Comparison of corn straw biochars from electrical pyrolysis and microwave pyrolysis. Issue 1 (31st December 2023)

• Record Type: Journal Article
• Authors: Qiu, Tianhao; Liu, Chaoyue; Cui, Longfei; Liu, Hui; Muhammad, Kashif; Zhang, Yaning
• Is Part Of: Energy sources. Volume 45:Issue 1(2023)
• Page Start: 636
• Page End: 649
• Publication Date: 2023-12-31
• Subjects: Microwave pyrolysis -- electrical pyrolysis -- corn straw -- biochar -- yield -- pore structure; Natural resources -- Periodicals; Energy consumption -- Periodicals; Energy consumption -- Climatic factors -- Periodicals; Energy conversion -- Periodicals; Energy conversion -- Environment aspects -- Periodicals; Power (Mechanics) -- Periodicals; 333.7905
• DOI: 10.1080/15567036.2023.2172484
• Languages: English
• ISSNs: 1556-7036

Abstract

ABSTRACT: In this study, biochar production from electrical pyrolysis and microwave-assisted pyrolysis of corn straw was detailed. The yields and surface topographies of biochars produced from electrical pyrolysis and microwave pyrolysis at different pyrolysis temperatures (700, 750, 800, 850, and 900°C), biomass loads (9, 12, 15, 18, and 21 g), and residence times (60, 90, 120, 150, and 180 min) were elaborated in the study. The results showed that the biochar yields were in the range of 21.14–38.7 wt. %, and they gradually decreased when there were decreases in the biomass loads or increases in the pyrolysis temperatures or residence times. Increases in pyrolysis temperatures and residence times or decreases in biomass loads increased the porosity and pore densities and reduced the pore sizes. As compared with electrical pyrolysis, microwave pyrolysis increased the bochar yields, i.e. by 21.24% at 800°C, 180 min, and 15 g (21.4 wt. % vs. 25.3 wt. %). Biochar produced from electrical pyrolysis had heterogeneous pore size distribution, whereas biochar obtained from microwave pyrolysis had identical sizes and round shapes on its surface. This study quantitatively revealed the relationships between biochar yields and experimental conditions (pyrolysis temperature, biomass load, residence time).