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Modelling spontaneous ignition of wood, char and RDF in a lab-scale packed bed

机译：在实验室规模的填充床中模拟木材，木炭和RDF的自燃

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摘要

Many municipal waste combustors use preheated primary air in the first zone to dry the waste. In most cases the preheat temperature does not exceed 140℃. In previous experiments it is found that at temperatures around 200℃, in some circumstances, self- or spontaneous ignition can be achieved. Using preheated air can be a powerful tool to control the ignition and combustion processes in a waste combustion plant. To use this tool effectively, the influence of the preheated air on the fuel bed needs to be well understood. The present work is done to develop a model that predicts the spontaneous ignition temperature of the fuel bed and the critical temperature of the primary air at which the fuel bed ignites. The influence of primary air flow rate and addition of inert are modeled for a packed bed of wood. From the model a dimensionless parameter is derived in which all investigated parameters (fuel type, air flow rate and inert fraction) are combined. This parameter appears to be sufficient to describe both the spontaneous ignition and the critical air temperature. The results from the model are validated with experiments presented in previous work [1 ]. The model slightly over-predicts the temperatures by 6-7℃, and the trends are predicted well. Besides calculations for the temperatures, the ignition time and location are calculated as well. The ignition time is under-predicted due to the assumption of a uniform temperature distribution inside the particles. The location of ignition is predicted well. For char, a minimum spontaneous ignition temperature is derived from DSC measurements. The temperature at which the interaction of char and oxygen switches from endo- to exothermic seems to coincide with the spontaneous ignition temperature.
机译：许多市政废物燃烧器在第一个区域中使用预热的一次空气来干燥废物。在大多数情况下，预热温度不超过140℃。在先前的实验中发现，在大约200℃的温度下，在某些情况下可以实现自燃或自燃。使用预热的空气可以成为控制废物燃烧厂点火和燃烧过程的有力工具。为了有效地使用该工具，需要充分了解预热空气对燃料床的影响。完成本工作以开发一种模型，该模型可预测燃料床的自燃温度和燃料床点火的一次空气的临界温度。一次空气流速和惰性气体添加的影响是针对木材填充床建模的。从模型中得出无因次参数，其中将所有研究的参数（燃料类型，空气流速和惰性分数）组合在一起。该参数似乎足以描述自燃和临界空气温度。该模型的结果已通过先前工作[1]中提出的实验进行了验证。该模型将温度略微高估了6-7℃，趋势得到了很好的预测。除了计算温度外，还计算点火时间和点火位置。由于假设颗粒内部温度分布均匀，因此点火时间预测不足。点火的位置可以很好地预测。对于炭，最低自燃温度由DSC测量得出。炭和氧相互作用从吸热转变为放热的温度似乎与自燃温度一致。

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  • 来源
    《Fuel》 |2013年第6期|190-196|共7页
  • 作者

    Maarten van Blijderveen; Eddy A. Bramer; Gerrit Brem;

  • 作者单位

    TNO, Schoemakerstraat 97, 2628 VK Delft, The Netherlands,University of Twente, Department of Thermal Engineering, Drienerlolaan 5, 7522 NB Enschede, The Netherlands;

    University of Twente, Department of Thermal Engineering, Drienerlolaan 5, 7522 NB Enschede, The Netherlands;

    University of Twente, Department of Thermal Engineering, Drienerlolaan 5, 7522 NB Enschede, The Netherlands;

  • 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

    ignition; packed bed; wood; RDF; char;

    机译：点火;床铺木;RDF;烧焦;

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