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Solid waste mixtures combustion in a circulating fluidized bed : emission properties of NOx, dioxin, and heavy metals

Zhang, Hanfei and Lv, Caixia and Li, Jun and Qin, Wu and Hu, Yukun and Dong, Changqing (2015) Solid waste mixtures combustion in a circulating fluidized bed : emission properties of NOx, dioxin, and heavy metals. Energy Procedia, 75. pp. 987-992. ISSN 1876-6102

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Abstract To efficiently and environment friendly combust the domestic garbage, sludge, and swill waste fuels, five different fuels are prepared by mixing the waste fuels together with coal, and grass biomass at different mixing ratios, and finally those fuels were combusted in a circulating fluidized bed (CFB) reactor. The emission performances of NOx, dioxin, and heavy metal during the combustion tests are studied. The results showed that a stable furnace temperature can be reached at approximately 850 °C when combusting all studied mixed fuels, benefiting the thermal processes of sludge and domestic garbage and thus realizing the purpose of waste-to-fuel. In addition, the dioxin emissions are much lower than the emission standards, and NOx emissions could be reduced significantly by adjusting the ratio of waste fuels. However, the emissions of mercury, lead, and the combinations of chromium, tin, antimony, cupper and manganese components all exceeded the pollution control standard for hazardous wastes incineration, a further technology is required for heavy metal reductions to achieve the emission standards.