近期，我院教师顾丛汇、姚寿广教授等的“Visual Experimental Analysis on the Residence Time of Flexible Biomass Particles in a Baffled-Rotating Cylindrical Tube”研究成果在《Energy & Fuels》上发表。
The drying of biomass or biofuels is a major issue during pretreatment because of high initial moisture content, which results in low energy efficiency, combustion temperature and high emission of hydrocarbons. As the motion behaviors of biomass fuels play an important role in the drying process, it is of great significance to investigate the motion of biomass. In this paper, visualization experiments on the motion of flexible non-spherical biomass particles in a baffled rotating cylindrical tube were performed. The residence time of biomass particles was obtained and analyzed by taking into account, gas velocity, mass flow rate of flexible biomass, initial moisture content of biomass particles, slope and rotational speed of the cylindrical tube and other parameters under several operational conditions. The results indicated that the mean residence time of flexible biomass increased with the increase of mass flow rate and initial moisture content, and decreased with the increase of the cylindrical tube’s rotational speed and slope, and the velocity of the gas phase. Despite of quite small sliding friction coefficient between the tube’s inner wall and biomass particles, larger slope could lead to stronger the sliding friction force in the axial direction when these biomass particles moved to the bottom of the tube. Mean residence time is observed to decrease significantly and gradually decrease with the increase of rotational speed from 6 r/min to 9 r/min, and from 9 r/min to 18 r/min, respectively. In addition, mean residence time increased from 78.5s to 99.4s when the inlet mass flow rate increased from 60 kg/h to 240 kg/h without gas phase, but it increased from 57.4s to 78.5s within the same range of inlet mass flow rate at the gas velocity of 0.3 m/s.