Before the system starting up, it needs the whole system filled with nitrogen gas until the oxygen analyzer AT21 instructing the oxygen volume fraction is less than 4%. This process is usually done manually. Due to the materials to be delivered are flammable medium, if its oxygen content is very high,it will cause materials friction burst into flames in the pipeline. Oxygen index after normal instructions,the operator will select the transmission path on the operation site in the controlling room, namely the selection of feeding hopper, rotary feeder, compressor and target bunker. After selection, the selected compressor¡¯s oulet and inlet valve V24A or B, V25A or B, open the compressor bypass valve, open V28, rotary feeder V21A or B ,open at the bottom of the valve, three-way valve V22 point to the selected bin, nitrogen backflow preventer V23A open or B. The above actions are done automatically by the program. At this point, the system¡¯s startup preparatory work has been completed. The operators in the operating site after issuing the startup instruction, the start steps are: start the compressor; close the bypass valve, the system pre-venting for a certain period; start the rotating feeder, start conveying the material, the system startup is completed.