• Title/Summary/Keyword: Bio-Jet Fuel

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Analysis on Ignition Characteristics According to the Chemical Composition of Bio Jet Fuel Synthesized by F-T Process (F-T 공정으로 합성된 바이오항공유의 화학적 조성에 따른 점화특성 분석)

  • Kang, Saetbyeol
    • Clean Technology
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    • v.26 no.3
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    • pp.204-210
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    • 2020
  • In this study, the ignition characteristics of bio jet fuel (Bio-7629, Bio-5172) produced by F-T process and petroleum-based jet fuel (Jet A-1) were compared and analyzed. The ignition delay time of each fuel was measured by means of a combustion research unit (CRU) and the results were explained through an analysis of the properties and composition of the fuel. The ignition delay time of Bio-5172 was the shortest while that of Jet A-1 was the longest because Jet A-1 had the highest surface tension and Bio-5172 had the lowest viscosity in terms of fuel properties that could affect the physical ignition delay time. As a result of the analysis of the constituents' type and ratio, 22.8% aromatic compounds in Jet A-1 could generate benzyl radical, which had low reactivity during the oxidation reaction, affecting the increase of ignition delay time. Both Bio-7629 and Bio-5172 were composed of paraffin only, with the ratio of n-/iso- being 0.06 and 0.80, respectively. The lower the degree of branching is in paraffin, the faster the isomerization of peroxy radical is produced during oxidation, which could determine the propagation rate of the ignition. Therefore, Bio-5172, composed of more n-paraffin, possesses shorter ignition delay time compared with Bio-7629.

Analysis on Ignition Delay Time According to the Ratio of Bio-aviation Fuel in Jet A-1 Mixture (바이오항공유의 함량 변화에 따른 점화지연특성 분석)

  • Kang, Saetbyeol;Jeong, Byunghun
    • Journal of the Korean Society of Propulsion Engineers
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    • v.23 no.2
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    • pp.13-20
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    • 2019
  • In this study, the ignition delay time of blended aviation fuels was measured and analyzed to confirm the characteristic of ignition delay according to the blending ratio of bio-aviation fuel to petroleum-based aviation fuel. The ignition delay time of bio-aviation fuel(Bio-6308) was shorter than that of petroleum-based aviation fuel(Jet A-1) at all measured temperatures; further, the ignition delay time of the blended aviation fuels shortened as the ratio of Bio-6308 increased. It was confirmed that the aromatic compounds constituting the Jet A-1 affect these results; this was done by comparing the obtained ignition delay time with that of n-heptane/Toluene.

The Status of Production and Usage of Bio-Jet Fuel (바이오항공유 생산 및 사용현황)

  • Young-Kwan, Lim;Jin-Woo Doe
    • Applied Chemistry for Engineering
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    • v.34 no.5
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    • pp.472-478
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    • 2023
  • The usage of jet fuel has been increasing with increasing passenger and logistics movements under globalization. CO2, which is the main global warming gas from aircraft, was charged about 3.5% of total global CO2 emissions and 12% of transportation fuel emissions. For these reasons, a lot of governments and the international civil aviation organization (ICAO) are trying to reduce CO2 emissions via the introduction of bio-jet fuel. In this paper, we showed the jet fuel properties, specifications, and presentative production methods of bio-jet fuel such as alcohol to jet (ATJ), oil to jet (OTJ), gas to jet (GTJ) and sugar to jet (STJ). Also, we described the status of global and domestic bio-jet fuel usage and the policy plan for efficient distribution.

Ignition Characteristics of Petroleum-based and Bio Aviation Fuel According to the Change of Temperature and Pressure (온도와 압력의 변화에 따른 석유계 및 바이오항공유의 점화특성 분석)

  • Kang, Saetbyeol
    • Clean Technology
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    • v.25 no.3
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    • pp.238-244
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    • 2019
  • In this study, the ignition characteristics of petroleum-based aviation fuel (Jet A-1), bio aviation fuel (Bio-6308), and blended aviation fuel (50:50, v:v) were analyzed in accordance with change of temperature and pressure. The ignition delay time of each aviation fuel was measured by combustion research unit (CRU) and the compositions of the fuels were analyzed by GC/MS and GC/FID for qualitative and quantitative results. From the results, it was confirmed that the ignition delay times of all aviation fuels were shortened with increasing temperature and pressure. In particular, the effect of temperature was larger than the effect of pressure. Also, the ignition delay time of Jet A-1 was the longest at all measurement conditions, and it was judged that this result is because of the structurally stable characteristics of the benzyl radical generated during the oxidation reaction of the aromatic compound (about 22.48%) in Jet A-1. Also, it was confirmed that Jet A-1 had no section where the degree of shortening of ignition delay time was decreased by increasing temperature, which was because the benzyl radical inhibits the response that can affect the negative temperature coefficient (NTC). The ignition characteristics of blended aviation fuel (50:50, v:v) showed a similar tendency to those of Jet A-1, rather than to those of Bio-6308, so that the blended aviation fuel (50:50, v:v) can be applied to the existing system without any change.

Bio-Jet Fuel Production Technologies for GHG Reduction in Aviation Sector (항공분야 온실가스 감축을 위한 바이오항공유 제조기술)

  • KIM, JAE-KON;PARK, JO YONG;YIM, EUI SOON;MIN, KONG-IL;PARK, CHEON-KYU;HA, JONG-HAN
    • Journal of Hydrogen and New Energy
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    • v.26 no.6
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    • pp.609-628
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    • 2015
  • Thie study presents the biomass-derived jet (bio-jet) fuel production technologies for greenhouse gas (GHG) reduction in aviation sector. The aviation sector is responsible for the 2% of the world anthropogenic $CO_2$ emissions and the 10% of the fuel consumption: airlines' costs for fuel reach 30% of operating costs. In addition, the aviation traffic is expected to double within 15 years from 2012, while fuel consumption and $CO_2$ emissions should double in 25 years. Biojet fuels have been claimed to be one of the most promising and strategic solutions to mitigate aviation emissions. This jet fuel, additionally, must meet ASTM International specifications and potentially be a100% drop-in replacement for current petroleum jet fuel. In this study, the current technologies for producing renewable jet fuels, categorized by alcohols-to-jet, oil-to-jet, syngas-to-jet, and sugar-to-jet pathways are reviewed for process, economic analysis and life cycle assessment (LCA) on conversion pathways to bio-jet fuel.

Catalysts for Hydroisomerization of Synthesis-Oil for Bio-jet fuel Production (Bio-jet fuel 제조용 합성원유 수첨이성화 촉매)

  • Yun, So-Young;Lee, Eun-Ok;Park, Young-Kwon;Jeon, Jong-Ki;Jeong, Soon-Yong;Han, Jeong-Sik;Jeong, Byung-Hun
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2010.11a
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    • pp.795-796
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    • 2010
  • Interest has been increasing worldwide in Fischer-Tropsch synthesis (F-T) as a method of producing synthetic liquid fuels from biomass. Hydroisomerization of $C_7-C_{15}$ paraffins applies to production of diesel fuel with high cetane number and improved cold flow properties, such as viscosity, pour point and freezing point. The commercial products such as fuel jet produced from F-T synthesis should have low freezing and pour points. In this study, our major aim is to develop a catalyst for hydroisomerization of synthesis-oil for bio-jet fuel. Effects of zeolites and platinum loading on hydroisomerization of dodecane were investigated as a model reaction in a batch reactor.

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Analysis on Ignition Delay Characteristics of Bio Aviation Fuels Manufactured by HEFA Process (HEFA 공정으로 제조된 바이오항공유의 점화지연특성 분석)

  • Kang, Saetbyeol
    • Korean Chemical Engineering Research
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    • v.57 no.5
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    • pp.620-627
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    • 2019
  • In this study, ignition delay characteristics of various bio aviation fuels (Bio-ADD, Bio-6308, Bio-7720) produced by HEFA process using different raw materials were compared and analyzed. In order to confirm the feasibility of applying bio aviation fuel to actual system, ignition delay characteristics of petroleum-based aviation fuel (Jet A-1) and blended aviation fuel (50:50, v:v) also analyzed. Ignition delay time of each aviation fuel was measured by using CRU, surface tension measurement and GC/MS and GC/FID analysis were performed to interpret the results. As a result, ignition delay time of Jet A-1 was the longest at all temperature because it contains aromatic compounds about 22.8%. The aromatic compounds can produce benzyl radical which is thermally stable and has low reactivity with oxygen during decomposition process. In the case of bio aviation fuels, ignition delay times were measured similarly because the ratio of n-paraffin/iso-paraffin constituting each aviation fuel is similar (about 0.12) and the composition ratio of cycloparaffin also has no difference. In addition, ignition delay times of blended aviation fuels (50:50, v:v) were measured close to the mean value those of each fuel so it was confirmed that it can be applied without any changing or improving of existing system.

Reaction characteristics of hydrocarbon fuels under various operation conditions of hydro-upgrading process for vegetable oil-based bio-jet fuel production (식물성 오일 기반 바이오항공유 제조공정에서 수소첨가 업그레이딩을 위한 운전조건에 따른 탄화수소화합물의 특성)

  • Kwak, Yeonsu;Jang, Jung Hee;Kim, Sungtak;Ahn, Minhwei;Lee, Eun-Sil;Han, Gi Bo;Jeong, Byung Hun;Han, Jeong Sik;Jeon, Cheol-Hwan
    • Journal of the Korean Applied Science and Technology
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    • v.35 no.3
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    • pp.731-743
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    • 2018
  • In bio-jet fuel production, selecting operating conditions of hydro-upgrading is of great importance to make iso-Paraffin rich hydrocarbons with carbon distribution including jet fuel range. Herein, iso-Paraffin rich biofuel including jet fuel range hydrocarbons ($C_8-C_{16}$) is produced from simultaneous cracking and isomerization using n-Paraffin rich hydrocarbon derived from hydrotreated vegetable oil over 0.5 wt..% Pt/Zeolite catalyst. We report and analyze the yields and compositions in the produced hydrocarbons affected by various operating conditions, such as reaction temperature, reaction pressure, molar ratio of reactants, and weight hourly space velocity. Aforementioned operating conditions not only can help interpret the reaction dynamics of hydro-upgrading, but also further produce bio jet-fuel after distillation.

Development of Jet-Fuel Using Petroleum Displacement Resources (석유대체자원을 이용한 항공유제조기술)

  • Jeong, Soon-Yong;Kim, Chul-Ung;Jeong, Kwang-Eun;Koh, Jae-Cheon;Chae, Ho-Jeong;Kim, Tae-Wan;Park, Hyun-Joo;Lee, Sang-Bong;Han, Jeong-Sik;Jeong, Byung-Hun
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2010.11a
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    • pp.307-310
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    • 2010
  • The research for production of jet fuel from petroleum displacement resources such as bio-mass, coal, natural gas mainly consists of three sub-research areas; the fisrt step is the pretreatment for producing a synthetic gas, and the next step is the Fischer-Trophsh reaction process for making hydrocarbons. The last is the upgrading technology for the hydrocarbons to fit a jet fuel specification via cracking and isomerization reactions. This talk presents reaserch trends and main technologies for production of jet fuel derived from petroleum displacement resources.

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Comparison of Ignition Delay Time of Petroleum-based and Bio Aviation Fuel (석유계 및 바이오 항공유의 점화지연시간 비교)

  • Kang, Saetbyeol;Han, Jeongsik;Jeong, Byunghun
    • Journal of the Korean Society of Propulsion Engineers
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    • v.22 no.6
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    • pp.118-125
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    • 2018
  • This study aimed to obtain data for a comparative analysis of the properties of bio aviation fuel to be developed in the future by measuring and comparing the ignition delay times of various presently used aviation fuels. In the case of petroleum-based aviation fuel, the ignition delay time of exo-THDCP was 4.92 ms, which was 3.42 times longer than 1.44 ms of Jet A-1 at $590^{\circ}C$ / 55 bar. In the case of foreign bio aviation fuel, the ignition delay time of 11POSF7629 was the longest (1.16 ms), while the ignition delay time of 10POSF6308 (1.06 ms), 12POSF7720 (1.07 ms), and 07POSF5172 (1.05 ms) were similar.