CN110199100B - Natural gas combined cycle power generation system and natural gas combined cycle power generation method - Google Patents
Natural gas combined cycle power generation system and natural gas combined cycle power generation method Download PDFInfo
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- CN110199100B CN110199100B CN201780084337.7A CN201780084337A CN110199100B CN 110199100 B CN110199100 B CN 110199100B CN 201780084337 A CN201780084337 A CN 201780084337A CN 110199100 B CN110199100 B CN 110199100B
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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
- 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
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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
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
- F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
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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
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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
- 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
- F02C7/141—Cooling of plants of fluids in the plant, e.g. lubricant or fuel of working fluid
- F02C7/143—Cooling of plants of fluids in the plant, e.g. lubricant or fuel of working fluid before or between the compressor stages
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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
- 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
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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
- 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
- F02C7/224—Heating fuel before feeding to the burner
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
- F17C7/02—Discharging liquefied gases
- F17C7/04—Discharging liquefied gases with change of state, e.g. vaporisation
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- 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
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- 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
- F23R3/30—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply comprising fuel prevapourising devices
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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]
Abstract
A natural gas combined cycle power generation system is provided with a gasifier, a cooler, a circulation flow path, a pump, and a gas turbine combined power generation device, wherein the gasifier comprises: an intermediate medium evaporation unit for evaporating at least a part of the intermediate medium by heat exchange between the intermediate medium having a freezing point lower than that of water and water flowing out of the cooler; and a liquid natural gas vaporizing unit for vaporizing at least a part of the liquefied natural gas by heat exchange between the intermediate medium and the liquefied natural gas.
Description
Technical Field
The invention relates to a natural gas combined cycle power generation system.
Background
Conventionally, in a vaporizer for vaporizing Liquefied Natural Gas (LNG), a natural gas combined cycle power generation system is known in which cold heat energy (cold heat energy) recovered from the liquefied natural gas is used to cool air supplied to a gas turbine combined power generation apparatus.
For example, patent document 1 discloses an LNG combined cycle power plant including an LNG vaporizer, a gas turbine intake air cooler, a gas turbine intake air cooling water circulation path, a gas turbine intake air cooling water circulation pump, and a gas turbine power generation device. The LNG vaporizer includes a heat transfer pipe for flowing LNG. In this LNG vaporizer, LNG is vaporized by heat exchange between the LNG flowing through the heat transfer tubes and water contacting the surfaces of the heat transfer tubes. The gas turbine intake air cooler cools air by exchanging heat between air and water (cooling water) flowing out of the LNG vaporizer. The gas turbine intake cooling water circulation path connects the LNG vaporizer and the gas turbine intake cooler. Water circulates through the gas turbine intake air cooling water circulation path, and flows through the LNG vaporizer and the gas turbine intake air cooler in this order. The gas turbine intake cooling water circulation pump is provided at a portion of the gas turbine intake cooling water circulation path on the downstream side of the gas turbine intake cooler. The gas turbine power generator includes a gas turbine compressor that compresses air flowing out of a cooler, a gas turbine that is driven by a mixed gas of air discharged from the gas turbine compressor and a combustion gas of Natural Gas (NG), and a power generator connected to the gas turbine. In this plant, air supplied to a gas turbine compressor of a gas turbine power generation apparatus is cooled by using cold and heat energy recovered from LNG by water in an LNG vaporizer.
In the vaporizer of the LNG combined cycle power generation facility described in patent document 1, there is a case where ice is formed on the surface of the heat transfer pipe through which LNG flows.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. H06-213001
Disclosure of Invention
The invention aims to provide a natural gas combined cycle power generation system and a natural gas combined cycle power generation method which can inhibit the occurrence of icing in a gasifier.
A natural gas combined cycle power generation system according to an aspect of the present invention includes: a vaporizer for vaporizing at least a portion of the natural liquefied gas by heating the liquefied natural gas with water; a cooler for cooling air by heat exchange between water flowing out of the vaporizer and the air; a circulation flow path connecting the vaporizer and the cooler to each other so that water flows in the order of the vaporizer and the cooler; a pump provided in the circulation flow path; and a gas turbine combined power generation device having a gas turbine driven by a gas containing air flowing out from the cooler and a gas turbine generator connected to the gas turbine, wherein the gasifier includes: an intermediate medium evaporation unit that evaporates at least a part of the intermediate medium by heat-exchanging the intermediate medium having a freezing point lower than that of water with the water flowing out of the cooler; and a liquefied natural gas vaporizing unit configured to vaporize at least a part of the liquefied natural gas by heat exchange between the intermediate medium and the liquefied natural gas.
A natural gas combined cycle power generation method according to another aspect of the present invention is a natural gas combined cycle power generation method for cooling air supplied to a gas turbine combined power generation apparatus including a gas turbine and a gas turbine power generator connected to the gas turbine, the natural gas combined cycle power generation method including the steps of: a gasification step of gasifying at least a part of the liquefied natural gas by heating the liquefied natural gas with water; and a cooling step of cooling air supplied to the gas turbine combined power generation plant using cold and heat energy recovered from the liquefied natural gas in the gasification step, wherein in the gasification step, the following operations are performed in the gasifier: supplying heat recovered from the air by cooling the air in the cooling step to an intermediate medium, thereby evaporating at least a portion of the intermediate medium, the freezing point of the intermediate medium being lower than that of water; and heating the liquefied natural gas using the intermediate medium, thereby vaporizing at least a portion of the liquefied natural gas.
Drawings
Fig. 1 is a diagram showing an outline of a configuration of a natural gas combined cycle power generation system according to a first embodiment of the present invention.
Fig. 2 is an enlarged view of the periphery of the vaporizer and the heater according to the first embodiment.
Fig. 3 is a diagram showing a modification of the natural gas combined cycle power generation system shown in fig. 1.
Fig. 4 is a diagram showing an outline of the configuration of a natural gas combined cycle power generation system according to a second embodiment of the present invention.
Fig. 5 is an enlarged view of the periphery of the vaporizer and the heater according to the second embodiment.
Detailed Description
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
(first embodiment)
A natural gas combined cycle power generation system 1 according to a first embodiment of the present invention is described with reference to fig. 1 and 2. The natural gas combined cycle power generation system 1 is a power generation system in which cold heat energy recovered from liquefied natural gas by water in a vaporizer 10 for vaporizing Liquefied Natural Gas (LNG) is used to cool air supplied to a gas turbine combined power generation apparatus 50, and power is generated by the gas turbine combined power generation apparatus 50. Specifically, the natural gas combined cycle power generation system 1 includes a gasifier 10, a cooler 20, a circulation flow path 30, a pump 40, and a gas turbine combined power generation device 50. The circulation flow path 30 connects the vaporizer 10 and the cooler 20 in this order.
The vaporizer 10 is an intermediate medium type vaporizer (IFV) that vaporizes liquefied natural gas by exchanging heat between water and liquefied natural gas through an intermediate medium (propane or the like) having a freezing point lower than that of water. That is, in the vaporizer 10, the intermediate medium is heated not by brine or the like but by water, and the liquefied natural gas is heated by the intermediate medium. Details of the gasifier 10 will be described later.
The cooler 20 cools the air by heat-exchanging the water flowing out from the gasifier 10 with the air.
The pump 40 is provided in the circulation flow path 30 at a position downstream of the vaporizer 10. The pump 40 delivers the water (cooling water) flowing out of the gasifier 10 to the cooler 20. In the present embodiment, a pump 41 is further provided in a portion of the circulation flow path 30 on the downstream side of the cooler 20. The pump 41 delivers the water (warm water) discharged from the cooler 20 to the vaporizer 10. Further, a cooling/heating energy storage tank 42 having a function of storing cooling/heating energy may be provided in the circulation flow path 30 at a position between the vaporizer 10 and the pump 40. Similarly, a heat storage tank 43 having a function of storing heat may be provided in the circulation flow path 30 at a position between the cooler 20 and the pump 41. Further, a backup heater 44 for heating water by a heat source (sea water or the like) may be provided in a portion of the circulation flow path 30 between the cooler 20 and the warm heat storage tank 43.
The gas turbine combined power generation apparatus 50 includes an air compressor 51, a gas turbine 52, an exhaust heat recovery boiler 53, a steam turbine 54, and a gas turbine generator 55. The air compressor 51 compresses air flowing out of the cooler 20. The gas turbine 52 is driven by a mixed gas of compressed air discharged from the air compressor 51 and combustion gas generated by combustion of Natural Gas (NG). The exhaust heat recovery boiler 53 evaporates water by exchanging heat between exhaust gas discharged from the gas turbine 52 and water. The steam turbine 54 is driven by the steam flowing out of the exhaust heat recovery boiler 53. The gas turbine generator 55 is connected to the gas turbine 52 and the steam turbine 54, and generates electric power by rotation thereof.
The natural gas combined cycle power generation system 1 may further have a heater 60 disposed in a portion between the cooler 20 and the gasifier 10 in the circulation flow path 30.
Here, the vaporizer 10 and the heater 60 will be described with reference to fig. 2.
The vaporizer 10 includes an intermediate medium evaporation unit E1, a liquefied natural gas vaporization unit E2, and a casing 11 capable of accommodating the intermediate medium evaporation unit E1, the liquefied natural gas vaporization unit E2, and the intermediate medium M.
The intermediate medium evaporator E1 evaporates at least a part of the liquid-phase intermediate medium M by exchanging heat between the intermediate medium M and water (warm water) flowing out of the cooler 20. In the present embodiment, the intermediate medium evaporation portion E1 is formed of a heat transfer pipe. The intermediate medium evaporator E1 is disposed at a lower portion in the casing 11 (a position immersed in the liquid-phase intermediate medium M in the casing 11). That is, the intermediate medium M contacting the intermediate medium evaporation unit E1 is heated by the water flowing through the intermediate medium evaporation unit E1.
The lng vaporization section E2 vaporizes at least a part of the lng by heat exchange between the lng and the intermediate medium M in the gas phase. In the present embodiment, the lng vaporization section E2 is formed of a heat transfer pipe having a U-shape. The liquefied natural gas vaporizer E2 is disposed in an upper portion of the casing 11 (a region above the surface of the liquid-phase intermediate medium M in the casing 11). That is, the lng flowing through the lng vaporizer E2 is heated by the intermediate medium M in the gas phase contacting the surface of the lng vaporizer E2.
An inlet chamber 12 and an outlet chamber 13 partitioned from each other by a partition plate 14 are connected to the housing 11. The inlet chamber 12 is connected to one end of the lng vaporizer E2 so that the inside of the inlet chamber 12 communicates with the inside of the lng vaporizer E2. The outlet chamber 13 is connected to the other end of the lng vaporizer E2 so that the inside of the outlet chamber 13 communicates with the inside of the lng vaporizer E2. That is, the lng flowing from the inlet chamber 12 into the lng vaporization section E2 is heated by the intermediate medium M in a gas phase while passing through the lng vaporization section E2, so that at least a portion thereof is vaporized and flows into the outlet chamber 13.
Further, a water inlet chamber 15 and a water outlet chamber 16 are connected to the housing 11. The water inlet chamber 15 is connected to one side of the housing 11 so that the inside of the water inlet chamber 15 communicates with the inside of the intermediate medium evaporation portion E1. The water outlet chamber 16 is connected to the other side of the housing 11 so that the inside of the water outlet chamber 16 communicates with the inside of the intermediate medium evaporation portion E1. That is, the water flowing into the intermediate medium evaporation unit E1 from the water inlet chamber 15 recovers cooling and heating energy from the liquid-phase intermediate medium M while passing through the intermediate medium evaporation unit E1, and flows out to the circulation flow path 30 through the water outlet chamber 16.
The heater 60 is provided in the circulation flow path 30 at a position upstream of the vaporizer 10. The warmer 60 heats the natural gas flowing from the gasifier 10. Warmer 60 has warming section E3 and case 61 for accommodating warming section E3.
The warming section E3 warms the natural gas flowing out of the lng vaporization section E2 by exchanging heat with the water flowing out of the cooler 20. In the present embodiment, the heating portion E3 is formed by a heat transfer pipe having a U shape.
An inlet chamber 62 and an outlet chamber 63 partitioned from each other by a partition plate 64 are connected to the housing 61 via a flange 65. The inlet chamber 62 and the outlet chamber 63 have the same configuration as the inlet chamber 12 and the outlet chamber 13 connected to the housing 11. The natural gas flowing out of the outlet chamber 13 of the vaporizer 10 flows into the inlet chamber 62, is heated by the water in the casing 61 while passing through the heating unit E3, and flows into the outlet chamber 63. The flange 65 is detachably attached to the housing 61. That is, the heating unit E3, the inlet chamber 62, the outlet chamber 63, and the partition plate 64 are detachable from the housing 61.
As shown in fig. 1, the natural gas combined cycle power generation system 1 has a heat adjustment flow path 31. The heat control flow path 31 is connected to the circulation flow path 30 and bypasses the heater 60. Therefore, the water that has flowed out of the cooler 20 and passed through the warmer 60 and the water that has passed through the heat quantity adjustment flow path 31 flow into the intermediate medium evaporation unit E1.
As described above, in the natural gas combined cycle power generation system 1 of the present embodiment, since the heat exchange between water and liquefied natural gas is performed by the intermediate medium (such as propane) having a freezing point lower than that of water, the occurrence of freezing in the intermediate medium evaporation unit E1 is suppressed as compared with the case where the heat exchange between water and liquefied natural gas is performed directly. In addition, it is not necessary to use expensive brine (ethylene glycol water or the like) as a cooling and heating medium in order to prevent the problem of freezing.
Further, a heater 60 for heating the natural gas by the water flowing out from the cooler 20 is provided on the upstream side of the vaporizer 10. Therefore, the natural gas is heated with a simple configuration as compared with the case where the natural gas flowing out from the lng vaporizer E2 is heated with another heating medium other than the water flowing out from the cooler 20.
In the warmer 60, the warming section E3, the inlet chamber 62, the outlet chamber 63, and the partition plate 64 are detachable from the case 61. Therefore, cleaning (washing) of the heating portion E3 and the inside of the case 61 is facilitated.
As shown in fig. 3, the natural gas combined cycle power generation system 1 may further include a cooler bypass passage 32 and a cold-heat energy recovery unit 45. The cooler bypass flow path 32 is connected to the circulation flow path 30 and bypasses the cooler 20. The cold heat energy recovery unit 45 recovers cold heat energy of water flowing out of the vaporizer 10. The cold heat energy recovery unit 45 may be a cooling device in a cooling chamber or a cable well. In this embodiment, the remaining amount of the cooling heat energy required to cool the air in the cooler 20 is efficiently recovered by the cooling heat energy recovery unit 45.
(second embodiment)
Next, a natural gas combined cycle power generation system 1 according to a second embodiment of the present invention will be described with reference to fig. 4 and 5. In the second embodiment, only the portions different from the first embodiment will be described, and the description of the same configurations, operations, and effects as those of the first embodiment will be omitted.
The natural gas combined cycle power generation system 1 of the present embodiment further includes a direct expansion turbine 80, an expansion turbine generator 90, a warming-up unit bypass passage 33, and an additional warming-up unit E4.
The direct expansion turbine 80 is driven by the natural gas flowing out from the warming-up section E3. The expansion turbine generator 90 is connected to the direct expansion turbine 80.
The warming-up unit bypass passage 33 is connected to the circulation passage 30 and bypasses the warming-up unit E3.
The additional heating unit E4 is provided in the heating unit bypass flow path 33. The additional heating unit E4 heats the natural gas by exchanging heat between the water flowing through the heating unit bypass passage 33 and the natural gas flowing out of the direct expansion turbine 80. The additional heating portion E4 is formed of a heat transfer pipe having a U-shape. In the present embodiment, the additional heating unit E4 is housed in the case 61. In other words, the case 61 of the present embodiment has a shape that can accommodate the warming section E3 and the additional warming section E4 together. An inlet chamber 72 and an outlet chamber 73, which are partitioned from each other by a partition plate 74, are also connected to the housing 61 via a flange 75. The inlet chamber 72 and the outlet chamber 73 communicate with the inside of the additional heating unit E4. The natural gas flowing out of the direct expansion turbine 80 flows into the inlet chamber 72, is heated by the water flowing into the casing 61 through the heating unit bypass passage 33 while passing through the additional heating unit E4, and flows into the outlet chamber 73. The additional heating unit E4 can also be detached from the casing 61 together with the inlet chamber 72, the outlet chamber 73, and the partition plate 74. Therefore, cleaning (washing) of the additional heating portion E4 is also facilitated.
In the present embodiment, since the energy of the natural gas flowing out of the warming-up unit E3 is recovered as electric power in the expansion turbine generator 90, the amount of power generation of the entire system increases.
Further, the temperature of the natural gas decreased by the direct expansion turbine 80 can be increased by the water flowing out of the cooler 20 without using a dedicated heating medium for heating the natural gas flowing out of the direct expansion turbine 80. Specifically, although the temperature of the natural gas is lowered by the direct expansion turbine 80, a part of the heat of the water flowing out of the cooler 20 is input to the additional heating unit E4 through the heating unit bypass passage 33 instead of being input to the heating unit E3, and therefore the temperature of the natural gas flowing out of the direct expansion turbine 80 is effectively raised. Since the water has sufficient heat after the natural gas is warmed in the additional warming section E4, the intermediate medium M is effectively warmed in the intermediate medium evaporating section E1 by the water.
The embodiments disclosed herein are illustrative in all respects and should not be considered as limiting. The scope of the present invention is defined by the claims rather than the description of the embodiments, and includes meanings equivalent to the claims and all modifications within the scope.
For example, the warming section E3 and the additional warming section E4 may be housed in different cases. At this time, the water flowing out of the additional heating section E4 is also preferably supplied to the intermediate medium evaporation section E1.
Here, the embodiments are described in general.
The natural gas combined cycle power generation system of the embodiment includes: a vaporizer for vaporizing at least a portion of the natural liquefied gas by heating the liquefied natural gas with water; a cooler for cooling air by heat exchange between water flowing out of the vaporizer and the air; a circulation flow path connecting the vaporizer and the cooler to each other so that water flows in the order of the vaporizer and the cooler; a pump provided in the circulation flow path; and a gas turbine combined power generation device having a gas turbine driven by a gas containing air flowing out from the cooler and a gas turbine generator connected to the gas turbine, wherein the gasifier includes: an intermediate medium evaporation unit that evaporates at least a part of the intermediate medium by heat-exchanging the intermediate medium having a freezing point lower than that of water with the water flowing out of the cooler; and a liquefied natural gas vaporizing unit configured to vaporize at least a part of the liquefied natural gas by heat exchange between the intermediate medium and the liquefied natural gas.
In the natural gas combined cycle power generation system, since the water and the liquefied natural gas exchange heat with each other through the intermediate medium (such as propane) having a freezing point lower than that of water, the occurrence of freezing in the intermediate medium evaporation unit is suppressed.
Further, in the natural gas combined cycle power generation system, it is preferable that: and a heating unit provided in the circulation flow path between the cooler and the vaporizer, the heating unit heating the natural gas by exchanging heat between the natural gas flowing out of the liquefied natural gas vaporizer and water flowing out of the cooler.
This simplifies the configuration compared to the case where the natural gas flowing out of the liquefied natural gas vaporizing unit is heated by a heating medium other than the water flowing out of the cooler.
Further, in the natural gas combined cycle power generation system, it is preferable that: a direct expansion turbine driven by the natural gas flowing out from the warming-up unit; and an expansion turbine generator connected to the direct expansion turbine.
Accordingly, the energy of the natural gas flowing out of the heating unit is recovered as electric power in the expansion turbine generator, and therefore the amount of power generation of the entire system increases.
Further, in the natural gas combined cycle power generation system, it is preferable that: a heating part bypass flow path which is connected to the circulation flow path and bypasses the heating part; and an additional heating unit for heating the natural gas by heat exchange between the water flowing through the bypass passage of the heating unit and the natural gas flowing out of the direct expansion turbine.
Thus, the temperature of the natural gas decreased by the direct expansion turbine can be increased by the water flowing out of the cooler without using a dedicated heating medium for heating the natural gas flowing out of the direct expansion turbine. Specifically, the temperature of the natural gas is lowered by the direct expansion turbine, but the natural gas flowing out of the direct expansion turbine is efficiently heated because a part of the heat of the water flowing out of the cooler is input to the additional heating unit through the heating unit bypass passage instead of being input to the heating unit. Further, since the water has sufficient heat after the natural gas is heated in the additional heating unit, the intermediate medium is effectively heated in the intermediate medium evaporation unit by the water.
Further, in the natural gas combined cycle power generation system, it is preferable that: and a case for accommodating the heating part and the additional heating part together.
Thus, the heating unit and the additional heating unit have a simpler structure and are smaller in size than a case where the heating unit and the additional heating unit are housed in separate cases.
Preferably, the heating unit is detachably mounted to the housing.
This facilitates cleaning (washing) of the heating unit and the inside of the casing.
In the natural gas combined cycle power generation system, it is preferable that the additional heating unit is detachably provided to the casing.
This makes it easy to add a heating unit and clean (wash) the inside of the case.
Further, in the natural gas combined cycle power generation system, it is preferable that: a cooler bypass flow path connected to the circulation flow path and bypassing the cooler; and a cold-heat energy recovery unit provided in the cooler bypass flow path.
Thus, the residual amount of the cooling energy required to cool the air in the cooler is efficiently recovered in the cooling energy recovery unit.
In addition, the natural gas combined cycle power generation method of the embodiment uses the cold and hot energy recovered from the natural liquefied gas in the vaporizer for vaporizing the liquefied natural gas for cooling the air supplied to the gas turbine combined power generation apparatus having the gas turbine and the gas turbine power generator connected to the gas turbine, and includes the steps of: a gasification step of gasifying at least a part of the liquefied natural gas by heating the liquefied natural gas with water; and a cooling step of cooling air supplied to the gas turbine combined power generation plant using cold and heat energy recovered from the liquefied natural gas in the gasification step, wherein in the gasification step, the following operations are performed in the gasifier: supplying heat recovered from the air by cooling the air in the cooling step to an intermediate medium, thereby evaporating at least a portion of the intermediate medium, the freezing point of the intermediate medium being lower than that of water; and heating the liquefied natural gas using the intermediate medium, thereby vaporizing at least a portion of the liquefied natural gas.
In the gasification step of the natural gas combined cycle power generation method, since the liquefied natural gas is gasified in the gasifier by an intermediate medium (propane or the like) having a freezing point lower than that of water, the occurrence of freezing in the gasifier is suppressed.
Claims (8)
1. A natural gas combined cycle power generation system, comprising:
a vaporizer for vaporizing at least a portion of the liquefied natural gas by heating the liquefied natural gas with water;
a cooler for cooling air by heat exchange between water flowing out of the vaporizer and the air;
a circulation flow path connecting the vaporizer and the cooler to each other so that water flows in the order of the vaporizer and the cooler;
a pump provided in the circulation flow path;
a gas turbine combined power generation device having a gas turbine driven by a gas containing air flowing out from the cooler and a gas turbine generator connected to the gas turbine;
a heating unit provided in the circulation flow path at a position between the cooler and the vaporizer; and
a heat adjustment flow path connected to the circulation flow path so that water flowing out of the cooler and flowing to the vaporizer bypasses the heating unit,
the gasifier has:
an intermediate medium evaporation unit that evaporates at least a part of the intermediate medium by exchanging heat between the intermediate medium having a freezing point lower than that of water and the water flowing out of the heating unit and the water flowing out of the heat control flow path; and
a liquefied natural gas vaporizing unit for vaporizing at least a part of the liquefied natural gas by heat exchange between the intermediate medium and the liquefied natural gas,
the heating unit heats the natural gas flowing out of the liquefied natural gas vaporizing unit so that the natural gas having a higher temperature than the natural gas flows out by exchanging heat between the natural gas and water having a higher temperature than the natural gas and flowing out of the cooler,
the heat adjustment flow path is directly connected to the intermediate medium evaporation unit.
2. The natural gas combined cycle power generation system of claim 1, further comprising:
a direct expansion turbine driven by the natural gas flowing out from the warming-up unit; and
an expansion turbine generator connected to the direct expansion turbine.
3. A natural gas combined cycle power generation system, comprising:
a vaporizer for vaporizing at least a portion of the liquefied natural gas by heating the liquefied natural gas with water;
a cooler for cooling air by heat exchange between water flowing out of the vaporizer and the air;
a circulation flow path connecting the vaporizer and the cooler to each other so that water flows in the order of the vaporizer and the cooler;
a pump provided in the circulation flow path;
a gas turbine combined power generation device having a gas turbine driven by a gas containing air flowing out from the cooler and a gas turbine generator connected to the gas turbine;
a heating unit provided in the circulation flow path at a position between the cooler and the vaporizer;
a direct expansion turbine driven by the natural gas flowing out from the warming-up unit;
an expansion turbine generator connected to the direct expansion turbine;
a heating part bypass flow path which is connected to the circulation flow path and bypasses the heating part; and
an additional heating unit for heating the natural gas by heat exchange between the water flowing through the bypass passage of the heating unit and the natural gas flowing out of the direct expansion turbine,
the gasifier has:
an intermediate medium evaporation unit that evaporates at least a part of the intermediate medium by heat-exchanging the intermediate medium having a freezing point lower than that of water with the water flowing out of the cooler; and
a liquefied natural gas vaporizing unit for vaporizing at least a part of the liquefied natural gas by heat exchange between the intermediate medium and the liquefied natural gas,
the heating unit heats the natural gas by exchanging heat between the natural gas flowing out of the liquefied natural gas vaporizing unit and the water flowing out of the cooler.
4. The natural gas combined cycle power generation system of claim 3, further comprising:
and a case for accommodating the heating part and the additional heating part together.
5. The natural gas combined cycle power generation system of claim 4,
the heating unit is configured to be detachable from the housing.
6. The natural gas combined cycle power generation system of claim 4,
the additional heating unit is configured to be detachable from the housing.
7. A natural gas combined cycle power generation system according to any one of claims 1 to 6, characterized by further comprising:
a cooler bypass flow path connected to the circulation flow path and bypassing the cooler; and
and a cold heat energy recovery unit provided in the cooler bypass flow path.
8. A natural gas combined cycle power generation method for using cold and heat energy recovered from liquefied natural gas in a gasifier for gasifying liquefied natural gas for cooling air supplied to a gas turbine combined power generation unit having a gas turbine and a gas turbine power generator connected to the gas turbine, the natural gas combined cycle power generation method comprising the steps of:
a gasification step of gasifying at least a part of the liquefied natural gas by heating the liquefied natural gas with water;
a cooling step of cooling air supplied to the gas turbine combined power generation plant using cold and heat energy recovered from the liquefied natural gas in the gasification step; and
a heating step of heating the natural gas obtained in the gasification step so that the natural gas having a higher temperature than the natural gas flows out from the heating unit by heat exchange between the natural gas and a part of the water having a higher temperature than the natural gas and having cooled the air in the cooling step,
in the gasification step, the following operations are performed in the gasifier:
supplying heat recovered from the air by cooling the air in the cooling step to an intermediate medium, thereby evaporating at least a portion of the intermediate medium, the freezing point of the intermediate medium being lower than that of water; and
heating the liquefied natural gas using the intermediate medium, thereby vaporizing at least a portion of the liquefied natural gas,
the remaining part of the water after the air is cooled in the cooling step is allowed to flow into the vaporizer without passing through the warming part, and at least a part of the intermediate medium is evaporated by heat of the remaining part of the water.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017012868A JP6779146B2 (en) | 2017-01-27 | 2017-01-27 | Natural gas-fired combined cycle power generation system and natural gas-fired combined cycle power generation method |
| JP2017-012868 | 2017-01-27 | ||
| PCT/JP2017/046064 WO2018139131A1 (en) | 2017-01-27 | 2017-12-22 | Natural gas fired combined-cycle power generation system and natural gas fired combined-cycle power generation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110199100A CN110199100A (en) | 2019-09-03 |
| CN110199100B true CN110199100B (en) | 2022-06-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201780084337.7A Active CN110199100B (en) | 2017-01-27 | 2017-12-22 | Natural gas combined cycle power generation system and natural gas combined cycle power generation method |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JP6779146B2 (en) |
| KR (1) | KR102234807B1 (en) |
| CN (1) | CN110199100B (en) |
| PH (1) | PH12019501630A1 (en) |
| SG (1) | SG11201906369WA (en) |
| WO (1) | WO2018139131A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6916061B2 (en) * | 2017-08-10 | 2021-08-11 | 株式会社Ｉｈｉプラント | Heat exchange system |
| JP7467028B2 (en) * | 2018-10-29 | 2024-04-15 | 株式会社神戸製鋼所 | Low-temperature liquefied gas vaporizer, cooling system, and method for suppressing ice formation in the vaporizer |
| JP6767546B1 (en) * | 2019-07-02 | 2020-10-14 | 株式会社神戸製鋼所 | Liquefied natural gas vaporizer and cold water supply method |
| KR102271761B1 (en) * | 2020-02-07 | 2021-07-02 | 대우조선해양 주식회사 | Liquefied Gas Regasification System and Method for Vessel |
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| JPS59188005A (en) * | 1984-03-30 | 1984-10-25 | Hitachi Ltd | Power plant using refrigeration of liquefied natural gas |
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- 2017-01-27 JP JP2017012868A patent/JP6779146B2/en active Active
- 2017-12-22 KR KR1020197023102A patent/KR102234807B1/en active IP Right Grant
- 2017-12-22 SG SG11201906369WA patent/SG11201906369WA/en unknown
- 2017-12-22 CN CN201780084337.7A patent/CN110199100B/en active Active
- 2017-12-22 WO PCT/JP2017/046064 patent/WO2018139131A1/en active Application Filing
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- 2019-07-12 PH PH12019501630A patent/PH12019501630A1/en unknown
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| CN1150995A (en) * | 1995-06-23 | 1997-06-04 | 三菱重工业株式会社 | Liquefied natural gas gasification device for gas turbine compound circulating power plant |
| JPH10288047A (en) * | 1997-04-16 | 1998-10-27 | Osaka Gas Co Ltd | Liquefied natural gas evaporating power generating device |
| JPH11270347A (en) * | 1998-03-23 | 1999-10-05 | Kawasaki Steel Corp | Gas turbine combined generating set using lng |
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Also Published As
| Publication number | Publication date |
|---|---|
| SG11201906369WA (en) | 2019-08-27 |
| KR102234807B1 (en) | 2021-04-01 |
| WO2018139131A1 (en) | 2018-08-02 |
| JP2018119511A (en) | 2018-08-02 |
| KR20190100391A (en) | 2019-08-28 |
| PH12019501630A1 (en) | 2020-03-09 |
| JP6779146B2 (en) | 2020-11-04 |
| CN110199100A (en) | 2019-09-03 |
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