CFD Modeling of Reduction in NOX Emission Using HiTAC Technique
In the present study, the rate of NOx emission in a
combustion chamber working in conventional combustion and High
Temperature Air Combustion (HiTAC) system are examined using
CFD modeling. The effect of peak temperature, combustion air
temperature and oxygen concentration on NOx emission rate was
undertaken. Results show that in a fixed oxygen concentration,
increasing the preheated air temperature will increase the peak
temperature and NOx emission rate. In addition, it was observed that
the reduction of the oxygen concentration in the fixed preheated air
temperature decreases the peak temperature and NOx emission rate.
On the other hand, the results show that increase of preheated air
temperature at various oxygen concentrations increases the NOx
emission rate. However, the rate of increase in HiTAC conditions is
quite lower than the conventional combustion. The modeling results
show that the NOx emission rate in HiTAC combustion is 133% less
than that of the conventional combustion.
[1] R. Tanaka and T. Hasegawa, "Innovative technology to change flame
characteristics with highly preheated air combustion," in 1997 Proc.
Japanese Flame Days, Osaka, Japan, pp. 129-150.
[2] A.K. Gupta, "High Temperature Air Combustion: Energy savings,
Pollution reduction and Fuel reforming," in Proc. 5th Mediterranean
Symposium on Combustion, the Combustion Institute, Monastir,
Tunisia, 2007.
[3] S.R. Wu, W.C. Chang and J. Chiao, "Low NOx heavy fuel oil
combustion with high temperature air," Fuel, vol. 86, no. 5-6, pp. 820-
828, April 2007.
[4] Q. Lu, J. Zhu, T. Niu, G. Song and Y. Na, "Pulverized coal combustion
and NOx emissions in high temperature air from circulating fluidized
bed," Fuel Process. Technol., vol. 89, no. 11, pp. 1186-1192, Nov. 2008.
[5] S. Li, T. Xu, S. Hui and X. Wei, "NOx emission and thermal efficiency
of a 300 MWe utility boiler retrofitted by air staging," Appl. Energ., vol.
86, no. 9, pp. 1797-1803, Sep. 2009.
[6] G. L. Borman and K. W. Ragland, "Combustion Engineering," New
York: McGraw-Hill, 1998, pp. 216-221.
[7] A.K. Gupta and Z. Li, "Effect of fuel property on the structure of highly
preheated air flames," J. Energ. Resour-ASME, vol. 5, pp. 247-257, June
1997.
[8] T. Hasegawa, S. Mochida and A. Gupta, "Development of advanced
industrial furnace using highly preheated combustion air," J. Propul.
Power, vol. 18, no. 2, pp. 233-239, Aug. 2002.
[9] A. Kokkinos, D. Wasyluk, D. Adams, R. Yavorsky and M. Brower,
"B&W-s experience reducing NOx emissions in tangentially-fired
boilers," The US EPA/DOE/EPRI combined power plant air pollutant
control symposium, the mega symposium, Chicago, Illinois, USA,
August 20-23, 2001.
[10] A. Frassoldati, S. Firgerio, E. Colombo, F. Inzoli and T. Faravelli,
"Determination of NOx emissions from strong swirling confined flames
with an integrated CFD-based procedure," Chem. Eng. Sci., vol. 60. no.
11, pp. 2851-2869, June 2005.
[11] Fluent Inc, Fluent 6.2 User's Guide, 2005.
[12] R. Siegel and J.R. Howell, "Thermal Radiation Heat," Transfer 3rd ed.
Hemisphere Publishing Corporation, Washington, 1992.
[13] B.E. Launder and D.B. Spalding, "The numerical computation of
turbulent flows," Comp. Meth. Appl. Mech. Eng., vol. 3, no. 2, pp. 269-
289, March 1974.
[14] D.L. Baulch, D.D. Drysdall and D.G. Horne, "Evaluated Kinetic Data
for High Temperature Reactions," Butterworth, 1973.
[1] R. Tanaka and T. Hasegawa, "Innovative technology to change flame
characteristics with highly preheated air combustion," in 1997 Proc.
Japanese Flame Days, Osaka, Japan, pp. 129-150.
[2] A.K. Gupta, "High Temperature Air Combustion: Energy savings,
Pollution reduction and Fuel reforming," in Proc. 5th Mediterranean
Symposium on Combustion, the Combustion Institute, Monastir,
Tunisia, 2007.
[3] S.R. Wu, W.C. Chang and J. Chiao, "Low NOx heavy fuel oil
combustion with high temperature air," Fuel, vol. 86, no. 5-6, pp. 820-
828, April 2007.
[4] Q. Lu, J. Zhu, T. Niu, G. Song and Y. Na, "Pulverized coal combustion
and NOx emissions in high temperature air from circulating fluidized
bed," Fuel Process. Technol., vol. 89, no. 11, pp. 1186-1192, Nov. 2008.
[5] S. Li, T. Xu, S. Hui and X. Wei, "NOx emission and thermal efficiency
of a 300 MWe utility boiler retrofitted by air staging," Appl. Energ., vol.
86, no. 9, pp. 1797-1803, Sep. 2009.
[6] G. L. Borman and K. W. Ragland, "Combustion Engineering," New
York: McGraw-Hill, 1998, pp. 216-221.
[7] A.K. Gupta and Z. Li, "Effect of fuel property on the structure of highly
preheated air flames," J. Energ. Resour-ASME, vol. 5, pp. 247-257, June
1997.
[8] T. Hasegawa, S. Mochida and A. Gupta, "Development of advanced
industrial furnace using highly preheated combustion air," J. Propul.
Power, vol. 18, no. 2, pp. 233-239, Aug. 2002.
[9] A. Kokkinos, D. Wasyluk, D. Adams, R. Yavorsky and M. Brower,
"B&W-s experience reducing NOx emissions in tangentially-fired
boilers," The US EPA/DOE/EPRI combined power plant air pollutant
control symposium, the mega symposium, Chicago, Illinois, USA,
August 20-23, 2001.
[10] A. Frassoldati, S. Firgerio, E. Colombo, F. Inzoli and T. Faravelli,
"Determination of NOx emissions from strong swirling confined flames
with an integrated CFD-based procedure," Chem. Eng. Sci., vol. 60. no.
11, pp. 2851-2869, June 2005.
[11] Fluent Inc, Fluent 6.2 User's Guide, 2005.
[12] R. Siegel and J.R. Howell, "Thermal Radiation Heat," Transfer 3rd ed.
Hemisphere Publishing Corporation, Washington, 1992.
[13] B.E. Launder and D.B. Spalding, "The numerical computation of
turbulent flows," Comp. Meth. Appl. Mech. Eng., vol. 3, no. 2, pp. 269-
289, March 1974.
[14] D.L. Baulch, D.D. Drysdall and D.G. Horne, "Evaluated Kinetic Data
for High Temperature Reactions," Butterworth, 1973.
@article{"International Journal of Mechanical, Industrial and Aerospace Sciences:61005", author = "Abbas Khoshhal and Masoud Rahimi and Sayed Reza Shabanian and Ammar Abdulaziz Alsairafi", title = "CFD Modeling of Reduction in NOX Emission Using HiTAC Technique", abstract = "In the present study, the rate of NOx emission in a
combustion chamber working in conventional combustion and High
Temperature Air Combustion (HiTAC) system are examined using
CFD modeling. The effect of peak temperature, combustion air
temperature and oxygen concentration on NOx emission rate was
undertaken. Results show that in a fixed oxygen concentration,
increasing the preheated air temperature will increase the peak
temperature and NOx emission rate. In addition, it was observed that
the reduction of the oxygen concentration in the fixed preheated air
temperature decreases the peak temperature and NOx emission rate.
On the other hand, the results show that increase of preheated air
temperature at various oxygen concentrations increases the NOx
emission rate. However, the rate of increase in HiTAC conditions is
quite lower than the conventional combustion. The modeling results
show that the NOx emission rate in HiTAC combustion is 133% less
than that of the conventional combustion.", keywords = "CFD Modeling, HiTAC, NOx, Combustion.", volume = "4", number = "2", pages = "256-6", }