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125 ㎿<SUB>th</SUB> Oxy-PC Corner Firing Boiler 수치해석 연구
채태영(Taeyoung Chae),류태우(TaeU Yu),방병열(Byung Reol Bang),양원(Won Yang) 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.38
Characteristics of oxy-PC(Pulverized coal) combustion are one of the key parameters for design of a PC boiler. In this study, a conventional corner-firing boiler for a 125 ㎿th PC power plant was numerically simulated under the conditions of air-PC and oxy-PC combustion, using FLUENT 6.3. We used discrete phase model for simulating behavior of coal particles, and drying, pyrolysis, char combustion, char gasification and volatile performed for various design conditions of an oxy-PC corner-firing burner such as flue gas recirculation ratio, velocities, temperatures and oxygen concentrations of the primary/secondary oxidizer. Simulation results of oxy-PC combustion were also compared with convectional air-PC conditions, and optimum operation conditions under the view of combustion, NOX emission and radiative heat transfer were discussed.
Dual fluidized bed 가스화기 설계를 위한 열/물질 정산
양원(Won Yang),이정우(Jeong Woo Lee),이은도(Uendo Lee),방병열(Byung Reol Bang),최영태(Young Tai Choi) 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.39
Dual fluidized bed gasification has been known to be one of the best technology for producing hydrogen-rich and high quality syngas for electricity generation by gas enigne, making synthetic natural gas (SNG) and/or diesel oil through F-T process. In this type of gasification, only endothermic reaction (steam gasification) occurs in the gasifier, provided energy from hot sand heated in a combustion chamber, which is known to be allothermic reaction. In this study, heat and mass balance calculation is conducted for the dual fluidized bed gasification system of 3 MWth to the gasifier. Sand circulation rate and amount of additional fuel input to the combustion chamber are key parameters in this calculation, By this 0-D calculation, the two important parameters were obtained and the results were discussed for further detailed design.
2 ㎿<SUB>th</SUB> 멀티버너 중유 연소 시스템에서의 합성가스 혼소 및 재연소 특성 연구
양원(Won Yang),양동진(Dong Jin Yang),최신영(Sin Young Choi),나익환(Ik-hwan Na),최종균(Chong-Gun Choi),채태영(Tae-Young Chae),방병열(Byung Reol Bang),김종수(Jong Soo Kim) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.41
This study is aimed to investigate characteristics of syngas co-combustion and reburning in a heavy oil - firing combustion chamber. Syngas was produced by partial oxidation of methane, and was supplied to just above the burner level. Overfire air (OFA) was used to burnout the unburned species. Reburning and reburning + staged combustion cases with total thermal input of 2 ㎿th have been tested, and the NOx emission could be reduced by ~50% maximum. Comparing with the previous experiments performed in the environment of < 1000℃ in the combustion chamber by 0.9 ㎿th input, reduction of NOx in the reburning zone effects of temperature in the chamber was investigated clearly, which implied that the high temperature in the furnace is essential for increasing the NOx reduction.