关键词: 两箱式, 秸秆成捆炭化, 烟气辅助加热, 正交试验

Abstract: In order to resolve the problem of treating crop straws for smallscale farmers in rural areas, this paper designed twobox flue gas indirect heating fixedbed biomass carbonizing equipment with a builtin combustion chamber and two rectangular boxes as carbonizing chambers for carbonizing bundles of crop straws. The device utilized external heating and high temperature heating assisted by flue gas to improve the uniformity of carbonization temperature distribution and reduce heat loss. Taking corn straw as raw material, the fixed carbon content, carbon yield and final carbonization temperature were used as indicators to investigate the influence of inlet air volume, heating time and bundle diameter of corn straw on the index through orthogonal test. The results showed that the equipment worked well, and the air intake, heating time and bundle diameter had significant effects on the fixed carbon content; the bunch diameter had the greatest influence on the carbon yield and the final carbonization temperature. The optimal parameters combination were a fan speed of 2 800 r·min-1, the heating time of 4 h and the bundled diameter of 35 cm. At this time, the overall yield of equipment carbon was the highest.