Catalytic co-combustion of biomass and brown coal in a fluidized bed: Economic and environmental benefits

• Published in: Journal of environmental sciences (China) 2024-06, Vol.140, p.24-36
• Main Authors: Dubinin, Yury V., Yazykov, Nikolay A., Yeletsky, Petr M., Tabakaev, Roman B., Belyanovskaya, Aleksandra I., Yakovlev, Vadim A.
• Format: Article
• Language: English
• Subjects: Biomass; Co-combustion; Coal; Economic effect; Environmental impact; Fluidized catalyst bed
• ISSN: 1001-0742; 1878-7320
• DOI: 10.1016/j.jes.2023.02.045

•Coal, sawdust and their mixtures were combusted in the fluidized bed of catalyst.•Addition of biomass increase the burnout degree up to 99.9% at 750 °С.•Addition of biomass decrease the environmental impact of combustion.•Combustion at 750 °C with the highest amount of sawdust is the most profitable.•Presence of CaO and MgO prevents SOx emission and slagging of heat exchange surfaces. The work is devoted to the study of combustion of brown coal, pine sawdust, and their mixtures in a fluidized bed of catalyst at 600–750°С. It is shown that an increase in the content of sawdust in a mixture with brown coal leads to an increase in the burnout degree of solid fuel from 94.4% to 99.9%, while the emission of greenhouse gases in the form of CO2 CO and NOx is reduced (CO2 from the biomass is not included in the balance). The high content of alkaline earth metal oxides (CaO and MgO) in the mineral part of brown coal, sawdust, and their mixtures eliminates the emission of sulfur oxides and the slagging of heat-exchange surfaces during the combustion in a fluidized bed of catalyst. The optimal temperature, when the highest burnout degree of the above fuels is achieved in the combustion is 750°С. It is also shown that the increase in temperature and the content of sawdust in the composition of the fuel mixtures has a positive effect on the economic and environmental process indicators. [Display omitted]