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JPH05240407A - Boiler - Google Patents

Boiler

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Publication number
JPH05240407A
JPH05240407A JP4075952A JP7595292A JPH05240407A JP H05240407 A JPH05240407 A JP H05240407A JP 4075952 A JP4075952 A JP 4075952A JP 7595292 A JP7595292 A JP 7595292A JP H05240407 A JPH05240407 A JP H05240407A
Authority
JP
Japan
Prior art keywords
gas
duct
boiler
exhaust gas
furnace
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.)
Granted
Application number
JP4075952A
Other languages
Japanese (ja)
Other versions
JP3035062B2 (en
Inventor
Takeshi Hoshi
健 保志
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP4075952A priority Critical patent/JP3035062B2/en
Publication of JPH05240407A publication Critical patent/JPH05240407A/en
Application granted granted Critical
Publication of JP3035062B2 publication Critical patent/JP3035062B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Combustion Of Fluid Fuel (AREA)

Abstract

PURPOSE:To enable a gas feed opening of a boiler furnace to be cooled even in case where the operation of a gas recirculating fan is stopped when an exhausted gas recirculation is not required. CONSTITUTION:A gas turbine 11 iscombined with a boiler 1 having an exhausted gas recirculating duct 3 to constitute an exhausted gas reburning boiler, and an exhausted gas from the gas turbine is fed to a burner air box 9 of a boiler furnace 4 through a main gas duct 12. When the exhausted gas recirculation is not required, a damper 14 provided in a duct 13 branching from the main gas duct 12 is opened, and a part of the exhausted gas from the gas turbine is fed to a gas feed opening 5 of the boiler furnace 4 through the duct 13 to cool the opening 5, whereby the operation of a gas recirculating fan 6 can be stopped.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、ボイラ、更に詳細に
は、排ガス再循環システムを有するボイラに関する。
FIELD OF THE INVENTION The present invention relates to boilers, and more particularly to boilers having an exhaust gas recirculation system.

【0002】[0002]

【従来の技術】図2は、排ガス再循環システムを有する
従来のボイラを示す。ボイラ1における再熱蒸気温度を
制御し或はNOxの低減等を図る目的で、ボイラ1の排
ガスダクト2から分岐した排ガス再循環ダクト3を火炉
4に形成したガス投入用開口部5に接続すると共に、該
排ガス再循環ダクト3の途中部分にはガス再循環ファン
6及びダンパ7を設け、該ファン6の作動によりボイラ
1の排ガスの一部を排ガス再循環ダクト3及びダンパ7
を通して火炉2のガス投入用開口部5に導入するように
している。なお、図2において、8は燃焼用空気ダク
ト、9はバーナ風箱である。
2. Description of the Prior Art FIG. 2 shows a conventional boiler having an exhaust gas recirculation system. The exhaust gas recirculation duct 3 branched from the exhaust gas duct 2 of the boiler 1 is connected to the gas injection opening 5 formed in the furnace 4 for the purpose of controlling the reheat steam temperature in the boiler 1 or reducing NOx. At the same time, a gas recirculation fan 6 and a damper 7 are provided in an intermediate part of the exhaust gas recirculation duct 3, and a part of the exhaust gas of the boiler 1 is operated by the operation of the fan 6 so that the exhaust gas recirculation duct 3 and the damper 7 are disposed.
Through the gas charging opening 5 of the furnace 2. In FIG. 2, 8 is a combustion air duct, and 9 is a burner box.

【0003】[0003]

【発明が解決しようとする課題】以上述べたように、ボ
イラの排ガス再循環システムは再熱蒸気温度の制御或は
NOxの低減等の目的で従来より用いられているもので
あるが、往々にして排ガスの再循環が不用となる運用領
域が存在する。しかし、図2に示したように、この再循
環ガス投入用の開口部5は火炉4に設けられるため、火
炉輻射や炉内ガス逆流等による焼損防止の観点から、該
開口部5を冷却する必要があるが、従来のボイラでは燃
焼用空気として大気を図示しないファンによりダクト8
及びバーナ風箱9を通して火炉4内に送り込んでいるた
め、上述した本来の目的からは不要であるにもかかわら
ず、常にガス再循環ファン6を作動して最低必要量の排
ガスを流し、該開口部5を冷却しなくてはならず、した
がって不要なファン動力を消費する。
As described above, the exhaust gas recirculation system of a boiler has been conventionally used for the purpose of controlling the reheat steam temperature or reducing NOx, but is often used. There are operating areas where exhaust gas recirculation is unnecessary. However, as shown in FIG. 2, since the opening 5 for introducing the recirculation gas is provided in the furnace 4, the opening 5 is cooled from the viewpoint of preventing burnout due to furnace radiation, reverse gas flow in the furnace, or the like. Although it is necessary, in the conventional boiler, the air is used as combustion air for the duct 8 by a fan (not shown).
And, since it is sent into the furnace 4 through the burner wind box 9, it is not necessary for the above-mentioned original purpose, but the gas recirculation fan 6 is always operated to flow the minimum necessary amount of exhaust gas, The part 5 has to be cooled and thus consumes unnecessary fan power.

【0004】一方、燃焼用空気としてガスタービンの排
ガスが送られてくる排気再燃ボイラにおいては、ガスタ
ービン排ガスが酸素濃度15%vol前後と空気中の2
1%volに比べて低いため、必要酸素量の確保の結
果、ガス量としては非常に多くなる。また、ガスタービ
ンの負荷特性として最低でも70%程度までしか絞れな
いことから、ガス量が大巾に過剰となり安定燃焼の観点
より主バーナ以外から一部逃す必要性を生ずる。
On the other hand, in an exhaust gas reburning boiler in which exhaust gas of a gas turbine is sent as combustion air, the exhaust gas of the gas turbine has an oxygen concentration of around 15% vol and 2 in the air.
Since it is lower than 1% vol, as a result of securing the required oxygen amount, the gas amount becomes very large. Further, since the load characteristic of the gas turbine can be restricted to at least about 70%, the gas amount becomes excessively large, and it becomes necessary to partially escape from other than the main burner from the viewpoint of stable combustion.

【0005】本発明は、このような従来技術の課題を解
決するためになされたもので、排ガス再循環システムを
有するボイラにガスタービンを組合せて排気再燃ボイラ
とし、ボイラの火炉に形成したガス投入用開口部の冷却
はガスタービン排ガスの一部を利用して行い、かつボイ
ラのバーナにとって過剰なガスタービン排ガスは該火炉
のガス投入用開口部より逃がすことができるボイラを提
供することを目的とする。
The present invention has been made in order to solve the problems of the prior art as described above, and a gas turbine is combined with a boiler having an exhaust gas recirculation system to form an exhaust gas reburning boiler, and gas injection formed in a furnace of the boiler is performed. The purpose of the present invention is to provide a boiler in which a part of the gas turbine exhaust gas is used to cool the gas opening, and excess gas turbine exhaust gas for the burner of the boiler can escape from the gas charging opening of the furnace. To do.

【0006】[0006]

【課題を解決するための手段】上記の課題を解決するた
めに、本発明は、排ガスの一部を火炉に形成したガス投
入用開口部に導く排ガス再循環ダクトを有するボイラに
おいて、ガスタービンの排ガスを前記火炉に設けたバー
ナ風箱に導く主ガスダクトから分岐したガスタービン排
ガスダクトを前記火炉のガス投入用開口部又は前記排ガ
ス再循環ダクトに接続したものである。
In order to solve the above problems, the present invention relates to a boiler having an exhaust gas recirculation duct for guiding a part of the exhaust gas to an opening for gas injection formed in a furnace. A gas turbine exhaust gas duct branched from a main gas duct that guides exhaust gas to a burner wind box provided in the furnace is connected to a gas charging opening of the furnace or the exhaust gas recirculation duct.

【0007】[0007]

【作用】上記の手段によれば、ガスタービンコンバイン
ド運転時、排ガス再循環が不要となる運用域において
は、ガスタービン排ガスの一部をボイラ火炉のガス投入
用開口部に供給して冷却し、これによりガス再循環ファ
ンは停止することができる。また、ガスタービン排ガス
がボイラのバーナにとって過剰となる場合には、その一
部を前後ボイラ火炉のガス投入用開口部より逃がすこと
ができる。
According to the above means, in the operation area where exhaust gas recirculation is unnecessary during gas turbine combined operation, a part of the gas turbine exhaust gas is supplied to the gas charging opening of the boiler furnace to be cooled, This allows the gas recirculation fan to stop. Further, when the gas turbine exhaust gas becomes excessive for the burner of the boiler, a part thereof can be escaped from the gas charging opening of the front and rear boiler furnaces.

【0008】[0008]

【実施例】以下、図1を参照して本発明の一実施例につ
いて詳細に説明する。図1は、本実施例に係るボイラを
示す系統図であり、図2に示したものと同一の部分には
同一の符号を付して、重複する説明は省略する。
An embodiment of the present invention will be described in detail below with reference to FIG. FIG. 1 is a system diagram showing a boiler according to the present embodiment. The same parts as those shown in FIG. 2 are designated by the same reference numerals, and a duplicate description will be omitted.

【0009】図1において、ボイラ1の火炉4に設けら
れているバーナ風箱9はガスタービン11と主ガスダク
ト12により接続され、この主ガスダクト12を通して
ガスタービン排ガスが燃焼用空気としてボイラ1のバー
ナ風箱9に供給されるようになっている。そして、この
主ガスダクト12から分岐されたガスタービン排ガスダ
クト13が排ガス再循環ダクト3に接続されていると共
に、このガスタービン排ガスダクト13の途中部分には
流量調整用のダンパ14が設けられている。
In FIG. 1, a burner wind box 9 provided in a furnace 4 of a boiler 1 is connected to a gas turbine 11 by a main gas duct 12, and the gas turbine exhaust gas is burned through the main gas duct 12 as combustion air to the burner of the boiler 1. It is supplied to the wind box 9. The gas turbine exhaust gas duct 13 branched from the main gas duct 12 is connected to the exhaust gas recirculation duct 3, and a damper 14 for adjusting the flow rate is provided in the middle of the gas turbine exhaust gas duct 13. ..

【0010】以上述べた構成において、ガスタービン1
1のコンバインド運転時、排ガス再循環が不要となる運
用域においては、ダンパ14を開き、ダクト13を通し
てガスタービン排ガスの一部をボイラ1の火炉4に形成
されているガス投入用開口部5に供給して冷却すること
ができるので、ガス再循環ファン6は停止し、その出口
のダンパ7も閉じることができる。また、ガスタービン
排ガスがボイラのバーナにとって過剰となる場合には、
その一部を同じくダクト13及びダンパ14を通してボ
イラ火炉4のガス投入用開口部5より逃がすことができ
る。
In the configuration described above, the gas turbine 1
In the operation area where exhaust gas recirculation is unnecessary during the combined operation of No. 1, the damper 14 is opened, and a part of the gas turbine exhaust gas is passed through the duct 13 to the gas injection opening 5 formed in the furnace 4 of the boiler 1. Since it can be supplied and cooled, the gas recirculation fan 6 can be stopped and the damper 7 at its outlet can also be closed. Also, when the gas turbine exhaust gas becomes excessive for the burner of the boiler,
A part thereof can also be released from the gas charging opening 5 of the boiler furnace 4 through the duct 13 and the damper 14.

【0011】なお、図1に示した実施例ではガスタービ
ン排ガスダクト13をボイラ火炉4のガス投入用開口部
5付近で排ガス再循環ダクト3に接続しているが、これ
に代えて、ガスタービン排ガスダクト13を該ガス投入
用開口部5に直接接続してもよいことは勿論である。
In the embodiment shown in FIG. 1, the gas turbine exhaust gas duct 13 is connected to the exhaust gas recirculation duct 3 in the vicinity of the gas charging opening 5 of the boiler furnace 4, but instead of this, the gas turbine is replaced. Needless to say, the exhaust gas duct 13 may be directly connected to the gas injection opening 5.

【0012】[0012]

【発明の効果】以上述べたように、本発明によれば、ボ
イラ火炉への排ガス再循環が不要となるガスタービンコ
ンバインド運転時には、ガスタービン排ガスの一部をボ
イラ火炉のガス投入用開口部に供給して冷却することが
できるので、ガス再循環ファンを停止することが可能と
なり、プラント補機動力を低減することができる。ま
た、ガスタービン排ガスがボイラのバーナにとって過剰
となる場合には、その一部を前記ボイラ火炉のガス投入
用開口部より逃がすことができるので、ボイラのバーナ
開口面積が過大とならず、運転範囲を広くとれる。
As described above, according to the present invention, during the gas turbine combined operation in which the exhaust gas recirculation to the boiler furnace is unnecessary, a part of the gas turbine exhaust gas is supplied to the gas charging opening of the boiler furnace. Since the gas can be supplied and cooled, the gas recirculation fan can be stopped, and the plant auxiliary machine power can be reduced. Also, when the gas turbine exhaust gas becomes excessive for the burner of the boiler, a part of it can be escaped from the gas charging opening of the boiler furnace, so that the burner opening area of the boiler does not become excessive, and the operating range Can be widely used.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の一実施例に係るボイラを示す系統図で
ある。
FIG. 1 is a system diagram showing a boiler according to an embodiment of the present invention.

【図2】従来のボイラを示す系統図である。FIG. 2 is a system diagram showing a conventional boiler.

【符号の説明】[Explanation of symbols]

1 ボイラ 2 排ガスダクト 3 排ガス再循環ダクト 4 火炉 5 ガス投入用開口部 6 ガス再循環ファン 7 ダンパ 9 バーナ 11 ガスタービン 12 主ガスダクト 13 ガスタービン排ガスダクト 14 ダンパ 1 Boiler 2 Exhaust gas duct 3 Exhaust gas recirculation duct 4 Furnace 5 Gas injection opening 6 Gas recirculation fan 7 Damper 9 Burner 11 Gas turbine 12 Main gas duct 13 Gas turbine exhaust gas duct 14 Damper

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】排ガスの一部を火炉に形成したガス投入用
開口部に導く排ガス再循環ダクトを有するボイラにおい
て、ガスタービンの排ガスを前記火炉に設けたバーナ風
箱に導く主ガスダクトから分岐したガスタービン排ガス
ダクトを前記火炉のガス投入用開口部又は前記排ガス再
循環ダクトに接続したことを特徴とするボイラ。
1. A boiler having an exhaust gas recirculation duct for guiding a part of the exhaust gas to a gas injection opening formed in a furnace, wherein the exhaust gas of a gas turbine is branched from a main gas duct for guiding a burner wind box provided in the furnace. A boiler characterized in that a gas turbine exhaust gas duct is connected to a gas injection opening of the furnace or the exhaust gas recirculation duct.
【請求項2】請求項1記載のボイラにおいて、前記ガス
タービン排ガスダクトの途中部分に流量調整用のダンパ
を設けたことを特徴とするボイラ。
2. The boiler according to claim 1, wherein a damper for adjusting a flow rate is provided in an intermediate portion of the gas turbine exhaust gas duct.
JP4075952A 1992-02-28 1992-02-28 boiler Expired - Fee Related JP3035062B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4075952A JP3035062B2 (en) 1992-02-28 1992-02-28 boiler

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4075952A JP3035062B2 (en) 1992-02-28 1992-02-28 boiler

Publications (2)

Publication Number Publication Date
JPH05240407A true JPH05240407A (en) 1993-09-17
JP3035062B2 JP3035062B2 (en) 2000-04-17

Family

ID=13591071

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4075952A Expired - Fee Related JP3035062B2 (en) 1992-02-28 1992-02-28 boiler

Country Status (1)

Country Link
JP (1) JP3035062B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100590829B1 (en) * 2004-12-23 2006-06-19 재단법인 포항산업과학연구원 Regenerative burner system
JP2016173218A (en) * 2015-03-18 2016-09-29 Jfeスチール株式会社 Combustion air supply method for forced draft type boiler and device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100590829B1 (en) * 2004-12-23 2006-06-19 재단법인 포항산업과학연구원 Regenerative burner system
JP2016173218A (en) * 2015-03-18 2016-09-29 Jfeスチール株式会社 Combustion air supply method for forced draft type boiler and device

Also Published As

Publication number Publication date
JP3035062B2 (en) 2000-04-17

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