51.
Pollutant emissions from co-firing of refuse derived fuel (RDF) and coal were investigated in a vortexing fluidized bed combustor (VFBC). RDF-5 was made of common municipal solid waste (MSW). CaCO
3 was injected in the combustor to absorb HCl at 850 °C. The results show that NO
x and HCl emissions increase with RDF-5 co-firing ratio. The NO
x concentration in flue gas at the bottom of the combustor is higher than that at the top. However, the trend of HCl released is reverse compared with NO
x emissions. It was found that the HCl concentration decreases with increasing the molar ratio of Ca/Cl. However, the effect of CaCO
3 addition on HCl retention is not significant when the molar ratio of Ca/Cl is higher than 5. The chlorine content in fly ash increases obviously with the molar ratio of Ca/Cl. PCDD/Fs emissions decrease slightly with an addition of CaCO
3. In this study incomplete combustion is regarded as the main cause for polychlorinated dibenzo-
p-dioxins and dibenzofurans (PCDD/Fs) formation.
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