Zhang Kexin, Song Shuangyan, Chen Zhongjia, Zhou Jianbo
Beijing Forestry University, Beijing 100083, China.
Forestry New Technology Research Institute, Chinese Academy of Forestry, Beijing 100091, China.
Polymers (Basel). 2020 Mar 18;12(3):674. doi: 10.3390/polym12030674.
The binder can improve the physical characteristics of biomass pellets by forming solid bridges and increasing the adhesion of biomass materials. Taking pine sawdust as raw material and brown sugar water with different concentration as a binder, this study adopted spraying and stirring methods, respectively, and mixed brown sugar water with biomass in diverse proportions. The characteristic of pellets such as durability, relaxation ratio and compressive strength were studied by orthogonal design. Through range analysis, BP (Back Propagation) neural network factor significance analysis and mapping the relationship between physical properties and factors according to the importance of each factor, the effect of densification variables on the physical characteristics of biomass pellets was studied, and the outcome of adding brown sugar water binder to raw material by spraying method in improving the densification quality of biomass was explored. Results showed the brown sugar water binder added to pine sawdust by spraying method could mix the binder and biomass raw material more evenly compared with the stirring method. The relaxation ratio of pellets obtained by spraying method was reduced by 13.47%. The optimal densification conditions of pine sawdust were when the compaction pressure was 100 MPa, the mass ratio of brown sugar to water was 2:1, the proportion of brown sugar water to biomass material was 3%, and the adding method was spraying.
粘结剂可以通过形成固体桥接并增加生物质材料的粘附力来改善生物质颗粒的物理特性。本研究以松木锯末为原料，以不同浓度的红糖水作为粘结剂，分别采用喷雾法和搅拌法，将红糖水与生物质按不同比例混合。通过正交设计研究了颗粒的耐久性、松弛率和抗压强度等特性。通过极差分析、BP（反向传播）神经网络因素显著性分析，并根据各因素的重要性绘制物理性能与因素之间的关系图，研究了致密化变量对生物质颗粒物理特性的影响，并探讨了通过喷雾法向原料中添加红糖水粘结剂对提高生物质致密化质量的效果。结果表明，与搅拌法相比，通过喷雾法向松木锯末中添加红糖水粘结剂能使粘结剂与生物质原料混合更均匀。喷雾法制备的颗粒松弛率降低了13.47%。松木锯末的最佳致密化条件为：压制压力为100MPa，红糖与水的质量比为2:1，红糖水与生物质材料的比例为3%，添加方法为喷雾法。
