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Improved dust capture methods for crushing plant

机译：改进的破碎设备集尘方法

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The use of compressive crushing equipment such as gyratory crushers within minerals processing plants can potentially generate large quantities of dust. Remedies to this problem include the retrofitting of shrouds, enclosures, local exhaust ventilation (LEV) systems and water suppression systems. The single or combined application of these systems must be optimised to ensure they operate efficiently. It is desirable that the future design planning of such facilities include integrated dust suppression and/or removal systems to ensure material delivery rates are maintained and the welfare of the workforce is protected. The tipping of mineral ore into the crusher feed bin is investigated by the construction and solution of computational fluid dynamic (CFD) models validated by data obtained from scale experiments. A 3D computational model was constructed using the Fluent™ CFD software to represent the background ventilation regime within an underground crushing installation. The falling ore is represented as a continuum granular fluid falling under gravity from the raised bed of the dump truck. Transient path lines are computed to simulate the updraft airflow generated by the tipping process and indicate the dispersion path of any entrained dust. The relationships between the falling ore material, the displaced air and the shear induced flow are determined by an analysis of the computed volume/mass flow rates predicted across the crusher opening. A parametric study has been performed on the model of the tipping process to investigate the influence on dust dispersion of; the orientation of the dump truck, the surrounding ventilation characteristics and the material tipping rate, volume and initial fill level of the crusher bin. The operation of LEV systems has also been simulated to identify the influence of such systems on the airflow characteristics in and around the crusher feed bin. An analysis of the airflow patterns predicted by the CFD simulation models indicates strong shear flows induced between the tipped material and the surrounding airflow in the vicinity of the crusher during tipping, and a strong influence of the background ventilation regime on the path taken by this shear flow. Scale experimental studies were conducted to characterise the induced shear flow and visualise the potential entrainment and transport of dust. An analysis of these preliminary experiments is presented.
机译：在矿物加工厂中使用压缩破碎设备（例如回转破碎机）可能会产生大量粉尘。解决此问题的方法包括加装护罩，外壳，局部排气通风（LEV）系统和水抑制系统。必须优化这些系统的单个或组合应用程序，以确保它们有效地运行。理想的是，此类设施的未来设计规划应包括集成的抑尘和/或除尘系统，以确保维持材料的输送速度并保护员工的福利。通过构造流体流体动力学（CFD）模型的构建和求解，研究了矿物矿石向破碎机进料仓的倾卸情况，该模型通过规模实验获得的数据得到验证。使用Fluent™CFD软件构建了3D计算模型，以表示地下破碎设施内的背景通风状况。下落的矿石表示为自卸卡车的升高床在重力作用下掉落的连续颗粒流体。计算瞬态路径线以模拟由倾斜过程产生的上升气流，并指示任何夹带灰尘的扩散路径。下落的矿石材料，置换的空气和剪切引起的流量之间的关系是通过对整个破碎机开口处预测的计算出的体积/质量流率的分析来确定的。对倾翻过程的模型进行了参数研究，以研究其对粉尘扩散的影响。自卸车的方向，周围的通风特性以及碎石仓的物料倾卸率，体积和初始填充水平。还已对LEV系统的运行进行了模拟，以识别此类系统对破碎机进料仓内和周围气流特性的影响。通过CFD模拟模型预测的气流模式的分析表明，倾翻过程中，倾斜材料在破碎机附近与周围气流之间产生了强烈的剪切流，并且背景通风方式对该剪切所采取的路径产生了强烈影响流。进行了规模实验研究，以表征诱导的剪切流，并可视化粉尘的潜在夹带和传输。提供了对这些初步实验的分析。

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