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Onset of smoldering fires in storage silos: Susceptibility to design, scenario, and material parameters

机译：储存筒仓中闷烧火灾的发作：设计，场景和材料参数的易感性

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摘要

Biomass fuels in large storage units are prone to self-heating and ignition causing smoldering fires. Here, the susceptibility of such ignition processes to parameters is explored through small-scale experiments. In a silo geometry, wood pellets samples of size 0.75 to 1.5 kg were heated from below to initiate smoldering, while the top was open, allowing convective exchange of gases between the porous sample and the surroundings. The thermally insulated sidewalls reduce the heat flow in lateral direction in a similar way that additional pellets material would do in a larger set-up. Thus, the present experimental set-up mimics a much larger system in lateral direction. After heating was terminated, the procedure led to self-sustaining smoldering or spontaneous cooling, depending on parameters.The transition zone between smoldering and non-smoldering was explored under variation in sample size, imposed heating, pellets type, and height of sample container. Logistic regression was applied to fit the experimental data to a model. The model predicted the probability of an experiment to result in either smoldering or non-smoldering under variation in parameters - and the parameters were sorted according to importance. The duration of the external heating was found to be the most influential parameter. For risk assessments in connection with large biomass fuel storage units, this result indicates that the temperature increase could be more important than the size and geometry of the storage unit and the stored material type.
机译：大型存储单元中的生物质燃料容易发生自加热和点火，导致闷烧的火灾。这里，通过小规模实验探讨了这种点火过程对参数的易感性。在筒仓几何形状中，从下方从下面加热0.75至1.5千克的木颗粒样品以启动闷烧，而顶部是开放的，允许在多孔样品和周围环境之间对气体交换气体。热绝缘侧壁以类似的方式减少横向方向的热流，使得额外的颗粒材料将在更大的设置中进行。因此，目前的实验设置模仿横向的更大的系统。加热后，该程序导致自我维持的闷燃或自发冷却，这取决于参数。在样品大小的变化下探讨了闷燃和非稀释之间的过渡区，施加的加热，颗粒类型和样品容器的高度。应用逻辑回归以将实验数据适用于模型。该模型预测了实验的可能性，导致在参数变化下闷烧或非闷烧 - 并且根据重要性进行分类参数。发现外部加热的持续时间是最有影响力的参数。对于与大型生物量燃料储存单元有关的风险评估，该结果表明温度升高可能比存储单元和存储材料类型的尺寸和几何形状更重要。

著录项

  • 来源
    《Fuel》 |2021年第15期|118964.1-118964.12|共12页
  • 作者

    Villacorta Edmundo; Haraldseid Ingunn; Mikalsen Ragni Fjellgaard; Hagen Bjarne Christian; Erland Sveinung; Kleppe Gisle; Krause Ulrich; Frette Vidar;

  • 作者单位

    Western Norway Univ Appl Sci Bjornsonsgt 45 N-5528 Haugesund Norway|Otto von Guericke Univ Univ Pl 2 D-39106 Magdeburg Germany;

    Western Norway Univ Appl Sci Bjornsonsgt 45 N-5528 Haugesund Norway|Otto von Guericke Univ Univ Pl 2 D-39106 Magdeburg Germany;

    Western Norway Univ Appl Sci Bjornsonsgt 45 N-5528 Haugesund Norway|Otto von Guericke Univ Univ Pl 2 D-39106 Magdeburg Germany|RISE Fire Res AS Tillerbruvegen 202 N-7092 Tiller Norway;

    Western Norway Univ Appl Sci Bjornsonsgt 45 N-5528 Haugesund Norway;

    Western Norway Univ Appl Sci Bjornsonsgt 45 N-5528 Haugesund Norway;

    Western Norway Univ Appl Sci Bjornsonsgt 45 N-5528 Haugesund Norway;

    Otto von Guericke Univ Univ Pl 2 D-39106 Magdeburg Germany;

    Western Norway Univ Appl Sci Bjornsonsgt 45 N-5528 Haugesund Norway;

  • 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 fuels; Storage; Self-heating; Smoldering; Susceptibility to parameters;

    机译：生物质燃料;储存;自加热;闷烧;对参数的敏感性;

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