生物质颗粒声场流化特性研究

Fluidization Characteristics of Biomass Particles in an Acoustic Fluidized Bed

在内径53mm,高800mm的声场鼓泡流化床中,采用压力探针研究生物质颗粒的流化特性,考察了添加惰性组分和引入声场对生物质流化质量的影响.结果表明,添加惰性组分可以显著改善生物质流化质量,惰性组分质量分数越大流化质量越好.声场的引入可使生物质在较高质量分数(小麦秸秆含量为50%,木粉含量为60%)下实现流化,降低生物质颗粒的最小流化速度.声波强度越大生物质颗粒的最小流化速度越小;固定声压级,在最佳频率范围(150~200Hz)内生物质颗粒最小流化速度最小.

The fluidization behavior of binary mixtures of biomass and quartz sand was investigated using pressure sampling system in a bubbling fluidized bed(Φ53 mm×800 mm).The biomass component was difficult to fluidize,while the mixture of quartz sand and biomass can fluidize smoothly.As the biomass content of binary mixtures increased,the minimum fluidization velocity of the binary mixtures also increased.The effects of sound frequency and sound pressure level on the fluidization behavior of binary mixtures were investigated.It was observed that sound wave improved the fluidization of the high weight percentage of biomass in an acoustic fluidized bed.The experimental results showed that the minimum fluidization velocity decreased with the increase of sound pressure level at the same sound frequency.The minimum fluidization velocity had a minimum value when the frequency of sound wave increased from 50~400 Hz at a fixed sound pressure level.