Achieving Zero/Negative-Emissions Coal-Fired Power Plants Using Amine-Based Postcombustion CO_2 Capture Technology and Biomass Cocombustion

摘要

The strengthening carbon mitigation efforts to meet the 1.5 ℃ target requires the development of zeroegative CO_2 emission technologies to eliminate large direct CO_2 emissions from fossil-fuel fired power stations. Amine scrubbing is a dominant technology to capture CO_2 from fossil-fuel power stations, but its application in achieving zeroegative emission in power stations is rarely reported. The present study investigates the MEA-based technologies to achieve zero and negative CO_2 emission in coal-fired power stations, and their techno-economic performance was evaluated in detail. These zeroegative-emission technologies include 99.7% CO_2 capture from flue gas (zero emission), biomass cocombustion with coal integrated with CO_2 capture at ratios of 10% biomass/90% CO_2 capture and 5% biomass/95% CO_2 capture (zero-emission), and 10% biomass/95% CO_2 capture for negative-emission power station. Our investigation revealed that these zeroegative-emission technologies are technically and economically viable, and their CO_2 avoided costs did not significantly increase compared to the standard 90% CO_2 capture. The CO_2 avoided cost for 99.7%-capture is estimated at $66.S/tonne CO_2, which is $2.6/tonne CO_2 higher than that of 90%- capture. The biomass cocombustion zeroegative-emission technologies show better economic performance with CO_2 avoided cost of $64.1-64.8/tonne CO_2, which is only $0.2-0.7/tonne CO_2 higher than the standard 90%-capture. These results indicate that the amine-based CO_2 capture integrated with biomass cocombustion technology would be economically competitive to achieve zero or even negative CO_2 emissions in coal-fired power stations.