ABSTRACT

Water velocity and bed density are most important operating variables affecting the separation of coal particles in Teeter Bed Separator (TBS). In this paper, experimental investigation is carried out to evaluate the matching effect of operating variables on the performance of TBS for separating a coal sample with size of 1–0.25 mm. Furthermore, the particle motion based on the Euler-Euler simulation approach and slip velocity model is analyzed to explain the experiment phenomenon. Experiment results show that at a constant cut density (δ₅₀), two operating variables present a negative relationship. When a considerable clean coal yield is produced, the matching of a lower water velocity with higher bed density displays more desirable performance. The performance difference at different matching operation is also reflected in the separation of narrow size particles. The simulation results and theoretical analysis on particle motion illustrate that coal particles are separated more significantly according to their density at the operating condition of lower water velocity matching higher bed density. The study is of great importance to offer the reference of operating variables controlling and develop numerical simulation study for TBS.

摘要

水流速度和床层密度是影响摇摆床分离器 (TBS) 中煤颗粒分离的最重要的操作变量。在本文中，进行了实验研究，以评估操作变量对 TBS 分离 1-0.25 mm 煤样性能的匹配效果。此外，基于欧拉-欧拉模拟方法和滑移速度模型分析了质点运动，以解释实验现象。实验结果表明，在恒定切割密度（δ ₅₀)，两个运行变量呈现负相关关系。当产生可观的清洁煤产量时，较低水速与较高床密度的匹配显示出更理想的性能。不同匹配操作下的性能差异也体现在窄尺寸颗粒的分离上。颗粒运动的模拟结果和理论分析表明，在较低水速匹配较高层密度的运行条件下，煤颗粒根据其密度分离更明显。该研究为TBS的运行变量控制和开展数值模拟研究提供参考具有重要意义。