JPH0297801A - Method for bleeding auxiliary steam from exhaust heat recovery boiler - Google Patents
Method for bleeding auxiliary steam from exhaust heat recovery boilerInfo
- Publication number
- JPH0297801A JPH0297801A JP25037088A JP25037088A JPH0297801A JP H0297801 A JPH0297801 A JP H0297801A JP 25037088 A JP25037088 A JP 25037088A JP 25037088 A JP25037088 A JP 25037088A JP H0297801 A JPH0297801 A JP H0297801A
- Authority
- JP
- Japan
- Prior art keywords
- steam
- pressure
- heat recovery
- exhaust heat
- auxiliary
- 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
- 238000011084 recovery Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims description 3
- 230000000740 bleeding effect Effects 0.000 title abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000000605 extraction Methods 0.000 claims description 15
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 28
- 238000010586 diagram Methods 0.000 description 13
- 238000010248 power generation Methods 0.000 description 12
- 230000007423 decrease Effects 0.000 description 11
- 238000001704 evaporation Methods 0.000 description 7
- 230000008020 evaporation Effects 0.000 description 7
- 238000004891 communication Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000002918 waste heat Substances 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 230000002542 deteriorative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Landscapes
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、複合発電プラントにおける排熱回収ボイラに
係り、特に発生蒸気を補助蒸気系へ供給する排熱回収ボ
イラの抽気方法に関するものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an exhaust heat recovery boiler in a combined cycle power plant, and particularly relates to an extraction method for an exhaust heat recovery boiler that supplies generated steam to an auxiliary steam system. .
（従来の技術）
高効率発電の一環として、最近、複合発電プラントの建
設が進められてし−る。このプラントは、ガスタービン
によって発電するとともに、ガスタービンから排出され
た排ガスの保有熱を排熱回収ボイラで回収し、その排熱
回収ボイラで発生した蒸気により蒸気タービンを駆動し
て発電させるシステムになっている。(Prior Art) As part of high-efficiency power generation, construction of combined power generation plants has recently been progressing. This plant uses a system that generates electricity using a gas turbine, recovers the heat retained in the exhaust gas discharged from the gas turbine using an exhaust heat recovery boiler, and uses the steam generated by the exhaust heat recovery boiler to drive a steam turbine to generate electricity. It has become.
このプラントは前述のような高効率発電に加えガスター
ビンの特長である急速起動の容易性、高い負荷応答性な
どの特長も有しており、近年の電力需要形態に即した中
間負荷運用に好適な発電プラントである。また、この発
電プラントは、ガスタービンと排熱回収ボイラと蒸気タ
ービンの組合わせで出力は約１２万ｋｗであるので、そ
れら複数の装置を組合わせて、高出力の発電プラントを
構成する。In addition to high-efficiency power generation as mentioned above, this plant also has the features of gas turbines, such as ease of rapid startup and high load response, making it suitable for intermediate load operation in line with recent electricity demand patterns. It is a power generation plant. Furthermore, this power generation plant is a combination of a gas turbine, an exhaust heat recovery boiler, and a steam turbine, and has an output of approximately 120,000 kW, so a high-output power generation plant is constructed by combining a plurality of these devices.
第１０ｗＪは、この複合プラントの概略系統図である。The 10th wJ is a schematic diagram of this complex plant.
ガスタービン４からの排ガスＧは、排熱回収ボイラ５の
排ガス通路６に導入される。この排ガス通路６には、過
熱器１２．高圧ドラム８．高圧蒸発＠ｌ Ｏ，及び高圧
節炭器７．が配置される。Exhaust gas G from the gas turbine 4 is introduced into an exhaust gas passage 6 of the exhaust heat recovery boiler 5. This exhaust gas passage 6 has a superheater 12. High pressure drum8. High-pressure evaporation@lO, and high-pressure economizer7. is placed.
一方、被加熱流体である給水Ｗｐは、復水ポンプ１７よ
り給水管１８を経て高圧節炭器７に供給され、所定の温
度までに予熱された後、高圧ドラム８へ供給される。On the other hand, the feed water Wp, which is the fluid to be heated, is supplied from the condensate pump 17 through the water supply pipe 18 to the high-pressure economizer 7, preheated to a predetermined temperature, and then supplied to the high-pressure drum 8.
高圧ドラム８へ供給された給水は、高圧ドラム８の高圧
下降管９を経て高圧蒸発＄１０で一部が蒸気となり残り
は給水で高圧ドラム８に戻る。高圧ドラム８内で分離さ
れた蒸気はドラム蒸気出口管１１を経て、過熱器１２へ
送らか、ここでさらに・昇温された後、高圧主蒸気管１
３より蒸気タービン１４へ供給され、蒸気タービン１４
により発電機１５を駆動して発電を行なう。The feed water supplied to the high-pressure drum 8 passes through the high-pressure downcomer pipe 9 of the high-pressure drum 8, undergoes high-pressure evaporation $10, and part of it becomes steam, and the rest returns to the high-pressure drum 8 as feed water. The steam separated in the high-pressure drum 8 passes through the drum steam outlet pipe 11 and is sent to the superheater 12, where it is further heated and then sent to the high-pressure main steam pipe 11.
3 to the steam turbine 14, and the steam turbine 14
The generator 15 is driven to generate electricity.
また、第１１図に示す如く、プラント起動時または停止
時には蒸気タービン１４のグランドシール用の蒸気を必
要とするため、補助蒸気ヘッダー２１から蒸気が補助蒸
気管２０およびグランドシール蒸気母管２２を経由して
、蒸気タービン１４へ供給される。なお、補助蒸気ヘッ
ダー２１への蒸気供給源としては１通常、補助ボイラ２
３が使用されるが、複合発電プラントの場合、排熱回収
ボイラ５が複数設置されるため、排熱回収ボイラ５の高
圧主蒸気管１３からの蒸気も、高圧主蒸気抽気管１９を
経由して供給される。In addition, as shown in FIG. 11, when starting or stopping the plant, steam is required for the grand seal of the steam turbine 14, so steam from the auxiliary steam header 21 passes through the auxiliary steam pipe 20 and the grand seal steam main pipe 22. Then, it is supplied to the steam turbine 14. Note that the steam supply source to the auxiliary steam header 21 is usually 1, the auxiliary boiler 2
3 is used, but in the case of a combined cycle power plant, multiple exhaust heat recovery boilers 5 are installed, so the steam from the high pressure main steam pipe 13 of the exhaust heat recovery boiler 5 also passes through the high pressure main steam extraction pipe 19. will be supplied.
一方、ガスタービン排ガスＧ中の窒素酸化物（以下ＮＯ
ｘと略す）を除去するため１通常、排熱回収ボイラ５の
中に、脱硝装置３１が、第１０図に示す如く、高圧蒸発
器ｌＯの後流側あるいは、高圧蒸発器１０の間に設置さ
れる。On the other hand, nitrogen oxides (hereinafter referred to as NO) in gas turbine exhaust gas G
(abbreviated as x) 1 Usually, a denitrification device 31 is installed in the exhaust heat recovery boiler 5 on the downstream side of the high-pressure evaporator IO or between the high-pressure evaporator 10, as shown in FIG. be done.
このように、補助蒸気として排熱回収ボイラ５からの発
生蒸気を利用する場合、蒸気を抽気することによって高
圧ドラム８の圧力が低下し、蒸発量が増加することから
、蒸気を多く抽気した場合以下のような問題が生ずる。In this way, when using the steam generated from the heat recovery boiler 5 as auxiliary steam, the pressure of the high pressure drum 8 decreases by extracting the steam, and the amount of evaporation increases. The following problems arise.
すなわち、（１） 高圧ドラム８圧力が低下すると、
蒸発量が増加し−ドラムの内部に設置されている気水分
離器の分離性能が低下し、蒸気中の水滴が増加し蒸気タ
ービンのタービンブレードを損傷する。また。That is, (1) When the high pressure drum 8 pressure decreases,
The amount of evaporation increases - the separation performance of the steam-water separator installed inside the drum decreases, and water droplets in the steam increase, damaging the turbine blades of the steam turbine. Also.
気水分離器の分離性能が低下することに対応して、気水
分離器の数を増加させると、ドラムが必要以上に大きく
なり非常に不経済である。If the number of steam/water separators is increased in response to the decrease in the separation performance of the steam/water separators, the drum will become larger than necessary, which is very uneconomical.
（２）蒸発量が増加するため、高圧蒸発器出口連絡管２
４やドラム蒸気出口管１１の中の蒸気流速が増加し、振
動が発生する。また、蒸発量の増加に対応して上記の管
径を大きくすることは非常に不経済である。(2) Because the amount of evaporation increases, high pressure evaporator outlet connecting pipe 2
4 and the steam flow rate in the drum steam outlet pipe 11 increases and vibrations occur. Furthermore, it is extremely uneconomical to increase the diameter of the tube in response to an increase in the amount of evaporation.
（３）高圧ドラム８圧力が低下した場合、蒸発量が増加
し高圧蒸発器内の流体温度が下がり、それと熱交換する
ガスタービンの排ガスの保有熱が必要以上に奪われ、脱
硝装置３１人口のガス温度が低下し、脱硝反応の反応速
度が低下し排出ＮＯｘが増加する。(3) When the pressure of the high-pressure drum 8 decreases, the amount of evaporation increases and the temperature of the fluid in the high-pressure evaporator decreases. The gas temperature decreases, the reaction rate of the denitrification reaction decreases, and the amount of NOx discharged increases.
本発明の目的は、上記した従来技術の欠点を解消し、補
助蒸気用として排熱回収ボイラからの発生蒸気を運転性
能を低下させずに抽気する方法を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the prior art described above and to provide a method for extracting steam generated from an exhaust heat recovery boiler for use as auxiliary steam without deteriorating operating performance.
上記目的は、排ガスから脱硝と熱回収をして蒸気を発生
しその蒸気を蒸気タービンと補助蒸気系統へ供給する系
統を備えた複数の排熱回収ボイラと、蒸気を発生しその
蒸気を前記補助蒸気系統へ供給する補助ボイラと、を有
し、前記複数の排熱回収ボイラの何れか１つの排熱回収
ボイラのドラム圧力を検知してその信号により前記補助
蒸気系統へ蒸気を供給する排熱回収ボイラと前記補助ボ
イラを選択する排熱回収ボイラの補助蒸気抽気方法を提
供することにより達成される。。The above purpose is to provide a plurality of exhaust heat recovery boilers equipped with a system that denitrates and recovers heat from exhaust gas, generates steam, and supplies the steam to a steam turbine and an auxiliary steam system; and an auxiliary boiler for supplying steam to the auxiliary steam system, detecting drum pressure of any one of the plurality of exhaust heat recovery boilers and supplying steam to the auxiliary steam system based on the signal thereof. This is accomplished by providing an auxiliary steam extraction method for an exhaust heat recovery boiler that selects a recovery boiler and the auxiliary boiler. .
本発明は、複数の排熱回収ボイラの何れか１つの排熱回
収ボイラのドラム圧力、蒸気又は給水の配管内流電ある
いは配管内流速の信号、脱硝装置入口ガス温度の、蒸気
タービン入口圧力の信号を検知してその信号により前記
補助蒸気系統へ蒸気を供給する排熱回収ボイラと補助ボ
イラを選択することにより、上記した従来技術の欠点を
解消し、補助蒸気用として排熱回収ボイラからの発生蒸
気を運転性能を低下させずに抽気することが出来る。The present invention provides a signal for controlling the drum pressure of any one of a plurality of exhaust heat recovery boilers, the current in the piping of steam or feed water or the flow velocity in the piping, the gas temperature at the inlet of the denitrification equipment, and the pressure at the steam turbine inlet. By detecting a signal and selecting the waste heat recovery boiler and the auxiliary boiler to supply steam to the auxiliary steam system based on the signal, the above-mentioned drawbacks of the conventional technology can be solved, and the waste heat recovery boiler can be used for auxiliary steam. Generated steam can be extracted without deteriorating operational performance.
以下１本発明の各実施例を図面を用いて説明する。 Embodiments of the present invention will be described below with reference to the drawings.
第１図は本発明の第１実施例に係る複合発電プラントの
概略系統図である０図中の符号ＬＡから２４までは従来
のものと同一である。第１図の説明の前に、排熱回収ボ
イラ５からの発生蒸気を抽気した場合の、高圧ドラム８
圧力、蒸発器および脱硝装置入口ガス温度の特性を説明
する。FIG. 1 is a schematic system diagram of a combined power generation plant according to a first embodiment of the present invention. Reference numerals LA to 24 in FIG. 0 are the same as those of the conventional plant. Before explaining FIG.
The characteristics of pressure, evaporator, and denitrification equipment inlet gas temperature are explained.
第２図に、ガスタービン４は同一負荷であっても、蒸気
抽気量を増加すると高圧ドラム８圧力は低下し、それに
伴なって蒸発器が増加、脱硝装置３１の入口ガス温度が
低下する関係を示す。FIG. 2 shows a relationship in which, even if the gas turbine 4 has the same load, increasing the amount of steam extraction causes the pressure in the high-pressure drum 8 to decrease, the number of evaporators to increase accordingly, and the inlet gas temperature to the denitrification device 31 to decrease. shows.
第３図は、蒸気抽気量と高圧ドラム８圧力および気水分
離器の処理可能蒸気量の関係を示したもので、高圧ドラ
ム８圧力が低下すると蒸発量の増加により気水分離器の
気水分離性能が低減し、高圧ドラム８圧力の下限が存在
する。すなわち、蒸気は高圧ドラム８圧力が、抽気無し
のときの圧力Ｐ、から圧力ｐｍ（許容圧力）まで低下す
るまで抽気ができることになる。また、抽気可能量以上
の補助蒸気を必要とする場合は、抽気する排熱回収ボイ
ラ５の針数を増すか補助ボイラ２３を運転することで対
応する必要がある。従って１本発明は第１図に示すよう
に高圧ドラム８圧力を圧力検知器２７で検知して、圧力
Ｐ１になるまでは、調節弁２６Ａを開することによって
＆１排熱回収ボイラ５から蒸気を抽気し、それ以上に蒸
気を必要とする場合は、Ｎａ２．Ｎａ３という具合に抽
気する排熱回収ボイラを増すか、あるいは、補助ボイラ
２３を運転するようにしたものである。ここで、排熱回
収ボイラ５から抽気するか、補助ボイラ２３を運転する
かは制御器２５の中にあらかじめ、運転している排熱回
収ボイラ５を補助ボイラ２３より優先する等のプログラ
ムを組んで決めておけばよい、また、ガスタービン４の
負荷によって、許容圧力Ｐ、は異なるので、ガスタービ
ン４の負荷と許容圧力Ｐ１の関係を求めて制御器２５の
中にプログラムで組んでおくこともできる。このガスタ
ービン負荷によってプログラムを組むということは以下
に示す第２から第４実施例についても言えることである
。Figure 3 shows the relationship between the amount of steam extracted, the pressure of the high pressure drum 8, and the amount of steam that can be processed by the steam separator. The separation performance is reduced and there is a lower limit of the high pressure drum 8 pressure. That is, steam can be extracted until the pressure of the high-pressure drum 8 decreases from the pressure P when no extraction occurs to the pressure pm (allowable pressure). In addition, if more auxiliary steam is required than the amount that can be extracted, it is necessary to deal with this by increasing the number of exhaust heat recovery boiler 5 that extracts steam or by operating the auxiliary boiler 23. Therefore, as shown in FIG. 1, the present invention detects the pressure of the high pressure drum 8 with a pressure detector 27, and opens the control valve 26A until the pressure reaches P1 to remove steam from the waste heat recovery boiler 5. If you need more steam than that, use Na2. Either an exhaust heat recovery boiler that extracts Na3 gas is added, or an auxiliary boiler 23 is operated. Here, whether to extract air from the exhaust heat recovery boiler 5 or operate the auxiliary boiler 23 is determined by setting up a program in the controller 25 in advance, such as giving priority to the operating exhaust heat recovery boiler 5 over the auxiliary boiler 23. Also, since the allowable pressure P varies depending on the load on the gas turbine 4, the relationship between the load on the gas turbine 4 and the allowable pressure P1 should be determined and programmed in the controller 25. You can also do it. This programming based on the gas turbine load also applies to the second to fourth embodiments described below.
第４図は、本発明の第２実施例を説明するための図であ
る。FIG. 4 is a diagram for explaining a second embodiment of the present invention.
この実施例において、前記第１実施例と相違する点は、
第１実施例では高圧ドラム８圧力を検知して抽気蒸気量
を制御していたのに対し、第２実施例のものは、高圧蒸
発器出口連絡管２４内の流量（流速）を流量計２８で測
定して、それによって抽気蒸気量を制御するようにした
ところである。This embodiment differs from the first embodiment as follows:
In the first embodiment, the pressure of the high-pressure drum 8 was detected to control the amount of extracted steam, whereas in the second embodiment, the flow rate (flow rate) in the high-pressure evaporator outlet communication pipe 24 was detected using a flow meter 28. The amount of extracted steam is controlled based on this measurement.
第５１ｇ１は、抽気蒸気量と高圧蒸発器出口連絡管２４
内の蒸気流量、流速の関係を示したもので。No. 51g1 is the amount of extracted steam and the high pressure evaporator outlet connecting pipe 24
This shows the relationship between the steam flow rate and flow velocity within.
制限流速Ｖ、どなる蒸気流量Ｗ１まで抽気可能というこ
とである。なお、ここで高圧蒸発器出口連絡管２４内の
流量のかわりに、ドラム蒸気連絡管１１や高圧主蒸気管
１３や給水管１８の中の流量で制御することも可能であ
る。This means that extraction is possible up to the limited flow rate V and the roaring steam flow rate W1. Here, instead of the flow rate in the high-pressure evaporator outlet communication pipe 24, it is also possible to control the flow rate in the drum steam communication pipe 11, the high-pressure main steam pipe 13, or the water supply pipe 18.
第６図は、本発明の第β実施例を説明するための図であ
る。この実施例において、前記第１ないし第２実施例と
相違する点は、第１ないし第２実施例においては、高圧
ドラム８圧力や高圧蒸発器出口連絡管２４内の流量で抽
気蒸気量を制御していたのに対し、第３実施例では、脱
硝装置３１人ロガス温度で抽気蒸気量を制御するように
したところである。FIG. 6 is a diagram for explaining the βth embodiment of the present invention. This embodiment differs from the first and second embodiments in that in the first and second embodiments, the amount of extracted steam is controlled by the pressure of the high-pressure drum 8 and the flow rate in the high-pressure evaporator outlet connecting pipe 24. In contrast, in the third embodiment, the amount of extracted steam is controlled based on the 31-person log gas temperature of the denitrification device.
第７図は抽気蒸気量と脱硝装置１３１人ロガス温度の関
係を示したもので、ＮＯｘ排出規制値を満足するための
許容ガス温度Ｔ ｇ ｚまで抽気可能ということである
。FIG. 7 shows the relationship between the amount of extracted steam and the gas temperature of the denitrification device 131, which means that extraction is possible up to the allowable gas temperature T g z that satisfies the NOx emission regulation value.
第８図は、本発明の第４実施例を説明するための−であ
る。第８ｉ１１は、前記第１、第２および第３実施例と
比べ、排熱Ｈ収ボイラ５の高ｋＩ：＃ＩＩ炭器７のガス
後流側に比較的圧力の低い圧力系の低圧蒸発４＄３３お
よび低圧節炭器３０を設けたものである。復水ポンプ１
７からの給水ＷＦは低圧節度１１３０へ供給され、そこ
で所定の温度まで予熱された後、低圧゛ドラム３７に供
給される。低圧ドラム３７に供給された給水は、前記高
圧ドラム８と同様に、低圧下降管３２を経て低圧蒸発器
３３゜低圧ドラム３７の順で循環する。低圧ドラム８７
内で分離された蒸気は低圧主蒸気管３５を経て。FIG. 8 is a diagram illustrating a fourth embodiment of the present invention. 8i11 is different from the first, second and third embodiments in that the exhaust heat H collection boiler 5 has a high kI: the low pressure evaporator 4 has a relatively low pressure system on the gas downstream side of the #II coalizer 7. It is equipped with $33 and a low pressure economizer 30. Condensate pump 1
The water supply WF from 7 is supplied to the low pressure moderator 1130, where it is preheated to a predetermined temperature and then supplied to the low pressure drum 37. The feed water supplied to the low-pressure drum 37 is circulated through the low-pressure downcomer pipe 32 in the order of the low-pressure evaporator 33 and the low-pressure drum 37, similarly to the high-pressure drum 8. Low pressure drum 87
The steam separated inside passes through the low pressure main steam pipe 35.
蒸気タービン１４へ送られる。高圧系へは低ｔｉｎ炭器
３０出口給水の一部が分岐され高圧給水ポンプ３４を経
て、高圧節炭器７へ供給される。それ以降は前記に示し
たとおりである。It is sent to the steam turbine 14. A part of the water supplied from the outlet of the low tin coal machine 30 is branched off to the high pressure system and is supplied to the high pressure coal saver 7 via the high pressure water supply pump 34. The rest is as shown above.
前記第１．第２および第３の実施例は高圧系だけを有し
た排熱回収ボイラ５について記していたが、もちろん、
高圧系と低圧系を有する排熱回収ボイラ５についても言
えることである。Said 1st. The second and third embodiments described the exhaust heat recovery boiler 5 having only a high pressure system, but of course,
The same can be said of the exhaust heat recovery boiler 5 having a high pressure system and a low pressure system.
第４の実施例において、前記第１実施例と相違する点は
、第１実施例においては、高圧ドラム８圧力で抽気蒸気
量を制御していたのに対し、低圧主蒸気管３５の蒸気タ
ービン入口圧力３６で抽気蒸気量を制御するようにした
ところである。もちろん蒸気タービン入口圧力３６のか
わりに低圧ドラム３７圧力で制御することもできる。The difference between the fourth embodiment and the first embodiment is that in the first embodiment, the amount of extracted steam was controlled by the pressure of the high-pressure drum 8, whereas the steam turbine in the low-pressure main steam pipe 35 The amount of extracted steam is controlled by the inlet pressure 36. Of course, the pressure can be controlled using the low pressure drum 37 pressure instead of the steam turbine inlet pressure 36.
第９図は抽気蒸気量と低圧主蒸気管８５の蒸気タービン
入口圧力３６、低圧ドラム３７圧力の関係を示したもの
で、ａ気タービン入ロ圧力３６を大気圧より高めに保つ
最低圧力Ｐ、まで抽気可能ということである。ここで大
気圧より高めの圧力を確保する理由は、負圧になると空
気が侵入し。FIG. 9 shows the relationship between the extracted steam amount, the steam turbine inlet pressure 36 of the low-pressure main steam pipe 85, and the low-pressure drum 37 pressure. This means that it is possible to bleed air up to The reason why we maintain a pressure higher than atmospheric pressure is that when the pressure becomes negative, air enters.
腐蝕等の問題が生ずるためである。もちろん、蒸気ター
ビン入口圧力３６の代わりに低圧ドラム３７圧力で制御
することも可能である。This is because problems such as corrosion occur. Of course, it is also possible to control with the low pressure drum 37 pressure instead of the steam turbine inlet pressure 36.
（発明の効果〕
本発明によれば、補助蒸気として排熱回収ボイラの発生
蒸気を抽気して利用する場合、過剰抽気を防止できるの
で、排熱回収ボイラの正常運転が常に可能となる効果が
ある。(Effects of the Invention) According to the present invention, when the generated steam of the exhaust heat recovery boiler is extracted and used as auxiliary steam, excessive extraction can be prevented, so that the normal operation of the exhaust heat recovery boiler is always possible. be.
第１図は本発明の第１実施例に係る複合発電プラントの
概略系統図、第２ｉ１１は蒸気抽気量と高圧ドラム圧力
、蒸発量および脱硝装置入口ガス温度の関係を表わす図
表、第３図は蒸気抽気量と高圧ドラム圧力および気水分
離泰の処理可能蒸気量の関係を示す図表、第４図は本発
明の第２実施例に係る複合発電プラントの概略系統図、
第５＠は蒸気抽気量と蒸気流量、流速の関係を示す図表
、第６図は本発明の第３実施例に係る複合発電プラント
の概略系統図、第７１ｉｉ１は蒸気抽気量と脱硝装置入
口ガス温度の関係を示す図表、第８図は本発明の第４実
施例に係る複合発電プラント概略系統図。
第９図は蒸気抽気量と低圧主蒸気管の蒸気タービン入口
圧力、低圧ドラム圧力の関係を示す図表。
第１Ｏ図は従来の複台発電プラントの概略系統図。
第１１１ｓは従来の補助蒸気系統図である。
４・・・ガスタービン、５・・・排熱回収ボイラ。
８・・・高圧ドラム、１４・・・蒸気タービン。
２１・・・補助蒸気ヘッダー、２３・・・補助ボイラ。
２４・・・高圧蒸発器出口連絡管、２７・・・圧力検知
器、２８・・・流量計、３１・・・脱硝装置。
３６・・・蒸気タービン入口圧力、Ｇ・・・排ガス。FIG. 1 is a schematic system diagram of a combined power generation plant according to the first embodiment of the present invention, FIG. A chart showing the relationship between steam extraction amount, high pressure drum pressure, and steam amount that can be processed by steam/water separation; FIG. 4 is a schematic system diagram of a combined power generation plant according to the second embodiment of the present invention;
Fig. 5 is a diagram showing the relationship between steam extraction amount, steam flow rate, and flow velocity, Fig. 6 is a schematic system diagram of a combined power generation plant according to the third embodiment of the present invention, and Fig. 71ii1 is a diagram showing the relationship between steam extraction amount and denitrification equipment inlet gas. FIG. 8 is a schematic system diagram of a combined power generation plant according to a fourth embodiment of the present invention. FIG. 9 is a chart showing the relationship between the steam extraction amount, the steam turbine inlet pressure of the low-pressure main steam pipe, and the low-pressure drum pressure. Figure 1O is a schematic system diagram of a conventional multiple power generation plant. No. 111s is a conventional auxiliary steam system diagram. 4... Gas turbine, 5... Exhaust heat recovery boiler. 8...High pressure drum, 14...Steam turbine. 21... Auxiliary steam header, 23... Auxiliary boiler. 24... High pressure evaporator outlet communication pipe, 27... Pressure detector, 28... Flow meter, 31... Denitrification device. 36... Steam turbine inlet pressure, G... Exhaust gas.
Claims (1)
気を蒸気タービンと補助蒸気系統へ供給する系統を備え
た複数の排熱回収ボイラと、蒸気を発生しその蒸気を前
記補助蒸気系統へ供給する補助ボイラと、を有し、前記
複数の排熱回収ボイラの何れか１つの排熱回収ボイラの
ドラム圧力を検知してその信号により前記補助蒸気系統
へ蒸気を供給する排熱回収ボイラと前記補助ボイラを選
択する排熱回収ボイラの補助蒸気抽気方法。 ２、前記ドラム圧力の信号に代えて、蒸気又は給水の配
管内流量あるいは配管内流速の信号とする請求項１に記
載の排熱回収ボイラの補助蒸気抽気方法。 ３、前記ドラム圧力の信号に代えて、脱硝装置入口ガス
温度の信号とする請求項１に記載の排熱回収ボイラの補
助蒸気抽気方法。 ４、前記ドラム圧力の信号に代えて、蒸気タービン入口
圧力の信号とする請求項１に記載の排熱回収ボイラの補
助蒸気抽気方法。[Claims] 1. A plurality of exhaust heat recovery boilers equipped with a system that denitrates and recovers heat from exhaust gas to generate steam and supplies the steam to a steam turbine and an auxiliary steam system; an auxiliary boiler for supplying steam to the auxiliary steam system, detecting the drum pressure of any one of the plurality of exhaust heat recovery boilers and supplying steam to the auxiliary steam system based on the signal thereof; A method for extracting auxiliary steam from an exhaust heat recovery boiler by selecting the exhaust heat recovery boiler to be supplied and the auxiliary boiler. 2. The auxiliary steam extraction method for an exhaust heat recovery boiler according to claim 1, wherein a signal of the flow rate or flow velocity in the pipe of steam or feed water is used instead of the signal of the drum pressure. 3. The auxiliary steam extraction method for an exhaust heat recovery boiler according to claim 1, wherein a signal of gas temperature at the inlet of the denitrification device is used instead of the signal of the drum pressure. 4. The auxiliary steam extraction method for an exhaust heat recovery boiler according to claim 1, wherein the drum pressure signal is replaced with a steam turbine inlet pressure signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63250370A JP2949287B2 (en) | 1988-10-04 | 1988-10-04 | Auxiliary steam extraction method for waste heat recovery boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63250370A JP2949287B2 (en) | 1988-10-04 | 1988-10-04 | Auxiliary steam extraction method for waste heat recovery boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0297801A true JPH0297801A (en) | 1990-04-10 |
| JP2949287B2 JP2949287B2 (en) | 1999-09-13 |
Family
ID=17206913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63250370A Expired - Fee Related JP2949287B2 (en) | 1988-10-04 | 1988-10-04 | Auxiliary steam extraction method for waste heat recovery boiler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2949287B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007255389A (en) * | 2006-03-24 | 2007-10-04 | Chugoku Electric Power Co Inc:The | Auxiliary steam supply device |
| WO2015104464A1 (en) | 2014-01-07 | 2015-07-16 | Novasep Process | Process for purifying aromatic amino acids |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57179310A (en) * | 1981-04-28 | 1982-11-04 | Mitsubishi Heavy Ind Ltd | Boiler change-over system for additional switching-in and disconnection in combined plant |
| JPS5840506U (en) * | 1981-09-11 | 1983-03-17 | 株式会社東芝 | Combined cycle power plant |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5840506B2 (en) * | 1977-11-08 | 1983-09-06 | 松下電器産業株式会社 | Inkjet recording method |
-
1988
- 1988-10-04 JP JP63250370A patent/JP2949287B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57179310A (en) * | 1981-04-28 | 1982-11-04 | Mitsubishi Heavy Ind Ltd | Boiler change-over system for additional switching-in and disconnection in combined plant |
| JPS5840506U (en) * | 1981-09-11 | 1983-03-17 | 株式会社東芝 | Combined cycle power plant |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007255389A (en) * | 2006-03-24 | 2007-10-04 | Chugoku Electric Power Co Inc:The | Auxiliary steam supply device |
| WO2015104464A1 (en) | 2014-01-07 | 2015-07-16 | Novasep Process | Process for purifying aromatic amino acids |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2949287B2 (en) | 1999-09-13 |
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