AN INDUSTRIAL TEST ON CONTINUOUS CARBONIZATION OF BAMBOO IN MULTITUBULAR MOVING BED

A type of stove which is suitable for continuous carbonization of bamboo was developed, and an industrial test at scale of 200 t annual production of bamboo char was carried out. The bamboo stalks were processed into bamboo slices of length 35 cm width 4-7 cm. The processed bamboo residue was broken into smaller pieces less than 10 cm. Raw materials were fed into the feed opening, to shift downward progressively by gravity,then subjected to drying, charring and calcination sequentially. After natural cooling, the char was discharged regularly. Gas rose along boiler tube, accompanied with distillation and heat transfer, then condensated into bamboo pyroligneous liquid. The result showed: yield of bamboo char was 24.7% of the dry bamboo timber; fixed carbon content above 94%, average absorbing value of iodine 700 mg/g, electrical resistance value generally under 10 Ω; yield of bamboo pyroligneous liquid was 20% of the dry bamboo timber, pH value at 2.4-2.8, the average content of total acid 5.07%, average soluble tar content 1.17%; average consumption of bamboo residue is 0.287 t per ton of bamboo char.