JPH06272514A - Back pressure controlling method for steam turbine in refuse incinerating power generation - Google Patents
Back pressure controlling method for steam turbine in refuse incinerating power generationInfo
- Publication number
- JPH06272514A JPH06272514A JP6200393A JP6200393A JPH06272514A JP H06272514 A JPH06272514 A JP H06272514A JP 6200393 A JP6200393 A JP 6200393A JP 6200393 A JP6200393 A JP 6200393A JP H06272514 A JPH06272514 A JP H06272514A
- Authority
- JP
- Japan
- Prior art keywords
- steam
- steam turbine
- waste heat
- heat boiler
- condenser
- 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.)
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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)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はゴミ発電方法における蒸
気タービンの背圧制御法、より詳しくは、ゴミ焼却炉の
焼却ガスを導入する廃熱ボイラのボイラチューブの腐食
を防止し、かつ発電効率を大幅に向上させたゴミ発電方
法における蒸気タービンの背圧制御方法に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a back pressure of a steam turbine in a waste power generation method, and more particularly, to prevent corrosion of a boiler tube of a waste heat boiler for introducing incineration gas from a waste incinerator and to improve power generation efficiency The present invention relates to a method for controlling back pressure of a steam turbine in a waste power generation method in which the power consumption is significantly improved.
【０００２】[0002]
【従来の技術】一般にエネルギーの有効利用を図るため
のゴミ焼却炉の焼却ガスを廃熱ボイラに導入し、こゝで
生成した蒸気を蒸気タービンに供給して発電することが
知られている。しかしながら、このような発電方法にお
いては、廃熱ボイラのボイラチューブが腐食するという
問題がある。即ち、一般にこのゴミ焼却炉の焼却ガスの
中には塩素が多量に含まれているため、ボイラーチュー
ブの表面温度が３００℃程度に達すると、このボイラチ
ューブが高温腐食し、一方、表面温度が１５０℃未満に
なると硫酸等による酸によって低温腐食が生じるという
問題がある。2. Description of the Related Art In general, it is known that incinerator gas from a refuse incinerator for effective use of energy is introduced into a waste heat boiler and steam generated in this manner is supplied to a steam turbine to generate electricity. However, such a power generation method has a problem that the boiler tube of the waste heat boiler is corroded. That is, in general, the incinerator gas of this refuse incinerator contains a large amount of chlorine, so when the surface temperature of the boiler tube reaches about 300 ° C., the boiler tube is corroded at high temperature, while the surface temperature is If the temperature is lower than 150 ° C, there is a problem that low temperature corrosion is caused by an acid such as sulfuric acid.
【０００３】しかしながら、このような発電方法におい
て、蒸気タービンでの発電効率を高めるためには、この
廃熱ボイラで生成された蒸気を高温でもって蒸気タービ
ンに供給するのが好ましい。このような技術的な問題か
ら、本出願人はゴミ焼却炉の焼却ガスを導入する第１の
廃熱ボイラで生成された蒸気を駆動源とする蒸気タービ
ンにより駆動される発電機と、ガスタービンによって駆
動される発電機と、前記ガスタービンの排ガスを導入す
る第２の廃熱ボイラとよりなり、前記第１の廃熱ボイラ
で生成された蒸気を前記第２の廃熱ボイラで過熱した
後、前記蒸気タービンに供給するようにしたゴミ発電方
法を先に提案した（特願平３−１４７４６５号）。However, in such a power generation method, in order to increase the power generation efficiency in the steam turbine, it is preferable to supply the steam generated in the waste heat boiler to the steam turbine at a high temperature. Due to such a technical problem, the present applicant has proposed a generator driven by a steam turbine driven by steam generated in a first waste heat boiler for introducing incineration gas of a refuse incinerator, and a gas turbine. And a second waste heat boiler for introducing the exhaust gas of the gas turbine, after steam generated in the first waste heat boiler is superheated in the second waste heat boiler. , And proposed a waste power generation method for supplying the steam turbine (Japanese Patent Application No. 3-147465).
【０００４】そしてこのゴミ発電方法においては、蒸気
タービンに供給する蒸気は３４０℃〜４００℃程度の高
温蒸気であり、従って、この蒸気タービンから排出され
た低温蒸気を復水器で復水する場合、この復水器内は
0.0 8 ata程度の低圧とすることができ、その結果、発
電効率を高めることができる。In this waste power generation method, the steam supplied to the steam turbine is high temperature steam of about 340 ° C. to 400 ° C. Therefore, when the low temperature steam discharged from the steam turbine is condensed by the condenser. , Inside this condenser
A low voltage of about 0.08 ata can be achieved, and as a result, power generation efficiency can be improved.
【０００５】[0005]
【発明が解決しようとする課題】ところで、前記のゴミ
発電方法においては、ガスタービンを駆動するための燃
料が必要であり、そのため発電コストが高くなるという
問題がある。一般に商用電力の単価は昼間が高く夜間は
安くなる。従って前記ゴミ発電方法においては昼間にガ
スタービンと蒸気タービンの双方を運転し、夜間にはガ
スタービンの運転を停止して蒸気タービンのみの運転に
切換えることが考えられる。ところが前記したように蒸
気タービンの背圧、具体的には復水器内が 0.0 8 ataの
如き低圧であると蒸気タービンにエロージョンが発生
し、そのため耐久性に問題が生ずることになる。By the way, in the above-mentioned dust power generation method, there is a problem that fuel for driving the gas turbine is required, which increases power generation cost. Generally, the unit price of commercial power is high in the daytime and low at night. Therefore, in the waste power generation method, it is conceivable to operate both the gas turbine and the steam turbine in the daytime and stop the operation of the gas turbine at night to switch the operation to only the steam turbine. However, as described above, when the back pressure of the steam turbine, specifically, a low pressure such as 0.08 ata in the condenser, erosion occurs in the steam turbine, which causes a problem in durability.
【０００６】そこで、この蒸気タービンの背圧、具体的
には復水器内の圧力を調節しながら運転することによっ
てこの蒸気タービンのエロージョンを防止する方法を提
供することを目的とするものである。Therefore, it is an object of the present invention to provide a method for preventing the erosion of the steam turbine by operating while controlling the back pressure of the steam turbine, specifically, the pressure in the condenser. .
【０００７】[0007]
【課題を解決するための手段】本発明は前記ゴミ発電方
法における問題点を解決するためになされたものであっ
て、ゴミ焼却炉１０の焼却ガスＧ’を導入する第１の廃
熱ボイラ１１で生成された蒸気Ｓ1 を駆動源とする蒸気
タービン３により駆動される発電機４と、ガスタービン
２によって駆動される発電機１と、前記ガスタービン２
の排ガスＧを導入する第２の廃熱ボイラ５とよりなり、
前記第１の廃熱ボイラ１１で生成された蒸気Ｓ1 を前記
第２の廃熱ボイラ５で過熱した後、前記蒸気タービン３
に供給するとともに、該蒸気タービン３から排出される
蒸気Ｓ3 を復水器１４で復水となし、該復水を前記第１
の廃熱ボイラ１１へ供給するようにしたゴミ発電方法に
おいて、前記復水器１４に供給される冷却水Ｗの温度を
制御して前記蒸気タービン３の背圧を制御するゴミ発電
における蒸気タービンの背圧制御方法を提供するもので
ある。The present invention has been made to solve the problems in the above-described waste power generation method, and is a first waste heat boiler 11 for introducing the incineration gas G'of the waste incinerator 10. The generator 4 driven by the steam turbine 3 having the steam S 1 generated in 1. as the drive source, the generator 1 driven by the gas turbine 2, and the gas turbine 2
And a second waste heat boiler 5 for introducing the exhaust gas G of
After the steam S 1 generated in the first waste heat boiler 11 is superheated in the second waste heat boiler 5, the steam turbine 3
And the steam S 3 discharged from the steam turbine 3 is condensed by the condenser 14 into the condensate.
In the waste power generation method for supplying the waste heat boiler 11 to the waste heat boiler 11, the temperature of the cooling water W supplied to the condenser 14 is controlled to control the back pressure of the steam turbine 3. A back pressure control method is provided.
【０００８】[0008]
【作 用】本発明のゴミ発電方法における蒸気タービン
の背圧制御方法において、ガスタービンの運転時におい
ては復水器へ供給される冷却水の温度を下げ、内圧を例
えば 0.0 8 ata程度まで復水器へ供給される冷却水の温
度を高めることによってその内圧が 0.2 ata程度となる
ように昇圧させるものである。[Operation] In the method for controlling the back pressure of the steam turbine in the waste power generation method of the present invention, the temperature of the cooling water supplied to the condenser is lowered during the operation of the gas turbine to recover the internal pressure to, for example, about 0.08 ata. By raising the temperature of the cooling water supplied to the water vessel, the internal pressure is increased to about 0.2 ata.
【０００９】そしてこれらの冷却水の温度制御は、好ま
しくは廃水管１９に設けられた制御弁１６と冷却水供給
管１８と排出管１９との間に制御弁２０を有するバイパ
ス管２１を設け、蒸気タービン３の入口の温度を検出
し、この信号を制御装置２２に導き、この制御装置２２
からの信号により前記した制御弁２０，１６を制御する
ことによって行うことができる。To control the temperature of these cooling waters, preferably, a control valve 16 provided in the waste water pipe 19 and a bypass pipe 21 having a control valve 20 between the cooling water supply pipe 18 and the discharge pipe 19 are provided. The temperature at the inlet of the steam turbine 3 is detected, this signal is guided to the controller 22, and this controller 22
This can be done by controlling the control valves 20 and 16 described above by a signal from
【００１０】[0010]
【実 施 例】以下、図１及び図２に基づき本発明によ
るゴミ発電方法における蒸気タービン背圧制御方法の一
実施例を説明する。図においてＡは発電ゾーン、Ｂはゴ
ミ焼却炉ゾーンであり、発電ゾーンＡには燃料Ｆにより
作動されて第１の発電機１を駆動するガスタービン２
と、蒸気タービン３により駆動される第２の発電機４と
第２の廃熱ボイラ５とが配置されている。[Embodiment] An embodiment of a steam turbine back pressure control method in a waste power generation method according to the present invention will be described below with reference to FIGS. 1 and 2. In the figure, A is a power generation zone, B is a refuse incinerator zone, and in the power generation zone A, a gas turbine 2 that is operated by a fuel F and drives the first generator 1
And a second generator 4 driven by the steam turbine 3 and a second waste heat boiler 5 are arranged.
【００１１】この第２の廃熱ボイラ５には過熱器６、蒸
発器７及び予熱器８が設けられ、この第２の廃熱ボイラ
５にガスタービン２の例えば５００℃程度の高温排ガス
Ｇが排ガスライン９から供給されるようになっている。
ゴミ焼却ゾーンＢには焼却炉１０と第１の廃熱ボイラ１
１と排ガス処理装置１２とが設けられ、焼却炉１０で発
生した焼却ガスＧ’は例えば６００℃程度で第１の廃熱
ボイラ１１に導入され、流量制御弁２４を介してボイラ
ーチューブ１３内を流れる給水を加熱し、例えば２５０
℃程度の蒸気Ｓ1 を生成する。この蒸気Ｓ1 は蒸気ライ
ンＬ1 から第２の廃熱ボイラ５内の過熱器６で過熱され
て３４０℃〜４００℃の過熱蒸気Ｓ2 となって蒸気ライ
ンＬ2 を通じて蒸気タービン３に供給され、これを駆動
して第２の発電機４で発電するようになっている。The second waste heat boiler 5 is provided with a superheater 6, an evaporator 7 and a preheater 8, and the second waste heat boiler 5 is supplied with high temperature exhaust gas G of about 500 ° C. of the gas turbine 2, for example. It is supplied from the exhaust gas line 9.
In the refuse incineration zone B, an incinerator 10 and a first waste heat boiler 1
1 and the exhaust gas treatment device 12, the incineration gas G ′ generated in the incinerator 10 is introduced into the first waste heat boiler 11 at, for example, about 600 ° C., and flows through the boiler tube 13 via the flow control valve 24. Heat the flowing water supply, eg 250
A vapor S 1 of about ° C is generated. This steam S 1 is superheated from the steam line L 1 in the superheater 6 in the second waste heat boiler 5 to become superheated steam S 2 of 340 ° C. to 400 ° C. and supplied to the steam turbine 3 through the steam line L 2. The second generator 4 is driven to generate electric power.
【００１２】蒸気タービン３より排出された低温低圧の
蒸気Ｓ3 は蒸気ラインＬ4 から復水器１４に導入され、
こゝで冷却塔１５から冷却水供給管１８を経て供給され
る冷却水Ｗにより冷却されて凝縮する。図２にも示され
るように、復水器１４に接続された冷却水供給管１８に
は温度センサー１７を、また、冷却水排出管１９には制
御弁１６を有し、更にこの冷却水供給管１８と冷却水排
出管１９との間に制御弁２０を有するバイパス管２１が
設けられ、この制御弁１６と制御弁２０とは制御装置２
２からの信号Ｖ1 で制御されるようになっている。The low-temperature low-pressure steam S 3 discharged from the steam turbine 3 is introduced into the condenser 14 through the steam line L 4 .
Here, the cooling water W supplied from the cooling tower 15 through the cooling water supply pipe 18 cools and condenses. As shown in FIG. 2, the cooling water supply pipe 18 connected to the condenser 14 has a temperature sensor 17, and the cooling water discharge pipe 19 has a control valve 16. A bypass pipe 21 having a control valve 20 is provided between the pipe 18 and the cooling water discharge pipe 19, and the control valve 16 and the control valve 20 serve as the control device 2
It is designed to be controlled by the signal V 1 from 2.
【００１３】具体的には、蒸気タービン３に供給される
蒸気Ｓ2 の温度を検知する温度センサー２３からの信号
Ｖ2 と、温度センサー１７からの冷却水Ｗの温度の信号
Ｖ3とが制御装置２２に入力され、両信号Ｖ2 とＶ3 に
より信号Ｖ1 が作成され、前記制御弁１６と制御弁２０
とが夫々制御され、復水器１４内の圧力が調整されるこ
とになる。Specifically, the signal V 2 from the temperature sensor 23 for detecting the temperature of the steam S 2 supplied to the steam turbine 3 and the signal V 3 of the temperature of the cooling water W from the temperature sensor 17 are controlled. The signal V 1 is input to the device 22, and the signal V 1 is generated by both signals V 2 and V 3 , and the control valve 16 and the control valve 20 are connected.
Are controlled respectively, and the pressure in the condenser 14 is adjusted.
【００１４】例えば、前述したように過熱蒸気Ｓ2 の温
度が３４０℃〜４００℃の範囲にあるときは制御弁１６
と制御弁２０を操作して冷却水Ｗの温度を低下させて復
水器１４の温度を低下させて復水器１４の内圧は0.0 8
ata 程度に保って運転する。そしてガスタービン２の運
転を停止したときは、第１の廃熱ボイラ１１で生成した
２５０℃程度の蒸気Ｓ1 は蒸気タービン３に導入される
こととなり、その温度の蒸気ではエロージョンの発生す
る原因となるので、制御弁１６，２０が制御装置２２で
制御されて復水器１４へ供給される冷却水Ｗの温度を上
昇させ、復水器１４内の圧力は 0.2 ata程度となるよう
に運転される。For example, as described above, when the temperature of the superheated steam S 2 is in the range of 340 ° C to 400 ° C, the control valve 16
And the control valve 20 are operated to lower the temperature of the cooling water W to lower the temperature of the condenser 14 so that the internal pressure of the condenser 14 is 0.08.
Drive at the same level as ata. Then, when the operation of the gas turbine 2 is stopped, the steam S 1 of about 250 ° C. generated in the first waste heat boiler 11 is introduced into the steam turbine 3, and the cause of erosion in the steam at that temperature. Therefore, the control valves 16 and 20 are controlled by the control device 22 to raise the temperature of the cooling water W supplied to the condenser 14, and the pressure inside the condenser 14 is controlled to about 0.2 ata. To be done.
【００１５】そして復水器１４内で凝縮した凝縮水Ｗ’
は、給水管２５から予熱器８を経てその一部が第１の廃
熱ボイラ１１に、また、残りが蒸発器７に供給され、こ
の蒸発器７で生成された蒸気Ｓ4 はドラム２６を経て蒸
気ラインＬ1 内に供給されて過熱器６を経由して蒸気Ｓ
2 となり、蒸気タービン３に供給される。The condensed water W'condensed in the condenser 14
Is supplied from the water supply pipe 25 to the first waste heat boiler 11 through the preheater 8 and the rest to the evaporator 7, and the steam S 4 generated in the evaporator 7 is supplied to the drum 26. Is supplied to the steam line L 1 and then passes through the superheater 6 to generate the steam S.
2 and is supplied to the steam turbine 3.
【００１６】[0016]
【発明の効果】以上の説明から明らかなように本発明に
よるゴミ発電方法における蒸気タービンの背圧制御方法
によれば、復水器１４への冷却水Ｗの温度を制御するこ
とによって蒸気タービン３の背圧を、エロージョンの発
生しない範囲で制御することができ、結果として発電効
率の向上と蒸気タービン３の耐久性を向上させることが
できるという効果がある。As is apparent from the above description, according to the method for controlling the back pressure of the steam turbine in the waste power generation method according to the present invention, the temperature of the cooling water W to the condenser 14 is controlled to control the steam turbine 3 The back pressure can be controlled within a range where erosion does not occur, and as a result, the power generation efficiency and the durability of the steam turbine 3 can be improved.
【図１】本発明によるゴミ発電方法における蒸気タービ
ンの背圧制御方法の一実施例を示すものであって、図１
はその方法のフロー図である。1 shows an embodiment of a back pressure control method for a steam turbine in a waste power generation method according to the present invention.
Is a flow chart of the method.
【図２】図１のＣ部の拡大図である。 １ 第１の発電機 ２ ガスタービン ３ 蒸気
タービン ５ 第２の廃熱ボイラ ６ 過熱器 ７ 蒸発器
８ 予熱器 ９ 排ガスライン １０ 焼却炉 １１ 第１の廃
熱ボイラ １２ 排ガス処理装置 １３ ボイラチューブ １
４ 復水器 １５ 冷却塔 １６，２０ 制御弁 １７ 温度セ
ンサー １８ 冷却水供給管 １９ 冷却水排出管 ２１
バイパス管 ２２ 制御装置 ２４ 流量制御弁 ２５ 給水管
２７ ドラムFIG. 2 is an enlarged view of a C portion of FIG. 1 1st generator 2 Gas turbine 3 Steam turbine 5 2nd waste heat boiler 6 Superheater 7 Evaporator
8 Preheater 9 Exhaust Gas Line 10 Incinerator 11 First Waste Heat Boiler 12 Exhaust Gas Treatment Device 13 Boiler Tube 1
4 Condenser 15 Cooling Tower 16, 20 Control Valve 17 Temperature Sensor 18 Cooling Water Supply Pipe 19 Cooling Water Discharge Pipe 21
Bypass pipe 22 Control device 24 Flow control valve 25 Water supply pipe 27 Drum
Claims (1)
廃熱ボイラで生成された蒸気を駆動源とする蒸気タービ
ンにより駆動される発電機と、ガスタービンによって駆
動される発電機と、前記ガスタービンの排ガスを導入す
る第２の廃熱ボイラとよりなり、前記第１の廃熱ボイラ
で生成された蒸気を前記第２の廃熱ボイラで過熱した
後、前記蒸気タービンに供給するとともに、該蒸気ター
ビンから排出される蒸気を復水器で復水となし、該復水
を前記第１の廃熱ボイラへ供給するようにしたゴミ発電
方法において、前記復水器に供給される冷却水の温度を
制御して前記蒸気タービンの背圧を制御するゴミ発電に
おける蒸気タービンの背圧制御方法。1. A generator driven by a steam turbine using a steam generated in a first waste heat boiler for introducing incineration gas of a refuse incinerator as a drive source, and a generator driven by a gas turbine, A second waste heat boiler for introducing the exhaust gas of the gas turbine, wherein the steam generated in the first waste heat boiler is superheated in the second waste heat boiler and then supplied to the steam turbine. In the waste power generation method in which steam discharged from the steam turbine is condensed by a condenser and the condensed water is supplied to the first waste heat boiler, cooling is supplied to the condenser. A method for controlling the back pressure of a steam turbine in refuse power generation, which controls the temperature of water to control the back pressure of the steam turbine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6200393A JPH06272514A (en) | 1993-03-22 | 1993-03-22 | Back pressure controlling method for steam turbine in refuse incinerating power generation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6200393A JPH06272514A (en) | 1993-03-22 | 1993-03-22 | Back pressure controlling method for steam turbine in refuse incinerating power generation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06272514A true JPH06272514A (en) | 1994-09-27 |
Family
ID=13187549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6200393A Pending JPH06272514A (en) | 1993-03-22 | 1993-03-22 | Back pressure controlling method for steam turbine in refuse incinerating power generation |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06272514A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52155882A (en) * | 1976-06-18 | 1977-12-24 | Hitachi Ltd | Process and apparatus for stabilizing output of combination plant of gas turbine, |
| JPS57119114A (en) * | 1981-01-16 | 1982-07-24 | Toshiba Corp | Condenser vacuum controller |
-
1993
- 1993-03-22 JP JP6200393A patent/JPH06272514A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52155882A (en) * | 1976-06-18 | 1977-12-24 | Hitachi Ltd | Process and apparatus for stabilizing output of combination plant of gas turbine, |
| JPS57119114A (en) * | 1981-01-16 | 1982-07-24 | Toshiba Corp | Condenser vacuum controller |
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| A02 | Decision of refusal |
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