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SCR형 탈질 시스템의 암모니아 분사 노즐의 유량 제어에 대한 CFD기법 적용에 관한 연구
서덕철,김민규,정희택 한국전산유체공학회 2022 한국전산유체공학회지 Vol.27 No.4
In the present study, computational analysis tools have been applied to improving the performance of the denitrification process by flow control of the ammonia injection nozzles adjusting to the flow distribution of the nitrogen oxides in the inlet flue gas of the selective catalytic reduction system. The uniformity of NH3/NO molar ratio is selected as the performance parameter. Design Xplorer was used to minimize the root mean square of NH3/NO. Four types of inlet flow pattern were chosen as the simulated parameters, i. e. uniform, parabolic, upper-skewed and random. The flow rate of the sixteen nozzles installed in the ammonia injection grid was adjusted to the inlet conditions. In order to solve the three-dimensional steady, incompressible and viscous flow fields, the commercial software named as ANSYS-Fluent were used with the turbulence model. From the present computational analysis, the denitrification performance was improved between 1.47% and 88.6% according to flow pattern of the inlet flue gas.
탈질설비 내에서 입구유동 NOx 분포에 따른AIG유동제어의 전산해석적 연구
서덕철,김민규,정희택 한국청정기술학회 2019 청정기술 Vol.25 No.4
The selective catalytic reduction system is a highly effective technique for the denitrification of the flue gases emittedfrom the industrial facilities. The distribution of mixing ratio between ammonia and nitrogen oxide at the inlet of the catalystlayers is important to the efficiency of the de-NOx process. In this study, computational analysis tools have been applied toimprove the uniformity of NH3/NO molar ratio by controlling the flow rate of the ammonia injection nozzles according to thedistribution pattern of the nitrogen oxide in the inlet flue gas. The root mean square of NH3/NO molar ratio was chosen as theoptimization parameter while the design of experiment was used as the base of the optimization algorithm. As the inletconditions, four (4) types of flow pattern were simulated; i.e. uniform, parabolic, upper-skewed, and random. The flow rate of theeight nozzles installed in the ammonia injection grid was adjusted to the inlet conditions. In order to solve the two-dimensional,steady, incompressible, and viscous flow fields, the commercial software ANSYS-FLUENT was used with the k-ε turbulencemodel. The results show 선택적 촉매환원법은 산업 설비에서 분사되는 배기가스의 탈질 과정에 유용한 방법이다. 촉매 층 입구에서의 암모니아-질소산화물의 혼합비 분포는 탈질 과정에서 중요하다. 본 연구에서는 전산해석 기법을 이용하여 탈질설비의 입구 배기가스내 질소산화물의 유동 분포에 따른 암모니아 분사 노즐의 유량을 조절하여 NH3/NO 몰 비의 균일도를 개선하였다. 출구 X/H= 3 지점에서의 몰 비에 의한 평균제곱근오차 값을 최적화 변수로 선정하였고 실험계획법을 기반 한 최적화 알고리즘을 도입하였다. 균일, 포물선, 상향 솔림, 임의 등 4가지 입구 유동 형태에 대해 8개의 분사 노즐의 암모니아 분사 유량을 도출하였다. 정상상태의 비압축성 점성 이차원 유동장 해석을 위해 상용 소프트웨어인 ANSYS-FLUENT에 k-ε 난류모델을 적용하였다. 본 해석의 결과, 입구 배기가스의 유동 형태 별로 9.58%에서 80.0% 의 몰 비 개선 효과를 나타내었다.
가상발전소 플랫폼 최적운영을 위한 실시간 통신 원격단말장치 연구
이용재,서덕철,박종성,장해남 한국태양에너지학회 2022 한국태양에너지학회 논문집 Vol.42 No.4
We developed a remote terminal unit (RTU) with real-time communication for the optimal operation of a virtual power plant (Vpp) platform. Currently, Vpp presents two issues during operation: 1) inadequate implementation of real-time communication of measured data and 2) insufficient data security, high initial investment cost, maintenance cost, and insufficient ease of installation. To overcome these problems, we developed an integrated RTU module. The main objective was to develop a real-time power generation information transmission module that combines the functions of a power meter, an RTU, and environmental sensors, such that real-time information can be transmitted from the PV inverter, environment sensors, and power meters. Furthermore, the RTU can employ the standard protocol for exclusive PV system communication and save data during communication failure for as long as 90 d. It can also immediately transmit the saved data after recovering from a communication failure. Moreover, we developed an RTU webpage where users can change the configuration of the RTU module and monitor the condition of the inverter connection and power generation.