Experimental studies of birch barking waste shredding
2019
Vlasov, J., Saint-Petersburg State Forest Technical Univ. named after S.M. Kirov (Russian Federation) | Katsadze, V., Saint-Petersburg State Forest Technical Univ. named after S.M. Kirov (Russian Federation) | Igotti, I., Saint-Petersburg State Forest Technical Univ. named after S.M. Kirov (Russian Federation) | Teppoev, A., Saint-Petersburg State Forest Technical Univ. named after S.M. Kirov (Russian Federation)
The study aims to obtain regression equations relating to the parameters of the knife shredder, mechanical properties of birch debarking waste, fractional composition of shredded waste and energy consumption of the shredding process. The results base on active controlled experiment, implemented to the second-order Box-Benken plan with 6 experiments in the centre of the plan. Pilot plant uses Erdwich M600/1-400 industrial waste shredder. The experimental material is obtained after debarking birch assortments on a rotary debarking machine. The target functions include: average size of the waste after shredding and specific energy consumption. The controllable factors include: moisture content of the raw material, average particle size of the waste before shredding, angle of sharpening of the shredder knives, frequency of rotation of the shredder working body, diameter of the shredder sieve. The study compiles second-order regression equations that relate the average particle size after shredding, shredding ratio, specific energy consumption, average fraction of the waste before shredding, angle of sharpening of the knives, rotation frequency and the diameter of the sieve holes. Models are adequate by Fisher criterion. The study of the obtained equations shows that the minimum energy consumption is achieved when the angle of sharpening of the knives is 30o and the rotational speed of the working body is 32 rpm. At optimal parameters of the process, shredding 10–15 times, the energy consumption for shredding the waste of birch debarking averages 1.5–2.7 MJ per kilogram of raw material, depending on its moisture content. Promising areas for further research are in the field of studying the energy consumption of shredding debarking waste of coniferous species of wood – pine and spruce.
Показать больше [+] Меньше [-]