This paper proposed a novel methodology to determine the angle of repose (AoR) of various biomass materials. Because of irregular shape and varying particle size distribution, slopes of biomass materials are uneven frequently and the two traditional measurement methods of AoR are therefore less applicable and reliable. In general, only partial slopes of heap surface are selected to measure AoR, although a representable slope is barely defined in standard methods. In this case, the subjective selection of slopes may result in significant deviations. Hence, we presented an efficient and reliable measurement method of AoR. In addition to the traditional bottomless cylinder test, the new technology, 3D scan, was used to digitize the generated bulk heap. Then, two data processing methods were introduced to deal with different heap forms: direct calculation based on the linear least-squares regression with regard to the whole heap surface and the pre-selection of planes for excluding outliners caused by particle bridging. For the purpose of simplifying the process, a self-developed graphic user interface (GUI) was used to analyze four kinds of biomass fuels, namely, olive stone, almond shells, forest residues and willow chips, and verify the proposed method. Both methods significantly decreased the deviations of results without increasing operating time and cost.

本文提出了一种新颖的方法来确定各种生物质材料的休止角（AoR）。由于形状不规则和粒径分布变化，生物质材料的斜率经常不均匀，因此两种传统的AoR测量方法适用性和可靠性较差。通常，尽管在标准方法中几乎没有定义可表示的斜率，但是仅选择堆表面的部分斜率来测量AoR。在这种情况下，主观选择坡度可能会导致明显的偏差。因此，我们提出了一种有效而可靠的AoR测量方法。除了传统的无底圆筒测试之外，新技术3D扫描还用于数字化生成的大堆。然后，引入了两种数据处理方法来处理不同的堆形式：直接计算基于整个堆表面的线性最小二乘回归和预选平面以排除由粒子桥接引起的轮廓线。为了简化过程，使用自行开发的图形用户界面（GUI）分析了四种生物质燃料，即橄榄石，杏仁壳，森林残留物和柳叶屑，并验证了所提出的方法。两种方法均显着降低了结果偏差，而又不增加操作时间和成本。橄榄石，杏仁壳，森林残留物和柳编，并验证所提出的方法。两种方法均显着降低了结果偏差，而又不增加操作时间和成本。橄榄石，杏仁壳，森林残留物和柳编，并验证所提出的方法。两种方法均显着降低了结果偏差，而又不增加操作时间和成本。