煤粉罐车卸料速度影响因素研究

Influencing factors of pneumatic conveying efficiency of coal powder tank car

为解决工程实践中煤粉罐车向煤粉塔气力送粉时间过长的问题,对输送阻力进行了计算,并对煤粉罐车的卸料速度影响因素进行了分析。结果表明:上粉管的压力损失由两相流摩擦压损、煤粉颗粒重力压损以及煤粉颗粒加速动力压损3部分构成。当煤粉塔高度由23 m变为28 m时,同样输送20 t煤粉所需时间由50.0 min延长到58.5 min,延长了17%,若保证输送时间不变,则输送管内径应由100 mm增至106 mm,此数据与实际仍有较大偏差,这是由于管道内存在其他阻力因素或煤粉水分较高导致。因此,为保证良好的输送效果,建议采用锅炉房或厂区内的洁净干燥压缩空气作为上粉输送气体。

To minimize the conveying time from coal powder tanker to tower,calculated the resistance during conveying. Analyzed the influencing factors of unloading speed of coal powder tank car. The results show that,the pressure loss of conveying pipe consists of two-phase flow friction pressure loss,coal powder gravity pressure loss and accelerated dynamic pressure loss. When the height of silo increases from23 m to 28 m,the conveying time of 20 tons coal powder delays from 50 min to 58. 5 min,by 17%. Keep the conveying time unchanging,the inner diameter of pipe should increase from 100 mm to 106 mm which is different from the actual situation. The possible reasons are resistance of pipe or high moisture of coal powder. To guarantee the better conveying effects,the clean,dry and compressed air in boiler room or plant should be used as powder conveying gas.