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고영건(Young Gun Go),류창국(Changkook Ryu),최상민(Sangmin Choi) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
Bed combustion of the waste in a grate type incinerator is closely inter-related with the gas flow region<br/> above through the release of combustion gas and radiative heat transfer. Numerical simulation applied to the<br/> incinerator typically simplified the waste combustion by assuming the gas properties leaving the bed. A<br/> combined simulation method of the gas flow and the bed combustion is proposed to extend the capability of<br/> the numerical simulation, in which the bed model provides the gas properties at the top of the bed to the gas<br/> flow model, and receives the radiative heat flux from the gas flow region onto the bed. Using an unsteady 1-<br/> dimensional bed model, test simulations are carried out according to furnace shape and operational parameters<br/> of the bed. The flow pattern in the gas flow region is basically dependent on the gas properties the bed, but is<br/> altered by the furnace shape. It determines the distribution of radiative heat influx on the bed the portion of<br/> gaseous emission. Changes in radiation transferred from the gas flow region in-turn affects the combustion<br/> characteristics of the bed, especially in the earlier stage of combustion. The combined simulation method<br/> enables to investigate the effect of various design and operational parameters on the combustion and gas flow<br/> in incinerators.
유류 버너에서 비대칭 연소용 공기 공급에 의한 연소실내 온도분포 변화에 관한 실험적 연구
고영건(Young Gun Go),최상민(Sangmin Choi),박주원(Ju-Won Park),양원(Won Yang) 한국연소학회 2008 KOSCOSYMPOSIUM논문집 Vol.- No.-
In most of conventional researches on round type burner and furnace, it is often assumed that the mean flow in furnace is axi-symmetric. But, in real situations, this assumption is not correct because there are some researches reported on axi-asymmetric combustion air supply in power plant boiler. In this study, effects of this axy-asymmetric combustion condition were studied by supplying non-uniformly distributed combustion air in oil-fired and 3-staged swirl burner. Axy-asymmetric combustion air conditions were created by supplying air in two different types of mode as uni-mode and bi-mode distributions through six different air inlets from the back panel of the burner and varying the deviation of air distribution. Temperature distribution profiles were measured in horizontal and radial direction in furnace to investigate the effects of axi-asymmetric condition. The experimental results show that uni-mode air distribution makes temperature distribution more non-uniform in furnace than bi-mode distribution and there are some critical deviation point in air distribution that makes the degree of non-uniform distribution of temperature increase suddenly.
연소용 공기 공급 불균일을 고려한 발전 보일러내 연소환경 시뮬레이션
고영건(Young Gun Go),최상민(Sangmin Choi),김영주(Young-zoo Kim) 한국연소학회 2006 KOSCOSYMPOSIUM논문집 Vol.- No.-
Oil-fired power plants usually use several burners and the combustion air is supplied to each burner through the complicated duct which is called windbox. A windbox should be designed to supply combustion air to each burner evenly but, due to the complicated duct shape, flow distribution in the windbox is unbalanced and uneven supplies of combustion air to each burner are induced by these unbalanced flow distribution in the windbox. These flow patterns tend to make flame unstable, increase the formation of pollutants and lower the overall combustion efficiency. To prevent these disadvantages, flow patterns in the windbox should be investigated for the uniform flow distribution. In this study, computational simulation method was used to investigate the flow distribution in the windbox and measured the velocities at the exit of burners in the real windbox to compare with CFD results. The results show two significant flow patterns. One is that the flow rates of each burner are different from each other and this means that all burners operate in different conditions of air to fuel ratio. The other is that the flow distribution at the exit of each burner is not axi-symmetric although the burner shape is axi-symmetric and this increases the pollutant products like CO.
비축대칭 연소용 공기 공급에 따른 유류버너 연소로내 온도분포 변화에 관한 실험적 연구
고영건(Young Gun Go),최상민(Sangmin Choi),박주원(Ju-Won Park),양원(Won Yang) 한국연소학회 2008 KOSCOSYMPOSIUM논문집 Vol.- No.-
Almost researches about the combustion characteristics of round-type oil-fired burner have assumed the axi-symmetric combustion condition. But this assumption may not be reasonable in actual combustion conditions because some researches have reported on the un-evenly distributed combustion air. In this study, the effects of the axy-asymmetric conditions induced by un-evenly supplied combustion air were studied by experimental method. The flame images captured by CCD camera and the temperatures measured in a furnace by thermocouples were used to analysis the flame shape distortions and axy-asymmetric combustion phenomena. The experimental results show that the axi-asymmetric conditions make the flame shape directed towards the air-lack regions and the temperature deviations become larger in axy -asymmetric conditions as long as combustion phenomena take place. In the lower regions of the furnace where combustion is almost finished, the effects of the axi-asymmetric conditions are diminished.
유류 연소 발전용 보일러에서 공기 공급 계통의 불균일성에 관한 실험적 연구
고영건(Young Gun Go),최상민(Sangmin Choi),김영주(Young-zoo Kim) 한국연소학회 2006 한국연소학회지 Vol.11 No.1
Oil-fired power plant usually uses several burners and combustion air is supplied to each burner through the complicated duct which is called windbox. A windbox should be designed to supply combustion air to each burner uniformly but, due to the complicated duct shape, flow distribution in the windbox is unbalanced and non-uniform supplies of combustion air are induced by these unbalanced flows in the windbox. These flow patterns tend to make flame unstable, increase the formation of pollutants and lower the overall combustion efficiency. To prevent these disadvantages, flow patterns in the windbox should be investigated for the uniform flow distribution. In this study, computational simulation method was used to investigate the flow distribution in a windbox and measured the velocities at the exit of burners in a real windbox and model tests to compare with CFD results. The results show two significant flow patterns. One is that the flow rates of each burner are different from each other and this means that all burners operate in different conditions of air to fuel ratio. The other is that the flow distribution at the exit of each burner is not axi-symmetric although the burner shape is axi-symmetric. Additionally some modifications of windbox shape and installation of baffles were proposed to make the uniform flow in the windox.
발전 보일러내 연소용공기 공급 불균일의 실험적 측정과 전산해석
고영건(Young Gun Go),최상민(Sangmin Choi),김영주(Young-Joo Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Power plant uses the multi-burner to heat up the boiler and complicated duct called windbox is used to supply combustion air to each burner. Non-uniformly supplied combustion air is induced by unbalanced flow distribution in the windbox. These flow patterns tend to make flame unstable, increase the formation of pollutants and lower the overall combustion efficiency. To prevent these disadvantages, flow patterns in the windbox should be investigated and made to be distributed uniformly. In this study, scaled model of the windbox was used to measure the velocities at the exit of the burner and the results were compared with the CFD results.