Fast pyrolysis of fermentation residue derived from Saccharina japonica for a hybrid biological and thermal process

Jae Hyung Choi, Seung-Soo Kim, Jinsoo Kim and Hee Chul Woo

Energy, 2019, vol. 170, issue C, 239-249

Abstract: Pyrolysis characteristics of Saccharina japonica fermentation residue (SJFR) were systematically investigated using a thermogravimetric analyzer and a bubbling fluidized-bed reactor. Thermogravimetric (TG) characteristics of the SJFRs with increasing fermentation time (1–6 day) showed a decrease of second peak related to fermentable carbohydrates (e.g., alginate and fucoidan) and an increase of third peak related to non-fermentable carbon sources. The calculated apparent activation energy of the SJFRs ranged from 20.21 to 295.46 kJ/mol, depending on the conversion rate of 5–80%. Between 10 and 40% conversion at 225–310 °C, the apparent activation energies of the SJFRs on each conversion decreased with increasing the fermentation time (1–6 day). The bubbling fluidized-bed pyrolysis of the SJFR-4D and -6D showed the high bio-oil yield of 39.86 and 40.12 wt%, respectively at 375 °C and 4.0 × Umf, and the HHVs of the organic bio-oils were 28.95–29.34 MJ/kg. The characteristics of the bio-oil derived from SJFRs were analyzed by GC-MS and the TG-based simulated distillation. The fractions of gas oil and heavy gas oil were increased, whereas the one of gasoline decreased with increasing fermentation time. It is attributed to a decrease of the fermented carbohydrates (e.g., alginate and fucoidan) related to the gasoline fraction.

Keywords: Bubbling fluidized-bed pyrolysis; Anaerobic fermentation residue; Saccharina japonica; Bio-oil; Bio-char (search for similar items in EconPapers)
Date: 2019
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Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:170:y:2019:i:c:p:239-249

DOI: 10.1016/j.energy.2018.12.136

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