Chemistry: electrical current producing apparatus – product – and – Having magnetic field feature
Reexamination Certificate
2003-08-07
2004-11-23
Bell, Bruce F. (Department: 1746)
Chemistry: electrical current producing apparatus, product, and
Having magnetic field feature
C429S010000, C429S006000, C429S006000
Reexamination Certificate
active
06821663
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention generally relates to the fuel cells, and specifically to solid oxide regenerative fuel cells.
A solid oxide fuel cell (SOFC) is an electrochemical device that converts chemical energy directly into electrical energy. A Solid Oxide Regenerative Fuel Cell (SORFC) is an electrochemical device that converts chemical energy directly into electrical energy and subsequently reconverts electrical energy back to the original chemical energy. This device differs significantly from rechargeable batteries in that the chemicals are stored outside of the SORFC converter. The SORFC system has many building electrical energy storage applications that cannot be satisfied by batteries. For example, a SORFC system for building power generation is discussed in the Proceedings of the 2001 DOE Hydrogen Program Review NREL/CP-570-30535. The SORFC requires additional heat to vaporize stored water that will be electrolyzed during charge mode. This increases the cost and decreases the efficiency of the SORFC operation.
BRIEF SUMMARY OF THE INVENTION
In one preferred aspect of the present invention, there is provided a method of operating a regenerative fuel cell system, comprising providing a fuel and oxidizer into a fuel cell during discharge mode, storing waste heat generated by the fuel cell during the discharge mode, heating water using the stored waste heat during charge mode, and electrolyzing the heated water in the fuel cell during the charge mode.
In another preferred aspect of the present invention, there is provided a fuel cell system comprising a regenerative fuel cell and a heat storage material which is adapted to store waste heat from the fuel cell during discharge mode and which is adapted to heat water provided into the fuel cell for electrolyzation during charge mode.
REFERENCES:
patent: 4898792 (1990-02-01), Singh et al.
patent: 4983471 (1991-01-01), Reichner et al.
patent: 5047299 (1991-09-01), Shockling
patent: 5143800 (1992-09-01), George et al.
patent: 5169730 (1992-12-01), Reichner et al.
patent: 5170124 (1992-12-01), Blair et al.
patent: 5302470 (1994-04-01), Okada et al.
patent: 5441821 (1995-08-01), Merritt et al.
patent: 5498487 (1996-03-01), Ruka et al.
patent: 5510202 (1996-04-01), McCoy et al.
patent: 5527631 (1996-06-01), Singh et al.
patent: 5573867 (1996-11-01), Zafred et al.
patent: 5601937 (1997-02-01), Isenberg
patent: 5688611 (1997-11-01), Golben
patent: 5733675 (1998-03-01), Dederer et al.
patent: 5741605 (1998-04-01), Gillett et al.
patent: 6013385 (2000-01-01), DuBose
patent: 6042960 (2000-03-01), DaCosta et al.
patent: 6280865 (2001-08-01), Eisman et al.
patent: 6329090 (2001-12-01), McElroy et al.
patent: 6403245 (2002-06-01), Hunt
patent: 6436562 (2002-08-01), DuBose
patent: 6579638 (2003-06-01), Brassard
patent: 6586124 (2003-07-01), Kelley et al.
patent: 6592741 (2003-07-01), Nakanishi et al.
patent: 6610193 (2003-08-01), Schmitman
patent: 6620536 (2003-09-01), Strobel et al.
patent: 2002/0058175 (2002-05-01), Ruhl
Syntroleum, S-2 Synthetic Diesel, Driving Clean-Fuel Innovation, http://www.syntroleum.com/media/syntroleum_s2.pdf, no month/year available.
US 2003/0162067 A1, Published Aug. 28, 2003.
US 2003/0205641 A1, Published Nov. 6, 2003.
Cell and Stack Construction: Low-Temperature Cells, L.G. Austin, NASA SP-120, 1967, no month available.
Low Cost, High Efficiency Reversible Fuel Cell Systems, Proceedings of the 2002 U.S. DOE Hydrogen Program Review, NREL/CP-610-32405, no month available.
Low Cost Reversible Fuel Cell System, Proceedings of the 2000 U.S. DOE Hydrogen Program Review, Jun. 15, 2000, NREL/CP-570-28890.
Low Cost, Compact Solid Oxide Fuel Cell Generator, NASA Small Business Innovation Research Program, no month/year available.
Small, Ultra Efficient Fuel Cell Systems, Advanced Technology Program ATP 2001 Competition (Jun. 2002).
Low Cost, High Efficiency Reversible Fuel Cell (and Electrolyzer) Systems, Proceedings of the 2001 DOE Hydrogen Program Review NREL/CP-570-30535, no month available.
Regenerative Fuel Cells for High Altitude Long Endurance Solar Powered Aircraft, F. Mitlitsky, et al, 28thIntersociety Energy Conversion Engineering Conference (IECEC), Jul. 28, 1993, UCRL-JC-113485.
Unitized Regenerative Fuel Cells for Solar Rechargeable Aircraft and Zero Emission Vehicles, F. Mitlitsky, et al, 1994 Fuel Cell Seminar, Sep. 6, 1994, UCRL-JC-117130.
www.synetix.com/methanol/pdfs/general/shortlpm.pdf Synetix Low Pressure Methanol (LPM) Process, no month/year available.
Flouride Salts as Phase Change Materials for Thermal Energy Storage in the Temperature Range 1000-1400 K, Thermal Analysis and Heat of Fusion Measurements, Ajay K. Misra,J. Electrochem. Soc.: Electrochemical Science and Technology, vol. 135, No. 4, Apr. 1988.
Enthalpy of Fusion, 6-128 through 6-136, CRC Handbook of Chemistry and Physics, 77thEdition, D.R. Lide editor-in-chief, 1996-1997, no month available.
Chemistry: WebElements Periodic Table, pp. 1-2. www.webelements.com, no month/year available.
Finn John
Gottmann Matthias
McElroy James
Mitlitsky Fred
Bell Bruce F.
Foley & Lardner LLP
Ion America Corporation
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