Numerical Analysis of Particle Motion in Pneumatic Centralized Fertilizer Distribution Device Based on CFD-DEM

被引：0
作者：
Yang Q. [1 ,2 ]
Li Z. [1 ]
Li H. [1 ,2 ]
He J. [1 ,2 ]
Wang Q. [1 ,2 ]
Lu C. [1 ,2 ]
机构：
[1] College of Engineering, China Agricultural University, Beijing
[2] Cultivated Land Conservation Agricultural Science Observation and Experiment Station, Northern Hebei Province, Ministry of Agriculture and Rural Affairs, Beijing
来源：
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | 2019年 / 50卷 / 08期
关键词：
Fertilizer distribution device; Flow characteristics; Gas-solid coupling; Granular fertilizer; Pneumatic centralized;
D O I：
10.6041/j.issn.1000-1298.2019.08.009
中图分类号：
学科分类号：
摘要：
The increase of grain production is inseparable from fertilization. However, the side effects like energy waste, environment pollution and economic loss are largely caused by unreasonable fertilization. The characteristics of traditional fertilization machine are low operation speed, small fertilizer width and low efficiency, which also followed with unbalanced fertilization in each row, and a large amount of fertilizer is inefficiently utilized. Studies have shown that rational fertilization, especially mechanized precision proportionate fertilization can significantly improve the quality of agricultural products. In order to realize high-speed and wide-width fertilization operation, rapid quantitative transportation of granular fertilizers and proportionate fertilization in each row of the field fertilization machine, the pneumatic centralized fertilization seeder has become the main research and application machine. In order to study the movement characteristics of fertilizer particle in the pneumatic centralized fertilizer distribution device, the air-solid two-phase flow characteristics in the pneumatic centralized fertilizer distribution device were numerically analyzed by the coupled simulation of discrete element method (DEM) and computational fluid dynamics (CFD). In this coupling model, solid fertilizer particles were simulated by EDEM software and the air phase was operated by Fluent software. The optimum structure parameters of the fertilizer distribution device were determined by studying the effects of the cone angle of the screwing caps and the diameter of bellows on the air pressure, air velocity and motion characteristics of fertilizer particle. Based on this structure, the distribution uniformity of the fertilizer distribution device influenced by the inlet air velocity and fertilization velocity were studied. The simulation and test results showed that the air flow and the fertilizer particle had the best fluidity and uniformity in the fertilizer distribution device with the taper angle of the screwing caps of 120° and the diameter of the bellows of 80 mm. Under the conditions of 25~35 m/s inlet air velocity and 0.26~0.44 kg/s fertilization velocity, the coefficient of variation of fertilization amount on each row was not more than 4.9%. The distribution accuracy and uniformity of different kinds of fertilizers were also met the requirements of fertilization operation. © 2019, Chinese Society of Agricultural Machinery. All right reserved.
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页码：81 / 89
页数：8
相关论文
共 28 条
  • [1] Zhang F., Ma W., The relationship between fertilizer input level and nutrient use efficiency, Soil and Environmental Sciences, 9, 2, pp. 154-157, (2000)
  • [2] Tao Z., Zhou H., Wang T., Discussion on development of chemical fertilizer, Modern Agricultural Science and Technology, 20, pp. 182-183, (2018)
  • [3] Li X., Dai W., Gao H., Et al., Correlation between grain yield and fertilizer use based on back propagation neural network, Transactions of the Chinese Society for Agricultural Machinery, 48, pp. 186-192, (2017)
  • [4] Li W., Guo S., Liu H., Et al., Comprehensive environmental impacts of fertilizer application vary among different crops: implications for the adjustment of agricultural structure aimed to reduce fertilizer use, Agricultural Water Management, 210, pp. 1-10, (2018)
  • [5] Ning C., Gao P., Wang B., Et al., Impacts of chemical fertilizer reduction and organic amendments supplementation on soil nutrient enzyme activity and heavy metal content, Journal of Integrative Agriculture, 16, 8, pp. 1819-1831, (2017)
  • [6] Zhang F., Chen X., Ma W., Discussion on fertilizer in an era of modern agriculture, Phosphate &Compound Fertilizer, 18, 1, pp. 1-3, (2003)
  • [7] Fu Y., Yuan W., Zhang W., Et al., Present situation and problem analysis of the technology of fertilizer mechanization in China, Journal of Agricultural Mechanization Research, 39, 1, (2017)
  • [8] Yatskui A., Lemiere J.P., Cointault F., Influence of the divider head functioning conditions and geometry on the seed's distribution accuracy of the air-seeder, Biosystems Engineering, 161, pp. 120-134, (2017)
  • [9] Li J., Webb C., Pandiella S.S., Et al., Solids deposition in low-velocity slug flow pneumatic conveying, Chemical Engineering and Processing: Process Intensification, 44, 2, pp. 167-173, (2005)
  • [10] Kumar V.J.F., Durairaj C.D., Influence of head geometry on the distributive performance of air-assisted seed drills, Journal of Agricultural Engineering Research, 75, 1, pp. 81-95, (2000)
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