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5 EP 2 687 703 A2 6 portion where the coolant transport flow path 36 switches to the coolant recovery flaw path 37 as illustrated in FIG. 5 (and FIG. 2). Further, a coolant merging hole 37a is provided at a portion of the coolant recovery flaw path 37 merging with the working fluid transport flow path 35 as illustrated in FIG. 5 (and FIG. 2). [0042] Here, the CO2 turbine 5 in this embodiment re- covers the coolant passing through the nozzle 16, for example, at a fifth turbine stage (predetermined turbine stage) 55 and merges the recovered coolant with the working fluid transport flow path 35 on the upstream side of the fifth turbine stage (for example, on the downstream side of a second turbine stage 52) as illustrated in FIG. 2. Here, the pressure of the coolant with pressure loss due to cooling of the nozzle balances with the pressure inside the working fluid transport flow path 35, on the downstream side of the second turbine stage 52. [0043] More specifically, not the coolant is simply transported to a further downstream side of the above- described fifth turbine stage (predetermined turbine stage) 55 but the coolant with a sufficient working pres- sure is merged with the working fluid transport flow path 35 from an appropriate turbine stage. As a result of this, the merged coolant can be made to serve as the working fluid. [0044] As has been described, according to the CO2 turbine 5 in this embodiment, the enthalpy loss (energy loss) of the coolant (cooling CO2) is suppressed (the pressure of the coolant is effectively utilized). As a result of this, the energy efficiency can be increased. (Second Embodiment) [0045] Next, a second embodiment will be described based on FIG. 9 to FIG. 12. Note that the same compo- nents in these drawings as those in the first embodiment illustrated in FIG. 1 to FIG. 8 are denoted by the same numerals, and duplicating descriptions are omitted. [0046] A CO2 turbine in this embodiment includes a coolant recovery flow path 47 in place of the coolant re- covery flow path 37 in the first embodiment as illustrated in FIG. 9 to FIG. 12. The coolant recovery flow path 47 includes a collection flow path 37c. The collection flow path 37c collects coolant respectively recovered at a pre- determined turbine stage (for example, a third turbine stage 53) and turbine stages (for example, fourth and fifth turbine stages 54, 55) on the downstream side of the predetermined turbine stage. The collection flow path 37c transports the collected coolant toward a turbine stage (for example, the downstream side of a second turbine state 52) on the upstream side of the predetermined tur- bine stage. [0047] Further, the collection flow path 37c included in the coolant recovery flow path 47 passes through (goes through) the inside of a member of an inner casing 15a (15b) as illustrated in FIG 12. Note that the collection flow path 37c is provided at a position where it does not phys- ically overlap with a major flow path 36a of a coolant transport flow path 36 inside the member of the inner casing 15a (15b). [0048] In more detail, the coolant recovery flow path 47 further includes a relay flow path 37d and a supply flow path 37e as illustrated in FIG. 9. The relay flow path 37d transports the coolant recovered from the turbine stages to the collection flow path 37c. The supply flow path 37e supplies the coolant from the collection flow path 37c to a working fluid transport flow path 35. [0049] According to the CO2 turbine in the second em- bodiment configured as described above, it is possible to recover the coolant (the coolant with less pressure loss due to nozzle cooling) also from a turbine stage closer to the turbine stage with which the coolant is merged and cause the coolant to function as the working fluid. There- fore, the energy efficiency can further be increased. (Third Embodiment) [0050] Next, a third embodiment will be described based on FIG. 13 and FIG. 14. Note that the same com- ponents in these drawings as those in the first and second embodiments illustrated in FIG. 1 to FIG. 12 are denoted by the same numerals, and duplicating descriptions are omitted. [0051] A CO2 turbine in this embodiment includes a coolant recovery flow path 57 in place of the coolant re- covery flow path 47 in the second embodiment. As illus- trated in FIG. 13 and FIG. 14, the coolant recovery flow path 57 includes a collection flow path 57c in place of the collection flow path 37c in the second embodiment. The collection flow path 57c passes through (goes through) the inside (member inside) of a plurality of shroud seg- ments 39. [0052] Note that in the CO2 turbine in this embodiment, a major flow path 36a of a coolant transport flow path 36 is provided also inside the shroud segment 39. In other words, the collection flow path 57c is arranged at a po- sition where it does not physically overlap with the major flow path 36a inside the shroud segment 39. [0053] According to the CO2 turbine in this embodi- ment, it is possible to process and form the collection flow path while it is divided into a plurality of shroud seg- ments, unlike the case where the collection flow path is processed and formed in the casing. Therefore, it is pos- sible in this embodiment to increase the processability of the collection flow path in addition to the effects in the second embodiment. (Fourth Embodiment) [0054] Next, a fourth embodiment will be described based on FIG. 15. Note that the same components in FIG. 15 as those in the first to third embodiments illus- trated in FIG. 1 to FIG. 14 are denoted by the same nu- merals, and duplicating descriptions are omitted. [0055] A CO2 turbine in this embodiment includes a coolant recovery flow path 77 in place of the coolant re- 5 10 15 20 25 30 35 40 45 50 55 4PDF Image | EP 2 687 703 A2
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