Northwest Natural Gas Company

Bechtel Power Corporation

Seyfettin Can Gulen

Roger Martin Haley

J Keith White

Sarah Sue Adams

David Alan Weber

David Allen Weber

In a gas turbine system including a first gas turbine generator, a heat recovery steam generator and a steam turbine generator heat rejection system, the present invention relates to a method for COcapture from flue gas in said system, said method including: (a) diverting an amount of heat recovery steam generator flue gas from the COcapture plant; and (b) mixing the diverted heat recovery steam generator flue gas with an air stream, forming a combined gas stream, wherein (1) the combined gas stream is fed to a second gas turbine generator; (2) exhaust gas from the second gas turbine generator is mixed with exhaust gas from the first gas turbine generator, forming a combined exhaust gas stream; and (3) the combined exhaust gas stream enters the heat recovery steam generator, with the COcontent of the combined exhaust gas stream increased through supplementary firing in the heat recovery steam generator.

Gas turbine combined cycle optimized for post-combustion COcapture

Embodiments provide systems and methods for taking power from an electric power grid and converting it into higher-pressure natural gas for temporary storage. After temporary storage, the higher-pressure natural gas may be expanded through an expansion engine to drive a generator that converts energy from the expanding natural gas into electrical power, which may then be returned to the electric power grid. In this way, the disclosed systems and methods may provide ways to temporarily store, and then return stored power from the electric power grid. Preferably, the components of the system are co-located at the same natural gas storage facility. This allows natural gas storage, electrical energy storage, and electrical energy generation to take place at the same facility.

System for compressed gas energy storage

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Middletown, MD, United States of America

Seyfettin Can Gulen