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Co-pyrolysis kinetics and behaviors of kitchen waste and chlorella vulgaris using thermogravimetric analyzer and fixed bed reactor

Chen, Lin, Yu, Zhaosheng, Fang, Shiwen, Dai, Minquan, Ma, Xiaoqian
Energy conversion and management 2018 v.165 pp. 45-52
Chlorella vulgaris, activation energy, carbon dioxide, carboxylic acids, gas chromatography-mass spectrometry, hydrocarbons, kitchen waste, liquids, mixing, pyrolysis, pyrolysis oils, temperature, thermogravimetry
Co-pyrolysis of CV and KW under CO2 atmosphere were studied in this paper. The pyrolysis characteristics were investigated by thermogravimetric analysis and the kinetic parameters were calculated by Ozawa-Flynn-Wall and the Kissinger-Akahira-Sunose methods. Results showed that with the increase of mixing degree, the averaged apparent activation energy (Eave) increased evidently, the 50%CV50%KW sample showed the highest Eave (234.43 kJ/mol (OFW) and 228.21 kJ/mol (KAS)). Yields of liquid, solid and gas at different pyrolysis temperature and blends were obtained by a lab-scale fixed bed reactor. Both KW and CV had the highest bio-oil yield at 600 °C in the range of 500–700 °C. Mixing KW and CV deteriorated the bio-oil yield but improved higher heating value of the bio-oil product (33.9 MJ/kg at 600 °C in 5:5 ratios). The gas chromatography-mass spectrometry analysis of bio-oil product further found that co-pyrolysis of CV and KW could decrease carboxylic acids and increased hydrocarbons of bio-oil products. In brief, co-pyrolysis of CV and KW could be a potential way for improving quality and calorific value of pyrolysis oil.