General Electric Company

Statoil Asa

Statoil

Arne Lynghjem

Jon Jakobsen

Michael Adam Bartlett

Matthias Finkenrath

Henrik Kobro

Arnfinn Lund

Power plants and process for lowering COemissions generally includes extracting a portion of the recirculated CO-rich flue gas mid-way through the compression pathway of a gas turbine and removing the COin a separation unit. The remaining portion of the COrich flue gas (i.e., the portion of the recirculated flue gas that was not fed to the separation unit) is mixed with fresh air coming from an additional compressor-expander and then fed back to the compression pathway. As a result, flue gas recirculation increases the COconcentration within the working fluid, leading to an additional increase in COpartial pressure. As the concentration and partial pressure of COis increased, a lower energy penalty is observed to remove the CO. Moreover, a reduced volume is fed to the COseparation unit during operation. Consequently, the size of the separation equipment can be reduced as well as the energy required for the separation process.

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The invention relates to a method for inter alia to increase the energy and cost efficiency of a gas power plant or a thermal heat plant with COcapturing. The power plant comprises gas turbine plants (') comprising compressor units (&#x2032;) and turbine units (&#x2032;) and further comprises a combustor (). The combustor () is working in principle with to separate gas part streams where one gas part stream flows internally through the flame tube () of the combustor (), while the other gas part stream is flowing along the exterior of the flame tube (). The first gas part stream comprises additional air and re-circulated, un-cleaned flue gas from the combustor (), said gases being combusted together with fuel inside the flame tube (). The second gas part stream comprises cleaned flue gas which is heated up at the exterior of the flame tube () while the flame tube () is cooled down. The invention comprises also a power plant, a combustor and a COcapture plant.

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Stavanger, Norway

Arne Lynghjem