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암모니아-수소/공기 대향류 비예혼합 화염 연소특성 연구
최선(S. Choi),권오채(O.C. Kwon) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
The potential of ammonia(NH<SUB>3</SUB>)-hydrogen(H<SUB>2</SUB>) blends to improve the safety of hydrogen use was evaluated experimentally, using non-premixed NH<SUB>3</SUB>-H<SUB>2</SUB>/air counterflow flames at normal temperature and pressure. The effects of NH<SUB>3</SUB> concentration on the extinction limits and temperature profiles of non-premixed NH<SUB>3</SUB>-H<SUB>2</SUB>/air flames were investigated. Results show reduction of the extinction limits, the maximum temperature and thickness of flame with ammonia enhanced NH3 concentration in NH<SUB>3</SUB>-H<SUB>2</SUB>/air flames.
초소형 리포밍 시스템을 이용한 암모니아로부터의 수소 생산
김정호(J.H. Kim),주재문(J.M. Joo),이상익(S.I. Lee),권오채(O.C. Kwon) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The potential of reforming ammonia as a carbon-free fuel in production of hydrogen was experimentally evaluated, using a micro reforming system integrated with a micro-combustor. The micro-combustor as a heat source is a simple cylinder with an annular-type shield that applies a heat-recirculation concept. A micro-reformer to convert ammonia to hydrogen is an annulus, which is effective to transfer heat from the micro-combustor. The annulus-type micro reforming system is designed to produce 1-10 W of hydrogen using ruthenium as a catalyst. The results show that the feed rate of ammonia and the micro-combustor inlet velocity of fuel-air mixtures substantially affect the performance of the micro reforming system. Under appropriate operating conditions, the maximum conversion rate of 98.0% was obtained, which implies that the present configuration can be applied to practical micro reforming systems, supporting the potential of using ammonia as a clean fuel.
김희경(H.K. Kim),김태영(T.Y. Kim),서응렬(E.R. Seo),권명근(M.K. Kwon),Qasim Sarwar Khan,권오채(O.C. Kwon) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Effects of the port configurations on the performance of gas cooktop burners are experimentally studied. For various types and port configurations of burners, turn-down ratios, efficiencies and NO<SUB>x</SUB> emissions are evaluated and flames are visualized using OH<SUP>*</SUP> chemiluminescence. Results show that efficiencies are generally enhanced with increasing port exit angle and decreasing interval.