• Title/Summary/Keyword: Gasifier

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PARAMETRIC NUMERICAL STUDY OF THE REACTING FLOW FIELD OF A COAL SLURRY ENTRAINED GASIFIER (분류층 석탄 가스화기 반응 유동장 변수 전산해석 연구)

  • Song, W.Y.;Kim, H.S.;Shin, M.S.;Jang, D.S.;Lee, Jae-Goo
    • Journal of computational fluids engineering
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    • v.19 no.3
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    • pp.44-51
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    • 2014
  • Considering the importance of the detailed resolution of the reacting flow field inside a gasifier, the objective of this study lies on to investigate the effect of important variables to influence on the reacting flow and thereby to clarify the physical feature occurring inside the gasifier using a comprehensive gasifier computer program. Thus, in this study the gasification process of a 1.0 ton/day gasifier are numerically modeled using the Fluent code. And parametric investigation has been made in terms of swirl intensity and aspect ratio of the gasifier. Doing this, special attention is given on the detailed change of the reacting flow field inside a gasifier especially with the change of this kind of design and operation parameters. Based on this study, a number of useful conclusions can be drawn in the view of flow pattern inside gasifier together with the consequence of the gasification process caused by the change of the flow pattern. Especially, swirl effect gives rise to a feature of a central delayed recirculation zone, which is different from the typical strong central recirculation appeared near the inlet nozzle. The delayed feature of central recirculation appearance could be explained by the increased axial momentum due to the substantial amount of the presence of the coal slurry occupying over the entire gasifier in gasification process. Further, the changes of flow pattern are explained in detail with the gasifier aspect ratio. In general, the results obtained are physically acceptable in parametric study.

The Optimal Operation Condition and Estimation Performance for 300MW Demonstration Gasifier (300MW급 실증 가스화기의 최적 운전조건 및 성능 예측)

  • Yoo, Jeong-Seok;Koo, Ja-Hyung;Paek, Min-Su;Lee, Hwang-Jik
    • 한국신재생에너지학회:학술대회논문집
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    • 2008.05a
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    • pp.368-371
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    • 2008
  • The optimal operation condition of gasifier is one of the most important parameters to increase efficiency and reliability in IGCC plant. Also the prediction of the syngas composition and quantity must be predicted to carry out process design of the gasification plant. However, the gasifier process licensor are protective with information on process design and optimal gasifier design conditions. So, the most of process studies in the engineering company for gasification plant have carried out to look for key parameters and optimal design conditions using several prediction methods. In this paper, we present the estimated preliminary optimal operation condition of the 300MW Demonstration Entrain Flow Gasifier using Aspen Plus. The gasifier operation temperature considering slag flow was predicted by FactSage software and Annen Model.

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A Study on Evaluating the Selection of Low Rank Coal Gasifier (저급탄 가스화기 선정 평가 연구)

  • KIM, CHEOLOONG;LIM, HO;KIM, RYANGGYOON;SONG, JUHUN;JEON, CHUNGHWAN
    • Transactions of the Korean hydrogen and new energy society
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    • v.26 no.6
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    • pp.567-580
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    • 2015
  • In order to select an optimum gasifier for specific low rank coal, evaluation elements were studied by analyzing characteristics of low rank coal compared with those of high rank coal and the effects of each gasifier type in accordance with the characteristics. And syngas composition calculation model was made on the basis of thermochemical equilibrium to quantify some of the evaluation elements. And then the suitable gasifier was selected for a kind of Indonesian low rank coal through this syngas composition calculation model and the evaluation elements of selecting gasifier.

Numerical Simulation of the Flow Field inside a New 1 Ton/Day Entrained-Flow Gasifier in KIER

  • Li, Xiang-Yang;Choi, Young-Chan;Park, Tae-Jun
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
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    • 2000.04a
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    • pp.43-50
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    • 2000
  • The flow field of a 1 Ton/Day entrained-flow gasifier constructed in KIER was numerical simulate in this paper. The standard $k-{\varepsilon}$ turbulence model and simple procedure was used with the Primitive-Variable methods during computation. In order to find the influence factors of the flow field which may have great effects on coal gasification process inside gasifier, difference geometry parameters at various operating conditions were studied by simulation methods. The calculation results show that the basic shape of the flow field is still parabolic even the oxygen gas is injected from the off-axis position. There exist an obvious external recirculation zone with a length less than 1.0m and a small internal recirculation region nears the inlet part. The flow field inside the new gasifier is nearly similar as that of the old 0.5T/D gasifier at same position if the design of burner remains unchanged.

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The Calculation Method of Coal Pyrolysis Products Depending on the Coal Rank (탄종별 열분해 생성물의 조성 계산방법)

  • Pak, Ho-Young;Seo, Sang-Il
    • Transactions of the Korean hydrogen and new energy society
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    • v.21 no.5
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    • pp.442-451
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    • 2010
  • This paper describes the calculation method to obtain the product composition of coal pyrolysis at high pressure and high temperature. The products of coal pyrolysis should be determined for the coal gasifier simulation, and this is the first step of the coal gasifier simulation. The pyrolysis product distribution greatly affects the coal gasifier efficiency such as carbon conversion, cold gas efficiency and the syngas composition at the outlet of the gasifier. The present calculation method is based on the coal ultimate/proximate analysis and several correlations among gasifier pressure, coal properties and pyrolysis products. The calculated products for 5 coals have been compared with those from the commercial pyrolysis model.

Fuel Gas Production from a Down-draft Gasifier using Bionass (하향식 가스화 장치를 이용한 바이오매스로부터의 합성가스 생산)

  • Shim, Jae-Hoon;Hong, Seong-Gu
    • Proceedings of the Korean Society of Agricultural Engineers Conference
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    • 2005.10a
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    • pp.586-591
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    • 2005
  • Syngas or fuel gas production through biomass gasification is a century old technology. Biomass gasification is getting more and more interest recently as one of competitive renewable energy technologies. It does not contribute to increasing greenhouse gases(GHG). A down-draft gasifier was designed and tested for syngas quality using different fuel sets in this study. The gasifier was of about 100kW capacity. Tests were conducted at air flow rates ranging from 10 to $60m^3/hr$. Fuels tested included wood chips and wood char. The results showd that gas quality in terms of flammability was reasonably good when the temperatures were over $600^{\circ}C$ inside the gasifier. Although $800^{\circ}C$ or higher is recommended, gas quality was reasonably good. If insulation was provided outside the gasifier, the temperature would increase. When wood chips were used, the temperature was below $600^{\circ}C$ and gas quality was not good. It seemed that calorific values of fuel and height of reduction zone in the gasifier are very important. The results of the tests would provide important information for designing more improved gasifier and its operation.

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Technical Review of Coal Gasifiers for Production of Synthetic Natural Gas (합성천연가스(SNG) 생산을 위한 석탄가스화기 기술성 검토)

  • Lee, Geun-Woo;Shin, Yong-Seung
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.36 no.8
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    • pp.865-871
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    • 2012
  • Because of the increasing cost of oil and natural gas, energy production technologies using coal, including synthetic natural gas (SNG) and integrated gasification combined cycle (IGCC), have attracted attention because of the relatively low cost of coal. During the early stage of a project, the developer or project owner has many options with regard to the selection of a gasifier. In particular, from the viewpoint of feasibility, the gasifier is a key factor in the economic evaluation. This study compares the technical aspects of gasifiers for a real SNG production project in an early stage. A fixed-bed slagging gasifier, wet-type entrained gasifier, and dry-type entrained gasifier, all of which have specific advantages, can be used for the SNG production project. Base on a comparison of the process descriptions and performances of each gasifier, this study presents a selection guideline for a gasifier for an SNG production project that will be beneficial to project developers and EPC (Engineering, Procurement, Construction) contractors.

Comparison of Design Concepts for Four Different Entrained-Bed Coal Gasifier Types with CFD Analysis (CFD 해석을 통한 4종의 건식 분류층 석탄가스화기 설계개념 비교)

  • Yun, Yongseung;Ju, Jisun;Lee, Seung Jong
    • Applied Chemistry for Engineering
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    • v.22 no.5
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    • pp.566-574
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    • 2011
  • Coal gasifier is a key component for achieving high efficiency in integrated gasification combined cycle and indirect coal liquefaction. Although there have been several successful coal gasifiers that were commercially proven, many different design configurations are still possible for a simple and reliable gasifier operation. Four different gasifier design concepts of dry-feeding were compared in terms of residence time, exit syngas temperature and syngas composition. First, cold-flow simulation was applied to pre-select the configuration concepts, and the hot-flow simulation including chemical reactions was performed to compare the concepts at more actual gasifier operating conditions. There are many limitations in applying CFD method in gasifier design, particularly in estimating slag behavior and slag-tap design. However, the CFD analysis proved to be useful in comparing the widely different gasifier design concepts as a pre-selection tool.

A study on the Gasifier Modeling using a Chemical Equilibrium (화학평형을 이용한 가스화기 모델링에 관한 연구)

  • 정근모;임태훈;오인환;박명호
    • Journal of Energy Engineering
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    • v.2 no.3
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    • pp.276-284
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    • 1993
  • This study is to obtain some basic data which are prerequisite for the conceptual design of gasification process based on entrained-bed type gasifier. The Gibbs free energy minimization method is used to analyze the chemical equilibrium in the gasifier. The modeling results which consider the conventional mass balance and heat balance are compared with the experimental data published by Electric Power Research Institute. The analysis shows that the reaction in a entrained-bed gasifier is influenced mainly by the amount of oxidant, by the temperature of gasifier and by the type of coals.

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Development of 3MWth Circulating Fluidized Bed Biomass Gasifier (3MWth급 순환유동층 바이오매스 가스화공정 개발)

  • Lee, Jeungwoo;Song, Jaehun;Lee, Dongyoon;Choi, Youngtai;Yang, Won;Lee, Uendo
    • 한국연소학회:학술대회논문집
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    • 2012.04a
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    • pp.231-233
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    • 2012
  • Circulating Fluidized Bed (CFB) is a technically and economically proven technology for boiler systems and large CFB coal boilers are making inroads into the domestic power boiler market. For biomass gasification, it is also considered as a very promising technology for commercial. Due to the lack of experiences of a large scale CFB gasifier, however, any large scale CFB gasifiers are hard to in Korea in spite of fast-growing demand of domestic market. In this study, a 3 $MW_{th}$ CFB gasifier was developed for biomass gasification. The CFB gasifier consists of interconnected fast and bubbling fluidized bed reactors including unique features for in-situ tar removal. Various numerical and experimental approaches will be presented such as basic modeling works, investigation of hydrodynamics with a cold model, computational particle fluid dynamics and experiments in the 3 MWth gasifier.

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