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최항석(H.S. Choi),김관태(K.T. Kim),김석준(S.J. Kim),정상현(S.H. Jeong),송영훈(Y.H. Song),홍성호(S.H. Hong),이준엽(J.Y. Lee) 한국연소학회 2006 KOSCOSYMPOSIUM논문집 Vol.- No.-
In this study, to increase the mixing between flue gas and reducing agent, new shapes of NH₃ ejection nozzles are designed and experimentally and numerically tested. The nozzles have six holes perpendicular to the ambient flue gas flow and the tilting angle between direction of ambient flow and the hole axis is varied. To evaluate the mixing efficiency of the proposed nozzles, numerical and experimental tests are applied to several flow conditions comparing with single hole nozzle, which is commonly used in conventional SCR process. From the results the nozzle with tilted multi-holes has the large region of high turbulent intensity compared with conventional single hole nozzle. This is originated from the high vorticity near the upstream of the jet flow issuing from the hole. The high turbulent intensity and vorticity magnitude lead to enhanced mixing between flue gas and reducing agent. Hence, the most suitable moral ratio between NOx and reducing agent for the catalytic reaction can be obtained on behalf of the intensified scalar mixing within shorter physical mixing length.