• Title, Summary, Keyword: hydrocarbon decomposition

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Application of Thermal Plasma for Production of Hydrogen and Carbon Black from Direct Decomposition of Hydrocarbon (탄화수소의 직접분해로부터 수소와 카본블랙을 생성하기 위한 열플라즈마의 응용)

  • Lee, Tae-Uk;Nam, Won-Ki;Baeck, Sung-Hyeon;Park, Dong-Wha
    • Applied Chemistry for Engineering
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    • v.18 no.1
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    • pp.84-89
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    • 2007
  • Direct decomposition of hydrocarbon (methane, propane) was studied using a thermal plasma to produce high purity hydrogen and carbon black. Thermodynamic equilibrium compositions were calculated based on the minimization of Gibb's free energy, and decomposition experiments were performed on the basis of calculation results. The purity of hydrogen was found to be depended strongly on the flow rate of hydrocarbon. The decomposition conditions for high purity hydrogen were investigated. The purity of hydrogen produced from methane decomposition was higher than that from propane. In the case of propane, it was investigated that by products such as methane, acetylene, and ethane etc., by radical recombination under thermal plasma were produced more than that of methane. Produced carbon blacks were characterized by material analyses, such as XRD, Raman spectroscopy, SEM, and particle size analysis. In both methane and propane decompositions, well-crystallized carbon blacks were produced and showed uniform and sphere-like morphologies. The size of carbon black synthesized from methane was observed to be smaller than that from propane.

Characterization of Soot Produced from Thermal Decomposition of Hydrocarbon Fuel (탄화수소연료의 열분해 Soot발생특성 분석에 관한 연구)

  • KIM, HAKDUCK;KIM, CHANGYEAN;SONG, JUHUN
    • Transactions of the Korean hydrogen and new energy society
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    • v.27 no.6
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    • pp.747-752
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    • 2016
  • Soot and harmful exhaust gas produced by liquid hydrocarbon fuel caused various environmental problems. In this study, soot characteristics produced by thermal decomposition of acetylene and diesel were analyzed, which are formed at different temperatures. These fuels were observed to produce particulate matters, and collected soot samples were observed by using TEM & SEM. These were found to be significantly different in structure and crystallinity.

Decomposition of Harmful Materials by SPCP Discharge (연변방전에 의한 유해물질의 분해제거)

  • 우인성;황명환
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.11 no.11
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    • pp.1043-1048
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    • 1998
  • The decomposition performance of the Surface induced Plasma Chemical Processing(SPCP) for benzene, toluene, xylene and $NO_2$ were experimentally examined. Discharge exciting frequency range was 5kHz and 10kHz, and low frequency discharge requires high voltage to inject high electric power in gas and to decompose contaminants. The decomposition rate of dioxide nitrogen for 5kHz power in gas and to decompose contaminants. The decomposition rate of dioxide nitrogen for 5kHz power supply is only 85%, but it’s rate for 10kHz power supply is very high, more than 96% when peak voltage is 12kv. Aromatic hydrocarbon vapor of up to 1000ppm is almost throughly decomposed at the flow rate of 1000$\ell$/min or lower rate under the discharge with electric power of several hundred watts. High decomposition rate is shown in every case, that is, for SPCP reactor is necessary to obtain the decomposition rate of more than 80~98%. The decomposition rate of benzene, toluene and xylene were 90~98% and dioxide nitrogen was 45~96%.

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Properties of CB/SBR Rubber Composites Filled by Carbon Blacks Used as Catalysts for Hydrogen Production through Hydrocarbon Decomposition

  • Dai, Shuangye;Ao, Gyeou;Kim, Myung-Soo
    • 한국신재생에너지학회:학술대회논문집
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    • pp.392-395
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    • 2006
  • In this work, the reinforcing action of carbon blacks in rubber was investigated by SEM and UTM measurements which at low a testing of the surface and mechanical properties. In order to gain an insight into the different properties between carbon blacks before and after methane/propane decomposition, various composites were prepared with SBR synthetic rubber and different carbon blacks with four loading ratios. The results were analyzed with the aim of finding suitable conditions for decomposition reaction to cut down the net cost for hydrogen production through hydrocarbon decomposition.

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Combustion and thermal decomposition characteristics of brown coal and biomass

  • Kim, Hee Joon;Kasadani, Yuichi;Li, Liuyun;Shimizu, Tadaaki;Kim, Lae-Hyun
    • Journal of Energy Engineering
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    • v.21 no.4
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    • pp.373-377
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    • 2012
  • Among the fossil fuels, the brown coal is a great deal of resources. However, it is hardly used due to the high moisture content and low calorific value. It has both the week points such as spontaneous combustion and high volatile content and the strong points such as the low-sulfur and low ash content. If we overcome these week points, the using amount of brown coal would be increased. Also, it is well known that biomass is one of the important primary renewable energy sources because of carbon neutral energy. Furthermore, the utilization of biomass has been more and more concerned with the depletion of fossil fuel sources as well as the global warming issues. Combustion and thermal decomposition of biomass is one of the more promising techniques among all alternatives proposed for the production of energy from biomass. In this study, combustion of brown coals and mushroom waste was done. Mass change of samples and emission of hydrocarbon components were measured. As the results, we obtained combustion rate constant. Also activation energy was calculated in char combustion step. Hydrocarbon components were more generated in low oxygen concentration than high. Emission amount of hydrocarbon components in mushroom waste was significantly increased comparing to brown coal.

Numerical Study of the Effects of Hydrocarbon Addition and Corresponding Chemical Kinetics on the Promotion of NO Oxidation in Nonthermal Plasma DeNOx Treatment (비열 플라즈마에 의한 NO의 산화에서의 탄화수소 첨가 효과와 그 반응역학에 대한 수치적 연구)

  • Shin, Hyun-Ho;Yoon, Woong-Sup
    • Journal of the Korean Society of Combustion
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    • v.5 no.2
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    • pp.37-50
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    • 2000
  • In the present study, a systematic chemical kinetic calculations were made to investigate the augmentation of $NO-NO_2$ conversion due to the addition of various hydrocarbons (methane, ethylene, ethane, propylene, propane) in the nonthermal plasma treatment. It is included in the present conclusion that the reaction between hydrocarbon and oxygen radicals induced by electron collision, is believed to be a primarily process for triggering the overall NO oxidation and the eventual NOx reduction. Upon the completion of the initiating step, various radicals (OH, $HO_2$ etc.) successively are produced by hydrocarbon decomposition form the primary path of $NO-NO_2$ conversion. When the initiating step is not activated, hydrocarbon consumption rate appeared to be very low, thereby the targeted level of NO conversion can only be achieved by the addition of more input energy. Present study showed ethylene and propylene to have higher affinity with O radical under all conditions, thereby both of these hydrocarbons show very fast and efficient $NO-NO_2$ oxidation. It was also shown that propylene is superior to ethylene in the aspect of NOx removal.

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Technical Analysis of Thermal Decomposition Characteristics of Liquid Hydrocarbon Fuels for a Regenerative Cooling System of Hypersonic Vehicles

  • Lee, Hyung Ju
    • Journal of Aerospace System Engineering
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    • v.14 no.4
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    • pp.32-39
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    • 2020
  • A technological review and analysis were performed on thermal cracking of aviation hydrocarbon fuels that circulate as coolants in regenerative cooling systems of hypersonic flights. Liquid hydrocarbons decompose into low-carbon-number hydrocarbons when they absorb a considerable amount of energy at extremely high temperatures, and these thermal cracking behaviors are represented by heat sink capacity, conversion ratio, reaction products, and coking propensity. These parameters are closely interrelated, and thus, they must be considered for optimum performance in terms of the overall heat absorption in the regenerative cooling system and supersonic combustion in the scramjet engine.

A Study of Thermal Stability on Polymers and Sodium Azide Mixture by DSC (DSC에 의한 고분자물과 나트륨아지드 혼합물의 열안정성에 관한 연구)

  • 이내우;박준조
    • Journal of the Korean Society of Safety
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    • v.12 no.2
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    • pp.87-94
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    • 1997
  • If sodium azide is impinged by certain reasons, it will be produced explosives by heavy metals and toxic materials. But it is used propellent for inflating automotive safety bags and the other chemical manufacturing purpose. The investigation of thermal hazard potential of sodium azide itself and with polymers ate very important because some parts of automotives, transporting vessels of reactive chemicals and many any other constituents of structures in factories are made of polymers. The range of decomposition temperatures are about $360-380^{\circ}C$, even if it depends on heating rate and sample weight. Thermal decomposition heat of sodium azide in air is higher than in nitrogen atmosphere, because the former is included oxidizing heats of sodium metal which is made by decomposition of sodium azide to end. Especially decomposition temperature of polymers are increased on the order of bonding energy between atoms in hydrocarbon moleculars.

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Effect of Hydrocarbons on the Promotion of $NO-NO_{2}$ Conversion in NonThermal Plasma DeNOx Treatment (비열 플라즈마에 의한 NO의 산화에 탄화수소 첨가제가 미치는 영향)

  • Shin, Hyun-Ho;Yoon, Woong-Sup
    • 한국연소학회:학술대회논문집
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    • pp.178-188
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    • 2000
  • In the present study, a systematic chemical kinetic calculations were made to investigate the augmentation of $NO-NO_{2}$ conversion due to the addition of various hydrocarbons (methane, ethylene, ethane, propene, propane) in the nonthermal plasma treatment. It is included in the present conclusion that the reaction between hydrocarbon and oxygen radicals induced by electron collision, is believed to be a primarily process for triggering the overall NO oxidation and the eventual NOx reduction. Upon the completion of the initiating step, various radicals (OH, $HO_{2}$ etc.) successively produced by hydrocarbon decomposition form the primary path of $NO-NO_{2}$ conversion. When the initiating step is not activated, hydrocarbon consumption rate appeared to be very low, thereby the targeted level of NO conversion can only be achieved by the addition of more input energy. Present study showed ethylene and propene to have higher affinity with 0 radical under all conditions, thereby both of these hydrocarbons show very fast and efficient $NO-NO_{2}$ oxidation. It was also shown that propene is superior to ethylene in the aspect of NOx removal.

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Effect of Hydrocarbons on the Promotion of NO-$NO_2$ Conversion in NonThermal Plasma DeNOx Treatment (비열 플라즈마에 의한 NO의 산화에 탄화수소 첨가제가 미치는 영향)

  • Shin, Hyun-Ho;Yoon, Woong-Sup
    • 한국연소학회:학술대회논문집
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    • pp.33-46
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    • 2000
  • In the present study, a systematic chemical kinetic calculations were made to investigate the augmentation of NO-$NO_2$ conversion due to the addition of various hydrocarbons (methane, ethylene, ethane, propene, propane) in the nonthermal plasma treatment. It is included in the present conclusion that the reaction between hydrocarbon and oxygen radicals induced by electron collision, is believed to be a primarily process for triggering the overall NO oxidation and the eventual NOx reduction. Upon the completion of the initiating step, various radicals (OH, $NO_2$ etc.) successively produced by hydrocarbon decomposition form the primary path of NO-$NO_2$ conversion. When the initiating step is not activated, hydrocarbon consumption rate appeared to be very low, thereby the targeted level of NO conversion can only be achieved by the addition of more input energy. Present study showed ethylene and propene to have higher affinity with 0 radical under all conditions, thereby both of these hydrocarbons show very fast and efficient NO-$NO_2$ oxidation. It was also shown that propene is superior to ethylene in the aspect of NOx removal.

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