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Oxy-fuel combustion boiler for CO2 capturing: 50 kW-class model test and numerical simulation
안준,김혁주,최규성 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.10
A novel oxy-fuel burner was devised and integrated into a 50 kW-class furnace-type boiler system. A series of experiments was conducted to verify its feasibility for industrial applications. Additionally, numerical simulations were performed and the results validated against experimental data on the detailed physics inside the conventional-design combustion chamber. The oxy-fuel burner, with the help of gas radiation, could effectively heat the combustion chamber. The composition of the exhaust gas revealed that the sealing of the system is crucial to the achievement of high CO2 concentrations and low NOx emissions.
Combustion and heat transfer characteristics inside the combustion chamber of a wood pellet boiler
안준,김종진 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.2
A grate-firing boiler was developed for wood pellet fuel, and then its combustion characteristics were tested. The flame was stretchedto the exit of the combustion chamber, implying insufficient space for complete combustion. As a first step to resolve this problem, anumerical simulation was conducted for the combustion chamber. Turbulent and chemically reacting flow was considered by implementinga homogeneous reaction model. Flow field from the simulation showed strong recirculation flow at the upstream corner of the chamber,along which the flame was stretched to the exit. Based on these results, we suggest possible modification of the combustion chamberto improve combustion characteristics, such as relocating its exit or installing internals like guide vanes.
안준,문준철,김주희,김금솔,장철성 한국응용생명화학회 2019 Applied Biological Chemistry (Appl Biol Chem) Vol.62 No.-
Berry fruits have attracted attention because of their purported benefits for aging, cardiovascular disease, and cancer. Therefore, highly priced berry fruits might be targets for food adulteration and fraud. In this study, eight speciesspecific primer sets based on the single nucleotide polymorphism of the chloroplast genomes of four berry fruits (aronia, blackberry, cranberry, and strawberry) were developed for quantitative real-time PCR (qPCR) analysis by SYBR Green staining with the aim of preventing berry fruit food fraud. The developed primer pairs exhibited high efficiencies ranging from 88 to 110% with strong correlation coefficients ( R2 > 0.99) for the amplification of each target species. However, no clear correlation coefficients were evident for non-target species. To evaluate the practicality of the developed primers, 18 commercial berry fruit products were verified by qPCR analysis. The developed primer pairs were amplified to a low Ct value (range 16.1–23.3) for the target species and proved capable of detecting target species in berry fruit commercial foods. Therefore, the developed qPCR-based species-specific markers could be suitable for the prevention of berry fruit food fraud and to verify marker reliability.
6 t/h급 모듈형 수관식 보일러 증발관 모듈의 유동 및 열전달 특성
안준 한국전산유체공학회 2018 한국전산유체공학회지 Vol.23 No.4
A series of numerical simulation has been performed on the evaporator module with the fin which constitutes 6 t/h-class water-tube type boiler. Modules were designed by considering the energy conservation for each column, rather than the existing design procedure for a tube bank. Navier-Stokes simulations were carried out to understand the two and three dimensional effects such as entrance conditions that were not considered in the design process. The simulation was carried out to evaluate the performance of the fin by using conjugate heat transfer including thermal conduction of the evaporator tube. In the module with fin, the heat transfer coefficient is higher than the empirical correlation, which is interpreted as a combined result from the assumption error of the surface temperature, the conjugate heat transfer effect, and the entrance temperature mis-prediction. In order to improve the accuracy of the module design based on the design equation, the surface temperature setting technique should be developed according to the change of the main flow temperature.