Acid-Catalyzed Wet Torrefaction for Enhancing the Heating Value of Barley Straw

Energies

Panagiotis Grammelis¹  Elias Sakellis²  Antonios Nazos³  Dimitrios Sidiras³ 

[1] Chemical Process and Energy Resources Institute (CERTH/CPERI), Centre for Research & Technology Hellas, Athens branch: Egialias 52, GR-15125 Marousi, Athens, Greece;Institute of Nanoscience and Nanotechnology, National Centre for Scientific Research “Demokritos”, GR-15310 Agia Paraskevi Attikis, Athens, Greece;Laboratory of Simulation of Industrial Processes, Department of Industrial Management and Technology, School of Maritime and Industrial Studies, University of Piraeus, 80 Karaoli & Dimitriou, GR 18534 Piraeus, Greece;

关键词: acid-catalyzed wet torrefaction;    acid hydrolysis;    barley straw;    combined severity factor;    enhancement factor;    energy yield;   

DOI  :  10.3390/en13071693

来源: DOAJ

【 摘 要 】

In the present study, the possibility of improving the higher heating value (HHV) of lignocellulosic biomass, especially barley straw, was examined. The research deals with the treatment of barley straw by acid-catalyzed wet torrefaction (ACWT), also called acid hydrolysis, in a batch reactor (autoclave) Parr 4553 3.75 L. In this case, two different simulation approaches were applied: (i) combined severity factor (CSF) and (ii) response surface methodology (RSM) based on Box–Behnken design of experiments (DoE). Sulfuric acid (SA) concentration, temperature and time were the ACWT parameters examined herein. An oxygen bomb calorimeter was used for the HHV measurement. The findings indicated that the composition changes of the straw due to ACWT had a significant effect on the HHV of the pretreated material. In this study, treatment conditions were 10–35 mM SA, 160–200 °C and an isothermal reaction time 0–40 min (preheating period not included in these values). In conclusion, there was a significant increase in the HHV up to 24.3 MJ/kg for the ACWT barley straw, compared to 17.5 MJ/kg for the untreated straw, at optimal conditions of 200 °C for 25 min (isothermal period) and 35 mM SA. This resulted in a 1.39 enhancement factor (EF) and 68% energy yield (EY).

【 授权许可】

Unknown