双超声压缩生物质过程中压块松弛密度的影响因素研究

摘要

The relax density of pellet,as an important performance indicators of biomass,had a significant effect on the cost of pellet’s transportation, handling and storage. This paper studied on the relax density of pellets, which were placed in different time.The pellets were pelleted with different pelleting time,different pressure,different pellet weight and different moisture content,and using relaxation ratio directly reflected pellet density under different pelleting conditions. The results showed that the relax density of pellet was gradually decreased under all pelleting condition,but with different degrees of relax density decreasing. The relax ratio of pellet got maximum when the pelleting time was 30s,the pelleting pressure was 0.17MPa,the pellet weight was 1.0g,and the moisture content was 15%.%松弛密度作为生物质成型燃料的一项重要性能指标，对生物质成型燃料的运输、处理和储存有着较大的影响。分别研究了在不同压缩时间、不同预压力、不同生物质重量和不同生物质含水率下，压块的松弛密度随放置时间的变化，并利用松弛比直观反映了在不同的压缩条件下压块松弛密度的松弛程度。研究表明：在不同的压缩条件下，压块的松弛密度都是逐渐减小的，但松弛密度减小的程度不同；压块的松弛比分别在压缩时间为30 s、预压力为0.17 MPa、生物质质量为1.0 g、生物质含水率为20%时达到最大。