stable operation area,
(9) shows the operating area, and (6) shows the system resistance curve in FIG. 3, respectively. Compared with the conventional operation method shown in FIG. 3A, the gas turbine back pressure can be reduced by the wind pressure difference between the curves (8) and (6).
【０００９】次に図１（ｂ）は、本発明方法の第２実施
例として、ファン型式が軸流式の場合の運用方法をファ
ンの特性曲線で示す図である。この図においても、
（８）は安定運転領域上限，（９）は運用域，（６）は
図３におけるシステム抵抗曲線をそれぞれ示している。
図３（ｂ）に示す従来の運用方法に比べ、曲線（８）と
曲線（６）の間の風圧差分だけガスタービン背圧を低減
できる。Next, FIG. 1B is a diagram showing, as a second embodiment of the method of the present invention, an operation method in the case where the fan type is an axial flow type by a characteristic curve of a fan. Also in this figure,
(8) shows the upper limit of the stable operation region, (9) shows the operation range, and (6) shows the system resistance curve in FIG.
Compared with the conventional operation method shown in FIG. 3B, the gas turbine back pressure can be reduced by the wind pressure difference between the curves (8) and (6).
【００１０】[0010]
【発明の効果】本発明方法によれば、ガスタービン背圧
を全負荷域において低減できるので、ガスタービン効率
が向上し、プラント効率を向上させることができる。ま
た、ファンの圧力調整装置における損失を大半の場合最
小限に抑えることができるので、ファン効率が向上し補
機所要動力を低減できる。According to the method of the present invention, the gas turbine back pressure can be reduced in the entire load range, so that the gas turbine efficiency can be improved and the plant efficiency can be improved. In addition, since the loss in the fan pressure regulator can be minimized in most cases, the fan efficiency can be improved and the power required for auxiliary equipment can be reduced.
【図１】図１は本発明の実施例におけるファン運用方法
を示す特性曲線図である。FIG. 1 is a characteristic curve diagram showing a fan operation method according to an embodiment of the present invention.
【図２】図２はガスタービン排気再燃プラントの一例を
示す系統図である。FIG. 2 is a system diagram showing an example of a gas turbine exhaust gas reburning plant.
【図３】図３は従来のファン運用方法を示す特性曲線図
である。FIG. 3 is a characteristic curve diagram showing a conventional fan operation method.
（１） ガスタービン （２） ボイラ （３） ファン （６） システム抵抗曲線 （７） 運用域 （８） 安定運転領域上限 （９） 運用域 (1) Gas turbine (2) Boiler (3) Fan (6) System resistance curve (7) Operation area (8) Upper limit of stable operation area (9) Operation area
Claims (1)
プラントの排ガス系統に設けられたファンを、同ファン
に付属の圧力調整機構をできる限り開き、プラントの各
部圧力に関係なく、ファン自体の限界内でできるだけ高
い負荷で運転することを特徴とするガスタービン排気再
燃プラントの運転方法。1. A fan provided in the exhaust gas system of repowering plant gas turbine is installed, the fan
A method for operating a gas turbine exhaust gas reburning plant, characterized in that the pressure adjusting mechanism attached to the gas turbine is opened as much as possible, and the gas turbine exhaust reburning plant is operated at a load as high as possible within the limits of the fan itself, regardless of the pressure of each part of the plant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14567492A JP3181097B2 (en) | 1992-06-05 | 1992-06-05 | Operating method of gas turbine exhaust reburn plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14567492A JP3181097B2 (en) | 1992-06-05 | 1992-06-05 | Operating method of gas turbine exhaust reburn plant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05340267A JPH05340267A (en) | 1993-12-21 |
| JP3181097B2 true JP3181097B2 (en) | 2001-07-03 |
Family
ID=15390467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14567492A Expired - Fee Related JP3181097B2 (en) | 1992-06-05 | 1992-06-05 | Operating method of gas turbine exhaust reburn plant |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3181097B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7707818B2 (en) | 2008-02-11 | 2010-05-04 | General Electric Company | Exhaust stacks and power generation systems for increasing gas turbine power output |
-
1992
- 1992-06-05 JP JP14567492A patent/JP3181097B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05340267A (en) | 1993-12-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20010313 |
|
| LAPS | Cancellation because of no payment of annual fees |