Authors

Abstract

Organic fertilizer applicator currently has poor versatility toward different properties. A solid-liquid mixed fertilizer device is designed based on the numerical simulation method of solid-liquid two-phase flow. Based on the parameters analysis and viscosity measurement of different organic fertilizer particles, the ribbon-screw type agitator was selected as the basic structure. Using Box-Behnken, three test factors including agitator speed, the mixture ratio of fertilizer and water, agitator height were determined, the agitator was optimized with the test evaluation indexes, the density variation coefficient, and agitator shaft power on 10 mixing planes in the agitator. The result showed that the rotating speed was 80 r/min, the mixing ratio of fertilizer and water was 1.2, and the agitator height was 700 mm, the working parameter combination is optimal. A coarse particle solid-liquid two-phase flow model of the fertilizer discharge pump was established, to obtain the external characteristic curve of the fertilizer pump and analyse the influence of different mixing ratios of fertilizer and rotation speed on the fertilizer pump. In order to prevent the separation of fertilizer and water and achieve better effect, 1140 r/min was comprehensively determined as the working speed of the fertilizer pump. The strength of the agitator meets the working requirements. The solid-liquid deep fertilizer device text bench for organic fertilizer was set up under the optimal working parameters, the result shows that the research results can provide a reference for the design of organic fertilizer solid-liquid mixing fertilizer applicator.

Abstract in Chinese

针对目前有机肥施肥机对不同形态有机肥通用性差，基于固液两相流数值模拟方法，分析并设计一种有机肥固液混合施肥装置。根据多种有机肥颗粒参数分析和黏度测定，通过六种搅拌器固液两相流试验筛选螺带-螺杆式搅拌器型为搅拌装置基本结构。采用Box-Behnken试验设计方法进行搅拌器优化，以搅拌器转速、肥水混合比、搅拌器高度3个试验因素，肥料桶内10个混合平面的密度变异系数和搅拌器轴功率为试验评价指标，转速80r/min、肥水混合比1.2、搅拌器高度700mm时效果最优，10个截面的平均密度为713.16kg/m3，轴功率为24.07kW，变异系数为4.32%。建立排肥泵粗颗粒固液两相流模型，获取排肥泵外特性曲线及排肥泵泵肥影响因素，选取1140r/min为排肥泵工作转速。在最优工作参数下搭建有机肥固液混合施肥装置试验台架，台架试验结果表明研究结果可为有机肥固液混合施肥机设计提供参考。