Oxy-fuel combustion is an option for carbon capture and sequestration. This technology is still at the demonstration stage and there are several research needs that should to be satisfied to improve the reliability of this technology. One of the key issues to address is the behaviour of solid fuels switching from traditional air firing to oxy combustion. In this work a methodology to evaluate the properties of solid fuels is described. The experimental work is coupled with a CFD model of the DTR to predict the thermal histories of the coal particles, which can be used to evaluate kinetics according to a previously developed routine. Some preliminary results of firing tests at high heating rate of a Columbian coal with atmospheres at different CO2/O2 ratios are presented. The tests are carried out in a Drop Tube Reactor operating at a nominal temperature of 900 °C. Tests in air and nitrogen are performed for comparison. The results show that in these operating conditions carbon dioxide reduces the conversion of the coal particle, therefore a higher proportion of oxygen is required in Oxy-fuel conditions to match the conversion obtained from air firing. Copyright © 2009, AIDIC Servizi S.r.l.
Characterization of solid fuels in oxy-fuel conditions,
GALLETTI, CHIARA;TOGNOTTI, LEONARDO
2009-01-01
Abstract
Oxy-fuel combustion is an option for carbon capture and sequestration. This technology is still at the demonstration stage and there are several research needs that should to be satisfied to improve the reliability of this technology. One of the key issues to address is the behaviour of solid fuels switching from traditional air firing to oxy combustion. In this work a methodology to evaluate the properties of solid fuels is described. The experimental work is coupled with a CFD model of the DTR to predict the thermal histories of the coal particles, which can be used to evaluate kinetics according to a previously developed routine. Some preliminary results of firing tests at high heating rate of a Columbian coal with atmospheres at different CO2/O2 ratios are presented. The tests are carried out in a Drop Tube Reactor operating at a nominal temperature of 900 °C. Tests in air and nitrogen are performed for comparison. The results show that in these operating conditions carbon dioxide reduces the conversion of the coal particle, therefore a higher proportion of oxygen is required in Oxy-fuel conditions to match the conversion obtained from air firing. Copyright © 2009, AIDIC Servizi S.r.l.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
