Solar energy system

• US 7,836,695 B2
• Filed: 03/06/2007
• Issued: 11/23/2010
• Est. Priority Date: 03/06/2007
• Status: Expired due to Fees

• Current Assignee: Solar and Environmental Technologies, Corp.
• Original Assignee: Solar and Environmental Technologies, Corp.
• Inventors: Lazzara, Samuel P., Zelinger, Stanley H., Derby, Ronald C., Dampier, William P.
• Primary Examiner(s): Nguyen; Hoang M
• Application Number:
  US11/682,407
• Publication Number:
  US 20080216822A1
• Time in Patent Office: 1,358 Days
• Field of Search: 606418-64115
• US Class Current: 60/641.8
• CPC Class Codes: F01K 3/00 Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein regenerating exhaust steam F01K19/00
• CPC Class Codes: F03G 6/065 having a Rankine cycle
• CPC Class Codes: F03G 6/067 Binary cycle plants where the fluid from the solar collector heats the working fluid via a heat exchanger
• CPC Class Codes: F05B 2220/301 in steam turbines
• CPC Class Codes: F22B 1/006 using solar heat solar heat collectors per se F24S; devices for producing mechanical power from solar energy F03G6/00
• CPC Class Codes: F24S 20/20 Solar heat collectors for receiving concentrated solar energy, e.g. receivers for solar power plants
• CPC Class Codes: F24S 2030/134 in the form of gearings or rack-and-pinion transmissions
• CPC Class Codes: F24S 2030/136 for moving several solar collectors by common transmission elements
• CPC Class Codes: F24S 2030/145 Tracks
• CPC Class Codes: F24S 23/71 with parabolic reflective surfaces with cylindro-parabolic reflective surfaces F24S23/74
• CPC Class Codes: F24S 30/452 Vertical primary axis
• CPC Class Codes: F28D 20/0056 using solid heat storage material F28D20/0052 takes precedence
• CPC Class Codes: F28D 2020/006 Heat storage systems not otherwise provided for
• CPC Class Codes: Y02E 10/40 Solar thermal energy, e.g. solar towers
• CPC Class Codes: Y02E 10/46 Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
• CPC Class Codes: Y02E 10/47 Mountings or tracking
• CPC Class Codes: Y02E 60/14 Thermal energy storage
• CPC Class Codes: Y02E 70/30 Systems combining energy storage with energy generation of non-fossil origin

Abstract

A solar energy system includes a plurality of concentrating dishes and a plurality of heated air collectors. Each collector receives directed rays of sunlight from one of the concentrating dishes. A heated air distribution assembly collects air heated in the collectors. A thermal storage assembly is operably connected to the heated air distribution assembly and has a plurality of thermal storage elements. A steam generator is operably connected to the heated air distribution assembly and the thermal storage assembly. A steam turbine is operably connected to the steam generator.

Claims

1. A solar energy system comprising:

a plurality of concentrating dishes;

a plurality of heated air collectors, each collector receiving directed rays of sunlight from one of the concentrating dishes;

a heated air distribution assembly to collect air heated in the collectors;

a thermal storage assembly operably connected to the heated air distribution assembly and having a plurality of thermal storage elements;

a steam generator operably connected to the heated air distribution assembly and the thermal storage assembly such that heated air flows directly from the collectors to the steam generator without entering the thermal storage assembly under a first condition, directly from the collectors to the thermal storage assembly under a second condition, directly from the collectors to both the thermal storage assembly and the steam generator under a third condition, and directly from the thermal storage assembly to the steam generator under a fourth condition; and

a steam turbine operably connected to the steam generator.

2. The solar energy system of claim 1, wherein the concentrating dishes are parabolic mirrors.

3. The solar energy system of claim 1, wherein the concentrating dishes are secured to a collector assembly frame and are movable in unison.

4. The solar energy system of claim 3, further comprising an azimuth control system having a plurality of azimuth control assemblies and at least one rail, each azimuth control assembly secured to a portion of the collector assembly frame and movable along one of the rails.

5. The solar energy system of claim 4, wherein each azimuth control assembly comprises:

a frame member supporting a portion of the collector assembly frame;

an axle extending through the frame member;

a wheel supported by the axle and riding along one of the rails; and

a motor operably connected to the axle to rotate the axle.

6. The solar energy system of claim 1, further comprising an elevation control assembly operably connected to the concentrating dishes to alter the elevation of the concentrating dishes.

7. The solar energy system of claim 6, wherein the elevation control assembly comprises:

a motor;

a drive arm driven by the motor;

a link arm pivotally connected to and driven by the drive arm;

and a plurality of driven arms;

each driven arm pivotally connected to and driven by the link arm, and fixedly connected to one of the concentrating dishes.

8. The solar energy system of claim 1, wherein each collector comprises:

an inner core having a central aperture extending therethrough;

a plurality of fins extending inwardly from an interior surface of the inner core, one end of the fins receiving reflected rays from one of the concentrating dishes;

an outer core surrounding the inner core;

insulation surrounding the outer core;

an inner shell surrounding the insulation;

an outer shell surrounding the inner shell;

an air inlet passage positioned between the inner and outer shells and in fluid communication with the central aperture of the inner core; and

an air outlet passage in fluid communication with the central aperture of the inner core and the heated air distribution assembly.

9. The solar energy system of claim 8, further comprising a collector tube having a first end connected to the heated air distribution assembly and a second end connected to the collector, the collector tube housing a portion of the air outlet passage and a portion of the air inlet passage.

10. The solar energy system of claim 9, further comprising a blower in the collector tube to force air through the air inlet passage.

11. The solar energy system of claim 1, wherein the thermal storage assembly comprises:

a housing having an air inlet;

a first valve positioned in the air inlet;

a storage chamber having a storage air inlet in fluid communication with the air inlet and a storage air outlet, the thermal storage elements being positioned in the storage chamber;

a second valve positioned in the storage air inlet;

a generator air inlet in fluid communication with the air inlet and the storage air inlet; and

a third valve positioned in the generator air inlet.

12. The solar energy system of claim 11, wherein the storage chamber extends substantially circularly within the housing.

13. The solar energy system of claim 11, wherein the first, second and third valves are formed of a porcelain material.

14. The solar energy system of claim 11, further comprising a blower system operably connected to the storage chamber and a generator air outlet.

15. The solar energy system of claim 1, wherein the thermal storage elements are formed of an inert material.

16. The solar energy system of claim 1, wherein the thermal storage elements are formed of a ceramic material.

17. The solar energy system of claim 1, wherein the thermal storage elements are spherical.

18. A solar energy system comprising:

a housing;

a plurality of rails on an upper surface of the housing;

a collector assembly frame movably connected to the rails;

a plurality of parabolic mirrors secured to the frame;

a plurality of heated air collectors, each collector receiving directed rays of sunlight from one of the parabolic mirrors;

a heated air distribution assembly to collect air heated in the collectors;

a thermal storage assembly positioned within the housing and having a storage chamber including a plurality of thermal storage elements, the storage chamber being operably connected to the heated air distribution assembly;

a steam generator operably connected to the heated air distribution assembly and the storage chamber such that heated air flows directly from the collectors to the steam generator without entering the thermal storage assembly under a first condition, directly from the collectors to the thermal storage assembly under a second condition, directly from the collectors to both the thermal storage assembly and the steam generator under a third condition, and directly from the thermal storage assembly to the steam generator under a fourth condition; and

a steam turbine operably connected to the steam generator.

19. The solar energy system of claim 18, wherein the steam generator is positioned within the housing.

20. The solar energy system of claim 18, further comprising an azimuth control system having a plurality of azimuth control assemblies, each azimuth control assembly secured to a portion of the collector assembly frame and movable along one of the rails.

21. The solar energy system of claim 20, wherein each azimuth control assembly comprises:

a frame member supporting a portion of the collector assembly frame;

an axle extending through the frame member;

a wheel supported by the axle and riding along one of the rails; and

a motor operably connected to the axle to rotate the axle.

22. The solar energy system of claim 18, further comprising an elevation control assembly operably connected to the parabolic mirrors to alter the elevation of the parabolic mirrors.

23. The solar energy system of claim 22, wherein the elevation control assembly comprises:

a motor;

a drive arm driven by the motor;

a link arm pivotally connected to and driven by the drive arm;

and a plurality of driven arms;

each driven arm pivotally connected to and driven by the link arm, and fixedly connected to one of the parabolic mirrors.

24. The solar energy system of claim 18, wherein each collector comprises:

an inner core having a central aperture extending therethrough, one end of the aperture receiving reflected rays from one of the parabolic mirrors;

a plurality of fins extending inwardly from an interior surface of the inner core;

an outer core surrounding the inner core;

insulation surrounding the outer core;

an inner shell surrounding the insulation;

an outer shell surrounding the inner shell;

an air inlet passage positioned between the inner and outer shells and in fluid communication with the central aperture of the inner core; and

an air outlet passage in fluid communication with the central aperture of the inner core and the heated air distribution assembly.

25. The solar energy system of claim 18, wherein the thermal storage assembly comprises:

a housing having an air inlet;

a first valve positioned in the air inlet;

storage air inlet at a first end of the storage chamber and in fluid communication with the air inlet;

a storage air outlet at a second end of the storage chamber;

a second valve positioned in the storage air inlet;

a generator air inlet in fluid communication with the air inlet and the storage air inlet; and

a third valve positioned in the generator air inlet.

26. The solar energy system of claim 18, wherein the thermal storage elements are ceramic spheres.

27. A solar energy system comprising:

a housing;

a plurality of rails on an upper surface of the housing;

a collector assembly frame movably connected to the rails;

a plurality of parabolic mirrors secured to the frame;

a plurality of heated air collectors, each collector receiving directed rays of sunlight from one of the parabolic mirrors;

a heated air distribution assembly to collect air heated in the collectors;

a plurality of azimuth control assemblies and at least one rail, each azimuth control assembly secured to a portion of the collector assembly frame and movable along one of the rails;

an elevation control assembly operably connected to the parabolic mirrors to alter the elevation of the parabolic mirrors;

a thermal storage assembly positioned within the housing and having a storage chamber including a plurality of inert thermal storage elements, the storage chamber being operably connected to the heated air distribution assembly;

a steam generator operably connected to the heated air distribution assembly and the storage chamber such that heated air flows directly from the collectors to the steam generator without entering the storage chamber under a first condition, directly from the collectors to the storage chamber under a second condition, directly from the collectors to both the storage chamber and the steam generator under a third condition, and directly from the storage chamber to the steam generator under a fourth condition; and

a steam turbine operably connected to the steam generator.

28. The solar energy system of claim 27, wherein each collector comprises:

an inner core having a central aperture extending therethrough;

a plurality of fins extending inwardly from an interior surface of the inner core, one end of the fins receiving reflected rays from one of the concentrating dishes;

an outer core surrounding the inner core;

insulation surrounding the outer core;

an inner shell surrounding the insulation;

an outer shell surrounding the inner shell;

an air inlet passage positioned between the inner and outer shells and in fluid communication with the central aperture of the inner core; and

an air outlet passage in fluid communication with the central aperture of the inner core and the heated air distribution assembly.

29. The solar energy system of claim 27, wherein the thermal storage assembly comprises:

an air inlet in the housing;

a first valve positioned in the air inlet;

a storage air inlet at a first end of the storage chamber in fluid communication with the air inlet;

a storage air outlet at a second end of the storage chamber;

a second valve positioned in the storage air inlet;

a generator air inlet in fluid communication with the air inlet and the storage air inlet; and

a third valve positioned in the generator air inlet.

30. The solar energy system of claim 27, wherein the thermal storage elements are ceramic spheres.