不同煤粉高压密相气力输送特性实验研究

在输送压力可达3.6 MPa，输送速率通量可达4 600 kg×s-1×m-2的气力输送中试实验台上，进行3种煤粉(内蒙、大同和兖州煤粉)、同一煤种(内蒙煤粉)不同粒径的高压密相气力输送的系统实验研究。考察输送压力、总输送差压、流化风流量、煤粉粒径和煤粉种类等因素对输送特性的影响。研究结果表明，高压条件更有利于实现较高固相速率通量的低速密相输送；输送速率通量随着流化风流量的增大而先略增后略降；系统的输送能力随着煤粉粒径和水分的增大而降低，且水分的影响更大；不同管段的压降呈现不同的特征，说明管段的布置影响流动阻力和稳定性；煤粉颗粒大小和固气比均是影响压降特征的重要因素。

Experimental Study on the Characteristics of High-pressure and Dense-phase Pneumatic Conveying of Different Pulverized Coal

Experiments were conducted for three sizes, different particle size pulversized coal on an experimental setup at the pressure up to 3.6 MPa and the solid flux up to 4 600 kg×s-1×m-2. Influences on the conveying characteristics of conveying pressure, total conveying differential pressure, fluidizing gas flow rate, category of pulverized coal and particle sizes, were investigated respectively. The results show that high-pressure pneumatic conveying is better for low-velocity and dense-phase conveying of pulverized coal at high solid flux; solid flux increases slightly with fluidizing gas flow rate at first and then decreases a bit; conveying capacity degrades with the increase in particle size and moisture content of pulverized coal, and the effect of the moisture content is more significant; different characteristics of pressure drop at different section indicates that the pipeline layout effects flow resistance and stability; particle size and solid-gas ratio are also important factors influencing characteristics of pressure drop.