Numerical Simulation of NOx Emission from Plasma Ignition Boiler
Plasma ignition technology has been successfully applied in various types of coal-fired boilers,which greatly improves the ignition success rate and operation economy.NOx emission is an important issue in boiler operation,thus it is very meaningful to carry out the research on the characteristics of NOx emission in the plasma ignition boiler.Numerical simulation was used to study the combustion characteristics of the boiler under different plasma ignition powers,obtaining the flow field and temperature distribution in the boiler.By adopting three types of NOx generation mechanisms,the contribution ratios and trends of the three types of NOx under different ignition powers were obtained.The in-crease of plasma ignition power has a small effect on the flow field inside the furnace chamber,but it will obviously increase the average tem-perature inside the chamber and expand the range of high-temperature zone.With the increase of plasma ignition power,the fuel type NOx generation decreases,the thermal type NOx generation increases,and the total NOx generation decreases.
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