WO2022191189A1 - コンバインドサイクルプラントにおける蒸気系統のクリーニング方法 - Google Patents
コンバインドサイクルプラントにおける蒸気系統のクリーニング方法 Download PDFInfo
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- WO2022191189A1 WO2022191189A1 PCT/JP2022/010016 JP2022010016W WO2022191189A1 WO 2022191189 A1 WO2022191189 A1 WO 2022191189A1 JP 2022010016 W JP2022010016 W JP 2022010016W WO 2022191189 A1 WO2022191189 A1 WO 2022191189A1
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- Prior art keywords
- steam
- load
- foreign matter
- cleaning
- gas turbine
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 169
- 238000004140 cleaning Methods 0.000 title claims abstract description 105
- 238000007664 blowing Methods 0.000 claims abstract description 122
- 238000012545 processing Methods 0.000 claims abstract description 96
- 238000011084 recovery Methods 0.000 claims abstract description 73
- 238000012360 testing method Methods 0.000 claims description 130
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 57
- 239000000446 fuel Substances 0.000 claims description 48
- 239000007789 gas Substances 0.000 abstract description 115
- 238000009825 accumulation Methods 0.000 abstract description 14
- 239000002918 waste heat Substances 0.000 abstract description 3
- 238000010276 construction Methods 0.000 description 11
- 239000000567 combustion gas Substances 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000012217 deletion Methods 0.000 description 1
- 230000037430 deletion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/12—Final actuators arranged in stator parts
- F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
- F01D17/141—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path
- F01D17/145—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path by means of valves, e.g. for steam turbines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/002—Cleaning of turbomachines
-
- 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
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
-
- 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
- F01K9/02—Arrangements or modifications of condensate or air pumps
-
- 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
- F02C9/00—Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants
- F02C9/16—Control of working fluid flow
- F02C9/18—Control of working fluid flow by bleeding, bypassing or acting on variable working fluid interconnections between turbines or compressors or their stages
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2220/00—Application
- F05D2220/70—Application in combination with
- F05D2220/72—Application in combination with a steam turbine
- F05D2220/722—Application in combination with a steam turbine as part of an integrated gasification combined cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2230/00—Manufacture
- F05D2230/72—Maintenance
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- 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 disclosure relates to a method for cleaning a steam system in a combined cycle plant.
- This application claims priority based on Japanese Patent Application No. 2021-040565 filed in Japan on March 12, 2021, the contents of which are incorporated herein.
- a combined cycle plant consists of a gas turbine, a heat recovery steam generator that uses the heat of the exhaust gas from the gas turbine to generate steam, a steam turbine that is driven by the steam from the heat recovery boiler, and an exhaust gas that is discharged from the steam turbine.
- Condenser that returns steam to water
- various pumps such as condensate pump and feed water pump, main steam line that guides steam generated in the boiler to the steam turbine, and steam stop valve installed in the main steam line , a water line that leads the water in the condenser to the boiler via a condensate pump, a feedwater pump, etc., and a branch from a position on the boiler side of the steam stop valve in the main steam line and connected to the condenser. and a bypass valve provided in the bypass line.
- Patent Document 1 A method for cleaning pipes and the like is disclosed, for example, in Patent Document 1 below.
- Patent Document 1 discloses that a continuous blow method or an intermittent blow method is performed.
- the continuous blow method the steam stop valve is closed, the temporary bypass valve is opened, and the steam from the heat recovery steam generator is led to the condenser through the main steam line, the bypass line, and the like.
- the intermittent blow method the steam stop valve and temporary bypass valve are closed, the steam from the heat recovery steam generator is stored in the main steam line and bypass line, etc., and then the temporary bypass valve is opened to Guide the accumulated steam to the condenser.
- an object of the present disclosure is to provide a cleaning method capable of shortening the period from completion of construction work of a combined cycle plant to venting of steam to a steam turbine.
- This combined cycle plant includes a gas turbine, a heat recovery boiler capable of generating steam using the heat of exhaust gas discharged from the gas turbine, and a steam turbine driven by the steam from the heat recovery boiler.
- a condenser capable of returning the steam discharged from the steam turbine to water
- a condenser pump capable of boosting the water from the condenser
- a main steam line leadable to a turbine capable of stopping steam from flowing into the steam turbine
- a bypass line branched from a position on the side of the heat recovery steam generator and connected to the condenser a bypass valve provided in the bypass line
- a condensate line capable of leading to a pump, and a feed water line capable of leading water pressurized by the condensate pump to the heat recovery steam generator are provided.
- an intermittent operation process and a trial operation process performed after the intermittent process are performed.
- the intermittent operation processing step includes a no-load operation step in which the steam stop valve and the bypass valve are closed, fuel is supplied to the gas turbine, and the gas turbine is operated without load, and during the no-load operation step , using the heat of the exhaust gas from the gas turbine to generate steam in the heat recovery boiler, and in the portion of the main steam line closer to the heat recovery boiler than the steam stop valve and in the bypass line a pressure accumulating step of accumulating steam in a pressure accumulating region which is a portion closer to the heat recovery steam generator than the bypass valve; and after the pressure accumulating step, stopping fuel supply to the gas turbine and opening the bypass valve, an intermittent blow step of causing the steam in the pressure accumulation region to flow into the condenser; and a post-intermittent blow foreign matter removal step of removing foreign matter in the condenser and the condensate line after the intermittent blow step; including.
- the test run processing step includes a test run step of supplying fuel to the gas turbine and performing a test run of the gas turbine with the steam stop valve closed and the bypass valve open; Steam is generated in the heat recovery steam generator using the heat of the exhaust gas from the heat recovery steam generator, and the steam from the heat recovery steam generator is transferred to the condenser a continuous blowing step for flowing into the inside, a post-trial operation foreign matter removal step for removing foreign matter in the condenser and the condensate line after stopping the fuel supply to the gas turbine after the trial operation step; including.
- the steam system is cleaned without temporarily installing pipes, etc., so cleaning costs can be reduced.
- the foreign matters blown off by the steam blow flow into the condenser together with the steam, so pollution around the plant and noise when the steam is released into the atmosphere can be suppressed.
- the continuous blowing process is performed to further clean the steam system, so the steam system can be cleaned efficiently.
- the steam generated during the trial operation of the gas turbine is used to perform a continuous blowing process during the trial operation to clean the steam system. Therefore, in this embodiment, compared to the case where the test operation of the gas turbine and the blowing for cleaning the steam system are performed separately, from the completion of the construction work of the combined cycle plant until the steam is ventilated to the steam turbine. period can be shortened.
- FIG. 1 is a system diagram of a combined cycle plant in one embodiment according to the present disclosure
- FIG. 4 is a flow chart showing the order of execution of a plurality of steps from completion of construction work of the combined cycle plant to execution of overall test operation of the combined cycle plant in one embodiment according to the present disclosure.
- the combined cycle plant of this embodiment includes a gas turbine 10, a gas turbine generator 18, a heat recovery steam generator 20, a steam turbine 25, a steam turbine generator 28, a condenser 30, and a condensate line 31. , a strainer 32, a condensate pump 33, a water supply line 34, a water supply pump 35, a water supply valve 34v, a main steam line 36, a steam stop valve 37, a steam control valve 38, a bypass line 39, A bypass valve 39v is provided.
- the gas turbine 10 includes a compressor 13 that compresses air A, a combustor 14 that combusts fuel F in the air compressed by the compressor 13 to generate combustion gas, a turbine 15 that is driven by the combustion gas, have
- the compressor 13 includes a compressor rotor 13r rotatable around an axis Arg, a compressor casing 13c covering the compressor rotor 13r, an intake air amount adjuster (hereinafter referred to as an IGV (inlet guide vane)) 13i, have The IGV 13i is provided on the intake port side in the compressor casing 13c and can adjust the flow rate of the air A sucked into the compressor casing 13c.
- the turbine 15 has a turbine rotor 15r rotatable around the axis Arg and a turbine casing 15c covering the turbine rotor 15r.
- Gas turbine 10 also has an intermediate casing 12 .
- the intermediate casing 12 is arranged between the compressor casing 13c and the turbine casing 15c in the direction in which the axis Arg extends, and connects the compressor casing 13c and the turbine casing 15c.
- a combustor 14 is provided in this intermediate casing 12 .
- a fuel line 16 is connected to the combustor 14 .
- the fuel line 16 is provided with a fuel control valve 17 for adjusting the flow rate of fuel flowing through the fuel line 16 .
- the compressor rotor 13r and the turbine rotor 15r are positioned on the same axis Arg and connected to each other to form the gas turbine rotor 11.
- a rotor of a gas turbine generator 18 is connected to the gas turbine rotor 11 .
- the gas turbine generator 18 can be electrically connected to the external power system PS via a transformer 19t and a circuit breaker 19b.
- the heat recovery boiler 20 has a water inlet 20i and a steam outlet 20o.
- This exhaust heat recovery boiler 20 converts water, which has flowed in from a water inlet 20i, into steam using the heat of the exhaust gas discharged from the gas turbine 10 . This steam flows out from the steam outlet 20o.
- the steam turbine 25 has a steam turbine rotor 25r rotatable about the axis Ars and a steam turbine casing 25c covering the steam turbine rotor 25r.
- a steam inlet 25i and an exhaust port 25o are formed in the steam turbine casing 25c.
- a rotor of the steam turbine generator 28 is connected to the steam turbine rotor 25r.
- the steam turbine generator 28 can be electrically connected to the external power system PS via a transformer 29t and a circuit breaker 29b.
- the rotor of the gas turbine generator 18 is connected to the gas turbine rotor 11, and the rotor of the steam turbine generator 28 is connected to the steam turbine rotor 25r. That is, the combined cycle plant of this embodiment is a twin shaft combined cycle plant.
- the gas turbine rotor 11 and the steam turbine rotor 25r may be connected, and one generator may be connected to this rotor. That is, the combined cycle plant may be a single shaft combined cycle plant.
- a condenser 30 is connected to the exhaust port 25o of the steam turbine casing 25c. Condenser 30 heat-exchanges steam from steam turbine 25 with cooling medium CM and cools this steam to water.
- One end of a condensate line 31 is connected to the bottom of the condenser 30 .
- the other end of the condensate line 31 is connected to the suction port of the condensate pump 33 .
- a condensate pump 33 can boost the pressure of the water from the condenser 30 .
- the condensate line 31 is provided with a strainer 32 capable of removing foreign matter contained in the water flowing through the condensate line 31 .
- a water supply line 34 is connected to the outlet of the condensate pump 33 .
- the other end of the water supply line 34 is connected to the water inlet 20 i of the heat recovery boiler 20 .
- the water supply line 34 is provided with a water supply pump 35 and a water supply valve 34v.
- a feedwater pump 35 can pressurize the water from the condensate line 31 and send the water to the heat recovery boiler 20 via the feedwater line 34 .
- main steam line 36 is connected to the steam outlet 20o of the heat recovery boiler 20.
- the other end of this main steam line 36 is connected to the steam inlet 25i of the steam turbine casing 25c.
- the main steam line 36 is provided with a steam stop valve 37 and a steam control valve 38 .
- One end of a bypass line 39 is connected to a position in the main steam line 36 closer to the exhaust heat recovery boiler 20 than the steam stop valve 37 and the steam control valve 38 .
- the other end of this bypass line 39 is connected to the condenser 30 .
- the bypass line 39 is provided with a bypass valve 39v.
- the cleaning method for the steam system, etc. is applied to the steam system in the combined cycle plant explained using FIG.
- the steam system here includes the main steam line 36 , the bypass line 39 and the condenser 30 .
- the initial ignition process S10 is executed. After that, the intermittent operation processing step S20 of the gas turbine 10, the trial operation processing step S30 of the gas turbine 10, and the overall trial operation step S50 are sequentially performed.
- the cleaning method of the present embodiment is performed in the intermittent operation processing step S20 of the gas turbine 10 and the trial operation processing step S30 of the gas turbine 10 .
- the initial ignition step S10 fuel is supplied to the combustor 14 to generate combustion gas within the combustor 14 to drive the turbine 15. In this initial ignition step S10, it is confirmed whether fuel combustion in the combustor 14 and driving of the turbine 15 are performed.
- the intermittent operation process S20 of the gas turbine 10 is executed.
- a no-load operation step S21, a pressure accumulation step S22, an intermittent blowing step S23, a foreign matter removing step S24 after intermittent blowing, and a judgment step S25 are executed.
- no-load operation is operation of the gas turbine 10 in a state in which the gas turbine generator 18 is not electrically connected to an external system, that is, in a state in which the circuit breakers 19b and 29b are open.
- the pressure accumulation step S22 is executed during the no-load operation step S21.
- the heat of the exhaust gas from the gas turbine 10 is used to generate steam in the heat recovery steam generator 20.
- the steam is accumulated in the pressure accumulation region, which is the portion on the side of the exhaust heat recovery steam generator 20 from the bypass valve 39v in the partial and bypass line 39 .
- the fuel supply to the gas turbine 10 is stopped, and the no-load operation step S21 and the pressure accumulation step S22 are terminated.
- the water supply valve 34v is closed, and the condensate pump 33 and the water supply pump 35 are stopped.
- the intermittent blowing step S23 is performed after the no-load operation step S21 and the pressure accumulation step S22.
- the bypass valve 39v is opened to allow the steam in the pressure accumulation region to flow into the condenser 30 at once.
- the post-intermittent blow foreign matter removal step S24 is executed after the intermittent blow step S23.
- foreign matter in the condenser 30 and the condensate line 31 is removed. Specifically, for example, a worker enters the condenser 30 and removes foreign matter in the condenser 30 . Furthermore, a worker removes foreign matter accumulated in the strainer 32 provided in the condensate line 31 .
- the determination step S25 is executed after the post-intermittent blow foreign matter removal step S24.
- the operator judges whether or not the condition for ending the intermittent operation process is satisfied.
- the termination condition of the intermittent operation process is, for example, that the number of executions of the intermittent operation process step S20 reaches a predetermined number, or that the amount of foreign matter removed in the post-intermittent blow foreign matter removal step S24 is determined in advance. It is, for example, that it has become less than the specified amount.
- Step S25 is performed. That is, in this embodiment, the intermittent operation processing step S20 may be executed multiple times. In this way, when the intermittent operation processing step S20 is performed a plurality of times, the intermittent blowing step S23 is performed during each intermittent operation processing step S20, so it is possible to increase the efficiency of removing foreign matter in the steam system.
- the trial operation process step S30 of the gas turbine 10 is executed.
- the test run processing step S30 of the gas turbine 10 includes a no-load test run process step S31 and a partial load test run process step S41 that is executed after the no-load test run process step S31.
- the no-load test run processing step S31 includes a no-load test run step S32, a no-load continuous blowing step S33, a post-no-load foreign matter removal step S34, and a determination step S35.
- the no-load test run step S32 fuel is supplied to the gas turbine 10 with the steam stop valve 37 closed and the bypass valve 39v open, and the gas turbine 10 is tested without load.
- the water supply valve 34v is in an open state, and the condensate pump 33 and the water supply pump 35 are driven.
- the trial run is an operation including a process of adjusting the control system of the gas turbine 10 .
- adjustment of the control system means adjustment of, for example, control parameters of the IGV 13i and the fuel control valve 17 based on data obtained from the operation of the gas turbine 10 .
- the control system of the gas turbine 10 is not adjusted in the no-load operation step S21 in the intermittent operation processing step S20. Therefore, the operation of the gas turbine 10 in the no-load operation step S21 is not a trial operation.
- the no-load continuous blowing process S33 is executed during the no-load trial operation process S32.
- the heat of the exhaust gas from the gas turbine 10 is used during the no-load trial operation step S32 to generate steam in the exhaust heat recovery boiler 20, and a portion of the main steam line 36 and Via the bypass line 39 , the steam from the heat recovery boiler 20 is caused to flow into the condenser 30 .
- a part of the main steam line 36 and a part of the foreign matter in the bypass line 39 flow into the condenser 30 together with the steam.
- the fuel supply to the gas turbine 10 is stopped, the water supply valve 34v is closed, the condensate pump 33 and the water supply pump 35 are stopped, and then the post-no-load foreign matter removal step S34 is executed.
- this post-no-load foreign matter removal step S34 foreign matter in the condenser 30 and the condensate line 31 is removed in the same manner as in the post-intermittent blow foreign matter removal step S24.
- the determination step S35 is executed after the post-no-load foreign matter removal step S34.
- the operator judges whether or not the condition for ending the no-load test run process is satisfied.
- the termination condition of the no-load test run process is, for example, completion of adjustment of the control system in the no-load test run process S32, or completion of adjustment of the control system in the no-load test run process S32 and no-load process.
- the amount of foreign matter removed in the post-foreign matter removal step S34 has become equal to or less than a predetermined amount.
- the no-load test run process S32, the no-load continuous blowing process S33, the foreign matter removal process after no-load S34, and the determination process are performed again.
- S35 is executed. That is, in the present embodiment, the no-load test run processing step S31 may be executed multiple times. In this way, when the no-load test run processing step S31 is executed a plurality of times, the no-load continuous blowing step S33 is executed during each no-load test run processing step S31, so the foreign matter removal efficiency in the steam system can be increased. .
- the partial load test run process step S41 of the gas turbine 10 is executed.
- This partial load trial run processing step S41 includes a first load trial run processing step S41a and a second load trial run processing step S41b that is executed after the first load trial run processing step S41a.
- the first load test run processing step S41a includes a first load test run step S42a, a first load continuous blowing step S43a, a foreign matter removal step after first load S44a, and a determination step S45a.
- the first load test run step S42a With the steam stop valve 37 closed and the bypass valve 39v open, fuel is supplied to the gas turbine 10 to test run the gas turbine 10 at the first load.
- the water supply valve 34v is in an open state, and the condensate pump 33 and the water supply pump 35 are driven.
- the first load is, for example, 20% to 40%.
- the first load continuous blowing step S43a is executed during the first load test run step S42a.
- the heat of the exhaust gas from the gas turbine 10 is used to generate steam in the exhaust heat recovery boiler 20 during the first load trial operation step S42a.
- the steam from the heat recovery boiler 20 flows into the condenser 30 via the heat recovery steam generator 20 and the bypass line 39 .
- part of the main steam line 36 and part of the foreign matter in the bypass line 39 flow into the condenser 30 together with the steam.
- the fuel supply to the gas turbine 10 is stopped, the water supply valve 34v is closed, the condensate pump 33 and the water supply pump 35 are stopped, and then the post-first load foreign matter removal step S44a is executed. be.
- this post-first-load foreign matter removal step S44a foreign matter in the condenser 30 and the condensate line 31 is removed in the same manner as in the post-intermittent blow foreign matter removal step S24.
- the determination step S45a is executed after the first post-load foreign matter removal step S44a.
- the worker judges whether or not the load change condition is satisfied.
- the load change condition is, for example, completion of adjustment of the control system in the first load test run step S42a, or completion of adjustment of the control system in the first load test run step S42a and after the first load
- the amount of removed foreign matter in the foreign matter removing step S44a is equal to or less than a predetermined amount.
- the above-described first load test run step S42a, first load continuous blowing step S43a, first load foreign matter removal step S44a, and determination step S45a are repeated. is executed. That is, in the present embodiment, the first load test run processing step S41a may be executed multiple times. In this way, when the first load test run processing step S41a is executed a plurality of times, the first load continuous blowing step S43a is executed during each first load test run processing step S41a, thereby increasing the efficiency of removing foreign matter in the steam system. be able to.
- the second load test run processing step S41b of the gas turbine 10 is executed.
- the second load test run processing step S41b includes a second load test run step S42b, a second load continuous blowing step S43b, a foreign matter removal step after second load S44b, and a determination step S45b.
- the second load test run step S42b fuel is supplied to the gas turbine 10 with the steam stop valve 37 closed and the bypass valve 39v open, and the gas turbine 10 is tested with a second load that is greater than the first load.
- the water supply valve 34v is in an open state, and the condensate pump 33 and the water supply pump 35 are driven.
- the second load is, for example, 45% to 70%.
- the second load continuous blowing step S43b is executed during the second load trial operation step S42b.
- the heat of the exhaust gas from the gas turbine 10 is used to generate steam in the exhaust heat recovery boiler 20 during the second load trial operation process S42b.
- the steam from the heat recovery boiler 20 flows into the condenser 30 via the heat recovery steam generator 20 and the bypass line 39 .
- part of the main steam line 36 and part of the foreign matter in the bypass line 39 flow into the condenser 30 together with the steam.
- the fuel supply to the gas turbine 10 is stopped, the water supply valve 34v is closed, the condensate pump 33 and the water supply pump 35 are stopped, and then the post-second load foreign matter removal step S44b is executed. be.
- this second post-load foreign matter removal step S44b foreign matter in the condenser 30 and the condensate line 31 is removed in the same manner as in the post-intermittent blow foreign matter removal step S24.
- the determination step S45b is executed after the second post-load foreign matter removal step S44b.
- the operator judges whether or not the termination condition of the second load test run process is satisfied.
- the termination condition of the second load test run process is, for example, completion of adjustment of the control system in the second load test run process S42b, or completion of adjustment of the control system in the second load test run process S42b.
- the amount of foreign matter removed in the second post-load foreign matter removing step S44b is equal to or less than a predetermined amount.
- the second load test run step S42b, the second load continuous blowing step S43b, and the foreign matter removal step after the second load are performed again.
- the judgment step S45b is executed. That is, in the present embodiment, the second load test run processing step S41b may be executed multiple times. In this way, when the second load test run processing step S41b is executed a plurality of times, the second load continuous blowing step S43b is executed during each second load test run processing step S41b, thereby increasing the efficiency of removing foreign matter in the steam system. be able to.
- the second load test run process step S41b of the gas turbine 10 ends. Therefore, in this case, the test run processing step S30 of the gas turbine 10 ends.
- the cleaning method according to the present embodiment is completed at the end of the test run processing step S30.
- the overall test run step S50 is executed.
- fuel is supplied to the gas turbine 10 with the steam stop valve 37 closed and the bypass valve 39v open, and the gas turbine 10 is trial run at, for example, a rated load.
- the water supply valve 34v is in an open state, and the condensate pump 33 and the water supply pump 35 are driven.
- steam from the heat recovery steam generator 20 flows into the condenser 30 via the main steam line 36 and the bypass line 39 .
- the no-load test run process S32, the first load test run process S42a, and the second load test run process S42b are part of the test run processes S32, S42a, and S42b in the test run processing process S30, respectively.
- the first load trial run step S42a and the second load trial run step S42b are part of the partial load trial run steps S42a and S42b in the partial load trial run process step S41, respectively.
- the no-load continuous blowing process S33, the first load continuous blowing process S43a, and the second load continuous blowing process S43b are part of the continuous blowing processes S33, S43a, and S43b in the test run treatment process S30, respectively.
- the first load continuous blowing process S43a and the second load continuous blowing process S43b are part of the partial load continuous blowing processes S43a and S43b, respectively.
- the post-no-load foreign matter removal step S34, the first post-load foreign matter removal step S44a, and the second post-load foreign matter removal step S44b are part of the post-trial operation foreign matter removal steps S34, S44a, and S44b in the trial operation processing step S30, respectively.
- the first post-load foreign matter removal step S44a and the second post-load foreign matter removal step S44b are part of the post-partial load foreign matter removal steps S44a and S44b, respectively.
- the steam system is cleaned without temporarily installing piping or the like, so cleaning costs can be reduced.
- the foreign matters blown off by the steam blow flow into the condenser 30 together with the steam, so pollution around the plant and noise when the steam is released into the atmosphere can be suppressed.
- the continuous blowing steps S33, S43a, and S43b are performed to further clean the steam system. can be cleaned.
- the steam generated during the trial operation of the gas turbine 10 is used to perform the continuous blowing steps S33, S43a, and S43b during the trial operation to clean the steam system. Therefore, in the present embodiment, steam is supplied to the steam turbine 25 after the construction work of the combined cycle plant is completed, as compared with the case where the trial operation of the gas turbine 10 and the steam blow for cleaning the steam system are performed separately. can be shortened.
- the dynamic pressure P inside the pipe can be expressed by the following equation (2).
- P ( ⁇ /2g) ⁇ V (2)
- ⁇ is the specific weight of the steam
- g is the gravitational acceleration
- V is the flow velocity.
- the steam flow rate Q can be expressed by the following equation (3).
- Q AV (3)
- A is the cross-sectional area of the pipe.
- the cleaning force in the main steam line 36 during the rated operation of the steam turbine 25 is defined as the rated cleaning force Fn, and the main steam line 36 during blowing in the intermittent blowing step S23 and the continuous blowing steps S33, S43a, and S43b described above.
- the cleaning force in the bypass line 39 is defined as blow cleaning force Fb.
- the operation of the bypass valve 39v is adjusted so that the cleaning force rate R is less than 1. Further, in the present embodiment, in the second load continuous blow step S43b, the operation of the bypass valve 39v is adjusted to set the cleaning force rate R to 1 or more.
- the cleaning force rate R is set to less than 1 in the intermittent blowing step S23, the no-load continuous blowing step S33, and the first load continuous blowing step S43a, and in these steps, To blow off foreign matter relatively easy to blow off, and to easily blow off foreign matter relatively difficult to blow off in a pipe. Then, the cleaning force rate R in the second load continuous blowing step S43b after these steps is set to 1 or more, and the foreign matter that could not be blown off in the previous step is blown off in this second load continuous blowing step S43b. . Therefore, in this embodiment, the steam system can be efficiently cleaned also from this point of view.
- the cleaning force rate R in the intermittent blowing process S23, the no-load continuous blowing process S33, and the first load continuous blowing process S43a may be 1 or more.
- a method for cleaning a steam system in a combined cycle plant according to the first aspect is applied to the following combined cycle plant.
- This combined cycle plant includes a gas turbine 10, an exhaust heat recovery boiler 20 capable of generating steam using the heat of the exhaust gas discharged from the gas turbine 10, and driven by the steam from the exhaust heat recovery boiler 20.
- a main steam line 36 capable of guiding steam generated in the recovery boiler 20 to the steam turbine 25, and a steam stop valve provided in the main steam line 36 and capable of stopping the flow of steam into the steam turbine 25.
- an intermittent operation processing step S20 and a trial operation processing step S30 performed after the intermittent processing step are executed.
- the intermittent operation processing step S20 includes a no-load operation step S21 in which fuel is supplied to the gas turbine 10 and the gas turbine 10 is operated in a no-load state while the steam stop valve 37 and the bypass valve 39v are closed; During the no-load operation step S21, the heat of the exhaust gas from the gas turbine 10 is used to generate steam in the exhaust heat recovery boiler 20, and the exhaust gas is discharged from the steam stop valve 37 in the main steam line 36.
- the trial operation processing step S30 includes trial operation steps S32, S42a, and S42b in which the steam stop valve 37 is closed and the bypass valve 39v is open, fuel is supplied to the gas turbine 10, and the gas turbine 10 is trial run.
- the heat of the exhaust gas from the gas turbine 10 is used to generate steam in the heat recovery steam generator 20, and the part of the main steam line 36 and the bypass
- the trial operation steps S32, S42a, S42b After continuous blowing steps S33, S43a, S43b in which the steam from the heat recovery boiler 20 flows into the condenser 30 through the line 39, and the trial operation steps S32, S42a, S42b,
- foreign matter removal steps S34, S44a, and S44b after trial operation for removing foreign matter in the condenser 30 and the condensate line 31 are included.
- the steam system is cleaned without temporarily installing pipes, etc., so cleaning costs can be reduced.
- the foreign matters blown off by the steam blow flow into the condenser 30 together with the steam, so pollution around the plant and noise when the steam is released into the atmosphere can be suppressed.
- the continuous blowing steps S33, S43a, and S43b are performed to further clean the steam system, so the steam system can be cleaned efficiently. can be done.
- the steam generated during the trial operation of the gas turbine 10 is used to perform the continuous blowing steps S33, S43a, and S43b during the trial operation to clean the steam system. Therefore, in this embodiment, steam is ventilated to the steam turbine 25 after the construction work of the combined cycle plant is completed, rather than when the test operation of the gas turbine 10 and the blowing for cleaning the steam system are performed separately. You can shorten the time until
- the intermittent operation processing step S20 is performed multiple times before the trial operation steps S32, S42a, and S42b.
- the intermittent operation processing step S20 is performed a plurality of times, and the intermittent blowing step S23 is performed during each intermittent operation processing step S20, so the foreign matter removal efficiency in the steam system can be improved.
- the trial run processing step S30 includes a partial load trial run processing step S41.
- the partial load trial operation processing step S41 includes partial load trial operation steps S42a and S42b that are part of the trial operation steps S32, S42a and S42b, and a partial load continuous blow step that is a part of the continuous blow steps S33, S43a and S43b.
- S43a, S43b, and post-partial-load foreign matter removal steps S44a, S44b which are part of the post-test operation foreign matter removal steps S34, S44a, S44b.
- partial load test operation steps S42a and S42b fuel is supplied to the gas turbine 10 with the steam stop valve 37 closed and the bypass valve 39v open, and the gas turbine 10 is subjected to a partial load test operation.
- the heat of the exhaust gas from the gas turbine 10 is used to generate steam in the exhaust heat recovery steam generator 20 during the partial load trial operation steps S42a and S42b. Steam from the heat recovery boiler 20 flows into the condenser 30 via part of the main steam line 36 and the bypass line 39 .
- the fuel supply to the gas turbine 10 is stopped, and then the post-partial load foreign matter removal steps S44a and S44b are executed.
- the post-partial load foreign matter removal steps S44a and S44b foreign matter in the condenser 30 and the condensate line 31 is removed.
- the foreign matter removal efficiency in the steam system can be increased compared to continuous blowing with no load.
- the partial load test run processing step S41 (S41a, S41b) is executed a plurality of times, and the partial load continuous blowing steps S43a, S43b are executed during each partial load test run processing step S41a, 41b. It is possible to increase the efficiency of removing foreign matter.
- the intermittent blow step S23 is applied to the intermittent blow step S23 with respect to the force Fn that blows away foreign matter with steam in the main steam line 36 during the rated operation of the steam turbine 25.
- the cleaning force rate R is the ratio of the force Fb that removes the foreign matter with the steam in the main steam line 36 and the bypass line 39 during the blowing in the continuous blowing steps S33, S43a, and S43b
- the cleaning force rate R is the above-mentioned
- the operation of the bypass valve 39v is adjusted to reduce the cleaning force rate R to 1. Do more.
- the foreign matter that is relatively easy to blow off in the steam system is blown off, and the steam is blown off.
- the cleaning force rate in the partial load continuous blowing step S43b after this blowing step is set to 1 or more, and the foreign matter that could not be blown off in the previous blowing step is blown off in this partial load continuous blowing step S43b. Therefore, in this aspect, the steam system can be cleaned efficiently.
- the trial run processing step S30 includes a partial load trial run processing step S41.
- the partial load test run processing step S41 includes a first load test run processing step S41a and a second load test run processing step S41b that is executed after the first load test run processing.
- the first load trial run processing step S41a includes a first load trial run step S42a that is part of the trial run steps S32, S42a, and S42b, and a first load continuous blow process that is part of the continuous blow steps S33, S43a, and S43b.
- step S43a It includes a step S43a and a first post-load foreign matter removal step S44a which is part of the post-test operation foreign matter removal steps S34, S44a, and S44b.
- the steam stop valve 37 is closed and the bypass valve 39v is open, fuel is supplied to the gas turbine 10, and the gas turbine 10 is operated under a first load smaller than the rated load. to test drive.
- the first load continuous blowing step S43a the heat of the exhaust gas from the gas turbine 10 is utilized during the first load trial operation step S42a to generate steam in the exhaust heat recovery boiler 20, and the main steam is generated.
- the second load trial run processing step S41b includes a second load trial run step S42b that is part of the trial run steps S32, S42a, and S42b, and a second load continuous blow process that is part of the continuous blow steps S33, S43a, and S43b.
- step S43b It includes a step S43b and a second post-load foreign matter removal step S44b which is a part of the post-test operation foreign matter removal steps S34, S44a, and S44b.
- the steam stop valve 37 is closed and the bypass valve 39v is open, fuel is supplied to the gas turbine 10, and the gas turbine 10 is set to a load greater than the first load and Test run with a second load smaller than the rated load.
- the second load continuous blowing step S43b the heat of the exhaust gas from the gas turbine 10 is used to generate steam in the exhaust heat recovery boiler 20 during the second load trial operation step S42b, and the main steam is generated.
- the partial load test operation processing steps S42a and S42b are executed a plurality of times, and the partial load continuous blowing steps S43a and S43b are executed during each partial load test operation step S42a and S42b.
- the intermittent blow step S23 is applied to the intermittent blow step S23 with respect to the force Fn that blows away foreign matter with steam in the main steam line 36 during the rated operation of the steam turbine 25.
- the cleaning force rate R is the ratio of the force Fb that removes the foreign matter with the steam in the main steam line 36 and the bypass line 39 during blowing in the continuous blowing steps S33, S43a, and S43b
- the second load continuous In the blowing step S43b the operation of the bypass valve 39v is adjusted to set the cleaning force rate R to 1 or more.
- the cleaning force rate R in the second load continuous blowing step S43b after this blowing step is set to 1 or more, and foreign matter that could not be blown off in the previous blowing step is blown off in this partial load continuous blowing step S43b. . Therefore, in this aspect, the steam system can be cleaned efficiently.
- the method for cleaning a steam system in a combined cycle plant in the tenth aspect includes:
- the trial run processing step S30 is a no-load trial run processing executed before the partial load trial run processing step S41. including step S31.
- the no-load trial run processing step S31 includes a no-load trial run step S32 that is part of the trial run steps S32, S42a, and S42b, and a no-load continuous blow step S33 that is part of the continuous blow steps S33, S43a, and S43b. and a post-no-load foreign matter removal step S34, which is a part of the post-test operation foreign matter removal step.
- the no-load test operation step S32 fuel is supplied to the gas turbine 10 with the steam stop valve 37 closed and the bypass valve 39v open, and the gas turbine 10 is subjected to a no-load test operation.
- the no-load continuous blowing step S33 the heat of the exhaust gas from the gas turbine 10 is used during the no-load trial operation step S32 to generate steam in the exhaust heat recovery boiler 20, and the main steam line 36 is and the bypass line 39 , the steam from the heat recovery steam generator 20 flows into the condenser 30 .
- the fuel supply to the gas turbine 10 is stopped, and then the post-no-load foreign matter removal step S34 is executed.
- the post-no-load foreign matter removal step S34 foreign matter in the condenser 30 and the condensate line 31 is removed.
- the continuous blowing step S33 is also executed in the no-load test operation processing step S31 that is executed before the partial load test operation processing step S41, the foreign matter removal efficiency in the steam system can be increased.
- the no-load test operation processing step S31 is executed multiple times, and the no-load continuous blowing step S33 is executed during each no-load test operation step S31, so the efficiency of removing foreign matter in the steam system can be increased.
- the method for cleaning a steam system in a combined cycle plant in the twelfth aspect includes: In the method for cleaning a steam system in a combined cycle plant according to the tenth aspect or the eleventh aspect, the force Fn blowing off foreign matter with steam in the main steam line 36 during rated operation of the steam turbine 25 , when the cleaning force rate R is the ratio of the force Fb that removes foreign matter with the steam in the main steam line 36 and the bypass line 39 during blowing in the continuous blowing steps S33, S43a, and S43b, the no-load continuous blowing In step S33, the operation of the bypass valve 39v is adjusted so that the cleaning force rate R is less than one.
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Abstract
Description
本願は、2021年3月12日に、日本国に出願された特願2021-040565号に基づき優先権を主張し、この内容をここに援用する。
このコンバインドサイクルプラントは、ガスタービンと、前記ガスタービンから排気された排気ガスの熱を利用して蒸気を発生可能な排熱回収ボイラと、前記排熱回収ボイラからの蒸気で駆動可能な蒸気タービンと、前記蒸気タービンから排気された蒸気を水に戻すことができる復水器と、前記復水器からの水を昇圧可能な復水ポンプと、前記排熱回収ボイラで発生した蒸気を前記蒸気タービンに導くことができる主蒸気ラインと、前記主蒸気ラインに設けられ、前記蒸気タービンへの蒸気の流入を止めることが可能な蒸気止め弁と、前記主蒸気ライン中で前記蒸気止め弁よりも前記排熱回収ボイラの側の位置から分岐して、前記復水器に接続されているバイパスラインと、前記バイパスラインに設けられているバイパス弁と、前記復水器内の水を前記復水ポンプに導くことができる復水ラインと、前記復水ポンプで昇圧された水を前記排熱回収ボイラに導くことができる給水ラインと、を備える。
クリーニング方法では、間欠運転処理工程と、前記間欠処理工程後に行う試運転処理工程と、を実行する。
前記間欠運転処理工程は、前記蒸気止め弁及び前記バイパス弁が閉状態で、前記ガスタービンに燃料を供給し、前記ガスタービンを無負荷運転する無負荷運転工程と、前記無負荷運転工程中に、前記ガスタービンからの排気ガスの熱を利用して、前記排熱回収ボイラで蒸気を発生させ、前記主蒸気ライン中で前記蒸気止め弁よりも排熱回収ボイラ側の部分及び前記バイパスライン中で前記バイパス弁よりも前記排熱回収ボイラの側の部分である蓄圧領域に蒸気を溜める蓄圧工程と、前記蓄圧工程後に、前記ガスタービンへの燃料供給を停止し、前記バイパス弁を開けて、前記蓄圧領域内の蒸気を前記復水器内に流入させる間欠ブロー工程と、前記間欠ブロー工程後に、前記復水器内及び前記復水ライン内の異物を除去する間欠ブロー後異物除去工程と、を含む。
前記試運転処理工程は、前記蒸気止め弁が閉状態で前記バイパス弁が開状態で、前記ガスタービンに燃料を供給し、前記ガスタービンを試運転する試運転工程と、前記試運転工程中に、前記ガスタービンからの排気ガスの熱を利用して、前記排熱回収ボイラで蒸気を発生させ、前記主蒸気ラインの一部及び前記バイパスラインを介して、前記排熱回収ボイラからの蒸気を前記復水器内に流入させる連続ブロー工程と、前記試運転工程後に、前記ガスタービンへの燃料供給を停止してから、前記復水器内及び前記復水ライン内の異物を除去する試運転後異物除去工程と、を含む。
本実施形態のコンバインドサイクルプラントについて、図1を参照して説明する。
燃焼器14は、この中間ケーシング12に設けられている。燃焼器14には、燃料ライン16が接続されている。この燃料ライン16には、燃料ライン16を流れる燃料の流量を調節する燃料調節弁17が設けられている。
本実施形態のコンバインドサイクルプラントにおける蒸気系統のクリーニング方法について、図2に示すフローチャートに従って説明する。
F=P×Q (1)
P=(γ/2g)×V (2)
なお、γは蒸気の比重量、gは重力加速度、Vは流速である。
Q=A・V (3)
なお、Aは配管の断面積である。
F=P×Q
=((γ/2g)×V)×A・V
=(γ/2g)×A・V2 (4)
以上の実施形態におけるコンバインドサイクルプラントにおける蒸気系統のクリーニング方法は、例えば、以下のように把握される。
このコンバインドサイクルプラントは、ガスタービン10と、前記ガスタービン10から排気された排気ガスの熱を利用して蒸気を発生可能な排熱回収ボイラ20と、前記排熱回収ボイラ20からの蒸気で駆動可能な蒸気タービン25と、前記蒸気タービン25から排気された蒸気を水に戻すことができる復水器30と、前記復水器30からの水を昇圧可能な復水ポンプ33と、前記排熱回収ボイラ20で発生した蒸気を前記蒸気タービン25に導くことができる主蒸気ライン36と、前記主蒸気ライン36に設けられ、前記蒸気タービン25への蒸気の流入を止めることが可能な蒸気止め弁37と、前記主蒸気ライン36中で前記蒸気止め弁37よりも前記排熱回収ボイラ20の側の位置から分岐して、前記復水器30に接続されているバイパスライン39と、前記バイパスライン39に設けられているバイパス弁39vと、前記復水器30内の水を前記復水ポンプ33に導くことができる復水ライン31と、前記復水ポンプ33で昇圧された水を前記排熱回収ボイラ20に導くことができる給水ライン34と、を備える。
クリーニング方法では、間欠運転処理工程S20と、前記間欠処理工程後に行う試運転処理工程S30と、を実行する。
前記間欠運転処理工程S20は、前記蒸気止め弁37及び前記バイパス弁39vが閉状態で、前記ガスタービン10に燃料を供給し、前記ガスタービン10を無負荷運転する無負荷運転工程S21と、前記無負荷運転工程S21中に、前記ガスタービン10からの排気ガスの熱を利用して、前記排熱回収ボイラ20で蒸気を発生させ、前記主蒸気ライン36中で前記蒸気止め弁37よりも排熱回収ボイラ20側の部分及び前記バイパスライン39中で前記バイパス弁39vよりも前記排熱回収ボイラ20の側の部分である蓄圧領域に蒸気を溜める蓄圧工程S22と、前記蓄圧工程S22後に、前記ガスタービン10への燃料供給を停止し、前記バイパス弁39vを開けて、前記蓄圧領域内の蒸気を前記復水器30内に流入させる間欠ブロー工程S23と、前記間欠ブロー工程S23後に、前記復水器30内及び前記復水ライン31内の異物を除去する間欠ブロー後異物除去工程S24と、を含む。
前記試運転処理工程S30は、前記蒸気止め弁37が閉状態で前記バイパス弁39vが開状態で、前記ガスタービン10に燃料を供給し、前記ガスタービン10を試運転する試運転工程S32,S42a,S42bと、前記試運転工程S32,S42a,S42b中に、前記ガスタービン10からの排気ガスの熱を利用して、前記排熱回収ボイラ20で蒸気を発生させ、前記主蒸気ライン36の一部及び前記バイパスライン39を介して、前記排熱回収ボイラ20からの蒸気を前記復水器30内に流入させる連続ブロー工程S33,S43a,S43bと、前記試運転工程S32,S42a,S42b後に、前記ガスタービン10への燃料供給を停止してから、前記復水器30内及び前記復水ライン31内の異物を除去する試運転後異物除去工程S34,S44a,S44bと、を含む。
前記第一態様におけるコンバインドサイクルプラントにおける蒸気系統のクリーニング方法において、前記間欠運転処理工程S20を前記試運転工程S32,S42a,S42b前に複数回実行する。
前記第一態様又は前記第二態様におけるコンバインドサイクルプラントにおける蒸気系統のクリーニング方法において、前記試運転処理工程S30は、部分負荷試運転処理工程S41を含む。前記部分負荷試運転処理工程S41は、前記試運転工程S32,S42a,S42bの一部である部分負荷試運転工程S42a,S42bと、前記連続ブロー工程S33,S43a,S43bの一部である部分負荷連続ブロー工程S43a,S43bと、前記試運転後異物除去工程S34,S44a,S44bの一部である部分負荷後異物除去工程S44a,S44bと、を含む。前記部分負荷試運転工程S42a,S42bでは、前記蒸気止め弁37が閉状態で前記バイパス弁39vが開状態で、前記ガスタービン10に燃料を供給し、前記ガスタービン10を部分負荷試運転する。前記部分負荷連続ブロー工程S43a,S43bでは、前記部分負荷試運転工程S42a,S42b中に、前記ガスタービン10からの排気ガスの熱を利用して、前記排熱回収ボイラ20で蒸気を発生させ、前記主蒸気ライン36の一部及び前記バイパスライン39を介して、前記排熱回収ボイラ20からの蒸気を前記復水器30内に流入させる。前記部分負荷試運転工程S42a,S42b後に、前記ガスタービン10への燃料供給を停止してから、前記部分負荷後異物除去工程S44a,S44bを実行する。前記部分負荷後異物除去工程S44a,S44bでは、前記復水器30内及び前記復水ライン31内の異物を除去する。
前記第三態様におけるコンバインドサイクルプラントにおける蒸気系統のクリーニング方法において、前記部分負荷試運転処理工程41(S41a,S41b)を複数回実行する。
前記第四態様におけるコンバインドサイクルプラントにおける蒸気系統のクリーニング方法において、前記蒸気タービン25の定格運転時における前記主蒸気ライン36内での蒸気により異物を吹き払う力Fnに対して、前記間欠ブロー工程S23及び前記連続ブロー工程S33,S43a,S43bにおけるブロー中における前記主蒸気ライン36及び前記バイパスライン39内での蒸気により異物を払う力Fbの比をクリーニングフォース率Rとした場合、複数回実行する前記部分負荷試運転処理工程S41のうち、少なくとも、最後に実行する部分負荷試運転処理工程41中の前記部分負荷連続ブロー工程S43bでは、前記バイパス弁39vの動作を調節して、前記クリーニングフォース率Rを1以上にする。
前記第五態様におけるコンバインドサイクルプラントにおける蒸気系統のクリーニング方法において、前記間欠ブロー工程S23では、前記バイパス弁39vの動作を調節して、前記クリーニングフォース率Rを1未満にする。
前記第一態様又は前記第二態様におけるコンバインドサイクルプラントにおける蒸気系統のクリーニング方法において、前記試運転処理工程S30は、部分負荷試運転処理工程S41を含む。前記部分負荷試運転処理工程S41は、第一負荷試運転処理工程S41aと、前記第一負荷試運転処理後に実行する第二負荷試運転処理工程S41bを含む。前記第一負荷試運転処理工程S41aは、前記試運転工程S32,S42a,S42bの一部である第一負荷試運転工程S42aと、前記連続ブロー工程S33,S43a,S43bの一部である第一負荷連続ブロー工程S43aと、前記試運転後異物除去工程S34、S44a,S44bの一部である第一負荷後異物除去工程S44aと、を含む。前記第一負荷試運転工程S42aでは、前記蒸気止め弁37が閉状態で前記バイパス弁39vが開状態で、前記ガスタービン10に燃料を供給し、前記ガスタービン10を定格負荷よりも小さい第一負荷で試運転する。前記第一負荷連続ブロー工程S43aでは、前記第一負荷試運転工程S42a中に、前記ガスタービン10からの排気ガスの熱を利用して、前記排熱回収ボイラ20で蒸気を発生させ、前記主蒸気ライン36の一部及び前記バイパスライン39を介して、前記排熱回収ボイラ20からの蒸気を前記復水器30内に流入させる。前記第一負荷試運転工程S42a後に、前記ガスタービン10への燃料供給を停止してから、前記第一負荷後異物除去工程S44aを実行する。前記第一負荷後異物除去工程S44aでは、前記復水器30内及び前記復水ライン31内の異物を除去する。前記第二負荷試運転処理工程S41bは、前記試運転工程S32,S42a,S42bの一部である第二負荷試運転工程S42bと、前記連続ブロー工程S33,S43a,S43bの一部である第二負荷連続ブロー工程S43bと、前記試運転後異物除去工程S34、S44a,S44bの一部である第二負荷後異物除去工程S44bと、を含む。前記第二負荷試運転工程S42bでは、前記蒸気止め弁37が閉状態で前記バイパス弁39vが開状態で、前記ガスタービン10に燃料を供給し、前記ガスタービン10を前記第一負荷よりも大きく且つ前記定格負荷よりも小さな第二負荷で試運転する。前記第二負荷連続ブロー工程S43bでは、前記第二負荷試運転工程S42b中に、前記ガスタービン10からの排気ガスの熱を利用して、前記排熱回収ボイラ20で蒸気を発生させ、前記主蒸気ライン36の一部及び前記バイパスライン39を介して、前記排熱回収ボイラ20からの蒸気を前記復水器30内に流入させる。前記第二負荷試運転工程S42b後に、前記ガスタービン10への燃料供給を停止してから、前記第二負荷後異物除去工程S44bを実行する。前記第二負荷後異物除去工程S44bでは、前記復水器30内及び前記復水ライン31内の異物を除去する。
前記第七態様におけるコンバインドサイクルプラントにおける蒸気系統のクリーニング方法において、前記蒸気タービン25の定格運転時における前記主蒸気ライン36内での蒸気により異物を吹き払う力Fnに対して、前記間欠ブロー工程S23及び前記連続ブロー工程S33,S43a,S43bにおけるブロー中における前記主蒸気ライン36及び前記バイパスライン39内での蒸気により異物を払う力Fbの比をクリーニングフォース率Rとした場合、前記第二負荷連続ブロー工程S43bでは、前記バイパス弁39vの動作を調節して、前記クリーニングフォース率Rを1以上にする。
前記第八態様におけるコンバインドサイクルプラントにおける蒸気系統のクリーニング方法において、前記間欠ブロー工程S23、及び前記第一負荷連続ブロー工程S43aでは、前記バイパス弁39vの動作を調節して、前記クリーニングフォース率Rを1未満にする。
前記第三態様から前記第九態様のうちのいずれか一態様におけるコンバインドサイクルプラントにおける蒸気系統のクリーニング方法において、前記試運転処理工程S30は、前記部分負荷試運転処理工程S41前に実行する無負荷試運転処理工程S31を含む。前記無負荷試運転処理工程S31は、前記試運転工程S32,S42a,S42bの一部である無負荷試運転工程S32と、前記連続ブロー工程S33,S43a,S43bの一部である無負荷連続ブロー工程S33と、前記試運転後異物除去工程の一部であるの無負荷後異物除去工程S34と、を含む。前記無負荷試運転工程S32では、前記蒸気止め弁37が閉状態で前記バイパス弁39vが開状態で、前記ガスタービン10に燃料を供給し、前記ガスタービン10を無負荷試運転する。前記無負荷連続ブロー工程S33では、前記無負荷試運転工程S32中に、前記ガスタービン10からの排気ガスの熱を利用して、前記排熱回収ボイラ20で蒸気を発生させ、前記主蒸気ライン36の一部及び前記バイパスライン39を介して、前記排熱回収ボイラ20からの蒸気を前記復水器30内に流入させる。前記無負荷試運転工程S32後に、前記ガスタービン10への燃料供給を停止してから、前記無負荷後異物除去工程S34を実行する。前記無負荷後異物除去工程S34では、前記復水器30内及び前記復水ライン31内の異物を除去する。
前記第十態様におけるコンバインドサイクルプラントにおける蒸気系統のクリーニング方法において、前記無負荷試運転処理工程S31を複数回実行する。
前記第十態様又は前記第十一態様におけるコンバインドサイクルプラントにおける蒸気系統のクリーニング方法において、前記蒸気タービン25の定格運転時における前記主蒸気ライン36内での蒸気により異物を吹き払う力Fnに対して、前記連続ブロー工程S33,S43a,S43bにおけるブロー中における前記主蒸気ライン36及び前記バイパスライン39内での蒸気により異物を払う力Fbの比をクリーニングフォース率Rとした場合、前記無負荷連続ブロー工程S33では、前記バイパス弁39vの動作を調節して、前記クリーニングフォース率Rを1未満にする。
11:ガスタービンロータ
12:中間ケーシング
13:圧縮機
13r:圧縮機ロータ
13c:圧縮機ケーシング
13i:吸気量調節機(IGV)
14:燃焼器
15:タービン
15r:タービンロータ
15c:タービンケーシング
16:燃料ライン
17:燃料調節弁
18:ガスタービン発電機
19t:変圧器
19b:遮断器
20:排熱回収ボイラ
20i:水入口
20o:蒸気出口
25:蒸気タービン
25r:蒸気タービンロータ
25c:蒸気タービンケーシング
25i:蒸気入口
25o:排気口
28:蒸気タービン発電機
29t:変圧器
29b:遮断器
30:復水器
31:復水ライン
32:ストレーナ
33:復水ポンプ
34:給水ライン
34v:給水弁
35:給水ポンプ
36:主蒸気ライン
37:蒸気止め弁
38:蒸気加減弁
39:バイパスライン
39v:バイパス弁
Arg,Ars:軸線
PS:外部電力系統
Claims (12)
- ガスタービンと、
前記ガスタービンから排気された排気ガスの熱を利用して蒸気を発生可能な排熱回収ボイラと、
前記排熱回収ボイラからの蒸気で駆動可能な蒸気タービンと、
前記蒸気タービンから排気された蒸気を水に戻すことができる復水器と、
前記復水器からの水を昇圧可能な復水ポンプと、
前記排熱回収ボイラで発生した蒸気を前記蒸気タービンに導くことができる主蒸気ラインと、
前記主蒸気ラインに設けられ、前記蒸気タービンへの蒸気の流入を止めることが可能な蒸気止め弁と、
前記主蒸気ライン中で前記蒸気止め弁よりも前記排熱回収ボイラの側の位置から分岐して、前記復水器に接続されているバイパスラインと、
前記バイパスラインに設けられているバイパス弁と、
前記復水器内の水を前記復水ポンプに導くことができる復水ラインと、
前記復水ポンプで昇圧された水を前記排熱回収ボイラに導くことができる給水ラインと、
を備えるコンバインドサイクルプラントにおける蒸気系統のクリーニング方法において、
間欠運転処理工程と、前記間欠処理工程後に行う試運転処理工程と、を実行し、
前記間欠運転処理工程は、
前記蒸気止め弁及び前記バイパス弁が閉状態で、前記ガスタービンに燃料を供給し、前記ガスタービンを無負荷運転する無負荷運転工程と、
前記無負荷運転工程中に、前記ガスタービンからの排気ガスの熱を利用して、前記排熱回収ボイラで蒸気を発生させ、前記主蒸気ライン中で前記蒸気止め弁よりも排熱回収ボイラ側の部分及び前記バイパスライン中で前記バイパス弁よりも前記排熱回収ボイラの側の部分である蓄圧領域に蒸気を溜める蓄圧工程と、
前記蓄圧工程後に、前記ガスタービンへの燃料供給を停止し、前記バイパス弁を開けて、前記蓄圧領域内の蒸気を前記復水器内に流入させる間欠ブロー工程と、
前記間欠ブロー工程後に、前記復水器内及び前記復水ライン内の異物を除去する間欠ブロー後異物除去工程と、
を含み、
前記試運転処理工程は、
前記蒸気止め弁が閉状態で前記バイパス弁が開状態で、前記ガスタービンに燃料を供給し、前記ガスタービンを試運転する試運転工程と、
前記試運転工程中に、前記ガスタービンからの排気ガスの熱を利用して、前記排熱回収ボイラで蒸気を発生させ、前記主蒸気ラインの一部及び前記バイパスラインを介して、前記排熱回収ボイラからの蒸気を前記復水器内に流入させる連続ブロー工程と、
前記試運転工程後に、前記ガスタービンへの燃料供給を停止してから、前記復水器内及び前記復水ライン内の異物を除去する試運転後異物除去工程と、
を含む、
コンバインドサイクルプラントにおける蒸気系統のクリーニング方法。 - 請求項1に記載のコンバインドサイクルプラントにおける蒸気系統のクリーニング方法において、
前記間欠運転処理工程を前記試運転工程前に複数回実行する、
コンバインドサイクルプラントにおける蒸気系統のクリーニング方法。 - 請求項1又は2に記載のコンバインドサイクルプラントにおける蒸気系統のクリーニング方法において、
前記試運転処理工程は、部分負荷試運転処理工程を含み、
前記部分負荷試運転処理工程は、前記試運転工程の一部である部分負荷試運転工程と、前記連続ブロー工程の一部である部分負荷連続ブロー工程と、前記試運転後異物除去工程の一部である部分負荷後異物除去工程と、を含み、
前記部分負荷試運転工程では、前記蒸気止め弁が閉状態で前記バイパス弁が開状態で、前記ガスタービンに燃料を供給し、前記ガスタービンを部分負荷試運転し、
前記部分負荷連続ブロー工程では、前記部分負荷試運転工程中に、前記ガスタービンからの排気ガスの熱を利用して、前記排熱回収ボイラで蒸気を発生させ、前記主蒸気ラインの一部及び前記バイパスラインを介して、前記排熱回収ボイラからの蒸気を前記復水器内に流入させ、
前記部分負荷試運転工程後に、前記ガスタービンへの燃料供給を停止してから、前記部分負荷後異物除去工程を実行し、
前記部分負荷後異物除去工程では、前記復水器内及び前記復水ライン内の異物を除去する、
コンバインドサイクルプラントにおける蒸気系統のクリーニング方法。 - 請求項3に記載のコンバインドサイクルプラントにおける蒸気系統のクリーニング方法において、
前記部分負荷試運転処理工程を複数回実行する、
コンバインドサイクルプラントにおける蒸気系統のクリーニング方法。 - 請求項4に記載のコンバインドサイクルプラントにおける蒸気系統のクリーニング方法において、
前記蒸気タービンの定格運転時における前記主蒸気ライン内での蒸気により異物を吹き払う力に対して、前記間欠ブロー工程及び前記連続ブロー工程におけるブロー中における前記主蒸気ライン及び前記バイパスライン内での蒸気により異物を払う力の比をクリーニングフォース率とした場合、
複数回実行する前記部分負荷試運転処理工程のうち、少なくとも、最後に実行する部分負荷試運転処理工程中の前記部分負荷連続ブロー工程では、前記バイパス弁の動作を調節して、前記クリーニングフォース率を1以上にする、
コンバインドサイクルプラントにおける蒸気系統のクリーニング方法。 - 請求項5に記載のコンバインドサイクルプラントにおける蒸気系統のクリーニング方法において、
前記間欠ブロー工程では、前記バイパス弁の動作を調節して、前記クリーニングフォース率を1未満にする、
コンバインドサイクルプラントにおける蒸気系統のクリーニング方法。 - 請求項1又は2に記載のコンバインドサイクルプラントにおける蒸気系統のクリーニング方法において、
前記試運転処理工程は、部分負荷試運転処理工程を含み、
前記部分負荷試運転処理工程は、第一負荷試運転処理工程と、前記第一負荷試運転処理後に実行する第二負荷試運転処理工程を含み、
前記第一負荷試運転処理工程は、前記試運転工程の一部である第一負荷試運転工程と、前記連続ブロー工程の一部である第一負荷連続ブロー工程と、前記試運転後異物除去工程の一部である第一負荷後異物除去工程と、を含み、
前記第一負荷試運転工程では、前記蒸気止め弁が閉状態で前記バイパス弁が開状態で、前記ガスタービンに燃料を供給し、前記ガスタービンを定格負荷よりも小さい第一負荷で試運転し、
前記第一負荷連続ブロー工程では、前記第一負荷試運転工程中に、前記ガスタービンからの排気ガスの熱を利用して、前記排熱回収ボイラで蒸気を発生させ、前記主蒸気ラインの一部及び前記バイパスラインを介して、前記排熱回収ボイラからの蒸気を前記復水器内に流入させ、
前記第一負荷試運転工程後に、前記ガスタービンへの燃料供給を停止してから、前記第一負荷後異物除去工程を実行し、
前記第一負荷後異物除去工程では、前記復水器内及び前記復水ライン内の異物を除去し、
前記第二負荷試運転処理工程は、前記試運転工程の一部である第二負荷試運転工程と、前記連続ブロー工程の一部である第二負荷連続ブロー工程と、前記試運転後異物除去工程の一部である第二負荷後異物除去工程と、を含み、
前記第二負荷試運転工程では、前記蒸気止め弁が閉状態で前記バイパス弁が開状態で、前記ガスタービンに燃料を供給し、前記ガスタービンを前記第一負荷よりも大きく且つ前記定格負荷よりも小さな第二負荷で試運転し、
前記第二負荷連続ブロー工程では、前記第二負荷試運転工程中に、前記ガスタービンからの排気ガスの熱を利用して、前記排熱回収ボイラで蒸気を発生させ、前記主蒸気ラインの一部及び前記バイパスラインを介して、前記排熱回収ボイラからの蒸気を前記復水器内に流入させ、
前記第二負荷試運転工程後に、前記ガスタービンへの燃料供給を停止してから、前記第二負荷後異物除去工程を実行し、
前記第二負荷後異物除去工程では、前記復水器内及び前記復水ライン内の異物を除去する、
コンバインドサイクルプラントにおける蒸気系統のクリーニング方法。 - 請求項7に記載のコンバインドサイクルプラントにおける蒸気系統のクリーニング方法において、
前記蒸気タービンの定格運転時における前記主蒸気ライン内での蒸気により異物を吹き払う力に対して、前記間欠ブロー工程及び前記連続ブロー工程におけるブロー中における前記主蒸気ライン及び前記バイパスライン内での蒸気により異物を払う力の比をクリーニングフォース率とした場合、
前記第二負荷連続ブロー工程では、前記バイパス弁の動作を調節して、前記クリーニングフォース率を1以上にする、
コンバインドサイクルプラントにおける蒸気系統のクリーニング方法。 - 請求項8に記載のコンバインドサイクルプラントにおける蒸気系統のクリーニング方法において、
前記間欠ブロー工程、及び前記第一負荷連続ブロー工程では、前記バイパス弁の動作を調節して、前記クリーニングフォース率を1未満にする、
コンバインドサイクルプラントにおける蒸気系統のクリーニング方法。 - 請求項3から9のいずれか一項に記載のコンバインドサイクルプラントにおける蒸気系統のクリーニング方法において、
前記試運転処理工程は、前記部分負荷試運転処理工程前に実行する無負荷試運転処理工程を含み、
前記無負荷試運転処理工程は、前記試運転工程の一部である無負荷試運転工程と、前記連続ブロー工程の一部である無負荷連続ブロー工程と、前記試運転後異物除去工程の一部であるの無負荷後異物除去工程と、を含み、
前記無負荷試運転工程では、前記蒸気止め弁が閉状態で前記バイパス弁が開状態で、前記ガスタービンに燃料を供給し、前記ガスタービンを無負荷試運転し、
前記無負荷連続ブロー工程では、前記無負荷試運転工程中に、前記ガスタービンからの排気ガスの熱を利用して、前記排熱回収ボイラで蒸気を発生させ、前記主蒸気ラインの一部及び前記バイパスラインを介して、前記排熱回収ボイラからの蒸気を前記復水器内に流入させ、
前記無負荷試運転工程後に、前記ガスタービンへの燃料供給を停止してから、前記無負荷後異物除去工程を実行し、
前記無負荷後異物除去工程では、前記復水器内及び前記復水ライン内の異物を除去する、
コンバインドサイクルプラントにおける蒸気系統のクリーニング方法。 - 請求項10に記載のコンバインドサイクルプラントにおける蒸気系統のクリーニング方法において、
前記無負荷試運転処理工程を複数回実行する、
コンバインドサイクルプラントにおける蒸気系統のクリーニング方法。 - 請求項10又は11に記載のコンバインドサイクルプラントにおける蒸気系統のクリーニング方法において、
前記蒸気タービンの定格運転時における前記主蒸気ライン内での蒸気により異物を吹き払う力に対して、前記連続ブロー工程におけるブロー中における前記主蒸気ライン及び前記バイパスライン内での蒸気により異物を払う力の比をクリーニングフォース率とした場合、
前記無負荷連続ブロー工程では、前記バイパス弁の動作を調節して、前記クリーニングフォース率を1未満にする、
コンバインドサイクルプラントにおける蒸気系統のクリーニング方法。
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