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석탄화력 발전용 순환유동층 보일러 내 고온 증기부 운전의 동특성 이해와 응용
이후경(Hookyung Lee),김효준(Hyojun Kim),김영운(Youngoon Kim),이기현(Kihyun Lee) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
In a thermal plant for power generation, transient behavior caused by load changes is largely controlled by a firing rate of fuel and a feeding rate of water. Different time constants in the boiler system which is composed of the complex configuration of heating surfaces lead considerable response time. The CFB boiler is one of the alternatives for environmental regulations aimed at controlling air emissions at coal-fired power plants. According to the previous presentation results associated with air/gas side in the CFB furnace, this paper reports dynamic simulation and analysis results for thermal process design of water/steam side in the back-pass part of the CFB boiler. The deviation between simulated results and design values is acceptable in engineering application. Finally, the CFB boiler module will be connected on the computational domain of our own dynamic plant simulation tool. It may provide strong support for the furnace and back-pass design in ultra-supercritical CFB boiler system ultimately.
이후경(Hookyung Lee),최상민(Sangmin Choi) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.42
As a variety of coals are used in the industrial furnace, reactivity of each coal should be considered. It has influence on combustion characteristics, such as flame pattern, burnout, and NOx formation. In coal combustion modeling through general purpose CFD analysis, reactivity of coal is simply represented by kinetic parameters, such as pre-exponential factor and activation energy. Therefore, effects of various kinetic parameters should be interpreted. In this study, flame pattern is simply interpreted by adjusting the kinetic parameters in reasonable range through references. Comparison between measurements and modeling is presented in terms of the flow and flame pattern within the reference coal burner. Thereby, appearance of flame shape and temperature distribution are obtained according to adjustable kinetic parameters.