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김훈(Hoon Kim),이중용(Joong Yong Yi),이찬(Chan Lee),이재승(Jae Seung Lee) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.-
In this study, the De-NOx system of the CHP plant is a hybrid type in which SCR and SNCR are installed together, and the Urea is injected into the flue gas through a hot cyclone type vaporizer to convert it into NH₃ and supply it to the SCR. During operation, the Urea sprayed on the hot cyclone did not sufficiently vaporize, and isocyanate solids, which are intermediates of NH3 conversion, were generated and deposited, which resulted in the deterioration of the facility safety. In order to analyze the cause of this phenomenon, CFD modeling using ANSYS FLUENT was performed. As a result, Urea’s NH3 conversion was found to be the flue gas temperature, and the urea conversion rate was low at the flue gas temperature below 300℃. When the flue gas temperature was below 300℃, it was observed that the boiler was at the intial start-up time. As a improvement plan, Urea gasification facility was installed and flue gas heating system was installed in front of hot cyclone. As a result of review the direct fired heating system and the electric heating system with the flue gas heating system, it was considered that the electric heating system was appropriate. As a result of design of the electric heating device, it is considered that 790kW electric heating device is required in this case and the operation cost of 6.7 million won per year including the electric power cost would be required.