| 带式烘干机中水产饲料料层厚度对其表面风速场分布的影响 |
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| 引用本文： | 张鹏飞,吴鹏鹏,张琦,陈博,奚小波,张剑峰,张瑞宏.带式烘干机中水产饲料料层厚度对其表面风速场分布的影响[J].农业工程学报,2019,35(7):288-294. |
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| 作者姓名： | 张鹏飞 吴鹏鹏 张琦 陈博 奚小波 张剑峰 张瑞宏 |
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| 作者单位： | 1.扬州大学机械工程学院，扬州 225127; 2. 国家饲料加工装备工程技术研究中心，江苏牧羊控股有限公司，扬州 225120;,1.扬州大学机械工程学院，扬州 225127;,1.扬州大学机械工程学院，扬州 225127;,2. 国家饲料加工装备工程技术研究中心，江苏牧羊控股有限公司，扬州 225120;,1.扬州大学机械工程学院，扬州 225127;,1.扬州大学机械工程学院，扬州 225127;,1.扬州大学机械工程学院，扬州 225127; |
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| 基金项目： | 国家重点研发计划（2018YFF0214603, 2018YFD0700203-3）；江苏省科技项目现代农业项目（BE2018360）；产学研市校合作项目YZ2018133，YZ2018157） |
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| 摘 要： | 水产饲料在生产过程中经过膨化处理之后的含水率过高,需要进行烘干处理。在饲料烘干过程中,饲料层的厚度是一个重要的参数。料层厚度一方面代表烘干机单位时间内的产能(厚度越大,产能越高),影响烘干机的工作能耗;另一方面,料层厚度影响烘干机中的气流分布,从而对料层表面的风速分布的均匀性产生影响。该文研究料层厚度的变化对料层表面风速分布的影响。首先运用计算流体力学(computationalfluiddynamics,CFD)对3种料层厚度下(20、30、40mm)的烘干机的内部气流分布进行模拟仿真。然后基于实际生产,设计并制造烘干机对3种料层厚度下的烘干机内部气流进行试验验证,并在料层表面9个点利用风速传感器测出风速值,将风速模拟值与试验值进行对比分析。研究结果表明,风速模拟值的分布趋势与风速试验值的分布趋势均一致,且料层厚度的变化影响着烘干机内部的气流分布。当料层厚度为20 mm时,料层表面风速场较不均匀,当料层厚度为40mm时,料层表面的风速分布均匀性较好。该文所做研究为带式烘干机在实际生产中饲料层厚度参数的选择提供了理论指导,降低饲料水分的同时,保持良好的水分均匀性。
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| 关 键 词： | 烘干机 计算流体力学 风 气流 水产饲料 料层厚度 风速分布 |
| 收稿时间： | 2018/10/26 0:00:00 |
| 修稿时间： | 2019/3/6 0:00:00 |
Effects of aquatic feed layer thickness on distribution of airflow velocity on feed layer surface in belt dryer |
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| Zhang Pengfei,Wu Pengpeng,Zhang Qi,Chen Bo,Xi Xiaobo,Zhang Jianfeng and Zhang Ruihong.Effects of aquatic feed layer thickness on distribution of airflow velocity on feed layer surface in belt dryer[J].Transactions of the Chinese Society of Agricultural Engineering,2019,35(7):288-294. |
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| Authors: | Zhang Pengfei Wu Pengpeng Zhang Qi Chen Bo Xi Xiaobo Zhang Jianfeng and Zhang Ruihong |
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| Institution: | 1. College of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China; 2. National Feed Processing Equipment Engineering Technology Research Center, Jiangsu Muyang Holdings Co., Ltd., Yangzhou 225120, China;,1. College of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China;,1. College of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China;,2. National Feed Processing Equipment Engineering Technology Research Center, Jiangsu Muyang Holdings Co., Ltd., Yangzhou 225120, China;,1. College of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China;,1. College of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China; and 1. College of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China; |
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| Abstract: | Moisture content of the aquatic feed after extruder is frequently high in the production process, and drying is necessary to reduce moisture content of the aquatic feed. The thickness of feed layer is an important parameter during the aquatic feed drying. On one hand, the thickness of feed layer represents the capacity of the belt dryer per unit time(the thicker the feed layer, the higher the productivity), which affects the working energy consumption of the belt dryer. On the other hand, the thickness of feed layer also affects airflow distribution inside the belt dryer, thus affecting the distribution uniformity of airflow velocity on the surface of feed layer. The airflow velocity on feed layer surface directly influences the moisture content of aquatic feed after drying, and the uniformity of airflow velocity on feed layer surface directly influences the uniformity of moisture content of aquatic feed. In this paper, effects of aquatic feed layer thickness on airflow distribution in belt dryer and airflow velocity distribution on feed layer surface was studied. Firstly, three different kinds of internal airflow distribution inside the belt dryer were simulated using computational fluid dynamics (CFD), corresponding to three kinds of feed layer thicknesses (20, 30, 40 mm). Secondly, a belt dryer was designed and manufactured as the experimental platform based on the actual production needs in the National Feed Processing Equipment Engineering and Research Center. Thirdly, three series of experiments were conducted using the experimental platform corresponding to three kinds of feed layer thickness (20, 30, 40 mm), and repeated three times in every series of the experiment. Before the experiment, nine airflow velocity sensors were placed at nine points on the surface of the feed layer in order to measure the airflow velocity values of that nine points during the experiment. After the simulations and experiments, not only the simulation results of the airflow velocity distribution on the feed layer surface and experimental results of that were compared, but also the difference of airflow velocity distribution on feed surface between different feed layer thickness were compared. Results showed that the trend of airflow velocity distribution in simulation results and experimental results were consistent, which proved the simulations and experiments in this paper were reliable. Besides, the error between simulations and experimental results were also explained in this paper. According to the simulation and experimental results, aquatic feed layer thickness affected the airflow distribution inside the belt dryer and the airflow velocity distribution on the feed layer surface. When the feed layer thickness was 20 mm, the airflow velocity uniformity of airflow velocity distribution was not good. But when the feed layer thickness was 40 mm, airflow velocity uniformity of airflow velocity distribution was respectively good. The research in this paper provides theoretical guidance for the selection of feed layer thickness parameters in actual production of belt dryers, which can reduce the moisture content of aquatic feed and make the moisture content uniformity of aquatic feed good after drying. |
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| Keywords: | dryer computational fluid dynamics wind airflow aquatic feed feed layer thickness airflow velocity distribution |
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