Method and apparatus for operating a solar steam system
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B60K-016/00
F24J-002/07
F24J-002/16
출원번호
US-0511158
(2010-11-23)
등록번호
US-9003795
(2015-04-14)
국제출원번호
PCT/IB2010/055368
(2010-11-23)
§371/§102 date
20120522
(20120522)
국제공개번호
WO2011/064718
(2011-06-03)
발명자
/ 주소
Katz, Sami
Kroizer, Israel
출원인 / 주소
Brightsource Industries (Israel) Ltd.
대리인 / 주소
Miles & Stockbridge P.C.
인용정보
피인용 횟수 :
0인용 특허 :
58
초록▼
The disclosed subject matter relates to methods and systems for operating a solar steam system in response to a detected or predicted reduced insolation condition (for example, sunset or a cloud condition). In some embodiments, for a period of time, enthalpy stored within a solid material of a condu
The disclosed subject matter relates to methods and systems for operating a solar steam system in response to a detected or predicted reduced insolation condition (for example, sunset or a cloud condition). In some embodiments, for a period of time, enthalpy stored within a solid material of a conduit via which steam travels en route to a steam turbine is used to heat the steam to drive the turbine. In some embodiments, a net migration of heliostats away from the steam superheater is carried out in response to the detected or predicted reduced insolation condition.
대표청구항▼
1. A solar steam system comprising: an upstream solar receiver configured to subject pressurized water flowing therein to an insolation-driven phase change to produce pressurized steam;a downstream solar receiver in fluid communication with the upstream solar receiver and configured to use insolatio
1. A solar steam system comprising: an upstream solar receiver configured to subject pressurized water flowing therein to an insolation-driven phase change to produce pressurized steam;a downstream solar receiver in fluid communication with the upstream solar receiver and configured to use insolation directed thereon to superheat the pressurized steam from the upstream solar receiver;a steam turbine coupled to receive a flow of steam exiting from the downstream solar receiver and configured to be driven by superheated steam;a plurality of heliostats configured to re-direct insolation onto the upstream solar receiver or the downstream solar receiver; anda control apparatus for regulating at least one of flow and insolation properties of the solar steam system, the control apparatus being configured to respond to a diminishing insolation event by re-aiming at least some of the plurality of heliostats to effect a net migration of heliostats from aiming at the downstream solar receiver to aiming at the upstream solar receiver so as to reduce an extent of superheating in the downstream solar receiver while the steam turbine continues to be driven by steam that is further heated after exiting the downstream solar receiver en route to the steam turbine. 2. The system of claim 1, further comprising: one or more insulated conduits for conveying steam from the downstream receiver to the steam turbine, each conduit including a solid material,wherein, after said re-aiming of heliostats in response to the diminishing insolation event, steam exiting the downstream solar receiver is further heated by enthalpy contained in the solid material of each conduit en route to the steam turbine. 3. The system of claim 2, wherein the control apparatus is configured to block the steam flow into the steam turbine at a time after said re-aiming of heliostats so as to effect an orderly shutdown of the steam turbine. 4. The system of claim 3, wherein the control apparatus is configured to block the steam flow such that a time between said re-aiming of heliostats and a cessation of steam flow from the downstream receiver to the steam turbine is at least two minutes. 5. The system of claim 3, wherein the reduction in the extent of superheating in the downstream receiver causes a temperature drop of at least 20° C. for an inner wall of each conduit from a time of said re-aiming of heliostats to a time of a cessation of steam flow from the downstream receiver to the steam turbine. 6. The system of claim 5, wherein the temperature drop is at least 50° C. 7. The system of claim 3, wherein for a majority of a time between said re-aiming of heliostats and the orderly shutdown of the steam turbine, the steam turbine operates at more than 10% of nominal rated capacity. 8. A solar steam system comprising: a first solar receiver configured to use insolation directed thereon to superheat steam;heliostats arranged to reflect insolation onto the first solar receiver so as to superheat the steam therein;a thermal mass thermally coupled to steam flowing from the outlet of the first solar receiver to an inlet of a steam turbine; anda controller programmed to re-aim at least one of the heliostats away from the first solar receiver and heat the steam from the first solar receiver with the thermal mass in response to a temperature of the steam at an outlet of the first solar receiver being less than a threshold temperature required for use by the steam turbine. 9. The solar steam system of claim 8, wherein the thermal mass is constructed and arranged so as to store heat from the steam flowing from the first solar receiver to the steam turbine when the temperature of the steam at the outlet exceeds the threshold temperature and to use the stored heat to heat the steam flowing from the first solar receiver to the steam turbine when the temperature of the steam at the outlet drops below the threshold temperature. 10. The solar steam system of claim 8, wherein the thermal mass includes at least a portion of a fluid conduit between the first solar receiver and the steam turbine. 11. The solar steam system of claim 8, further comprising: a second solar receiver arranged upstream of said first solar receiver,wherein the controller is configured to re-aim said at least one of the heliostats at the second solar receiver. 12. A method for providing solar heated steam to a steam turbine, comprising: at a first time, aiming heliostats in a solar field so as to direct insolation onto a superheating receiver;at the first time, flowing superheated steam exiting the superheating receiver into contact with a thermal mass and then to the steam turbine;at a second time when a temperature of the steam exiting the superheating receiver for the steam turbine drops below or is predicted to drop below an operating threshold temperature, re-aiming at least some of the heliostats away from the superheating receiver; andat the second time, passing the steam exiting the superheating receiver into thermal contact with the thermal mass and then to the steam turbine such that the thermal mass heats the exiting steam to a temperature above the operating threshold temperature prior to entering the steam turbine. 13. The method of claim 12, wherein said flowing steam to the steam turbine at the first time includes passing the steam exiting the superheating receiver into thermal contact with the thermal mass, the exiting steam having a temperature above said operating threshold temperature such that the thermal mass is heated to a temperature above the operating threshold temperature. 14. The method of claim 12, wherein the thermal mass includes at least a portion of a fluid conduit between the superheating receiver and the steam turbine. 15. The method of claim 12, wherein said re-aiming includes reducing solar energy incident on the superheating receiver in favor of increasing solar energy incident on another receiver supplying the superheating receiver with steam. 16. The method of claim 12, wherein the re-aiming includes re-aiming at least one heliostat away from the superheating receiver to another receiver, which supplies the superheating receiver with steam. 17. The system of claim 1, wherein the control apparatus is configured to re-aim to effect the net migration when a temperature of the steam exiting the downstream solar receiver drops below or is predicted to drop below a predetermined threshold temperature. 18. The system of claim 17, wherein said predetermined threshold temperature is an operating threshold temperature for the steam turbine. 19. A method for providing solar heated steam to a steam turbine, comprising: at a first time, aiming heliostats in a solar field so as to direct insolation onto a superheating receiver, and flowing superheated steam exiting the superheating receiver into contact with a thermal mass and then to the steam turbine, a temperature of the steam exiting the superheating receiver being greater than a predetermined threshold temperature; andafter the first time, re-aiming at least some of the heliostats away from the superheating receiver, and passing the steam exiting the superheating receiver into thermal contact with the thermal mass and then to the steam turbine, the temperature of the steam exiting the superheating receiver being less than the predetermined threshold temperature, wherein the thermal mass heats the exiting steam to greater than the predetermined threshold temperature prior to entering the steam turbine. 20. The method of claim 19, wherein said predetermined threshold temperature is an operating threshold temperature for the steam turbine.
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