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Prediction of high-temperature rapid combustion behaviour of woody biomass particles

机译：木质生物质颗粒高温快速燃烧行为的预测

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摘要

Biomass energy is becoming a promising option to reduce CO2 emissions, due to its renewability and carbon neutrality. Normally, biomass has high moisture and volatile contents, and thus its combustion behaviour is significantly different from that of coal, resulting in difficulties for large percentage biomass cofiring in coal-fired boilers. The biomass combustion behaviour at high temperatures and high heating rates is evaluated based on an updated single particle combustion model, considering the particle size changes and temperature gradients inside particle. And also the apparent kinetics determined by high temperature and high heating rate tests is employed to predict accurate biomass devolatilization and combustion performances. The time-scales of heating up, drying, devolatilization, and char oxidation at varying temperatures, oxygen concentrations, and particle sizes are studied. In addition, the uncertainties of swelling coefficient and heat fractions of volatile combustion absorbed by solid on the devolatilization time and total combustion time are discussed. And the characterised devolatilization time and total combustion time are finally employed to predict the biomass combustion behaviour. At the last, a biomass combustion/co-firing approach is recommended to achieve a better combustion performance towards large biomass substitution ratios in existing coal-fired boilers. (C) 2015 The Authors. Published by Elsevier Ltd.
机译：由于其可再生性和碳中和性，生物质能正成为减少CO2排放的有前途的选择。通常，生物质具有较高的水分和挥发性含量，因此其燃烧行为与煤炭的燃烧行为显着不同，从而导致难以在燃煤锅炉中大量混合燃烧生物质。基于更新的单颗粒燃烧模型，考虑颗粒尺寸变化和颗粒内部的温度梯度，可以评估高温和高加热速率下的生物质燃烧行为。并且还通过高温和高加热速率测试确定的表观动力学被用来预测精确的生物质挥发和燃烧性能。研究了在不同温度，氧气浓度和粒径下加热，干燥，脱挥发分和炭氧化的时间尺度。此外，还讨论了固体挥发吸收的溶胀系数和热分数对脱挥发分时间和总燃烧时间的不确定性。最后，采用特征化的脱挥发分时间和总燃烧时间来预测生物质的燃烧行为。最后，建议使用生物质燃烧/共燃方法，以在现有燃煤锅炉中针对较大的生物质替代率实现更好的燃烧性能。 （C）2015作者。由Elsevier Ltd.发布

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  • 来源
    《Fuel》 |2016年第1期|205-214|共10页
  • 作者

    Li Jun; Paul Manosh C.; Younger Paul L.; Watson Ian; Hossain Mamdud; Welch Stephen;

  • 作者单位

    Univ Glasgow, Sch Engn, Syst Power & Energy Res Div, Glasgow G12 8QQ, Lanark, Scotland;

    Univ Glasgow, Sch Engn, Syst Power & Energy Res Div, Glasgow G12 8QQ, Lanark, Scotland;

    Univ Glasgow, Sch Engn, Syst Power & Energy Res Div, Glasgow G12 8QQ, Lanark, Scotland;

    Univ Glasgow, Sch Engn, Syst Power & Energy Res Div, Glasgow G12 8QQ, Lanark, Scotland;

    Robert Gordon Univ, Sch Engn, Aberdeen AB10 7QB, Scotland;

    Univ Edinburgh, Sch Engn, BRE Ctr Fire Safety Engn, Edinburgh EH9 3JL, Midlothian, Scotland;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Biomass; Combustion; High temperature; Single particle model;

    机译：生物质;燃烧;高温;单颗粒模型;

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