Reduction of greenhouse gas emissions, and in particular of CO2 emitted from human activities like power
generation, is one of the most important challenges for our modern society. This paper presents an analysis of an
advanced power cycle with limited CO2 emissions, based on the use of Molten Carbonate Fuel Cells (MCFC) for
post-combustion capture of CO2 integrated within a natural gas fuelled gas-steam combined cycle (NGCC) power
plant. The application of post combustion capture, with respect to other capture strategies, has the advantage to
require limited change to the cycle arrangement so that it can be easily adapted to retrofit existing power plants. On
the other hand, CO2 concentration in NGCC exhaust gases is rather low (about 4%), and conventional post-combustion capture concepts typically require the adoption of chemical solvents (amines) to absorb carbon dioxide
before the stack. The adoption of such “passive” CO2 capture processes yields up to 90% carbon dioxide removal
but brings about the disadvantage of reducing considerably the plant power output and efficiency, due to the huge
amount of thermal energy required to regenerate the chemical solvents. As a matter of fact, because of plant power
output reduction consequences of CO2 capture, the installation of additional power plants must be taken into
account, and depending on their type (either based on other CO2 capture power plants or representative of average
power stations), this could partially offset the CO2 reduction gained on the NGCC.
Reduction of greenhouse gas emissions, and in particular of CO2 emitted from human activities like power
generation, is one of the most important challenges for our modern society. This paper presents an analysis of an
advanced power cycle with limited CO2 emissions, based on the use of Molten Carbonate Fuel Cells (MCFC) for
post-combustion capture of CO2 integrated within a natural gas fuelled gas-steam combined cycle (NGCC) power
plant. The application of post combustion capture, with respect to other capture strategies, has the advantage to
require limited change to the cycle arrangement so that it can be easily adapted to retrofit existing power plants. On
the other hand, CO2 concentration in NGCC exhaust gases is rather low (about 4%), and conventional post-combustion capture concepts typically require the adoption of chemical solvents (amines) to absorb carbon dioxide
before the stack. The adoption of such “passive” CO2 capture processes yields up to 90% carbon dioxide removal
but brings about the disadvantage of reducing considerably the plant power output and efficiency, due to the huge
amount of thermal energy required to regenerate the chemical solvents. As a matter of fact, because of plant power
output reduction consequences of CO2 capture, the installation of additional power plants must be taken into
account, and depending on their type (either based on other CO2 capture power plants or representative of average
power stations), this could partially offset the CO2 reduction gained on the NGCC.
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