Effect of steam injection in pulverized coal combustion to reduce pollutants

فاقد چكيده

In this research, effect of steam injection in pulverized coal combustion to reduce pollutants such as NOx , CO, 2 CO and C 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 1400° c . 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 Magnussen 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.