Techno-economic feasibility of a biomass-to-X plant: Fischer-Tropsch wax synthesis from digestate gasification

Marchese, MarcoPolitecn Torino, Dept Energy, Corso Duca Abruzzi 24, Turin, Italy. (author)

Techno-economic feasibility of a biomass-to-X plant : Fischer-Tropsch wax synthesis from digestate gasification

QC 20210629
A techno-economic analysis is performed, assessing the production costs of Fischer-Tropsch syncrude and waxes of carbon number C20+. The products are obtained from the gasification of digestate from anaerobic digestion inside a dual fluidized bed gasifier (3.11 MWth). The results are compared against the same system fed with lignocellulosic biomass. The syngas is cleaned from impurities and conditioned to reach the desired H-2/CO molar ratio of 1.8 at the inlet of the Fischer-Tropsch reactor. The Fischer-Tropsch products distribution is based on experimental data of a cobalt-based catalyst. Two process configurations are studied: (1) the Fischer-Tropsch off-gas are employed to produce electricity; (2) the off-gas are recirculated to the gasifier for enhanced wax production. Co-production of steam is also investigated. The results show an advantageous production of Fischer-Tropsch compounds utilizing digestate over wood biomass. The highest plant efficiency (i.e., biomass-to-liquid fuel) of 56.3% is reached with digestate feedstock and off-gas recirculation, outputting 61.5 kg(wax)/t(dig). The minimum wax production cost is of 3.04 (sic)/kg(wax), assuming 7.5% discount rate and 25-years plant operation.

Chesta, SimonePolitecn Torino, Dept Energy, Corso Duca Abruzzi 24, Turin, Italy. (author)
Santarelli, MassimoKTH,Kraft- och värmeteknologi,Politecn Torino, Dept Energy, Corso Duca Abruzzi 24, Turin, Italy.;Royal Inst Technol KTH, Energy Dept, Brinellvagen 68, SE-10044 Stockholm, Sweden.(Swepub:kth)u1860f9q (author)
Lanzini, AndreaPolitecn Torino, Dept Energy, Corso Duca Abruzzi 24, Turin, Italy. (author)
Politecn Torino, Dept Energy, Corso Duca Abruzzi 24, Turin, Italy.Kraft- och värmeteknologi (creator_code:org_t)

By the author/editor: Marchese, Marco; Chesta, Simone; Santarelli, Mass ...; Lanzini, Andrea

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ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Mechanical Engin ...; and Energy Engineeri ...

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