中储式制粉系统倒仓复合气力输送方案

Pneumatic conveyance scheme for intermediate coal pulverizing system

针对燃煤机组中储系统倒仓过程中的诸多问题,在现有技术基础上根据现场实际情况,设计了复合气力输送系统,充分利用制粉系统本身负压,对系统管内煤粉气流流动进行优化,又增设了增压风以及弯管部分的导叶,同时对煤粉分离设置进行优化。该方案实施后,降低了气固速度比、垂直管内混合比和弯管内煤粉气流混合比,减少了输送阻力,提高了分离效率,达到了减少人力资源占用,提高输送效率,改善现场工作环境,减少煤粉损失和粉尘爆炸风险的效果。

On the basis of the current technology and the field condition,the new pneumatic conveyance system was designed.By taking advantage of negative pressure in the system,the coal-air flow in the tube was optimized,the booster fan and guide blade at the elbows were installed,and the coal-air separating device was also optimized.After the optimization,the ratio of gas to particles＇ velocity,the coal-air mixture ratio in vertical pipe and elbows were reduced,the conveying resistance decreased and the separation efficiency increased.Therefore,the goals of speeding up the conveying efficiency,reducing the human work quantity and coal loss as well as risk of dust explosion were attained.