| dc.description.abstract | The flue gas emitted from an oil-fired power plant was sampled to analyze the concentrations and characteristics of FPM, FPM2.5, CPM and PAHs. Two boilers (A and B) with the same air pollution control device (APCD) were studied, and the flue gas characteristics of boiler B under different loads were discussed. The results show that the FPM concentrations emitted from the stacks of boilers A and B are 0.14 and 0.17 mg/Nm3, respectively, and the FPM2.5 concentrations are 0.11 and 0.09 mg/Nm3, respectively, while the CPM concentrations of the two boilers are 24.0 and 60.2 mg/Nm3, respectively. As the load of boiler B is increased from 30% to 80%, both FPM and FPM2.5 concentrations reveal upward trends, and the concentrations measured are 1.10 and 0.60 mg/Nm3, respectively, which are 6.5 times that of the 30% load. On the other hand, the CPM concentration is 65.0 mg/Nm3, which does not vary significantly compared with the original load condition, indicating that the effect of load on FPM emission is more significant than that of CPM. In the PAHs part, the total PAHs emitted from boiler A and boiler B are 3.10 and 2.30 μg/Nm3 respectively, while the PAHs concentration of boiler B at 80% load is 2.44 μg/Nm3, and the PAHs are mainly distributed in gas-phase. In terms of toxicity, the toxic equivalent concentrations of boiler A (A), boiler B 30% load (B1) and boiler B 80% load (B2) are 48.4, 5.0 and 13.5 ng-BaPeq/Nm3, respectively, with BcFE and BaP being the main contributing congeners. In addition, the emission factors calculated on the basis of fuel consumption indicate that the FPM, FPM2.5, CPM and PAHs emitted from boiler A of the oil-fired power plant are 1.7, 1.3, 288 and 0.04 mg/L; and the B1 and B2 are 2.3, 1.2, 818, 0.03 mg/L and 14.1, 7.7, 834, 0.03 mg/L, respectively. It shows that the emission factor of CPM is much higher than that of FPM, and the load is the main factor affecting the emission factor of FPM. The results show that boiler load and flue gas temperature have a certain influence on PAHs and PM emissions, and efforts are needed for further reduction of pollutant emissions. In addition, this study also investigates the removal efficiencies of PAHs achieved with commercial SCR catalyst at different temperatures (325°C - 400°C) and the results show that the efficiencies are within the range of 96–99%. | en_US |