关键词: 生物质, 压力脉动, 流化床, 功率谱密度

Abstract: Waste wood,peanut shells,rice husk,and pomace of sugarcane were chosen as experiment raw materials and mixed with quartz sands at different mass ratio to investigate the influence of biomass species and mass ratio in a 3D laboratory fluidized bed. The bed size is 1000mm in height and 120mm×32mm of cross section horizontally. The pressure fluctuation inside the bed was recorded and analyzed. The results show that biomass species and mass ratio had negligible effect on minimum fluidization velocity when mass ratio was less than 0.02. Fast Fourier transform was employed to obtain the power spectral density of pressure fluctuation signals. It's shown that the PSD of pressure fluctuation at lower velocity ranged from 10Hz to 15Hz when rice husk was added,and increased to about 20Hz to 25Hz when the velocity increased. Pomace of sugarcane,peanut shells,and waste wood had no main frequency at lower velocity,but when the velocity increased the main frequency was found to be ranged from 10Hz to 15Hz.

Key words: biomass, pressure fluctuation, fluidized bed, power spectral density