Authors

Abstract

In this study, a staged agitating equipment with double spiral ribbon was designed to destroy choking and accumulation of agricultural waste in the mixing process, by improving the mixing uniformity and reducing the residual amount of corn stalks and cow dung. To determine the optimal working parameters of the equipment, the ternary quadratic regression orthogonal rotation combined experiment was carried out by using the mixing uniformity and residual rate of material as the evaluation indexes and the spindle speed, full coefficient and mixing time as the influencing factors. The results showed that the order of the influences on the mixing uniformity was spindle speed>mixing time>fullness coefficient, and the order of the influences on the residual rate of material was fullness factor>spindle speed>mixing time. The study established a regression model of influencing factors and evaluation indexes, and analysed the influence of significant factors and their interaction on evaluation indexes. The optimum combination after parameter optimization based on response surface method was determined to be as follows: spindle speed of 38.00rad/min, full coefficient of 55.00%, mixing time of 9.33min. While the mixing uniformity and residual rate of material corresponding to the verification test were 91.25% and 4.81%, respectively, the relative error of the predicted result was less than 0.5%. The study meets the requirements of mixing agricultural waste materials to make fertilizers, and provides technical solutions for improving the localized resource utilization of agricultural waste.

Abstract in Chinese

针对农业废弃物搅拌过程壅堵和积料的问题，本研究为提高玉米秸秆和牛粪混合均匀性、降低物料残留量，设计了一种分段式、双螺带搅拌装置。为确定装置最佳工作参数，以主轴转速、充满系数和混合时间为试验因素，以混合均匀度和物料残留率为评价指标，采用三元二次回归正交旋转组合试验方法进行试验与响应面分析。结果表明：影响混合均匀度的主次因素为：主轴转速＞混合时间＞充满系数，影响物料残留率的主次因素为：充满系数＞主轴转速＞混合时间。建立试验因素与评价指标的回归模型，分析显著因素及其交互作用对评价指标的影响。基于响应面法进行参数优化，确定最终优化参数组合为：主轴转速38.00rad/min，充满系数55.00%，混合时间9.33min，对应验证试验的混合均匀度和物料残留率分别为91.25%和4.81%，与模型预测结果相对误差小于0.5%。该研究满足农业废弃物料制肥的混配要求，为提高农业废弃物属地化资源利用提供技术方案。