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7 EP 2 687 703 A2 8 covery flow path 37 in the first embodiment as illustrated in FIG. 15. The coolant recovery flow path 77 has a stator blade (nozzle) re-cooling flow path 77c. The stator blade re-cooling flow path 77c recovers the coolant at a turbine stage (for example, a fifth turbine stage 55) on the down- stream side of a predetermined turbine stage (for exam- ple, a third turbine stage 53). The stator blade re-cooling flow path 77c allows the recovered coolant to go through the inside of a nozzle (stator blade) 16 at the predeter- mined turbine stage and then transports the coolant to- ward a turbine stage (for example, the downstream side of a second turbine stage 52) on the upstream side of the predetermined turbine stage. [0056] More specifically, the stator blade re-cooling flow path 77c is provided also at a turbine stage (for ex- ample, a fourth turbine stage 54) preceding to the turbine stage at which the coolant has been recovered. In other words, the stator blade re-cooling flow path 77c is a flow path for cooling the nozzle (stator blade) 16 at a preced- ing turbine stage in order from a subsequent turbine stage before merging with a working fluid transport flow path 35. [0057] Consequently, according to the CO2 turbine in this embodiment, it is possible to improve the cooling performance with respect to the nozzle 16 as well as to effectively utilize the coolant as working fluid. [0058] According to the embodiments described above, the energy efficiency can be increased. [0059] While certain embodiments have been de- scribed, these embodiments have been presented by way of example only, and are not intended to limit the scope of the inventions. Indeed, the novel embodiments described herein may be embodied in a variety of other forms; furthermore, various omissions, substitutions and changes in the form of the embodiments described herein may be made without departing from the spirit of the in- ventions. The accompanying claims and their equiva- lents are intended to cover such forms or modifications as would fall within the scope and spirit of the inventions. Claims 1. A turbine using CO2 as working fluid and coolant, comprising: a rotor; a plurality of moving blades arranged along an axis of the rotor; a plurality of stator blades constituting a plurality of turbine stages together with the plurality of moving blades; a working fluid transport flow path configured to transport the working fluid sequentially to the plurality of turbine stages; a coolant transport flow path configured to trans- port the coolant by allowing the coolant to se- quentially pass through the inside of the plurality of stator blades from an upstream to a down- stream of the working fluid; and a coolant recovery flow path configured to re- cover the coolant passing through the inside of the stator blade at a predetermined turbine stage and merge the recovered coolant with the work- ing fluid transport flow path at a turbine stage on an upstream side of the predetermined turbine stage. 2. The turbine according to claim 1, wherein the coolant recovery flow path collects cool- ant recovered at the predetermined turbine stage and at a turbine stage on a downstream side of the predetermined turbine stage respectively, and trans- ports the collected coolant toward the turbine stage on the upstream side of the predetermined turbine stage. 3. The turbine according to claim 1, wherein the coolant recovery flow path recovers coolant at a turbine stage on a downstream side of the predetermined turbine stage, allows the recov- ered coolant to go through the inside of the stator blade at the predetermined turbine stage, and then transports the coolant toward the turbine stage on the upstream side of the predetermined turbine stage. 4. The turbine according to claim 1, further comprising: a plurality of holding members configured to hold the plurality of stator blades respectively; and a seal member configured to seal a gap between the plurality of holding members from a prede- termined direction, wherein the coolant recovery flow path goes through a space surrounded by the plurality of holding members and the seal member. 5. The turbine according to claim 1, further comprising: a casing configured to house the plurality of sta- tor blades and the plurality of moving blades; a plurality of holding members configured to hold the plurality of stator blades respectively; and a plurality of fixing members configured to fix the plurality of holding members to the casing, wherein the coolant recovery flow path goes through the inside of the plurality of fixing mem- bers. 6. The turbine according to claim 1, further comprising a casing configured to house the plurality of stator blades and the plurality of moving blades, wherein the coolant recovery flow path goes through the in- side of the casing. 5 10 15 20 25 30 35 40 45 50 55 5PDF Image | EP 2 687 703 A2
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