AC plasma ejection gun, the method for supplying power to it and pulverized coal burner

An AC plasma ejection gun, comprising:

• a power supply device, having a live wire and a null wire, to supply power to the AC plasma ejection gun to generate arc uninterruptedly, the power supply device comprising:
• an AC main power source to supply power to the AC plasma ejection gun to produce the arc;
• an AC arc starting power source, an output of the AC arc starting power source on which a voltage-raising frequency process has been performed to be uninterruptedly loaded on the AC plasma ejection gun, and, when the AC main power source is passing a zero point, the AC arc starting power source on which the voltage-raising frequency process has been performed to continue to supply power to the AC plasma ejection gun to produce the arc;
• a first voltage-raising frequency circuit comprising:
• a first transformer to raise an output voltage of the AC arc starting power source to a first voltage;
• a first oscillating circuit comprising a secondary side of the first transformer and a first capacitor connected in parallel to raise an output frequency of the AC arc starting power source to a first frequency;
• and
• a tungsten electrode connected in parallel with the secondary side of the first transformer to release electric energy of the first oscillating circuit and to raise the output frequency of the AC arc starting power source;
• and
• a second voltage-raising frequency circuit comprising:
• a second transformer to raise the output voltage of the AC arc starting power source from the first voltage to a second voltage;
• and
• a second oscillating circuit comprising a secondary side of the second transformer and a second capacitor connected in parallel to raise the output frequency of the AC arc starting power source from the first frequency to a second frequency;
• an electric front electrode defining a front chamber, a nozzle connected with the front chamber at an outlet of the front electrode, an air inlet pipe connected with the front chamber at an inlet of the front electrode, the front electrode connected with the null wire;
• and
• an electric rear electrode, connected with the inlet of the front electrode by an insulated ring, a gap between the electric rear electrode and the front electrode, the rear electrode being connected with the live wire, a spinning air inlet ring at an outside of the gap between the electric front electrode and the rear electrode, compressed air from the air inlet pipe to pass the spinning air inlet ring and to enter into the front chamber;
• wherein,
• an arc between the front electrode and the rear electrode is to discharge, ionizing the compressed air into plasma in the gap between the front electrode and the rear electrode, and the plasma is to be ejected out of the nozzle from the front chamber.