In this research, effect of steam injection in pulverized coal combustion to reduce pollutants such as , , and in a 2D combustion chamber have been studied. A numerical method which incorporates pressure base algorithm and implicit solver has been employed to simulate non-premix combustion model. The air was diluted by steam, whose percentages varied from 0% to 20%. Steam and air were preheated by a high-temperature gas generator, and the preheated oxidizer temperature could achieve . Numerical simulations were also carried out to provide more information about fluid field. The combustion simulation with the generalized finite rate chemistry model, referred to as the Magnusson model and the reacting flow with the mixture fraction PDF/equilibrium chemistry model, referred to as the PDF model are studied. As a result of addition steam into oxidizer, adiabatic flame temperature and rate of pollutants decreases.

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