http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
암모니아 화염의 질소산화물 생성과정에서의 난류 및 화학 메커니즘 영향
구인영(Inyeong Gu),신동혁(Donghyuk Shin) 한국연소학회 2022 KOSCOSYMPOSIUM논문집 Vol.2022 No.11
Recently, carbon-free fuels such as hydrogen and ammonia have received strong attention as a method to effectively reduce carbon dioxide emissions. Ammonia, one of the carbon-free fuels, has some economic advantages over hydrogen, but using the pure ammonia gas turbine is limited because of its combustion characteristics, such as low reactivities and high Prompt NOx emissions. In this study, the characteristics of ammonia/air-premixed flame and the effects of turbulent flows were analyzed through Numerical Simulation.
최민준(Minjun Choi),구인영(Inyeong Gu),신동혁(Dong-Hyuk Shin) 한국연소학회 2021 KOSCOSYMPOSIUM논문집 Vol.2021 No.5
This study investigated effects of combustion models in predicting NOx emission with computational fluid dynamics (CFD) simulations. Hydrogen/air combustion is considered as a future technology as the process does not emit green-house gases. Still, hydrogen combustion is prone to produce nitrogen oxides (NOx) which needs further investigation. We tested the accuracy of the NOx post-processing method by comparing with the full GRI-3.0 mechanism in laminar Bunsen flames. The post-processing method slightly overpredicted NOx emission by 8.3 %. Secondly, we also conducted RANS simulations on a Norwegian University of Science and Technology (NTNU) burner with two combustion models; the Turbulent Flame-speed Closure (TFC) model and the Eddy Dissipation Concept (EDC) model. The TFC model resulted in the NOx prediction in the same order of magnitude with the experimental measurement, while the EDC model over-predicted the NOx emission by four times. The results highlighted that prediction of NOx emissions is strongly dependent on the choice of combustion model.
김형우(Hyoungwoo Kim),구인영(Inyeong Gu),신동혁(Dong-hyuk Shin) 한국연소학회 2021 KOSCOSYMPOSIUM논문집 Vol.2021 No.11
A web-based platform is developed for researchers to obtain flame characteristics using a web browser. The platform uses open-source chemical kinetics software and command –line client web application: Cantera, Ember, and Jobson. The platform calculates flame characteristics such as flame speed, flame temperature, emission, and more for premixed and diffusion flames. Various fuel/oxidier compositions and various chemical mechanisms are available, and more compositions and mechanisms are planned to be included.
김형우(Hyoungwoo Kim),진욱화(Ukhwa Jin),고영건(Younggun Go),최민준(Minjun Choi),구인영(Inyeong Gu),백민하(Minha Baek),김규태(Kyu Tae Kim),신동혁(Dong-hyuk Shin) 한국연소학회 2022 한국연소학회지 Vol.27 No.2
This report surveys recent developments of carbon-neutral gas turbine combustion technology. Since the Paris Climate Agreement in 2019, each country committed a nationally determined contribution (NDC) which identifies key targets to reduce the temperature rise. In order to meet the NDC, each government is pushing hard to reduce greenhouse gas emissions, and using carbon-neutral fuel is a straightforward way to reduce to achieve the goals. As carbon-neutral fuels such as hydrogen or ammonia have different thermodynamic and transport properties, it needs paradigm changes in many related sectors. Gas turbine is one of the sectors, and this report reviews ongoing progress and challenges centered around developing carbon-neutral gas turbine combustion technology.