The Effects of CO2, N2, and H2O Dilutions on NO Formation of Partially Premixed Synthesis Gas Combustion
Abstract
One of the main methods to decrease NO emission during the combustion of gases is the use of diluents. This study is interested in the effects of CO2, N2, and H2O dilutions in the adiabatic, turbulent, partially premixed combustion of synthesis gas. The amounts of NO emissions are computationally determined. The results show that NO maximizes at 1.39 of equivalence ratio under humid burning air conditions. The best reductive effect on NO emissions indicates H2O dilution followed by CO2 and N2. The increase in the dilution rates gradationally reduces NO. The rising pressure enhances NO emissions with/without diluters. The increasing inlet air and premixed mixture temperatures raises NO.
Keywords
Synthesis gas, partially premixed, combustion, nitrogen oxide
References
- [1] Zhang Y., Shen W., Zhang H., Wu Y. and Lu J., Effects of Inert Dilution on The Propagation and Extinction of Lean Premixed Syngas/air Flames, Fuel, 157 (2015) 115–121.
- [2] Singh D., Nishiie T., Tanvir S. and Qiao L., An Experimental and Kinetic Study of Syngas/air Combustion at Elevated Temperatures and The Effect of Water Addition, Fuel, 94 (2012) 448–456.
- [3] Erik N. Y., Shale Gas and Environmental Effects, Cumhuriyet University Faculty of Science, Science Journal (CSJ), 37 (2016) 426–438.
- [4] Ozturk S. and Eyriboyun M., NOx Formation in Combustion of Natural Gases Used in Turkey under Different Conditions, J. of Thermal Science and Technology, 30-2 (2010) 95–102.
- [5] Li S., Li S., Mira D., Zhu M. and Jiang X., Investigation of Dilution Effects on Partially Premixed Swirling Syngas Flames Using a LES-LEM Approach, Journal of the Energy Institute, 91 (2018) 902–915.
- [6] Xie Y., Wang J., Xu N., Yu S. and Huang Z., Comparative Study on The Effect of CO2 and H2O Dilution on Laminar Burning Characteristics of CO/H2/Air Mixtures, International Journal of Hydrogen Energy, 39 (2014) 3450–3458.
- [7] Park S. and Kim Y., Effects of Nitrogen Dilution on The NOx Formation Characteristics of CH4/CO/H2 Syngas Counterflow Non-premixed Flames, International Journal of Hydrogen Energy, 42 (2017) 11945–11961.
- [8] Parka S., Choib G. M. and Tanahashi M., Combustion Characteristics of Syngas on Scaled Gas Turbine Combustor in Pressurized Condition: Pressure, H2/CO Ratio, and N2 Dilution of Fuel, Fuel Processing Technology, 175 (2018) 104–112.
- [9] Williams T. C., Shaddix C. R. and Schefer R. W., Effect of Syngas Composition and CO2-Diluted Oxygen on Performance of A Premixed Swirl-stabilized Combustor, Combust. Sci. and Tech., 180 (2008) 64–88.
- [10] Huang M., Zhang Z., Shao W., Xiong Y., Liu Y., Lei F. and Xiao Y., Effect of Air Preheat Temperature on The MILD Combustion of Syngas, Energy Conversion and Management, 86 (2014) 356–364.