In O-2/N-2 and O-2/CO2 atmospheres coal pyrolysis was complete and additional char conversion occurred. The degree of char conversion increased with oxygen concentration values but was further enhanced by the presence of carbon dioxide, suggesting a positive contribution of CO2 to the overall rate of conversion. Chemico-physical and structural analysis of chars revealed internal burning under regime II conditions and highlighted that the presence of CO2 favors the formation of lactones in the chars.
A drop tube reactor with high heating rates typical of pulverized boilers (> 10(4) K/s) has been used to carry out experiments with coal in different atmospheres: N-2, CO2, O-2/N-2 and O-2/CO2. The reactor wall temperature was set at 1573 K and the particles' residence time was kept below 130 ms.
Assessment of combustion rates of coal chars for oxy-combustion applications
Senneca O;Cerciello F;
2019
Abstract
A drop tube reactor with high heating rates typical of pulverized boilers (> 10(4) K/s) has been used to carry out experiments with coal in different atmospheres: N-2, CO2, O-2/N-2 and O-2/CO2. The reactor wall temperature was set at 1573 K and the particles' residence time was kept below 130 ms.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
