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Control of nitrogen oxide formation in power generation using modified reaction kinetics and mixing

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  • Bashtani, Javad
  • Seddighi, Sadegh
  • Bahrabadi-Jovein, Iman

Abstract

This work presents a new method for reducing the formation of nitrogen oxide (NOx) emission in power generation by varying the dominating NOx formation reaction mechanism. A burner secondary oxidizer (BSO) injection is introduced in which a part of the required oxidizer for the reactions is distributed in a way to selectively increase the reactant radicals in an extended flame region. The modeling is validated using experimental results in a 300 kW furnace with a non-premixed natural gas burner. While the NOx emission level is the focus of this work, the effects of this new design on the flow streamlines and the fields of temperature and velocity are studied. The results show that the optimum case with minimum outgoing NOx is the case with 25% BSO ratio associated with burner primary oxidizer equivalence ratio of 1.22. This optimum condition leads to 66% reduction of NOx with only 8 ppm of outgoing NOx. The combustion in the furnace for the case with 25% BSO reduces the NOx formation mainly due to generating a larger fuel-rich area close to the burner compared to the typical burners leading to the change of the dominating NOx formation from Zeldovich mechanism to prompt NOx mechanism.

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  • Bashtani, Javad & Seddighi, Sadegh & Bahrabadi-Jovein, Iman, 2018. "Control of nitrogen oxide formation in power generation using modified reaction kinetics and mixing," Energy, Elsevier, vol. 145(C), pages 567-581.
    • Handle: RePEc:eee:energy:v:145:y:2018:i:c:p:567-581
    DOI: 10.1016/j.energy.2017.12.143
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