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Internal particle size distribution of biofuel pellets

机译：生物燃料颗粒的内部粒度分布

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Several methods for disintegration of biofuel pellets were tested and compared for their ability to break up the pellets into the original particles of the raw material. Analyses performed on softwood pellets and straw pellets concluded that wet disintegration in water at ambient temperature is insufficient for a determination of the internal particle size distribution of wood- and straw pellets. When the wet disintegration was performed with water heated to the boiling point and coupled with mechanical disintegration in terms of stirring a more complete disintegration of the pellets was obtained. Based on the results obtained in the initial study a round robin was set up including six European laboratories where the selected method was tested. In the round robin test the method combining heated water and stirring of the slurry was tested on solid biofuel pellets produced of comminute straw, deciduous wood and coniferous wood respectively. With the method a satisfactory disintegration was obtained of all three types of pellets. Further wet disintegration of coniferous pellets was compared to a dry disintegration using a hammer mill. The dry disintegration of the coniferous pellets resulted in smaller particle sizes compared to the wet disintegration using heated water and stirring of the slurry indicating a further disintegration of the original particles in the hammer mill process. Overall the wet disintegration combined with mechanical impact was found to be the most suitable method for disintegration of solid biofuel pellets. Combined with sieving analysis the method gives realistic image of the internal particle size distribution of solid biofuel pellets.
机译：测试了几种分解生物燃料颗粒的方法，并比较了它们将颗粒分解为原料原始颗粒的能力。对软木粒料和稻草粒料进行的分析得出结论，环境温度下水中的湿崩解不足以确定木材和稻草粒料的内部粒度分布。当用加热到沸点的水进行湿崩解并且在搅拌方面与机械崩解相结合时，获得了粒料的更完全崩解。根据最初研究中获得的结果，建立了包括六个欧洲实验室在内的轮循机制，对所选方法进行了测试。在循环试验中，将加热水和浆液搅拌相结合的方法在分别由粉碎的稻草，落叶木材和针叶木材制成的固体生物燃料颗粒上进行了测试。用该方法，所有三种类型的颗粒均获得令人满意的崩解。将针叶丸的进一步湿崩解与使用锤磨机的干崩解进行比较。与使用热水的湿崩解和浆液的搅拌相比，针叶小球的干崩解产生较小的粒度，这表明锤式粉碎过程中原始颗粒的进一步崩解。总的来说，湿崩解与机械冲击相结合是最适合分解固体生物燃料颗粒的方法。结合筛分分析，该方法给出了固体生物燃料颗粒内部粒度分布的真实图像。

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