番茄秸秆与发酵菌种立式螺旋混合设备参数优化  

Parameter Optimization of Vertical Screw Mixing for Tomato Straw and Fermentation Strains

作　　者：李萍萍[1,2] 吴硕[1] 张西良[3] 王纪章[1] 徐云峰[1] 

机构地区：[1]江苏大学现代农业装备与技术教育部重点实验室,镇江212013 [2]南京林业大学生物与环境学院,南京210037 [3]江苏大学机械工程学院,镇江212013

出　　处：《农业机械学报》2016年第11期114-120,共7页Transactions of the Chinese Society for Agricultural Machinery

基　　金："十二五"国家科技支撑计划项目(2014BAD08B04);国家公益性行业(农业)科研专项(201203095);国家自然科学基金项目(51475212);江苏省普通高校研究生科研创新计划项目(CXLX12-0625)

摘　　要：针对番茄秸秆基质化造肥处理过程中秸秆碎料与发酵菌种难以混合问题,提出立式螺旋混合搅拌装置。通过对物料的动力学分析、立式螺旋混合的离散元仿真分析和试验表明,混合3 min以后,混合变异系数小于10%,平均功耗小于0.078 1 k W,验证了对秸秆基质化处理的可行性;随搅拌叶片螺距增加,混合变异系数得到降低,功耗呈先增大后减小的趋势;随搅拌叶片转速的增加,混合变异系数同样得到降低,功耗呈大幅度提高的趋势;随填料高度的增加,混合变异系数和功耗呈增加趋势;影响混合变异系数的主次顺序依次为螺距、转速和填料高度。构建了混合变异系数与结构和工作参数的数学模型,并进行优化,得到当填料高度440 mm、转速30 r/min、螺距400 mm时,物料混合变异系数最优为4.3%;将离散元仿真功耗与试验值进行对比,误差均值为13.5%,验证了仿真结果的正确性。Straw debris and fermentation strains are difficult to mix together in the fertilizer manufacturing process of tomato stalks. In order to solve the problem, a vertical screw mixer was put forward and the kinetics analysis of stuffing material was carried out, and the mixing process in the mixer was analyzed numerically by DEM simulation and measurement. The results showed that the variation coefficient of mixing was less than 10% and the average power consumption was less than 0. 078 1 kW after stirring for 3 min, confirming the feasibility of the mixer in fertilizer manufacturing process of tomato stalks. The variation coefficient of mixing was decreased with the increase of pitch of blade, but the power consumption achieved the maximum at a medium pitch. With the increase of rotational speed, the variation coefficient of mixing was decreased as well, but the power consumption was increased substantially. With the increase of stuffing material height, variation coefficient of mixing and the power consumption were increased. The rank order for the effect on the variation coefficient of mixing from the most important to the least important was pitch of blade, rotational speed and stuffing material height. A mathematical model of variation coefficient of mixing with mixer geometrical variables and work parameters was built and optimized. The optimum variation coefficient for mixing was 4.3% when stuffing material height was 440 mm, rotational speed was 30 r/min and pitch of blade was 400 mm. The simulated results were compared with the tested data, showing a 13.5% error between simulation and observation. This suggested that the simulated results were correct and revealed efficient mixing mechanism of the mixer. The study provides a theoretical basis and specific equipment in tomato straw and fermentation strains for research and development of efficient mixing.

关 键 词：番茄秸秆 发酵菌种 基质化 混合搅拌装置 参数优化 

分 类 号：S224.2[农业科学—农业机械化工程] S147.12[农业科学—农业工程]