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WO2011104759A1 - Centrale thermique et son procédé de fonctionnement, procédé d'amélioration de la centrale thermique, installation de turbine à vapeur destinée à être utilisée dans la centrale thermique, appareil de séparation/collecte de dioxyde de carbone, et désurchauffeur - Google Patents

Centrale thermique et son procédé de fonctionnement, procédé d'amélioration de la centrale thermique, installation de turbine à vapeur destinée à être utilisée dans la centrale thermique, appareil de séparation/collecte de dioxyde de carbone, et désurchauffeur Download PDF

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Publication number
WO2011104759A1
WO2011104759A1 PCT/JP2010/001302 JP2010001302W WO2011104759A1 WO 2011104759 A1 WO2011104759 A1 WO 2011104759A1 JP 2010001302 W JP2010001302 W JP 2010001302W WO 2011104759 A1 WO2011104759 A1 WO 2011104759A1
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WIPO (PCT)
Prior art keywords
steam
extracted
boiler
carbon dioxide
turbine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2010/001302
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English (en)
Japanese (ja)
Inventor
三島信義
杉浦尊
小坂哲也
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Hitachi Ltd
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Hitachi Ltd
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Publication date
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Priority to JP2012501527A priority Critical patent/JP5526219B2/ja
Priority to PCT/JP2010/001302 priority patent/WO2011104759A1/fr
Publication of WO2011104759A1 publication Critical patent/WO2011104759A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
    • F01K7/22—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type the turbines having inter-stage steam heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1456—Removing acid components
    • B01D53/1475—Removing carbon dioxide
    • 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
    • Y02E20/32—Direct CO2 mitigation

Definitions

  • the present invention relates to a fossil fuel-fired thermal power generation system equipped with a carbon dioxide separation and recovery device.
  • a device PCC: Post Combustion CO 2 Capture
  • PCC Post Combustion CO 2 Capture
  • the absorption liquid is circulated between the absorption tower and the regeneration tower by driving the absorption liquid circulation pump, and is contained in the boiler exhaust gas in the absorption tower.
  • the absorbed carbon dioxide is absorbed in the absorption liquid, and the carbon dioxide absorbed in the absorption liquid is separated and recovered by the regeneration tower.
  • the carbon dioxide component in the boiler exhaust gas and the absorbing solution are brought into contact with each other in the absorption tower, and the absorbing solution at about 40 ° C. absorbs carbon dioxide through a chemical reaction (exothermic reaction) with the carbon dioxide in the gas.
  • lean absorption liquid supplied from the regeneration tower
  • the reboiler supplying heating steam to the regeneration tower needs to generate a large amount of heating steam.
  • Japanese Patent No. 4274646 discloses a fossil fuel-fired thermal power generation system equipped with a carbon dioxide separation and recovery device for generating a steam turbine having a high-pressure turbine, an intermediate-pressure turbine, and a low-pressure turbine, and steam for driving them.
  • Boiler a carbon dioxide absorption tower having a carbon dioxide absorption liquid for absorbing and removing carbon dioxide from the combustion exhaust gas of the boiler, and a regeneration tower for regenerating the carbon dioxide absorption liquid that has absorbed carbon dioxide are removed.
  • a compressor for compressing the carbon dioxide a compressor turbine driven by a part of the exhaust steam of the high pressure turbine, an auxiliary turbine driven by a part of the exhaust steam of the intermediate pressure turbine, a compressor turbine, Supply pipe for supplying the exhaust steam from the auxiliary turbine to the reboiler of the regeneration tower as a heating source It discloses a system with.
  • the present invention provides a carbon dioxide separation that can improve the efficiency including the boiler by recovering more excess superheat energy of the extracted steam sent from the steam turbine to the reboiler and collecting it in the water supply system of the steam turbine. It aims at providing the thermal power generation system provided with the collection
  • a boiler a steam turbine driven by steam generated by the boiler, a condenser that cools and condenses the steam that drives the steam turbine, and water that is condensed by the condenser is supplied to the boiler.
  • a thermal power generation system equipped with a water supply system to be sent to a boiler and a carbon dioxide separation and recovery device for separating carbon dioxide from boiler exhaust gas generated in the boiler, the steam is extracted from the steam turbine and sent to the reboiler of the carbon dioxide separation and recovery device Heat exchange between the extracted steam and the feed water sent from the condenser to the boiler.
  • the amount of fuel used by the boiler can be greatly reduced, the amount of exhaust gas from the boiler can be reduced, and the amount of carbon dioxide emitted from the boiler can be reduced.
  • thermal power generation system according to the first embodiment of the present invention will be described with reference to FIG. 1 and FIG.
  • the schematic configuration of the steam turbine equipment side system is shown in FIG. 1
  • the schematic configuration of the carbon dioxide separation and recovery device side system is shown in FIG.
  • a present Example shows the case where the steam turbine equipment 100 and the carbon dioxide separation and recovery apparatus 200 are newly installed.
  • the steam turbine facility 100 includes a boiler 1 that generates fossil fuel and generates steam, and a high-pressure turbine 2 and an intermediate-pressure turbine 3 that constitute a steam turbine that is rotationally driven by the steam generated by the boiler 1. , And a low-pressure turbine 4, a generator 5 that converts the rotational force of the steam turbine into electric power, a condenser 20 that condenses and condenses the steam that has rotationally driven the steam turbine, and condensate in the condenser 20.
  • the water supply system 101 which sends the converted water supply to the boiler 1 is provided.
  • the boiler 1 heats the feed water supplied from the condenser 20 with heat obtained by burning fossil fuel, and generates high-temperature and high-pressure steam.
  • the steam generated in the boiler 1 is sent to the high-pressure turbine 2, and power is generated in the high-pressure turbine 2 to reduce the pressure.
  • the steam that has driven the high-pressure turbine 2 is returned again to the boiler 1 and is heated again by the boiler 1 to become high-temperature reheated steam.
  • the reheated steam heated again by the boiler 1 is sent from the boiler 1 to the intermediate pressure turbine 3, and the intermediate pressure turbine 3 generates power to reduce the pressure.
  • the steam that has driven the intermediate-pressure turbine 3 flows down the crossover pipe 48 and is sent to the low-pressure turbine 4.
  • the low-pressure turbine 4 generates power and is further depressurized.
  • the steam that has driven the low-pressure turbine 4 is sent to the condenser 20, where it is cooled, condensed, and condensed.
  • the condensate condensated by the condenser 20 flows down the water supply system 101 as water supply, and is supplied to the boiler 1 again.
  • the high-pressure turbine 2, the intermediate-pressure turbine 3, the low-pressure turbine 4, and the generator 5 are connected via a turbine rotor, and the power of the turbine is taken out as electric power by the generator 5.
  • the water supply system 101 is a condenser pump 21, a ground condenser 22, a first low-pressure feed water heater 24, a second low-pressure feed water heater 25, and a third low-pressure feed water heater in this order from the condenser 20 toward the boiler 1. 26, a fourth low-pressure feed water heater 27, a deaerator 8, a boiler feed pump inlet booster pump 9, a boiler feed pump 10, and a high-pressure feed water heater 11.
  • the first low pressure feed water heater 24, the second low pressure feed water heater 25, the third low pressure feed water heater 26, and the fourth low pressure feed water heater 27 are respectively connected to the first extraction pipe 44 and the second extraction pipe from the low pressure turbine 4. 43, extraction steam is sent as a heating source through the third extraction pipe 42 and the fourth extraction pipe 41.
  • the water supply condensated by the condenser 20 is sent to the condensate pump 21 to be pressurized and sent to the ground condenser 22.
  • the feed water that has passed through the ground condenser 22 flows down the first low-pressure feed water heater 24, the second low-pressure feed water heater 25, the third low-pressure feed water heater 26, and the fourth low-pressure feed water heater 27 sequentially. Heat is exchanged with extracted steam in each feed water heater.
  • the drain of the second low-pressure feed water heater 25 flows down the second low-pressure feed water heater drain pipe 35 and is sent to the first low-pressure feed water heater 24.
  • the drain of the first low-pressure feed water heater 24 flows down the first low-pressure feed water heater drain pipe 36 and is collected in the condenser 20.
  • the drain of the fourth low-pressure feed water heater 27 flows down the fourth low-pressure feed water heater drain pipe 33 and is sent to the third low-pressure feed water heater 26.
  • the drain of the third low-pressure feed water heater 26 is sent to the third low-pressure feed water heater drain pump 37 to be pressurized, and flows down the third low-pressure feed water heater drain pipe 34 to constitute the feed water system 101. It returns to the heater drain pump outlet condensate pipe 38.
  • the third low-pressure feed water heater drain pump outlet condensate pipe 38 is a pipe connected to the third low-pressure feed water heater 26 and the fourth low-pressure feed water heater 27.
  • the carbon dioxide separation and recovery apparatus 200 includes an absorption tower 65 that absorbs carbon dioxide contained in boiler exhaust gas discharged from the boiler 1 of the steam turbine equipment 100 with an absorption liquid, and a carbon dioxide that is absorbed by the absorption tower 65.
  • the regenerator 72 separates carbon dioxide from the absorbing liquid that has absorbed carbon, and the reboiler 17 that generates steam and supplies the steam to the regenerating tower 72 as a heat source for separating carbon dioxide from the absorbing liquid.
  • the boiler 1 generates boiler exhaust gas containing carbon dioxide when fossil fuel is burned.
  • the boiler exhaust gas generated in the boiler 1 flows down from the boiler 1 through the boiler exhaust pipe 60 and is sent to the boiler exhaust gas booster fan 61 where the pressure is increased.
  • the boiler exhaust gas boosted by the boiler exhaust gas booster 61 is sent to the boiler exhaust gas cooler 62 and cooled, and then sent to the absorption tower 65.
  • the boiler exhaust gas sent to the absorption tower 65 absorbs carbon dioxide gas into the absorption liquid in the absorption tower 65 and becomes a processing gas not containing carbon dioxide.
  • the processing gas flows down from the absorption tower 65 through the absorption tower outlet boiler exhaust gas pipe 66, is sent to the chimney 67, and is discharged from the chimney 67 to the atmosphere.
  • the boiler exhaust gas that has not undergone the carbon dioxide separation and recovery process flows down the bypass gas pipe 64 branched from the boiler exhaust gas pipe 60 upstream of the boiler exhaust gas booster fan 61, and the absorption tower It joins the outlet boiler exhaust gas pipe 66 and is led to the chimney 67.
  • the bypass gas pipe 64 is provided with a bypass butterfly valve 63 that controls the flow rate of the bypass gas pipe 64. By controlling the opening degree of the bypass butterfly valve 63, the flow rate of the boiler exhaust gas that bypasses the carbon dioxide separation and recovery device 200 is controlled.
  • the rich absorbing liquid containing a large amount of carbon dioxide is absorbed in the boiler tower exhaust gas in the absorption tower 65 and sent to the rich absorbing liquid transfer pump 68 to be pressurized, and then the absorbing liquid heat exchanger 69. And heated to about 100 ° C.
  • the rich absorption liquid heated by the absorption liquid heat exchanger 69 is sent to the regeneration tower 72 and further heated to about 120 ° C. to 130 ° C. in the regeneration tower 72 to separate carbon dioxide gas absorbed from the boiler exhaust gas.
  • the carbon dioxide gas separated from the rich absorbent is sent from the regeneration tower 72 to the outlet gas cooler 73 and cooled.
  • the carbon dioxide gas cooled by the outlet gas cooler 73 is sent to the reflux drum 77, and moisture contained in the gas is separated.
  • the carbon dioxide gas from which moisture has been separated in the reflux drum 77 flows down the carbon dioxide exhaust pipe 78 and is supplied to a liquefied carbon dioxide storage facility (not shown).
  • the moisture separated from the carbon dioxide separation / recovery device in the reflux drum 77 is sent from the reflux drum 77 to the reflux drum pump 76, pressurized, and returned to the regeneration tower 72.
  • a part of the absorption liquid in the regeneration tower 72 is extracted through the regeneration tower absorption liquid extraction pipe 74 and sent to the reboiler 17.
  • the absorption liquid sent to the reboiler 17 is heated in the reboiler 17 to become steam.
  • the absorbing liquid that has become steam in the reboiler 17 flows down the reboiler outlet steam pipe 75 and is returned to the regeneration tower 72.
  • the reboiler 17 is supplied with the extracted steam extracted from the intermediate pressure turbine 3 through the extracted steam supply system 102 as a heating source.
  • the absorbing liquid is heated by the supplied extracted steam to generate steam.
  • the absorption liquid from which the carbon dioxide gas has been separated in the regeneration tower 72 is sent from the regeneration tower 72 to the absorption liquid heat exchanger 69 and is cooled by exchanging heat with the rich absorption liquid in the absorption liquid heat exchanger 69.
  • the absorption liquid cooled in the absorption liquid heat exchanger 69 is sent to the lean absorption liquid transfer pump 71 to be pressurized, and sent to the lean absorption liquid cooler 70.
  • the absorption liquid sent to the lean absorption liquid cooler 70 is returned to the absorption tower 65 after being cooled.
  • the absorption liquid is configured to circulate between the absorption tower 65 and the regeneration tower 72.
  • the steam turbine equipment 100 is an extraction steam supply system that supplies extracted steam extracted from the intermediate pressure turbine 3 to the reboiler 17 of the carbon dioxide separation and recovery device 200. 102.
  • the extraction steam supply system 102 is connected to an extraction mechanism (not shown) and a reboiler 17 provided in an intermediate stage of the intermediate pressure turbine 3.
  • the extraction steam supply system 102 performs an extraction check valve 12, an extraction steam superheat reducer inlet valve 54, and an extraction steam superheat reduction process for preventing the backflow of the extraction steam in order from the intermediate pressure turbine 3 toward the reboiler 17.
  • the extraction steam superheat reducer 14, the extraction steam superheat reducer outlet valve 15, the reboiler heating steam inlet output control valve 16 that controls the amount and pressure of the extraction steam supplied to the reboiler 17, and the pressure of the steam supplied to the reboiler 17 are detected.
  • a reboiler heating steam pressure detector 58 is provided.
  • a part of the steam flowing down the intermediate pressure turbine 3 is extracted by the extraction mechanism provided in the intermediate stage, flows down the extraction steam supply system 102 as extraction steam, and is sent to the extraction steam superheat reducer 14.
  • the extracted steam sent to the extracted steam superheat reducer 14 is cooled to near the saturation temperature of the pressure of the air supply system by exchanging heat with the feed water sent from the water supply system 101 in the extracted steam superheat reducer 14. .
  • the extracted steam cooled and reduced in temperature in the extracted steam superheat reducer 14 passes through the reboiler heating steam inlet output control valve 16 and is sent to the reboiler 17.
  • the reboiler heating steam inlet output control valve 16 is controlled to open and close based on the detection signal of the reboiler heating steam pressure detector 58 installed at the inlet of the reboiler 17. By controlling the opening and closing of the reboiler heating steam inlet output control valve 16, the pressure and steam flow rate of the extracted steam supplied to the reboiler are controlled.
  • the extracted steam sent to the reboiler 17 exchanges heat with the absorbing solution sent from the regeneration tower 72 in the reboiler 17 and is cooled and drained.
  • the absorbing liquid is heated to become vapor. Since the absorption liquid in the regeneration tower 72 is heated to about 120 ° C. to 130 ° C. by the amount of heat supplied to the reboiler 17, carbon dioxide is separated from the absorption liquid, and at the same time, the absorption liquid is regenerated and regenerated. Water is sent to the absorption tower 65.
  • the extracted steam that has been cooled and drained by the reboiler 17 is sent to the reboiler drain pump 18 as hot water drain, and the pressure is increased.
  • the hot water drain boosted by the reboiler drain pump 18 flows down the reboiler drain pump outlet water supply pipe 19 and is sent to the third low-pressure feed water heater 26.
  • the hot water drain sent to the third low-pressure feed water heater 26 is heat-recovered by exchanging heat with the feed water, and flows down through the third low-pressure feed water heater drain pipe 34 and returned to the feed water system 101.
  • the water supply system 101 includes a water supply branch system 103 that guides a part of the water supply to the extraction steam superheat reducer 14, exchanges heat with the extraction steam in the extraction steam superheat reduction apparatus 14, and then returns to the deaerator 8.
  • the feed water branch system 103 branches from the feed water system 101 between the fourth low-pressure feed water heater 27 and the deaerator 8 and adjusts the distribution amount of the feed water from the upstream side to the downstream side in the feed water flow direction.
  • Condensate flow distribution valve 29, extraction steam superheat reducer inlet condensate pipe 30 connected from condensate flow distribution valve 29 to extraction steam superheat reducer 14, and extraction extracted from extraction steam heating reducer 14 to deaerator 8 A steam superheat reducer outlet condensate pipe 31.
  • the water supply system 101 includes a superheat reducer bypass water supply system 104 that is connected from the condensate flow distribution valve 29 to the deaerator 8 and bypasses the extracted steam superheat reducer 14 with a part of the water supply.
  • the overheat reducer bypass water supply system 104 is configured by an extraction steam overheat reducer bypass condenser pipe 32.
  • the first to fourth low-pressure feed water heaters of the feed water system 101 are sequentially flowed down and heated, and the heated feed water is divided into the extracted steam superheat reducer 14 side and the deaerator 8 side by the condensate flow rate distribution valve 29. Is done.
  • the feed water distributed to the extraction steam superheat reducer 14 side by the condensate flow distribution valve 29 flows down the extraction steam superheat reducer inlet condensate pipe 30 and is supplied to the extraction steam superheat reducer 14.
  • the feed water supplied to the extraction steam superheat reducer exchanges heat with the extraction steam, recovers excess superheat energy of the extraction steam, and raises the temperature.
  • the feed water that has recovered the superheat energy of the extracted steam by the extracted steam superheat reducer 14 flows down the extracted steam superheat reducer outlet condensate pipe 31 and is sent to the deaerator 8.
  • the feed water distributed to the deaerator 8 side by the condensate flow distribution valve 29 flows down the extraction steam superheat reducer bypass condensate pipe 32, bypasses the extraction steam superheat reducer 14 and directly enters the deaerator 8. Sent.
  • Supplied water split to the extracted steam superheat reducer 14 side and the deaerator 8 side is joined again by the deaerator 8, flows down the water supply system 101, and is sent to the boiler 1.
  • the extraction steam supply system 102 includes an overheat reducer bypass extraction steam system 105 that branches from the extraction steam supply system 102 upstream of the extraction steam superheat reducer inlet valve 54 and is connected to the deaerator 8.
  • the superheat reducer bypass bleed steam system 105 guides a part of the bleed steam flowing down the bleed steam supply system 102 directly to the water supply system 101 of the steam turbine equipment, bypassing the reboiler 17 of the carbon dioxide separation and recovery device 200.
  • the extracted steam guided to the deaerator 8 is used as a heating source of feed water in the deaerator.
  • the feed water temperature at the deaerator inlet, that is, the outlet of the fourth low-pressure feed water heater is an optimum temperature for exchanging heat with the extracted steam, and guides the extracted steam to the deaerator 8.
  • the carbon dioxide separation and recovery apparatus 200 adjusts the amount of carbon dioxide recovered from the boiler exhaust gas by opening and closing control of the bypass butterfly valve 63 provided in the bypass gas pipe 64.
  • the amount of extracted steam required by the reboiler 17 also varies due to the variation in the amount of carbon dioxide recovered from the boiler exhaust gas. There may be a case where a part of the extracted steam becomes redundant in accordance with the fluctuation of the extracted steam amount required by the reboiler 17.
  • surplus extracted steam is caused to flow to the superheat reducer bypass extracted steam system 105 in accordance with the fluctuation of the extracted steam amount required by the reboiler 17 and returned to the water supply system 101.
  • the amount of water supplied to the extraction steam superheat reducer 14 needs to be changed in accordance with the change of the extraction steam amount required by the reboiler 17.
  • the water supply distribution amount to the water supply branch system 103 and the overheat reducer bypass water supply system 104 is adjusted by the condensate flow rate distribution valve 29 in accordance with the fluctuation of the amount of extracted steam required by the reboiler 17.
  • the steam required by the reboiler 17 of the carbon dioxide separation and recovery device 200 is not superheated steam but saturated steam of about 3 atg, and its saturation temperature is 143 ° C.
  • the pressure / temperature of the extracted steam extracted from the intermediate pressure turbine 3 is about 9 atg / 370 ° C. Accordingly, since the degree of superheat of the extracted steam is high and the temperature difference from the required temperature 143 ° C. of the reboiler 17 is as large as 227 ° C., if the extracted steam is supplied to the reboiler 17 as it is, the temperature of both cannot be matched.
  • the steam extracted from the steam turbine is cooled by heat exchange with the feed water of the steam turbine, and the cooled steam is sent to the reboiler. It is possible to return the overheated energy to the heat cycle of the steam turbine, and it is possible to suppress a decrease in efficiency due to extraction.
  • an extraction steam superheat reducer 14 for exchanging heat between the extraction steam of the intermediate pressure turbine 3 and the feed water before entering the deaerator 8 is provided to effectively recover the heat of the extraction steam. Yes. By means of recovering the superheated energy of the extracted steam again in the steam turbine cycle, it becomes possible to suppress the output and efficiency of the steam turbine.
  • the feed water temperature rises, so the boiler fuel can be reduced and the efficiency including the boiler can be improved.
  • the steam turbine efficiency is estimated to be improved by 2% to 3% (absolute value) as compared with the system in which the back pressure turbine is driven with extracted steam and the power is recovered and then supplied to the reboiler.
  • the amount of fuel used by the boiler is greatly reduced, the amount of exhaust gas from the boiler is reduced, and the effect of reducing not only the economic effect but also the amount of carbon dioxide emitted from the boiler can be obtained.
  • the steam itself supplied to the reboiler may be superheated steam of 3 atg or more. Therefore, it is not always necessary to extract air from the intermediate pressure turbine if the pressure and temperature conditions are satisfied.
  • the turbine has a characteristic that when the partial load operation is performed, the bleed pressure of all the turbines decreases approximately in proportion. Therefore, when the turbine is operated at a partial load, if the air is extracted from the low-pressure turbine, a required pressure of about 3 atg or more required by the reboiler cannot be secured. Therefore, even if the turbine is partially loaded, in order to ensure the minimum extraction pressure of about 3 atg or more required by the reboiler, the extraction is performed from the intermediate pressure turbine exhaust section where the extraction pressure is higher than that of the low pressure turbine. Note that when the air is extracted from the high-pressure turbine, it is too higher than the required pressure, so that the throttle pressure reduction width of the extracted steam pressure increases and the turbine efficiency is lowered.
  • FIG. 3 is a schematic configuration diagram of the steam turbine equipment side system of the thermal power generation system according to the second embodiment of the present invention.
  • symbol is attached
  • the carbon dioxide separation and recovery device is the same as that of the first embodiment, and the description thereof is omitted.
  • This embodiment differs from the embodiment shown in FIG. 1 in that the extraction steam supply system 102 is downstream of the superheat reducer bypass extraction steam system 105 and upstream of the extraction steam superheat reducer inlet valve 54. On the side, an extraction steam escape system 106 branched from the extraction steam supply system 102 and connected to the condenser 20 is provided.
  • the extraction steam relief system 106 has an emergency pressure relief extraction pressure detector 57, an emergency pressure relief stop valve 52, and an emergency pressure relief adjustment valve 55 from the upstream side toward the downstream side where the condenser 20 is located. .
  • the reboiler heating steam inlet output control valve 16 that controls the amount and pressure of the extracted steam supplied to the reboiler 17 is closed, and the air supply from the intermediate pressure turbine 3 to the reboiler 17 is performed. And the extraction steam superheat reducer inlet valve 54 and the extraction steam superheat reducer outlet valve 15 are closed to isolate the extraction steam superheat reducer 14 from the extraction steam supply system 102.
  • an operation is performed to switch the amount of water supply passing through the main valve to the entire amount superheat reducer bypass water supply system 104 side through the extraction steam superheat reducer bypass condensate pipe 32 using the condensate flow distribution valve 29.
  • the bleed steam surplus due to the stop of the air supply to the reboiler 17 is operated by opening the emergency pressure relief valve 52 and adjusting the opening of the emergency pressure relief regulating valve 55 to adjust the pressure. To the condenser 20.
  • the abnormal pressure rise of the extracted steam is detected by the emergency pressure relief extraction pressure detector 57, and the emergency pressure relief regulating valve 55 is opened.
  • the same effects as those of the first embodiment can be obtained, and the reliability of the thermal power generation system can be improved. That is, when the carbon dioxide separation / recovery device 200 is urgently stopped for some reason, it is possible to prevent unnecessary inflow of condensate to the extracted steam superheat reducer 14 as soon as possible. Further, by stopping the supply of air to the reboiler 17, surplus extracted steam is released to the condenser 20 via the extracted steam escape system 106, thereby preventing a rapid increase in the flow rate of the inflow steam to the low-pressure turbine 4, A rapid load increase of the low-pressure turbine 4 can be suppressed, and the reliability of the system can be improved.
  • FIG. 4 is a schematic configuration diagram of the steam turbine equipment side system of the thermal power generation system according to the third embodiment of the present invention.
  • symbol is attached
  • the carbon dioxide separation and recovery device is the same as that of the first embodiment, and the description thereof is omitted.
  • This example shows a case where a new carbon dioxide separation and recovery device is newly installed in the existing steam turbine equipment.
  • the extraction steam supply system 102 When the carbon dioxide separation and recovery device 200 is additionally installed in the existing steam turbine equipment 100, the extraction steam supply system 102, the feed water branch system 103, the overheat reducer bypass feed water system 104, and the overheat reducer bypass extraction steam system 105 are combined. To be added. A bleed steam escape system 106 may also be installed.
  • the extraction steam superheating reducer 14 is provided in the extraction steam supply system 102 to exchange heat between the extraction steam supplied to the reboiler 17 and the water supplied to the boiler 1.
  • the extraction steam supply system 102 is additionally installed, and the extraction steam cooled and drained by the reboiler 17 is recovered by the third low-pressure feed water heater 26, so that the reboiler drain pump outlet water supply pipe 19 is additionally installed.
  • a reboiler drain pump 18 is installed in the reboiler drain pump outlet water supply pipe 19.
  • the capacity is increased by replacing the third low-pressure feed water heater 26 and the third low-pressure feed water heater drain pump 37 in order to collect the drained extracted steam.
  • the pipe between the fourth low-pressure feed water heater 27 and the deaerator 8 is replaced with a third low-pressure feed water heater outlet condensate pipe 28 and a condensate flow distribution valve 29, and the feed water branch system 103, An overheat reducer bypass water supply system 104 is additionally installed.
  • the deaerator 8 is connected to the feed water branch system 103, the overheat reducer bypass feed water system 104, and the overheat reducer bypass bleed steam system 105, so that the capacity is increased by replacement or the like.
  • the condenser 20 when installing the extraction steam escape system 106, the condenser 20 is replaced as necessary to increase the capacity.
  • the condenser 20 is not required to be replaced, and the modification cost can be reduced.
  • an existing modified intermediate pressure turbine exhaust pressure regulating valve 40 and a crossover pipe pressure detector 59 are additionally provided in the crossover pipe 45. There is a feature in the point.
  • the detected value of the crossover pipe pressure detector 59 is set so that the pressure of the exhaust section of the intermediate pressure turbine 3 when the carbon dioxide recovery device is not installed and the pressure of the exhaust section of the intermediate pressure turbine 3 after installation are the same pressure.
  • the intermediate pressure turbine exhaust pressure regulating valve 40 is throttled through a control device (not shown).
  • the upstream pressure of the intermediate pressure turbine exhaust pressure adjustment valve is increased to reduce the amount of steam to the low pressure turbine 4, and control is performed to prevent an excessive decrease in the exhaust pressure of the existing intermediate pressure turbine.
  • the present embodiment even when a carbon dioxide separation and recovery device is newly installed in the existing steam turbine equipment, the same effect as in the first embodiment can be obtained. Further, even when a carbon dioxide separation and recovery device is newly installed and the supply steam is extracted for the newly installed reboiler, a significant decrease in the exhaust pressure of the existing medium pressure turbine is prevented, and extraction to the extraction steam supply system 102 is performed. The pressure required for steam supply can be secured.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Treating Waste Gases (AREA)
  • Gas Separation By Absorption (AREA)
  • Carbon And Carbon Compounds (AREA)

Abstract

Il devient possible de collecter une énergie de surchauffe excédentaire d'une vapeur de purge devant être distribuée depuis une turbine à vapeur à un rebouilleur dans une conduite d'eau d'alimentation de la turbine à vapeur dans une quantité supérieure, ce qui permet d'améliorer l'efficacité de la collecte. Ainsi, l'invention concerne une centrale thermique comprenant : une chaudière (1), une turbine à vapeur, un condenseur d'eau (20) ; une conduite d'eau d'alimentation (101) par le biais de laquelle l'eau d'alimentation condensée dans le condenseur d'eau (20) est distribuée à la chaudière ; une unité de séparation/collecte de dioxyde de carbone (200) dans laquelle le dioxyde de carbone est séparé d'un gaz d'échappement de chaudière généré dans la chaudière ; une conduite d'alimentation en vapeur de purge (102) par le biais de laquelle la vapeur de purge purgée de la turbine à vapeur est distribuée au rebouilleur (17) dans l'unité de séparation/collecte de dioxyde de carbone (200) ; et un désurchauffeur (14) qui est disposé dans la conduite d'alimentation en vapeur de purge (102) et qui permet d'obtenir un échange thermique entre la vapeur de purge devant être distribuée au rebouilleur (17) et l'eau d'alimentation. Le système permet de collecter une énergie de surchauffe de la vapeur de purge dans le cycle thermique de la turbine à vapeur sans avoir besoin de diminuer la température ou la pression de la vapeur purgée de la turbine à vapeur au moyen d'un pulvérisateur, et permet par conséquent d'empêcher la détérioration de l'efficacité de la collecte susceptible d'être provoquée par la vapeur de purge.
PCT/JP2010/001302 2010-02-26 2010-02-26 Centrale thermique et son procédé de fonctionnement, procédé d'amélioration de la centrale thermique, installation de turbine à vapeur destinée à être utilisée dans la centrale thermique, appareil de séparation/collecte de dioxyde de carbone, et désurchauffeur Ceased WO2011104759A1 (fr)

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JP2012501527A JP5526219B2 (ja) 2010-02-26 2010-02-26 火力発電システム、およびその運転方法，火力発電システムの改造方法，火力発電システムに用いられる蒸気タービン設備，二酸化炭素分離回収装置，過熱低減器
PCT/JP2010/001302 WO2011104759A1 (fr) 2010-02-26 2010-02-26 Centrale thermique et son procédé de fonctionnement, procédé d'amélioration de la centrale thermique, installation de turbine à vapeur destinée à être utilisée dans la centrale thermique, appareil de séparation/collecte de dioxyde de carbone, et désurchauffeur

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PCT/JP2010/001302 WO2011104759A1 (fr) 2010-02-26 2010-02-26 Centrale thermique et son procédé de fonctionnement, procédé d'amélioration de la centrale thermique, installation de turbine à vapeur destinée à être utilisée dans la centrale thermique, appareil de séparation/collecte de dioxyde de carbone, et désurchauffeur

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EP2568130A3 (fr) * 2011-09-12 2014-04-02 Hitachi Ltd. Système de récupération de chaleur de la chaudière avec système de capture de CO2
CN109404075A (zh) * 2018-11-30 2019-03-01 上海电气电站设备有限公司 小汽轮机背压控制热力系统及其控制方法
CN109539233A (zh) * 2018-12-26 2019-03-29 常州市长江热能有限公司 一种低压除氧器和高压除氧器排汽回收系统
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EP3715593A1 (fr) * 2019-03-28 2020-09-30 Mitsubishi Hitachi Power Systems, Ltd. Centrale électrique et procédé de commande de l'augmentation de la puissance de sortie pour centrale électrique
CN112240232A (zh) * 2019-07-16 2021-01-19 三菱动力株式会社 蒸汽发电设备、蒸汽发电设备的改造方法以及蒸汽发电设备的运转方法
JP2023003302A (ja) * 2021-06-23 2023-01-11 株式会社東芝 二酸化炭素回収システムの加熱蒸気系統、二酸化炭素回収システムおよび二酸化炭素回収システムの加熱蒸気系統の運用方法
CN117771922A (zh) * 2024-02-26 2024-03-29 中国电力工程顾问集团华东电力设计院有限公司 一种全烟气二氧化碳捕集系统

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EP2568130A3 (fr) * 2011-09-12 2014-04-02 Hitachi Ltd. Système de récupération de chaleur de la chaudière avec système de capture de CO2
JP2013130340A (ja) * 2011-12-22 2013-07-04 Mitsubishi Heavy Ind Ltd Ｃｏ２回収装置付き石炭焚き火力発電プラントの制御システム及び制御方法
JP2013151876A (ja) * 2012-01-24 2013-08-08 Toshiba Corp 二酸化炭素分離回収装置、二酸化炭素回収型汽力発電システム、及び二酸化炭素回収型汽力発電システムの運転方法
US20140033716A1 (en) * 2012-07-31 2014-02-06 Kabushiki Kaisha Toshiba Steam turbine plant, control method of same, and control system of same
JP2014029139A (ja) * 2012-07-31 2014-02-13 Toshiba Corp 蒸気タービンプラント、その制御方法、およびその制御システム
CN109404075A (zh) * 2018-11-30 2019-03-01 上海电气电站设备有限公司 小汽轮机背压控制热力系统及其控制方法
CN109539233A (zh) * 2018-12-26 2019-03-29 常州市长江热能有限公司 一种低压除氧器和高压除氧器排汽回收系统
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EP3715593A1 (fr) * 2019-03-28 2020-09-30 Mitsubishi Hitachi Power Systems, Ltd. Centrale électrique et procédé de commande de l'augmentation de la puissance de sortie pour centrale électrique
US10941677B2 (en) 2019-03-28 2021-03-09 Mitsubishi Power, Ltd. Power plant and power output increase controlling method for power plant
CN112240232A (zh) * 2019-07-16 2021-01-19 三菱动力株式会社 蒸汽发电设备、蒸汽发电设备的改造方法以及蒸汽发电设备的运转方法
JP2021014839A (ja) * 2019-07-16 2021-02-12 三菱パワー株式会社 スチームパワー発電プラント、スチームパワー発電プラントの改造方法及びスチームパワー発電プラントの運転方法
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JP2023003302A (ja) * 2021-06-23 2023-01-11 株式会社東芝 二酸化炭素回収システムの加熱蒸気系統、二酸化炭素回収システムおよび二酸化炭素回収システムの加熱蒸気系統の運用方法
JP7561094B2 (ja) 2021-06-23 2024-10-03 株式会社東芝 二酸化炭素回収システムの加熱蒸気系統、二酸化炭素回収システムおよび二酸化炭素回収システムの加熱蒸気系統の運用方法
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