立式有机废物发酵系统搅拌器的阻力分析

Resistance analysis of the agitator in the vertical organic waste fermentation treatment system

研究开发了一种立式有机废弃物发酵系统,系统由主轴搅拌器、上料装置、通风系统、传动机构、卸料装置组成。系统通过上料装置进料并接入适量菌种,由主轴搅拌器搅拌混合,通风系统提供足量新鲜空气,传动机构为系统提供动力,待发酵完成由卸料装置完成卸料。针对系统在固定工况条件下主轴搅拌器发酵搅拌过程中的阻力展开研究,运用现代化离散元模型(EDEM)模拟和分析物料在筒体内的运动和搅拌器受力情况,并建立搅拌器数学模型,对搅拌阻力进行理论计算。结果表明:EDEM数值模拟计算得到搅拌器转矩平均值为84 927.6 N·m,理论计算得到搅拌器理论转矩计算值为86 549 N·m,比模拟值略大,与数值模拟计算结果具有一致性。

An vertical organic waste fermentation treatment system has been developed, which composed of main agitator, feeding device, ventilation system, transmission, and discharge part. The organic waste was fed through the feeding device as well as the appropriate bacteria, and then mixed by the main agitator. The ventilation system provided adequate fresh air to ensure the organic waste fermenting completely. The transmission transmitted power to the whole system. When the fermentation is finished, the organic waste was discharged by the discharge part. Resistance of the main agitator was studied during the fermentation process under normal condition. The mathematical model of the agitator was established to simulate and analyze the movement of the material in the cylinder and the force on the agitator by discrete element soft of EDEM. The results show that the average torque on the main agitator was 84 927.6 N·m obtained by simulation, which slightly larger than the value of 86 549 N·m from theoretical calculation. It is found that the simulation by EDEM is consistency with theoretical calculation.