abstract
This Paper investigates the transient behavior of a natural gas-fired power plant for CO2 capture that incorporates mixed-conducting membranes for integrated air separation. The membranes are part of a reactor system that replaces the combustor in a conventional gas turbine power plant. A highly concentrated CO2 stream call then be produced. The membrane Modules and beat exchangers in the membrane reactor were based on spatially distributed parameter models. For the turbomachinery components, performance maps were implemented. Operational and material Constraints were emphasized to avoid process conditions that could lead to instability and extensive stresses. Two load-control strategies were considered for the power plant with a gas turbine operating Lit constant rotational Speed. In the first load-control strategy, variable guide vanes in the gas turbine compressor were used to manipulate the mass flow of air entering the gas turbine compressor, This degree of freedom was used to control the turbine exit temperature. In the second load-control strategy, variable guide vanes were not used, and the turbine exit temperature was allowed to vary. For both load-control strategies, the mean solid-wall temperature of the membrane modules was Maintained Close to the design value. Simulation reveals that the membrane-based gas turbine power plant exhibits rather slow dynamics; fast load following was hence difficult while maintaining stable operation. Comparing the two load-control strategies, load reduction with variable air flow rate and Controlled turbine exit temperature Was Found to be superior because Of the considerably higher and faster load reduction capability, increased stability of the catalytic combustors ill the membrane reactor, and higher power plant efficiencies.
keywords
OXIDE FUEL-CELL; CATALYTIC PARTIAL OXIDATION; COMBINED-CYCLE; HYBRID SYSTEM; CONDUCTIVITY RELAXATION; PERFORMANCE EVALUATION; EJECTOR PERFORMANCE; SYNGAS PRODUCTION; CO2 CAPTURE; METHANE
subject category
Energy & Fuels; Engineering
authors
Colombo, KE; Kharton, VV; Bolland, O
our authors
Vladislav Kharton
Invited Principal ResearcherGroups
acknowledgements
This publication forms it part of the BIG-CO2 project, which has been funded wider the strategic Research Council of Norway programme called Climit. The authors acknowledge the partners for their support: StatoilHydro, GE Global Research, Statkraft, Aker Clean Carbon, Shell, TOTAL, ConocolPhillips, ALSTOM, the Research Council of Norway (178004/130 and 176059/130), Gassnova (182070) and FCT, Portugal (PTDC/CTM/64357/2006).