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首页> 外文期刊>Energy & fuels >Radiative Heat Transfer Conditions in a Rotary Kiln Test Furnace Using Coal, Biomass, and Cofiring Burners
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Radiative Heat Transfer Conditions in a Rotary Kiln Test Furnace Using Coal, Biomass, and Cofiring Burners

机译：使用煤，生物质和共烧燃烧器的回转窑试验炉中的辐射传热条件

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摘要

This work studies the radiative heat transfer in a 580 kW(th) pilot scale test furnace that resembles a full-scale rotary kiln for iron ore pellet production. The aim is to quantify the radiative heat transfer in coal and cofiring flames and also to study the possibility to model the radiative heat transfer for such combustion conditions. Three combustion cases of coal and cofiring are studied, and an evaluation is made using a detailed radiation model. The test furnace is cylindrical and refractory lined but does not rotate and no iron ore pellet bed material is included. In-flame measurements of temperature, gas composition, particle concentration, radiative intensity, and radiative heat flux are conducted for the different fuels and fuel combinations. Overall, the differences in measured radiative intensities and heat fluxes among the three studied fuel cases are minor, which implies that introduction of renewable fuels by cofiring in a full-scale rotary kiln should be feasible with respect to heat transfer conditions. In the model, the furnace is treated as an axisymmetric and infinitely long cylinder, and gas properties are calculated with a statistical narrow-band model, while particle properties are calculated using Mie theory. The modeling results show reasonable to good predictivity compared to the measured intensity data. This indicates that the experimental data is of good quality but also indicates the potential use of the model in full-scale rotary kiln calculations in future work.
机译：这项工作研究了在580 kW（th）中试规模试验炉中的辐射传热，该试验炉类似于用于生产铁矿石颗粒的全尺寸回转窑。目的是量化煤和共燃火焰中的辐射热传递，并研究在这种燃烧条件下对辐射热传递建模的可能性。研究了煤和共燃的三种燃烧情况，并使用详细的辐射模型进行了评估。该试验炉是圆柱形的，衬有耐火材料，但不旋转，不包含铁矿石球团床材料。对不同的燃料和燃料组合进行火焰温度，气体成分，颗粒浓度，辐射强度和辐射热通量的火焰测量。总体而言，在三种研究的燃料箱中，测得的辐射强度和热通量之间的差异很小，这意味着就传热条件而言，通过在全尺寸回转窑中共烧引入可再生燃料应该是可行的。在该模型中，将炉膛视为轴对称且无限长的圆柱体，并使用统计窄带模型计算气体性质，而使用Mie理论计算颗粒性质。与测得的强度数据相比，建模结果显示合理到良好的可预测性。这表明实验数据是高质量的，但也表明该模型在将来的全面回转窑计算中的潜在用途。

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  • 来源
    《Energy & fuels》 |2017年第7期|7482-7492|共11页
  • 作者

    Gunnarsson Adrian; Backstrom Daniel; Johansson Robert; Fredriksson Christian; Andersson Klas;

  • 作者单位

    Chalmers, Environm & Energy Dept, SE-41296 Gothenburg, Sweden;

    Chalmers, Environm & Energy Dept, SE-41296 Gothenburg, Sweden;

    Chalmers, Environm & Energy Dept, SE-41296 Gothenburg, Sweden;

    Luossavaara Kurunavaara Aktiebolag LKAB, Box 952, SE-97128 Lulea, Sweden;

    Chalmers, Environm & Energy Dept, SE-41296 Gothenburg, Sweden;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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