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[연료 및 윤활유부문] 커먼레일 시스템에서 DME의 분무특성
황진식(Jinsik Hwang),하종석(Jongsuk Ha),노수영(Sooyoung No) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_1
Dimethyl Ether(DME) has been to be a very promising alternative oxygenate fuel, which gives low emissions and good economy in the application to direct injection Diesel engine.<br/> Spray characteristics such as spray angle, penetration and Sauter mean daimter of DME in common rail injection system is investigated with the single hole nOZ7Je with orifice diameter 0.4mm and with the variation of ambient pressure.<br/> The experimental results of spray tip penetration was not coincident with that of the empirical equation suggested by Hiroyasu et al. Spray angle increased with the increase in the ambient pressure. Spray tip penetration was not affected by the injection duration time. The measured at 60do and 80do from the nozzle tip revealed in the range of 1.6-1.8??. There was no effect of ambient pressure on SMD. The development of correlation for the spray tip penetration of DME spray is required.<br/>
커먼레일 분사 시스템 조건하에서의 DME 분무특성(Ⅰ)
황진식(Jinsik Hwang),하종석(Jongsuk Ha),노수영(Sooyoung No) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_1
Dimethyl Ether(DME) has been known as a very promising alternative oxygenate fuel, which gives low emissions and good economy in the application to direct injection Diesel engine. In this study, spray characteristics such as spray angle, spray tip penetration of DME in common rail injection system were investigated with the single hole nozzle with orifice diameter of 0.2, 0.3, 0.4mm and with the variation of ambient pressure of 0.6, 1.0 and 1.5MPa.<br/> The spray characteristics were measured by PMAS(Particle Motion Analysis System) which is employing a point measurement technology. The spray angle measured at both 30do from the nozzle tip increased with the increase in the ambient pressure. An increase in the ambient pressure results in a decrease of spray tip penetration of DME. The experimental results of spray tip penetration were compared with the calculated one from the empirical correlations. The experimental results of spray tip penetration were coincident with the calculated one with Wakuri et al.'s correlation based on the momentum theory
바이오에탄올 생산을 위한 폐MDF의 전처리 및 효소 당화
강양래(Yang-Rae Kang),황진식(Jin-Sik Hwang),배기한(Ki-Han Bae),조훈호(Hoon-Ho Cho),이은정(Eun-Jeong Lee),조영손(Young-Son Cho),남기두(Ki-Du Nam) 한국생물공학회 2015 KSBB Journal Vol.30 No.6
The objective of this study was designed to determine the possibility of bioethanol production from wasted medium density fiberboard (wMDF). We were investigated the enzymatic saccharification characteristics using the enzyme (Cellic CTec3) after pretreatment with sodium chlorite. According to the component analysis results, the lignin contents before and after the pretreatment of wMDF (milling using sieve size of 1,000 μm) was significantly reduced from 31.13% to 4.11%. Therefore, delignification ratio of pretreated wMDF was found to be up to about 87-89% depending on the sieve size. And we were tested to compare the saccharification ratio according to the sieve size of wMDF (1,000 μm, 200 μm), but it was no significance depending on the sieve size. When enzyme dosage was 5% based on the substrate concentration, enzymatic saccharification ratio was obtained up to 70% by maintaining at 50℃ for 72 hours. We could made the substrate concentration of pretreated wMDF (1,000 μm) up to 12% and then enzymatic saccharification ratio was 76.8%, also contents of glucose and xylose were analyzed to 77,750 and 14,637 mg/L, respectively.
강양래(Yang-Rae Kang),황진식(Jin-Sik Hwang),배기한(Ki-Han Bae),조훈호(Hoon-Ho Cho),이은정(Eun-Jeong Lee),조영손(Young-Son Cho),남기두(Ki-Du Nam) 한국생물공학회 2016 KSBB Journal Vol.31 No.1
The aim of this study attempted to verify the possibility of bioethanol production using wasted medium density fiberboard (wMDF). In order to produce bioethanol from wood cellulosic materials must be carried out the process of pretreatment, saccharification, fermentation and distillation. First, the wMDF was pretreated using sodium chlorite and pretreated wMDF was prepared to 8% slurry and then slurry was saccharified with the commercial enzyme (Cellic CTec3). The fermentable sugar and pH of saccharified substrate were about 5.5% glucose and 4.4, respectively. Herein we compared the results of ethanol yield according to the nutrients added or without addition to increase ethanol yield. Ethanol fermentation was finished in about 24 hours, but it was delayed in experimental group without nutrients. Ethanol content and fermentation ratio of the final fermented mash prepared by utilizing jar fermenter was 25.40 g/L and 86.64%, respectively. At this time, the maximum ethanol productivity was confirmed as 1.78 g/Lh (ethanol content 21.38 g/L, 12 h), and the overall ethanol productivity was 1.05 g/Lh (ethanol content 25.27 g/L, 24 h). Using fermented liquid we could produced bioethanol 95.37% by continuous distillator packed with copper element in laboratory scale. These results show that wMDF has a potential valuable for bioethanol production.
이은정,윤동경,오승가,전승호,이병진,배기한,황진식,강양래,조훈호,남기두,조영손 한국국제농업개발학회 2016 韓國國際農業開發學會誌 Vol.28 No.2
This study was conducted for recycling the waste MDF(Medium-density fibreboard) to investigate the enzymatic saccharification characteristics using two enzymes Novozyme Cellic® CTec2 and HTec2 (Novozymes, Bagsvaerd, Denmark) after the delignification by pretreatment using sodium chlorite. The chemical composition of the waste MDF are lignin, holocellulose, ash, and other extracts 28.40, 60.20, 0.10, and 11.30%, after pretreatment with sodium chlorite were 5.20, 53.10, 0.03, and 41.67%. The Lignin interferes with enzymatic saccharification of 23.2% was removed, 7.1% of holocellulose was lost. The times of sodium chlorite pretreatment and saccharification of the waste MDF was finished between 48-72 hours, the saccharification speed was fast when the concentration of the enzyme by 10% and the HTec2 CTec2 ratio 9:1. Sugar ratio of the solid content of the waste MDF is the highest as 69.6% when it comes out of 8% and a viscosity was as high as 34.8% when the 12-FB%. Therefore, the pre-treatment with sodium chlorite is more advantageous when enzymatic saccharification to lignocellulosic biomass. The amount of the enzyme, the solid-liquid ratio, and the reaction time showed a proportional relationship with saccharification efficiency. The studies for increasing the solids content of waste MDF to improve the economic efficiency more than 12% should accompanied.