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Experimental Study on Fluidization Behaviors of Wet Rice Threshed Materials with Hot Airflow

Author

Listed:
  • Tao Zhang

    (Key Laboratory of Modern Agricultural Equipment and Technology, Jiangsu University, Zhenjiang 212013, China
    School of Agricultural Engineering, Jiangsu University, Zhenjiang 212013, China)

  • Yaoming Li

    (Key Laboratory of Modern Agricultural Equipment and Technology, Jiangsu University, Zhenjiang 212013, China
    School of Agricultural Engineering, Jiangsu University, Zhenjiang 212013, China)

  • Lizhang Xu

    (Key Laboratory of Modern Agricultural Equipment and Technology, Jiangsu University, Zhenjiang 212013, China
    School of Agricultural Engineering, Jiangsu University, Zhenjiang 212013, China)

  • Yanbin Liu

    (Key Laboratory of Modern Agricultural Equipment and Technology, Jiangsu University, Zhenjiang 212013, China
    School of Agricultural Engineering, Jiangsu University, Zhenjiang 212013, China)

  • Kuizhou Ji

    (Key Laboratory of Modern Agricultural Equipment and Technology, Jiangsu University, Zhenjiang 212013, China
    School of Agricultural Engineering, Jiangsu University, Zhenjiang 212013, China)

  • Sheng Jiang

    (Key Laboratory of Modern Agricultural Equipment and Technology, Jiangsu University, Zhenjiang 212013, China
    School of Agricultural Engineering, Jiangsu University, Zhenjiang 212013, China)

Abstract

Among food crops, rice has the largest planting area, the highest yield per unit area and the largest total yield in China. However, cleaning performance is reduced by the high moisture content of rice during the harvesting process. In order to decrease the adhesion among wet rice threshed mixtures and improve the cleaning performance, the method of hot airflow cleaning was proposed. Firstly, the fluidization characteristics of wet sticky rice under the action of hot air were compared with those of dry particles. In this work, the minimum suspension velocity and the fastest suspension time were used and quantified to characterize the fluidization characteristics. It was found that the minimum suspension velocity and the fastest suspension time of the wet rice threshed mixture are both higher than those of dry particles due to the liquid bridge force. Moreover, the dispersion degree of the wet rice threshed mixture can be improved by the hot airflow due to the decrease in the surface water content of impurities. Secondly, the influence of the temperature and vibration frequency in the air-and-screen cleaning device on the dispersion characteristics of the wet rice threshed mixture were investigated. The accumulation mass was measured to quantify the dispersion degree. It was found that the increase in vibration frequency has little effect on the dispersion of the wet rice threshed mixture. The accumulation mass on the front of the sieve decreases slightly with the increase in the gas temperature range from ambient temperature to 30 °C. Then, the dispersion degree increases rapidly when the temperature exceeds 40 °C. The dispersion effect is the best when the temperature is 50 °C and the vibration frequency is 5 Hz. These results provide a basis for the cleaning of the wet rice threshed mixture in a combine harvester.

Suggested Citation

  • Tao Zhang & Yaoming Li & Lizhang Xu & Yanbin Liu & Kuizhou Ji & Sheng Jiang, 2022. "Experimental Study on Fluidization Behaviors of Wet Rice Threshed Materials with Hot Airflow," Agriculture, MDPI, vol. 12(5), pages 1-13, April.
  • Handle: RePEc:gam:jagris:v:12:y:2022:i:5:p:601-:d:801316
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    References listed on IDEAS

    as
    1. Yanbin Liu & Yaoming Li & Lipeng Chen & Tao Zhang & Zhenwei Liang & Mingsen Huang & Zhan Su, 2021. "Study on Performance of Concentric Threshing Device with Multi-Threshing Gaps for Rice Combines," Agriculture, MDPI, vol. 11(10), pages 1-15, October.
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