农业工程学报2018，Vol.34Issue(3)：49-56,8.DOI:10.11975/j.issn.1002-6819.2018.03.007
有机肥生产中的多段式搅龙设计与性能试验
Design and performance experiment of multi-segment type auger in process of organic fertilizer production
摘要
Abstract
Organic fertilizer is obtained from animal and plant residues or waste. Organic fertilizer can improve soil fertility, and can provide comprehensive nutrition for crops. In recent years, organic waste is decomposed into organic fertilizer in a short time by using rapid fermentation technology, and the fermentation is quick and free of pollution. This technology requires homogeneous fermentation conditions in the fermentation bin. Many scholars apply the auger to the organic fertilizer fermentation equipment to stir to improve the degree of automation. In the process of organic fertilizer production, it is easy to cause the problems of blocking material, uneven mixing of materials and end accumulation by traditional auger, which affect the full fermentation, resulting in low fertilizer efficiency and poor quality. In order to solve the problems, a multi-segment type auger is designed. The device is composed of telescopic gear, feeding section, variable diameter feeding section, large diameter feeding section, discharging section and reverse rotating section. The mechanism of the material mixing uniformity is clarified by eccentric design and analyzing the movement of the telescopic gear. The anti-blocking mechanism of the device is defined through the design of variable diameter structure and the analysis of material filling degree. The problem of deposition is solved through the design and analysis of the counter rotating section. The performances of the designed multi-segment type auger and the traditional structure auger are compared with the discrete element analysis software EDEM. By comparing and analyzing the standard deviation between materials mixing degree and optimal materials mixing degree in different positions, it is derived that when the standard deviation of mixing uniformity of the material reaches 0.2, the distance required by the multi-segment type auger is 0.6 times as much as that of the traditional auger. Besides, the results also show that there exists a"dead zone" in the traditional structure auger in which the particles are difficult to contact with other particles. It causes that the minimal value of standard deviation of the materials in the traditional structure auger is about 0.04 larger than that of the materials in multi-segment type auger. By comparison and quantitative analysis of filling degree at 4 sampling positions in fermentation bin, it is derived that the degree of filling at the inlet is approximately equal, but the orientation about the degree of filling will gradually decrease and finally reach a constant value of about 0.222 in the process of materials conveying of multi-segment type auger. The change of filling degree in multi-section auger is 38.1%, and the traditional structure auger fundamentally maintains a smooth trend. The transport efficiency of the multi-segment type auger is 20% higher than that of the traditional auger. It is verified that anti-clogging ability of multi-segment type auger is so strong that it is more suitable for the production of organic fertilizer. The result of prototype test is basically consistent with the result of discrete element analysis, and the design meets the requirements of organic fertilizer production. This study can provide reference for the design of organic fertilizer production equipment.关键词
肥料/机械化/设计/多段式搅龙/离散元法/混合均匀度/填充度Key words
fertilizer/mechanization/design/multi-segment type auger/discrete element method/degree of mixing/degree of filling分类
农业科技引用本文复制引用
张秀丽,刘云鹏,李连豪,仝振伟,杨丁元,侯朝朋..有机肥生产中的多段式搅龙设计与性能试验[J].农业工程学报,2018,34(3):49-56,8.基金项目
河南省科技攻关项目(172102110058) （172102110058）
河南省高等学校重点科研项目计划(16A416006) （16A416006）
河南省科技厅产学研项目(152107000085) （152107000085）
河南省科技开放合作计划项目(172106000015) （172106000015）
