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1 EP 2 687 703 A2 2 Description FIELD [0001] Embodiments described herein relate generally to a turbine. BACKGROUND [0002] In a conventional power generation plant, a gas turbine, a steam turbine and so on are used as a power source for power generation. [0003] To obtain much motive force from the turbine, a turbine of specifications of employing working fluid at a temperature equal to or higher than the heat proof tem- perature of turbine blades has also been developed. In this kind of turbine, for example, coolant is injected and is made to pass through the inside of the turbine blades to cool the turbine blades. [0004] The turbine of the specifications is also con- stantly required to improve the energy efficiency. SUMMARY [0005] A problem to be solved by the present invention is to provide a turbine capable of increasing the energy efficiency. [0006] A turbine in one embodiment is a turbine using CO2 as working fluid and coolant including a rotor, a plu- rality of moving blades, a plurality of stator blades, a work- ing fluid transport flow path, a coolant transport flow path, and a coolant recovery flow path. The plurality of moving blades are arranged along an axis of the rotor. The plu- rality of stator blades constitute a plurality of turbine stag- es together with the plurality of moving blades. The work- ing fluid transport flow path is configured to transport the working fluid sequentially to the plurality of turbine stag- es. The coolant transport flow path is configured to trans- port the coolant by allowing the coolant to sequentially pass through the inside of the plurality of stator blades from an upstream to a downstream of the working fluid. The coolant recovery flow path is configured to recover the coolant passing through the inside of the stator blade at a predetermined turbine stage and merge the recov- ered coolant with the working fluid transport flow path at a turbine stage on an upstream side of the predetermined turbine stage. BRIEF DESCRIPTION OF THE DRAWINGS [0007] FIG. 1 is a block diagram of a thermal power generation system including a CO2 turbine according to a first embodiment. [0008] FIG. 2 is a sectional view illustrating a structure at the periphery of a coolant recovery flow path included in the CO2 turbine in FIG. 1. [0009] FIG. 3 is an enlarged sectional view illustrating a structure at the periphery of a nozzle in FIG. 2. [0010] FIG. 4 is a view schematically illustrating the periphery of the nozzle in FIG. 3 in a state seen from a direction of a diameter of a rotor. [0011] FIG. 5 is a view for explaining the flow of coolant at the periphery of the nozzle in FIG. 2. [0012] FIG. 6 is a sectional view along A-A in FIG. 5. [0013] FIG. 7 is a sectional view along B-B in FIG. 5. [0014] FIG. 8 is a sectional view along C-C in FIG. 5. [0015] FIG. 9 is a sectional view illustrating a structure at the periphery of a coolant recovery flow path of a CO2 turbine according to a second embodiment. [0016] FIG. 10 is a sectional view for explaining in detail the coolant recovery flow path illustrated in FIG. 9. [0017] FIG. 11 is a perspective view illustrating a struc- ture of a part of the coolant recovery flow path provided in a nozzle segment included in the CO2 turbine in FIG. 9. [0018] FIG. 12 is a sectional view of the structure at the periphery of the coolant recovery flow path in FIG. 9 as seen in a direction of an axis of a rotor. [0019] FIG. 13 is a sectional view illustrating a structure at the periphery of a coolant recovery flow path of a CO2 turbine according to a third embodiment. [0020] FIG. 14 is a sectional view along D-D in FIG. 13. [0021] FIG. 15 is a sectional view illustrating a structure at the periphery of a coolant recovery flow path of a CO2 turbine according to a fourth embodiment. DETAILED DESCRIPTION [0022] Hereinafter, embodiments will be described based on the drawings. (First Embodiment) [0023] As illustrated in FIG. 1, a thermal power gener- ation system 20 according to this embodiment includes a CO2 turbine 5, a CO2 pump 1, a regenerative heat ex- changer 2, an oxygen producer 3, a combustor 4, a power generator 6, a cooler 7, a humidity separator 8 and so on. [0024] The CO2 pump 1 compresses highly-pure CO2 made by separating water from a combustion gas (CO2 and vapor) by the humidity separator 8, and supplies the CO2 at high pressure to the combustor 4 and the CO2 turbine 5 in a branching manner through the regenerative heat exchanger 2. [0025] Note that the highly-pure CO2 at higher pres- sure generated in the CO2 pump 1 may be stored or utilized for enhanced oil recovery. In short, the one CO2 pump 1 doubles as supply sources for working CO2 and cooling CO2. The working CO2 may be called working gas or working fluid, and the cooling CO2 may be called cooling gas, cooling fluid, or coolant. [0026] The regenerative heat exchanger 2 supplies CO2 increased in temperature by heat exchange to the combustor 4. The regenerative heat exchanger 2 sup- plies part of CO2 to the CO2 turbine 5 before complete heat exchange. CO2 supplied to the combustor 4 is for working. CO2 supplied to the CO2 turbine 5 is for cooling 5 10 15 20 25 30 35 40 45 50 55 2PDF Image | EP 2 687 703 A2
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