非平衡激振变椭圆等厚筛分动力学与机理研究

Screening is a key unit in the processing and utilization of clean coal. There are some problems, such as materials accumulation, low utilization ratio of screen surface and poor screening performance during traditional balanced-excitation equal-amplitude screening with single screen inclination angle, which significantly affect the upgrading process of coal. In this project, the variable-ellipse equal-thickness screening method with unbalanced-excitation is proposed to solve the above problems. The research is carried out by means of combining theoretical modeling, numerical simulation, test analysis and screening experiment. Firstly, the dynamic model of self-synchronous variable-ellipse equal-thickness screen with unbalanced-excitation is established. The synchronization conditions and stability criteria are given. The kinematic characteristics of the screen surface are clarified and the spatial trajectories of different areas of the screen surface are reconstructed. Secondly, the energy transfer law between screen surface and particle system during the variable-ellipse equal-thickness screening is studied. The movement behavior characteristics of materials, the evolution process of the temporal and spatial distribution of material layer on the screen surface and penetration distribution law of various size fraction materials are clarified. The mechanism of unbalanced-excitation variable-ellipse equal-thickness screening is revealed. Thirdly, the synergistic mechanism of unbalanced-excitation parameters during variable-ellipse equal-thickness screening process is explored. The correlation model between screening efficiency of coal and unbalanced-excitation parameters is established. A collaborative optimization method of variable-ellipse equal-thickness screening process is put forward, which is suitable for material characteristics. The research findings will enrich the theory of equal-thickness screening, and provide theoretical support for the development and application of unbalanced-excitation variable-ellipse equal-thickness screen.

筛分是煤炭清洁加工利用的关键环节，传统单一倾角平衡激振等振幅筛分过程中存在粒群堆积、筛面利用率低、筛分效果差等问题，严重影响了煤炭的提质加工。本项目提出非平衡激振变椭圆等厚筛分方法，采用理论建模、数值模拟、测试分析和筛分试验相结合的研究手段，开展以下研究：建立非平衡激振自同步变椭圆等厚筛动力学方程，给出同步条件及稳定性判据，阐明筛面的运动学特性，重构筛面不同区域的空间运动轨迹；研究变椭圆等厚筛分过程中筛面与颗粒体系的能量传递规律，阐明粒群的运动行为特征、筛上料层的时空分布演变过程及各粒级物料的透筛分布规律，揭示非平衡激振变椭圆等厚筛分机理；探索变椭圆等厚筛分过程中非平衡激振参数间的协同作用机制，建立筛分效率与非平衡激振参数之间的关联模型，提出与物料特性相适配的变椭圆等厚筛分过程协同优化方法。研究成果将丰富等厚筛分理论，为非平衡激振变椭圆等厚筛的研发及应用提供理论支撑。

筛分是煤炭分选加工的关键环节。本项目针对传统平衡激振等振幅筛分过程难题，提出了非平衡激振变椭圆等厚筛分方法，建立了非平衡激振自同步变椭圆等厚筛动力学方程，给出了同步条件及稳定性判据；阐明了筛面运动学特性、粒群运动行为特征与透筛分布规律，揭示了变椭圆等厚筛分机理；探究了筛分过程中非平衡激振参数间的协同作用机制，建立了筛分效率与非平衡激振参数之间的关联模型，提出了变椭圆等厚筛分过程协同优化方法，实现了煤炭高效大规模细粒筛分，丰富了等厚筛分理论，研发的筛分技术装备在国家能源集团等应用。.发表论文18篇，其中SCI论文17篇；授权发明专利4项，在申请发明专利12项；培养研究生3名；获教育部科技进步特等奖1项、中国黄金协会科技一等奖1项、中国专利优秀奖1项、中国煤炭工业科学技术二等奖1项，成果入选中国高等学校十大科技进展。获孙越崎青年科技奖、绿色矿山青年科技奖，入选中国科协青年人才托举工程。