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http://dx.doi.org/10.7464/ksct.2018.24.3.212

Pollutants Behavior in Oxy-CFBC by Application of In-Furnace deSOx/deNOx Method  

Choi, Gyung-Goo (Department of Environmental Machinery, Koera Institute of Machinery & Materials)
Na, Geon-Soo (Department of Environmental Machinery, Koera Institute of Machinery & Materials)
Shin, Ji-Hoon (Department of Environmental Machinery, Koera Institute of Machinery & Materials)
Keel, Sang-In (Department of Environmental Machinery, Koera Institute of Machinery & Materials)
Lee, Jung-Kyu (Department of Environmental Machinery, Koera Institute of Machinery & Materials)
Heo, Pil-Woo (Department of Environmental Machinery, Koera Institute of Machinery & Materials)
Yun, Jin-Han (Department of Environmental Machinery, Koera Institute of Machinery & Materials)
Publication Information
Clean Technology / v.24, no.3, 2018 , pp. 212-220 More about this Journal
Abstract
Oxy-fuel combustion is considered as a promising greenhouse gas reduction technology in power plant. In this study, the behaviors of NO and $SO_2$ were investigated under the condition that in-furnace $deNO_x$ and $deSO_x$ methods are applied in oxy-fuel circulating fluidized bed combustion condition. In addition, the generation trends of $SO_3$, $NH_3$ and $N_2O$ were observed. For the purpose, limestone and urea solution were directly injected into the circulating fluidized bed combustor. The in-furnace $deSO_x$ method using limestone could reduce the $SO_2$ concentration in exhaust gas from ~403 to ~41 ppm. At the same experimental condition, the $SO_3$ concentration in exhaust gas was also reduced from ~3.9 to ~1.4 ppm. This trend is mainly due to the reduction of $SO_2$. The $SO_2$ is the main source of the formation of $SO_3$. The negative effect of $CaCO_3$ in limestone, however, was also appeared that it promotes the NO generation. The NO concentration in exhaust gas reduced to ~26 - 34 ppm by appling selective non-catalytic reduction method using urea solution. The $NH_3$ concentration in exhaust gas was appeared up to ~1.8 ppm during injection of urea solution. At the same time, the $N_2O$ generation also increased with increase of urea solution injection. It seems that the HNCO generated from pyrolysis of urea converted into $N_2O$ in combustion atmosphere. From the results in this study, the generation of other pollutants should be checked as the in-furnace $deNO_x$ and $deSO_x$ methods are applied.
Keywords
Oxy-fuel combustion; In-furnace desulfurization; Selective non-catalytic reduction (SNCR); $N_2O$ generation; $NH_3$ slip; $SO_3$ generation;
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