In Case 3, CHP reduces total net fuel consumption by 55 percent; CO2 emission reductions from displacing central station power exceed the CO2 emissions at the plant itself, resulting in negative net CO2 emissions for the CHP system compared with base case conditions.
~~ ~~
Case 3: Gas turbine/steam turbine with power export (combined cycle)—Thermal output sized to meet plant steam load without supplemental firing; steam turbine added to generate additional power from high-pressure steam before going to process; maximum power generated for export.
~~ ~~ ... In the two natural gas CHP cases with excess power available for export (Cases 2 and 3), the displaced central station fuel represents a significant credit against increased fuel use at the plant. The total fuel savings for Cases 2 and 3 are 44 percent and 55 percent, respectively, over the natural gas base case.
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