WO2020031716A1 - Combined cycle power plant - Google Patents

Combined cycle power plant Download PDF

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Publication number
WO2020031716A1
WO2020031716A1 PCT/JP2019/029168 JP2019029168W WO2020031716A1 WO 2020031716 A1 WO2020031716 A1 WO 2020031716A1 JP 2019029168 W JP2019029168 W JP 2019029168W WO 2020031716 A1 WO2020031716 A1 WO 2020031716A1
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Prior art keywords
steam
pipe
temperature
valve
vapor
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PCT/JP2019/029168
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French (fr)
Japanese (ja)
Inventor
肇 青木
星野　辰也
善幸 長谷川
哲也 原田
光 佐野
正憲 笠
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川崎重工業株式会社
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Application filed by 川崎重工業株式会社 filed Critical 川崎重工業株式会社
Priority to KR1020217005228A priority Critical patent/KR102512440B1/en
Priority to CN201980052536.9A priority patent/CN112534122B/en
Publication of WO2020031716A1 publication Critical patent/WO2020031716A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00—General layout or general methods of operation of complete plants
    • F01K13/02—Controlling, e.g. stopping or starting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
    • F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
    • F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
    • F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K9/00—Plants characterised by condensers arranged or modified to co-operate with the engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas- turbine plants for special use
    • F02C6/18—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas- turbine plants for special use using the waste heat of gas-turbine plants outside the plants themselves, e.g. gas-turbine power heat plants
    • 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]

Definitions

  • the present invention relates to a combined cycle power plant.
  • the combined cycle power plant includes a gas turbine, a steam turbine, an exhaust heat recovery boiler, and the like, and employs a power generation system combining a gas turbine and a steam turbine.
  • exhaust gas after working in a gas turbine is guided to an exhaust heat recovery boiler, and steam is generated using heat of the exhaust gas, and the steam drives the steam turbine.
  • Some of the combined cycle power plants are referred to as multi-shaft combined cycle power plants in order to improve the power generation efficiency, and are provided with a plurality of combinations of a gas turbine and an exhaust heat recovery boiler (for example, And Patent Document 1).
  • one exhaust heat recovery boiler may be activated while the other exhaust heat recovery boiler is operating.
  • the other steam is bypassed and sent to the condenser until the pressure of the other steam becomes equal to the pressure of the one steam.
  • the other steam has the same pressure as the one steam, the other steam is merged with the one steam.
  • the present invention provides a combined cycle power generation that can suppress the occurrence of a difference in thermal expansion in the casing of a steam turbine when steam generated in a plurality of exhaust heat recovery boilers is combined and supplied to a steam turbine.
  • the purpose is to provide a plant.
  • the combined cycle power plant of the present invention includes a first exhaust heat recovery boiler that recovers heat from exhaust gas to generate steam, a second exhaust heat recovery boiler that recovers heat from exhaust gas to generate steam, A steam turbine driven by steam, a condenser for condensing steam discharged from the steam turbine, a first steam pipe connecting the first exhaust heat recovery boiler and the steam turbine, and an upstream end Is connected to the second exhaust heat recovery boiler, a second steam pipe having a downstream end connected to the first steam pipe, a first steam valve provided in the first steam pipe, A second steam valve provided in the second steam pipe, and a branch point located upstream of the first steam valve in the first steam pipe, and a downstream end is connected to the condenser.
  • a first bypass pipe connected to the first bypass pipe and the first bypass pipe;
  • a second bypass pipe, a second bypass valve provided in the second bypass pipe, and a temperature of steam in the second steam pipe is determined from a temperature of steam in the first steam pipe. When the temperature is not within the allowable temperature range, the second steam valve is closed and the second bypass valve is opened, and the temperature of the steam in the second steam pipe is within the allowable temperature range.
  • a control device that opens the second steam valve and closes the second bypass valve.
  • the control device closes the second steam valve. And the second bypass valve is opened, so that when the temperature of the steam in the second steam pipe is not high yet, that is, when the temperature of the steam in the second steam pipe is the first steam pipe, When the temperature is lower than the temperature of the steam in the second steam, the steam in the second steam pipe is sent to the condenser. As a result, after the steam in the second steam pipe that has not been heated yet merges with the steam in the first steam pipe, the temperature of the steam after the merge does not fluctuate.
  • the combined cycle power plant is provided in the first steam pipe at a position upstream of the branch point, and detects a temperature of steam in the first steam pipe,
  • a second temperature sensor provided at a position on the upstream side of the branch point in the second steam pipe and detecting a temperature of steam in the second steam pipe;
  • a merging temperature sensor provided downstream of the position and detecting a temperature of steam in the first steam pipe, wherein the controller detects the temperature detected by the first temperature sensor and the merging temperature.
  • the apparatus is configured to determine the allowable temperature range based on the temperature detected by the temperature sensor.
  • the temperature of the steam in the second steam pipe has warmed to a level that does not cause a difference in thermal expansion in the steam turbine, and the steam in the second steam pipe is converted to the first steam.
  • the steam in the second steam pipe is converted to the first steam.
  • a warm pipe can be performed without releasing the steam to the outside and losing the steam to the outside of the system.
  • FIG. 5 is a flowchart illustrating a flow of processing of the control device according to the present embodiment.
  • CCPP combined cycle power plant
  • a combined cycle power plant 1 includes exhaust heat recovery boilers 11 and 21 connected to a gas turbine (not shown) for recovering heat from exhaust gas to generate steam, steam pipes 12 and 22, check valves 13 and 23, steam valves 14 and 24, steam turbine 40, condenser 41 for condensing steam discharged from steam turbine 40, bypass pipes 16 and 26, and bypass valve 17 , 27 and a control device 50.
  • the control device 50 is, for example, a computer having a memory such as a ROM or a RAM and a CPU, and a program stored in the ROM is executed by the CPU.
  • the steam pipe 12 connects the exhaust heat recovery boiler 11 and the steam turbine 40.
  • the upstream end of the steam pipe 22 is connected to the exhaust heat recovery boiler 21, and the downstream end is connected to a downstream portion of the steam pipe 12. Thereby, the steam in the steam pipe 22 merges with the steam in the steam pipe 12.
  • the steam valve 14 is provided in the steam pipe 12.
  • the steam valve 14 opens and closes the steam pipe 12.
  • the check valve 13 is provided on the steam pipe 12 on the upstream side of the steam valve 14.
  • the check valve 13 allows the steam flow in the steam pipe 12 in the direction from the exhaust heat recovery boiler 11 side to the steam turbine 40 side, and prevents the steam flow in the direction opposite to the above direction.
  • the steam valve 24 is provided in the steam pipe 22.
  • the steam valve 24 opens and closes the steam pipe 22.
  • the check valve 23 is provided on the steam pipe 22 on the upstream side of the steam valve 24. The check valve 23 allows the steam flow in the steam pipe 22 in the direction from the exhaust heat recovery boiler 21 toward the steam turbine 40, and prevents the steam flow in the direction opposite to the above direction.
  • the bypass pipe 16 is branched from a branch point of the steam pipe 12 located on the upstream side of the check valve 13, and a downstream end thereof is connected to the condenser 41.
  • the bypass valve 17 is provided in the bypass pipe 16 and adjusts the amount of steam flowing in the bypass pipe 16, whereby the pressure in the steam pipe 12 is controlled.
  • the bypass pipe 26 is branched from a branch point located on the upstream side of the check valve 23 of the steam pipe 22, and the downstream end thereof is connected to the condenser 41.
  • the bypass valve 27 is provided in the bypass pipe 26 and adjusts the amount of steam flowing in the bypass pipe 26, whereby the pressure in the steam pipe 22 is controlled.
  • the steam pipe 12 is provided with a temperature sensor 18 and a pressure sensor 60 at a position on the upstream side of the branch point in order from the upstream side.
  • the temperature sensor 18 detects the temperature of steam flowing on the upstream side of the branch point in the steam pipe 12 and transmits the detection result to the control device 50.
  • the pressure sensor 60 detects the pressure on the upstream side of the branch point in the steam pipe 12 and transmits the detection result to the control device 50.
  • the steam pipe 12 is provided with a temperature sensor 15 and a pressure sensor 62 at positions downstream of the connection position of the downstream end of the steam pipe 22 to the steam pipe 12 in order from the upstream side.
  • the temperature sensor 15 detects the temperature of steam (combined steam) flowing downstream of the connection position in the steam pipe 12 and transmits the detection result to the control device 50.
  • the pressure sensor 62 detects the pressure downstream of the connection position in the steam pipe 12 and transmits the detection result to the control device 50.
  • the steam pipe 22 is provided with a temperature sensor 28 and a pressure sensor 61 at an upstream position of the branch point in order from the upstream side.
  • the temperature sensor 28 detects the temperature of the steam flowing on the upstream side of the branch point in the steam pipe 22, and transmits the detection result to the control device 50.
  • the pressure sensor 61 detects the pressure on the upstream side of the branch point in the steam pipe 22 and transmits the detection result to the control device 50.
  • a compartment temperature sensor 45 for detecting the compartment temperature of the steam turbine 40 can be provided. In this case, the detection result of the vehicle interior temperature sensor 45 can be used when determining an allowable temperature range described later.
  • the steam generated by the exhaust heat recovery boiler 11 is generated by the exhaust heat recovery boiler 21 at the downstream side of the steam pipe 12 via the check valve 13 and the steam valve 14 and is controlled by the check valve.
  • the steam After joining with the steam flowing in the steam pipe 22 via the steam valve 23 and the steam valve 24, the steam is sent to the steam turbine 40.
  • the steam sent to the steam turbine 40 is discharged after working in the steam turbine 40, and the discharged steam is condensed by the condenser 41 to be condensed.
  • the combined cycle power plant 1 is provided with condensate pipes 43 and 44.
  • the upstream end of the condenser pipe 43 is connected to the bottom of the condenser 41, and the downstream end is connected to the exhaust heat recovery boiler 21.
  • a pump 42 is inserted in the condensate pipe 43.
  • the condensing pipe 44 is branched from a branch point provided on the downstream side of the condensing pipe 43, and the downstream end thereof is connected to the exhaust heat recovery boiler 11.
  • the water generated in the condenser 41 is sent to the exhaust heat recovery boiler 21 through the condenser pipe 43 under the control of the pump 42 by the control device 50, and is also discharged through the condenser pipes 43 and 44. 11 is sent. Then, the water sent to the exhaust heat recovery boilers 11 and 21 undergoes heat exchange by the exhaust heat recovery boilers 11 and 21 to become steam.
  • the control device 50 adjusts the opening of the bypass valve 17 with the steam valve 14 closed so that the pressure in the steam pipe 12 becomes the set pressure.
  • the steam in the steam pipe 12 is sent to the condenser 41 via the bypass pipe 16 until the pressure in the steam pipe 12 reaches the set pressure.
  • the control device 50 closes the bypass valve 17 and opens the steam valve 14.
  • the steam that has reached the set pressure is sent to the inlet valve of the steam turbine 40 via the steam pipe 12, and the warm pipe and the steam turbine are warmed up by a not-shown warm pipe valve, and then detected by the temperature sensor 15. If the set temperature falls within the allowable temperature range, it is sent to steam turbine 40.
  • the control device 50 closes the steam valve 24 and sets the pressure detected by the pressure sensor 61 (the pressure of the steam generated by the exhaust heat recovery boiler 21). ) Is adjusted to the same pressure as the pressure detected by the pressure sensor 60 (the pressure of the steam generated by the exhaust heat recovery boiler 11).
  • the steam from the exhaust heat recovery boiler 21 is sent to the condenser 41 until the pressure detected by the pressure sensor 61 is increased until it becomes equal to the pressure detected by the pressure sensor 60.
  • the control device 50 needs to increase the temperature of the steam from the exhaust heat recovery boiler 21 even if the pressure detected by the pressure sensor 61 reaches a pressure equivalent to the pressure detected by the pressure sensor 60.
  • the steam from the exhaust heat recovery boiler 21 is prevented from being combined with the steam from the exhaust heat recovery boiler 11 by opening the steam valve 24. That is, the controller 50 is configured to monitor not only the pressure of the steam but also the temperature. This will be described below.
  • the control device 50 acquires the temperatures detected by the temperature sensors 18, 28, 15, 45. Then, the control device 50 detects the temperature detected by the temperature sensor 28 (the temperature of the steam in the steam pipe 22) by the temperature sensor 18 (the temperature of the steam in the steam pipe 12) and the temperature sensor 15 to detect the temperature. If the temperature is not within the allowable temperature range determined based on the detected temperature (the temperature of the combined steam) and the temperature detected by the temperature sensor 45 (the temperature of the cabin of the steam turbine 40), the steam valve 24 is closed. While maintaining, the bypass valve 27 is maintained in the open state. Thus, it is possible to prevent the steam in the steam pipe 22 that has not yet been heated from joining the steam in the steam pipe 12.
  • the allowable temperature range defines a range of a temperature at which the temperature of the steam in the steam pipe 22 should be based on the temperature of the steam in the steam pipe 12, the temperature of the combined steam, and the temperature of the cabin of the steam turbine 40. Things.
  • the control device 50 opens the steam valve 24 and closes the bypass valve 27. Thereby, the steam from the exhaust heat recovery boiler 21 joins the steam from the exhaust heat recovery boiler 11, and the combined steam is sent to the steam turbine 40. Thus, the operation of connecting the exhaust heat recovery boiler 21 with the exhaust heat recovery boiler 11 is completed.
  • the control device 50 acquires each temperature from the temperature sensors 18, 28, 15, and 45 (step S1). Next, the control device 50 determines whether or not the temperature detected by the temperature sensor 28 is within the above-described allowable temperature range (step S2). If the temperature detected by the temperature sensor 28 is not within the allowable temperature range (NO in step S2), the steam valve 24 is kept closed and the bypass valve 27 is kept open (step S3). Thereafter, the control device 50 monitors the pressure. On the other hand, when the temperature detected by temperature sensor 28 is within the allowable temperature range (YES in step S2), control device 50 opens steam valve 24 and closes bypass valve 27 (step S4). ), And then monitor the pressure.
  • the temperature of the steam in the steam pipe 22 is the temperature of the steam in the steam pipe 12, the temperature of the combined steam, and the temperature of the cabin of the steam turbine 40. If the temperature is not within the allowable temperature range determined on the basis of the above, the steam valve 24 is closed and the bypass valve 27 is opened by the control device 50, so that the temperature of the steam in the steam pipe 22 is not yet high. At that time, that is, when the temperature of the steam in the steam pipe 22 is lower than the temperature of the steam in the steam pipe 12, the steam in the steam pipe 22 is sent to the condenser 41.
  • the temperature of the steam after the merge does not fluctuate. Therefore, it is possible to prevent or suppress the occurrence of a difference in thermal expansion in the cabin of the steam turbine 40 due to a change in the steam temperature after the merging. Further, when a temperature reducer (desuperheater) is provided on the upstream side of the steam pipe 22 and a failure occurs in the temperature reducer, when the exhaust heat recovery boiler 21 is operated, It is possible to prevent the steam in the pipe 22 from joining the steam in the steam pipe 12.
  • a temperature reducer desuperheater
  • the steam valve 24 is kept closed and the bypass valve 27 is kept open.
  • the present invention is not limited to this.
  • the steam valve 24 is kept closed and The bypass valve 27 may be configured to be kept open.
  • one exhaust heat recovery boiler 21 is provided as the second exhaust heat recovery boiler.
  • the present invention is not limited to this, and two or more other exhaust heat recovery boilers are provided. May be provided to perform these connecting operations.
  • the steam valves 14 and 24 employ the on-off valves that can open and close the steam pipes 12 and 22.
  • the present invention is not limited to this.
  • a flow control valve for controlling the amount of steam may be employed.
  • downstream end of the steam pipe 22 is directly connected to a portion of the steam pipe 12 downstream of the steam valve 14, but the present invention is not limited to this, and the steam pipe 22 may be connected via a steam header.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Turbines (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

Provided is a combined cycle power plant configured so that, when vapor produced by each of a plurality of waste heat recovery boilers is merged and supplied to a vapor turbine, the occurrence of a thermal elongation difference in the casing of the vapor turbine can be prevented. This power plant is provided with: first vapor piping for connecting a first waste heat recovery boiler and a vapor turbine; second vapor piping having an upstream end which is connected to a second waste heat recovery boiler, and having a downstream end connected to the first vapor piping; first bypass piping branched at a branch point upstream of a first vapor valve in the first vapor piping, and having a downstream end connected to a condenser; second bypass piping branched at a branch point upstream of a second vapor valve in the second vapor piping, and having a downstream end connected to a condenser; and a control device which, when the temperature of vapor within the second vapor piping is not in a permissible temperature range determined from the temperature of vapor within the first vapor piping, sets the second vapor valve to a closed state and sets the second bypass valve to an open state.

Description

コンバインドサイクル発電プラントCombined cycle power plant
　本発明は、コンバインドサイクル発電プラントに関する。 The present invention relates to a combined cycle power plant.
　近年、エネルギーをより効率的に利用するために、コンバインドサイクル発電プラントが使用されている。コンバインドサイクル発電プラントは、ガスタービン、蒸気タービン、排熱回収ボイラ等を備えており、ガスタービンと蒸気タービンとを組み合わせた発電方式を採用するものである。このようなコンバインドサイクル発電プラントでは、ガスタービンにて仕事をした後の排ガスを排熱回収ボイラに導き、排ガスの熱を利用して蒸気を発生させ、その蒸気により蒸気タービンを駆動する。 In recent years, combined cycle power plants have been used to utilize energy more efficiently. The combined cycle power plant includes a gas turbine, a steam turbine, an exhaust heat recovery boiler, and the like, and employs a power generation system combining a gas turbine and a steam turbine. In such a combined cycle power plant, exhaust gas after working in a gas turbine is guided to an exhaust heat recovery boiler, and steam is generated using heat of the exhaust gas, and the steam drives the steam turbine.
　コンバインドサイクル発電プラントには、発電効率の向上に資するため、多軸型コンバインドサイクル発電プラントと称されるもので、ガスタービンと排熱回収ボイラとの組み合わせが複数組設けられたものがある（例えば、特許文献１参照）。このような多軸型コンバインドサイクル発電プラントでは、一方の排熱回収ボイラが稼働中に他方の排熱回収ボイラを起動することがある。この場合、他方の蒸気の圧力が一方の蒸気の圧力と同等になるまでの間は他方の蒸気をバイパスさせて復水器に送る。他方の蒸気が一方の蒸気と同等の圧力になったときに他方の蒸気を一方の蒸気に合流させるようにしている。 Some of the combined cycle power plants are referred to as multi-shaft combined cycle power plants in order to improve the power generation efficiency, and are provided with a plurality of combinations of a gas turbine and an exhaust heat recovery boiler (for example, And Patent Document 1). In such a multi-shaft combined cycle power plant, one exhaust heat recovery boiler may be activated while the other exhaust heat recovery boiler is operating. In this case, the other steam is bypassed and sent to the condenser until the pressure of the other steam becomes equal to the pressure of the one steam. When the other steam has the same pressure as the one steam, the other steam is merged with the one steam.
特許第６００４５３３号公報Japanese Patent No. 6004533
　しかしながら、従来のように他方の排熱回収ボイラにより生成される蒸気の圧力レベルだけを考慮して当該蒸気を合流させると、一方の排熱回収ボイラの蒸気の温度と他方の排熱回収ボイラの蒸気の温度とが大きく異なっている場合には、合流後の蒸気の温度が変動してしまい、蒸気タービンの車室（ロータを収容するケーシング）に熱伸び差が生じることがある。そのため、蒸気タービンに振動が発生する恐れがある。 However, when the steam is merged in consideration of only the pressure level of the steam generated by the other exhaust heat recovery boiler, the temperature of the steam of one exhaust heat recovery boiler and the temperature of the other If the temperature of the steam greatly differs from the temperature of the steam, the temperature of the steam after the merging fluctuates, and a difference in thermal expansion may occur in a casing (a casing accommodating the rotor) of the steam turbine. Therefore, there is a possibility that vibration is generated in the steam turbine.
　そこで、本発明は、複数の排熱回収ボイラに生成される蒸気を合流させて蒸気タービンに供給する場合に、蒸気タービンの車室に熱伸び差が生じることを抑制することができるコンバインドサイクル発電プラントを提供することを目的とする。 In view of the above, the present invention provides a combined cycle power generation that can suppress the occurrence of a difference in thermal expansion in the casing of a steam turbine when steam generated in a plurality of exhaust heat recovery boilers is combined and supplied to a steam turbine. The purpose is to provide a plant.
　本発明のコンバインドサイクル発電プラントは、排ガスから熱を回収して蒸気を生成する第１の排熱回収ボイラと、排ガスから熱を回収して蒸気を生成する第２の排熱回収ボイラと、前記蒸気によって駆動される蒸気タービンと、前記蒸気タービンから排出された蒸気を凝縮する復水器と、前記第１の排熱回収ボイラと前記蒸気タービンとを接続する第１の蒸気配管と、上流端が前記第２の排熱回収ボイラに接続され、下流端が前記第１の蒸気配管に接続された第２の蒸気配管と、前記第１の蒸気配管に設けられた第１の蒸気弁と、前記第２の蒸気配管に設けられた第２の蒸気弁と、前記第１の蒸気配管の前記第１の蒸気弁の上流側に位置する分岐点から分岐され、下流端が前記復水器に接続された第１のバイパス配管と、前記第１のバイパス配管に設けられた第１のバイパス弁と、前記第２の蒸気配管の前記第２の蒸気弁の上流側に位置する分岐点から分岐され、下流端が前記復水器に接続された第２のバイパス配管と、前記第２のバイパス配管に設けられた第２のバイパス弁と、前記第２の蒸気配管内の蒸気の温度が前記第１の蒸気配管内の蒸気の温度から決定される許容温度範囲にない場合に、前記第２の蒸気弁を閉状態にすると共に前記第２のバイパス弁を開状態にし、前記第２の蒸気配管内の蒸気の温度が前記許容温度範囲にある場合に、前記第２の蒸気弁を開状態にすると共に前記第２のバイパス弁を閉状態にする制御装置と、を備えているものである。 The combined cycle power plant of the present invention includes a first exhaust heat recovery boiler that recovers heat from exhaust gas to generate steam, a second exhaust heat recovery boiler that recovers heat from exhaust gas to generate steam, A steam turbine driven by steam, a condenser for condensing steam discharged from the steam turbine, a first steam pipe connecting the first exhaust heat recovery boiler and the steam turbine, and an upstream end Is connected to the second exhaust heat recovery boiler, a second steam pipe having a downstream end connected to the first steam pipe, a first steam valve provided in the first steam pipe, A second steam valve provided in the second steam pipe, and a branch point located upstream of the first steam valve in the first steam pipe, and a downstream end is connected to the condenser. A first bypass pipe connected to the first bypass pipe and the first bypass pipe; A first bypass valve provided in the water supply pipe, and a second bypass pipe branched from a branch point of the second steam pipe located upstream of the second steam valve, the downstream end of which is connected to the condenser. A second bypass pipe, a second bypass valve provided in the second bypass pipe, and a temperature of steam in the second steam pipe is determined from a temperature of steam in the first steam pipe. When the temperature is not within the allowable temperature range, the second steam valve is closed and the second bypass valve is opened, and the temperature of the steam in the second steam pipe is within the allowable temperature range. And a control device that opens the second steam valve and closes the second bypass valve.
　本発明に従えば、第２の蒸気配管内の蒸気の温度が第１の蒸気配管内の蒸気の温度から決定される許容温度範囲にない場合に、制御装置により第２の蒸気弁が閉状態にされると共に第２のバイパス弁が開状態にされるので、第２の蒸気配管内の蒸気の温度がまだ高くないとき、即ち第２の蒸気配管内の蒸気の温度が第１の蒸気配管内の蒸気の温度に比べて低いときに、第２の蒸気配管内の蒸気が復水器に送られるようになっている。これによって、まだ暖まっていない第２の蒸気配管内の蒸気が第１の蒸気配管内の蒸気に合流したあと合流後の蒸気の温度が変動してしまうことが起こらない。これによって、合流後の蒸気温度の変動に起因して蒸気タービンの車室に熱伸び差が生じることを防止又は抑制することができる。また、第２の蒸気配管の上流側に減温器（デスーパーヒータ）が設けられている場合でこの減温器に不具合が生じた場合に、第２の排熱回収ボイラの運転時に減温されていない第２の蒸気配管内の蒸気が第１の蒸気配管内の蒸気に合流することを回避することができる。 According to the present invention, when the temperature of the steam in the second steam pipe is not within the allowable temperature range determined from the temperature of the steam in the first steam pipe, the control device closes the second steam valve. And the second bypass valve is opened, so that when the temperature of the steam in the second steam pipe is not high yet, that is, when the temperature of the steam in the second steam pipe is the first steam pipe, When the temperature is lower than the temperature of the steam in the second steam, the steam in the second steam pipe is sent to the condenser. As a result, after the steam in the second steam pipe that has not been heated yet merges with the steam in the first steam pipe, the temperature of the steam after the merge does not fluctuate. As a result, it is possible to prevent or suppress the occurrence of a difference in thermal expansion in the casing of the steam turbine due to the change in the steam temperature after the merging. Further, if a desuperheater (desuperheater) is provided upstream of the second steam pipe and this desuperheater fails, the temperature is reduced during operation of the second exhaust heat recovery boiler. It is possible to prevent steam in the second steam pipe that has not been merged with steam in the first steam pipe.
　上記発明において、コンバインドサイクル発電プラントは、前記第１の蒸気配管において前記分岐点の上流側の位置に設けられ、前記第１の蒸気配管内の蒸気の温度を検出する第１の温度センサと、前記第２の蒸気配管において前記分岐点の上流側の位置に設けられ、前記第２の蒸気配管内の蒸気の温度を検出する第２の温度センサと、前記第１の蒸気配管において前記合流の位置よりも下流側に設けられ、前記第１の蒸気配管内の蒸気の温度を検出する合流温度センサとをさらに備え、前記制御装置は、前記第１の温度センサにより検出された温度および前記合流温度センサにより検出された温度に基づき前記許容温度範囲を決定するように構成されていることが望ましい。 In the above invention, the combined cycle power plant is provided in the first steam pipe at a position upstream of the branch point, and detects a temperature of steam in the first steam pipe, A second temperature sensor provided at a position on the upstream side of the branch point in the second steam pipe and detecting a temperature of steam in the second steam pipe; A merging temperature sensor provided downstream of the position and detecting a temperature of steam in the first steam pipe, wherein the controller detects the temperature detected by the first temperature sensor and the merging temperature. Desirably, the apparatus is configured to determine the allowable temperature range based on the temperature detected by the temperature sensor.
　上記構成に従えば、第２の蒸気配管内の蒸気の温度が蒸気タービン内の熱伸び差が生じない程度まで暖まったことを適切に判断して、第２の蒸気配管内の蒸気を第１の蒸気配管内の蒸気に合流させることができる。また、第２の蒸気配管内の蒸気を第２のバイパス弁を介して復水器に送ることで、蒸気を大気放出して系外へ損失させることなく、暖管を行うことができる。 According to the above configuration, it is appropriately determined that the temperature of the steam in the second steam pipe has warmed to a level that does not cause a difference in thermal expansion in the steam turbine, and the steam in the second steam pipe is converted to the first steam. To the steam in the steam pipe. In addition, by sending the steam in the second steam pipe to the condenser via the second bypass valve, a warm pipe can be performed without releasing the steam to the outside and losing the steam to the outside of the system.
　本発明によれば、複数の排熱回収ボイラに生成される蒸気を合流させて蒸気タービンに供給する場合に、蒸気タービンの車室に熱伸び差が生じることを抑制することができる。 According to the present invention, when steam generated in a plurality of exhaust heat recovery boilers is combined and supplied to a steam turbine, it is possible to suppress a difference in thermal expansion in a casing of the steam turbine.
本発明の一実施形態に係るコンバインドサイクル発電プラントの概略構成図である。It is a schematic structure figure of a combined cycle power plant concerning one embodiment of the present invention. 本実施形態の制御装置の処理の流れを示すフローチャートである。5 is a flowchart illustrating a flow of processing of the control device according to the present embodiment.
　以下、本発明に係る実施形態のコンバインドサイクル発電プラント（ＣＣＰＰ：Combined Cycle Power Plant）について図面を参照して説明する。以下に説明するコンバインドサイクル発電プラントは、本発明の一実施形態に過ぎない。従って、本発明は実施形態に限定されず、発明の趣旨を逸脱しない範囲で追加、削除、変更が可能である。 Hereinafter, a combined cycle power plant (CCPP) according to an embodiment of the present invention will be described with reference to the drawings. The combined cycle power plant described below is only one embodiment of the present invention. Therefore, the present invention is not limited to the embodiment, and can be added, deleted, or changed without departing from the spirit of the invention.
　図１に示すように、本実施形態に係るコンバインドサイクル発電プラント１は、図示しないガスタービンに接続され排ガスから熱を回収して蒸気を生成する排熱回収ボイラ１１，２１と、蒸気配管１２，２２と、逆止弁１３，２３と、蒸気弁１４，２４と、蒸気タービン４０と、蒸気タービン４０から排出された蒸気を凝縮する復水器４１と、バイパス配管１６，２６と、バイパス弁１７，２７と、制御装置５０とを備えている。制御装置５０は、例えばＲＯＭやＲＡＭなどのメモリおよびＣＰＵを有するコンピュータであり、ＲＯＭに格納されたプログラムがＣＰＵにより実行される。 As shown in FIG. 1, a combined cycle power plant 1 according to the present embodiment includes exhaust heat recovery boilers 11 and 21 connected to a gas turbine (not shown) for recovering heat from exhaust gas to generate steam, steam pipes 12 and 22, check valves 13 and 23, steam valves 14 and 24, steam turbine 40, condenser 41 for condensing steam discharged from steam turbine 40, bypass pipes 16 and 26, and bypass valve 17 , 27 and a control device 50. The control device 50 is, for example, a computer having a memory such as a ROM or a RAM and a CPU, and a program stored in the ROM is executed by the CPU.
　蒸気配管１２は、排熱回収ボイラ１１と蒸気タービン４０とを接続する。また、蒸気配管２２の上流端は排熱回収ボイラ２１に接続され、その下流端は蒸気配管１２の下流側部分に接続されている。これにより、蒸気配管２２内の蒸気が蒸気配管１２内の蒸気に合流するようになっている。 The steam pipe 12 connects the exhaust heat recovery boiler 11 and the steam turbine 40. The upstream end of the steam pipe 22 is connected to the exhaust heat recovery boiler 21, and the downstream end is connected to a downstream portion of the steam pipe 12. Thereby, the steam in the steam pipe 22 merges with the steam in the steam pipe 12.
　蒸気弁１４は蒸気配管１２に設けられている。蒸気弁１４は蒸気配管１２を開放および閉鎖する。また、逆止弁１３は、蒸気配管１２において蒸気弁１４の上流側に設けられている。逆止弁１３は、蒸気配管１２において排熱回収ボイラ１１側から蒸気タービン４０側に向かう方向の蒸気の流れを許容し、前記方向とは逆方向の蒸気の流れを阻止する。同様に、蒸気弁２４は蒸気配管２２に設けられている。蒸気弁２４は蒸気配管２２を開放および閉鎖する。また、逆止弁２３は、蒸気配管２２において蒸気弁２４の上流側に設けられている。逆止弁２３は、蒸気配管２２において排熱回収ボイラ２１側から蒸気タービン４０側に向かう方向の蒸気の流れを許容し、前記方向とは逆方向の蒸気の流れを阻止する。 The steam valve 14 is provided in the steam pipe 12. The steam valve 14 opens and closes the steam pipe 12. The check valve 13 is provided on the steam pipe 12 on the upstream side of the steam valve 14. The check valve 13 allows the steam flow in the steam pipe 12 in the direction from the exhaust heat recovery boiler 11 side to the steam turbine 40 side, and prevents the steam flow in the direction opposite to the above direction. Similarly, the steam valve 24 is provided in the steam pipe 22. The steam valve 24 opens and closes the steam pipe 22. The check valve 23 is provided on the steam pipe 22 on the upstream side of the steam valve 24. The check valve 23 allows the steam flow in the steam pipe 22 in the direction from the exhaust heat recovery boiler 21 toward the steam turbine 40, and prevents the steam flow in the direction opposite to the above direction.
　バイパス配管１６は、蒸気配管１２の逆止弁１３の上流側に位置する分岐点から分岐され、その下流端は復水器４１に接続されている。バイパス弁１７は、バイパス配管１６に設けられ、バイパス配管１６内を流れる蒸気の量を調節するもので、これにより蒸気配管１２内の圧力が制御される。同様に、バイパス配管２６は、蒸気配管２２の逆止弁２３の上流側に位置する分岐点から分岐され、その下流端は復水器４１に接続されている。バイパス弁２７は、バイパス配管２６に設けられ、バイパス配管２６内を流れる蒸気の量を調節するもので、これにより蒸気配管２２内の圧力が制御される。 The bypass pipe 16 is branched from a branch point of the steam pipe 12 located on the upstream side of the check valve 13, and a downstream end thereof is connected to the condenser 41. The bypass valve 17 is provided in the bypass pipe 16 and adjusts the amount of steam flowing in the bypass pipe 16, whereby the pressure in the steam pipe 12 is controlled. Similarly, the bypass pipe 26 is branched from a branch point located on the upstream side of the check valve 23 of the steam pipe 22, and the downstream end thereof is connected to the condenser 41. The bypass valve 27 is provided in the bypass pipe 26 and adjusts the amount of steam flowing in the bypass pipe 26, whereby the pressure in the steam pipe 22 is controlled.
　蒸気配管１２には、上記分岐点の上流側の位置に温度センサ１８および圧力センサ６０が上流側から順に設けられている。温度センサ１８は、蒸気配管１２内の上記分岐点の上流側を流れる蒸気の温度を検出し、その検出結果を制御装置５０に送信する。圧力センサ６０は、蒸気配管１２内の上記分岐点の上流側の圧力を検出し、その検出結果を制御装置５０に送信する。さらに、蒸気配管１２には、蒸気配管１２に対する蒸気配管２２の下流端の接続位置よりも下流側の位置に温度センサ１５および圧力センサ６２が上流側から順に設けられている。温度センサ１５は、蒸気配管１２内の上記接続位置よりも下流側を流れる蒸気（合流蒸気）の温度を検出し、その検出結果を制御装置５０に送信する。圧力センサ６２は、蒸気配管１２内の上記接続位置よりも下流側の圧力を検出し、その検出結果を制御装置５０に送信する。 (4) The steam pipe 12 is provided with a temperature sensor 18 and a pressure sensor 60 at a position on the upstream side of the branch point in order from the upstream side. The temperature sensor 18 detects the temperature of steam flowing on the upstream side of the branch point in the steam pipe 12 and transmits the detection result to the control device 50. The pressure sensor 60 detects the pressure on the upstream side of the branch point in the steam pipe 12 and transmits the detection result to the control device 50. Further, the steam pipe 12 is provided with a temperature sensor 15 and a pressure sensor 62 at positions downstream of the connection position of the downstream end of the steam pipe 22 to the steam pipe 12 in order from the upstream side. The temperature sensor 15 detects the temperature of steam (combined steam) flowing downstream of the connection position in the steam pipe 12 and transmits the detection result to the control device 50. The pressure sensor 62 detects the pressure downstream of the connection position in the steam pipe 12 and transmits the detection result to the control device 50.
　蒸気配管１２と同様に、蒸気配管２２には、上記分岐点の上流側の位置に温度センサ２８および圧力センサ６１が上流側から順に設けられている。温度センサ２８は、蒸気配管２２内の上記分岐点の上流側を流れる蒸気の温度を検出し、その検出結果を制御装置５０に送信する。圧力センサ６１は、蒸気配管２２内の上記分岐点の上流側の圧力を検出し、その検出結果を制御装置５０に送信する。なお、蒸気タービン４０の車室の温度を検出する車室温度センサ４５を設けることができる。この場合、車室温度センサ４５の検出結果を後述の許容温度範囲を決定する際に用いることができる。 Similar to the steam pipe 12, the steam pipe 22 is provided with a temperature sensor 28 and a pressure sensor 61 at an upstream position of the branch point in order from the upstream side. The temperature sensor 28 detects the temperature of the steam flowing on the upstream side of the branch point in the steam pipe 22, and transmits the detection result to the control device 50. The pressure sensor 61 detects the pressure on the upstream side of the branch point in the steam pipe 22 and transmits the detection result to the control device 50. It should be noted that a compartment temperature sensor 45 for detecting the compartment temperature of the steam turbine 40 can be provided. In this case, the detection result of the vehicle interior temperature sensor 45 can be used when determining an allowable temperature range described later.
　上記の構成において、排熱回収ボイラ１１で生成された蒸気は、逆止弁１３および蒸気弁１４を介して蒸気配管１２の下流側の部分で、排熱回収ボイラ２１で生成されて逆止弁２３および蒸気弁２４を介して蒸気配管２２内を流れてきた蒸気と合流した後、蒸気タービン４０に送られる。蒸気タービン４０に送られた蒸気は蒸気タービン４０で仕事をした後排出され、排出された蒸気は復水器４１で凝縮され復水となる。 In the above configuration, the steam generated by the exhaust heat recovery boiler 11 is generated by the exhaust heat recovery boiler 21 at the downstream side of the steam pipe 12 via the check valve 13 and the steam valve 14 and is controlled by the check valve. After joining with the steam flowing in the steam pipe 22 via the steam valve 23 and the steam valve 24, the steam is sent to the steam turbine 40. The steam sent to the steam turbine 40 is discharged after working in the steam turbine 40, and the discharged steam is condensed by the condenser 41 to be condensed.
　コンバインドサイクル発電プラント１には、復水配管４３，４４が設けられている。この復水配管４３の上流端は復水器４１の底部に接続され、その下流端は排熱回収ボイラ２１に接続されている。復水配管４３にはポンプ４２が介挿されている。また、復水配管４４は復水配管４３の下流側に設けられた分岐点から分岐され、その下流端は排熱回収ボイラ１１に接続されている。この構成において、復水器４１で生成された水は、制御装置５０によるポンプ４２の制御によって復水配管４３を通じて排熱回収ボイラ２１に送られると共に、復水配管４３，４４を通じて排熱回収ボイラ１１に送られるようになっている。そして、排熱回収ボイラ１１，２１に送られた水は排熱回収ボイラ１１，２１により熱交換されて蒸気となる。 復 The combined cycle power plant 1 is provided with condensate pipes 43 and 44. The upstream end of the condenser pipe 43 is connected to the bottom of the condenser 41, and the downstream end is connected to the exhaust heat recovery boiler 21. A pump 42 is inserted in the condensate pipe 43. The condensing pipe 44 is branched from a branch point provided on the downstream side of the condensing pipe 43, and the downstream end thereof is connected to the exhaust heat recovery boiler 11. In this configuration, the water generated in the condenser 41 is sent to the exhaust heat recovery boiler 21 through the condenser pipe 43 under the control of the pump 42 by the control device 50, and is also discharged through the condenser pipes 43 and 44. 11 is sent. Then, the water sent to the exhaust heat recovery boilers 11 and 21 undergoes heat exchange by the exhaust heat recovery boilers 11 and 21 to become steam.
　次に、排熱回収ボイラ１１が最初に起動された後、排熱回収ボイラ２１が続いて起動される場合、即ち排熱回収ボイラ１１により生成された蒸気が蒸気タービン４０に送られている際に、排熱回収ボイラ２１を起動させる場合の制御装置５０の制御について説明する。 Next, when the exhaust heat recovery boiler 11 is first started and then the exhaust heat recovery boiler 21 is subsequently started, that is, when the steam generated by the exhaust heat recovery boiler 11 is being sent to the steam turbine 40. Next, control of the control device 50 when starting the exhaust heat recovery boiler 21 will be described.
　制御装置５０は、蒸気配管１２内の圧力が設定圧力になるよう蒸気弁１４を閉状態にした状態でバイパス弁１７の開度を調節する。この場合、蒸気配管１２内の圧力が設定圧力に達するまでは、蒸気配管１２内の蒸気はバイパス配管１６を介して復水器４１に送られる。そして、蒸気配管１２内の圧力が設定圧力に達すれば、制御装置５０はバイパス弁１７を閉状態にすると共に蒸気弁１４を開状態にする。これにより、設定圧力に達した蒸気が蒸気配管１２を介して蒸気タービン４０の入口弁まで送られ、図略の暖管弁により暖管と蒸気タービン暖機を行った後、温度センサ１５により検出された温度が許容温度範囲内に入れば蒸気タービン４０に送られる。 The control device 50 adjusts the opening of the bypass valve 17 with the steam valve 14 closed so that the pressure in the steam pipe 12 becomes the set pressure. In this case, the steam in the steam pipe 12 is sent to the condenser 41 via the bypass pipe 16 until the pressure in the steam pipe 12 reaches the set pressure. When the pressure in the steam pipe 12 reaches the set pressure, the control device 50 closes the bypass valve 17 and opens the steam valve 14. As a result, the steam that has reached the set pressure is sent to the inlet valve of the steam turbine 40 via the steam pipe 12, and the warm pipe and the steam turbine are warmed up by a not-shown warm pipe valve, and then detected by the temperature sensor 15. If the set temperature falls within the allowable temperature range, it is sent to steam turbine 40.
　続いて、制御装置５０は、排熱回収ボイラ２１が起動される際に、蒸気弁２４を閉状態にすると共に圧力センサ６１により検出された圧力（排熱回収ボイラ２１により生成された蒸気の圧力）が圧力センサ６０により検出された圧力（排熱回収ボイラ１１により生成された蒸気の圧力）と同等になるようにバイパス弁２７の開度を調節する。圧力センサ６１により検出された圧力が圧力センサ６０により検出された圧力と同等になるまで昇圧されるまでの間、排熱回収ボイラ２１からの蒸気は復水器４１に送られる。ここで、制御装置５０は、圧力センサ６１により検出された圧力が圧力センサ６０により検出された圧力と同等な圧力に達しても、排熱回収ボイラ２１からの蒸気の温度が昇温されていなければ、蒸気弁２４を開状態にして排熱回収ボイラ２１からの蒸気を排熱回収ボイラ１１からの蒸気に合流させないようにする。つまり、制御装置５０は、蒸気の圧力監視だけでなく温度監視をも行うように構成されている。この点について次に説明する。 Subsequently, when the exhaust heat recovery boiler 21 is started, the control device 50 closes the steam valve 24 and sets the pressure detected by the pressure sensor 61 (the pressure of the steam generated by the exhaust heat recovery boiler 21). ) Is adjusted to the same pressure as the pressure detected by the pressure sensor 60 (the pressure of the steam generated by the exhaust heat recovery boiler 11). The steam from the exhaust heat recovery boiler 21 is sent to the condenser 41 until the pressure detected by the pressure sensor 61 is increased until it becomes equal to the pressure detected by the pressure sensor 60. Here, the control device 50 needs to increase the temperature of the steam from the exhaust heat recovery boiler 21 even if the pressure detected by the pressure sensor 61 reaches a pressure equivalent to the pressure detected by the pressure sensor 60. For example, the steam from the exhaust heat recovery boiler 21 is prevented from being combined with the steam from the exhaust heat recovery boiler 11 by opening the steam valve 24. That is, the controller 50 is configured to monitor not only the pressure of the steam but also the temperature. This will be described below.
　制御装置５０は、温度センサ１８，２８，１５，４５により検出された各温度を取得する。そして、制御装置５０は、温度センサ２８により検出された温度（蒸気配管２２内の蒸気の温度）が温度センサ１８により検出された温度（蒸気配管１２内の蒸気の温度）、温度センサ１５により検出された温度（合流蒸気の温度）、および温度センサ４５により検出された温度（蒸気タービン４０の車室の温度）に基づき決定される許容温度範囲にない場合には、蒸気弁２４を閉状態に維持すると共にバイパス弁２７を開状態に維持する。これによって、まだ暖まっていない蒸気配管２２内の蒸気が蒸気配管１２内の蒸気に合流することを回避することができる。なお、上記許容温度範囲は、蒸気配管１２内の蒸気の温度、合流蒸気の温度、および蒸気タービン４０の車室の温度から、蒸気配管２２内の蒸気の温度があるべき温度の範囲を規定するものである。 The control device 50 acquires the temperatures detected by the temperature sensors 18, 28, 15, 45. Then, the control device 50 detects the temperature detected by the temperature sensor 28 (the temperature of the steam in the steam pipe 22) by the temperature sensor 18 (the temperature of the steam in the steam pipe 12) and the temperature sensor 15 to detect the temperature. If the temperature is not within the allowable temperature range determined based on the detected temperature (the temperature of the combined steam) and the temperature detected by the temperature sensor 45 (the temperature of the cabin of the steam turbine 40), the steam valve 24 is closed. While maintaining, the bypass valve 27 is maintained in the open state. Thus, it is possible to prevent the steam in the steam pipe 22 that has not yet been heated from joining the steam in the steam pipe 12. The allowable temperature range defines a range of a temperature at which the temperature of the steam in the steam pipe 22 should be based on the temperature of the steam in the steam pipe 12, the temperature of the combined steam, and the temperature of the cabin of the steam turbine 40. Things.
　その後、蒸気配管２２内の蒸気の温度が上記許容温度範囲に入れば、制御装置５０は、蒸気弁２４を開状態にすると共にバイパス弁２７を閉状態にする。これにより、排熱回収ボイラ１１からの蒸気に排熱回収ボイラ２１からの蒸気が合流し、その合流蒸気が蒸気タービン４０に送られる。これにより、排熱回収ボイラ１１系統に対する排熱回収ボイラ２１系統の繋ぎ込み操作が完了する。 Thereafter, when the temperature of the steam in the steam pipe 22 falls within the allowable temperature range, the control device 50 opens the steam valve 24 and closes the bypass valve 27. Thereby, the steam from the exhaust heat recovery boiler 21 joins the steam from the exhaust heat recovery boiler 11, and the combined steam is sent to the steam turbine 40. Thus, the operation of connecting the exhaust heat recovery boiler 21 with the exhaust heat recovery boiler 11 is completed.
　続いて、制御装置５０による温度監視制御の流れについてフローチャートを参照しつつ説明する。 Next, the flow of the temperature monitoring control by the control device 50 will be described with reference to a flowchart.
　図２に示すように、制御装置５０は、圧力条件が成立後、温度センサ１８，２８，１５，４５から各温度を取得する（ステップＳ１）。次に、制御装置５０は、温度センサ２８により検出された温度が上述の許容温度範囲内にあるか否かを判別する（ステップＳ２）。温度センサ２８により検出された温度が許容温度範囲内にない場合には（ステップＳ２でＮＯ）、蒸気弁２４を閉状態に維持すると共にバイパス弁２７を開状態に維持する（ステップＳ３）。その後、制御装置５０は圧力監視を行う。一方、温度センサ２８により検出された温度が許容温度範囲内にある場合には（ステップＳ２でＹＥＳ）、制御装置５０は蒸気弁２４を開状態にすると共にバイパス弁２７を閉状態にし（ステップＳ４）、その後圧力監視を行う。 As shown in FIG. 2, after the pressure condition is satisfied, the control device 50 acquires each temperature from the temperature sensors 18, 28, 15, and 45 (step S1). Next, the control device 50 determines whether or not the temperature detected by the temperature sensor 28 is within the above-described allowable temperature range (step S2). If the temperature detected by the temperature sensor 28 is not within the allowable temperature range (NO in step S2), the steam valve 24 is kept closed and the bypass valve 27 is kept open (step S3). Thereafter, the control device 50 monitors the pressure. On the other hand, when the temperature detected by temperature sensor 28 is within the allowable temperature range (YES in step S2), control device 50 opens steam valve 24 and closes bypass valve 27 (step S4). ), And then monitor the pressure.
　以上説明したように、本実施形態のコンバインドサイクル発電プラント１においては、蒸気配管２２内の蒸気の温度が蒸気配管１２内の蒸気の温度、合流蒸気の温度、および蒸気タービン４０の車室の温度に基づき決定される許容温度範囲にない場合に、制御装置５０により蒸気弁２４が閉状態にされると共にバイパス弁２７が開状態にされるので、蒸気配管２２内の蒸気の温度がまだ高くないとき、即ち蒸気配管２２内の蒸気の温度が蒸気配管１２内の蒸気の温度に比べて低いときに、蒸気配管２２内の蒸気が復水器４１に送られるようになっている。これによって、まだ暖まっていない蒸気配管２２内の蒸気が蒸気配管１２内の蒸気に合流したあと合流後の蒸気の温度が変動してしまうことが起こらない。したがって、合流後の蒸気温度の変動に起因して蒸気タービン４０の車室に熱伸び差が生じることを防止又は抑制することができる。また、蒸気配管２２の上流側に減温器（デスーパーヒータ）が設けられている場合でこの減温器に不具合が生じた場合に、排熱回収ボイラ２１の運転時に減温されていない蒸気配管２２内の蒸気が蒸気配管１２内の蒸気に合流することを回避することができる。 As described above, in the combined cycle power plant 1 of the present embodiment, the temperature of the steam in the steam pipe 22 is the temperature of the steam in the steam pipe 12, the temperature of the combined steam, and the temperature of the cabin of the steam turbine 40. If the temperature is not within the allowable temperature range determined on the basis of the above, the steam valve 24 is closed and the bypass valve 27 is opened by the control device 50, so that the temperature of the steam in the steam pipe 22 is not yet high. At that time, that is, when the temperature of the steam in the steam pipe 22 is lower than the temperature of the steam in the steam pipe 12, the steam in the steam pipe 22 is sent to the condenser 41. Thus, after the steam in the steam pipe 22 that has not yet been heated merges with the steam in the steam pipe 12, the temperature of the steam after the merge does not fluctuate. Therefore, it is possible to prevent or suppress the occurrence of a difference in thermal expansion in the cabin of the steam turbine 40 due to a change in the steam temperature after the merging. Further, when a temperature reducer (desuperheater) is provided on the upstream side of the steam pipe 22 and a failure occurs in the temperature reducer, when the exhaust heat recovery boiler 21 is operated, It is possible to prevent the steam in the pipe 22 from joining the steam in the steam pipe 12.
　（他の実施形態）
　本発明は上述した実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲で種々の変形が可能である。例えば以下の通りである。 (Other embodiments)
The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the present invention. For example:
　上記実施形態では、蒸気配管２２内の蒸気の温度が蒸気配管１２内の蒸気の温度、合流蒸気の温度、および蒸気タービン４０の車室の温度に基づき決定される許容温度範囲にない場合に、蒸気弁２４を閉状態に維持すると共にバイパス弁２７を開状態に維持するように構成した。しかし、これに限定されるものではなく、蒸気配管２２内の蒸気の温度が蒸気配管１２内の蒸気の温度から決定される許容温度範囲にない場合に、蒸気弁２４を閉状態に維持すると共にバイパス弁２７を開状態に維持するように構成してもよい。 In the above embodiment, when the temperature of the steam in the steam pipe 22 is not within the allowable temperature range determined based on the temperature of the steam in the steam pipe 12, the temperature of the combined steam, and the temperature of the cabin of the steam turbine 40, The steam valve 24 is kept closed and the bypass valve 27 is kept open. However, the present invention is not limited to this. When the temperature of the steam in the steam pipe 22 is not within the allowable temperature range determined from the temperature of the steam in the steam pipe 12, the steam valve 24 is kept closed and The bypass valve 27 may be configured to be kept open.
　また、上記実施形態では、第２の排熱回収ボイラとして、１つの排熱回収ボイラ２１を設けるように構成したが、これに限定されるものではなく、２つ以上の他の排熱回収ボイラを設けてこれらの繋ぎ込み操作を行うように構成してもよい。 In the above embodiment, one exhaust heat recovery boiler 21 is provided as the second exhaust heat recovery boiler. However, the present invention is not limited to this, and two or more other exhaust heat recovery boilers are provided. May be provided to perform these connecting operations.
　さらに、上記実施形態では、蒸気弁１４，２４として、蒸気配管１２，２２を開放および閉鎖し得る開閉弁を採用することとしたが、これに限定されるものではなく、蒸気配管１２，２２内の蒸気の量を制御する流量制御弁を採用してもよい。 Furthermore, in the above embodiment, the steam valves 14 and 24 employ the on-off valves that can open and close the steam pipes 12 and 22. However, the present invention is not limited to this. A flow control valve for controlling the amount of steam may be employed.
　さらに、上記実施形態では、蒸気配管２２の下流端を蒸気配管１２の蒸気弁１４よりも下流側の部分に直接接続したが、これに限らず、蒸気ヘッダを介して接続してもよい。 Further, in the above embodiment, the downstream end of the steam pipe 22 is directly connected to a portion of the steam pipe 12 downstream of the steam valve 14, but the present invention is not limited to this, and the steam pipe 22 may be connected via a steam header.
　１　コンバインドサイクル発電プラント
　１１　排熱回収ボイラ（第１の排熱回収ボイラ）
　１２　蒸気配管（第１の蒸気配管）
　１４　蒸気弁（第１の蒸気弁）
　１５　温度センサ（合流温度センサ）
　１６　バイパス配管（第１のバイパス配管）
　１７　バイパス弁（第１のバイパス弁）
　１８　温度センサ（第１の温度センサ）
　２１　排熱回収ボイラ（第２の排熱回収ボイラ）
　２２　蒸気配管（第２の蒸気配管）
　２４　蒸気弁（第２の蒸気弁）
　２６　バイパス配管（第２のバイパス配管）
　２７　バイパス弁（第２のバイパス弁）
　２８　温度センサ（第２の温度センサ）
　４０　蒸気タービン
　４１　復水器
　５０　制御装置
  1 combined cycle power plant 11 waste heat recovery boiler (first waste heat recovery boiler)
12. Steam piping (first steam piping)
14. Steam valve (first steam valve)
15 Temperature sensor (merging temperature sensor)
16 Bypass piping (first bypass piping)
17 Bypass valve (first bypass valve)
18. Temperature sensor (first temperature sensor)
21 Waste heat recovery boiler (second waste heat recovery boiler)
22 Steam piping (second steam piping)
24 Steam valve (second steam valve)
26 Bypass piping (second bypass piping)
27 Bypass valve (second bypass valve)
28 temperature sensor (second temperature sensor)
40 steam turbine 41 condenser 50 controller

Claims (2)

  1. 　排ガスから熱を回収して蒸気を生成する第１の排熱回収ボイラと、
    　排ガスから熱を回収して蒸気を生成する第２の排熱回収ボイラと、
    　前記蒸気によって駆動される蒸気タービンと、
    　前記蒸気タービンから排出された蒸気を凝縮する復水器と、
    　前記第１の排熱回収ボイラと前記蒸気タービンとを接続する第１の蒸気配管と、
    　上流端が前記第２の排熱回収ボイラに接続され、下流端が前記第１の蒸気配管に接続された第２の蒸気配管と、
    　前記第１の蒸気配管に設けられた第１の蒸気弁と、
    　前記第２の蒸気配管に設けられた第２の蒸気弁と、
    　前記第１の蒸気配管の前記第１の蒸気弁の上流側に位置する分岐点から分岐され、下流端が前記復水器に接続された第１のバイパス配管と、
    　前記第１のバイパス配管に設けられた第１のバイパス弁と、
    　前記第２の蒸気配管の前記第２の蒸気弁の上流側に位置する分岐点から分岐され、下流端が前記復水器に接続された第２のバイパス配管と、
    　前記第２のバイパス配管に設けられた第２のバイパス弁と、
    　前記第２の蒸気配管内の蒸気の温度が前記第１の蒸気配管内の蒸気の温度から決定される許容温度範囲にない場合に、前記第２の蒸気弁を閉状態にすると共に前記第２のバイパス弁を開状態にし、前記第２の蒸気配管内の蒸気の温度が前記許容温度範囲にある場合に、前記第２の蒸気弁を開状態にすると共に前記第２のバイパス弁を閉状態にする制御装置と、を備えている、コンバインドサイクル発電プラント。     A first exhaust heat recovery boiler that recovers heat from exhaust gas to generate steam;
    A second exhaust heat recovery boiler that recovers heat from the exhaust gas to generate steam;
    A steam turbine driven by the steam;
    A condenser for condensing the steam discharged from the steam turbine,
    A first steam pipe connecting the first exhaust heat recovery boiler and the steam turbine,
    A second steam pipe having an upstream end connected to the second exhaust heat recovery boiler and a downstream end connected to the first steam pipe;
    A first steam valve provided in the first steam pipe;
    A second steam valve provided in the second steam pipe,
    A first bypass pipe branched from a branch point located upstream of the first steam valve of the first steam pipe, and a downstream end connected to the condenser;
    A first bypass valve provided in the first bypass pipe;
    A second bypass pipe branched from a branch point located on the upstream side of the second steam valve of the second steam pipe and having a downstream end connected to the condenser;
    A second bypass valve provided in the second bypass pipe;
    When the temperature of the steam in the second steam pipe is not within an allowable temperature range determined from the temperature of the steam in the first steam pipe, the second steam valve is closed and the second steam valve is closed. Is opened, and when the temperature of the steam in the second steam pipe is within the allowable temperature range, the second steam valve is opened and the second bypass valve is closed. A combined cycle power plant.
  2. 　前記第１の蒸気配管において前記分岐点の上流側の位置に設けられ、前記第１の蒸気配管内の蒸気の温度を検出する第１の温度センサと、
    　前記第２の蒸気配管において前記分岐点の上流側の位置に設けられ、前記第２の蒸気配管内の蒸気の温度を検出する第２の温度センサと、
    　前記第１の蒸気配管において前記合流の位置よりも下流側に設けられ、前記第１の蒸気配管内の蒸気の温度を検出する合流温度センサとをさらに備え、
    　前記制御装置は、前記第１の温度センサにより検出された温度および前記合流温度センサにより検出された温度に基づき前記許容温度範囲を決定するように構成されている、請求項１に記載のコンバインドサイクル発電プラント。     A first temperature sensor that is provided at a position on the upstream side of the branch point in the first steam pipe and detects a temperature of steam in the first steam pipe;
    A second temperature sensor that is provided at a position on the upstream side of the branch point in the second steam pipe and detects a temperature of steam in the second steam pipe;
    A merging temperature sensor that is provided downstream of the merging position in the first steam pipe and detects a temperature of steam in the first steam pipe;
    The combined cycle according to claim 1, wherein the control device is configured to determine the allowable temperature range based on a temperature detected by the first temperature sensor and a temperature detected by the merged temperature sensor. Power plant.
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