• Title, Summary, Keyword: synthesis gas

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A simulation study on synthesis gas process optimization for GTL (Gas-to-Liquid) pilot plant (GTL 합성유 제조용 파일럿 플랜트 최적 운전 변수 도출을 위한 합성가스 공정 시뮬레이션 연구)

  • Kim, Yong Heon;Bae, Ji Han;Park, Myoung Ho
    • 한국신재생에너지학회:학술대회논문집
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    • pp.74.2-74.2
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    • 2011
  • A simulation study on synthesis gas process in GTL process was carried out in order to find optimum operation conditions for GTL (gas-to-liquid) pilot plant design. Optimum operating conditions for synthesis gas process were determined by changing reaction variables such as feed temperature and pressure. During the simulation, overall synthesis process was assumed to proceed under steady-state conditions. It was also assumed that physical properties of reaction medium were governed by RKS (Redlich-Kwong-Soave) equation. The effect of temperature and pressure on synthesis gas process $H_2$/CO ratio were mainly examined. Simulation results were also compared to experimental results to confirm the reliability of simulation model. Simulation results were reasonably well matched with experimental results.

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Carbon Nanotube Synthesis with High Purity by Introducing of NH3 Etching Gas (암모니아 식각 가스 도입에 의한 고순도 탄소나노튜브의 합성)

  • Lee, Sunwoo;Lee, Boong-Joo
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.6
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    • pp.782-785
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    • 2013
  • Multi-walled carbon nanotubes were synthesized on Ni catalyst using thermal chemical vapor deposition. By introducing ammonia gas during the CNT synthesis process, clean and vertically aligned CNTs without impurities could be prepared. As the ammonia gas increased a partial pressure of hydrogen in the mixed gas during the CNT synthesis process, we could control the CNT synthesis rate appropriately. As the ammonia gas has an etching ability, amorphous carbon species covering the catalyst particles were effectively removed. Therefore catalyst particles could maintain their catalytic state actively during the synthesis process. Finally, we could obtain clean and vertically aligned CNTs by introducing $NH_3$ gas during the CNT synthesis process.

A simulation study on synthesis gas process optimization for FT(Fischer-Tropsh) synthesis (FT(Fischer-Tropsh) 합성유 제조를 위한 합성가스 공정 최적화 연구)

  • Kim, Yong-Heon;Lee, Won-Su;Lee, Heoung-Yeoun;Koo, Kee-Young;Song, In-Kyu
    • 한국신재생에너지학회:학술대회논문집
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    • pp.888-888
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    • 2009
  • A simulation study on SCR (Steam Carbon dioxide Reforming) process in gas-to-liquid (natural gas to Fischer-Tropsch synthetic fuel) process was carried out in order to find optimum reaction conditions for GTL (gas-to-liquid) process reaction. Optimum SCR operating conditions for synthesis gas to FT (Fischer-Tropsch) process were determined by changing reaction variables such as feed temperature and pressure. During the simulation, overall synthesis process was assumed to proceed under steady-state conditions. It was also assumed that physical properties of reaction medium were governed by RKS (Redlich-Kwong-Soave) equation. SCR process was considered as reaction models for synthesis gas in GTL proess. The effect of temperature and pressure on SCR process $H_2$/CO ratio and the effect of reaction pressure on SCR reaction were mainly examined. Simulation results were also compared to experimental results to confirm the reliability of simulation model. Simulation results were reasonably well matched with experimental results.

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GTL(Gas-to-Liquid) 기술 현황

  • Jun, Gi-Won
    • Journal of Energy Engineering
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    • v.16 no.2
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    • pp.58-63
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    • 2007
  • In recent years, the technologies for the production of synthetic fuel from natural gas have been attracting considerable interest because of high oil prices. While oil prices remaining high, GTL (Gas-to-Liquids) technology would provide an attractive option for utilizing gas resources. Furthermore, GTL fuels contain almost zero sulfur and low aromatics and have a very high cetane so that they are estimated to be environmentally friendly diesel fuels able of meeting the advanced fuel specifications of the 21st century. GTL process generally consists of three primary steps: synthesis gas production from natural gas reforming, hydrocarbon production from synthesis gas by Fischer-Tropsch (F-T) synthesis, product upgrading by hydrocracking/hydroisomerization. This paper presents a brief summary of GTL technology and worldwide development trend about it focusing on the reforming of natural gas and the F-T synthesis.

Combustion Characteristics of Synthesis Gas Generated in Waste Pyrolysis Process (폐기물 열분해과정에서 발생된 합성가스의 연소 특성)

  • Ahn, Yong-Soo;Hwang, Sang-Soon;Lee, Sung-Ho;Lee, Hyup-Hee
    • 한국연소학회:학술대회논문집
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    • pp.143-150
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    • 2003
  • The synthesis gas generated in waste pyrolysis melting process which consists of pyrolysis of waste and melting process of ash is known to be an alternative fuel. Since the compositopn of synthesis gas is much different from other synthesis gases, the fundamental combustion characteristics are analyzed in this study. The radiation heat heat flux is used to estimate the heat flux from flames made by many combinations of fuel and oxidant supply. The results show that the synthesis gas needs much more amount of oxidant for equivalent heat flux to methane flame and the inverse diffusion flame type for synthesis gas burner is suitable for better radiation heat transfer.

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Kinetics on Direct Synthesis Dimethyl Ether (디메틸에테르의 직접반응 속도론)

  • Cho Wonihl;Choi Chang Woo;Baek YoungSoon;Row Kyung Ho
    • 한국가스학회:학술대회논문집
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    • pp.83-87
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    • 2005
  • The kinetics of the direct synthesis of DME was studied under different conditions over a temperature range of $220\~280^{\circ}C$, syngas ratio $1.2\~ 3.0$ All experiment were carried out over hybrid catalyst, composed to a methanol synthesis catalyst (Cu/ZnO/$Al_2O_3$) and a dehydration Catalyst ($\gamma$-Al_2O_3$) The observed reaction rate qualitatively follows a Langmiur-Hinshellwood type of reaction mechanism. Such a mechanism is considered with three reaction, methanol synthesis, methanol dehydration and water gas shift reaction. From a surface reaction with dissociative adsorption of hydrogen, methanol and water, individual reaction rate was determined

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Operation Characteristics of Gasification/Melting Pilot Plants for Synthesis Gas Production using Coal and Waste (석탄 및 폐기물로부터 합성가스 제조를 위한 가스화용융 Pilot Plant 운전특성)

  • Chung, Seok-Woo;Yun, Yong-Seung;Yoo, Young-Don
    • 한국신재생에너지학회:학술대회논문집
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    • pp.561-564
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    • 2005
  • Gasification has been regarded as a very important technology to decrease environmental pollution and to obtain higher efficiency. The gasification process converts carbon containing feedstock into a synthesis gas, composed primarily of CO and $H_2$. And the synthesis gas can be used as a source for power generation or chemical material production. Through more than nine years, IAE developed and upgraded several gasification/melting pilot plant system, and obtained a good quality synthesis gas. This paper illustrates the gasification characteristics and operation results of two 3 ton/day synthesis gas production facilities. One is entrained-bed slagging type coal gasifier system which is normally operated in the temperature range of $1,400\~1,450^{\circ}C,\;8\~10$ bar pressure. And the other is fixed-bed type gasification/melting furnace system using MSW and industrial wastes as a feedstock.

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A dynamic simulation study on SCR (Stream Carbon dioxide Reforming) process for pilot plant operation (파일럿 플랜트 최적운전을 위한 SCR공정 동적 모사)

  • Kim, Yong Heon;Bae, Ji Han;Park, Myoung Ho
    • 한국신재생에너지학회:학술대회논문집
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    • pp.136.2-136.2
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    • 2011
  • A dynamic simulation study on SCR process in GTL process was carried out in order to find optimum operation conditions for pilot plant operation. Optimum operating conditions for SCR synthesis gas process were determined by changing operation variables such as feed temperature and pressure. It was also assumed that physical properties of reaction medium were governed by RKS (Redlich-Kwong-Soave) equation. The effect of temperature and pressure on synthesis gas process $H_2$/CO ratio were mainly examined. Dynamic simulation results were fed back to feed operation condition for optimizing productivity, especially for appropriate condition to FT (Fischer-Tropsch) synthesis unit.

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A Study on Thermodynamic Efficiency for HTSE Hydrogen and Synthesis Gas Production System using Nuclear Plant (원자력 이용 고체산화물 고온전기분해 수소 및 합성가스 생산시스템의 열역학적 효율 분석 연구)

  • Yoon, Duk-Joo;Koh, Jae-Hwa
    • Transactions of the Korean hydrogen and new energy society
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    • v.20 no.5
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    • pp.416-423
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    • 2009
  • High-temperature steam electrolysis (HTSE) using solid oxide cell is a challenging method for highly efficient large-scale hydrogen production as a reversible process of solid oxide fuel cell (SOFC). The overall efficiency of the HTSE hydrogen and synthesis gas production system was analyzed thermo-electrochemically. A thermo-electrochemical model for the hydrogen and synthesis gas production system with solid oxide electrolysis cell (SOEC) and very high temperature gas-cooled reactor (VHTR) was established. Sensitivity analyses with regard to the system were performed to investigate the quantitative effects of key parameters on the overall efficiency of the production system. The overall efficiency with SOEC and VHTR was expected to reach a maximum of 58% for the hydrogen production system and to 62% for synthesis gas production system by improving electrical efficiency, steam utilization rate, waste heat recovery rate, electrolysis efficiency, and thermal efficiency. Therefore, overall efficiency of the synthesis production system has higher efficiency than that of the hydrogen production system.