Investigation of no emission in a heat recovery steam generator boiler using computational fluid dynamics

Subject Areas :

عباس خوشحال ¹ ( استادیار مهندسی شیمی، گروه مهندسی شیمی، دانشگاه پیام نور، تهران، ایران )
حمید یزدانی ² ( استادیار مهندسی پلیمر، گروه مهندسی شیمی، دانشگاه پیام نور، تهران، ایران )

Received: 2017-07-15 Accepted : 2017-12-15 Published : 2018-11-22

Keywords: Modeling, Computational Fluid Dynamics, NO emission, HRSG boiler, Equivalence ratio,

Abstract :

In this study, NO emission in a HRSG boiler was investigated using CFD. The comparison between the predicted results and measured values showed good agreement, which implied that the adopted combustion and NO formation models are suitable for predicting the characteristics of the flow, combustion, and NO emission in the boiler. The predicted results showed that the NO formation in the HRSG boiler is quite sensitive to fluid flow, temperature, and oxygen concentration distributions. In addition, the influence of the equivalence ratio at a fixed air mass flow rate on the flame temperature and NO formation was investigated. The results revealed that with increasing the equivalence ratio in the fuel-lean condition, higher flame temperatures established in the boiler and more NO formed. However, in the fuel-rich condition, increasing the equivalence ratio at a fixed air mass flow rate caused a decreasing trend in flame temperature and the NO formation. The maximum flame temperature and NO formation are found at the stoichiometric condition

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