两箱式烟气间接加热固定床炭化炉研究

Study on a Straw Carbonizing Furnace with Two Chambers by Indirect Heating of Flue Gas

为解决小型农户处理秸秆的问题,设计两箱式烟气间接加热固定床炭化设备,成捆炭化生物质秸秆。该设备利用外加热、高温烟气辅助加热提高炭化室温度分布均匀性,减少热损失。选取刚收获不久的玉米秸秆作为炭化原料,以玉米秸秆的固定碳含量、炭产率、炭化终温为指标,利用正交试验研究风机转速、加热时间、扎捆直径三个可控参数对设备炭化性能的影响。结果表明,设备运行良好,进风量、加热时间、扎捆直径对固定碳含量均有显著影响;扎捆直径对炭产率和炭化终温影响最大。确定最优方案为风机转速2800 r·min^-1、加热时间4 h、扎捆直径35 cm,此时设备产炭总体收益最高。

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 2800 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.