• Title/Summary/Keyword: solid bed

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Industrial Solids Processing Applications - Particle Reaction Models and Bed Reactor Models (산업용 고체 처리 공정 - 입자 반응 및 고정층 반응기 모델링)

  • Ahn, Hyungjun;Choi, Sangmin
    • Journal of the Korean Society of Combustion
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    • v.22 no.2
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    • pp.27-35
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    • 2017
  • This paper reviews the previous industrial solid bed process simulations to provide a better understanding of the modeling approaches to the particle reactions in the bed. Previous modeling studies on waste incinerator, iron ore sintering bed, blast furnace, iron ore pellet indurator, and biomass combustor can be seen on the common ground of unsteady 1-D modeling scheme. Approaches to the particle reaction modeling have been discussed in terms of the status of solid particles in the bed, types of reaction progression in a particle, and the consideration of the intra-particle temperature gradient.

Mathematical Approach of Thermo-fluid Characteristics in a Coke Oven (코크스로에서의 열유동 특성에 관한 수치적 연구)

  • Yang, Kwang-Heok;Yang, Won;Ryu, Chang-Kook;Choi, Sang-Min
    • 한국연소학회:학술대회논문집
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    • 2003.12a
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    • pp.43-47
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    • 2003
  • Coke oven is used in an iron-making process for producing coke through devolatilization of the coking coal. An unsteady 2-dimensional model of solid bed is proposed to simulate a coke oven. The model contains governing equations with partial differential equation forms for the solid phase and the gas phase. Drying and devolatilization of coking coal, heat transfer, and generation of internal pores in the coking coal are also reflected to the source terms. Simulation results show a reasonable trend compared with the physical data.

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Modeling Approach of Solid Particle Bed for the Combustion Environment Control (고체 입자 베드 내 반응 환경 변화를 위한 모델링 접근 방법)

  • Ahn, Hyungjun;Choi, Sangmin
    • 한국연소학회:학술대회논문집
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    • 2013.06a
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    • pp.21-23
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    • 2013
  • Various solid particle materials are treated in the industrial processes including fixed-beds or moving grate beds, and modeling approaches have been widely applied to the processes to predict and evaluate their performance. For this study, the modeling approach was applied to iron ore sintering process with various improvement measures. Based on the previous modeling approach, the changes and effects of the improvement measures were discussed at the point of controlling the combustion environment in the bed.

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Modeling of Coking Process in a Coke Oven (코크스 공정에서의 열유동 현상 모델링)

  • Yang, Kwang-Heok;Yang, Won;Choi, Sang-Min
    • Proceedings of the KSME Conference
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    • 2004.11a
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    • pp.1184-1189
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    • 2004
  • Coking process is the thermal decomposition of bituminous coal with final temperature of about $900^{\circ}C$ Because coke plays important roles in ironmaking process in a blast furnace it's essential for developing modeling of coke oven. In this study, An unsteady 2-dimesional model is proposed to simulate coking process in a coke oven. In this model, gas and solid phase are assumed homogeneous continnum and solid bed is assumed as porous media . The model contains governing equations for the solid phase and the gas phase. Complicated phenomena such as swelling, softening, resolidification and shrinkage are neglected and mass loss by drying and devolatilization is reflected by generation of internal pores. Drying, devolatilization, heat transfer and generation of internal pores are also reflected in source terms. Calulated results are compared with experimental data

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Lifter Design for Enhanced Heat Transfer in Rotating Counter-Current Flow Reactor and Application to One Dimensional Heat Balance Model (회전식 대향류 반응기 내 열전달 증진을 위한 리프터 설계와 1차원 열평형 모델로의 적용)

  • Lee, Hookyung;Choi, Sangmin
    • 한국연소학회:학술대회논문집
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    • 2013.06a
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    • pp.51-54
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    • 2013
  • Rotary kiln reactors are frequently equipped with an axial burner with which solid burden material is directly heated. Lifters are commonly used along the length of the system to lift particulate solids and increase the heat transfer between the solid bed and the combustion gas. The material cascading from the lifters undergoes drying and reacting through direct contact with the gas stream. In this study, volume distribution of materials held within lifters was modeled according to the different lifter configuration and appropriate configuration was used for the design purpose. This was applied to the one-dimensional heat balance model of a counter-current flow reactor, which contributes to the increase of the effective contact surface, and thereby enhances the heat transfer.

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Application of Intra-particle Combustion Model for Iron Ore Sintering Bed (제철 소결공정에 대한 단입자 연소 모델의 응용)

  • Yang, Won;Choi, Sang-Min;Jin, Hong-Jong
    • 한국연소학회:학술대회논문집
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    • 2006.04a
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    • pp.181-188
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    • 2006
  • Operation parameters for large scale industrial facility such as iron making plant are carefully selected through elaborate tests and monitoring rather than through a mathematical modeling. One of the recent progresses for better energy utilization in iron ore sintering process is the distribution pattern of fuel inside a macro particle which is formed with fines of iron ore, coke and limestone. Results of model tests which have been used as a basis for the improved operation in the field are introduced and a theoretical modeling study is presented to supplement the experiment-based approach with fundamental arguments of physical modeling, which enables predictive computation beyond the limited region of tests and adjustment. A single fuel particle model along with one-dimensional bed combustion model of solid particles are utilized, and thermal processes of combustion and heat transfer are found to be dominant consideration in the discussions of productivity and energy utilization in the sintering process.

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Development of a Particle Bed Heat Exchanger(II) -An Experimental Study on Heat Transfer Characteristics of Fluidized Bed Heat Exchanger with Double Pipe (Parallelflow) (입자층(粒子層)을 이용(利用)한 열교환기(熱交換器) 개발(開發)에 관(關)한 연구(硏究)(II) - 유동층형(流動層形) 이중관식(二重管式) 열교환기(熱交換器)의 전열특성(傳熱特性)에 대한 실험적(實驗的) 연구(硏究)(병행류식(竝行流式)))

  • Kim, G.C.;Yoo, J.O.;Yang, H.J.;Seo, J.Y.
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.2 no.2
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    • pp.127-136
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    • 1990
  • Air-solid bed has been known to be an effective heat transfer augmentation device which could be applied to heat exchangers. In this study, pressure drop and heat transfer characteristics of vertical annular fluidized bed heat exchanger with air flowing through were studied experimentally. The experiments was conducted to calculate overall heat transfer coefficient on fluidized bed heat exchangers immersed single vertical tube and investigate minimum fluidized velocity in fluidized bed of alumina beads and steel balls. The influence of flow direction, particle diameter, the heights of static bed and air mass fluidizing velocity has been examined. The experimental results showed the optimum operating condition and effective static bed height for fluidized bed heat exchangers. For the same power loss, comparisions of heat transfer effect between the fluidized bed heat exchanger and the single phase forced convetion heat exchanger indicate that both miniaturization of heat exchanger and heat transfer augmentation at low flow velocity are possible by application of the air-solid to heat exchangers.

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Production of Pellet Fertilizer from the Sludge of Thermophilic Aerobic Oxidation System End Its Effects on the Growth of Chinese cabbage and Soil Properties (고온 호기성 산화 시스템의 슬러지로부터 펠렛 비료의 생산과 Chinese cabbage의 생육 및 토양 특성에 대한 영향)

  • Lee Won Il;Hirotada Tsujii;Lee Myung Gyu
    • Journal of Animal Environmental Science
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    • v.10 no.2
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    • pp.101-110
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    • 2004
  • A solid of Thermophilic Aerobic Oxidation(TAO) System was mixed with sawdust or a rice husks. After fermentation was finished, molding machine and a dryer were used, and pellet fertilizer was produced. The fertilizing experiment was carried out as five pieces by Bed soil, TAO solid(TAO-S), TAO pellet fertilizer(TAO-PF), Chemical fertilizer(NPK) and Control(no fertilizer). Growth rate of the Chinese cabbage by each treatment was examined. Analysis of microbe and soil characteristic before and after crop experiment were carried out. When the moisture contents of TAO-PF were $18\%$ and $25\%$, the occurrence rate of microbes for the storage time was increased to $80\%$ and $100\%$ respectively. However, in the $12\%$ of water content treatment was not increased microbes. The concentration of soil bacteria in TAO-PF and TAO-S for 15 day after treatment was $1.5\times10^7\~8.0\times10^7$ CFU/ml, and the concentration of bacteria for 50 day was increased to $6.3\times10^7$ and $8.3\times10^7$ CFU/ml. However, Fungus decreased. The concentration of Actinomycetes was increased in TAO solid, Bed soil and TAO-PF treatment. The TAO-S and TAO-PF treatment were normal to compare to the NPK treatment. In this experiment the height and width of the Chinese cabbage were 22.3 cm, 16.8 cm in Bed soil and 28.8 cm, 21.3 cm in TAO solid. The leaf number of TAO-S, TAO-PF and NPK treatment were similar to 39.8, 38.3, 40.3 sheet. As the result, the TAO-PF knew that use was possible with fertilizer.

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