Cost and Life Cycle Emissions of Ethanol Produced with an Oxyfuel Boiler and Carbon Capture and Storage.

Autor:	Dees J; Energy and Resources Group, University of California, Berkeley, 345 Giannini Hall, Berkeley, California 94720, United States., Oke K; Department of Chemical and Petroleum Engineering, University of Calgary, 750 Campus Dr NW, Calgary, AB T2N 4H9, Canada., Goldstein H; Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, United States., McCoy ST; Department of Chemical and Petroleum Engineering, University of Calgary, 750 Campus Dr NW, Calgary, AB T2N 4H9, Canada., Sanchez DL; Environmental Science, Policy, and Management (ESPM), University of California, Berkeley, 130 Mulford Hall #3114, Berkeley, California 94720, United States., Simon AJ; Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, United States., Li W; Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, United States.
Jazyk:	angličtina
Zdroj:	Environmental science & technology [Environ Sci Technol] 2023 Apr 04; Vol. 57 (13), pp. 5391-5403. Date of Electronic Publication: 2023 Mar 21.
DOI:	10.1021/acs.est.2c04784
Abstrakt:	Decarbonization of transportation fuels represents one of the most vexing challenges for climate change mitigation. Biofuels derived from corn starch have offered modest life cycle greenhouse gas (GHG) emissions reductions over fossil fuels. Here we show that capture and storage of CO 2 emissions from corn ethanol fermentation achieves ∼58% reduction in the GHG intensity (CI) of ethanol at a levelized cost of 52 $/tCO 2 e abated. The integration of an oxyfuel boiler enables further CO 2 capture at modest cost. This system yields a 75% reduction in CI to 15 gCO 2 e/MJ at a minimum ethanol selling price (MESP) of $2.24/gallon ($0.59/L), a $0.31/gallon ($0.08/L) increase relative to the baseline no intervention case. The levelized cost of carbon abatement is 84 $/tCO 2 e. Sensitivity analysis reveals that carbon-neutral or even carbon-negative ethanol can be achieved when oxyfuel carbon capture is stacked with low-CI alternatives to grid power and fossil natural gas. Conservatively, fermentation and oxyfuel CCS can reduce the CI of conventional ethanol by a net 44-50 gCO 2 /MJ. Full implementation of interventions explored in the sensitivity analysis would reduce CI by net 79-85 gCO 2 /MJ. Integrated oxyfuel and fermentation CCS is shown to be cost-effective under existing U.S. policy, offering near-term abatement opportunities.
Databáze:	MEDLINE
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