Fig. 5B and C show the CO and NOx concentrations profiles within the combustor at various secondary gas flow rates, respectively. In Fig. 5B, at the location of 2.03 m above the distributor, the CO concentration values increase with secondary gas flow rate. At the highest secondary gas flow rate (2.56 Nm3/min), the CO concentration reaches the peak value. This can be attributed to the fact that more un-burned particles are carried back to the splashing zone. The stoichiometric oxygen ratio in the bed is 90%; therefore, as more particles carried back to the bed and splashing zones, the CO concentration goes higher. In Fig. 5C, at the location of 2.03 m
above the distributor, NOx concentrations increase with the secondary gas flow rate which is due to the fact the higher secondary
Fig. 5B and C show the CO and NOx concentrations profiles within the combustor at various secondary gas flow rates, respectively. In Fig. 5B, at the location of 2.03 m above the distributor, the CO concentration values increase with secondary gas flow rate. At the highest secondary gas flow rate (2.56 Nm3/min), the CO concentration reaches the peak value. This can be attributed to the fact that more un-burned particles are carried back to the splashing zone. The stoichiometric oxygen ratio in the bed is 90%; therefore, as more particles carried back to the bed and splashing zones, the CO concentration goes higher. In Fig. 5C, at the location of 2.03 mabove the distributor, NOx concentrations increase with the secondary gas flow rate which is due to the fact the higher secondary
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