【摘要】 在输送压力可达3.6MPa,输送速率通量可达4600kg·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。更多还原

【Abstract】 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.更多还原