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폐기물소각설비 중 MSTG설비의 발전 및 응축효율에 관한 연구
전금하(Jeon, Kuemha),전광식(Jeon, Kwangsik),하충래(Ha, Choongrai) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
일일 50톤 처리용량의 도시고형폐기물소각설비의 폐열 보일러에서 생산되는 4.0~6.5 bar의 저압증기를 이용하여 전력을 생산하는 축류식 MSTG설비에 있어서 공급증기압력, 입출구의 압력차이에 의한 발전효율을 비교하고, 저압의 증기의 균질화를 위한 기술분리, 정압유지설비 및 증기터빈의 본체의 기수분리된 증기의 응축효율을 증기공급율, 발전효율별로 비교분석하였다. 공급되는 증기의 압력, 증기터빈의 입출구 압력 차이가 높아짐에 따라, 증기의 응축효율이 증가를 하였으며, 배출되는 증기량에 따른 발전효율의 증가는 없었다. 따라서, 가변적으로 변하는 저압의 증기를 기수분리 및 정압을 유지하여도 증기질의 변동이 없으며 그에 따른 증기의 엔탈피 변화가 없으므로 발전 효율의 향상을 기대하기는 어려웠다.
프리 플로우트 스팀트랩 밸브의 오리피스 지름 변화에 따른 작동 원리 및 응축수 배출량에 관한 연구
최인규(In-Kyou Choi),강정호(Jung-Ho Kang) 한국기계가공학회 2016 한국기계가공학회지 Vol.15 No.2
In the steam system, a stream trap valve discharges a condensate and a non-condensable gas. It also prevents stream from being leaked. The free float stream trap valve is a mechanical type of stream trap. The valve is opened when a hallow ball is floated due to the density of the condensate through the condensate flows into the valve. On the other hand, when the flow of the condensate is completed, the valve is closed as the float subsides due to the weight of the structure and the stream is blocked. In addition, the bimetal lifts the hallow ball, which discharges the non-condensable gas. In this study, the performance of the properties of the free float stream trap valve, the method of support for three points, and the orifice design are researched. Moreover, the condensate discharge capacity of the free float stream trap valve is calculated from the experiment.
고 질량유속 증기제트 방출시 과냉각수조 내의 열혼합 해석
강형석(Hyung Seok Kang),송철화(Chul Hwa Song) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
A CFD benchmak calculation for a thermal mixing test was performed for 30 seconds to develop the methodology analysis for the thermal mixing between steam and subcooled water. In the CFD analysis, the grid model simulating the sparger and the IRWST pool were developed by the axisymmetry condition and then the steam condensation phenomena by a direct contact was modelled by the so-called condensation region model. The comparison of the CFD results with the test data showed a good agreement as a whole, but a small temperature difference was locally found at some locations. However, the commercial CFD code of CFX4.4 together with the condensation region model can simulate the thermal mixing behaviour reasonably well when a sufficient number of mesh distribution and a proper numerical method are adopted.
증기제트 방출시 과냉각수조 내의 열혼합 현상 CFD 해석
강형석(Hyung Seok Kang),송철화(Chul Hwa Song) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
A CFD analysis for a thermal mixing experiment during steam jet discharge was performed to develop the analysis methodology for the thermal mixing between steam and subcooled water and to find the optimized numerical method. In the CFD analysis, the steam condensation phenomena by a direct contact was modelled by the so-called condensation region model. The comparison of the CFD results with the test data showed a good agreement as a whole, but a small temperature difference was locally found at some locations. However, the commercial CFD code of CFX4.4 together with the condensation region model can simulate the thermal mixing behaviour reasonably well when a sufficient number of mesh distribution and a proper numerical method are adopted.
강형석(H.S. Kang),김연식(Y.S. Kim),전형길(H.G. Chun),송철화(C.H. Song) 한국전산유체공학회 2006 한국전산유체공학회지 Vol.11 No.2
A CFD benchmark calculation for a steam blowdown test was performed for 30 seconds to develop the methodology of numerical analysis for the thermal mixing between steam and subcooled water. In the CFD analysis, the grid model simulating the sparger and the IRWST pool were developed by the axisymmetric condition and then the steam condensation phenomena by a direct contact was modelled by the so-called condensation region model. Thermal mixing phenomenon in the subcooled water tank was treated as an incompressible flow, a free surface flow between the air and the water, a turbulent flow, and a buoyancy flow. The comparison of the CFD results with the test data showed a good agreement as a whole, but a small temperature difference was locally found at some locations. The commercial CFD code of CFX4.4 together with the condensation region model can simulate the thermal mixing behavior reasonably well when a sufficient number of mesh distribution and a proper numerical method are adopted.