Study on Mechanism of Air-Floating Separation for Residual Film and Seed Cotton

Gaili Gao, Yinhui Feng, Yongxian He

Ekoloji, 2018, Issue 106, Pages: 579-589, Article No: e106062

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Abstract

Xinjiang is the main planting area of cotton in China. The frost-free period in this area is short and the annual rainfall is less-than 200 mm. Wide-film cotton planting technology is widely used. The filming rate of cotton field is almost 100%, about 60000 to 80000 tons of broken residual films are newly produced every year, and has caused serious pollution in farmland. Mechanized harvesting has a large amount of residual films in seed cotton, which affects not only the quality of seed cotton, but that of ginned cotton. In this paper, aiming at the key technical problem of removing cotton contaminant, i.e., residual film, a novel model is created. It is the first time to propose that the seed cotton is tore into a movable ‘wave-pattern’ thin layer by blowing air so that the residual film is fully exposed and then cleared by a suction-cleaner. To acquire such a seed cotton layer, upward airflows that flow in the ‘wave-pattern’ are added to a separation chamber transversely in the model, and airflows that can carry the seed cotton forward are added to the chamber longitudinally. First, the airflow distribution characteristics in the separation chamber are analyzed within a 2D model. The experiment shows that the airflow field is divided into three areas, the bottom area is diffusion zone of the airflow from airflow-holes on a hole-plate, where the airflow velocity is high, unstable and attenuate quickly, and the airflow field is mainly influenced by the airflow velocities at airflow-holes and its dip angle; the airflow field in the middle area is more stable and the airflow velocity is obviously lower than that in the bottom area, and the airflow direction is mainly affected by the dip angles of walls of cotton-inlet and cotton-outlet; and the airflow in the upper area has relatively high velocity due to the suction-cleaner. Therefore, the seed cotton should run in the middle area of airflow field. By further analyzing the orthogonal experiment results, the optimized values of three key geometric parameters are gained, that is, the height of separation chamber is 1.40m, the dip angle of walls of cotton-inlet and cotton-outlet is 80.00°, and that of airflow-holes on the hole-plate is 8.00°. Second, the airflow field characteristics are analyzed in the 3D flow field to acquire the velocities of ‘wave-pattern’ airflow. The results show that in order for the airflow velocity to stay in the range of 1.20-3.00m/s in the middle area of airflow field, the range of airflow velocity at the inlet of each row of airflow-hole on the hole-plate should be 8.00-14.00 m/s.

Keywords

air-floating separation, seed cotton, residual film, remove

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