Study on two-stage feeding using pulse pneumatic conveying system for woody biomass fast pyrolysis
WU Yu;SI Hui;WANG Wenliang;WANG Xiao;School of Technology, Beijing Forestry University;
To solve the problem of regurgitation during fast pyrolysis feeding process, a two-stage of pulse pneumatic conveying feeding test apparatus was developed. To get the frequency controlling methods of feeding rate, a test which adopting woody biomass saw dust as conveying materials was carried out. Based on the test device, the frequency matching scheme of pneumatic conveying was put forward and optimized,and single factor experiment of the frequency of the two-stage nozzles which is the key factor was carried out. The results show that the mass flow rate can be increased by intermittently closing primary nozzle A(no more than residence time which is about0.7~0.9 s or decreasing the diameter of nozzle. Two-stage frequency optimal matching scheme and matching time of cyclic progress was determined that nozzle A opened and B closed(0.8~1.2 s)—nozzle A opened and B opened(0.2~0.5 s)—nozzle A closed and B opened(0.7~0.9 s)—nozzle A opened and B opened(0.8~1.0 s). The average larch particle mass flow rate of this equipment under the scheme is about 21 g/min.