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.