The investigation of the wet coal flow characteristics is carried out in a three-dimensional silo system by experiments and simulations. The effect of the moisture content on the flow characteristics is firstly investigated by experiments, which is in terms of bulk density, angle of repose, and flow rate at outlet. When moisture content is below 9%, the coal particles act as the easy flow mode. When moisture content exceeds 9.8%, the flow pattern turns to be cohesive. For the further understanding of the influence of the moisture content, we develop the continuum method with the effect of moisture content being considered in the mathematic model. The simulation results of the discharge rate and the ash content at outlet have good agreements with a maximum deviation of 7.3%. It is found that the Mixing Index decreases with the moisture content increasing because the moisture strengthens mixing among particles. And the velocity difference between particles in the central axis and ones near the wall grows accordingly. Particles with higher moisture content are easier to get the funnel flow mode. For particles with good flowability, the mass flow mode appears in the silo.

中文翻译：

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筒仓内湿煤流动特性的试验与模拟研究

通过实验和模拟在三维筒仓系统中进行湿煤流动特性的研究。首先通过实验研究水分含量对流动特性的影响，即体积密度、休止角和出口流量。当含水率低于 9% 时，煤粒作为易流动模式。当水分含量超过 9.8% 时，流型变得有凝聚力。为了进一步了解水分含量的影响，我们开发了连续统方法，在数学模型中考虑了水分含量的影响。出料量与出口灰分模拟结果吻合较好，最大偏差为7.3%。发现混合指数随着水分含量的增加而降低，因为水分加强了颗粒之间的混合。并且中心轴上的粒子与靠近壁的粒子之间的速度差相应地增大。含水量较高的颗粒更容易获得漏斗流模式。对于流动性好的颗粒，料仓中出现质量流模式。