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박성제(SeongJe Park),홍용주(YongJu Hong),김효봉(HyoBong Kim),김양훈(YangHun Kim),나종문(JongMoon Na) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
A Stirling cryocooler is relatively compact, reliable, commercially available, and uses helium as a working fluid. Over the past decade and a half there has been rapid development of Stirling cryocoolers, mainly for military and space applications. Stirling cryocoolers have been widely used for the cooling of infrared sensors and high temperature superconducting filters to the temperature of the liquid nitrogen. The Stirling cryocooler with the rotary compressor is applicable to the cooling device for the compact mobile thermal imaging system, because the refrigerators have the compact structure and light weight. This paper presents design and operating process of the integral Stirling cryocooler and results obtained with the performance test for integral Stirling cryocooler. An experimental study will be carried out to develop the more efficient and reliable integral Stirling cryocooler.
역청탄과 아역청탄 혼합연소조건에서 혼소율이 순산소 연소특성에 미치는 영향
성연모(Yonmo Sung),문철언(Cheoreon Moon),안성율(Seongyool Ahn),안재우(Jaewoo An),나종문(Jongmoon Na),최경민(Gyungmin Choi),김덕줄(Duckjool Kim) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.41
This study focuses on the combustion characteristics of blended coals with bituminous and sub-bituminous coals under air and oxy-fuel combustion conditions. The effects of oxygen concentration and blending ratio on the combustion characteristics were experimentally investigated using a thermogravimetric analyser(TGA). Characteristic temperatures including ignition, burnout temperature and activation energy were determined from TG and DTG combustion profiles. As oxygen concentration increased and the presence of sub-bituminous coal, characteristic temperatures and activation energy decreased. The ignitability, reactivity and kinetics have all been greatly improved under oxy-fuel combustion conditions. Based on this, co-firing with bituminous and sub-bituminous coals under oxy-fuel combustion conditions may be suggested as an alternative method to the fuel flexibility and cost-effective power production with carbon capture and sequestration.