http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
이용운(Yong-Woon Lee),예인수(In-Soo Ye),이명일(Ming-Ri Li),홍재현(Jae-Hyeon Hong),오정근(Jeong-Geun Oh),이웅진(Ung-Jin Lee),류창국(Chang-Kook Ryu) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.40
Wood pellet is a densified fuel with homogeneous physical properties suitable for use in various scales of domestic and industrial furnaces. A wood pellet stove is a small-scale furnace for domestic heat production, which can replace the conventional oil or gas boilers. Since the fuel properties of wood pellet is very different from oil or gas, the design of a wood pellet stove requires profound understanding on the solid fuel combustion as well as gas flow mixing/reactions. Due to the size limit of the furnace height (~1m) for domestic installation, poor design of furnace, air supply and heat exchanger may lead to excessive emission of CO or low energy efficiencies. This study evaluated the design of an existing wood pellet stove with 30,000 ㎉/hr capacity using experimental and computational techniques in order to optimize the furnace design. The results show that it is critical to minimize the unused furnace volume and to enhance the gaseous mixing for reduced CO emission.
채태영(Tae-Young Chae),박상현(Sang-hyun Park),홍재현(Jae-hyeon Hong),예인수(In-soo Ye),양원(Won Yang),류창국(Changkook Ryu) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.40
Due to limited experiences on oxy-coal combustion, designing the burners or boilers requires the use of computational fluid dynamics(CFD) for assessment of various design parameters. The simulations of coal combustion have to consider numerous phenomena for production of reliable results. However, the input parameters for coal combustion processes, gaseous reactions and radiative heat transfer are not easy to determine. This study assessed the key simulation methods for oxy-coal combustion: reaction model (mixture fraction model or species transport model) and particle size, while using the typical parameters for devolatilization and char combustion available in a commercial CFD code, FLUENT. Comparison with existing data in literature suggested that the use of mixture fraction model with distributed particle sizes is preferred over the species transport model and uniform particle size. Application of such simulation methods generated reasonable results for recent test data at KEPRI. Further investigation is required on the development of a model suitable for the gas absorption coefficient at oxy-coal combustion conditions.
전산유동해석을 이용한 100㎿<SUB>e</SUB> 규모 석탄 순산소 연소 실증플랜트의 설계 및 운전조건 평가
채태영(Tae-Young Chae),박상현(Sang-hyun Park),홍재현(Jae-hyeon Hong),양원(Won Yang),류창국(Changkook Ryu) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.41
As one of the main technologies for carbon capture and storage, oxy-coal combustion is being developed for demonstration in Korea. This study presents the results of numerical simulation for combustion in a wall fired 100㎿e boiler proposed for initial design of the demonstration plant. Using a commercial CFD code, the detailed combustion, flow and heat transfer characteristics were assessed both for air mode and oxy mode combustion. The results show that dual mode operation can be achieved in the current wall-fired boiler configuration with 12 burners of 30 ㎿th each, but the differences in the wall heat flux and temperature between the two combustion modes need to be considered in the design and operation. Further development for the boiler design is required.