JPH0515921B2 - - Google Patents
Info
- Publication number
- JPH0515921B2 JPH0515921B2 JP3766185A JP3766185A JPH0515921B2 JP H0515921 B2 JPH0515921 B2 JP H0515921B2 JP 3766185 A JP3766185 A JP 3766185A JP 3766185 A JP3766185 A JP 3766185A JP H0515921 B2 JPH0515921 B2 JP H0515921B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- exhaust gas
- steam
- economizer
- gas boiler
- 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 - Lifetime
Links
- 238000010248 power generation Methods 0.000 claims description 4
- 239000008400 supply water Substances 0.000 claims 1
- 238000001816 cooling Methods 0.000 description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000003213 activating effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Landscapes
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、排ガスボイラ発電装置に関し、特
に、ガスタービン排ガスボイラの強制冷却システ
ムに関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an exhaust gas boiler power generation device, and more particularly to a forced cooling system for a gas turbine exhaust gas boiler.
従来の技術
従来のボイラにおいては、強圧送風機を装備し
ているため、ボイラ停止後はその送風機によつて
ボイラの冷却を行なえたが、ガスタービン排ガス
ボイラにはそのような冷却手段を持たないので、
排ガスボイラを急速冷却するための効果的な冷却
方法が必要であつた。Conventional technology Conventional boilers are equipped with a high-pressure blower and can be used to cool the boiler after the boiler has stopped, but gas turbine exhaust gas boilers do not have such cooling means. ,
There was a need for an effective cooling method to rapidly cool exhaust gas boilers.
発明が解決しようとする問題点
本発明は、上記事情にかんがみてなされたもの
で、排ガスボイラを急速に冷却する手段を備えた
排ガスボイラ発電装置を目的とする。Problems to be Solved by the Invention The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide an exhaust gas boiler power generation device equipped with means for rapidly cooling an exhaust gas boiler.
問題点を解決するための手段
本発明によれば、排ガスボイラ出口の主蒸気管
の途中で復水器へ連通させる系のタービンバイパ
ス弁と節炭器再循環系の節炭器再循環弁とを、排
ガスボイラ停止後に、規定の蒸気圧力降下となる
よう制御すると共に規定の節炭器出口水温度降下
となるよう制御することで、ガスタービン排ガス
ボイラの強制冷却が達成される。Means for Solving the Problems According to the present invention, a turbine bypass valve in a system communicating with a condenser and an economizer recirculation valve in an economizer recirculation system are provided in the middle of the main steam pipe at the exhaust gas boiler outlet. After the exhaust gas boiler is stopped, forced cooling of the gas turbine exhaust gas boiler is achieved by controlling it so that the steam pressure drops to a specified value and the water temperature at the exit of the economizer to a specified value.
作 用
蒸気タービン起動時には、蒸気タービンの最低
保持圧力になるようタービンバイパス弁を制御
し、通常運転時にはこのガスタービンバイパス弁
は全閉に制御されている。排ガスボイラの強制冷
却時には、ボイラ停止後すなわちガスタービン停
止後、排ガスボイラの主蒸気管の蒸気圧力を検出
してタービンバイパス弁を規定の圧力降下になる
よう制御する。これによつて、その圧力にみあう
温度まで主蒸気管の冷却が行なわれる。Operation When starting the steam turbine, the turbine bypass valve is controlled to maintain the minimum pressure of the steam turbine, and during normal operation, the gas turbine bypass valve is controlled to be fully closed. During forced cooling of the exhaust gas boiler, after the boiler is stopped, that is, after the gas turbine is stopped, the steam pressure in the main steam pipe of the exhaust gas boiler is detected and the turbine bypass valve is controlled to achieve a specified pressure drop. This cools the main steam pipe to a temperature that matches the pressure.
加えて、節炭器再循環系統の節炭器出口水温度
を検出して冷却速度にみあつた開度信号を節炭器
再循環弁に与えることで、節炭器再循環系統の冷
却が行なわれる。 In addition, by detecting the temperature of the water at the outlet of the economizer in the economizer recirculation system and giving an opening signal that matches the cooling rate to the economizer recirculation valve, the cooling of the economizer recirculation system can be improved. It is done.
実施例
以下添付図面に例示した本発明の好適な実施例
について詳述する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail as illustrated in the accompanying drawings.
第１図は本発明による装置の構成を示したもの
で、図中、符号１は排ガスボイラ本体、２は過熱
器、３は高圧蒸発器、４は低圧蒸発器、５は節炭
器、６は高圧蒸気管、７は低圧蒸気管、８は節炭
器再循環系統、９は高圧止弁、１０は低圧止弁、
１１は高圧タービン、１２は低圧タービン、１３
は復水器、１４は復水ポンプ、１５は高圧タービ
ンバイパス弁、１６は低圧タービンバイパス弁、
１７は主蒸気圧力制御装置、１８は節炭器再循環
弁をそれぞれ示している。 FIG. 1 shows the configuration of an apparatus according to the present invention, in which reference numeral 1 is the exhaust gas boiler main body, 2 is a superheater, 3 is a high-pressure evaporator, 4 is a low-pressure evaporator, 5 is an economizer, and 6 is a high-pressure evaporator. is a high pressure steam pipe, 7 is a low pressure steam pipe, 8 is an economizer recirculation system, 9 is a high pressure stop valve, 10 is a low pressure stop valve,
11 is a high pressure turbine, 12 is a low pressure turbine, 13
is a condenser, 14 is a condensate pump, 15 is a high pressure turbine bypass valve, 16 is a low pressure turbine bypass valve,
Reference numeral 17 indicates a main steam pressure control device, and reference numeral 18 indicates an economizer recirculation valve.
排ガスボイラ停止時は、高圧止弁９および低圧
止弁１０が全閉となり、排ガスボイラ強制冷却を
指示する信号が主蒸気圧力制御装置１７に与えら
れる。主蒸気圧力制御装置１７は高圧蒸気管６お
よび低圧蒸気管７より現在の蒸気系圧力POを検
出し、設定された冷却完了時の最低圧力PMから
蒸気圧力降下率α（Kg・cm2／分）＝PO−PM）／Ｔ
（Ｔは時間）を自動設定し、この蒸気圧力降下率
αになるよう高圧タービンバイパス弁１５および
低圧タービンバイパス弁１６の開度を制御し、主
蒸気管すなわち高圧蒸気管６および低圧蒸気管７
の蒸気圧力を降下させる。この結果、排ガスボイ
ラ本体１内の過熱器２、高圧蒸発器３および低圧
蒸発器４はその圧力にみあつた飽和温度となるた
め、設定最低圧力値に対応した強制冷却が可能と
なる。この主蒸気系統の圧力制御動作を詳細に示
せば、第２図のようになる。 When the exhaust gas boiler is stopped, the high pressure stop valve 9 and the low pressure stop valve 10 are fully closed, and a signal instructing forced cooling of the exhaust gas boiler is given to the main steam pressure control device 17. The main steam pressure control device 17 detects the current steam system pressure P O from the high pressure steam pipe 6 and the low pressure steam pipe 7, and calculates the steam pressure drop rate α (Kg・cm 2 ) from the set minimum pressure P M at the completion of cooling. /min)=P O −P M )/T
(T is time) is automatically set, and the opening degrees of the high pressure turbine bypass valve 15 and the low pressure turbine bypass valve 16 are controlled to achieve this steam pressure drop rate α, and the main steam pipe, that is, the high pressure steam pipe 6 and the low pressure steam pipe 7
decreases the steam pressure of As a result, the superheater 2, high-pressure evaporator 3, and low-pressure evaporator 4 in the exhaust gas boiler main body 1 reach a saturation temperature that matches the pressure, so that forced cooling corresponding to the set minimum pressure value becomes possible. The pressure control operation of this main steam system is shown in detail in FIG. 2.
第２図において、復水器真空が正常であり、最
低圧力PMが設定されていて現在の蒸気系圧力PO
を検出することで蒸気圧力降下率αが設定されて
いるところに、排ガスボイラ停止信号および強制
冷却“自動操作”信号が入力されれば、まず、タ
ービンバイパス弁をその最小開度に保持して、蒸
気系圧力を少し変化させる。次いで、蒸気系圧力
降下率を監視しながらタービンバイパス弁を作動
させて、これによる圧力変化率が規定値以内にあ
るかどうかを判定する。圧力変化率が規定値以内
になければタービンバイパス弁の開度変更を行な
い、規定値以内にあれば現在の圧力が最低圧力か
どうかを判定する。最低圧力になければ、再度タ
ービンバイパス弁を作動させて圧力変化率および
最低圧力の判定を繰り返していき、最低圧力に達
すれば、蒸気系統の強制冷却が完了したことにな
り、タービンバイパス弁は閉にされる。 In Figure 2, the condenser vacuum is normal, the minimum pressure P M is set, and the current steam system pressure P O
If the exhaust gas boiler stop signal and forced cooling "automatic operation" signal are input while the steam pressure drop rate α is set by detecting the , slightly change the steam system pressure. Next, the turbine bypass valve is operated while monitoring the steam system pressure drop rate, and it is determined whether the resulting pressure change rate is within a specified value. If the pressure change rate is not within the specified value, the opening degree of the turbine bypass valve is changed, and if it is within the specified value, it is determined whether the current pressure is the minimum pressure. If the minimum pressure is not reached, the turbine bypass valve is operated again and the pressure change rate and minimum pressure are repeatedly determined. When the minimum pressure is reached, forced cooling of the steam system is completed, and the turbine bypass valve is closed. be made into
節炭器系統においては、排ガスボイラ強制冷却
を指示する信号を受けると主蒸気圧力制御装置１
７が節炭器再循環系統８より現在の節炭器出口水
温度tOを検出し、設定された冷却完了時の温度tM
から温度降下率β（℃／分）＝（tO−tM）／Ｔを自
動設定し、この温度降下率βになるよう節炭器再
循環弁１８の開度を制御する。この制御の詳細を
第３図に示す。 In the energy saving system, when a signal instructing forced cooling of the exhaust gas boiler is received, the main steam pressure control device 1
7 detects the current economizer outlet water temperature t O from the economizer recirculation system 8 and sets the temperature t M at the set completion of cooling.
The temperature drop rate β (° C./min) = (t O −t M )/T is automatically set from , and the opening degree of the economizer recirculation valve 18 is controlled so as to achieve this temperature drop rate β. Details of this control are shown in FIG.
第３図において、復水器真空が正常であり、冷
却温度tOが設定されていて現在の節炭器出口水温
度tMが検出されることで温度降下率βが自動設定
されているところに、排ガスボイラ停止信号およ
び強制冷却“自動操作”信号が入力されれば、ま
ず節炭器再循環弁をその最小開度に保持して、節
炭器出口水温度の変化および変化率を監視する。
次いで節炭器再循環弁を作動させて、これによる
温度変化率が規定値以内にあるかどうかを判定
し、規定値以内になければ節炭器再循環弁の開度
変更を行ない、規定値以内にあれば現在の温度が
冷却温度に達したかどうかを判定し、その冷却温
度に達するまで、節炭器再循環弁を作動させる操
作を繰り返す。冷却温度に達すれば、節炭器再循
環弁は閉にされて、この節炭器系の冷却が終了す
る。このように、主蒸気圧力制御装置１７は冷却
速度にみあつた開度信号を節炭器再循環弁１８に
与えて、節炭器５内の復水器１３、復水ポンプ１
４および節炭器再循環系８の間のクローズドサイ
クルとして冷却することができる。 In Figure 3, the condenser vacuum is normal, the cooling temperature tO is set, and the temperature drop rate β is automatically set by detecting the current economizer outlet water temperature tM . When the exhaust gas boiler stop signal and forced cooling “automatic operation” signal are input, the economizer recirculation valve is first held at its minimum opening and the change and rate of change of the economizer outlet water temperature is monitored. do.
Next, the economizer recirculation valve is operated, and it is determined whether the temperature change rate due to this is within the specified value. If it is not within the specified value, the opening degree of the economizer recirculation valve is changed, and the temperature change rate is determined to be within the specified value. If the current temperature is within the range, it is determined whether the current temperature has reached the cooling temperature, and the operation of activating the economizer recirculation valve is repeated until the current temperature reaches the cooling temperature. Once the cooling temperature is reached, the economizer recirculation valve is closed, terminating the cooling of the economizer system. In this way, the main steam pressure control device 17 gives an opening signal that matches the cooling rate to the economizer recirculation valve 18 to control the condenser 13 in the economizer 5 and the condensate pump 1.
4 and the economizer recirculation system 8 as a closed cycle.
発明の効果
本発明によれば、タービンバイパス弁および節
炭器再循環弁を蒸気タービン運転停止後に開いて
主蒸気管の圧力を低下させると共に節炭器に給水
を循環させることで、ガスタービン排ガスボイラ
を強制的に冷却することができるようになつた。Effects of the Invention According to the present invention, the turbine bypass valve and the economizer recirculation valve are opened after the steam turbine operation is stopped to reduce the pressure in the main steam pipe and circulate the feed water to the economizer, thereby reducing gas turbine exhaust gas. It is now possible to forcefully cool the boiler.
第１図は本発明によるガスタービン排ガスボイ
ラ発電装置の構成を示す図、第２図は主蒸気圧力
制御のフローチヤート、第３図は節炭器系統の制
御のフローチヤートである。
１……排ガスボイラ本体、２……過熱器、３…
…高圧蒸発器、４……低圧蒸発器、５……節炭
器、６……高圧蒸気管、７……低圧蒸気管、８…
…節炭器再循環系統、９……高圧止弁、１０……
低圧止弁、１１……高圧タービン、１２……低圧
タービン、１３……復水器、１４……復水ポン
プ、１５……高圧タービンバイパス弁、１６……
低圧タービンバイパス弁、１７……主蒸気圧力制
御装置、１８……節炭器再循環弁。
FIG. 1 is a diagram showing the configuration of a gas turbine exhaust gas boiler power generation system according to the present invention, FIG. 2 is a flowchart of main steam pressure control, and FIG. 3 is a flowchart of control of the economizer system. 1...Exhaust gas boiler main body, 2...Superheater, 3...
...High pressure evaporator, 4...Low pressure evaporator, 5...Economy device, 6...High pressure steam pipe, 7...Low pressure steam pipe, 8...
... Economizer recirculation system, 9 ... High pressure stop valve, 10 ...
Low pressure stop valve, 11... High pressure turbine, 12... Low pressure turbine, 13... Condenser, 14... Condensate pump, 15... High pressure turbine bypass valve, 16...
Low pressure turbine bypass valve, 17... Main steam pressure control device, 18... Economizer recirculation valve.
Claims (1)
気タービンに導く主蒸気管の途中から分岐して復
水器と連通したタービンバイパス管の途中に設け
られたタービンバイパス弁と、前記排ガスボイラ
の節炭器の出口と復水器とを連結する節炭器再循
環管の途中に設けられた節炭器再循環弁とを、蒸
気タービン運転停止後、開いて前記主蒸気管の圧
力を低下させると共に給水を節炭器に循環させる
ことを特徴とする、排ガスボイラ発電装置。1. A turbine bypass valve installed in the middle of a turbine bypass pipe branched from the middle of the main steam pipe that leads steam superheated in the superheater of the exhaust gas boiler to the steam turbine and communicating with the condenser, and a node of the exhaust gas boiler. After the steam turbine operation is stopped, a economizer recirculation valve provided in the middle of the economizer recirculation pipe connecting the outlet of the coalizer and the condenser is opened to reduce the pressure in the main steam pipe. An exhaust gas boiler power generation device characterized by circulating supply water to an energy saver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3766185A JPS61197901A (en) | 1985-02-28 | 1985-02-28 | Generating set for exhaust gas boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3766185A JPS61197901A (en) | 1985-02-28 | 1985-02-28 | Generating set for exhaust gas boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61197901A JPS61197901A (en) | 1986-09-02 |
| JPH0515921B2 true JPH0515921B2 (en) | 1993-03-03 |
Family
ID=12503819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3766185A Granted JPS61197901A (en) | 1985-02-28 | 1985-02-28 | Generating set for exhaust gas boiler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61197901A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4905941B2 (en) * | 2006-09-22 | 2012-03-28 | バブコック日立株式会社 | Waste heat recovery boiler and its steam pressure control method |
| JP6103347B2 (en) * | 2012-12-05 | 2017-03-29 | 中国電力株式会社 | Boiler forced cooling method after fire extinguishing of boiler in power generation equipment |
| JP2020125700A (en) * | 2019-02-01 | 2020-08-20 | 株式会社東芝 | Power generation facility, power generation facility control device, and power generation facility control method |
-
1985
- 1985-02-28 JP JP3766185A patent/JPS61197901A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61197901A (en) | 1986-09-02 |
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