Journal
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
Volume 158, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jaap.2021.105273
Keywords
Biomass pyrolysis; Kinetic analysis; Thermodynamics analysis; Product characteristics; Infrared heated
Funding
- National Modern Agricultural Industrial Technology System [CARS-03-40]
- National Natural Science Foundation of China [U19B2009]
- Fundamental Research Funds of Chongqing City [CX2019125]
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This study focuses on the pyrolysis of corn stover using an innovative infrared heated reactor to produce high-value bio-oil and gaseous products. The results show that infrared heating technology effectively suppresses secondary reactions, leading to higher bio-oil yield compared to electric heating technology. Bio-oil yield increases initially with temperature and then decreases, reaching a maximum at 550 degrees C.
High-value bio-oil and gaseous products can be produced by pyrolysis of corn stover. This work presents a systematic study on pyrolysis characteristics of corn stover using an innovative infrared heated pyrolysis reactor. Firstly, the analytical pyrolysis was performed in a thermogravimetric (TG) analyzer at 10, 20, 30 and 40 degrees C/min to investigate the thermal degradation behaviors, and the pyrolysis kinetics and thermodynamics parameters were calculated. The activation energies calculated by FWO and KAS method were 19.61-38.33 kJ/mol and 11.40-29.51 kJ/mol respectively at conversion fractions (alpha) ranging from 0.2 to 0.8, and the one-dimensional diffusion (D1) has the highest fitting degree. The infrared heated technology effectively suppressed the secondary reaction of primary volatiles, and it presented a higher bio-oil yield than electrically heated technology, and as a result, the char and gas yields had a lower value. In both reactors, the yield of bio-oil increases at first and then decreases with the increase in temperature, and the bio-oil yield of the infrared heated furnace and electrically heated furnace reaches the maximum value at 550 degrees C and 500 degrees C, which are 34.34 wt.% and 26.40 wt.%, respectively. The acids content of bio-oil decreased gradually with the temperature increased in the infrared heated reactor. The yield of phenolic compounds in bio-oil was higher in the former than in the latter, at 19.36 % and 14.86 %, respectively. The infrared heated reactor has superior performance in producing high quality bio-oils compared to conventional electric heating methods and may be considered as a promising biomass conversion technique.
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