화력발전소 탈질설비의 암모니아 혼합 관에서 희석 공기와 암모니아의 혼합에 관한 연구 = A Study on the Mixing of Dilution Air and Ammonia in the Ammonia Mixing Pipe of the Thermal Power Plant De-NOx Facility

다국어 초록 (Multilingual Abstract)

According to reinforce environmental regulations, coal power plants have used selective cata- lytic reduction using ammonia as a reducing agent to reduce the amount of nitrogen oxide generation. The pur- pose of the present study was to derive a mixing device for effectively mixing dilute air and ammonia in the am- monia mixing pipe by performing computational fluid dynamic analysis. The mixing effect was compared by analysing the %RMS of ammonia concentration at the down stream cross section in the mixing pipe and the 16 outlets based on the case 1-1 shape, which is an existing mixing pipe without a mixing device. The mixing de- vice was performed by changing the positions of a square plate on the downstream side of the ammonia supply pipe and an arc-shaped plate on the wall of the mixing pipe. In the case of the existing geometry(Case 1-1), the %RMS of ammonia concentration at the 16 outlets was 29.50%. The shape of the mixing device for Case 3-2 had a square plate on the downstream side of the ammonia supply pipe and an arc plate was installed adjacent to it. The %RMS of ammonia concentration for Case 3-2 was 2.08% at 16 outlets and it could be seen that the shape of Case 3-2 was the most effective mixing shape for ammonia mixing.

국문 초록 (Abstract)

강화되는환경규제에따라석탄화력발전소에서는암모니아를환원제로사용하는선택적촉매환원법을이용 하여질소산화물의발생량을감소시키고있다. 본연구에서는전산유동해석을수행하여암모니아혼합관에서희 석공기와암모니아를효과적으로혼합하기위한혼합장치를도출하는것을목적으로수행하였다. 혼합장치가없 는기존혼합관형상인Case 1-1 형상을기준으로혼합관내의후류단면과16개출구에서암모니아농도의%RMS 를비교하여혼합효과를비교하였다. 혼합장치는암모니아공급관후류에사각판과혼합관벽면에원호모양의 판의위치를변경하여수행하였다. 기존형상의경우(Case 1-1)에16개출구에서암모니아농도의%RMS는29.50% 로나타났다. 혼합장치형상이암모니아공급관후류에사각판이있는것과인접한곳에원호판을설치한Case 3-2 형상의16개출구에서암모니아농도의%RMS는2.08%로나타났으며암모니아혼합에가장효과적인혼합형 상임을알수있었다.

참고문헌 (Reference)

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4 KEPCO, "The Monthly Report on Major Electric Power Statistics" 517 : 40-, 2022

5 Go, Y. G., "Numerical Simulation for Flow Optimization of De-NOX Selective Catalytic Reactor" 99-105, 2001

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