Abstract
In this study, two fermentation-pyrolysis pathways for cellulosic ethanol production were established to improve the economy of cellulosic ethanol plants by lignin-rich residue pyrolysis. Techno-economic assessment (TEA) was conducted for both novel pathways compared with conventional fermentation-combustion pathway based on biomass Arundo donax. Pathway simulation showed that compared with the fermentation-combustion pathway, fermentation-pyrolysis pathway produced extra bio-char and hydrocarbon fuels except 256,000 m3 of ethanol each year. Economic analysis showed that the Minimum Ethanol Selling Price (MESP) of fermentation-combustion pathway was 1.623$/gal. The MESP of fermentation-pyrolysis A pathway and fermentation-pyrolysis B pathway was 1.673$/gal and 1.494$/gal respectively. The MESP of fermentation-pyrolysis B pathway indicated a potential process of lignin pyrolysis applied in cellulosic ethanol plants in the future. Sensitivity analysis indicated that price change of A. donax and plant scale both have a great impact on the MESP.
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