Abstract
Thermal NO and fuel NO formation models with a second-order moment closure totreat the turbulence chemistry interaction are incorporated into the comprehensive modelfor simulating pulverized coal combustion. Simulation of three dimensional pulverized coalcombustion and NO formation has been made in a sudden-expansion combustor with highvelocity jets. The predicted results show that the values of thermal NO are smaller thanthat of fuel NO, the amounts of thermal NO produced is only about 2% of the total NO.Compared with the predicted results using the Arrhenius model, it can be seen that theNO concentration predicted by the Arrhenius model are larger than that predicted by thesecond-order moment turbulence chemistry model, so the turbulence effect is beneficial toreduce the NO forn1ation under the modeling condition in this combustor.
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