JPH06129209A - Cogeneration system - Google Patents
Cogeneration systemInfo
- Publication number
- JPH06129209A JPH06129209A JP30767992A JP30767992A JPH06129209A JP H06129209 A JPH06129209 A JP H06129209A JP 30767992 A JP30767992 A JP 30767992A JP 30767992 A JP30767992 A JP 30767992A JP H06129209 A JPH06129209 A JP H06129209A
- Authority
- JP
- Japan
- Prior art keywords
- burner
- exhaust gas
- duct
- gas turbine
- air
- 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
Links
- 239000007789 gas Substances 0.000 claims abstract description 55
- 239000002918 waste heat Substances 0.000 claims abstract description 10
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 5
- 238000009423 ventilation Methods 0.000 claims description 11
- 238000002485 combustion reaction Methods 0.000 abstract description 18
- 230000000284 resting effect Effects 0.000 abstract 3
- 239000000428 dust Substances 0.000 abstract 1
- 239000002699 waste material Substances 0.000 abstract 1
- 238000003303 reheating Methods 0.000 description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000002737 fuel gas Substances 0.000 description 4
- 238000009434 installation Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
- F22B1/1861—Waste heat boilers with supplementary firing
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ガスタービン発電機の
排ガスを熱供給源として利用する所謂コージェネレーシ
ョンシステムに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called cogeneration system that uses exhaust gas from a gas turbine generator as a heat source.
【０００２】[0002]
【従来の技術】一般にコージェネレーションシステムに
おいて、タービンの定期点検やタービントリップ等のた
めにタービンを停止させる必要がある場合、廃熱ボイラ
も高温排ガスが供給されなくなって停止するので、優先
度の高い負荷のために予備ボイラが設けられている。し
かし予備ボイラは、設置コストが高い上に、広いスペー
スを必要とするという問題があった。また一方、コージ
ェネレーションシステムにおいて、蒸気の需要が多い場
合には、追い焚きシステムが採用される。これはガスタ
ービンの高温排ガスを追い焚きバーナで再加熱すること
によって、蒸気発生能力を増大させるものであるが、タ
ービンが停止した時には、再加熱すべき排ガスの供給も
停止するので、追い焚きバーナも停止していた。2. Description of the Related Art Generally, in a cogeneration system, when it is necessary to stop the turbine for periodic inspection of the turbine, turbine trip, etc., the waste heat boiler also stops because high temperature exhaust gas is not supplied, and therefore has a high priority. A spare boiler is provided for the load. However, the backup boiler has a problem that the installation cost is high and a large space is required. On the other hand, in a cogeneration system, when the demand for steam is high, a reheating system is adopted. This is to increase the steam generation capacity by reheating the high temperature exhaust gas of the gas turbine with the reheating burner, but when the turbine stops, the supply of the exhaust gas to be reheated also stops, so the reheating burner Was also stopped.
【０００３】[0003]
【発明が解決しようとする課題】本発明は、予備ボイラ
の稼働させる場合には、廃熱ボイラや追い焚きバーナが
休止している点に着目し、これらを有効に活用すること
によって予備ボイラを不要とし、システムの利用効率を
向上すると共に、コストの低減を図ることを目的とする
ものである。SUMMARY OF THE INVENTION The present invention focuses on the fact that the waste heat boiler and the reburning burner are at rest when operating the spare boiler, and by effectively utilizing these, the spare boiler is It is not intended to improve the system utilization efficiency and reduce the cost.
【０００４】[0004]
【課題を解決するための手段】本発明によるコージェネ
レーションシステムは、図１〜３に示すように、ガスタ
ービン１から廃熱ボイラ２へ供給される排ガスを追い焚
きバーナ３によって再加熱する方式のコージェネレーシ
ョンシステムにおいて、追い焚きバーナ３と該バーナ３
の取付ダクト４の内壁面との間に、排ガスの一部をバイ
パスさせる通気用間隙５を設けると共に、該通気用間隙
５の流量を調節する可動式開閉板６を設け、更に別途設
けたブロア７より該バーナ３へ新鮮常温空気を供給する
ダクト８を、該バーナ３の上流側の排ガスダクト９に合
流せしめたものである。As shown in FIGS. 1 to 3, a cogeneration system according to the present invention is of a system in which exhaust gas supplied from a gas turbine 1 to a waste heat boiler 2 is reheated by a reheating burner 3. In the cogeneration system, the reburning burner 3 and the burner 3
A ventilation gap 5 for bypassing a part of the exhaust gas is provided between the mounting duct 4 and the inner wall surface of the attachment duct 4, and a movable opening / closing plate 6 for adjusting the flow rate of the ventilation gap 5 is further provided. A duct 8 for supplying fresh normal temperature air from 7 to the burner 3 is joined to an exhaust gas duct 9 on the upstream side of the burner 3.
【０００５】[0005]
【作用】追い焚きバーナは、ガスタービンの高温排ガス
（温度：約５００℃, 酸素濃度：約１５％）中の酸素を
使って燃料ガスを燃焼させているが、この排ガス中の酸
素の体積比率は、新鮮常温空気（温度：約３０℃, 酸素
濃度：２１％）の場合の約２８％（=(30+273)/(500+27
3)*15/21）となる。換言すれば、高温排ガス１立方メー
トルに対して、新鮮常温空気０.２８立方メートルで、
追い焚きバーナに同一空気比の燃焼を行わせることがで
き、従って別途設けたブロアによって、ガスタービン停
止時も追い焚きバーナの燃焼分だけは引き続いて廃熱ボ
イラへ熱供給することができる。しかしバーナに供給す
る圧力が変化すると、最適燃焼条件が保てなくなるの
で、上記開閉板を用いて、排ガスの一部をバーナの側方
にバイパスさせ、一方新鮮空気はその殆どをバーナに通
すようにするのである。このときバーナを通らなかった
排ガス中の酸素も、バーナの前方で燃焼に寄与すること
は言うまでもない。[Operation] The reburning burner burns the fuel gas by using oxygen in the high temperature exhaust gas (temperature: about 500 ° C, oxygen concentration: about 15%) of the gas turbine. The volume ratio of oxygen in this exhaust gas is high. Is about 28% (= (30 + 273) / (500 + 27) in the case of fresh room temperature air (temperature: about 30 ° C, oxygen concentration: 21%)
3) * 15/21). In other words, for 1 cubic meter of hot exhaust gas, 0.28 cubic meters of fresh room temperature air,
It is possible to cause the reheating burner to perform combustion with the same air ratio, and therefore the separately provided blower can continuously supply heat to the waste heat boiler only for the combustion amount of the reheating burner even when the gas turbine is stopped. However, if the pressure supplied to the burner changes, optimal combustion conditions cannot be maintained.Therefore, using the above-mentioned opening / closing plate, a part of the exhaust gas is bypassed to the side of the burner, while most of the fresh air passes through the burner. To do. Needless to say, oxygen in the exhaust gas that did not pass through the burner at this time also contributes to combustion in front of the burner.
【０００６】[0006]
【実施例】図１は本発明によるコージェネレーションシ
ステムの一実施例の上面図、図２はその側面図で、ガス
タービン１から廃熱ボイラ２へ高温排ガスを供給する排
ガスダクト９の中間部に追い焚きバーナ３が設けられて
おり、タービン運転中は、この追い焚きバーナ３によ
り、高温排ガス中に多量に（１３〜１５％）含まれてい
る酸素を使って燃料ガスを燃焼（排ガス燃焼）させるこ
とにより、排ガスを再加熱して廃熱ボイラ２に送り、ボ
イラ効率を向上させる。排ガスダクト９の側方に設置さ
れている空気燃焼用ブロア７は、ガスタービン停止時に
運転されるもので、追い焚きバーナ３の上流側で排ガス
ダクト９に合流している空気ダクト８を通して、追い焚
きバーナ３へ燃焼用空気を供給し、燃料ガスを燃焼（空
気燃焼）させるものである。なお図中、１０は廃熱ボイ
ラ２の汽水分離ドラム、１１はエコノマイザである。FIG. 1 is a top view of an embodiment of a cogeneration system according to the present invention, and FIG. 2 is a side view thereof, showing an intermediate portion of an exhaust gas duct 9 for supplying high temperature exhaust gas from a gas turbine 1 to a waste heat boiler 2. A refueling burner 3 is provided, and during the operation of the turbine, the refueling burner 3 burns the fuel gas by using oxygen contained in a large amount (13 to 15%) in the high-temperature exhaust gas (exhaust gas combustion). By doing so, the exhaust gas is reheated and sent to the waste heat boiler 2 to improve the boiler efficiency. The air-combustion blower 7 installed on the side of the exhaust gas duct 9 is operated when the gas turbine is stopped, and is driven through the air duct 8 that joins the exhaust gas duct 9 on the upstream side of the reheating burner 3. Combustion air is supplied to the burning burner 3 to combust fuel gas (air combustion). In the figure, 10 is a brackish water separation drum of the waste heat boiler 2, and 11 is an economizer.
【０００７】図３（ａ）（ｂ）はそれぞれ、追い焚きバ
ーナ部分の正面図及び側断面図を示したもので、追い焚
きバーナ３とバーナ取付ダクト４の内壁面との間に、排
ガスの一部をバイパスさせるための通気用間隙５が設け
られ、可動式開閉板６によって通気用間隙５の流量が加
減できるようになっている。１２は開閉板６を開閉駆動
するためのピストンシリンダである。バーナ３はバーナ
ユニットをダクト幅に亙ってライン状に連結したもので
あり、バーナユニットは図５に示すように、前面にガス
ノズル１３を有するガスチャンバ１４と通気孔１５を有
するウイング１６とで構成され、ガスノズル１３から噴
出した燃料ガスがウイング１６の通気孔１５からタービ
ン排ガスまたは新鮮空気を吸い込んで、ウイング１６内
で保炎され、更にウイング１６の前方で完全燃焼するよ
うになっている。なお上述の実施例は、通気用間隙５を
追い焚きバーナ３の上下及び左右に設けたものである
が、図４の実施例に示すように、通気用間隙５及び可動
式開閉板６を追い焚きバーナ３の上下にのみ、あるいは
左右にのみ設けてもよい。3 (a) and 3 (b) are respectively a front view and a side sectional view of the reburning burner portion, in which exhaust gas is discharged between the reburning burner 3 and the inner wall surface of the burner mounting duct 4. A ventilation gap 5 for bypassing a part is provided, and the flow rate of the ventilation gap 5 can be adjusted by the movable opening / closing plate 6. Reference numeral 12 is a piston cylinder for driving the opening / closing plate 6 to open and close. The burner 3 is formed by connecting the burner units in a line shape across the duct width. As shown in FIG. 5, the burner unit includes a gas chamber 14 having a gas nozzle 13 on the front surface and a wing 16 having a vent hole 15. The fuel gas ejected from the gas nozzle 13 sucks turbine exhaust gas or fresh air from the vent hole 15 of the wing 16, flame-holds in the wing 16, and is completely burned in front of the wing 16. In the above-described embodiment, the ventilation gap 5 is provided above and below and on the left and right of the reburning burner 3. However, as shown in the embodiment of FIG. 4, the ventilation gap 5 and the movable opening / closing plate 6 are added. It may be provided only above and below the burning burner 3 or only on the left and right.
【０００８】図５は、ガスタービン運転時すなわち排ガ
ス燃焼時において開閉板６が開いている状態を示してお
り、このときバーナ間差圧（バーナの前後の圧力差）は
２５〜３０ｍｍＨ2Ｏに保たれている。空気燃焼時は、
排ガス燃焼時に比し流量が数分の１に減少するので、開
閉板６を閉じてバーナ間差圧を維持する必要がある。そ
こで開閉板６を、排ガス運転時において２５〜１６０ｍ
ｍＨ2Ｏの間で調整できるように構成し、試運転時にそ
れぞれ最適の燃焼状態となるように調整するのである。
この開閉板６は、バーナ取付ダクト４の内壁面に基端部
を軸支され、開状態には図６に示すように、先端を下流
側に向けて壁面に密着し、この状態からピストンシリン
ダ１２により閉方向に回動すると、同図に示すように、
開閉板６の先端部がバーナ３のウイング１６の先端部に
接近して、開閉板６とウイング１６とで断面が楔形の空
間を形成するようになっている。従って閉状態では、こ
の楔形の空間に吹き流れ込む空気の大部分が、ウイング
１６に形成されている狭い通気孔１５を通過するように
なり、排ガス燃焼時に比しダクト内の流量が減少したに
も拘らず、ウイング１６内に充分な空気を供給して、火
炎長の短い良好な燃焼を維持することができるのであ
る。FIG. 5 shows a state in which the opening / closing plate 6 is open during operation of the gas turbine, that is, during combustion of exhaust gas. At this time, the differential pressure between the burners (pressure difference before and after the burner) is maintained at 25 to 30 mmH2O. ing. During air combustion,
Since the flow rate is reduced to a fraction of that at the time of combustion of exhaust gas, it is necessary to close the opening / closing plate 6 to maintain the differential pressure between burners. Therefore, the opening / closing plate 6 is set to 25 to 160 m during exhaust gas operation.
It is configured so that it can be adjusted between mH2O, and is adjusted so that the optimum combustion state is obtained during the test operation.
The opening / closing plate 6 has a base end portion axially supported by the inner wall surface of the burner mounting duct 4, and in the open state, as shown in FIG. When it is rotated in the closing direction by 12, as shown in FIG.
The tip of the opening / closing plate 6 approaches the tip of the wing 16 of the burner 3, and the opening / closing plate 6 and the wing 16 form a space having a wedge-shaped cross section. Therefore, in the closed state, most of the air blown into this wedge-shaped space passes through the narrow vent hole 15 formed in the wing 16, which reduces the flow rate in the duct as compared with the time of exhaust gas combustion. Regardless, sufficient air can be supplied into the wings 16 to maintain good combustion with a short flame length.
【０００９】[0009]
【発明の効果】本発明によれば上述のように、ガスター
ビン停止時にも追することができ、その際にタービン運
転時と同等のバーナ間差圧を確保することができるの
で、良好な燃焼条件を維持することができ、従って予備
ボイラを設置する場合に比し、遥かに低コスト且つ小さ
い設置スペースで、タービン運転時と同等若しくはそれ
以上の効果を挙げることができるという利点がある。ま
た開閉板は、ガスタービン運転中は通気用間隙を通る排
ガスによって冷却され、空気燃焼中はウイングの通気孔
に流れ込む低温の空気によって冷却されるので、熱によ
る破損や変形が殆どなく、従ってメンテナンスをあまり
必要としないという利点がある。As described above, according to the present invention, it is possible to follow up even when the gas turbine is stopped, and at that time, it is possible to secure the same differential pressure between burners as when the turbine is operating, so that good combustion is achieved. There is an advantage that the conditions can be maintained, and therefore, an effect equal to or higher than that during turbine operation can be achieved with a much lower cost and a smaller installation space as compared with the case where a backup boiler is installed. Also, since the opening / closing plate is cooled by the exhaust gas passing through the ventilation gap during operation of the gas turbine and cooled by the low temperature air flowing into the ventilation holes of the wings during air combustion, there is almost no damage or deformation due to heat, and therefore maintenance is not required. Has the advantage of not requiring much.
【図１】本発明の一実施例の上面図。FIG. 1 is a top view of an embodiment of the present invention.
【図２】同上の側面図。FIG. 2 is a side view of the same.
【図３】同上の追い焚きバーナ部を示すもので、（ａ）
は正面断面図、（ｂ）は側断面図。[Fig. 3] Fig. 3 is a view showing a reburning burner section of the same as above, (a)
Is a front sectional view, (b) is a side sectional view.
【図４】追い焚きバーナ部の他の実施例を示すもので、
（ａ）は正面断面図、（ｂ）は側断面図。FIG. 4 shows another embodiment of the reburning burner section,
(A) is a front sectional view, (b) is a side sectional view.
【図５】本発明の一実施例における可動式開閉板の開状
態の断面図。FIG. 5 is a sectional view of a movable opening / closing plate in an open state according to an embodiment of the present invention.
【図６】同上の閉状態の断面図。FIG. 6 is a sectional view of the above closed state.
１ ガスタービン ２ 廃熱ボイラ ３ 追い焚きバーナ ４ バーナ取付ダクト ５ 通気用間隙 ６ 可動式開閉板 ７ 空気燃焼用ブロア ８ 空気ダクト ９ 排ガスダクト １０ 汽水分離ドラム １１ エコノマイザ １２ ピストンシリンダ １３ ガスノズル １４ ガスチャンバ １５ 通気孔 １６ ウイング 1 Gas Turbine 2 Waste Heat Boiler 3 Reheating Burner 4 Burner Mounting Duct 5 Ventilation Gap 6 Movable Open / Close Plate 7 Air Combustion Blower 8 Air Duct 9 Exhaust Duct 10 Brackish Water Separation Drum 11 Economizer 12 Piston Cylinder 13 Gas Nozzle 14 Gas Chamber 15 Vent 16 Wings
───────────────────────────────────────────────────── フロントページの続き (72)発明者 梶本 佳宏 大阪市中央区平野町四丁目１番２号 大阪 瓦斯株式会社内 (72)発明者 吉田 誠治 大阪市西区京町堀２丁目４番７号 中外炉 工業株式会社内 (72)発明者 山崎 章信 大阪市西区京町堀２丁目４番７号 中外炉 工業株式会社内 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Yoshihiro Kajimoto 4-1-2, Hirano-cho, Chuo-ku, Osaka, Osaka Gas Co., Ltd. (72) Inventor Seiji Yoshida 2--4-7, Kyomachibori, Nishi-ku, Osaka Chugai Furnace Industry Co., Ltd. (72) Inventor Shonobu Yamazaki 2-4-7 Kyomachibori, Nishi-ku, Osaka City Chugai Furnace Industry Co., Ltd.
Claims (1)
る排ガスを追い焚きバーナによって再加熱する方式のコ
ージェネレーションシステムにおいて、追い焚きバーナ
と該バーナの取付ダクトの内壁面との間に、排ガスの一
部をバイパスさせる通気用間隙を設けると共に、該通気
用間隙の流量を調節する可動式開閉板を設け、更に別途
設けられたブロアより該バーナへ新鮮常温空気を供給す
るダクトを、該バーナの上流側の排ガスダクトに合流せ
しめて成ることを特徴とするコージェネレーションシス
テム。1. In a cogeneration system of a type in which exhaust gas supplied from a gas turbine to a waste heat boiler is reheated by a reburning burner, exhaust gas between the reburning burner and an inner wall surface of a mounting duct of the burner is exhausted. A ventilation gap for bypassing a part of the burner is provided, a movable opening / closing plate for adjusting the flow rate of the ventilation gap is provided, and a duct for supplying fresh normal temperature air to the burner from a separately provided blower is installed in the burner. A cogeneration system characterized by being joined to an exhaust gas duct on the upstream side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4307679A JP2967314B2 (en) | 1992-10-20 | 1992-10-20 | Cogeneration system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4307679A JP2967314B2 (en) | 1992-10-20 | 1992-10-20 | Cogeneration system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06129209A true JPH06129209A (en) | 1994-05-10 |
| JP2967314B2 JP2967314B2 (en) | 1999-10-25 |
Family
ID=17971935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4307679A Expired - Lifetime JP2967314B2 (en) | 1992-10-20 | 1992-10-20 | Cogeneration system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2967314B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006110584A (en) * | 2004-10-13 | 2006-04-27 | Electric Power Dev Co Ltd | Metal casting system |
-
1992
- 1992-10-20 JP JP4307679A patent/JP2967314B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006110584A (en) * | 2004-10-13 | 2006-04-27 | Electric Power Dev Co Ltd | Metal casting system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2967314B2 (en) | 1999-10-25 |
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