• Title/Summary/Keyword: $CO_2$ 가스

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Rheological Properties of Dough Added with Barley Bran (보리등겨 첨가 반죽의 물성변화)

  • Choi, Ung-Kyu;Yoo, Byung-Hyuk;Son, Dong-Hwa;Kwon, Dae-Jun;Kim, Mi-Hyang;Kim, Young-Ho
    • Korean Journal of Food Science and Technology
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    • v.37 no.5
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    • pp.751-756
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    • 2005
  • Effect of barley bran flour on bread quality was investigated. With addition of barley bran flour, crude protein and ash contents of bread increased, and color of crumb and crust became darker than control group made with pure wheat flour. Content of dietary fiber in bread made with 5% barley bran flour was twofold higher than that of control group. Hardness of bread increased and volume decreased in proportion to bran content. Sensory qualities of 5% barley bran flour-added group and control group were not significantly different, but decreased in 10 and 15% barley bran flour-added groups, revealing optimal content of barley bran flour to be 5%.

A Study on the Effects of Hydrogen Addition and Swirl Intensity in CH4-Air Premixed Swriling Flames (메탄-공기 예혼합 선회화염에서 수소첨가와 선회강도 영향에 관한 연구)

  • KIM, HAN SEOK;CHO, JU HYEONG;KIM, MIN KUK;HWANG, JEONGJAE;LEE, WON JUNE
    • Transactions of the Korean hydrogen and new energy society
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    • v.30 no.6
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    • pp.593-600
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    • 2019
  • The combustion characteristics of methane/hydrogen pre-mixed flame have been investigated with swirl stabilized flame in a laboratory-scale pre-mixed combustor with constant heat load of 5.81 kW. Hydrogen/methane fuel and air were mixed in a pre-mixer and introduced to the combustor through a burner nozzle with different degrees of swirl angle. The effects of hydrogen addition and swirl intensity on the combustion characteristics of pre-mixed methane flames were examined using particle image velocimetry (PIV), micro-thermocouples, various optical interference filters and gas analyzers to provide information about flow velocity, temperature distributions, and species concentrations of the reaction field. The results show that higher swirl intensity creates more recirculation flow, which reduces the temperature of the reaction zone and, consequently, reduces the thermal NO production. The distributions of flame radicals (OH, CH, C2) are dependent more on the swirl intensity than the percentage of hydrogen added to methane fuel. The NO concentration at the upper part of the reaction zone is increased with an increase in hydrogen content in the fuel mixture because higher combustibility of hydrogen assists to promote faster chemical reaction, enabling more expansion of the gases at the upper part of the reaction zone, which reduces the recirculation flow. The CO concentration in the reaction zone is reduced with an increase in hydrogen content because the amount of C content is relatively decreased.

Leaching of Ruthenium by Electro-generated Chlorine Gas by Electrochemical Method (전기화학법(電氣化學法)에 의해 생성(生成)된 전해생성(電解生成) 염소(鹽素)를 이용한 루테늄의 침출(浸出))

  • Ahn, Jong-Gwan;Lee, Ah-Rum;Kim, Min-Seuk;Ahn, Jae-Woo;Lee, Jae-Ryeoung
    • Resources Recycling
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    • v.22 no.6
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    • pp.55-63
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    • 2013
  • In this study, a electrochemical-chemical combined dissolution technology was conducted by electro-generated chlorine to obtain ruthenium solution from ruthenium metal. To find out the optimum leaching conditions of ruthenium in chloride solution, this leaching process was carried out on the variation of pH, reaction time, temperature and applied voltage at the electro-generated chlorine system in the reaction bath. Also, ozone generator was used to obtain ruthenium(III) chloride solution to increase the leaching rate. The optimum condition was observed at pH 10.0, $40^{\circ}C$ within 1 hr of reaction time that more than 88% of ruthenium(III) chloride dissolved.

An Analysis of Installation of Railway Construction Project Management System on Carbon Reduction (철도건설 사업관리시스템 도입에 따른 탄소저감 효과 분석)

  • Park, Jun-Tae;Ahn, Tae-Bong
    • Journal of the Korean Society for Railway
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    • v.20 no.3
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    • pp.382-388
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    • 2017
  • In response to the global warming crisis, the Kyoto protocol was established by major developed countries in 1997. The Paris Agreement, which imposes a carbon reduction obligation for both developed countries and developing countries, was signed in 2015. Regulations and efforts to reduce greenhouse gas emissions accordingly have been implemented. In this study, we analyzed the reduction of carbon emissions computerizing of the traditional project management system for efficient railway construction at Korea Rail Network Authority. We suggest a model that measures two major effects of carbon reduction, stemming from transportation and from a decrease of paper use. In this paper, we calculate the amount of carbon reduction and the economic effect of carbon reduction with application of the construction project management system at Korea Rail Network Authority. The model and methodology in this study are expected to be helpful to measure the carbon reduction performance for similar e-transformation.

Gas Permeation Study of Fuel Hose Composed as Inner Material of FKM Rubber (FKM 고무를 내층재료로 한 연료호스의 가스 투과성 연구)

  • Kim, Do-Hyun;Doh, Kyung-Hwan;Park, Hyun-Ho;Lee, Chang-Seop
    • Elastomers and Composites
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    • v.40 no.2
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    • pp.83-92
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    • 2005
  • To develop an automotive fuel hose suitable to the international environmental regulation, FKM rubber materials as an inner material of fuel hole were prepared with different chemical compositions. Measurement of the properties of thermal resistance, oil resistance, fuel resistance, gas permeability including fundamental properties were performed to investigate compatibility for a fuel hose material. Fundamental properties, thermal resistance, oil resistance, fuel resistance and permeability of FKM rubber materials were improved with fluorine content. When the carbon content was 20 phr, FKM compounds with fluorine contents of 66%, 09% and 71% were shown to satisfy the specification oi fuel hose. The gas permeability of NBR and FKM compounds was measured on the mixed fuel oils prepared with isooctane-toluene and gasoline-methanol. FKM rubber materials showed a small difference in penetrated amount of fuel and showed a permeability superior to NBR material. he permeability of FKM rubber materials was not influenced by the contents of fuel oil. Thermal properties of 69% FKM rubber experienced by permeability testing were not variated.

Analysis of GHG Reduction Potential on Road Transportation Sector using the LEAP Model - Low Carbon Car Collaboration Fund, Fuel Efficiency, Improving Driving Behavior - (LEAP 모형을 이용한 도로교통부문의 온실가스 감축잠재량 분석 - 저탄소차협력금제도, 연비강화, 운전행태개선을 중심으로 -)

  • Kim, Min wook;Yoon, Young Joong;Han, Jun;Lee, Hwa Soo;Jeon, Eui Chan
    • Journal of Climate Change Research
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    • v.7 no.1
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    • pp.85-93
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    • 2016
  • This study the efficiency of greenhouse gas reduction of 'low carbon car collaboration fund' and its alternative 'control of average fuel efficiency and greenhouse gas', and 'improving driving behavior' were analyzed by using LEAP, long term energy analysis model. Total 4 scenarios were set, baseline scenario, without energy-saving activity, 'low carbon car collaboration fund' scenario, 'fuel efficiency improving scenario', and 'improving driving behavior' scenario. The contents of analysis were forecast of energy demand by scenario and application as well as reduction of greenhouse gas emission volume, and the period taken for analysis was every 1 year during 2015~2030. Baseline scenario, greenhouse gas emission volume in 2015 would be 7,935,697 M/T and 13,081,986 M/T in 2030, increased 64.8%. The analysis result was average annual increase rate of 3.4%. The expected average annual increase rate of other scenarios was, 'low carbon car collaboration fund' scenario 1.7%, 'fuel efficiency improving' scenario 3.0%. and 'improving driving behavior' scenario 3.4%. and these were each 1.7%, 0.3%. 0.3% reduce from baseline scenario. The largest reduction was 'low carbon car collaboration fund' scenario, and there after were 'fuel efficiency improving scenario', and 'improving driving behavior' scenario.

High-Temperature Corrosion Behavior of Alloy 617 in Helium Environment of Very High Temperature Gas Reactor (초고온가스로 헬륨 분위기에서 Alloy 617의 고온 부식 거동)

  • Lee, Gyeong-Geun;Jung, Sujin;Kim, Daejong;Jeong, Yong-Whan;Kim, Dong-Jin
    • Korean Journal of Metals and Materials
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    • v.50 no.9
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    • pp.659-667
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    • 2012
  • Alloy 617 is a Ni-base superalloy and a candidate material for the intermediate heat exchanger (IHX) of a very high temperature gas reactor (VHTR) which is one of the next generation nuclear reactors under development. The high operating temperature of VHTR enables various applications such as mass production of hydrogen with high energy efficiency. Alloy 617 has good creep resistance and phase stability at high temperatures in an air environment. However, it was reported that the mechanical properties decreased at a high temperature in an impure helium environment. In this study, high-temperature corrosion tests were carried out at $850^{\circ}C-950^{\circ}C$ in a helium environment containing the impurity gases $H_2$, CO, and $CH_4$, in order to examine the corrosion behavior of Alloy 617. Until 250 h, Alloy 617 specimens showed a parabolic oxidation behavior at all temperatures. The activation energy for oxidation in helium environment was 154 kJ/mol. The SEM and EDS results elucidated a Cr-rich surface oxide layer, Al-rich internal oxides and depletion of grain boundary carbides. The thickness and depths of degraded layers also showed a parabolic relationship with time. A normal grain growth was observed in the Cr-rich surface oxide layer. When corrosion tests were conducted in a pure helium environment, the oxidation was suppressed drastically. It was elucidated that minor impurity gases in the helium would have detrimental effects on the high-temperature corrosion behavior of Alloy 617 for the VHTR application.

Liquefaction Evaluation by One-Dimensional Effective Stress Analysis Using UBC3D-PLM Model (UBC3D-PLM 모델을 이용한 1차원 유효응력해석에 의한 액상화 평가)

  • Jung-Hoe Kim;Hyun-Sik Jin
    • The Journal of Engineering Geology
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    • v.33 no.1
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    • pp.151-167
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    • 2023
  • This study compares the revised method in loose saturated sandy ground where the LNG storage tank will be installed with an evaluation method by one-dimensional effective stress analysis using the UBC3D-PLM model. Various laboratory and field tests were conducted to establish the parameters necessary for evaluation. The revised liquefaction evaluation method using the seismic response analysis result and N value from standard penetration testing evaluated the possibility of liquefaction as high, but assessment using effective stress analysis, which can consider various liquefaction resistance factors, found the site to be somewhat stable against liquefaction. One-dimensional finite element analysis using UBC3D-PLM modeling facilitated easier assessment of stability against liquefaction than the other methods and minimized the area required for reinforcement against liquefaction. In addition, it is expected that two-and three-dimensional numerical analysis considering the foundation of the LNG storage tank can identify the seismic design and behavior when liquefaction occurs.

A Study on Operational Improvements for Reducing Carbon Emissions from Aviation (항공 탄소 배출 감소를 위한 운영 개선 방안 연구)

  • Sung-Mi Kim;Eun-Mi Kim;Sang-Hoon Lim;Ho-Won Hwang
    • Journal of Advanced Navigation Technology
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    • v.27 no.1
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    • pp.119-125
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    • 2023
  • It is necessary to reduce aviation GHG(CO2) emission to ensure aviation sustainable development. Operational improvements may not contribute significantly to carbon reduction but it can sustatially reduce emission in a short term. ICAO has developed GANP and ASBU to optimize operations and countries are making efforts to expand infrastructure and develop technology. The legal barriers to operational improvement are based on the notion of state sovereignty under the Chicago Convention which allows countries to control inefficiencies based on borders or limit or prohibit the passage of aircraft. Chicago Convention does not grant unlimited freedom of air sovereignty and if the concept of state sovereignty is interpreted according to the times it is possible to achieve smooth operational improvement.

Trend and Prospect of Scrubber Technology for Regulatory on Sulfur Content in Marine Fuel Oil (선박 연료의 황 함유량 규제에 따른 스크러버 기술의 동향과 전망)

  • Eom, Hanki;Park, Byung Hyun;Jeong, Soon-Kwan;Kim, Sung Su
    • Prospectives of Industrial Chemistry
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    • v.22 no.5
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    • pp.1-13
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    • 2019
  • 국제해사기구(IMO, international maritime organization)는 2015년부터 배출규제해역(ECA, emission control area)을 운항하는 선박은 황 함유량이 0.1%(m/m) 이하로 강화된 기준을 만족하는 연료를 사용해야 하며, 2020년부터는 모든 선박에 대해 황 함유량이 0.5%(m/m) 이하인 연료를 사용하거나 동등 이상의 성능을 갖는 배출가스 후처리 장치의 설치를 의무화하였다. 이에 따라, 선박에서 배출되는 오염물질을 제어할 수 있는 다양한 기술이 개발되고 있으며, 후처리 관점에서 습식 스크러버(wet scrubber)는 선박의 디젤 엔진에서 배출되는 이산화황(sulfur dioxide)을 저감시키기 위한 가장 적합한 해결책으로 알려져 있다. 습식 스크러버는 해수를 사용하는 개방형 스크러버(open loop scrubber)와 화학세정수를 사용하는 폐쇄형 스크러버(closed loop scrubber)로 구분된다. 습식 스크러버는 오염물질의 효율적인 처리가 가능하지만 유지보수비가 비싸고, 폐수 발생으로 인한 2차 오염발생 및 부식에 매우 취약한 단점이 있다. 따라서 최근에는 스크러버 내부의 부식을 방지하기 위한 내부식성 재질에 관한 연구와 흡수제(absorbent)의 고도화 연구가 활발히 진행되고 있다. 또한, 하이브리드형 스크러버(hybrid scrubber)는 개방형과 폐쇄형 스크러버의 장점을 결합한 기술로 황산화물의 배출을 규제하는 배출규제해역에서는 폐쇄형 스크러버를 가동하고, 선박이 공해상으로 진입할 경우 개방형 스크러버로 전환함에 따라 황산화물 배출 및 반응 후 세척수의 폐수배출 기준을 동시에 만족할 수 있다.