An investigation on pollutant emissions from co-firing of RDF and coal |
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| Authors: | Chien-Song Chyang Yun-Long Han Li-Wei Wu Hou-Peng Wan Hom-Ti Lee Ying-Hsi Chang |
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| Institution: | 1. Department of Chemical Engineering, Chung Yuan Christian University, Chungli 32023, Taiwan, ROC;2. School of Civil Engineering and Architecture, Anhui University of Technology, Ma’anshan 243002, PR China;3. Energy & Environment Laboratory, Industrial Technology Research Institute (ITRI), Hsinchu 31040, Taiwan, ROC;1. Department of Mechanical Engineering, The St. Thomas University Tunja, St. 19 #11-64, Tunja, Boyacá, Colombia;2. NEST – Excellence Group in Thermal Power and Distributed Generation, Institute of Mechanical Engineering, Federal University of Itajubá, Av. BPS 1303, Itajubá, Minas Gerais State CEP: 37500-903, Brazil;3. Seamans Center for the Engineering Arts and Sciences, University of Iowa, 3131 Iowa City, IA 52242, United States;1. School of Metallurgy and Resource, Anhui University of Technology, Maanshan 243002, Anhui Province, PR China;2. Department of Chemical Engineering, Chung Yuan Christian University, 200, Chung Pei Road, Chungli 32023, Taiwan, ROC;3. R&D Center for Environmental Technology, Chung Yuan Christian University, 200, Chung Pei Road, Chungli 32023, Taiwan, ROC |
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| Abstract: | 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). CaCO3 was injected in the combustor to absorb HCl at 850 °C. The results show that NOx and HCl emissions increase with RDF-5 co-firing ratio. The NOx 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 NOx emissions. It was found that the HCl concentration decreases with increasing the molar ratio of Ca/Cl. However, the effect of CaCO3 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 CaCO3. 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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