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作 者:管珣 张琰 徐云杰 陶雷 胡晓军 周志辉 张梁 Guan Xun;Zhang Yan;Xu Yunjie;Tao Lei;Hu Xiaojun;Zhou Zhihui;Zhang Liang(School of Enginering,Huzhou University,Huzhou 313000,China;Jiangsu Provincial Agricultural Machinery Testing and Certification Station,Nanjing 210019,China)
机构地区:[1]湖州师范学院工学院,湖州313000 [2]江苏省农业机械试验鉴定站,南京210019
出 处:《农业工程学报》2022年第14期227-234,共8页Transactions of the Chinese Society of Agricultural Engineering
基 金:浙江省自然科学基金项目(LY20E080008);湖州市公益性技术应用研究(2020GZ15)。
摘 要:针对中国南方常见的香樟落叶资源利用率不高的问题,该研究通过试验研究了樟树叶颗粒燃料成型工艺,在用扫描电子显微镜成像法解释了胚料成型机理的理论基础上,通过单因素法分析香樟树叶热压成型过程中原料含水率、原料粒径对成型燃料密度和机械耐久性的影响规律。研究结果表明:燃料密度与机械耐久性呈正相关;随着含水率增加,成型颗粒的密度先增大后减小,机械耐久性持续减小;原料粒径减小后,成型燃料的密度与机械耐久性均有不同程度的增加且数值分布更密集。通过正交试验,验证含水率与粒径间存在对密度与机械耐久性存在显著的交互作用,确定樟树叶颗粒燃料最优压制工艺参数。试验结果表明,在环境温度120℃、压强110.14 MPa、保压时间60 s条件下,最优成型密度工艺参数为:含水率6%、粒径0.6~1 mm,最优机械耐久性工艺参数为:含水率3%、粒径0~0.6 mm。研究结果可为香樟落叶资源利用率提供参考。Thermo-briquetting of biomass fuels has been a commonly-used forming process in recent years. Biomass fuels can be prepared by mechanical pressurization and heating, due to the high thermal efficiency and bulk density. Among them, the hot pressing of biomass pellets cannot fully meet the large-scale production so far. This study aims to explore the effects of moisture content and particle size on the density and mechanical durability of the formed fuel in the briquetting environment using hot pressing. Taking the camphor leaf as the raw material, the specific mechanism was also proposed to determine the correlation between the moisture content and particle size in the press molding, together with the density and mechanical durability of the formed particles. The main research was summarized as follows. Firstly, the theoretical basis of the particle pressing was explained using scanning electron microscopy(SEM) images. Secondly, a single-factor optimization was made to clarify the effects of raw material moisture content and particle size on the density and mechanical durability of the formed fuel during the hot pressing of camphor leaves under limited temperature and pressure. Finally, an analysis was conducted to determine the correlation between density and mechanical durability. The results showed that: 1) A spreading state was observed in the cross-section leaves of camphor leaf molding pellets, indicating a lamellar structure of sheets. The solid-bridge structure of hot-pressed leaves with particle diameters of 0.6-1 mm presented denser connections, more complex structures,and smaller gaps, compared with 1-2 mm leaves. 2) The fuel density of camphor leaf pellets was positively correlated with mechanical durability. Specifically, the mechanical durability increased significantly, as the density increased. 3) The moisture content and pellet size dominated the density and mechanical durability of hot-pressed pellets for the camphor leaf raw materials. The increase in particle size greatly contributed to molding
分 类 号:TK6[动力工程及工程热物理—生物能]
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