WO2019187782A1 - Système de refroidissement de gaz combustible et installation de turbine à gaz - Google Patents

Système de refroidissement de gaz combustible et installation de turbine à gaz Download PDF

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Publication number
WO2019187782A1
WO2019187782A1 PCT/JP2019/005937 JP2019005937W WO2019187782A1 WO 2019187782 A1 WO2019187782 A1 WO 2019187782A1 JP 2019005937 W JP2019005937 W JP 2019005937W WO 2019187782 A1 WO2019187782 A1 WO 2019187782A1
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WIPO (PCT)
Prior art keywords
gas
cooling water
fuel gas
turbine
fuel
Prior art date
Application number
PCT/JP2019/005937
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English (en)
Japanese (ja)
Inventor
佳一 宇井
浩史 田邉
崇 白岩
Original Assignee
三菱日立パワーシステムズ株式会社
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Application filed by 三菱日立パワーシステムズ株式会社 filed Critical 三菱日立パワーシステムズ株式会社
Priority to CN201980021471.1A priority Critical patent/CN111902620B/zh
Priority to KR1020207027654A priority patent/KR102380316B1/ko
Publication of WO2019187782A1 publication Critical patent/WO2019187782A1/fr

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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
    • F02C3/00—Gas-turbine plants characterised by the use of combustion products as the working fluid
    • F02C3/20—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products
    • F02C3/22—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products the fuel or oxidant being gaseous at standard temperature and pressure
    • 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
    • F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
    • F02C7/12—Cooling of plants
    • F02C7/14—Cooling of plants of fluids in the plant, e.g. lubricant or fuel
    • 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
    • F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
    • F02C7/22—Fuel supply systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K5/00—Feeding or distributing other fuel to combustion apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/28—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
    • 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
    • F05D2220/30—Application in turbines
    • F05D2220/32—Application in turbines in gas turbines
    • 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
    • F05D2260/00—Function
    • F05D2260/20—Heat transfer, e.g. cooling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]

Definitions

  • the present invention relates to, for example, a fuel gas cooling system that cools a fuel gas supplied to a gas turbine, and a gas turbine plant including the fuel gas cooling system.
  • the combined cycle plant first drives a gas turbine using natural gas or the like as a fuel to generate power for the first time, and then an exhaust heat recovery boiler recovers the heat of the exhaust gas from the gas turbine to generate steam.
  • the steam turbine is driven by steam to generate power for the second time.
  • the used steam that has driven the steam turbine is cooled by a condenser to become condensed water, and is returned to the exhaust heat recovery boiler.
  • blast furnace gas (BFG, Blast Furnace Gas) may be used as fuel supplied to the gas turbine.
  • Blast furnace gas is generated when pig iron is produced by reducing iron ore in a blast furnace, and is a high temperature.
  • the blast furnace gas is supplied to the combustor of the gas turbine as a high-temperature and high-pressure fuel gas by a gas compressor. Therefore, a gas cooler for cooling the blast furnace gas is provided in the fuel gas supply line.
  • Patent Document 1 As a power plant equipped with a gas cooler, for example, there is one described in Patent Document 1 below.
  • the power plant described in Patent Document 1 supplies part of the blast furnace gas to a gas cooler, cools the blast furnace gas by bringing cooling water into contact with it, and mixes the fuel gas having a lowered temperature with the high temperature blast furnace gas. After that, it is supplied to the gas turbine.
  • the gas cooler is provided with a hopper for storing cooling water at a lower portion, and a cooling water return pipe for returning the cooling water to the cooling water pit is connected to the hopper.
  • a siphon break is provided in the water return pipe. This siphon break unit stops the discharge of the cooling water from the hopper of the gas cooler when the supply of the cooling water to the gas cooler stops, and the fuel gas from the gas cooler Is to prevent leakage.
  • the siphon break portion is open to the atmosphere, the air taken in from the open portion is mixed into the cooling water, and oxygen in the air is mixed into the fuel gas in the gas cooler. Then, the fuel gas mixed with oxygen is supplied to the gas turbine through the electric dust collector, which may adversely affect the electric dust collector and the gas turbine.
  • the present invention solves the above-described problems, and an object of the present invention is to provide a fuel gas cooling system and a gas turbine plant that ensure safety and improve reliability.
  • a fuel gas cooling system includes a gas cooler that cools fuel gas in contact with cooling water, and a discharge path that discharges cooling water stored in the gas cooler.
  • a siphon part provided in the discharge path, an inert gas storage part for storing an inert gas, a communication path in which one end part communicates with the siphon part and the other end part communicates with the inert gas storage part
  • the fuel gas is cooled by contact with the cooling water by the gas cooler, and the cooling water that has cooled the fuel gas is stored in the lower part of the gas cooler and then discharged to the outside from the discharge path.
  • the inert gas is supplied from the communication path to the siphon part of the discharge path when the amount of cooling water in the lower part of the gas cooler is reduced.
  • the discharge of the cooling water from the cooler is stopped, and a predetermined amount of cooling water is secured in the lower part of the gas cooler.
  • the siphon part is connected to the inert gas storage part via the discharge path, oxygen in the air does not enter the gas cooler and mix into the fuel gas, ensuring safety. Reliability can be improved.
  • the fuel gas cooling system of the present invention is characterized in that the inert gas reservoir is maintained at a positive pressure higher than the atmospheric pressure.
  • the inert gas reservoir is maintained at a positive pressure higher than the atmosphere, when the supply of cooling water to the gas cooler is stopped and the amount of cooling water in the lower part of the gas cooler is reduced,
  • the inert gas in the gas storage unit can be appropriately supplied from the communication path to the siphon unit, and the discharge of the cooling water from the gas cooler can be stopped.
  • the fuel gas cooling system of the present invention is characterized in that a cooling water storage part for storing cooling water discharged through the discharge path is provided, and the inert gas storage part is provided in the cooling water storage part. .
  • a wet electrostatic precipitator that removes foreign matters contained in the fuel gas cooled by the gas cooler is provided, a cleaning water reservoir is provided in the wet electrostatic precipitator, and the cleaning water The inert gas reservoir is provided in the reservoir.
  • the other end of the communication path with one end communicating with the siphon unit is communicated with the wet electrostatic precipitator to the washing water storage unit, so there is no need to provide a separate inert gas storage unit, thereby suppressing the increase in size of the equipment. can do.
  • the gas turbine plant of the present invention includes a gas turbine having a compressor, a combustor, and a turbine, and the fuel gas cooling system that cools fuel supplied to the combustor. It is.
  • the fuel gas is cooled by contact with the cooling water by the gas cooler, supplied to the combustor of the gas turbine through the fuel gas supply line, and combusted.
  • the cooling water that has cooled the fuel gas is stored in the lower part of the gas cooler and then discharged to the outside through the discharge path.
  • oxygen in the air does not enter the gas cooler and enter the fuel gas supply line.
  • the electrostatic precipitator is arranged, the fuel gas does not adversely affect the electrostatic precipitator and the combustor, and safety can be ensured and reliability can be improved.
  • FIG. 1 is a schematic configuration diagram showing a combined cycle plant to which the fuel gas cooling system of the present embodiment is applied.
  • FIG. 2 is a schematic configuration diagram showing the fuel gas cooling system of the present embodiment.
  • FIG. 3 is a schematic configuration diagram showing a modification of the fuel gas cooling system of the present embodiment.
  • FIG. 1 is a schematic configuration diagram showing a combined cycle plant to which the fuel gas cooling system of the present embodiment is applied.
  • the combined cycle plant 10 includes a gas turbine 11, an exhaust heat recovery boiler (HRSG) 12, a steam turbine 13, and a generator 14.
  • the combined cycle plant 10 has a single-shaft type in which the rotating shaft of the gas turbine 11 and the rotating shaft of the steam turbine 13 are arranged in a straight line, and a generator 14 is connected to the rotating shaft.
  • the combined cycle plant 10 is not limited to the single-shaft type, and the rotating shaft of the gas turbine 11 and the rotating shaft of the steam turbine 13 may be arranged separately.
  • the gas turbine 11 includes a compressor 21, a combustor 22, and a turbine 23, and the compressor 21 and the turbine 23 are coupled to each other by a rotor (rotary shaft) 24 so as to be integrally rotatable.
  • the compressor 21 compresses the air A taken in from the air intake line L1 through the air intake port, and a filter 25 is provided in the air intake line L1.
  • the combustor 22 mixes and combusts the compressed air AC supplied from the compressor 21 through the compressed air supply line L2 and the fuel gas F (compressed fuel gas FC) supplied from the fuel gas supply line L3. is there.
  • the turbine 23 is rotationally driven by the combustion gas FG supplied from the combustor 22 through the combustion gas supply line L4.
  • the exhaust heat recovery boiler 12 generates steam (superheated steam) S by exhaust heat of the exhaust gas EG discharged from the gas turbine 11 (turbine 23) via the exhaust gas discharge line L5.
  • the exhaust heat recovery boiler 12 includes a superheater, an evaporator, and a economizer as a heat exchanger.
  • the exhaust heat recovery boiler 12 generates steam S by performing heat recovery in the order of the superheater, the evaporator, and the economizer when the exhaust gas EG from the gas turbine 11 passes through the inside.
  • the exhaust heat recovery boiler 12 is connected to the chimney 26 via an exhaust gas discharge line L6 that discharges the used exhaust gas EG that has generated the steam S.
  • the steam turbine 13 is driven by the steam S generated by the exhaust heat recovery boiler 12.
  • the steam turbine 13 has a turbine 27, and a rotating shaft 28 is connected to the rotor 24 of the gas turbine 11 in a straight line.
  • the steam supply line L7 which supplies the superheated steam of the superheater of the exhaust heat recovery boiler 12 to the turbine 27 is provided, and the used steam S which has driven the turbine 27 is returned to the reheater of the exhaust heat recovery boiler 12.
  • a steam recovery line L8 is provided, and a condenser 29 and a condensate pump 30 are provided in the steam recovery line L8.
  • the condenser 29 cools the steam S discharged from the turbine 27 with cooling water (for example, seawater) to form condensed water W.
  • the gas turbine 11 compresses a blast furnace gas (BFG) discharged from a blast furnace (not shown) as a fuel gas F and then supplies the compressed gas to the combustor 22.
  • a gas compressor 31 that compresses BFG as the fuel gas F is an axial compressor, has a turbine 32, and a driven gear 34 is fixed to an end of a rotating shaft 33.
  • a driving gear 35 is fixed to the end of the rotating shaft 28, and the driving gear 35 is meshed with the driven gear 34. Therefore, when the turbine 27 of the steam turbine 13 is driven, the rotational force is transmitted from the rotary shaft 28 to the rotary shaft 33 via the drive gear 35 and the driven gear 34, and the turbine 32 of the gas compressor 31 is driven to rotate.
  • a fuel gas supply line L11 to which BFG as the fuel gas F is supplied is connected to a gas intake port.
  • the fuel gas supply line L11 is provided with an on-off valve 36 and an electric dust collector (wet or dry type) 37.
  • the electric dust collector 37 collects and removes foreign matters such as dust contained in the fuel gas F.
  • the fuel gas supply line L3 is provided with a fuel gas return line L12 that returns a part of the compressed fuel gas FC compressed by the gas compressor 31 to the fuel gas supply line L11 as surplus gas.
  • the fuel gas return line L12 has one end connected to the fuel gas supply line L3 and the other end connected between the on-off valve 36 and the electric dust collector 37 in the fuel gas supply line L11.
  • the fuel gas return line L12 is provided with a bypass valve 38 and a gas cooler 39.
  • the gas cooler 39 cools a part of the compressed fuel gas FC as surplus gas by bringing it into contact with cooling water.
  • the cooling water pit 40 is disposed below the gas cooler 39, and a cooling water supply line L13 and a cooling water discharge line L14 are provided between the gas cooler 39 and the cooling water pit 40.
  • the cooling water supply line L13 is provided with a cooling water supply pump 41. By driving the cooling water supply pump 41, the cooling water in the cooling water pit 40 is supplied from the cooling water supply line L13 to the gas cooler 39 and compressed.
  • the fuel gas FC is cooled by spraying cooling water.
  • the cooling water that has cooled the compressed fuel gas FC is returned to the cooling water pit 40 from the cooling water discharge line L14 by its own weight.
  • the BFG as the fuel gas F is compressed by the electric dust collector 37 after the foreign matter such as dust contained in the fuel gas F is removed and then compressed by the gas compressor 31.
  • FC is supplied to the combustor 22.
  • the compressed fuel gas FC is partially cooled as surplus gas by the gas cooler 39 and then returned to the fuel gas supply line L11.
  • the compressor 21 compresses the air A, and the combustor 22 mixes the supplied compressed air AC and the compressed fuel gas FC and combusts them.
  • the gas compressor 31 compresses BFG as the fuel gas F into a compressed fuel gas FC and supplies the compressed fuel gas FC to the combustor 22.
  • the turbine 23 is rotationally driven by the combustion gas FG supplied from the combustor 22. Further, the exhaust gas EG discharged from the gas turbine 11 (turbine 23) is sent to the exhaust heat recovery boiler 12, and the exhaust heat recovery boiler 12 generates steam (superheated steam) S, and the steam S is sent to the steam turbine 13. It is done.
  • the turbine 27 is rotationally driven by the steam S.
  • the generator 14 generates power when the rotor 24 and the rotating shaft 28 are driven and rotated by the gas turbine 11 and the steam turbine 13.
  • FIG. 2 is a schematic configuration diagram showing the fuel gas cooling system of the present embodiment.
  • the fuel gas cooling system cools the compressed fuel gas FC supplied to the combustor 22 of the gas turbine 11 as the fuel gas.
  • the gas cooler 39 includes a housing 51, a header 52, a spray nozzle 53, and a hopper 54.
  • the housing 51 has a hollow shape, a gas introduction part 61 is provided in the lower part, and a gas discharge part 62 is provided in the upper part. Further, the housing 51 is provided with a first guide member 63 continuous with the gas introduction portion 61 inside, and with a second guide member 64 facing the upper side of the first guide member 63, thereby providing a gas introduction portion.
  • a bent passage 65 is provided between 61 and the gas discharge part 62.
  • the header 52 is disposed above the housing 51 and is connected to the downstream end of the cooling water supply line L13.
  • a plurality of spray nozzles 53 are arranged in the bent passage 65 in the housing 51, and a cooling water line L ⁇ b> 21 from the header 52 is connected to the spray nozzle 53.
  • the hopper 54 is disposed below the header 52 and around the gas introduction part 61, and the cooling water CW sprayed from the plurality of spray nozzles 53 is temporarily stored.
  • the hopper 54 communicates with an upstream end portion of a cooling water discharge line (discharge path) L14 at a lower portion.
  • the cooling water pit (cooling water storage part) 40 is disposed below the gas cooler 39 and can store a predetermined amount of cooling water CW.
  • the cooling water pit 40 is composed of a liquid phase part 71 and a gas phase part (inert gas storage part) 72.
  • the cooling water CW is stored in the liquid phase part 71, and the inert gas (for example, nitrogen) N is filled.
  • the upstream end portion of the cooling water supply line L13 communicates with the liquid phase portion 71, and the downstream end portion of the cooling water discharge line L14 communicates with the liquid phase portion 71.
  • the cooling water supply line L13 is provided with a cooling water supply pump 41.
  • the cooling water pit 40 is provided with an inert gas supply line L22 for supplying the inert gas N to the liquid phase portion 71 to publish. Therefore, the cooling water pit 40 is maintained at a positive pressure in which the gas phase portion 72 is higher in pressure than the atmosphere. Further, the cooling water pit 40 is provided with a gas discharge line L23 that discharges carbon monoxide CO that is dissolved in the cooling water CW of the liquid phase portion 71 and reaches the gas phase portion 72.
  • the cooling water discharge line L14 is provided with a siphon part 81 in the middle, and a gas line (communication path) L24 communicates with the siphon part 81.
  • This siphon part 81 and the gas line L24 constitute a siphon break part. Even if the cooling water supply pump 41 is stopped and the supply of the cooling water CW to the gas cooler 39 is stopped, the siphon break unit stops the discharge of the cooling water CW from the gas cooler 39, and the gas cooler 39 By securing a predetermined amount of cooling water CW in the hopper 54, the high temperature of the gas cooler 39 due to the compressed fuel gas FC is suppressed.
  • the siphon part 81 has a first vertical part 82, a second vertical part 83, and a horizontal part 84 that connects the first vertical part 82 and the second vertical part 83.
  • the first vertical part 82 and the second vertical part 83 may be inclined parts.
  • the horizontal portion 84 is set so that the position in the vertical direction becomes the upper limit level of the cooling water CW stored in the hopper 54 of the gas cooler 39.
  • one end of the gas line L24 is communicated with the upper part of the horizontal part 84, and the other end of the gas line L24 is communicated with the gas phase part 72 of the cooling water pit 40.
  • the horizontal portion 84 is a pipe constituting a part of the gas line L24.
  • the gas line L24 is connected to the upper part of the pipe, and the lower part of the pipe is stored in the hopper 54 of the gas cooler 39. It becomes the upper limit level of water CW.
  • the compressed fuel gas FC is supplied to the gas cooler 39 by the fuel gas return line L12, while the cooling water CW is supplied from the cooling water supply pump 41. Is supplied from the cooling water pit 40 to the gas cooler 39 through the cooling water supply line L13.
  • the compressed fuel gas FC flows from the gas introduction part 61 through the bent passage 65 to the gas discharge part 62, and the cooling water CW is sprayed onto the bent passage 65 by the spray nozzle 53. FC contacts the cooling water CW and is cooled.
  • the cooled compressed fuel gas FC flows from the fuel gas return line L12 to the fuel gas supply line L11, is mixed in the fuel gas F, and flows to the electric dust collector 37.
  • the cooling water CW that has cooled the compressed fuel gas FC is temporarily stored in the hopper 54 and then returned to the cooling water pit 40 by the cooling water discharge line L14 due to its own weight.
  • the cooling water supply pump 41 When the cooling water supply pump 41 is stopped during the operation of the gas cooler 39, the supply of the cooling water CW from the cooling water pit 40 to the gas cooler 39 through the cooling water supply line L13 is stopped. Then, since the cooling water CW stored in the hopper 54 is continuously returned to the cooling water pit 40 by the cooling water discharge line L14, the gas cooler 39 stores the cooling water CW stored in the hopper 54. The amount is reduced. When the amount of the coolant CW stored in the hopper 54 falls below the lower limit level, the inert gas N in the coolant pit 40 is supplied to the horizontal portion 84 of the siphon portion 81 through the gas line L24. The discharge of the cooling water CW from the hopper 54 through the cooling water discharge line L14 is stopped, and a predetermined amount of cooling water is secured in the hopper 54 of the gas cooler 39.
  • the inert gas N supplied to the siphon unit 81 may enter the gas cooler 39 through the cooling water discharge line L14 and be mixed into the compressed fuel gas FC.
  • the compressed fuel gas FC containing the inert gas N in the gas cooler 39 passes through the electrostatic precipitator 37, and thereafter, the combustor of the gas turbine 11 Even if supplied to 22, the electrostatic precipitator 37 and the combustor 22 are not adversely affected.
  • FIG. 3 is a schematic configuration diagram showing a modification of the fuel gas cooling system of the present embodiment.
  • the fuel gas supply line L11 is provided with an electric dust collector 37.
  • the electric dust collector 37 is configured by arranging a dust collecting electrode 94 in a housing 93 having an inlet 91 and an outlet 92.
  • the electrostatic precipitator 37 is provided with a plurality of cleaning water jet nozzles 95 for removing foreign substances adhering to the dust collecting electrode 94 above the dust collecting electrode 94.
  • the cleaning water pit 96 is disposed below the electric dust collector 37, and a cleaning water supply line L 31 and a cleaning water discharge line L 32 are provided between the electric dust collector 37 and the cleaning water pit 96.
  • the cleaning water supply line L31 is provided with a cleaning water supply pump 97, and by driving the cleaning water supply pump 97, the cleaning water in the cleaning water pit 96 is supplied from the cleaning water supply line L31 to the injection nozzle 95, and is collected by dust.
  • the electrode 94 is cleaned by spraying cleaning water.
  • the cleaning water that has cleaned the dust collecting electrode 94 is returned to the cleaning water pit 96 from the cleaning water discharge line L32 by its own weight.
  • the cleaning water pit (cooling water storage unit) 96 can store a predetermined amount of cleaning water WW.
  • the cleaning water pit 96 is composed of a liquid phase part 101 and a gas phase part (inert gas storage part) 102, the cooling water WW is stored in the liquid phase part 101, and an inert gas (for example, nitrogen) N is filled.
  • an inert gas For example, nitrogen
  • the cleaning water pit 96 is provided with an inert gas supply line L33 that supplies the liquid phase portion 101 with the inert gas N to publish.
  • the upstream end portion of the cleaning water supply line L31 communicates with the liquid phase portion 101, and the downstream end portion of the cleaning water discharge line L32 communicates with the liquid phase portion 101.
  • the cooling water discharge line L14 from the gas cooler 39 see FIG.
  • the inert gas N in the dust collecting electrode 94 cleaning water pit 96 is supplied to the siphon unit 81 through the gas line L24. Is done. Then, the discharge of the cooling water CW from the gas cooler 39 through the cooling water discharge line L14 is stopped by the siphon break effect, and a predetermined amount of cooling water is secured in the gas cooler 39. At this time, the inert gas N supplied to the siphon unit 81 enters the gas cooler 39 through the cooling water discharge line L14. However, since the inert gas N does not contain air, the electrostatic precipitator 37 and the combustion The vessel 22 is not adversely affected.
  • the gas cooler 39 that cools the fuel gas (compressed fuel gas FC) by bringing the coolant CW into contact therewith, and the cooling that is stored in the gas cooler 39.
  • a gas line L24 having a portion communicating with the siphon portion 81 and the other end communicating with the gas phase portion 72 is provided.
  • the siphon part 81 is communicated with the gas phase part 72 of the cooling water pit 40 by the gas line L24, oxygen in the air does not enter the gas cooler 39 and is not mixed into the fuel gas. Thus, reliability can be improved and reliability can be improved.
  • the gas phase portion 72 of the cooling water pit 40 serving as an inert gas reservoir is maintained at a positive pressure higher than the atmospheric pressure. Therefore, when the supply of the cooling water CW to the gas cooler 39 is stopped and the storage amount of the cooling water CW in the hopper 54 of the gas cooler 39 is reduced, the inert gas N in the gas phase portion 72 is removed from the gas line L24. It is possible to appropriately supply the siphon unit 81 and stop the discharge of the cooling water CW from the gas cooler 39.
  • the gas phase portion 72 of the cooling water pit 40 storing the cooling water CW discharged by the cooling water discharge line L14 is filled with the inert gas N, or the electric dust collector 37 Since the gas phase portion of the cooling water pit is filled with the inert gas N and the other end portion of the gas line L24 whose one end portion communicates with the siphon portion 81 is communicated with the gas phase portion 72 of the cooling water pit 40. There is no need to provide an inert gas reservoir, and the increase in size of the facility can be suppressed.
  • the gas turbine 11 having the compressor 21, the combustor 22, and the turbine 23, and the fuel that cools the fuel gas (compressed fuel gas FC) supplied to the combustor 22. And a gas cooling system.
  • the fuel gas is cooled by contact with the cooling water CW by the gas cooler 39, supplied to the combustor 22 of the gas turbine 11 through the fuel gas supply line L3, and combusted.
  • the cooling water CW that has cooled the fuel gas is stored in the hopper 54 of the gas cooler 39 and then discharged from the cooling water discharge line L14.
  • the siphon part 81 is communicated with the gas phase part 72 of the cooling water pit 40 by the gas line L24, oxygen in the air does not enter the gas cooler 39 and mix into the fuel gas.
  • the fuel gas does not adversely affect the electrostatic precipitator 37 and the combustor 22 arranged in the fuel gas supply line L3, and safety can be ensured and reliability can be improved.
  • the other end portion of the gas line L24 whose one end portion communicates with the siphon portion 81 is connected to the gas phase portion 72 of the cooling water pit 40 in the gas cooler 39 or the cooling water pit in the electric dust collector 37.
  • a dedicated inert gas storage unit that communicates with the other end of the gas line L24 that communicates with the siphon unit 81 may be provided separately.
  • the fuel gas cooling system of the present invention has been described as compressing blast furnace gas (BFG) as fuel gas, but may be applied to other fuel gas cooling systems. .
  • gas turbine plant of this invention was applied to the combined cycle plant 10 and demonstrated in embodiment mentioned above, it is good also as a gas turbine plant which does not have the waste heat recovery boiler 12 and the steam turbine 13, and has the gas turbine 11.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Feeding And Controlling Fuel (AREA)

Abstract

L'invention concerne un système de refroidissement de gaz combustible et une installation de turbine à gaz comprenant : un refroidisseur de gaz (39) qui effectue un refroidissement en amenant de l'eau de refroidissement (CW) à entrer en contact avec du gaz combustible comprimé (FC) servant de gaz combustible ; une conduite d'évacuation d'eau de refroidissement (L14) qui évacue l'eau de refroidissement (CW) qui a été collectée dans le refroidisseur de gaz (39) ; une partie siphon (81) disposée dans la conduite d'évacuation d'eau de refroidissement (L14) ; une partie de phase gazeuse (72) d'une fosse d'eau de refroidissement (40), servant de partie de collecte de gaz inerte pour collecter un gaz inerte ; et une conduite de gaz (L24) dont une partie d'extrémité communique avec la partie siphon (81) et une autre partie d'extrémité communique avec la partie de phase gazeuse (72).
PCT/JP2019/005937 2018-03-30 2019-02-18 Système de refroidissement de gaz combustible et installation de turbine à gaz WO2019187782A1 (fr)

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CN201980021471.1A CN111902620B (zh) 2018-03-30 2019-02-18 气体燃料的冷却系统及燃气涡轮机设备
KR1020207027654A KR102380316B1 (ko) 2018-03-30 2019-02-18 연료 가스의 냉각 시스템 및 가스 터빈 플랜트

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CN111902620B (zh) 2023-04-28
CN111902620A (zh) 2020-11-06
KR20200121890A (ko) 2020-10-26
KR102380316B1 (ko) 2022-03-29
JP6941580B2 (ja) 2021-09-29
JP2019178624A (ja) 2019-10-17

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