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| Study on the influence of hopper half cone angle and particle size on coal particle discharge based on EDEM |
| DOU Jianqiang1，FU Ting1，DENG Xiaolei2，WANG Jiangbo1 |
| （1. School of Mechanical Automation, Wuhan University of Science and Technology, Wuhan 430081， China；
2. Key Laboratory of Aerodynamic Equipment Technology of Zhejiang Province, Quzhou University, Quzhou
324000, China） |
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Abstract In this paper, based on the influence of hopper structure on coal discharging in its interior, the flow
behavior of hopper with different semi cone angles on coal particle system was analyzed by using the discrete
element software EDEM. A hopper model with three diameters of pulverized coal particles and five half cone
angles was established, and the mapping relationship between the flow pattern of particles in the hopper and
the flow state of particles and the half cone angle of the hopper, as well as the mapping relationship between
the change of particle force, the half cone angle of the hopper and the particle diameter were simulated and
analyzed respectively. The results show that the semi cone angle of the hopper not only has an obvious effect
on the internal particle flow pattern, but also the particle flow state presents a local eddy current with the
increase of the semi cone angle. The particles with a diameter of 1mm can still maintain good flow uniformity
in the central flow pattern. The larger the particle size is, the more likely it is to appear obvious flow phenomena such as translation, oblique movement and cross in the discharge process. The increase of the hopper half
cone angle will make the particles have continuous fluctuating force changes when flowing. Slow particles
near the wall are more likely to move along the hopper in a curve shape in the form of local eddy current,
reducing the blanking efficiency and intensifying the uneven blanking during the discharging process.
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Received: 26 September 2022
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2023, Vol. 33 
