1. A system for cooling heated components in a hot gas path of a turbine, comprising:
at least one liquid source comprising coolant liquid; and
at least one liquid nozzle in fluid communication with the at least one liquid source and operable to deliver the coolant liquid in an atomized form adjacent to at least one heated turbine component positioned in a hot gas path of the turbine;
wherein upon delivering the atomized coolant liquid adjacent to the at least one heated turbine component, at least a portion of the coolant liquid substantially changes phase to a gas.
2. The system of claim 1, further comprises at least one pump for pressurizing the coolant liquid from the at least one liquid source.
3. The system of claim 1, further comprising a pipe system coupling the at least one liquid source and the at least one liquid nozzle.
4. The system of claim 3, wherein the pipe system comprises a thermal insulation.
5. The system of claim 1, wherein the coolant liquid comprises water.
6. The system of claim 1, wherein the at least one heated turbine component comprises at least one of a turbine bucket, a turbine wheel, a turbine nozzle, or a turbine shroud.
7. The system of claim 1, wherein the at least one heated turbine component comprises a turbine bucket comprising a first side and a second side creating an inner space therein and comprising a plurality of orifices extending through at least one of the first side or the second side, and wherein upon delivering the atomized coolant liquid adjacent to the turbine bucket, at least a part of the gas passes through the inner space and exits out of the inner space to the hot gas path through at least a portion of the plurality of orifices.
8. The system of claim 1, further comprising a purging unit to purge an excess amount of the coolant liquid from the hot gas path.
9. A method for cooling heated components in a hot gas path of a turbine, comprising:
providing at least one liquid source comprising a coolant liquid in fluid communication with at least one liquid nozzle, wherein the at least one liquid nozzle is positioned adjacent to at least one heated turbine component positioned in a hot gas path of the turbine;
atomizing the coolant liquid from the at least one liquid source; and
delivering the atomized coolant liquid adjacent to the at least one heated turbine component;
wherein upon delivering the atomized coolant liquid adjacent to the at least one heated turbine component, at least a portion of the coolant liquid substantially changes phase to a gas.
10. The method of claim 9, further comprising pressurizing the coolant liquid from the at least one liquid source by at least one pump.
11. The method of claim 9, wherein the coolant liquid comprises water.
12. The method of claim 9, further comprising insulating the liquid prior to delivering the coolant liquid adjacent to the at least one heated turbine component.
13. The method of claim 9, wherein the at least one heated turbine component comprises at least one of a turbine bucket, a turbine wheel, a turbine nozzle, or a turbine shroud.
14. The method of claim 9, wherein the at least one heated turbine component comprises a turbine bucket comprising a first side and a second side creating an inner space therein and comprising a plurality of orifices extending through at least one of the first side or the second side, and wherein upon delivering the atomized coolant liquid adjacent to the turbine bucket, at least a part of the gas passes through the inner space and exits out of the inner space to the hot gas path through at least a portion of the plurality of orifices.
15. The method of claim 9, further comprising purging excess liquid from the hot gas path subsequent to reducing the turbine speed below load.
16. A method for operating a turbine, comprising:
starting the turbine;
increasing the turbine speed to operate at a predetermined load;
atomizing a coolant liquid;
delivering the atomized coolant liquid adjacent to at least one heated turbine component positioned in a hot gas path of the turbine subsequent to increasing the turbine speed to operate at the predetermined load, wherein upon delivering the atomized coolant liquid, at least a portion of the coolant liquid substantially changes phase to a gas;
reducing the turbine speed to operate below the predetermined load; and
purging excess liquid from the hot gas path subsequent to reducing the turbine speed below the predetermined load.
17. The method of claim 16 wherein the coolant liquid comprises water.
18. The method of claim 16, wherein the at least one heated turbine component comprises at least one of a turbine bucket, a turbine wheel, a turbine nozzle, or a turbine shroud.
19. The method of claim 16, wherein purging excess liquid from the hot gas path is performed prior to a next start-up of the turbine.
20. The method of claim 16, wherein purging excess liquid from the hot gas path is performed upon a shut-down of the turbine.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A workpiece ejecting device for a machine tool including a head stock, a spindle installed rotatably at the head stock, a chuck installed at a front end surface of the spindle to clamp the workpiece, a drawing tube installed at the inside of the spindle as a hollow shaft and connected at a front end thereof to the chuck to rotate integrally with the spindle, and a chucking cylinder installed at the head stock so that it can clamp or unclamp the workpiece clamped at the chuck by moving the drawing tube forward and rearward in the axial direction, the workpiece ejecting device comprising:
an ejecting cylinder mounted at one side of the head stock in such a fashion that its center is aligned with the center of the spindle;
an ejecting rod adapted not to rotate and having a length extending from the hollow inside of the drawing tube to a position adjacent to the chuck, the ejecting rod being axially formed at the inside thereof with a fluid passing opening, and being moved reciprocally in the axial direction as a rod for the ejecting cylinder by means of the ejecting cylinder to thereby push the unclamped workpiece from the chuck to the outside; and
a front bearing unit installed between an inner peripheral surface of the drawing tube opposite to the ejecting cylinder and an outer peripheral surface of the ejecting rod so that it can support the rotation of the drawing tube.
2. The ejecting device according to claim 1 wherein the front bearing unit comprises:
A bearing housing inserted into the inner peripheral surface of the drawing tube;
At least one bearing inserted into an inner peripheral surface of the bearing housing and at the same time clamped to an outer peripheral surface of the ejecting rod; and
means for clamping the bearing to the ejecting rod.
3. The ejecting device according, to claim 2, wherein the bearing clamping means comprises:
a spacer for pushing an inner ring of the bearing to a stepped portion of the ejecting rod; and
a lock nut thread engaged with the ejecting rod to clamp a position of the spacer.
4. The ejecting device according to claim 2, wherein an O-ring is installed at an outer peripheral surface of the bearing housing so that it contacts slidably with the inner peripheral surface of the drawing tube to block flowing in of coolant, and an oil seal is installed at an inner peripheral surface of the bearing housing.
5. A workpiece ejecting device for a machine tool including a head stock, a spindle installed rotatably at the head stock, a chuck installed at a front end surface of the spindle to clamp the workpiece, a drawing tube installed at the inside of the spindle as a hollow shaft and connected at a front end thereof to the chuck to rotate integrally with the spindle, and a chucking cylinder installed at the head stock so that it can clamp or unclamp the workpiece clamped at the chuck by moving the drawing tube forward and rearward in the axial direction, the workpiece ejecting device comprising:
an ejecting cylinder mounted at one side of the head stock in such a fashion that its center is aligned with the center of the spindle;
an ejecting rod adapted not to rotate and having a length extending the hollow inside of the drawing tube to a position adjacent to the chuck, the ejecting rod being axially formed at the inside thereof with a fluid passing opening, and being directly connected at the rear end thereof to the front end of a cylinder rod of the ejecting cylinder and moved reciprocally in the axial direction as a rod for the ejecting cylinder by means of the ejecting cylinder to thereby push the unclamped workpiece from the chuck to the outside; and
a front bearing unit installed between an inner peripheral surface of the drawing tube opposite to the ejecting cylinder and an outer peripheral surface of the ejecting rod so that it can support the rotation of the drawing tube.
6. The ejecting device according to claim 5, wherein the front bearing unit comprises:
a bearing housing inserted into the inner peripheral surface of the drawing tube;
at least one bearing inserted into an inner peripheral surface of the bearing housing and at the same time clamped to an inner peripheral surface of the ejecting rod; and
means for clamping the bearing to the ejecting rod.
7. The ejecting device according to claim 5, wherein the bearing clamping means comprises:
a spacer for pushing an inner ring of the bearing to a stepped portion of the ejecting rod; and
a lock nut thread engaged with the ejecting rod to clamp a position of the spacer.
8. The ejecting device according to claim 5, wherein the rear end of the ejecting rod and the rod of the ejecting cylinder are screw-engaged with each other.
9. The ejecting device according to claim 5, wherein a fluid passing opening is formed at the center axis of the ejecting rod and the rod of the ejecting cylinder.