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연간 300만톤급 온실가스 감축을 위한 해양 CCS 플랜트 기술
허철,강성길,이금석,박영규,Huh, Cheol,Kang, Seong-Gil,Lee, Keum-Suk,Park, Young-Gyu 대한기계학회 2013 대한기계학회 논문집. Transactions of the KSME. C, 산업기술과 혁신 Vol.1 No.1
기후변화 완화를 위한 온실가스 감축 수단으로서 대량의 이산화탄소를 포집하여 저장하는 이산화탄소 포집 및 저장(CCS) 기술의 중요성이 날로 부각되고 있다. CCS 기술은 발전소등과 같은 대규모 배출원에서 배출되는 이산화탄소를 바로 감축 가능케 할 뿐 아니라 지속 가능한 성장을 통한 탄소 에너지 산업 구조를 활용 가능하게 한다. 본 논문에서는 '국가 CCS 종합추진계획'에 근거 해양을 매개로 연간 300만톤급 CCS 실증을 위한 $CO_2$ 수송 및 저장기술의 국내 개발현황을 고찰하고자 한다. Carbon dioxide Capture and Storage (CCS) is one of the key players in greenhouse gas (GHG) reduction portfolio for mitigating climate change. CCS makes it possible not only to reduce a huge amount of carbon dioxide directly from coal power plant but also to maintain the carbon concentrated-energy infrastructure. The objective of the present paper is to review and introduce R&D progress and large scale demonstration plan focused on marine geological storage in Republic of Korea.
2 상 마이크로채널 히트싱크에서의 유동 양식과 비등 열전달계수
허철(Cheol Huh),김무환(Moo Hwan Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
The present paper proposes a baseline for new flow boiling heat transfer coefficient correlation in a microchannel heat sink. An experimental measurement and evaluation of boiling heat transfer coefficients were carried out using a horizontal rectangular microchannel heat sink having a hydraulic diameter of 100 ㎛. Test results showed that the measured boiling heat transfer coefficients had week dependence on quality at bubble/elongated bubble flow and no dependence on mass flux at elongated slug/annular flow. A modified new flow boiling heat transfer coefficient correlation using the heat flux, surface tension and hydraulic diameter is proposed. The suggested correlation shows good predictions capability and provides a design guide line for the microchannel heat sinks.
이산화탄소 해양지중저장 처리를 위한 파이프라인 수송시스템의 열-유동 해석
허철(CHEOL HUH),강성길(SEONG-GIL KANG),홍섭(SUP HONG),최종수(JONG-SU CHOI),백종화(JONG-HWA BAEK) 한국해양공학회 2008 韓國海洋工學會誌 Vol.22 No.6
The concentration of atmospheric carbon dioxide (CO2), which is one of the major greenhouse gases, continues to rise with the increase in fossil fuel consumption. In order to mitigate global warming, the amount of CO2 discharge to the atmosphere must be reduced. Carbon dioxide capture and storage (CCS) technology is now regarded as one of the most promising options. To complete the carbon cycle in a CCS system, a huge amount of captured CO2 from major point sources such as power plantsshould be transported for storage into the marine or ground geological structures. Since 2005, we have developed technologies for marine geological storage of CO2, including possible storage site surveys and basic design of CO2 transport and storage process. In this paper, the design parameters which will be useful to construct on-shore and off-shore CO2 transport systems are deduced and analyzed. To carry out this parametric study, we suggested variations in thedesign parameters such as flow rate, diameter, temperature and pressure, based on a hypothetical scenario. We also studied the fluid flaw behavior and thermal characteristics in a pipeline transport system.
마이크로채널 내에서의 유동비등 열전달 특성에 대한 실험적 연구
허철(Cheol Huh),김무환(Moo Hwan Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
An experimental investigation was performed to study boiling heat transfer in a microchannel. Simultaneous visualization and measurement of flow boiling were carried out using a single horizontal rectangular microchannel having a hydraulic diameter of 103.5 ㎛. Tests were performed for a mass flux of 77.5, 154.9, and 309.8 ㎏/㎡s and a heat flux of 180-500 ㎾/㎡. Test results showed that nucleate boiling heat transfer and bubbly flow was dominant in the middle sections of the microchannel. However near the exit of microchannel, convective heat transfer and very long elongated slug flow acting like an annular flow was dominant.
마이크로채널에서의 유동비등 열전달과 2 상 유동 압력강하
허철(Cheol Huh),김무환(Moo Hwan Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
With a single horizontal rectangular microchannel and a series of microheaters made with Micro-Electro-Mechanical Systems (MEMS) technique, two-phase pressure drop and local flow boiling heat transfer of deionized water were investigated. The test microchannel had a hydraulic diameter of 100 ㎛ and a length of 40 ㎜. Tests were performed for mass fluxes of 90 to 267 ㎏/㎡s and heat fluxes of 100 to 700 ㎾/㎡. The experimental local flow boiling heat transfer coefficients and two-phase frictional pressure gradient were evaluated and the effects of heat flux, mass flux, and vapor quality were studied, respectively. Both experimental data were compared with existing correlations. Most correlations did not provide reliable predictions except under certain limited conditions.
허철(Cheol Huh),김무환(Moo Hwan Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
The objective of the present investigation is to study the hydrodynamic and thermal characteristics of flow boiling in a rectangular microchannel with 133 ㎛ hydraulic diameter. A polymer based PDMS microchannel and piecewise serpentine platinum microheater array on the glass substrate were fabricated by using MEMS technique. A series of platinum microheaters perform a role not only of a heater but also of a temperature sensor (RTD) along the flow passage. To get a real time flow visualization of flow pattern during the phase change phenomena and bubble growth behavior in a microchannel, high speed CCD camera and high resolution CCD was used. By careful design and construction of the experimental apparatus, the local heat transfer of flow boiling is experimentally investigated using distilled water, in a single rectangular microchannel, with about 133 ㎛ hydraulic diameter.