The
strengthening carbon mitigation efforts to meet the 1.5 °C
target requires the development of zero/negative CO2 emission
technologies to eliminate large direct CO2 emissions from
fossil-fuel fired power stations. Amine scrubbing is a dominant technology
to capture CO2 from fossil-fuel power stations, but its
application in achieving zero/negative emission in power stations
is rarely reported. The present study investigates the MEA-based technologies
to achieve zero and negative CO2 emission in coal-fired
power stations, and their techno-economic performance was evaluated
in detail. These zero/negative-emission technologies include 99.7%
CO2 capture from flue gas (zero emission), biomass cocombustion
with coal integrated with CO2 capture at ratios of 10%
biomass/90% CO2 capture and 5% biomass/95% CO2 capture (zero-emission), and 10% biomass/95% CO2 capture
for negative-emission power station. Our investigation revealed that
these zero/negative-emission technologies are technically and economically
viable, and their CO2 avoided costs did not significantly
increase compared to the standard 90% CO2 capture. The
CO2 avoided cost for 99.7%-capture is estimated at $66.5/tonne
CO2, which is $2.6/tonne CO2 higher than that
of 90%-capture. The biomass cocombustion zero/negative-emission technologies
show better economic performance with CO2 avoided cost
of $64.1–64.8/tonne CO2, which is only $0.2–0.7/tonne
CO2 higher than the standard 90%-capture. These results
indicate that the amine-based CO2 capture integrated with
biomass cocombustion technology would be economically competitive
to achieve zero or even negative CO2 emissions in coal-fired
power stations.
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