Direct ignition with plasma and cold air in pulverized coal boilers under oxygen-enriched atmosphere is believed as an excellent technology

which simplifies the air preheating during the cold start-up.With Fluent software

the characteristic of the ignition technology was numerically simulated.The calculation results showed that the pulverized coal in coal air can be ignited successfully by the plasma under oxygen-enriched atmosphere

and it had good adaptability to the coal.Comparison of the flow field

temperature field and gaseous component field under oxygenenriched cold air and warm air atmosphere

and investigation on the ignition characteristic under different oxygen concentration conditions confirmed that the oxygen-enriched atmosphere promoted the combustion reaction speed of pulverized coal

decreased the CO generation

increased the flame temperature

and enhanced the efficiency of pulverized coal combustion during ignition

which was helpful to reducing the energy from plasma.With an increase in the oxygen concentration

the plasma cold air ignition characteristic had an optimal value.For Jinbei bituminous coal

the increasing oxygen concentration had little influence on ignition effect when the it was larger than35%.