JPH0953801A - Starting method for exhaust re-combustion type composite plant - Google Patents
Starting method for exhaust re-combustion type composite plantInfo
- Publication number
- JPH0953801A JPH0953801A JP20698295A JP20698295A JPH0953801A JP H0953801 A JPH0953801 A JP H0953801A JP 20698295 A JP20698295 A JP 20698295A JP 20698295 A JP20698295 A JP 20698295A JP H0953801 A JPH0953801 A JP H0953801A
- Authority
- JP
- Japan
- Prior art keywords
- boiler
- pressure
- feed water
- stop valve
- gas
- 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
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 7
- 239000002131 composite material Substances 0.000 title claims abstract description 4
- 238000000034 method Methods 0.000 title description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- 238000010025 steaming Methods 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims description 67
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 239000008400 supply water Substances 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 238000010304 firing Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 230000006698 induction Effects 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000007704 transition Effects 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]
Landscapes
- Engine Equipment That Uses Special Cycles (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はガスタービンの排気
をボイラの燃焼用空気として熱回収する複合プラントの
起動方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for starting a combined plant in which exhaust gas of a gas turbine is recovered as heat for combustion air of a boiler.
【０００２】[0002]
【従来の技術】図２は従来の排気再燃型複合プラントの
一例を示す系統図である。従来はガスタービン（１）の
出口に排気筒を設置し、ガスタービン系と汽力系を、別
々に起動して、おのおのの単独運転から複合運転に切換
えるか、排気筒がない場合にはボイラを先に起動して、
ある程度負荷を取ったのち、ガスタービンを起動してい
た。これらの場合、いずれも押込通風機（ＦＤＦ）を用
いボイラを起動する必要があった。2. Description of the Related Art FIG. 2 is a system diagram showing an example of a conventional exhaust gas reburn type combined plant. Conventionally, an exhaust stack is installed at the outlet of the gas turbine (1), and the gas turbine system and steam power system are started separately, and each is switched from individual operation to combined operation, or if there is no exhaust stack, the boiler is installed. Start first,
After taking some load, the gas turbine was started. In all of these cases, it was necessary to start the boiler using a forced draft fan (FDF).
【０００３】すなわち、ユニット起動時にガスタービン
単独運転を行なう場合には、ガスタービン出口に排気筒
を設置し、更にその排気筒の出口に脱硝装置を設けるこ
とが必要となる。この時、排気筒のダンパ（１３）を開
き、ガスタービン出口〜ボイラ間に設置されたダンパ
（１０）は閉じる。That is, when the gas turbine is operated independently when the unit is started, it is necessary to install an exhaust pipe at the outlet of the gas turbine and further provide a denitration device at the outlet of the exhaust pipe. At this time, the damper (13) of the exhaust stack is opened, and the damper (10) installed between the gas turbine outlet and the boiler is closed.
【０００４】次に空気予熱器（ＡＨ），押込通風機（Ｆ
ＤＦ）を使用して蒸気タービン，ボイラ系統を起動する
ためには、ガスタービン出口ダンパ（１０）を閉じると
共にガスクーラ系をダンパ（１１）によって系統より切
離す必要がある。これと同時に空気予熱器入口ダンパ
（１２）を開き、脱硝装置出口より空気予熱器（ＡＨ）
側へボイラ排ガスを導く。ボイラの昇温，昇圧後は押込
通風機（ＦＤＦ）を徐々に絞り、Ｏ2 源をガスタービン
出口排ガスに切換える。（ダンパ（１２），（１３）を
閉じダンパ（１０），（１１）を開く。）このようにボ
イラを単独で起動するためには、燃焼用空気が必要とな
るので、押込送風機（ＦＤＦ）を別途設けることが必要
であり、更にガスクーラを経由せずにボイラからの排ガ
スを大気に出すため、従来の通常のボイラと同様に空気
予熱器（ＡＨ），誘引送風機（ＩＤＦ），煙突を設ける
必要がある。Next, the air preheater (AH) and the forced draft fan (F)
In order to start the steam turbine / boiler system using DF), it is necessary to close the gas turbine outlet damper (10) and disconnect the gas cooler system from the system by the damper (11). At the same time, the air preheater inlet damper (12) is opened, and the air preheater (AH) is opened from the denitration device outlet.
Guide the boiler exhaust gas to the side. After raising the temperature and pressure of the boiler, the forced draft fan (FDF) is gradually throttled to switch the O 2 source to the exhaust gas from the gas turbine outlet. (The dampers (12) and (13) are closed and the dampers (10) and (11) are opened.) In order to start the boiler alone in this way, combustion air is required, so a forced draft fan (FDF) is used. It is necessary to install a separate air conditioner, and in order to discharge the exhaust gas from the boiler to the atmosphere without passing through the gas cooler, an air preheater (AH), an induction blower (IDF), and a chimney are installed as in a conventional normal boiler. There is a need.
【０００５】[0005]
【発明が解決しようとする課題】従来、ガスタービンを
先に起動する時は、コンバインド運転へ移行するまでの
間、ガスタービンの排気が直接大気へ放出されることが
あったが、公害規制が厳しくなり起動時でも未処理のガ
スを大気放出できない状況となっており、脱硝装置が必
要である。またボイラを先に起動する場合、通常運転時
に押込通風機や起動用のファンを使用する必要がなくと
も、ボイラの先行的な起動のために、空気予熱器，押込
通風機等を使用せざるを得ないことになる。Conventionally, when the gas turbine is first started, the exhaust gas of the gas turbine may be directly emitted to the atmosphere until the transition to the combined operation. As the situation becomes severe and unprocessed gas cannot be released to the atmosphere at the time of startup, a denitration device is required. When starting the boiler first, even if it is not necessary to use a forced draft fan or a startup fan during normal operation, an air preheater, forced draft fan, etc. must be used to start the boiler in advance. Will not get.
【０００６】そこでガスタービンとボイラを同時に起動
することが望ましいが、図２に示される従来の系統によ
って起動を行なう場合には、高圧ガスクーラ（４）にお
いて給水が加熱されて蒸発してしまう可能性がある。本
発明は、この高圧ガスクーラ（４）における給水の蒸発
を防止しつつ、起動する方法を提案するものである。Therefore, it is desirable to start the gas turbine and the boiler at the same time. However, when starting by the conventional system shown in FIG. 2, the feed water may be heated and evaporated in the high pressure gas cooler (4). There is. The present invention proposes a method of starting while preventing evaporation of feed water in the high pressure gas cooler (4).
【０００７】[0007]
【課題を解決するための手段】本発明者は、前記従来の
課題を解決するために、給水を蒸気で加熱する高圧給水
ヒータとボイラ排ガスで加熱する高圧ガスクーラとがボ
イラ給水系に並列に設置され、かつガスタービン排気中
の残存酸素をボイラの燃焼用に用いる排気再燃型複合プ
ラントにおいて、上記高圧ガスクーラの給水出口に止め
弁を設け、起動に際しては、上記止め弁を閉じ、その上
流の給水圧力をボイラ側残圧よりも高く、起動時のガス
熱吸収に対してスチーミングしない圧力に設定した状態
で、上記ガスタービンおよびボイラを順次点火して、上
記高圧給水ヒータから低温の給水をボイラに供給し、ボ
イラ昇圧によりボイラ側の圧力が給水側とバランスした
時点で上記止め弁を開いて、上記高圧給水ヒータと高圧
ガスクーラから同時に連続して給水を供給することを特
徴とする排気再燃型複合プラントの起動方法を提案する
ものである。In order to solve the above-mentioned conventional problems, the present inventor installed a high-pressure water heater for heating feed water with steam and a high-pressure gas cooler for heating boiler exhaust gas in parallel in a boiler water supply system. In the exhaust gas reburning type combined plant that uses the residual oxygen in the gas turbine exhaust gas for combustion of the boiler, a stop valve is provided at the water supply outlet of the high-pressure gas cooler. With the pressure higher than the residual pressure on the boiler side and set to a pressure that does not steam the gas heat absorption at start-up, the gas turbine and boiler are ignited sequentially, and low-temperature water is supplied from the high-pressure water heater to the boiler. When the boiler pressure rises and the boiler side pressure balances with the water supply side, the stop valve is opened and the high pressure water heater and high pressure gas cooler It proposes a method of starting repowering composite plant and supplying the water continuously to.
【０００８】本発明の方法によれば上記のとおり、起動
に際して、高圧ガスクーラの給水出口に設けられた止め
弁を閉じ、その上流の給水圧力をボイラ側残圧よりも高
く、起動時のガス熱吸収に対してスチーミングしない圧
力に設定した状態で、上記ガスタービンおよびボイラを
順次点火して、上記高圧給水ヒータから低温の給水をボ
イラに供給するので、ボイラ側の残圧が低い場合にも高
圧ガスクーラのスチーミングが防止される。またボイラ
昇圧によりボイラ側の圧力が給水側とバランスし、両系
統の圧力がほぼ等しくなった時点で上記止め弁を開い
て、上記高圧給水ヒータと高圧ガスクーラから同時に連
続して給水を供給するので、外乱が少なく円滑な起動が
可能となる。According to the method of the present invention, as described above, at the time of startup, the stop valve provided at the feed water outlet of the high-pressure gas cooler is closed, the feed water pressure upstream thereof is higher than the residual pressure on the boiler side, and the gas heat at startup is Since the gas turbine and the boiler are sequentially ignited and low-temperature feed water is supplied to the boiler from the high-pressure feed water heater in a state where the pressure is set to prevent steaming for absorption, even when the residual pressure on the boiler side is low. Steaming of the high pressure gas cooler is prevented. In addition, the pressure on the boiler side is balanced with the water supply side by boosting the boiler, and when the pressures on both systems become approximately equal, the stop valve is opened and water is supplied continuously from the high pressure water heater and high pressure gas cooler at the same time. As a result, there is little disturbance and smooth startup is possible.
【０００９】[0009]
【発明の実施の形態】図１は本発明の実施の一形態を示
す系統図である。本実施形態では、高圧ガスクーラ
（４）の給水出口に止め弁（７）が設けられる。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a system diagram showing an embodiment of the present invention. In this embodiment, a stop valve (7) is provided at the water supply outlet of the high pressure gas cooler (4).
【００１０】この複合プラントを起動するに際しては、
まず高圧ガスクーラ（４）の給水系をボイラ残圧よりも
高圧で高圧ガスクーラ（４）でスチーミングを起こさな
い圧力に保持し、止め弁（７）を閉じることによってボ
イラ系と給水系を切離した状態で、ガスタービン（１）
とボイラ（２）に点火する。その場合、給水はドラムレ
ベル調節弁（６）を介して間欠的に給水する。また高圧
ガスクーラ（４）通過後の給水は、再循環流量調節弁
（８）を経由して復水器へ再循環させる。When starting this complex plant,
First, the water supply system of the high-pressure gas cooler (4) was kept at a pressure higher than the residual pressure of the boiler so that steaming did not occur in the high-pressure gas cooler (4), and the stop valve (7) was closed to disconnect the boiler system and the water supply system. Gas turbine in the state (1)
Ignite the boiler (2). In that case, water is intermittently supplied through the drum level control valve (6). Further, the water supply after passing through the high-pressure gas cooler (4) is recirculated to the condenser via the recirculation flow rate control valve (8).
【００１１】点火後はドラムレベル調節弁（６）により
ボイラドラムへ給水を供給しつつボイラ（２）を昇圧し
てゆく。そしてボイラ（２）と高圧ガスクーラ（４）の
圧力が一致した時点で、止め弁（７）を全開にすること
により、高圧給水ヒータ（３）側と高圧ガスクーラ
（４）側の両系統から並行してボイラ（１）に給水する
系統が確立される。After the ignition, the drum level control valve (6) supplies water to the boiler drum while boosting the pressure of the boiler (2). Then, when the pressures of the boiler (2) and the high-pressure gas cooler (4) match, the stop valve (7) is fully opened so that the high-pressure water heater (3) side and the high-pressure gas cooler (4) side are connected in parallel. Then, a system for supplying water to the boiler (1) is established.
【００１２】その後は従来の一般的なボイラと同様に昇
圧する。なお、止め弁（７）を開いた後は、ドラムレベ
ルの制御を起動用のドラムレベル調節弁（６）から常用
のドラムレベル調節弁（９）に切換えるとともに、高圧
ガスクーラ（４）側に十分な給水を供給するため、再循
環流量調節弁（８）を用いて、高圧ガスクーラ（４）出
口の給水の温度を制御する。ボイラ給水の温度が高くな
れば節炭器のスチーミングが懸念されるからである。特
に低負荷時や起動時はガスタービンの排ガス量が一定と
なるため、ボイラ給水温度（高圧ガスクーラ出口給水温
度）が高めになり、再循環流量調節弁（８）が開く。After that, the pressure is increased similarly to the conventional general boiler. After the stop valve (7) is opened, the drum level control is switched from the starting drum level control valve (6) to the regular drum level control valve (9), and the high pressure gas cooler (4) side is sufficiently operated. In order to supply sufficient supply water, the temperature of the supply water at the outlet of the high pressure gas cooler (4) is controlled by using the recirculation flow rate control valve (8). This is because steaming of the economizer may be concerned if the temperature of the boiler feedwater rises. Especially when the load is low or when starting, the amount of exhaust gas from the gas turbine becomes constant, so the boiler feed water temperature (high-pressure gas cooler outlet feed water temperature) becomes high, and the recirculation flow rate control valve (8) opens.
【００１３】[0013]
【発明の効果】従来は、起動時にガスタービンの排ガス
を公害規制値内に処理するため、別途脱硝装置等の排ガ
ス処理系を設けるか、またはボイラを先行的に起動する
場合には空気予熱器や押込通風機等をプラント起動のた
めだけに設ける必要があった。In the prior art, in order to treat the exhaust gas of the gas turbine within the pollution control value at the time of startup, an exhaust gas treatment system such as a denitration device is separately provided, or an air preheater is used when the boiler is started in advance. It was necessary to install a forced draft fan and a forced draft fan only for starting the plant.
【００１４】本発明によれば、ガスタービン排気筒の排
ガス処理を常用の設備で行なうことができる。また空気
予熱器，押込通風機等の補機をプラントの起動時のみ運
転する必要がなくなり、ガスタービン排ガスのみを用い
た起動が可能となる。これにより、空気予熱器やファン
等の設備が不要となり、また起動損失を減少し、起動時
間を短縮する。According to the present invention, the exhaust gas treatment of the gas turbine exhaust stack can be carried out by the usual equipment. Further, it is not necessary to operate auxiliary equipment such as an air preheater and a forced draft fan only when the plant is started, and it is possible to start using only the gas turbine exhaust gas. This eliminates the need for equipment such as an air preheater and a fan, reduces start-up loss, and shortens start-up time.
【図１】図１は本発明の実施の一形態を示す系統図であ
る。FIG. 1 is a system diagram showing an embodiment of the present invention.
【図２】図２は従来の排気再燃型複合プラントの一例を
示す系統図である。FIG. 2 is a system diagram showing an example of a conventional exhaust gas reburn type combined plant.
（１） ガスタービン （２） ボイラ （３） 高圧給水ヒータ （４） 高圧ガスクーラ （６） ドラムレベル調節弁（起動用） （７） 止め弁 （８） 再循環流量調節弁 （９） ドラムレベル調節弁（常用） (10),(11),(12),(13) ダンパ （ＡＨ） 空気予熱器 （ＦＤＦ） 押込通風機 （ＩＤＦ） 誘引通風機 (1) Gas turbine (2) Boiler (3) High-pressure water heater (4) High-pressure gas cooler (6) Drum level control valve (for start-up) (7) Stop valve (8) Recirculation flow control valve (9) Drum level control Valve (regular) (10), (11), (12), (13) Damper (AH) Air preheater (FDF) Push fan (IDF) Induction fan
Claims (1)
ボイラ排ガスで加熱する高圧ガスクーラとがボイラ給水
系に並列に設置され、かつガスタービン排気中の残存酸
素をボイラの燃焼用に用いる排気再燃型複合プラントに
おいて、上記高圧ガスクーラの給水出口に止め弁を設
け、起動に際しては、上記止め弁を閉じ、その上流の給
水圧力をボイラ側残圧よりも高く、起動時のガス熱吸収
に対してスチーミングしない圧力に設定した状態で、上
記ガスタービンおよびボイラを順次点火して、上記高圧
給水ヒータから低温の給水をボイラに供給し、ボイラ昇
圧によりボイラ側の圧力が給水側とバランスした時点で
上記止め弁を開いて、上記高圧給水ヒータと高圧ガスク
ーラから同時に連続して給水を供給することを特徴とす
る排気再燃型複合プラントの起動方法。1. A high-pressure feed water heater for heating feed water with steam and a high-pressure gas cooler for heating boiler exhaust gas are installed in parallel in a boiler feed water system, and the residual oxygen in the gas turbine exhaust is used for combustion of the boiler. Type combined plant, a stop valve is provided at the water supply outlet of the high-pressure gas cooler, and at the time of start, the stop valve is closed, and the water supply pressure upstream of the stop valve is higher than the residual pressure on the boiler side to prevent gas heat absorption at the time of start. With the pressure set to prevent steaming, the gas turbine and boiler are ignited sequentially, low-temperature feed water is supplied to the boiler from the high-pressure feed water heater, and when the boiler pressure boosts the boiler side pressure to the feed side. An exhaust gas re-combustion type composite plastic, characterized in that the stop valve is opened to supply water continuously from the high-pressure water heater and the high-pressure gas cooler at the same time. How to start the event.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07206982A JP3117392B2 (en) | 1995-08-14 | 1995-08-14 | Start-up method of an exhaust gas re-combustion complex plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07206982A JP3117392B2 (en) | 1995-08-14 | 1995-08-14 | Start-up method of an exhaust gas re-combustion complex plant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0953801A true JPH0953801A (en) | 1997-02-25 |
| JP3117392B2 JP3117392B2 (en) | 2000-12-11 |
Family
ID=16532225
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07206982A Expired - Fee Related JP3117392B2 (en) | 1995-08-14 | 1995-08-14 | Start-up method of an exhaust gas re-combustion complex plant |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3117392B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007170705A (en) * | 2005-12-20 | 2007-07-05 | Public Works Research Institute | Pressurized fluidized incineration equipment and its startup method |
-
1995
- 1995-08-14 JP JP07206982A patent/JP3117392B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007170705A (en) * | 2005-12-20 | 2007-07-05 | Public Works Research Institute | Pressurized fluidized incineration equipment and its startup method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3117392B2 (en) | 2000-12-11 |
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