An investigation on pollutant emissions from co-firing of RDF and coal.
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 degrees 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.
Chyang
Chien-Song
CS
Department of Chemical Engineering, Chung Yuan Christian University, Chungli, Taiwan, ROC. cschyang@gmail.com
Han
Yun-Long
YL
Wu
Li-Wei
LW
Wan
Hou-Peng
HP
Lee
Hom-Ti
HT
Chang
Ying-Hsi
YH
D000393:Air Pollutants / Q000032:analysis*; D001572:Benzofurans / Q000032:analysis; D002118:Calcium / Q000737:chemistry; D002122:Calcium Chloride / Q000737:chemistry; D002248:Carbon Monoxide / Q000032:analysis; D002713:Chlorine / Q000737:chemistry; D002947:Cities; D003031:Coal; D000072338:Dibenzofurans, Polychlorinated; D004736:Energy-Generating Resources; D009584:Nitrogen / Q000032:analysis / Q000737:chemistry; D010100:Oxygen / Q000032:analysis / Q000737:chemistry; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives / Q000032:analysis; D011210:Power Plants; D014866:Waste Products / Q000032:analysis*
D000393:Air Pollutants; D001572:Benzofurans; D003031:Coal; D000072338:Dibenzofurans, Polychlorinated; D000072317:Polychlorinated Dibenzodioxins; D014866:Waste Products; C041364:nitrox; D002713:Chlorine; D002248:Carbon Monoxide; D002122:Calcium Chloride; D009584:Nitrogen; D010100:Oxygen; D002118:Calcium