<abstract xmlns="http://www.w3.org/1999/xhtml"><p> The development of the swirling flame flow field and gasification/ combustion dynamics at thermo-chemical conversion of biomass pellets has experimentally been studied using a pilot device, which combines a biomass gasifier and combustor by varying the inlet conditions of the fuel-air mixture into the combustor. Experimental modelling of the formation of the cold nonreacting swirling airflow field above the inlet nozzle of the combustor and the upstream flow formation below the inlet nozzle has been carried out to assess the influence of the inlet nozzle diameter, as well primary and secondary air supply rates on the upstream flow formation and air swirl intensity, which is highly responsible for the formation of fuel-air mixture entering the combustor and the development of combustion dynamics downstream of the combustor. The research results demonstrate that at equal primary axial and secondary swirling air supply into the device a decrease in the inlet nozzle diameter enhances the upstream air swirl formation by increasing swirl intensity below the inlet nozzle of the combustor. This leads to the enhanced mixing of the combustible volatiles with the air swirl below the inlet nozzle of the combustor providing a more complete combustion of volatiles and an increase in the heat output of the device.</p></abstract>

The development of the swirling flame flow field and gasification/ combustion dynamics at thermo-chemical conversion of biomass pellets has experimentally been studied using a pilot device, which combines a biomass gasifier and combustor by varying the inlet conditions of the fuel-air mixture into the combustor. Experimental modelling of the formation of the cold nonreacting swirling airflow field above the inlet nozzle of the combustor and the upstream flow formation below the inlet nozzle has been carried out to assess the influence of the inlet nozzle diameter, as well primary and secondary air supply rates on the upstream flow formation and air swirl intensity, which is highly responsible for the formation of fuel-air mixture entering the combustor and the development of combustion dynamics downstream of the combustor. The research results demonstrate that at equal primary axial and secondary swirling air supply into the device a decrease in the inlet nozzle diameter enhances the upstream air swirl formation by increasing swirl intensity below the inlet nozzle of the combustor. This leads to the enhanced mixing of the combustible volatiles with the air swirl below the inlet nozzle of the combustor providing a more complete combustion of volatiles and an increase in the heat output of the device.

Control of the Development of Swirling Airflow Dynamics and Its Impact on Biomass Combustion Characteristics

Latvian Journal of Physics and Technical Sciences

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

The development of the swirling flame flow field and gasification/ combustion dynamics at thermo-chemical conversion of biomass pellets has experimentally been...

Control of the Development of Swirling Airflow Dynamics and Its Impact on Biomass Combustion Characteristics

Article Category: Physical and Technical Energy Problems

Published Online: Aug 01, 2017

Page range: 30 - 39

DOI: https://doi.org/10.1515/lpts-2017-0018

Keywords
combustion of volatiles, flame composition, heat output, mixing of reactants, swirling flow dynamics

© by M. Zaķe

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Control of the Development of Swirling Airflow Dynamics and Its Impact on Biomass Combustion Characteristics

Article Category: Physical and Technical Energy Problems

Published Online: Aug 01, 2017

Page range: 30 - 39

DOI: https://doi.org/10.1515/lpts-2017-0018

Keywordscombustion of volatiles, flame composition, heat output, mixing of reactants, swirling flow dynamics

© by M. Zaķe

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
combustion of volatiles, flame composition, heat output, mixing of reactants, swirling flow dynamics