• Title, Summary, Keyword: gasification fuel

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Premixed Combustion Characteristics of Coal Gasification Fuel in Constant Volume Combustion Chamber (석탄가스화 연료의 정적 예혼합 연소특성)

  • Kim Tae-Kwon;Jang Jun-Young
    • Journal of Environmental Science International
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    • v.15 no.6
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    • pp.601-606
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    • 2006
  • The coal gasification fuel is important to replace petroleum fuel. Also they have many benefits for reducing the air pollution. Measurements on the combustion characteristics of synthetic gas from coal gasification have been conducted as compared with LPG in constant volume combustion chamber. The fuel is low caloric synthetic gas containing carbon monoxide 30%, hydrogen 20%, carbon dioxide 5%, and nitrogen 45%. To elucidate the combustion characteristics of the coal gasification fuel, the combustion pressures, combustion durations, and pollutants(NOx, $CO_2$, CO) are measured with equivalence ratios($\phi$), and initial pressures of fuel-air mixture in constant volume chamber. In the case of the coal gasification fuel, maximum combustion pressure and NOx concentration are lower rather than LPG fuel. However CO and $CO_2$ emission concentration are similar to that of LPG fuel.

Comparative Evaluation of Steam Gasification Reactivity of Indonesian Low Rank Coals (인도네시아 저등급 석탄의 스팀 가스화 반응성 비교 평가)

  • KIM, SOOHYUN;VICTOR, PAUL;YOO, JIHO;LEE, SIHYUN;RHIM, YOUNGJOON;LIM, JEONGHWAN;KIM, SANGDO;CHUN, DONGHYUK;CHOI, HOKYUNG
    • Transactions of the Korean hydrogen and new energy society
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    • v.27 no.6
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    • pp.693-701
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    • 2016
  • Steam gasification of low rank coals is possible at relatively low temperature and low pressure, and thus shows higher efficiency compared to high rank coals. In this study, the gasification reactivity of four different Indonesian low rank coals (Samhwa, Eco, Roto, Kideco-L) was evaluated in $T=700-800^{\circ}C$. The low rank coals containing $53.8{\pm}3.4$ wt% volatile matter in proximate analysis and $71.6{\pm}1.2$ wt% carbon in ultimate analysis showed comparable gasification reactivity. In addition, $K_2CO_3$ catalyst rapidly accelerated the reaction rate at $700^{\circ}C$, and all of the coals were converted over 90% within 1 hour. The XRD analysis showed no significant difference in carbonization between the coals, and the FT-IR spectrum showed similar functional groups except for differences due to moisture and minerals. TGA results in pyrolysis ($N_2$) and $CO_2$ gasification atmosphere showed very similar behavior up to $800^{\circ}C$ regardless of the coal species, which is consistent with the steam gasification results. This confirms that the indirect evaluation of the reactivity can be made by the above instrumental analyses.

Effects of Biomass Fuel Conditions on Biomass Ossification (바이오매스 가스화장치를 이용한 합성가스 생산에 있어서 연료조건의 영향)

  • Hong, Seong-Gu
    • Journal of The Korean Society of Agricultural Engineers
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    • v.48 no.3
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    • pp.63-71
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    • 2006
  • A downdraft gasifier was made of stainless steel for biomass gasification. Internal reactor had a 300 mm diameter and 8 air intakes. Three thermocouples were installed to measure the temperature inside the reactor. Three different biomass fuels were provided in the experiments to find out the effects of fuel conditions on gasification processes; charcoals, woodchips, and mixture of woodchip and charcoals. Two different experiments were conducted fer charcoal experiments, small and larger sizes of charcoal fuels. It took about 10 minutes after ignition to generate combustible producer gas when charcoal was f9d, but 20 or more minutes for woodchips. When the gasification was stabilized, the highest temperature was observed just below the combustion zone. The air flow rate for woodchip experiment was provided at 25% of a stoichiometric requirement of combustion, which was within the range of typical air flow rate fer woody biomass gasification. Carbon monoxide concentrations were also within the values reported in the previous studies, ranging 20 to 30% depending on fuel types. It could be seen that fuel size and heating value were very important parameters in biomass gasification. These parameters should be taken into account in operating and designing biomass gasifiers.

The study on kinetic value for simulation in fluidized catalytic gasification (유동층에서의 촉매 석탄가스화 공정 모델 모사를 위한 kinetics에 대한 연구)

  • Jang, Dong-Ha;Jeon, Young-Shin;Kim, Hyung-Taek
    • 한국신재생에너지학회:학술대회논문집
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    • pp.74.1-74.1
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    • 2011
  • As a demand for energy, many studies are increasing about energy resource. One of these resources is coal which reserves of underground. A lot of research to use coal is going on as method of IGCC (Integrated Gasification Combined Cycle). In addition, SNG(Substitute Natural Gas) and IGFC (Integrated Gasification Fuel Cell) are also being developed for fuel & electricity. This technology which uses synthesis gas after gasification is to produce electricity from the Fuel Cell. At this point, important thing is the components of synthesis gas. The main objective is to increase the proportion of methane and hydrogen in synthesis gas. The catalytic gasification is suitable to enhance the composition of methane and hydrogen. In this study, Exxon Predevelopment catalyst gasification study was served as a good reference and then catalytic gasification simulation process is conducting using Aspen Plus in this research. For this modelling, kinetic value should be calculated from Exxon's report which is used for modeling catalytic gasification. Catalytic gasification model was performed by following above method and was analyzed by thermodynamic method through simulation results.

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An Equilibrium Analysis to Generate Syngas in the Pyrolysis and Gasification of Refuse Plastic Fuel (RPF 열분해 가스화시 합성가스에 대한 화학평형 계산)

  • Kang, Pil-Sun;Bae, Su-Woo;Song, Soon-Ho;Hwang, Jung-Ho
    • Proceedings of the KSME Conference
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    • pp.3435-3439
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    • 2007
  • The aim of this study is to find out the condition that generates maximum $H_2$ through the calculation of equilibrium model with conditions of pyrolysis gases of Refuse Plastic Fuel(RPF). This study deals with the computational simulation of a RPF gasification using an equilibrium model based on minimization of the Gibbs free energy. An equilibrium analysis was carried out to determine species composition of Syngas in RPF gasification and reactions to variation of temperature, $O_2$/Fuel ratio and Steam/Fuel ratio. Calculated results showed that $O_2$/Fuel ratio, Steam/Fuel ratio and temperature affected on mole fraction of $H_2$, CO.

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Reduction of Nitrogen Oxide by Fuel Staged Technology on the Combustion of Gasification Fuel (가스화 연료 연소시 단계적 연료주입 기술에 의한 질소산화물 저감)

  • Chae, Jong-Seong;Jo, Seon-Hui;Jeon, Yeong-Nam
    • Journal of Korean Society for Atmospheric Environment
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    • v.14 no.2
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    • pp.107-116
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    • 1998
  • Coal gasification fuel has generally a lower calorific values than natural gas and also contains ammonia which is a main source of fuel NOx. Such a fuel is in need of the advanced technologies for the NOx reduction with higher combustion efficiency. Therefore fuel staged combustion was investigated for the fuel NOx control using a bench scale gas combustoi for the fuel NOx control. Parametric screening studies were performed with the variation of air ratio, retention length and reburning fuel. The NOx reduction efficiency was increased with an increase of total air ratio having optimum reburning air ratio differently, The Increased retention length of the reburning zone was preferable for NOx reduction. Hydrocarbonic reburning fuels like propane and butane were more effective for the NOx reduction efficiency than hydrogen fuel. The NOx concentration at exit was linearly increased according to the fuel-N the fuel.

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Applicability to Engine Fuel of Low Caloric Synthetic Gas from Coal Gasification (석탄가스화기기로부터 발생된 저발열량 합성가스의 엔진연료 적용 연구)

  • 장준영;김태권;유영돈;윤용승
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
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    • pp.595-600
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    • 2003
  • This paper presents the applicability of low caloric synthetic gas from coal gasification to a gas engine system. A commercial LPG engine is modified to use the low caloric synthetic gas from coal gasification as the gas engine fuel. The modification is focused on the fuel supplying system, which includes air flowrate adjusting orifice, gas mixer, vaporizer, preheater, regulators, and fuel tank. The electrical system and others for the alternative fuel are also redesigned and replaced. From the results of engine performance data, we have demonstrated that the engine modified by using coal gasification gas is well operated from idle to wide open throttle conditions although the engine power is somewhat reduced relative to LPG fueled engine. This paper addresses the need to determine the practical potential for such a concept and to identify further research and development efforts that may be necessary.

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Effect of Partial Oxidation of Wood and RDF in a Fluidized Bed (유동상 반응로 조건에서 목재와 RDF 부분가스화의 영향)

  • Kim, Tae-Hyun;Choi, Sang-Min
    • 한국연소학회:학술대회논문집
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    • pp.161-167
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    • 2007
  • Gasification characteristics in the fluidized bed reactor are essential for the design of a gasification furnace to optimize the operation condition. Moisture content of the solid fuel is one of the important factors to influence directly the gasification characteristics. So it is necessary to investigate the effect of moisture content of solid fuel in gasification process. Gasification characteristics are investigated with results from thermogravimetric analyser and lab-scale fluidized bed reactor for wood and RDF samples along with changing moisture contents. Additionally lab-scale fluidized bed reactor was run continuously and gas concentrations at the exit were measured. It is observed that the rate of reaction in partial oxidation condition is in between the results from the combustion environment and from the inert condition. Moisture content in a particle slows down the heating rate of a particle. So, reaction time is delayed by the moisture content. However, RDF samples that are easy to break-up doesn't show the effect of moisture content. The results of continuous operation condition shows that proper moisture content promotes gasification because steam from the particles helps gasifcation of the sold fuel.

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Effect of Partial Oxidation of Wood and RDF in a Fluidized Bed (유동상 반응로 조건에서 목재와 RDF 부분 산화의 영향)

  • Kim, Tae-Hyun;Choi, Sang-Min
    • Journal of the Korean Society of Combustion
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    • v.13 no.2
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    • pp.23-32
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    • 2008
  • Gasification characteristics in the fluidized bed reactor are essential for the design of a gasification furnace to optimize the operation condition. Moisture content of the solid fuel is one of the important factors to influence directly the gasification characteristics. So it is necessary to investigate the effect of moisture content of solid fuel in partial oxidation condition. Gasification characteristics are investigated with results from thermogravimetric analyzer and lab-scale fluidized bed reactor for wood and RDF samples along with changing moisture contents. Additionally lab-scale fluidized bed reactor was run continuously and gas concentrations at the exit were measured. It is observed that the rate of reaction in partial oxidation condition is between the results from the combustion environment and from the inert condition. Moisture content in a particle slows down the heating rate of a particle. So, reaction is delayed by the moisture content. However, RDF samples those are easy to break-up don't show the effect of moisture content. The result of continuous operation condition shows that proper moisture content promotes gasification because steam from the particles helps gasification of the solid fuel. A simulation to predict the syn-gas composition was conducted by the Aspen Plus process simulator. The cold gas efficiency of the experiment was compared with results from the simulation.

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An Equilibrium Analysis to Generate Syngas in the Pyrolysis and Gasification of Refuse Plastic Fuel (RPF 열분해 가스화시 합성가스 조성에 대한 화학평형 계산)

  • Kang, Pil-Sun;Bae, Su-Woo;Song, Soon-Ho;Hwang, Jung-Ho
    • Journal of the Korean Society of Combustion
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    • v.12 no.4
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    • pp.57-61
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    • 2007
  • The aim of this study is to find out the condition that generates maximum $H_2$ through the calculation of equilibrium model with conditions of pyrolysis gases of Refuse Plastic Fuel(RPF). This study deals with the computational simulation of a RPF gasification using an equilibrium model based on minimization of the Gibbs free energy. An equilibrium analysis was carried out to determine species composition of Syngas in RPF gasification and reactions to variation of temperature, $O_2/Fuel$ ratio and Steam/Fuel ratio. Calculated results shows that hydrocarbons in pyrolyzed gas are converted to synthesis gas which is formed on hydrogen and carbon monoxide.

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