Results of Comparative Studies of Treatment Processes of Some Types of Biomass by Wet and Oxidative Torrefaction Methods

• Published in: Chemical and petroleum engineering Vol. 58; no. 7-8; pp. 581 - 587
• Main Authors: Kuzmin, S. N., Isemin, R. L., Mikhalev, A. V., Milovanov, O. Yu, Klimov, D. V., Muratova, N. S., Kokh-Tatarenko, V. S., Nebyvayev, A. V.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-11-2022; Springer; Springer Nature B.V
• Subjects: Analysis; Biomass; Calorific value; Carbon content; Chemistry; Chemistry and Materials Science; Coffee; Comparative studies; Distilleries; Drying; Flue gas; Fluidized beds; Geotechnical Engineering & Applied Earth Sciences; Industrial Chemistry/Chemical Engineering; Industrial Ecology; Industrial Pollution Prevention; Methods; Mineral Resources; Pyrolysis; Raw materials; Sewage sludge; Stillage; coffee grounds; distillery stillage; biomass; biochar; brewer’s grains; torrefaction; sewage sludge; fluidized bed
• ISSN: 0009-2355; 1573-8329
• DOI: 10.1007/s10556-023-01132-5

The article describes the investigation of the torrefaction process of four samples of biomass (brewer’s grains, sewage sludge, distillery stillage, and coffee grounds) in a fluidized bed in an environment of superheated steam at a temperature of 300°C and in a flue gas environment (oxidative torrefaction) at a temperature of 250°C. It has been established that the torrefaction of brewer’s grains, distillery stillage and coffee grounds produces biochar with a higher carbon content and a higher calorific value than that of the raw biomass. In addition, it has been found that the best raw material for producing biochar among the studied biomass samples is coffee grounds; brewer’s grains is somewhat inferior to it. It is not advisable to use sewage sludge and distillery stillage as raw materials for biochar production.