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경기육괴 철원지역 페그마타이트 내 망간-철 인산염광물의 광물-지화학적 특징 및 진화과정
김규보,최선규,서지은,김창성,김지원,구민호,Kim, Gyoo Bo,Choi, Seon Gyu,Seo, Jieun,Kim, Chang Seong,Kim, Jiwon,Koo, Minho 대한자원환경지질학회 2017 자원환경지질 Vol.50 No.3
철원 갈말-김화 지역의 쥐라기 복운모 화강암체 내 페그마타이트에서는 다양한 망간-철 인산염광물의 집합체가 산출되고 있으며, 후기 마그마 단계로부터 열수단계 및 지표 풍화 단계에서 다양한 광물상의 변화가 유도되었다. 철원 복운모 화강암은 낮은 대자율 값을 갖는 전형적인 S-형 화강암으로 중알루미나질~고알루미나질, 후-충돌대 환경을 나타내고 있다. 페그마타이트는 K-Ar 연대가 약 153 Ma로서 복운모 화강암의 K-Ar 연대($151{\pm}4Ma$)와 전반적으로 일치하고 있어 동일 기원의 마그마로 추정된다. 한편 갈말-김화 페그마타이트는 광물조성에 의한 분류기준에 의하면 백운모-희유원소 종, 리튬 세부종, 녹주석 유형에 속하는 녹주석-콜롬바이트-인산염광물으로 구분되며, LCT(Li-Cs-Ta) 계열에 해당한다. 망간 인산염광물 중 트리플라이트는 주로 후기 마그마 단계에 정출되었으며, 열수 단계에서는 망간 인산염광물의 변질광물인 루코포스파이트와 잔사이트로 정출되었다. 풍화 단계에서 트리플라이트는 포스퍼시더라이트와 망간 산화물로 교대되어 산출된다. Mn-Fe phosphate mineral complexes included within the pegmatite are observed at Jurassic Cheolwon two-mica granite in Gyeonggi Massif, South Korea. The genetic evolution between the Cheolwon two-mica granite and pegmatite, and various trend of Mn-Fe phosphate minerals is made by later magmatic, hydrothermal, and weathering process based on mineralogical, geochemical analysis. The Cheolwon two-mica granite is identified as S-type granite, considering its chemical composition (metaluminous ~ peraluminous), post-collisional environment, low magnetic susceptibility, and existence of biotite and muscovite. The K-Ar age (ca. 153 Ma) of pegmatite is well coincident with age of the Cheolwon two-mica granite ($151{\pm}4Ma$). It indicates that these two rocks are originated from the same magma. Pegmatite indicates the LCT geochemical signature, and was classified as muscovite-rare element class / Li subclass / beryl type / beryl-columbite-phosphate subtype pegmatite. The triplite $\{(Fe^{2+}{_{0.4}},Mn_{1.6})(PO_4)(F_{0.9})\}$ is dominant phosphates in later magmatic stage which partly altered to leucophosphite $\{KFe^{3+}{_2}(PO_4)_2OH{\cdot}2H_2O\}$ and jahnsite $\{(Fe^{3+}{_{0.7}},Mn_{2.3})(PO_4)_2OH{\cdot}4H_2O\}$ by hydrothermal alteration. In particular, near fractures, the triplite has been separatelty replaced by the phosphosiderite ($Fe^{3+}PO_4{\cdot}2H_2O$) and Mn-oxide minerals during weathering stage.
김규보,전충환,장영준,이석영,Kim Gyu-Bo,Jeon Choung-Hwan,Chang Young-Jun,Lee Suk-Young 한국마린엔지니어링학회 2004 한국마린엔지니어링학회지 Vol.28 No.7
An one-zone heat release analysis was applied to a 4 cylinder indirect injection diesel engine. The objective of the study is to calculate heat release accurately considering the effect of specific heat ratio. heat transfer and crevice model and to find out combustion characteristics of an indirect diesel engine considering the effect of the pressures in main and swirl chambers. Especially specific heat ratio indicating combustion characteristics is adapted. instead of that indicating matter properties, which has been used in former studies Moreover by adaption of blowby model, cylinder gas mass became accurately calculated. Therefore, with ideal gas equation, calculating cylinder gas temperature, it was found to affect heat transfer loss and heat release. Determining heat transfer constants $C_1$. $C_2$ as 0.6 respectively. the integrated gross heat release values were predicted well for the measured value at various engine speed, full load operating conditions. The curve of heat release rate was similar to SI engine rather than DI engine. That is originated from that swirl chamber reduce an instant combustion which occurs in DI engine due to ignition delay on early stage of combustion.
커먼레일 직접분사식 디젤엔진에서 시분해 레이저 유도 백열법을 이용한 매연입자의 배출 특성
김규보,한휘영,장영준,전충환,Kim, Gyu-Bo,Han, Hwi-Young,Chang, Young-June,Jeon, Chung-Hwan 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.5
Recently, diesel vehicles have been increased and their emission standards have been getting strict. The emission of diesel vehicles contains numerous dangerous compounds, especially particulate matters cause a serious environmental pollutant and affect to human health seriously. Thousands of studies have already reported that particulate matters are associated with respiratory and cardiovascular diseases, and death. Due to these, it is necessary to measure the soot concentration and soot particle size in laboratory flames or practical engines to recognize the soot formation, and develop the control strategies for soot emission. In this study, the characteristics of exhausted soot particle size and volume fraction from 2.0L CRDI diesel engine have been investigated as varying engine speed and load. Laser induced incandescence has been used to measure soot concentration. Time-resolved laser induced incandescence has been used to determine soot particle size in the engine. The soot volume fraction is increased as increasing engine load but soot volume fraction is decreased as increasing engine speed. The primary particle size is distributed about $35nm{\sim}60nm$ at each experimental conditions.
메탄올 개질 연료의 배기 배출물 특성에 관한 실험적 연구
김규보(Gyu-bo Kim),최승환(Seung-hwan Choi),장영준(Young-jun Chang),전충환(Chung-hwan Jeon) 한국자동차공학회 2002 한국자동차공학회 지부 학술대회 논문집 Vol.2002 No.10
As environmental and energy concerns are forcing emission standards to tighten, it is necessary to develop low-emission vehicles, for example by modifying combustion processes, adding exhaust aftertreatments and changing fuel composition. In this experimental study, the effect of methanol-reformulated fuel by changing fuel composition on exhaust emission characteristics for cold-start phase which is the first part of FTP 75 mode and transient phase which is acceleration and deceleration by using methanol reformulated fuel in a four-stroke DOHC I.8L S.I. engine were studied. The results show that methanol reformulated fuel is better emission reduction of 38% and 55% over than that of net gasoline in HC and CO emissions at cold-start phase, but NOx emission increase about 16% than that of net gasoline. At transient phase, methanol reformulated fuel is better emission reduction than that of net gasoline in HC, CO and NOx.<br/>
메탄올 개질 연료를 이용한 SI 엔진의 성능 및 배기배출물 특성 연구:냉시동 특성
김규보(Gyu-bo Kim),최승환(Seung-hwan Choi),김태한(Tae-han Kim),장영준(Young-june Chang),전충환(Chung-hwan Jeon) 한국자동차공학회 2002 한국자동차공학회 지부 학술대회 논문집 Vol.2002 No.3
As environmental and energy concerns are forcing emission standards to tighten, it is necessary to develop low-emission vehicles, for example by modifying combustion processes, adding exhaust aftertreatments and changing fuel composition. In this experimental study, the effect of methanol-reformulated fuel by changing fuel composition on engine performance and exhaust emission characteristics for cold-start phase which is the first part of FTP 75 mode by using methanol reformulated fuel in a four-stroke DOHC 1.8L S.l. engine were studied. The results show that methanol reformulated fuel is better emission reduction of 38% and 55% over than that of net gasoline especially in HC and CO emissions at cold-start phase. But NOx emission increase about 16% than that of net gasoline<br/>
김규보(Gyu-bo Kim),이석영(Suk-young Lee),박호준(Ho-jun Park),장영준(Young-june Chang),전충환(Chung-hwan Jeon) 한국자동차공학회 2003 한국자동차공학회 지부 학술대회 논문집 Vol.2003 No.5
At this study, dynamic characteristics of fuel injection system analysis using computational simulation was carried out. The fuel injection system is inline injection system in a diesel engine. Analysis of dynamic characteristics was based on continuity equations and momentum equations, and to solve equations used the method of characteristics. For conviction of simulation accuracy carried out experimental study by fuel injection test machine. A comparison with experimental and computational results was made with similarity. Detailed prediction results used the simulation show dynamic characteristics of fuel injection system very well.<br/>
김규보(Gyu-Bo Kim),김량균(Rang-Gyun Kim),임호(Ho Lim),박영도(Young-Do Park) 한국환경에너지공학회 2022 한국열환경공학회 학술대회지 Vol.2022 No.2
LNG는 대량운송 및 저장을 위해 천연가스를 -l62°C 로 냉각시켜 LNG 터미널에 저장해 두었다가 일반적으로 해수식 기화기 를 이용하여 LNG를 기화시켜 NG 인 가스상태로 수요처에 공급하게 된다. 이 와 같이 재기화 되는 과정에서 약 200kcal/kg의 냉열이 버려지는 것으로 알려져 있다. 이러한 냉열은 공기액화, 냉열발전, 저온분해, 액화탄산, 저온창고, 지역난방 둥 다양하게 활용할 수 있다. 특히 냉열발전의 경우 일본을 중심으로 가장 많이 활용되는 기술이며, 그와 유사하게 공기액화를 위해 LNG 냉열을 이용하는 기술은 폭넓게 분포되어 활용되는 기술이다. 본 연구에서는 냉열발전에 대해 open source 프로그램 중 하나인 DWSIM을 이용하여 공정특성을 분석하였다. 250t/h급 75kg/cm2, -140°C 의 LNG롤 해수를 이용하여 재기화 후 터빈을 이용해 65 kg/cm2으로 NG를 송출할 경우, 약 879 kW를 얻을 수 있는 것으로 평가되었고, 해수를 이 용해 재기화 후 이산화탄소를 포집하기 용이하도록 이산화탄소가 포함된 고온(370°C)의 배출가스 200,000 Nm3/h로 재 기화를 추가로 시 킬 경우. 약 1,200 kW 의 전력을 얻을 수 있는 것으로 평가되었다. 기화기의 경우는 shell&Tube 타입의 열교환기 를 적용하였고, 해수 온도는 20'C 에 공급되 어 약 10°C 로 배출되도록 하였고, 7 kg/cm2 의 압력으로 1,000 t/h가 공급되도록 하였다. LNG 냉열발전의 경우, 기 술에 대한 가능성을 확인되었으나. 전력발생량 대비 경제성에 대한 평가가 반드시 필요할 것으로 사료된다.