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Simulation of a NGCC Power Generation Plant for the Production of Electricity from CO2 Emissions Part II: SNGCC Power Plant

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Document pages: 10 pages

Abstract: The objective of the first part of the investigation was to use AspenPlus software and the Redlich-Kwong-Soave equation of state in order tosimulate an adiabatic methanation reactor for the production of syntheticnatural methane (SNG) using 1 kg hr ofcarbon dioxide. In this paper, we define the Synthetic Natural Gas CombinedCycle (SNGCC) as a combined cycle power plant where the fuel is syntheticnatural gas (SNG) produced by a methanation reactor. The feed of themethanation reactor is the recycled stream of carbon dioxide of a CO2 capture unit treating the flue gas of the SNGCC power plant. The objective ofthe second part of the investigation is the utilization of Aspen plus softwarewith SRK equation of state for the simulation of the SNGCC power plant. Themetallurgical limitation of the gas turbine was fixed at 1300°Cin this investigation. For effective absorption by amine solutions, the molarpercentage of CO2 in the flue gas should be higher than10 . Moreover, in order to reduce technical problems linked to oxidativedegradation of amine in the CO2 capture plant, thepercentage of O2 in the flue gas should also be lowerthan 5 . To reach this goal, the primary air for combustion has 10 excess air(compared to stoichiometric air) and 37 of the flue gas leaving the SNGCC is recirculated as the secondary air for coolingthe turbine. As a result, the concentration of CO2 and O2 of theflue gas entering the CO2 capture unit were respectivelyequal to 10.2 and 2.01 . The simulation results of the SNGCC power plantindicate that 6.6 MJ of electricity are produced for each kg of carbon dioxiderecycled from the CO2 capture unit of the power plant.In other terms, the production of the 24.88 kg hr ofsynthetic natural gas (SNG) consumes 62.36 kg hr ofrecycled carbon dioxide and 16.4 kg hr ofhydrogen. The SNG produced by the methanation reactor of the power plantgenerates 114 kW of electricity. It is assumed in this paper that the hydrogenneeded for the methanation of carbon dioxide is a product of a catalyticreforming plant that produces gasoline from heavy naphta fraction of anatmospheric distillation unit of crude oil.

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