Densification of agricultural residues is a key step in a cost-effective, large-scale, biomass feedstock supply system. Lab-scale densification systems exist which can produce large-scale densified corn stover briquettes that measure between 220 and 420 mm in length and with an average bulk density of 190 kg/m3 (dry particle density of 460 kg/m3). MOG (material other than grain ) and pure cob briquettes produced similar lengths and dry particle densities of 424 kg/m3 and 421 kg/m3, respectively. Durability testing, utilizing a modified form of ASABE S269.4 (ASABE Standards, 2007) was conducted to determine the overall product quality associated with these densified briquettes. This publication describes experiments which quantified the durability or briquettes produced with different material types (corn stover, MOG, the chaff from a conventional corn harvest, and pure cobs) and material particle sizes (produced from a combine chopper, MOG, and a hammer mill with a 19-mm screen opening size). The durability rating varied with each of the main effect test parameters and produced a maximum 46% durability rating using pure cobs directly from a combine without additional size reduction. The durability rating was quite low for corn stover and MOG briquettes, and it was improved for pure cob briquettes. Biomass preprocessing in a hammermill significantly reduced durability due to a lack of fiber interaction throughout the large briquette.
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机译：农业残留物的致密化是经济高效的大规模生物质原料供应系统中的关键步骤。现有实验室规模的致密化系统，可以生产大型致密的玉米秸秆团块，其长度在220至420 mm之间，平均堆积密度为190 kg / m3（干颗粒密度为460 kg / m3）。 MOG（除谷物以外的材料）和纯玉米饼团块的长度和干颗粒密度分别相似，分别为424 kg / m3和421 kg / m3。进行了耐用性测试，使用改良形式的ASABE S269.4（ASABE Standards，2007）来确定与这些致密团块相关的整体产品质量。该出版物描述了量化不同材料类型（玉米秸秆，MOG，常规玉米收获中的谷壳和纯玉米芯）制成的团块或球团的耐用性和材料粒度（由联合切碎机，MOG和锤磨机产生的颗粒）的实验屏幕开口尺寸为19毫米）。耐久性等级随每个主要效果测试参数的不同而变化，并且直接使用联合收割机生产的纯玉米芯生产的最大耐久性等级为46％，而没有进一步减小尺寸。玉米秸秆和MOG型煤的耐久性等级相当低，纯玉米芯型煤的耐久性等级有所提高。由于整个大型煤球缺乏纤维相互作用，因此在锤磨机中进行生物质预处理会大大降低耐用性。
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