Zero emission natural gas power and liquefaction plant

Details Zero emission natural gas power and liquefaction plant Zero emission natural gas power and liquefaction plant

2006-12-27

2009-10-27

Nguyen, Hoang M (Department: 3748)

Power plants

Utilizing natural heat

Geothermal

C060S641300

Reexamination Certificate

active

07607303

ABSTRACT:
A zero-emissions power plant receives natural gas from wells at elevated pressure and temperature. Gas is expanded through one or more turbo-expanders, preferably reformed, and sent to a fuel cell where electricity, heat, carbon-dioxide, and water are generated. The carbon-dioxide is compressed by at least one compressor and piped downhole for sequestration. The turbo-expanders have shafts which preferably share the shafts of the compressors. Thus, energy given up by the natural gas in the turbo-expanders is used to run compressors which compress carbon dioxide for downhole sequestration. In one embodiment, the natural gas is applied to heat exchangers in order to generate a stream of liquid natural gas. The remainder of the gas is expanded through the turbo-expanders and processed in the reformer prior to being sent to the fuel cell. A shifter may be used between the reformer and fuel cell. A solid oxide fuel cell is preferred.

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EG&G Technical Services, Inc. “Fuel Cell Handbook”, Chapter 7, “Solid Oxide Fuel Cells”, pp. 7-1-7-49, U.S. Department of Energy, Nov. 2004.
Wagner et al., “Steam reforming analyzed”, Hydrocarbon Processing, pp. 69-77, Jul. 1992.

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