Simulation of an oxygen membrane-based combined cycle power plant: part-load operation with operational and material constraints
authors Colombo, KE; Bolland, O; Kharton, VV; Stiller, C
nationality International
journal ENERGY & ENVIRONMENTAL SCIENCE
keywords GAS-TURBINE; CATALYTIC COMBUSTION; PARTIAL OXIDATION; CO2 CAPTURE; PERFORMANCE EVALUATION; EJECTOR PERFORMANCE; CONDUCTING MEMBRANE; METHANE; SYSTEMS; GENERATION
abstract This paper presents the design and part-load performance of a natural gas-fired oxy-combustion combined cycle power plant for CO2 capture. The combustion chamber of a conventional gas turbine was replaced by a membrane reactor, making it possible to obtain a highly concentrated CO2 stream for long-term storage. The focus was on power plant operation with a view to operational and material constraints of individual process components to ensure their proper performance and required lifetime. In this respect, the mixed-conducting membrane modules were of particular interest. Temperature as well as concentration limitations for CO2 and other chemical species narrowed the operating window. Other critical reactor components added further constraints. For part-load operation of the power plant, two load control strategies were analysed for the gas turbine operating at constant rotational speed. In the first load control strategy, variable guide vanes were used to manipulate the mass flow of air to the gas turbine compressor. This degree of freedom was used to control the turbine exit temperature. In the second 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 its design value, which led to improved stability. The load-control strategy using variable guide vanes was superior to the strategy without variable guide vanes due to higher combined cycle efficiencies and increased load-reduction capability. Moreover, the performance of the catalytic combustors in the membrane reactor, operating at near stoichiometric conditions, also improved as a result of increased oxygen concentrations at part-load operation. Relevant process components were based on spatially distributed conservation balances for energy, species, mass, and momentum. A stability diagram was incorporated into the membrane module model to investigate the risk of degradation. Performance maps were used for turbomachinery components.
publisher ROYAL SOC CHEMISTRY
issn 1754-5692
year published 2009
volume 2
issue 12
beginning page 1310
ending page 1324
digital object identifier (doi) 10.1039/b910124a
web of science category Chemistry, Multidisciplinary; Energy & Fuels; Engineering, Chemical; Environmental Sciences
subject category Chemistry; Energy & Fuels; Engineering; Environmental Sciences & Ecology
unique article identifier WOS:000272036300010
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journal analysis (jcr 2017):
journal impact factor 30.067
5 year journal impact factor 28.924
category normalized journal impact factor percentile 99.105
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