Carbon dioxide production from carbonate fuel cells

A method of extracting carbon dioxide in a fuel cell system, the method comprising:

• receiving, by a first fluid pathway, fuel exhaust from fuel electrodes of a fuel cell stack, the fuel cell stack comprising a plurality of fuel cells, the plurality of fuel cells comprising air electrodes and the fuel electrodes;
• receiving, by a second fluid pathway, a first portion of the fuel exhaust from the first fluid pathway;
• receiving, by a third fluid pathway, a second portion of the fuel exhaust from the first fluid pathway;
• receiving, by a carbon processing unit, the first portion of the fuel exhaust from the second fluid pathway;
• removing, by the carbon processing unit, a first portion of carbon dioxide (CO2) from the first portion of the fuel exhaust;
• outputting, by the carbon processing unit, a remainder of the first portion of the fuel exhaust containing a second portion of CO2 and hydrogen;
• receiving, by an air combination unit, the second portion of the fuel exhaust from the third fluid pathway;
• combining, by the air combination unit, the second portion of the fuel exhaust with air;
• and
• providing, by the air combination unit, a mixture of the second portion of the fuel exhaust to the air electrodes within the fuel cell stack.