Publication Date:
2008
abstract:
The paper presents novel experimental results for the combustion of liquid bio-fuels in an internal circulating
fluidized bed (ICFB). A 20 kW experimental facility equipped with an air-assisted injector has
been used. Reliable operation, high combustion efficiency and limited temperature increase along the
combustion riser tube have been attained at different operating conditions. However, CO emission has
been rather higher than expected. A form of micro-explosive behaviour of the fuel has been experienced
at relatively low bed temperatures (710-730 oC), but this behaviour was significantly less intense than in
bubbling fluidized beds. A mathematical model of the combustion of liquid fuels has been adapted to ICFB
conditions. The comparison between model and experimental results demonstrates that the efficiency
of fuel-air mixing has a crucial role on combustion behaviour. Poor contact between air and fuel in the
bottom half of the riser is responsible for high CO levels measured during the experiments.
On the whole, the research demonstrates that the proposed liquid injection process could be suitable
for application in co-gasification or for incineration of liquid wastes.
© 2008 Elsevier B.V. All rights reserved
fluidized bed (ICFB). A 20 kW experimental facility equipped with an air-assisted injector has
been used. Reliable operation, high combustion efficiency and limited temperature increase along the
combustion riser tube have been attained at different operating conditions. However, CO emission has
been rather higher than expected. A form of micro-explosive behaviour of the fuel has been experienced
at relatively low bed temperatures (710-730 oC), but this behaviour was significantly less intense than in
bubbling fluidized beds. A mathematical model of the combustion of liquid fuels has been adapted to ICFB
conditions. The comparison between model and experimental results demonstrates that the efficiency
of fuel-air mixing has a crucial role on combustion behaviour. Poor contact between air and fuel in the
bottom half of the riser is responsible for high CO levels measured during the experiments.
On the whole, the research demonstrates that the proposed liquid injection process could be suitable
for application in co-gasification or for incineration of liquid wastes.
© 2008 Elsevier B.V. All rights reserved
Iris type:
01.01 Articolo in rivista
List of contributors:
Miccio, Francesco
Published in: