doi:10.16186/j.cnki.1673-9787.2020.3.12

Received:2019/08/20

Revised:2019/10/15

Published:2020/05/15

Experimental study and numerical simulation of fluidization characteristics of biomass fluidized bed

HU Xiaojin1, LIU Sanju1, LIU Jun1, CHENG Songting1, XU Yanan1, WANG Fahui2, WEN Xiaoping2

1.Hubei Huadian Xiangyang Power Generation Co. ， Ltd. ， Xiangyang  441141 ， Hubei， China;2.School of Mechanical and Power Engineering， Henan Polytechnic University， Jiaozuo  454000 ， Henan， China

Abstract:In order to study the fluidization state of fluidized bed material during biomass gasification， the experimental system of biomass fluidized bed was set， with air as the fluidized medium， the quartz sand fluidization experiment was carried out. A DEM（ discrete element method） model was used to numerically calculate the particle flow characteristics in the zone space of the fluidized bed. The results showed that when the stacking density of bed material and temperature were constant， the critical fluidization wind speeds of corresponding quartz sands with particle diameters of 0. 56 ，0. 35 ，0. 18 mm were 0.017 ，0.065 ，0. 170 m/s， respectively. When the particle size of the material was smaller， the fluidized wind speed required to reach the fluidized state was smaller. Compared with experimental results， the average error of numerical simulation results was 23. 1 % ， and the prediction of critical wind speeds were basically consistent with the experimental results， which indicated that the computational model had a good prediction effect on the bubbly two-phase flow state.

Key words:biomass;fluidized bed;fluidization characteristic;critical velocity;numerical simulation

生物质流化床流化特性试验研究与数值模拟_胡小金.pdf