Power generation methods and systems

• US 20070119175A1
• Filed: 08/14/2006
• Published: 05/31/2007
• Est. Priority Date: 04/16/2002
• Status: Active Grant

• Current Assignee: Research Sciences, LLC
• Original Assignee: Research Sciences, LLC
• Inventors: Lackstrom, David, Ruggieri, Frank, Zielke, Clyde, Salvail, Napoleon, Draaisma, Rudolph
• Granted Patent: US 7,735,325 B2
• Time in Patent Office: Days
• US Class Current: 60/649
• CPC Class Codes: F01K 25/06 using mixtures of different fluids plants using mixtures of steam and gas F01K21/04
• CPC Class Codes: F03G 6/065 having a Rankine cycle
• CPC Class Codes: Y02B 10/20 Solar thermal
• 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 20/14 Combined heat and power generation [CHP]
• CPC Class Codes: Y02E 50/10 Biofuels, e.g. bio-diesel
• CPC Class Codes: Y02P 80/20 using renewable energy

Abstract

A closed loop system for generating mechanical energy at high efficiencies from hydrogen, fossil fuels, bio-fuels, solar or other renewable and recoverable energy sources. The system can have a heating source, a superheater, an expander, a receiver, a condenser, vacuum pump, or absorber, a desorber, and regenerator with pumps and controls. The heating source and superheater are used to heat a working fluid (including ammonia, other refrigerants, a combination of refrigerants, or steam). A positive displacement liquid/vapor expander expands the heated working fluid to the near saturated or saturated state utilizing a reduced pressure, low-pressure, or sub-atmospheric exhaust sink. A condenser, vacuum pump, or absorber is used to generate the reduced pressure, low pressure, or sub-atmospheric sink. The desorber is used to reconstitute inlet vapor (for reuse) and the regenerator recovers heat generated by the process. The system can generate mechanical energy (or power) which can be used to drive a wide range of mechanical systems (including pumps, compressors, vehicles, conveyances, or other similar mechanical devices); or used to drive an electrical generator to meet electrical power needs-for residences, businesses or office buildings, or commercial and industrial applications. The system can supply electrical energy to power grids, and can be an alternative to power generation plants.

Claims

1. A method for generating energy at high efficiencies from an energy source, comprising the steps of:

using a thermal generator for heating a pressurized working fluid;

using a positive displacement expander, having a fixed expansion ratio, for receiving and expanding the heated and pressurized working fluid, as received from the thermal generator, against a reduced pressure sink in order to produce mechanical work;

using a receiver for receiving and separating a liquid part and a vapor part of the working fluid discharge which exits from the positive displacement expander;

using an absorber, and a chemosorption process, to absorb the vapor working fluid received from the receiver and to generate a reduced pressure sink at the exit of the expander;

using a desorber for heating and reconstituting the vapor working fluid from the absorbent liquid produced in the absorber, and provide a resultant vapor working fluid to the thermal generator for reuse;

using a pump for pressurizing and moving the absorbent liquid produced in the absorber, as the result of chemosorption, to the desorber;

using a regenerator to recover heat energy contained in a liquid stream received from the desorber, to heat and vaporize the liquid part of the working fluid received from the receiver and provide a resultant vapor working fluid to the thermal generator for reuse; and

using a pump to transfer the liquid working fluid from the receiver to the regenerator.

13. The method or apparatus as set forth in claims 1, 2, 7 or 8, further comprising using a heat exchanger, which is positioned within the absorber, for cooling the chemosorption process in the absorber and recovering the heat produced as a result of the chemosorption process for heating the liquid working fluid received from the receiver prior to delivery to the regenerator.

14. The method or apparatus as set forth in claims 1-12, wherein said energy source comprises hydrogen.

15. The method or apparatus as set forth in claims 1-12, wherein said energy comprises fossil fuels.

16. The method or apparatus as set forth in claims 1-12, wherein said energy comprises bio-fuels.

17. The method or apparatus as set forth in claims 1-12, wherein said energy source comprises solar energy.

18. The method or apparatus as set forth in claims 1-12, wherein said energy source comprises a renewable energy source.

19. The method or apparatus as set forth in claims 1-12, wherein said energy source comprises a non-renewable energy source.

20. The method or apparatus as set forth in claims 1-12, wherein said energy source comprises heat energy recovered from an exhaust gas stream.

21. The method or apparatus as set forth in claims 1-12, wherein said energy source comprises a geothermal heat source.

22. The method or apparatus as set forth in claims 1, 2, 5 or 6, wherein a thermal generator is used to produce a heated and pressurized working fluid.

23. The method or apparatus as set forth in claims 1-12, wherein a heat source and superheater are used to produce a heated and pressurized working fluid.

24. The method or apparatus as set forth in claims 1-12, wherein a solar collector is used to produce a heated and pressurized working fluid.

25. The method or apparatus as set forth in claims 1-12, wherein a heat exchanger/heat recovery device is used to produce a heated and pressurized working fluid.

26. The method or apparatus as set forth in claims 1-12, further comprising using a heat exchanger/heat recovery device to recover heat from an available heat source including at least one of a process exhaust gas stream, a vehicle engine exhaust, and a geothermal heat source and use the recovered heat energy to heat, or preheat, the working fluid prior to its delivery to the inlet of the thermal generator.

27. The method or apparatus as set forth in claims 1-12, further comprising using a heat exchanger/heat recovery device to recover heat from an available heat source including at least one of a process exhaust gas stream, a vehicle engine exhaust and a geothermal heat source and use the recovered heat energy to heat, or preheat, the working fluid prior to its delivery to the inlet of the expander.

28. The method or apparatus as set forth in claims 1-12, further comprising using a solar collector to heat, or preheat, the working fluid prior to delivery of the pressurized gas working fluid to the inlet of the thermal generator.

29. The method or apparatus as set forth in claims 1-12, further comprising using a solar collector to heat, or preheat, the working fluid prior to delivery of the pressurized gas working fluid to the inlet of the expander.

30. The method or apparatus as set forth in claims 1-12, further comprising providing a scroll expander having a fixed expansion ratio as the positive displacement expander.

31. The method or apparatus as set forth in claims 1-12, further comprising providing a rotary vane expander having a fixed expansion ratio as the positive displacement expander.

32. The method or apparatus as set forth in claims 1-12, further comprising providing a Wankel-type expander having a fixed expansion ratio as the positive displacement expander.

33. The method or apparatus as set forth in claims 1-12, further comprising providing a piston type expander having a fixed expansion ratio as the positive displacement expander.

34. The method or apparatus as set forth in claims 1-12, further comprising providing a free-piston type expander having a fixed expansion ratio as the positive displacement expander.

35. The method or apparatus as set forth in claims 1-12, wherein ammonia or ammonia refrigerant is used as the working fluid.

36. The method or apparatus as set forth in claims 1-12, wherein steam is used as the working fluid.

37. The method or apparatus as set forth in claims 1-12, wherein a hydrochlorofluorocarbon based refrigerant is used as the working fluid.

38. The method or apparatus as set forth in claims 1-12, wherein a combination of hydrochlorofluorocarbon based refrigerants are used as the working fluid.

39. The method or apparatus as set forth in claims 1-12, a non-hydrochlorofluorocarbons is used as the working fluid.

40. The method or apparatus as set forth in claims 1-12, wherein a combination of non hydrochlorofluorocarbon refrigerants are used as the working fluid.

41. The method or apparatus as set forth in claims 1-12, wherein the produced mechanical work energy is used to rotate a shaft of an electrical generator to produce electrical power.

42. The method or apparatus as set forth in claims 1-12, wherein the mechanical work energy is used to rotate a shaft of an alternator to produce electrical power.

43. The method or apparatus as set forth in claims 1-12, wherein the mechanical work energy is used to drive a mechanical device.

44. The method or apparatus as set forth in claims 1-12, wherein the mechanical work energy is used to drive a machine.

45. The method or apparatus as set forth in claims 1-12, wherein the mechanical energy is used to drive an air conditioning compressor.

46. The method or apparatus as set forth in claims 1-12, wherein the mechanical work energy is used to drive a mechanically driven pump.

47. The method or apparatus as set forth in claims 1-12, wherein the mechanical work energy is used to drive a vehicle.

48. The method or apparatus as set forth in claims 1-12, wherein the mechanical work energy is used to drive a conveyance.

53. The method or apparatus as set forth in claims 1, 2, 5 or 6, further comprising using an absorber to provide the reduced pressure, low pressure, or sub atmospheric sink.

54. The method or apparatus as set forth in claims 1-12, wherein the reduced pressure sink is at subatmospheric pressures.

55. The method or apparatus as set forth in claims 1-12, wherein the reduced pressure sink is at atmospheric pressure.

56. The method or apparatus as set forth in claims 1-12, wherein the reduced pressure sink is near atmospheric pressure.

57. The method or apparatus as set forth in claims 1-12, wherein the reduced pressure sink is below the condensing pressure of the working fluid.

58. The method or apparatus as set forth in claims 1-12, wherein the reduced pressure sink is at the condensing pressure of the working fluid.

59. The method or apparatus as set forth in claims 1-12, wherein the reduced pressure sink is above the condensing pressure of the working fluid.

63. The method or apparatus as set forth in claims 1, 2, 5 or 6, wherein the desorber is used to reconstitute the absorbed working fluid.

64. The method or apparatus as set forth in claims 1, 2, 7 or 8, wherein the regenerator recovers heat energy from the liquid received from the desorber to heat and vaporize the liquid pumped to the regenerator from the receiver.

65. The method or apparatus as set forth in claims 1-12, wherein a heat exchanger/heat recovery device is used to recover heat energy from the working fluid for space heating.

66. The method or apparatus as set forth in claims 1-12, wherein a heat exchanger/heat recovery device is used to recover heat energy from the working fluid for process heating.

67. The method or apparatus as set forth in claims 1-12, wherein a heat exchanger/heat recovery device is used to extract cooling from the working fluid for space cooling.

68. The method or apparatus as set forth in claims 1-12, wherein a heat exchanger/heat recovery device is used to extract cooling from the working fluid for process cooling.

69. The method or apparatus as set forth in claims 1, 2, 5 or 6, wherein a heat exchanger/heat recovery device is used to recover heat energy from the absorbent liquid for space heating.

70. The method or apparatus as set forth in claims 1, 2, 5 or 6, wherein a heat exchanger/heat recovery device is used to recover heat energy from the absorbent liquid for process heating.

2. A method for generating mechanical energy at high efficiencies from an energy source, comprising the steps of:

using a thermal generator for heating a pressurized working fluid;

using a positive displacement expander, having a fixed expansion ratio, for receiving and expanding the heated and pressurized working fluid received from the thermal generator, against a reduced pressure sink in order to produce mechanical work;

using a receiver for receiving and separating a liquid part and a vapor part of the working fluid discharge which exits from the positive displacement expander;

using an absorber, and a chemosorption process, to absorb the vapor working fluid received from the receiver and to generate a reduced pressure sink at the exit of the expander;

using a desorber for heating and reconstituting the vapor working fluid from the absorbent liquid produced in the absorber, and provide a resultant vapor working fluid to the thermal generator for reuse;

using a pump for pressurizing and moving absorbent liquid produced in the absorber, as the result of the chemosorption process, to the desorber;

using a regenerator to recover heat energy contained in a liquid stream received from the desorber, to heat and vaporize the liquid part of the working fluid received from the receiver and provide a resultant vapor working fluid to the heat generator for reuse; and

using a pump to pressurize and transfer the liquid working fluid from the receiver to the regenerator.

3. A method for generating a mechanical energy at high efficiencies from an energy source, comprising the steps of:

using a thermal generator for heating a pressurized working fluid;

using a positive displacement expander, having a fixed expansion ratio, for receiving and expanding the heated and pressurized working fluid received from the thermal generator, against a reduced pressure sink in order to produce mechanical work;

using a receiver for receiving and separating a liquid part and a vapor part of the working fluid discharge which exits from the positive displacement expander;

using a condensing device to condense the vapor working fluid, as received from the receiver, and to generate a reduced pressure sink, at the exit or the expander;

using a vaporizer for heating and reconstituting the vapor working fluid from the condensed working fluid produced in the condensing device and providing a resultant vapor working fluid to the thermal generator for reuse;

using a pump for pressurizing and moving the condensed working fluid produced in the condensing device to the vaporizer;

using a regenerator to recover heat energy from the thermal generator exhaust gases to heat and vaporize the liquid part of the working fluid received from the receiver in order to provide a resultant vapor working fluid to the thermal generator for reuse; and

using a pump to pressurize and transfer the liquid working fluid from the receiver to the regenerator.

49. The method or apparatus as set forth in claims 3, 4, 7 or 8, further comprising using a low temperature condenser to condense the vapor working fluid and generate the reduced pressure, low pressure, or sub atmospheric sink

50. The method or apparatus as set forth in claims 3, 4, 7 or 8, further comprising using a compressor to condense the vapor working fluid and generate the reduced pressure, low pressure, or sub atmospheric sink.

51. The method or apparatus as set forth in claims 3, 4, 7 or 8, further comprising using a vacuum pump to condense the vapor working fluid and generate the reduced pressure, low pressure, or sub atmospheric sink.

52. The method or apparatus as set forth in claims 3, 4, 7 or 8, further compromising using a combination of a low temperature condenser, compressor, or vacuum pump to condense the vapor working fluid and generate the reduced pressure, low pressure, or sub atmospheric sink.

60. The method or apparatus as set forth in claims 3 or 9, further comprising using a vaporizer (a liquid to vapor heat exchanger) to vaporize the products produced by the condensing device and provide the resultant vapor to the thermal generator for reuse.

4. A method for regenerating mechanical energy at high efficiencies from an energy source, comprising the steps of:

using a thermal generator for heating a pressurized working fluid;

using a positive displacement expander, having a fixed expansion ratio, for receiving and expanding the heated and pressurized working fluid received from the thermal generator, against a reduced pressure sink in order to produce mechanical work;

using a receiver for receiving and separating a liquid part and a vapor part of the working fluid discharge which exits from the positive displacement expander;

using a condensing device to condense the vapor working fluid, as received from the receiver, and to generate a reduced pressure sink at the exit of the expander;

using a pump for moving the condensed working fluid produced by the compressor to the receiver;

using a regenerator to recover heat energy from the thermal generator exhaust gases to heat and vaporize the liquid part of the working fluid received from the receiver in order to provide a resultant vapor to the thermal generator for reuse; and

using a pump to pressurize and transfer the liquid working fluid from the receiver to the regenerator.

5. A method for generating a mechanical energy at high efficiencies from an energy source, comprising the steps of:

using a thermal generator for heating a pressurized working fluid;

using a positive displacement expander, having a fixed expansion ratio, for receiving and expanding the heated and pressurized working fluid received from the thermal generator, against a reduced pressure sink in order to produce mechanical work;

using a receiver for receiving and separating a liquid part and a vapor part of the working fluid discharge which exits from the positive displacement expander;

using a compressor to compress the vapor working fluid, as received from the receiver, and to generate a reduced pressure sink at the exit or the expander;

using a vaporizer for heating and reconstituting the vapor working fluid from the compressed working fluid and providing a resultant vapor working fluid to the thermal generator for reuse;

using a pump for pressurizing and moving the condensed working fluid produced in the condensing device to the vaporizer;

using a regenerator to recover heat energy from the thermal generator exhaust gases to heat and vaporize the liquid part of the working fluid received from the receiver in order to provide a resultant vapor working fluid to the thermal generator for reuse; and

using a pump to pressurize and transfer the liquid working fluid from the receiver to the regenerator.

6. A method for regenerating mechanical energy at high efficiencies from an energy source, comprising the steps of:

using a thermal generator for heating a pressurized working fluid;

using a positive displacement expander, having a fixed expansion ratio, for receiving and expanding the heated and pressurized working fluid received from the thermal generator, against a reduced pressure sink in order to produce mechanical work;

using a receiver for receiving and separating a liquid part and a vapor part of the working fluid discharge which exits from the positive displacement expander;

using a compressor to compress the vapor working fluid, as received from the receiver, and to generate a reduced pressure sink at the exit of the expander;

using a pump for moving the compressed working fluid produced by the compressor to the receiver;

using a regenerator to recover heat energy from the thermal generator exhaust gases to heat and vaporize the liquid part of the working fluid received from the receiver in order to provide a resultant vapor to the thermal generator for reuse; and

using a pump to pressurize and transfer the liquid working fluid from the receiver to the regenerator.

7. An apparatus for generating energy at high efficiencies from an energy source, comprising in combination:

a thermal generator for heating a pressurized working fluid;

a positive displacement expander, having a fixed expansion ratio, for receiving and expanding the heated and pressurized working fluid, as received from the thermal generator, against a reduced pressure sink in order to produce mechanical work;

a receiver for receiving and separating a liquid part and a vapor part of the working fluid discharge which exits from the positive displacement expander;

an absorber, and a chemosorption process, to absorb the vapor working fluid received from the receiver and to generate a reduced pressure sink at the exit of the expander;

a desorber for heating and reconstituting the vapor working fluid from the absorbent liquid produced in the absorber, and provide a resultant vapor working fluid to the thermal generator for reuse;

a pump for pressurizing and moving the absorbent liquid produced in the absorber, as the result of chemosorption, to the desorber;

a regenerator to recover heat energy contained in a liquid stream received from the desorber, to heat and vaporize the liquid part of the working fluid received from the receiver and provide a resultant vapor working fluid to the thermal generator for reuse; and

a pump to transfer the liquid working fluid from the receiver to the regenerator.

8. An apparatus for generating mechanical energy at high efficiencies from an energy source, comprising in combination:

a thermal generator for heating a pressurized working fluid;

a positive displacement expander, having a fixed expansion ratio, for receiving and expanding the heated and pressurized working fluid received from the thermal generator, against a reduced pressure sink in order to produce mechanical work;

a receiver for receiving and separating a liquid part and a vapor part of the working fluid discharge which exits from the positive displacement expander;

an absorber, and a chemosorption process, to absorb the vapor working fluid received from the receiver and to generate a reduced pressure sink at the exit of the expander;

a desorber for heating and reconstituting the vapor working fluid from the absorbent liquid produced in the absorber, and provide a resultant vapor working fluid to the thermal generator for reuse;

a pump for pressurizing and moving absorbent liquid produced in the absorber, as the result of the chemosorption process, to the desorber;

a regenerator to recover heat energy contained in a liquid stream received from the desorber, to heat and vaporize the liquid part of the working fluid received from the receiver and provide a resultant vapor working fluid to the heat generator for reuse; and

a pump to pressurize and transfer the liquid working fluid from the receiver to the regenerator.

9. An apparatus for generating mechanical energy at high efficiencies from an energy source, comprising in combination:

a thermal generator for heating a pressurized working fluid;

a positive displacement expander, having a fixed expansion ratio, for receiving and expanding the heated and pressurized working fluid received from the thermal generator, against a reduced pressure sink in order to produce mechanical work;

a receiver for receiving and separating a liquid part and a vapor part of the working fluid discharge which exits from the positive displacement expander;

a condensing device to condense the vapor working fluid, as received from the receiver, and to generate a reduced pressure sink, at the exit or the expander;

a vaporizer for heating and reconstituting the vapor working fluid from the condensed working fluid produced in the condensing device and providing a resultant vapor working fluid to the thermal generator for reuse;

a pump for pressurizing and moving the condensed working fluid produced in the condensing device to the vaporizer;

a regenerator to recover heat energy from the thermal generator exhaust gases to heat and vaporize the liquid part of the working fluid received from the receiver in order to provide a resultant vapor working fluid to the thermal generator for reuse; and

a pump to pressurize and transfer the liquid working fluid from the receiver to the regenerator.

10. An apparatus for generating mechanical energy at high efficiencies from an energy source, comprising in combination:

a thermal generator for heating a pressurized working fluid;

a positive displacement expander, having a fixed expansion ratio, for receiving and expanding the heated and pressurized working fluid received from the thermal generator, against a reduced pressure sink in order to produce mechanical work;

a receiver for receiving and separating a liquid part and a vapor part of the working fluid discharge which exits from the positive displacement expander;

a condensing device to condense the vapor working fluid, as received from the receiver, and to generate a reduced pressure sink at the exit of the expander;

a pump for moving the condensed working fluid produced by the compressor to the receiver;

a regenerator to recover heat energy from the thermal generator exhaust gases to heat and vaporize the liquid part of the working fluid received from the receiver in order to provide a resultant vapor to the thermal generator for reuse; and

a pump to pressurize and transfer the liquid working fluid from the receiver to the regenerator.

62. The method or apparatus as set forth in claims 3, 4, 9 or 10, wherein the condensing device comprises a vacuum pump and further comprising using a vaporizer to vaporize the products produced by the vacuum pump and provide the resultant vapor to the thermal generator for reuse.

11. An apparatus for generating a mechanical energy at high efficiencies from an energy source, comprising in combination:

a thermal generator for heating a pressurized working fluid;

a positive displacement expander, having a fixed expansion ratio, for receiving and expanding the heated and pressurized working fluid received from the thermal generator, against a reduced pressure sink in order to produce mechanical work;

a receiver for receiving and separating a liquid part and a vapor part of the working fluid discharge which exits from the positive displacement expander;

a compressor to compress the vapor working fluid, as received from the receiver, and to generate a reduced pressure sink at the exit or the expander;

a vaporizer for heating and reconstituting the vapor working fluid from the compressed working fluid and providing a resultant vapor working fluid to the thermal generator for reuse;

a pump for pressurizing and moving the condensed working fluid produced in the condensing device to the vaporizer;

a regenerator to recover heat energy from the thermal generator exhaust gases to heat and vaporize the liquid part of the working fluid received from the receiver in order to provide a resultant vapor working fluid to the thermal generator for reuse; and

a pump to pressurize and transfer the liquid working fluid from the receiver to the regenerator.

61. The method or apparatus as set forth in claims 5 or 11, further comprising the step of:

using a vaporizer to vaporize the products produced by the compressor and provide the resultant vapor to the thermal generator for reuse.

12. An apparatus for regenerating mechanical energy at high efficiencies from an energy source, comprising in combination:

a thermal generator for heating a pressurized working fluid;

a positive displacement expander, having a fixed expansion ratio, for receiving and expanding the heated and pressurized working fluid received from the thermal generator, against a reduced pressure sink in order to produce mechanical work;

a receiver for receiving and separating a liquid part and a vapor part of the working fluid discharge which exits from the positive displacement expander;

a compressor to compress the vapor working fluid, as received from the receiver, and to generate a reduced pressure sink at the exit of the expander;

a pump for moving the compressed working fluid produced by the compressor to the receiver;

a regenerator to recover heat energy from the thermal generator exhaust gases to heat and vaporize the liquid part of the working fluid received from the receiver in order to provide a resultant vapor to the thermal generator for reuse; and

a pump to pressurize and transfer the liquid working fluid from the receiver to the regenerator.