JPH04321702A - Demand and supply system of steam in cogenerating power plant - Google Patents
Demand and supply system of steam in cogenerating power plantInfo
- Publication number
- JPH04321702A JPH04321702A JP8807391A JP8807391A JPH04321702A JP H04321702 A JPH04321702 A JP H04321702A JP 8807391 A JP8807391 A JP 8807391A JP 8807391 A JP8807391 A JP 8807391A JP H04321702 A JPH04321702 A JP H04321702A
- Authority
- JP
- Japan
- Prior art keywords
- steam
- turbine
- deaerator
- demand
- back pressure
- 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.)
- Pending
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000010248 power generation Methods 0.000 claims description 5
- 238000000605 extraction Methods 0.000 abstract 1
- 230000005611 electricity Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 210000003437 trachea Anatomy 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、熱併給発電所における
経済的な蒸気需給システムに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an economical steam supply and demand system in a combined heat and power plant.
【０００２】0002
【従来の技術】製鉄所等の大規模プラントに電力ととも
に蒸気を供給する熱併給発電所においては、高圧蒸気に
より背圧タービンを運転し、発電機によって電力を取り
出すと同時に必要量の低圧蒸気を供給するのが通常であ
る。従ってそのときの低圧蒸気（以下、工場用蒸気とも
いう）の需要量によって背圧タービンの起動、停止が行
われ、運転状態における蒸気発生量の微調整は一旦発生
させた蒸気を大気に放散することにより行っており、エ
ネルギーの浪費として問題があった。[Prior Art] In cogeneration power plants that supply electricity and steam to large-scale plants such as steel mills, high-pressure steam is used to drive a back-pressure turbine, and a generator generates electricity while at the same time generating the required amount of low-pressure steam. It is normal to supply Therefore, the backpressure turbine is started and stopped depending on the demand for low-pressure steam (hereinafter also referred to as factory steam) at that time, and the fine adjustment of the amount of steam generation during operation is performed by dissipating the steam once generated into the atmosphere. This was a problem because it was a waste of energy.
【０００３】一方、こうした大規模プラントの電力とし
ては、電力会社からの買電と自家発電とが併用されるが
、買電量は契約により上限値が決まっているためこれを
越えることはできず、ピーク需要に備えて自家発電の設
備能力を増大させる傾向にある。その場合これら自家発
電設備を優先的に稼働させ、需要変動による不足分を買
電によって補うのが普通である。ところが、自家発電設
備のうち背圧タービンによるものについては、蒸気需要
依存形の運転形態であり、発電設備として常時フル稼働
させるようなことはできず、かりに蒸気需要の少ないと
きに運転すれば蒸気の大気放散が一層増大するという問
題があった。[0003] On the other hand, these large-scale plants use a combination of electricity purchased from electric power companies and in-house power generation, but the amount of electricity purchased cannot exceed the upper limit determined by the contract. There is a trend to increase the installed capacity of private power generation in preparation for peak demand. In such cases, it is normal to operate these in-house power generating facilities preferentially and to make up for the shortfall due to demand fluctuations by purchasing electricity. However, private power generation equipment that uses a back pressure turbine operates in a steam demand-dependent manner, and cannot be operated at full capacity all the time as a power generation equipment; however, if it is operated when steam demand is low, the steam There was a problem that the atmospheric dissipation of
【０００４】このため、蒸気需要の低いときの低圧蒸気
を復水タービンの抽気管に逆送して混気するようにした
システムが特開昭５９−１４５３０７ 号公報に提案さ
れている。
このシステムの蒸気系統のみを図２に示す。通常は高圧
蒸気配管１からの高圧蒸気を復水タービン４に供給して
送風機、発電機等の回転機５に仕事をさせ、エンタルピ
を失った蒸気は復水器８で復水される。一方タービン中
段より抽気管６により抽気して工場用低圧蒸気配管１１
に接続し、低圧蒸気として使用するが、低圧蒸気配管１
１には各種の廃熱ボイラ１２により発生した低圧蒸気も
送り込まれていて、しばしば蒸気が供給過剰となる。抽
気管６には従来逆止弁が設けられていて一方通行であっ
たため、過剰の蒸気は放散弁１４より大気に放散してい
たが、この発明ではこの管路を逆送可能とし、余剰蒸気
を復水タービンに逆送して混気し、回転機５の駆動エネ
ルギとして利用するようにした。[0004] For this reason, a system has been proposed in JP-A-59-145307 in which low-pressure steam when the demand for steam is low is sent back to the bleed pipe of the condensing turbine to generate mixed air. Figure 2 shows only the steam system of this system. Normally, high-pressure steam from a high-pressure steam pipe 1 is supplied to a condensing turbine 4 to perform work on a rotating machine 5 such as a blower or a generator, and the steam that has lost enthalpy is condensed in a condenser 8. On the other hand, air is extracted from the middle stage of the turbine through an air bleed pipe 6, and low pressure steam piping 11 for the factory is used.
It is connected to the low pressure steam pipe 1 and used as low pressure steam.
1 is also fed with low pressure steam generated by various waste heat boilers 12, and there is often an oversupply of steam. Conventionally, the bleed pipe 6 was equipped with a check valve and had a one-way flow, so that excess steam was dissipated into the atmosphere through the release valve 14. However, in this invention, this pipe can be reversed, and the excess steam can be The mixed gas is sent back to the condensate turbine and used as driving energy for the rotating machine 5.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、このような
思想を背圧タービンにも適用し、背圧タービンにおいて
も余剰蒸気を有効に消費できるシステムとすることによ
り、電力需要を優先させた運転を可能とすることを目的
とする。[Problems to be Solved by the Invention] The present invention applies this idea to back pressure turbines, and creates a system that can effectively consume surplus steam even in back pressure turbines, thereby prioritizing electricity demand. The purpose is to enable driving.
【０００６】[0006]
【課題を解決するための手段】本発明は、背圧タービン
ならびに復水タービンを備えて大規模プラントに電力と
ともに蒸気を供給する熱併給発電所において、背圧ター
ビン出側の低圧蒸気配管を調節弁と逆止弁とを介してボ
イラ給水配管の脱気器ならびに復水タービン中段の抽気
管に接続することを特徴とする。[Means for Solving the Problems] The present invention provides for adjusting low-pressure steam piping on the outlet side of the back-pressure turbine in a cogeneration power plant that is equipped with a back-pressure turbine and a condensing turbine and supplies steam along with electric power to a large-scale plant. It is characterized by being connected to the deaerator of the boiler water supply piping and the bleed pipe of the middle stage of the condensing turbine via a valve and a check valve.
【０００７】[0007]
【作 用】本発明によれば、背圧タービンからの戻り
の低圧蒸気配管が調節弁と逆止弁とを介してボイラ給水
配管の脱気器ならびに復水タービン中段の抽気管に接続
されているから、低圧蒸気を常に活用でき、従って背圧
タービンを電力需要を優先させて運転することができる
。[Operation] According to the present invention, the low pressure steam pipe returning from the back pressure turbine is connected to the deaerator of the boiler feed water pipe and the bleed pipe of the middle stage of the condensing turbine via the control valve and the check valve. Because of this, low-pressure steam can always be used, and the back-pressure turbine can be operated with priority given to electricity demand.
【０００８】[0008]
【実施例】本発明の実施例を図１に示す。ボイラ１０で
発生する高圧蒸気（例えば８８ｋｇ／ｃｍ２）は高圧蒸
気配管１により背圧タービン２ならびに復水タービン４
に送られる。背圧タービン２には発電機３が、復水ター
ビン４には回転機５が連結されている。回転機としては
、送風機の他にコンプレッサ、発電機等がある。復水タ
ービン４で仕事をした蒸気は復水器８で冷却され、復水
ポンプ８１、給水加熱器８２を通り、脱気器７で溶存気
体を脱気し、給水ポンプ８３によりボイラ給水配管９を
経て再びボイラ１０に供給される。この間で、給水加熱
器８２および脱気器７で使用する低圧蒸気（例えば６ｋ
ｇ／ｃｍ２）は、復水タービン４の中間段から抽気し、
抽気管６を経てこれらの機器に供給している。ここで本
発明では背圧タービンからの戻りの低圧蒸気配管を、こ
の抽気管と脱気器を結ぶ配管に接続点６０で接続した。
この背圧タービンからの戻りの低圧蒸気は通常１４ｋｇ
／ｃｍ２程度で、プラント内の一般用低圧蒸気配管１１
に接続され、脱気器７で使用している低圧蒸気とは圧力
差があるので、図のように接続点６０の両側に調節弁６
１、６２を挿入し、かつ抽気管６側の調節弁６２にはバ
イパスを設けて本管、バイパスのそれぞれに逆止弁６３
、６４を設けた。[Embodiment] An embodiment of the present invention is shown in FIG. High pressure steam (e.g. 88 kg/cm2) generated in the boiler 10 is passed through the high pressure steam pipe 1 to the back pressure turbine 2 and the condensing turbine 4.
sent to. A generator 3 is connected to the back pressure turbine 2, and a rotating machine 5 is connected to the condensing turbine 4. In addition to blowers, rotating machines include compressors, generators, and the like. The steam that has worked in the condensing turbine 4 is cooled in the condenser 8, passes through the condensing pump 81 and the feed water heater 82, and is degassed from the dissolved gas in the deaerator 7. The water is then supplied to the boiler 10 again. During this period, low pressure steam (for example, 6k
g/cm2) is extracted from the intermediate stage of the condensing turbine 4,
These devices are supplied through an air bleed pipe 6. Here, in the present invention, the low pressure steam pipe returning from the back pressure turbine is connected to the pipe connecting the bleed pipe and the deaerator at the connection point 60. The low pressure steam returned from this back pressure turbine is usually 14 kg.
/cm2, general low pressure steam piping 11 in the plant
Since there is a pressure difference from the low pressure steam used in the deaerator 7, there are control valves 6 on both sides of the connection point 60 as shown in the figure.
1 and 62, and a bypass is provided in the control valve 62 on the bleed pipe 6 side, and a check valve 63 is installed in each of the main pipe and the bypass.
, 64 were established.
【０００９】背圧タービン２を運転しないときは、調節
弁６１、６２とも閉じておくと、脱気器７へは復水ター
ビン４から抽気した低圧蒸気が供給される。背圧タービ
ン２を低負荷で運転するときは、調節弁６１を開いて戻
りの低圧蒸気を脱気器７に流すと、脱気器７ゆきの蒸気
が徐々に復水タービン４側から背圧タービン２側に切り
替わってゆく。背圧タービン２をさらに高負荷で運転す
るときは、調節弁６２をも開くと、背圧タービン２から
の蒸気は脱気器７で使用されるに止まらず圧力差により
抽気管６を逆流して復水タービン４中段に給気され、回
転機の駆動エネルギーとして利用される。When the back pressure turbine 2 is not operated, both the control valves 61 and 62 are closed, and the low pressure steam extracted from the condensing turbine 4 is supplied to the deaerator 7. When operating the back pressure turbine 2 at low load, the control valve 61 is opened to allow the returned low pressure steam to flow into the deaerator 7, and the steam flowing into the deaerator 7 gradually flows from the condensing turbine 4 side to the back pressure turbine. Switching to the second side. When operating the back pressure turbine 2 at a higher load, the control valve 62 is also opened, and the steam from the back pressure turbine 2 is not only used in the deaerator 7, but also flows back through the bleed pipe 6 due to the pressure difference. The air is supplied to the middle stage of the condensing turbine 4 and used as driving energy for the rotating machine.
【００１０】0010
【発明の効果】本発明によれば、背圧タービン出側の低
圧蒸気配管が、プラント内の一般用低圧蒸気配管以外に
も大容量のボイラ給水配管の脱気器ならびに復水タービ
ン中段の抽気管に接続されているから、低圧蒸気を大気
に放散させることなく常に活用でき、背圧タービンを電
力需要を優先させて任意に運転することができる。According to the present invention, the low-pressure steam piping on the outlet side of the back-pressure turbine can be used not only for general low-pressure steam piping in the plant but also for the deaerator of the large-capacity boiler feed water piping and the extractor of the middle stage of the condensing turbine. Because it is connected to the trachea, low-pressure steam can be used at all times without being released into the atmosphere, and the back-pressure turbine can be operated at will, prioritizing electricity demand.
【図１】本発明の実施例の構成を示す系統図である。FIG. 1 is a system diagram showing the configuration of an embodiment of the present invention.
【図２】従来の技術による構成を示す系統図である。FIG. 2 is a system diagram showing a configuration according to a conventional technique.
２ 背圧タービン ４ 復水タービン ６ 抽気管 ７ 脱気器 １０ ボイラ １１ 低圧蒸気配管 ６１、６２ 調節弁 ６３、６４ 逆止弁 2 Back pressure turbine 4 Condensing turbine 6 Bleed pipe 7 Deaerator 10 Boiler 11 Low pressure steam piping 61, 62 Control valve 63, 64 Check valve
Claims (1)
備えて大規模プラントに電力とともに蒸気を供給する熱
併給発電所において、背圧タービン出側の低圧蒸気配管
を調節弁と逆止弁とを介してボイラ給水配管の脱気器な
らびに復水タービン中段の抽気管に接続することを特徴
とする熱併給発電所における蒸気需給システム。Claim 1: In a cogeneration power plant that is equipped with a back pressure turbine and a condensing turbine and supplies steam as well as electric power to a large-scale plant, the low pressure steam piping on the outlet side of the back pressure turbine is connected through a control valve and a check valve. A steam supply and demand system in a combined heat and power generation power plant, which is characterized by being connected to the deaerator of the boiler water supply pipe and the bleed pipe of the middle stage of the condensing turbine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8807391A JPH04321702A (en) | 1991-04-19 | 1991-04-19 | Demand and supply system of steam in cogenerating power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8807391A JPH04321702A (en) | 1991-04-19 | 1991-04-19 | Demand and supply system of steam in cogenerating power plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04321702A true JPH04321702A (en) | 1992-11-11 |
Family
ID=13932684
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8807391A Pending JPH04321702A (en) | 1991-04-19 | 1991-04-19 | Demand and supply system of steam in cogenerating power plant |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04321702A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006233931A (en) * | 2005-02-28 | 2006-09-07 | Miura Co Ltd | Boiler drive electric power supply system |
| JP2010270637A (en) * | 2009-05-20 | 2010-12-02 | Toshiba Corp | Steam turbine power generation system |
-
1991
- 1991-04-19 JP JP8807391A patent/JPH04321702A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006233931A (en) * | 2005-02-28 | 2006-09-07 | Miura Co Ltd | Boiler drive electric power supply system |
| JP2010270637A (en) * | 2009-05-20 | 2010-12-02 | Toshiba Corp | Steam turbine power generation system |
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