• Title, Summary, Keyword: syngas

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GASIFICATION OF CARBONEOUS WASTES USING THE HIGH TEMPERATURE REFORMER

  • Lee, Dong-Jin
    • Environmental Engineering Research
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    • v.10 no.3
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    • pp.122-130
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    • 2005
  • Gasification of carbonaceous wastes such as shredded tire, waste lubricating oil, plastics, and powdered coal initiates a single-stage reforming reactor(reformer) Without catalyst and a syngas burner. Syngas is combusted with $O_2$ gas in the syngas burner to produce $H_2O\;{and}\;CO_2$ gas with exothermic heat. Reaction products are introduced into the reforming reactor, reaction heat from syngas burner elevates the temperature of reactor above $1,200^{\circ}C$, and hydrogen gas fraction reaches 65% of the product gas output. Reactants and heat necessary for the reaction are provided through the syngas burner only. Neither $O_2$ gas nor steam is injected into the reforming reactor. Multiple syngas burners may be connected to the reforming reactor in order to increase the syngas output, and the product syngas is recycled into syngas burner.

Numerical simulations on flow and particle behaviors in the upper part of a syngas cooler for IGCC (IGCC 합성가스 냉각기 상부의 열유동 및 입자거동 특성에 대한 전산해석 연구)

  • Park, Sangbin;Ye, Insoo;Ryu, Changkook;Kim, Bongkeun
    • 한국연소학회:학술대회논문집
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    • pp.147-148
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    • 2012
  • The syngas produced from coal gasification is cooled down for gas cleaning by a syngas cooler that produces steam. Due to the presence of fly slag in the syngas, erosion, slagging and corrosion especially in the upper part of the syngas cooler may cause major operational problems. This study investigates the flow, heat transfer and particle behaviors in the syngas cooler of a 300MWe IGCC plant by using computational fluid dynamics. For various operational loads and geometry, the gas and particle flows directly impinged on the wall opposite to the syngas inlet, which may lead to erosion of the membrane wall. In the evaporate channels inside the syngas cololr, the particle flows were concentrated more on the outer channel where slagging becomes more serious. The heat transfer to the wall was mainly by convection which was larger on the side wall below the inlet level.

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A Study on Syngas Co-Combustion Characteristics in a 0.7 MWth Water-Tube Boiler with Single Heavy Oil Burner (중유 싱글 버너 수관식 보일러에서의 합성가스 혼합연소 특성 연구)

  • Choi, Sin-Yeong;Yang, Dong-Jin;Bang, Byoung-Yeol;Yang, Won
    • Transactions of the Korean hydrogen and new energy society
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    • v.21 no.5
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    • pp.452-459
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    • 2010
  • This study is aimed to investigate changes of combustion characteristics and heat efficiency when syngas from gasification process using low-rank fuel such as waste and/or biomass is applied partially to an industrial boiler. An experimental study on syngas co-combustion was performed in a 0.7 MW (1 ton steam/hr) water tube boiler using heavy oil as a main fuel. Three kinds of syngas were used as an alternative fuel: mixture gas of pure carbon monoxide and hydrogen, syngas of low calorific value generated from an air-blown gasification process, and syngas of high calorific value produced from an oxygen-blown gasification process. Effects of co-combustion ratio (0~20%) for each syngas on flue gas composition were investigated through syngas injection through the nozzles installed in the side wall of the boiler and measuring $O_2$, $CO_2$, CO and NOx concentrations in the flue gas. When syngas co-combustion was applied, injected syngas was observed to be burned completely and NOx concentration was decreased because nitrogen-containing-heavy oil was partially replaced by the syngas. However, heat efficiency of the boiler was observed to be decreased due to inert compounds in the syngas and the more significant decrease was found when syngas of lower calorific value was used. However, the decrease of the efficiency was under 10% of the heat replacement by syngas.

A Personal Reformer(PR) for your Fuel cell system (연료전지를 위한 개인용 개질기)

  • Kim Hyeon Yeong
    • 한국전기화학회:학술대회논문집
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    • pp.103-108
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    • 2004
  • The present paper relates to an apparatus in which all carbonaceous material such as coal, oil, plastics and any substance having carbon atoms as part of its constituents are reformed(gasified) into syngas at temperature above $1,200^{\circ}C$(KR patent No.0391121, and PCT/KR2001/01717 and PCT/KR2004/001020). It comprises a single-stage reforming reactor without catalyst and a syngas burner as shown in Fig.2. syngas is combusted with $O_2$ gas in the syngas bunter to produce $M_2O$ and $CO_2$ gas with exothermic heat. Reaction products are introduced into the reforming reactor, reaction heat from syngas burner elevate the temperature of reactor above $1,200^{\circ}C$, and reaction products reduce carbonaceous material down to CO and $H_2$ gases. Reactants and heat necessary for the reaction are provided through the syngas burner only, Neither $O_2$ gas nor steam are injected into the reforming reactor. Reformer is made of ceramic inner lining and sst outer casing. Multiple syngas burners may be connected to the reforming reactor in order to increase the syngas output, and a portion of the product syngas is recycled into syngas burner. The present reformer as shown in Fig.2 is suitable to gasify carbonaceous wastes without secondary pollutants formed from oxidation. Further, it can be miniaturized to accompany a fuel cell system as shown in Fig.3 The output syngas may be used to drive a fuel cell and a portion of electrical power generated in a fuel cell is used to heat a compact reformer up to $1,200^{\circ}C$ so that gas/liquid fossil fuel can efficiently reformed into syngas. The fuel cell serves as syngas burner in Fig.2. The reformation reaction is sustained through recycling a portion of product syngas into a fuel cell and using a portion of electric power generated to heat the reformer for continuous operation. Such reforming reactor may be miniaturized into a size of PC, then you have a Personal Reformer(PR).

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Numerical Analysis for the Detailed Structure of Syngas Turbulent Nonpremixed Flames (석탄가스 난류비예혼합 화염장의 해석)

  • Lee, Jeong-Won;Kim, Chang-Hwan;Kim, Yong-Mo
    • 한국신재생에너지학회:학술대회논문집
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    • pp.775-778
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    • 2007
  • The present study numerically investigate the detailed structure of the syngas diffusion flames. In order to realistically represent the turbulence-chemistry interaction, the transient flamelet model has been applied to simulate the combustion processes and $NO_X$ formation in the syngas turbulent nonpremixed flames. The single mixture fraction formulation is extended to account for the effects of the secondary inlet mixture. Computations are the wide range of syngas compositions and oxidizer dilutions. Based on numerical results, the detailed discussion has been made for the effects of syngas composition and oxidizer dilution on the structure of the syngas-air and syngas-oxygen turbulent nonpremixed flames.

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A Study on the Improvements of Idle Performance for a SI Engine with a Syngas Assist (합성가스를 이용한 SI엔진의 아이들 성능 개선에 관한 연구)

  • Kim, Chang-Gi;Song, Chun-Sub;Cho, Young-Seok;Kang, Kern-Young
    • Journal of the Korean Society of Combustion
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    • v.11 no.4
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    • pp.14-21
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    • 2006
  • In this study, syngas which is reformed from fossil fuel and has hydrogen as a major component, was added to a gasoline engine to improve combustion stability and exhaust emissions of idle state. Syngas fraction of the total supplied fuel varied to 0 %, 25 %, 50 % with various ignition timing and excess air ratio. Combustion stability, exhaust emissions, fuel consumption and exhaust gas temperature were measured to investigate the effects of syngas addition on idle performance. Results showed that syngas has ability to widely extend lean operation limit and ignition retard range with dramatical reduction of engine out emissions. It is supposed that the usage of syngas in the internal combustion engine is an effective solution to meet the future strict emission regulations.

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Numerical Study on Structure and Pollutant Formation for Syngas Turbulent Nonpremixed Swirling Flames (석탄가스 선회난류 비예혼합 화염장의 화염구조 및 NOx 배출특성 해석)

  • Lee, Jeong-Won;Kang, Sung-Mo;Kim, Yong-Mo;Joo, Yong-Jin
    • Journal of the Korean Society of Combustion
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    • v.14 no.2
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    • pp.10-17
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    • 2009
  • The present study numerically investigate the effects of the Syngas chemical kinetics on the basic flame properties and the structure of the Syngas nonpremixed flames. In order to realistically represent the turbulencechemistry interaction and the spatial inhomogeneity of scalar dissipation rate, the Eulerian Particle Flamelet Model (EPFM) with multiple flamelets has been applied to simulate the combustion processes and NOx formation in the syngas turbulent nonpremixed flames. Validation cases include the Syngas turbulent nonpremixed jet and swirling flames. Based on numerical results, the detailed discussion has been made for the effects of the chemical kinetics, the flame structure, and NOx formation characteristics in the turbulent Syngas nonpremixed flames.

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Operation Characteristics of Coal Syngas Production and DME Conversion Facilities (석탄 합성가스 제조 및 화학원료(DME) 전환설비의 운전 특성)

  • Chung, Seok-Woo;Kim, Mun-Hyun;Lee, Seung-Jong;Yun, Yong-Seung
    • 한국신재생에너지학회:학술대회논문집
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    • pp.83-86
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    • 2006
  • In this study, the syngas producing facility that consists of pulverized coal feeding/gasification and hot gas clean-up system was tested for Indonesian subbituminous coal. And the DME conversion facilities have been developed and tested for converting syngas to DME by reactions with catalysts. So, the entrained-bed slagging type pi lot scale coal gasifier was operated normally in the temperature range of $1,400{\sim}1,450^{\circ}C,\;7{\sim}8kg/cm^2$ pressure. And Roto middle coal produced syngas that has a composition of $36{\sim}38%$ CO, $14{\sim}16%\;H_2,\;and\;5{\sim}8%\;CO_2$. Particulates in syngas were 99.8% removed by metal filters. $H_2S$ composition in syngas was also desulfurized by the Fe chelate system to yield less than 0.1 ppm level. When the clean syngas $70{\sim}100 Nm^3/h$ was provided to DME conversion rector, normally operated in the temperature range of $230{\sim}250^{\circ}C$ and $60kg/cm^2$ pressure, 4.5% DME was yielded.

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An Experimental Study on the Operation of a Power Generation Engine with Syngas from RPF (폐기물 열분해 합성가스를 이용한 발전용 엔진구동에 대한 실험적 연구)

  • Jeong, Hyo-Jae;Lee, Jeong-Woo;Lee, Jae-Wook;Moon, Ji-Hong;Choi, In-Soo;Park, Sang-Shin;Hwang, Jung-Ho;Yu, Tae-U;Lee, Uen-Do
    • Journal of the Korean Society of Combustion
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    • v.15 no.3
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    • pp.48-56
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    • 2010
  • Performances of power generation engine were investigated with syngas from RPF. A stoker type, multi-staged pyrolysis-gasification system, was employed for syngas generation and the syngas was refined with the sequential cleaning processes composed of a gas cooler, a bag filter and a wet scrubber. 20 kWe commercial syngas power generation engine was adopted to burn the cleaned syngas which is mainly composed of hydrogen, carbon monoxide, carbon dioxide and methane. The performance of the engine was tested with various syngas compositions and the results were compared to LNG case. Electric power output, exhaust gas temperature, and emission characteristics were measured, and the efficiency of engine generation was investigated as a function of load of power generation.

Numerical Study on Flame Structure and Pollutant Formation for Syngas Turbulent Nonpremixed Swirl Burner (석탄가스 선회난류 연소기의 화염구조 및 공해물질 배출특성 해석)

  • Lee, Jeong-Won;Kang, Sung-Mo;Kim, Yong-Mo
    • 한국신재생에너지학회:학술대회논문집
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    • pp.449-452
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    • 2007
  • The present study numerically investigate the effects of the Syngas chemical kinetics on the basic flame properties and the structure of the Syngas diffusion flames. In order to realistically represent the turbulence-chemistry interact ion and the spatial inhomogeneity of scalar dissipation rate. the Eulerian Particle Flamelet Model(EPFM) with multiple flamelets has been applied to simulate the combustion processes and NOx formation in the syngas turbulent nonpremixed flames. Due to the ability for interactively describing the transient behaviors of local flame structures with CFD solver, the EPFM model can effectively account for the detailed mechanisms of NOx format ion including thermal NO path, prompt and nitrous NOx format ion, and reburning process by hydrocarbon radical without any ad-hoc procedure. validation cases include the Syngas turbulent nonpremixed jet and swirling flames. Based on numerical results, the detailed discussion has been made for the sensitivity of the Syngas chemical kinetics as well as the precise structure and NOx formation characteristics of the turbulent Syngas nonpremixed flames.

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