WO2022044875A1 - Système de récupération d'énergie motrice, et structure flottante portée par l'eau - Google Patents

Système de récupération d'énergie motrice, et structure flottante portée par l'eau Download PDF

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Publication number
WO2022044875A1
WO2022044875A1 PCT/JP2021/029980 JP2021029980W WO2022044875A1 WO 2022044875 A1 WO2022044875 A1 WO 2022044875A1 JP 2021029980 W JP2021029980 W JP 2021029980W WO 2022044875 A1 WO2022044875 A1 WO 2022044875A1
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WIPO (PCT)
Prior art keywords
gas
turbine
recovery system
power recovery
heat medium
Prior art date
Application number
PCT/JP2021/029980
Other languages
English (en)
Japanese (ja)
Inventor
亮 ▲高▼田
英司 齋藤
直希 西尾
Original Assignee
三菱重工マリンマシナリ株式会社
Priority date (The priority date 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 date listed.)
Filing date
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Application filed by 三菱重工マリンマシナリ株式会社 filed Critical 三菱重工マリンマシナリ株式会社
Priority to CN202180052108.3A priority Critical patent/CN115917122A/zh
Priority to KR1020237005859A priority patent/KR20230042071A/ko
Publication of WO2022044875A1 publication Critical patent/WO2022044875A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H21/00—Use of propulsion power plant or units on vessels
    • B63H21/38—Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/44—Free-space packings
    • F16J15/447—Labyrinth packings

Definitions

  • the present disclosure relates to a power recovery system for recovering power from liquefied gas and a floating structure on water including the power recovery system.
  • Liquefied gas for example, liquefied natural gas
  • a supply destination such as city gas or thermal power plant
  • a heat medium such as seawater.
  • power is consumed to drive the pump for the liquefied gas, the pump for seawater, etc., so the cold energy of the liquefied gas may be recovered instead of being discarded in the seawater.
  • Patent Document 1 There is (for example, Patent Document 1).
  • Patent Document 1 discloses a cryogenic power generation cycle that recovers the cold energy of liquefied natural gas (LNG) as electric power, and an LNG turbine that is driven by natural gas obtained by heating liquefied natural gas after boosting it with a pump. ing.
  • LNG liquefied natural gas
  • a secondary medium circulating in a closed loop is heated by an evaporator using seawater as a heat source to evaporate, and this steam is introduced into a turbine for thermal power generation to obtain power and then liquefied. It is designed to be cooled and condensed with natural gas.
  • the LNG turbine disclosed in Patent Document 1 uses natural gas obtained by heating liquefied natural gas after boosting it with a pump as a working fluid, it is necessary to suppress leakage of high-pressure and low-temperature natural gas to the outside of the LNG turbine. There is.
  • a high-performance seal such as an expensive mechanical seal or a seal having a complicated structure for the shaft seal seal portion of the LNG turbine, the sealing property of the shaft seal seal portion can be ensured.
  • the structure of the LNG turbine may become complicated or expensive. The complication of the structure of the LNG turbine may lead to a decrease in reliability of the LNG turbine and an increase in maintenance cost. Therefore, suppressing the complexity and cost increase of the structure of the LNG turbine has become an issue in realizing the LNG turbine.
  • an object of at least one embodiment of the present disclosure is to suppress gas leakage of a turbine driven by a gas vaporized from liquefied gas, while suppressing complication and cost increase of the structure of the turbine. It is an object of the present invention to provide a power recovery system and a floating structure on water equipped with the power recovery system.
  • the power recovery system is A power recovery system that recovers power from liquefied gas supplied from a liquefied gas storage device that stores liquefied gas.
  • a first turbine driven by a gas vaporized from the liquefied gas supplied from the liquefied gas storage device, and a first turbine.
  • a first leaked gas introduction pipe for guiding the gas leaked from the shaft seal seal portion of the first turbine, and A gas combustion device for burning the gas guided by the first leaked gas introduction pipe is provided.
  • the floating structure on the water according to the embodiment of the present disclosure is equipped with the power recovery system.
  • a power recovery system and a power recovery system capable of suppressing gas leakage of a turbine driven by a gas vaporized from liquefied gas while suppressing complication and cost increase of the structure of the turbine.
  • a floating structure on the water with a recovery system is provided.
  • expressions such as “same”, “equal”, and “homogeneous” that indicate that things are in the same state not only represent exactly the same state, but also have tolerances or differences to the extent that the same function can be obtained. It shall also represent the existing state.
  • the expression representing a shape such as a quadrangular shape or a cylindrical shape not only represents a shape such as a quadrangular shape or a cylindrical shape in a geometrically strict sense, but also an uneven portion or a chamfer within the range where the same effect can be obtained. It shall also represent the shape including the part and the like.
  • the expression “includes”, “includes”, or “has” one component is not an exclusive expression that excludes the existence of another component.
  • the same reference numerals may be given to the same configurations, and the description thereof may be omitted.
  • FIG. 1 is a schematic configuration diagram schematically showing the configuration of a floating structure on water equipped with a power recovery system according to an embodiment of the present disclosure.
  • the power recovery system 1 according to some embodiments recovers power from the liquefied gas supplied from the liquefied gas storage device (liquefied gas tank in the illustrated example) 31 for storing the liquefied gas. Is.
  • the power recovery system 1 may recover power from the vaporized gas of the liquefied gas.
  • the power recovery system 1 includes at least a first turbine 2 driven by a gas vaporized from the liquefied gas supplied from the liquefied gas storage device 31.
  • the power recovery system 1 is included in the power plant 10.
  • the power plant 10 includes a liquefied gas supply system 3, a heat medium circulation cycle 4, and a gas combustion system 5.
  • the power plant 10 including the power recovery system 1 is mounted on the floating structure 100.
  • the floating structure 100 on water is a structure that can float on water.
  • the floating structure 100 has a propulsion device configured to drive a propulsion device such as a propeller, and a self-propelled ship 100A by driving the propulsion device and a floating body 100B having no propulsion device. Is included.
  • at least a part of the power plant 10 including the power recovery system 1 may be installed on land.
  • the liquefied gas supply system 3 includes the above-mentioned liquefied gas storage device 31 and a liquefied gas supply line for guiding the liquefied gas or the vaporized gas of the liquefied gas supplied from the liquefied gas storage device 31.
  • 32 includes a liquefied gas pump 33 provided in the liquefied gas supply line 32, and the above-mentioned first turbine 2 provided in the liquefied gas supply line 32.
  • the liquefied gas supply line 32 has a flow path through which a fluid (a liquefied gas or a gas obtained by vaporizing a liquefied gas) can flow.
  • a fluid a liquefied gas or a gas obtained by vaporizing a liquefied gas
  • One side of the liquefied gas supply line 32 is connected to the liquefied gas storage device 31, and the other side 322 is connected to the gas supply destination 34 in which the liquefied gas is vaporized.
  • the gas supply destination 34 may be provided inside or outside the power plant 10 (floating structure 100 on the water).
  • the liquefied gas stored in the liquefied gas storage device 31 is sent to the liquefied gas supply line 32, and the liquefied gas supply line 32 is moved from the upstream side (one side 321) to the downstream side (one side 321). It flows toward the other side 322).
  • the liquefied gas supply system 3 has a first heat exchanger 11 provided on the upstream side of the first turbine 2 of the liquefied gas supply line 32 and a first turbine of the liquefied gas supply line 32. Further includes a second heat exchanger 12 provided on the downstream side of 2.
  • the liquefied gas pump 33 is provided on the upstream side of the first heat exchanger 11 of the liquefied gas supply line 32.
  • the heat medium circulation cycle 4 includes a first heat medium circulation cycle 4A configured to circulate a first heat medium that exchanges heat with the liquefied gas supplied from the liquefied gas storage device 31.
  • the first heat medium circulation cycle 4A includes at least a first heat medium circulation line 41 for circulating the first heat medium.
  • the first heat medium circulation line 41 has a flow path through which a fluid (first heat medium) can flow.
  • liquefied natural gas LNG
  • propane propane as a specific example of the heat medium flowing through the heat medium circulation cycle 4 will be described.
  • a liquefied gas other than liquefied natural gas liquefied petroleum gas, liquid hydrogen, etc.
  • a heat medium other than propane can be used. It is also applicable when the heat medium flows through the heat medium circulation cycle 4.
  • the first heat exchanger 11 is configured to exchange heat between the liquefied gas flowing through the liquefied gas supply line 32 and the first heat medium flowing through the first heat medium circulation line 41.
  • the first heat exchanger 11 is provided in the first heat exchange unit 111 in which the liquefied gas flows, which is provided in the liquefied gas supply line 32, and in the first heat medium circulation line 41.
  • a second heat exchange unit 112 through which a first heat medium flows is included. The temperature of the first heat medium flowing through the second heat exchange unit 112 is higher than that of the liquefied gas flowing through the first heat exchange unit 111.
  • Heat exchange is performed between the first heat exchange unit 111 and the second heat exchange unit 112, the liquefied gas flowing through the first heat exchange unit 111 is heated, and the first heat medium flowing through the second heat exchange unit 112 is heated. Is cooled.
  • the liquefied gas flowing through the liquefied gas supply line 32 is vaporized by being heated in the first heat exchange unit 111 of the first heat exchanger 11.
  • the first heat medium circulation cycle 4A is configured to circulate the first heat medium under the organic Rankine cycle.
  • the first heat medium circulation cycle 4A shares the liquefied gas supply system 3 and the first heat exchanger 11.
  • the first heat medium circulation cycle 4A includes the above-mentioned first heat medium circulation line 41, the above-mentioned first heat exchanger 11, and the second heat exchange unit 112 (first heat) of the first heat medium circulation line 41.
  • a turbine 7A for the first heat medium provided downstream of the third heat exchanger 43 of the first heat medium circulation line 41.
  • the third heat exchanger 43 is configured to exchange heat between the first heat medium flowing through the first heat medium circulation line 41 and seawater.
  • the third heat exchanger 43 may be configured to indirectly exchange heat between the first heat medium and seawater via an intermediate heat medium.
  • the third heat exchanger 43 is provided with the first heat medium side heat exchange unit 431 provided in the first heat medium circulation line 41 through which the first heat medium flows, and the power plant 10. Includes a seawater side heat exchange unit 432 through which seawater acquired externally flows.
  • the temperature of the first heat medium flowing through the first heat medium side heat exchange unit 431 is lower than that of the seawater flowing through the seawater side heat exchange unit 432. Heat exchange is performed between the first heat medium side heat exchange unit 431 and the seawater side heat exchange unit 432, and the first heat medium flowing through the first heat medium side heat exchange unit 431 is heated.
  • the turbine 7A for the first heat medium includes a rotary shaft 71A, a turbine blade 72A attached to the rotary shaft 71A, and a casing 73A that rotatably accommodates the rotary shaft 71A and the turbine blade 72A. And a shaft sealing portion 74A for sealing between the rotary shaft 71A and the casing 73A. At least one side of the rotary shaft 71A in the axial direction protrudes to the outside of the casing 73A.
  • the casing 73A has a first heat medium introduction port 75A for introducing the first heat medium inside the casing 73A, and a first heat medium for discharging the first heat medium that has passed through the turbine blades 72A to the outside of the casing 73A.
  • a heat medium discharge port 76A is formed.
  • the turbine 7A for the first heat medium is configured to use the first heat medium as a working fluid and to be driven by the working fluid.
  • the first heat medium which is boosted by the circulation pump 42 and heated by the third heat exchanger 43 (first heat medium side heat exchange unit 431), is sent to the turbine 7A for the first heat medium.
  • the turbine blade 72A is rotated by the energy of the first heat medium introduced into the casing 73A through the first heat medium introduction port 75A.
  • the first heat medium that has passed through the turbine blades 72A is discharged to the outside of the casing 73A through the first heat medium discharge port 76A.
  • the power recovery system 1 is configured to recover the rotational force of the turbine blade 72A as power.
  • the power recovery system 1 further comprises a generator 44 for a first heat medium configured to generate electricity by driving a turbine 7A.
  • the generator 44 is mechanically connected to the rotary shaft 71A and is configured to convert the rotational force of the turbine blades 72A into electric power.
  • the power recovery system 1 does not convert the rotational force of the turbine blade 72A into electric power, but uses a power transmission device (for example, a coupling, a belt, a pulley, etc.) as power as it is. You may collect it.
  • the first turbine 2 includes a rotary shaft 21, a turbine blade 22 attached to the rotary shaft 21, a casing 23 that rotatably accommodates the rotary shaft 21 and the turbine blade 22, and a rotary shaft.
  • the casing 23 has a gas introduction port 25 for introducing the vaporized gas of the liquefied gas supplied from the liquefied gas storage device 31 into the casing 23, and the gas that has passed through the turbine blades 22 is discharged to the outside of the casing 23.
  • a gas discharge port 26 for the purpose is formed.
  • the first turbine 2 is configured to use a gas obtained by vaporizing liquefied gas as a working fluid and drive it by the working fluid.
  • the gas boosted by the liquefied gas pump 33 and vaporized by the first heat exchanger 11 is sent to the first turbine 2.
  • the turbine blade 22 is rotated by the energy of the gas introduced into the casing 23 through the gas introduction port 25.
  • the gas that has passed through the turbine blades 22 is discharged to the outside of the casing 23 through the gas discharge port 26.
  • the power recovery system 1 is configured to recover the rotational force of the turbine blade 22 as power.
  • the power recovery system 1 further comprises a generator 13 configured to generate electricity by driving a first turbine 2.
  • the generator 13 is mechanically connected to the rotary shaft 21 and is configured to convert the rotational force of the turbine blades 22 into electric power.
  • the power recovery system 1 does not convert the rotational force of the turbine blade 22 into electric power, but uses a power transmission device (for example, a coupling, a belt, a pulley, etc.) as power as it is. You may collect it.
  • the temperature of the gas discharged from the first turbine 2 has dropped by passing through the first turbine 2.
  • the second heat exchanger 12 is configured to exchange heat between the gas discharged from the first turbine 2 and a heat medium having a temperature higher than that of the gas.
  • a third heat exchange unit 121 and a third heat exchange unit 121 which are provided on the downstream side of the first turbine 2 on the liquefied gas supply line 32 and through which a gas vaporized from the liquefied gas flows, are provided.
  • a fourth heat exchange unit 122 through which a heat medium having a temperature higher than that of the gas flowing through the heat exchange unit 122, is included.
  • the heat medium exchanged by the second heat exchanger 12 (fourth heat exchange unit 122) is made of seawater. Heat exchange is performed between the third heat exchange unit 121 and the fourth heat exchange unit 122, and the gas flowing through the third heat exchange unit 121 is heated. The heated gas heated in the second heat exchanger 12 is sent to the gas supply destination 34.
  • the power recovery system 1 includes the above-mentioned first turbine 2 and the first turbine 2 driven by the vaporized gas of the liquefied gas supplied from the liquefied gas storage device 31.
  • the device 51 is provided.
  • the gas combustion device 51 was introduced from a gas introduction port 52 for introducing gas fuel, an air introduction port 53 for introducing air, and a gas fuel and air introduction port 53 introduced from the gas introduction port 52. It has a combustion unit 54 configured to burn air, and an exhaust gas discharge port 55 for discharging the exhaust gas generated by combustion in the combustion unit 54 to the outside of the gas combustion device 51.
  • the one side 141 of the first leak gas introduction pipe 14 is arranged at a position outside the shaft seal seal portion 24 of the first turbine 2 and adjacent to the shaft seal seal portion 24, and the first leak occurs.
  • the other side 142 of the gas introduction pipe 14 is connected to the gas introduction port 52 for introducing the gas fuel of the gas combustion device 51.
  • the first leaked gas is guided from one side 141 of the first leaked gas introduction pipe 14 to the inside of the first leaked gas introduction pipe 14, and the first leaked gas introduction pipe 14 is introduced from one side 141 to the other. After flowing toward the side 142, it is guided to the combustion unit 54 of the gas combustion device 51 through the gas introduction port 52. The first leaked gas guided to the combustion unit 54 is burned in the combustion unit 54.
  • the power recovery system 1 further includes a blower 15 attached in the middle of the first leak gas introduction pipe 14.
  • the blower 15 has an impeller (not shown), and is configured to send the first leaked gas from one side 141 of the first leaked gas introduction pipe 14 to the other side 142 by the rotational movement of the impeller.
  • the power recovery system 1 may suck the first leaked gas into the inside of the first leaked gas introduction pipe 14 by the suction force generated by the blower 15.
  • the above-mentioned "position adjacent to the shaft seal seal portion 24" includes a position where the first leaked gas can be sucked into the inside of the first leaked gas introduction pipe 14 by the suction force generated by the blower 15. Is done.
  • the power recovery system 1 guides the gas (first leaked gas) leaked from the shaft sealing portion 24 of the first turbine 2 to the gas combustion device 51 through the first leaked gas introduction pipe 14.
  • the gas combustion device 51 can perform combustion processing.
  • the power recovery system 1 can suppress the outflow of the first leaked gas into the atmosphere by combusting the first leaked gas with the gas combustion device 51. Therefore, the power recovery system 1 can suppress the leakage of gas from the first turbine 2 into the atmosphere without improving the sealing performance of the shaft seal sealing portion 24 of the first turbine 2 as in the conventional case.
  • the first leaked gas can be used as fuel for the gas combustion device 51 by combusting the first leaked gas with the gas combustion device 51.
  • the power recovery system 1 does not have to improve the sealing performance of the shaft sealing portion 24 of the first turbine 2 as in the conventional case, the shaft sealing of the first turbine 2 is sealed.
  • the structure of the portion 24 can be simplified as compared with the conventional one. As a result, the structure of the first turbine 2 can be suppressed from becoming complicated and expensive, and the power recovery system 1 can be suppressed from becoming expensive.
  • FIG. 2 is a schematic configuration diagram schematically showing the configuration of a floating structure on water equipped with a power recovery system according to an embodiment of the present disclosure.
  • the power recovery system 1 described above further provides a boil-off gas introduction pipe 16 for guiding the boil-off gas vaporized in the liquefied gas storage device 31 to the gas combustion device 51, as shown in FIG. Be prepared.
  • one side 161 of the boil-off gas introduction pipe 16 is connected to the liquefied gas storage device 31, and the other side 162 of the boil-off gas introduction pipe 16 joins the first leaked gas introduction pipe 14. .. Since the boil-off gas vaporized by the liquefied gas storage device 31 is in a state of being pressurized by the liquefied gas storage device 31, it flows to the downstream side (gas combustion device 51 side) by its own pressure.
  • the boil-off gas is guided from one side 161 of the boil-off gas introduction pipe 16 to the inside of the boil-off gas introduction pipe 16 and flows from one side 161 of the boil-off gas introduction pipe 16 toward the other side 162, and then the gas introduction port 52. It is guided to the combustion unit 54 of the gas combustion device 51 through.
  • the boil-off gas guided to the combustion unit 54 is burned in the combustion unit 54.
  • the power recovery system 1 can guide the boil-off gas vaporized in the liquefied gas storage device 31 to the gas combustion device 51 through the boil-off gas introduction pipe 16 and perform combustion processing in the gas combustion device 51. .. Therefore, the power recovery system 1 can use the boil-off gas as fuel for the gas combustion device 51 by combusting the boil-off gas with the gas combustion device 51.
  • the power recovery system 1 can burn the first leaked gas and the boil-off gas by the shared gas combustion device 51. By sharing the gas combustion device 51, the power recovery system 1 can suppress the increase in size and cost of the power recovery system 1.
  • the boil-off gas introduction pipe 16 described above has one side 161 connected to the liquefied gas storage device 31 and the other side 162 joining the first leak gas introduction pipe 14. is doing.
  • the power recovery system 1 has a common portion 144 on the downstream side of the confluence portion 143 of the first leak gas introduction pipe 14 with the boil-off gas introduction pipe 16, and the first leak through the common portion 144.
  • Gas or boil-off gas can be guided to the gas combustion device 51.
  • the gas combustion device 51 does not have to provide the gas introduction port 52 for introducing the gas individually for each of the first leaked gas and the boil-off gas, so that the structure of the gas combustion device 51 It is possible to suppress the complication and the increase in price.
  • the boil-off gas introduction pipe 16 may have the other side 162 connected to a gas introduction port for boil-off gas provided in the gas combustion device 51.
  • FIG. 3 is a schematic configuration diagram schematically showing the configuration of a floating structure on water equipped with a power recovery system according to an embodiment of the present disclosure.
  • the power recovery system 1 described above comprises a first compressor 56 configured to compress air and compressed air compressed by the first compressor 56. Is branched from the first compressed air introduction pipe 57 for introducing the gas into the gas combustion device 51 and the first compressed air introduction pipe 57, and a part of the compressed air is guided to the shaft sealing portion 24 of the first turbine 2.
  • a first compressed air supply pipe 17 is further provided.
  • first compressed air introduction pipe 57 In the first compressed air introduction pipe 57, one side 572 is connected to the first compressor 56, and the other side 571 is connected to the air introduction port 53 of the gas combustion device 51.
  • One side 171 of the first compressed air supply pipe 17 is a branch portion 573 provided on the downstream side (gas introduction port 52 side) of the first compressor 56 in the first compressed air introduction pipe 57, and is the first compressed air. It is connected to the introduction pipe 57.
  • the gas combustion system 5 includes the gas combustion device 51 described above, the first compressor 56 described above, the first compressed air introduction pipe 57 described above, and the exhaust gas discharged from the gas combustion device 51.
  • the exhaust gas introduction pipe 59 for introducing the gas into the exhaust gas turbine 58, and the exhaust gas turbine 58 configured to be driven by the exhaust gas introduced by the exhaust gas introduction pipe 59.
  • the first compressor 56 includes a compressor (turbocharger compressor) 56A having a rotor mechanically connected to the drive shaft of the exhaust gas turbine 58, and an electric compressor 56B. In some other embodiments, the first compressor 56 may include only one of the compressor 56A and the electric compressor 56B.
  • the power recovery system 1 guides a part of the compressed air compressed by the first compressor 56 to the shaft sealing portion 24 of the first turbine 2 through the first compressed air supply pipe 17. By using it as an air seal, leakage of gas (first leaked gas) from the shaft sealing portion 24 of the first turbine 2 can be suppressed. Further, the power recovery system 1 can guide the first leaked gas to the gas combustion device 51 in a state where the compressed air is premixed by using the compressed air compressed by the first compressor 56 as an air seal. Therefore, the combustion efficiency in the gas combustion device 51 can be improved.
  • FIG. 4 is a schematic cross-sectional view schematically showing a cross section along the axis of the rotary shaft of the first turbine according to the embodiment of the present disclosure.
  • the shaft seal seal portion 24 of the first turbine 2 described above is located between the rotary shaft 21 of the first turbine 2 and the casing 23 of the first turbine 2. It includes a downstream side sealing portion 24B for sealing and an upstream side sealing portion 24A for sealing between the rotary shaft 21 and the casing 23 on the upstream side of the downstream side sealing portion 24B.
  • the first compressed air supply pipe 17 communicates with the space 231 formed between the downstream side sealing portion 24B and the upstream side sealing portion 24A.
  • the "upstream side” is based on the direction in which the first leaked gas leaks.
  • the one side is the upstream side and the other side is the downstream side.
  • the casing 23 has an upstream first annular portion 232 whose inner peripheral side is sealed by the upstream sealing portion 24A and a downstream second annular portion whose inner peripheral side is sealed by the downstream sealing portion 24B.
  • 233 includes an annular axial extending portion 234 extending from the first annular portion 232 to the other side (downstream side) of the rotary shaft 21 in the axial direction and connected to the second annular portion 233.
  • the above-mentioned space 231 is formed on the inner peripheral side of the axial extending portion 234.
  • the casing 23 is formed with a through hole 235 that penetrates the axially extending portion 234 so as to communicate inside and outside, and the first compressed air supply pipe 17 described above is formed in the through hole 235 from the outer peripheral side.
  • the other side of 172 is connected. Since the compressed air flowing through the first compressed air introduction pipe 57 is in a state of being pressurized by the first compressor 56, a part of the compressed air flows to the downstream side (space 231 side) due to its own pressure. .. A part of the compressed air flowing through the first compressed air introduction pipe 57 is guided from one side 171 of the first compressed air supply pipe 17 to the inside of the first compressed air supply pipe 17, and is led to the inside of the first compressed air supply pipe 17. After flowing from one side 171 toward the other side 172, it is guided to the space 231. By introducing the compressed air into the space 231, the fluid inside the space 231 (including the first leaked gas and the compressed air) is boosted.
  • a part of the compressed air compressed by the first compressor 56 is passed through the first compressed air supply pipe 17 to the downstream side sealing portion 24B and the upstream side of the first turbine 2. It can be guided to the space 231 formed between the seal portion 24A and the seal portion 24A.
  • the pressure difference between the upstream side of the upstream side sealing portion 24A and the downstream side of the upstream side sealing portion 24A (space 231) can be reduced as compared with the case where the compressed air is not introduced into the space 231. Therefore, it is possible to suppress the leakage of gas to the downstream side of the upstream side sealing portion 24A.
  • leakage of gas (first leaked gas) from the shaft sealing portion 24 of the first turbine 2 can be suppressed.
  • the above-mentioned upstream side seal portion 24A and the above-mentioned downstream side seal portion 24B are composed of a labyrinth seal 24C.
  • the first leaked gas is burned by the gas combustion device 51, so that the sealing performance of the shaft sealing portion 24 of the first turbine 2 is not improved as in the conventional case.
  • the labyrinth seal 24C for the seal in the shaft seal seal portion 24 (upstream side seal portion 24A and downstream side seal portion 24B) of the first turbine 2
  • the first turbine 2 can be brought into the atmosphere. Gas leakage can be sufficiently suppressed.
  • the labyrinth seal 24C which has a simple structure, for the seal in the shaft seal seal portion 24 of the first turbine 2, it is possible to suppress the complexity and cost increase of the structure of the first turbine 2, and by extension, the power recovery system 1. It is possible to suppress the increase in price.
  • FIG. 5 is an explanatory diagram for explaining the reheater according to the embodiment of the present disclosure.
  • the power recovery system 1 described above draws gas from the first turbine 2 and returns it to the downstream side of the gas extraction position P1 in the first turbine 2, as shown in FIG. It further comprises a trachea 61 and a reheater 62 configured to heat the gas flowing through the bleed air tube 61.
  • the gas extracted by the bleed pipe 61 is sent to the turbine blade 22 downstream of the bleed position P1.
  • the power recovery system 1 described above employs a reheat cycle.
  • the power recovery system 1 can suppress an increase in steam wetness at the end of expansion (near the final stage) in the first turbine 2 by heating the gas with the reheater 62, so that the steam wetness near the final stage can be suppressed. Corrosion of the turbine blade 22 can be suppressed, and the thermal efficiency of the first turbine 2 can be improved.
  • the above-mentioned reheater 62 is a heat medium (heat exchange between the gas flowing through the bleeding pipe 61 and the liquefied gas supplied from the liquefied gas storage device 31). It includes a heat exchanger 62A configured to exchange heat with (first heat medium).
  • the heat exchanger 62A has a fifth heat exchange unit 621 provided in the first heat medium circulation line 41 through which the first heat medium flows, and a sixth heat exchange unit provided in the air extraction tube 61. 622 and.
  • the temperature of the first heat medium flowing through the fifth heat exchange unit 621 is higher than that of the vaporized gas of the liquefied gas flowing through the sixth heat exchange unit 622.
  • Heat exchange is performed between the fifth heat exchange unit 621 and the sixth heat exchange unit 622, and the gas flowing through the sixth heat exchange unit 622 is heated.
  • the heat exchanger 62A is housed in the same casing as the first heat exchanger 11.
  • the heat exchanger 62A performs heat exchange between the gas (bleed air gas) extracted from the first turbine 2 and flowing through the bleed air pipe 61 and the first heat medium, and the bleed air gas is extracted. Is heated.
  • the structure of the heat exchanger 62A (reheater 62) can be simplified, and the first heat medium can be used as the heat source of the bleed air gas in the heat exchanger 62A.
  • the condensation in the condensation step of the first heat medium is promoted, so that the thermal efficiency of the second turbine 7 (turbine 7A) can be improved.
  • the reheater 62 may be a heater that heats the gas flowing through the bleeding pipe 61. Further, the reheater 62 is a heat exchanger configured to exchange heat between the gas flowing through the bleed air pipe 61 and seawater, or between the gas flowing through the bleed air pipe 61 and a second heat medium described later. It may be a heat exchanger configured to exchange heat.
  • FIG. 6 is an explanatory diagram for explaining the second heat medium circulation cycle.
  • the heat medium circulation cycle 4 is configured such that the above-mentioned first heat medium circulation cycle 4A and a heat medium (second heat medium) that exchanges heat with the gas discharged from the first turbine 2 circulate. Includes at least one of the heat medium circulation cycle 4B.
  • the second heat medium circulation cycle 4B is configured to circulate the second heat medium under the organic Rankine cycle.
  • the second heat medium circulation cycle 4B shares the liquefied gas supply system 3 and the second heat exchanger 12.
  • the second heat medium circulation cycle 4B includes a second heat medium circulation line 45 for circulating the second heat medium, the above-mentioned second heat exchanger 12, and a fourth heat exchange of the second heat medium circulation line 45.
  • the heat exchanger 47 of No. 4 and the turbine 7B for the second heat medium provided on the downstream side of the fourth heat exchanger 47 of the second heat medium circulation line 45 are provided.
  • the second heat medium circulation line 45 has a flow path through which a fluid (second heat medium) can flow.
  • the fourth heat exchanger 47 is configured to exchange heat between the second heat medium flowing through the second heat medium circulation line 45 and seawater.
  • the fourth heat exchanger 47 may be configured to indirectly exchange heat between the second heat medium and seawater via an intermediate heat medium.
  • the fourth heat exchanger 47 is the second heat medium side heat exchange unit 471 provided in the second heat medium circulation line 45 through which the second heat medium flows, and the power plant 10. Includes a seawater side heat exchange unit 472 through which seawater acquired externally flows.
  • the temperature of the second heat medium flowing through the second heat medium side heat exchange unit 471 is lower than that of the seawater flowing through the seawater side heat exchange unit 472. Heat exchange is performed between the second heat medium side heat exchange unit 471 and the seawater side heat exchange unit 472, and the second heat medium flowing through the second heat medium side heat exchange unit 471 is heated.
  • the second turbine 7 includes at least one of the above-mentioned turbine 7A for the first heat medium and the turbine 7B for the second heat medium.
  • the turbine 7B includes a rotary shaft 71B, a turbine blade 72B attached to the rotary shaft 71B, a casing 73B rotatably accommodating the rotary shaft 71B and the turbine blade 72B, and a rotary shaft 71B.
  • At least one side of the rotary shaft 71B in the axial direction protrudes to the outside of the casing 73B.
  • the casing 73B has a second heat medium introduction port 75B for introducing the second heat medium into the casing 73B and a second heat medium for discharging the second heat medium that has passed through the turbine blades 72B to the outside of the casing 73B.
  • a heat medium discharge port 76B is formed.
  • the turbine 7B for the second heat medium is configured to use the second heat medium as a working fluid and to be driven by the working fluid.
  • the second heat medium which is boosted by the circulation pump 46 and heated by the fourth heat exchanger 47 (second heat medium side heat exchange unit 471), is sent to the turbine 7B for the second heat medium.
  • the turbine blade 72B is rotated by the energy of the second heat medium introduced into the casing 73B through the second heat medium introduction port 75B.
  • the second heat medium that has passed through the turbine blades 72B is discharged to the outside of the casing 73B through the second heat medium discharge port 76B.
  • the power recovery system 1 is configured to recover the rotational force of the turbine blade 72B as power.
  • the power recovery system 1 further comprises a second heat medium generator 48 configured to generate electricity by driving the turbine 7B.
  • the generator 48 is mechanically connected to the rotary shaft 71B and is configured to convert the rotational force of the turbine blades 72B into electric power.
  • the power recovery system 1 does not convert the rotational force of the turbine blade 72B into electric power, but uses a power transmission device (for example, a coupling, a belt, a pulley, etc.) as power as it is. You may collect it.
  • the power recovery system 1 described above comprises liquefied gas supplied from the liquefied gas storage device 31 or gas and heat discharged from the first turbine 2 as shown in FIGS. 7 and 8.
  • a heat medium circulation cycle 4 configured to circulate the heat medium to be exchanged, the heat medium circulation cycle 4 including the second turbine 7 using the heat medium as the working fluid, and the shaft seal of the second turbine 7.
  • a second leaked gas introduction pipe 18 for guiding the working fluid leaked from the seal portions 74 (74A, 74B) to the gas combustion device 51 is further provided.
  • the heat medium circulation cycle 4 includes a first heat medium circulation cycle 4A including the above-mentioned turbine 7A.
  • the first heat medium is flammable.
  • the second leaked gas introduction pipe 18 is for the first heat medium for guiding the working fluid (first heat medium) leaked from the shaft sealing portion 74A of the turbine 7A for the first heat medium described above to the gas combustion device 51. Includes the leaked gas introduction pipe 18A.
  • one side 181 of the leaked gas introduction pipe 18A is arranged on the outside of the shaft seal seal portion 74A and at a position adjacent to the shaft seal seal portion 74A (74), and the leak gas introduction pipe 18A is arranged.
  • the other side 182 is connected to the upstream side (one side 141) of the blower 15 of the first leak gas introduction pipe 14.
  • the working fluid (first heat medium) leaked from the shaft seal seal portion 74A is guided to the combustion portion 54 through the leaked gas introduction pipe 18A, the first leaked gas introduction pipe 14, and the gas introduction port 52.
  • the flammable first heat medium guided to the combustion unit 54 is burned in the combustion unit 54.
  • the power recovery system 1 may suck the first heat medium leaked from the shaft seal seal portion 74A into the inside of the leaked gas introduction pipe 18A by the suction force generated by the blower 15.
  • the heat medium circulation cycle 4 includes a second heat medium circulation cycle 4B including the above-mentioned turbine 7B.
  • the second heat medium is flammable.
  • the heat medium exchanged by the second heat exchanger 12 (fourth heat exchange unit 122) described above is made of propane.
  • the second leaked gas introduction pipe 18 is for a second heat medium for guiding the working fluid (second heat medium) leaked from the shaft sealing portion 74B of the turbine 7B for the second heat medium described above to the gas combustion device 51. Includes the leaked gas introduction pipe 18B.
  • one side 183 of the leaked gas introduction pipe 18B is arranged on the outside of the shaft seal seal portion 74B and at a position adjacent to the shaft seal seal portion 74B (74), and the leak gas introduction pipe 18B is arranged.
  • the other side 184 is connected to the upstream side (one side 141) of the blower 15 of the first leak gas introduction pipe 14.
  • the working fluid (second heat medium) leaked from the shaft sealing portion 74B is guided to the combustion portion 54 through the leaked gas introduction pipe 18B, the first leaked gas introduction pipe 14, and the gas introduction port 52.
  • the flammable second heat medium guided to the combustion unit 54 is burned in the combustion unit 54.
  • the power recovery system 1 may suck the second heat medium leaked from the shaft seal seal portion 74B into the inside of the leaked gas introduction pipe 18B by the suction force generated by the blower 15.
  • a position where the leaked gas) can be sucked is included inside the second leaked gas introduction pipe 18 (18A, 18B).
  • the power recovery system 1 may include both the leaked gas introduction pipe 18A and the leaked gas introduction pipe 18B.
  • the power recovery system 1 gas leaks gas (second leaked gas) from the shaft sealing portion 74 of the second turbine 7 of the heat medium circulation cycle 4 through the second leaked gas introduction pipe 18. It can be guided to the combustion device 51 and burned by the gas combustion device 51.
  • the power recovery system 1 can suppress the outflow of the second leaked gas into the atmosphere by combusting the second leaked gas with the gas combustion device 51. Therefore, the power recovery system 1 can suppress the leakage of gas from the second turbine 7 into the atmosphere without improving the sealing performance of the shaft seal sealing portion 74 of the second turbine 7 as in the conventional case.
  • the second leaked gas can be used as fuel for the gas combustion device 51 by combusting the second leaked gas with the gas combustion device 51.
  • the power recovery system 1 does not have to improve the sealing performance of the shaft sealing portion 74 of the second turbine 7 as in the conventional case, so that the shaft sealing of the second turbine 7 does not have to be improved.
  • the structure of the portion 74 can be simplified as compared with the conventional one. As a result, the structure of the second turbine 7 can be suppressed from becoming complicated and expensive, and eventually the power recovery system 1 can be suppressed from becoming expensive.
  • the power recovery system 1 described above is compressed into a second compressor 81 configured to compress air and a second compressor 81, as shown in FIGS. 7 and 8.
  • a second compressed air introduction pipe 82 for introducing the compressed air into the gas combustion device 51, and a part of the compressed air branched from the second compressed air introduction pipe 82 and compressed into the second compressor 81 are second.
  • a second compressed air supply pipe 83 for guiding to the shaft seal seal portion 74 (74A, 74B) of the turbine 7 is provided.
  • the second compressor 81 is shared by the first compressor 56, and the second compressed air introduction pipe 82 is shared by the first compressed air introduction pipe 57. There is. In this case, since the number of compressors and compressed air introduction pipes can be reduced, it is possible to suppress the increase in size of the power recovery system 1.
  • the second compressor 81 and the second compressed air introduction pipe 82 may be separated from the first compressor 56 and the first compressed air introduction pipe 57.
  • the second compressed air supply pipe 83 is at a branch portion 821 provided on the downstream side (gas introduction port 52 side) of the second compressed air introduction pipe 82 with respect to the second compressor 81. 2 It is connected to the compressed air introduction pipe 82.
  • the second compressed air supply pipe 83 shares the upstream side of the confluence portion 831 with the first compressed air supply pipe 17 with the first compressed air supply pipe 17.
  • the second compressed air supply pipe 83 is configured to guide the compressed air to the shaft sealing portion 74A of the turbine 7A for the first heat medium, and the compressed air for the first heat medium is configured. Includes supply pipe 83A.
  • the compressed air guided to the shaft seal seal portion 74A through the compressed air supply pipe 83A (second compressed air supply pipe 83) is used as an air seal to generate the first heat from the shaft seal seal portion 74A. Leakage of the medium can be suppressed.
  • the second compressed air supply pipe 83 is configured to guide the compressed air to the shaft sealing portion 74B of the turbine 7B for the second heat medium.
  • the compressed air guided to the shaft seal seal portion 74B through the compressed air supply pipe 83B (second compressed air supply pipe 83) is used as an air seal to generate the second heat from the shaft seal seal portion 74B. Leakage of the medium can be suppressed.
  • the power recovery system 1 may include both the compressed air supply pipe 83A and the compressed air supply pipe 83B.
  • the power recovery system 1 guides a part of the compressed air compressed by the second compressor 81 to the shaft sealing portion 74 of the second turbine 7 through the second compressed air supply pipe 83. By using it as an air seal, leakage of gas (second leaked gas) from the shaft sealing portion 74 of the second turbine 7 can be suppressed. Further, the power recovery system 1 can guide the second leaked gas to the gas combustion device 51 in a state where the compressed air is premixed by using the compressed air compressed by the second compressor 81 as an air seal. Therefore, the combustion efficiency in the gas combustion device 51 can be improved.
  • the floating structure 100 on the water is equipped with the above-mentioned power recovery system 1 as shown in FIGS. 1 to 3 and 5 to 8.
  • the power recovery system 1 can suppress the gas leakage of the first turbine 2 driven by the vaporized gas of the liquefied gas, and at the same time, suppress the complication and the cost increase of the structure of the turbine first turbine 2. ..
  • the space occupied by the power recovery system 1 in the floating structure 100 can be reduced, so that the floating structure can be reduced in size. Effective utilization of 100 empty spaces can be achieved.
  • the present disclosure is not limited to the above-mentioned embodiment, and includes a form in which the above-mentioned embodiment is modified and a form in which these forms are appropriately combined.
  • the power recovery system (1) is It is a power recovery system (1) that recovers power from the liquefied gas supplied from the liquefied gas storage device (31) that stores the liquefied gas.
  • a first turbine (2) driven by a gas vaporized from the liquefied gas supplied from the liquefied gas storage device (31).
  • a gas combustion device (51) for burning the gas guided by the first leaked gas introduction pipe (14) is provided.
  • the power recovery system guides the gas leaked from the shaft seal portion of the first turbine (first leaked gas) to the gas combustion device through the first leaked gas introduction pipe, and the gas.
  • Combustion processing can be performed with a combustion device.
  • the power recovery system can suppress the outflow of the first leaked gas into the atmosphere by combusting the first leaked gas with a gas combustion device. Therefore, the power recovery system can suppress the leakage of gas from the first turbine to the atmosphere without improving the sealing performance of the shaft sealing portion of the first turbine as in the conventional case.
  • the first leaked gas can be used as fuel for the gas combustion device by combusting the first leaked gas with the gas combustion device.
  • the power recovery system does not have to improve the sealing performance of the shaft sealing portion of the first turbine as in the conventional case, so that the shaft sealing portion of the first turbine is used.
  • the structure can be simpler than before. As a result, the structure of the first turbine can be suppressed from becoming complicated and expensive, and eventually the power recovery system can be suppressed from becoming expensive.
  • a boil-off gas introduction pipe (16) for guiding the boil-off gas vaporized by the liquefied gas storage device (31) to the gas combustion device (51) is further provided.
  • the power recovery system can guide the boil-off gas vaporized in the liquefied gas storage device to the gas combustion device through the boil-off gas introduction pipe and perform combustion processing in the gas combustion device. Therefore, in the power recovery system, the boil-off gas can be used as fuel for the gas combustion device by combusting the boil-off gas with the gas combustion device.
  • the power recovery system can burn the first leaked gas and the boil-off gas by the shared gas combustion device.
  • the gas combustion device By sharing the gas combustion device in the power recovery system, it is possible to suppress the increase in size and cost of the power recovery system.
  • the power recovery system (1) described in 2) above is used.
  • One side (161) of the boil-off gas introduction pipe (16) is connected to the liquefied gas storage device (31), and the other side (162) joins the first leak gas introduction pipe (14).
  • the power recovery system has a shared portion on the downstream side of the confluence of the first leaked gas introduction pipe with the boil-off gas introduction pipe, and the first leaked gas and the boil-off gas pass through the shared portion.
  • a gas combustion device does not have to provide a gas introduction port for introducing the gas individually for each of the first leaked gas and the boil-off gas, so that the structure of the gas combustion device is complicated. And can suppress the increase in price.
  • the power recovery system (1) according to any one of 1) to 3) above.
  • a first compressor (56) configured to compress air
  • a first compressed air introduction pipe (57) for introducing compressed air compressed by the first compressor (56) into the gas combustion device (51), and
  • a first compressed air supply pipe (17) for branching from the first compressed air introduction pipe (57) and guiding a part of the compressed air to the shaft sealing portion (24) of the first turbine (2). And further prepare.
  • the power recovery system guides a part of the compressed air compressed by the first compressor to the shaft seal portion of the first turbine through the first compressed air supply pipe as an air seal. By using it, it is possible to suppress the leakage of gas (first leaked gas) from the shaft seal seal portion of the first turbine. Further, since the power recovery system uses the compressed air compressed by the first compressor as an air seal, the first leaked gas can be guided to the gas combustion device in a state where the compressed air is premixed. Combustion efficiency in a gas combustion device can be improved.
  • the shaft seal seal portion (24) of the first turbine (2) is A downstream sealing portion (24B) that seals between the rotary shaft (21) of the first turbine (2) and the casing (23) of the first turbine (2).
  • An upstream seal portion (24A) that seals between the rotary shaft (21) and the casing (23) on the upstream side of the downstream seal portion (24B) is included.
  • the first compressed air supply pipe communicates with a space (231) formed between the downstream side seal portion (24B) and the upstream side seal portion (24A).
  • a part of the compressed air compressed by the first compressor is passed through the first compressed air supply pipe to the downstream side seal portion and the upstream side seal portion of the first turbine. It can lead to the space formed between.
  • the pressure difference between the upstream side of the upstream seal portion and the downstream side of the upstream seal portion can be reduced as compared with the case where compressed air is not introduced into the space, so that the pressure difference is smaller than that of the upstream seal portion.
  • the power recovery system (1) according to 5) above.
  • the upstream side seal portion (24A) and the downstream side seal portion (24B) are made of a labyrinth seal (24C).
  • the first leaked gas is burned by the gas combustion device, so that the sealing property of the shaft sealing portion of the first turbine does not have to be improved as in the conventional case. 1 It is possible to suppress gas leakage from the turbine to the atmosphere.
  • the configuration of 6) above by using a labyrinth seal for the seal in the shaft seal seal portion (upstream side seal portion and downstream side seal portion) of the first turbine, gas leakage from the first turbine to the atmosphere is prevented. It can be sufficiently suppressed.
  • the power recovery system (1) according to any one of 1) to 6) above.
  • An bleed pipe (61) that draws the gas from the first turbine (2) and returns it to the downstream side of the bleed position (P1) of the gas in the first turbine (2). It further comprises a reheater (62) configured to heat the gas flowing through the bleed tube (61).
  • the power recovery system described above employs a reheat cycle.
  • the power recovery system can suppress the increase in steam wetness at the end of expansion (near the final stage) in the first turbine by heating the gas with a reheater, so that the turbine blade near the final stage can be suppressed. Corrosion can be suppressed and the thermal efficiency of the first turbine can be improved.
  • the reheater (62) has a heat medium (first heat medium) that exchanges heat with the gas flowing through the bleeding pipe (61) and the liquefied gas supplied from the liquefied gas storage device (31). Includes a heat exchanger (62A) configured to exchange heat between.
  • the heat exchanger performs heat exchange between the gas (bleed air gas) extracted from the first turbine and flowing through the bleed air pipe and the first heat medium, and the bleed air gas is extracted. Is heated.
  • the structure of the heat exchanger reheater
  • the first heat medium can be used as the heat source of the bleed air gas in the heat exchanger.
  • the condensation in the condensation step of the first heat medium is promoted, so that the heat efficiency of the second turbine (turbine for the first heat medium) is improved. Improvement can be achieved.
  • the power recovery system (1) according to any one of 1) to 8) above.
  • a heat medium circulation cycle configured to circulate a heat medium that exchanges heat with the liquefied gas supplied from the liquefied gas storage device (31) or the gas discharged from the first turbine (2). 4), the heat medium circulation cycle (4) including the second turbine (7) using the heat medium as the working fluid, and A second leaked gas introduction pipe (18) for guiding the working fluid leaked from the shaft seal seal portion (74) of the second turbine (7) to the gas combustion device (51) is further provided.
  • the power recovery system transfers the gas leaked from the shaft seal portion of the second turbine of the heat medium circulation cycle (second leaked gas) to the gas combustion device through the second leaked gas introduction pipe. It can be guided and burned by the gas combustion device.
  • the power recovery system can suppress the outflow of the second leaked gas into the atmosphere by combusting the second leaked gas with a gas combustion device. Therefore, the power recovery system can suppress the leakage of gas from the second turbine to the atmosphere without improving the sealing performance of the shaft sealing portion of the second turbine as in the conventional case.
  • the second leaked gas can be used as fuel for the gas combustion device by combusting the second leaked gas with the gas combustion device.
  • the power recovery system does not have to improve the sealing performance of the shaft sealing portion of the second turbine as in the conventional case, so that the shaft sealing portion of the second turbine is used.
  • the structure can be simpler than before. As a result, it is possible to suppress the complexity and cost increase of the structure of the second turbine, and by extension, the cost increase of the power recovery system can be suppressed.
  • the power recovery system (1) is A second compressor (81) configured to compress air, A second compressed air introduction pipe (82) for introducing compressed air compressed in the second compressor (81) into the gas combustion device (51), and A part of the compressed air branched from the second compressed air introduction pipe (82) and compressed by the second compressor (81) is applied to the shaft sealing portion (74) of the second turbine (7).
  • a second compressed air supply pipe (83) for guiding is provided.
  • the power recovery system guides a part of the compressed air compressed by the second compressor to the shaft seal portion of the second turbine through the second compressed air supply pipe as an air seal.
  • the power recovery system uses the compressed air compressed by the second compressor as an air seal, the second leaked gas can be guided to the gas combustion device in a state where the compressed air is premixed. Combustion efficiency in a gas combustion device can be improved.
  • the floating structure (100) according to at least one embodiment of the present disclosure is The power recovery system (1) according to any one of 1) to 10) above was installed.
  • the power recovery system can suppress gas leakage of a turbine driven by a gas vaporized from liquefied gas, and at the same time, can suppress the complexity and cost increase of the structure of the turbine. As a result, it is possible to suppress the increase in the cost of the power recovery system, and by extension, the increase in the price of the floating structure on the water equipped with the power recovery system.
  • Power recovery system 2 1st turbine 3 Liquefied gas supply system 4 Heat medium circulation cycle 4A 1st heat medium circulation cycle 4B 2nd heat medium circulation cycle 5 Gas combustion system 7 2nd turbine 7A (for 1st heat medium) Turbine 7B Turbine (for second heat medium) 10 Power plant 11 First heat exchanger 12 Second heat exchanger 13,44,48 Generator 14 First leak gas introduction pipe 15 Blower 16 Boil-off gas introduction pipe 17th 1 Compressed air supply pipe 18 Second leak gas introduction pipe 18A, 18B Leakage gas introduction pipe 21, 71A, 71B Rotating shaft 22, 72A, 72B Turbine blade 23, 73A, 73B Casing 24, 74, 74A, 74B Shaft sealing part 24A Upstream seal 24B Downstream seal 24C Labyrinth seal 25, 52 Gas inlet 26 Gas outlet 31 Liquefi gas storage device 32 Liquefi gas supply line 33 Liquefi gas pump 34 Supply destination 41 First heat medium circulation line 42, 46 Circulation pump 43 Third heat exchanger 45 Second heat medium circulation line 47 Fourth heat exchange

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Ocean & Marine Engineering (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)

Abstract

L'invention concerne un système de récupération d'énergie motrice permettant de récupérer l'énergie motrice à partir d'un gaz liquéfié fourni à partir d'un dispositif de stockage de gaz liquéfié qui stocke le gaz liquéfié. Ledit système est doté : d'une première turbine qui est entraînée au moyen d'un gaz obtenu par vaporisation du gaz liquéfié fourni par le dispositif de stockage de gaz liquéfié ; d'un premier tuyau d'introduction de gaz de fuite pour guider le gaz qui a fui à partir d'une partie d'étanchéité d'arbre de la première turbine ; et d'un dispositif de combustion de gaz pour brûler le gaz guidé par le premier tuyau d'introduction de gaz de fuite.
PCT/JP2021/029980 2020-08-28 2021-08-17 Système de récupération d'énergie motrice, et structure flottante portée par l'eau WO2022044875A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202180052108.3A CN115917122A (zh) 2020-08-28 2021-08-17 动力回收系统及水上漂浮结构体
KR1020237005859A KR20230042071A (ko) 2020-08-28 2021-08-17 동력 회수 시스템 및 수상 부유 구조체

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JP2020144589A JP7474660B2 (ja) 2020-08-28 2020-08-28 動力回収システムおよび水上浮遊構造体
JP2020-144589 2020-08-28

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WO2022044875A1 true WO2022044875A1 (fr) 2022-03-03

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55148907A (en) * 1979-05-08 1980-11-19 Setsuo Yamamoto Compound cycle plant
JPH1030408A (ja) * 1996-07-11 1998-02-03 Jgc Corp 高圧ガスからの圧力エネルギー回収設備
JP2014047676A (ja) * 2012-08-30 2014-03-17 Mitsubishi Heavy Ind Ltd 蒸気タービンおよびこれを備えたバイナリ発電装置
WO2015155818A1 (fr) * 2014-04-07 2015-10-15 三菱重工コンプレッサ株式会社 Installation flottante de production de gaz liquéfié
US20190112977A1 (en) * 2017-10-16 2019-04-18 Doosan Heavy Industries & Construction Co., Ltd. Combined power generation system using pressure difference

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016008042A (ja) 2014-06-25 2016-01-18 潮冷熱株式会社 Ｌｎｇ船のバイナリー発電システム

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55148907A (en) * 1979-05-08 1980-11-19 Setsuo Yamamoto Compound cycle plant
JPH1030408A (ja) * 1996-07-11 1998-02-03 Jgc Corp 高圧ガスからの圧力エネルギー回収設備
JP2014047676A (ja) * 2012-08-30 2014-03-17 Mitsubishi Heavy Ind Ltd 蒸気タービンおよびこれを備えたバイナリ発電装置
WO2015155818A1 (fr) * 2014-04-07 2015-10-15 三菱重工コンプレッサ株式会社 Installation flottante de production de gaz liquéfié
US20190112977A1 (en) * 2017-10-16 2019-04-18 Doosan Heavy Industries & Construction Co., Ltd. Combined power generation system using pressure difference

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JP7474660B2 (ja) 2024-04-25
CN115917122A (zh) 2023-04-04
KR20230042071A (ko) 2023-03-27

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