Numerical Investigation of Over Fire Air (OFA) Effect on Flow Characteristics, NOx Combustion and Emission in a 600 Mw Tangentially Fired Pulverized Coal Boiler
One of the coal-fired air emissions in boilers is NOx, which has a significant impact on the environment and could cause acid rain, ozone formation, visual impairment and health problems in humans. There are several technologies to reduce and control the formation of NOx emissions, which one of these technologies is the use of over-fire air (OFA). In this research will observe the effect of overfire air (OFA) usage and analyze by numerical 3D modeling method using computational fluid dynamics (CFD) in Paiton 9 power plant boiler and analyzed for 5 (five) OFA damper opening variations, i.e 0%, 25%, 50 %, 75% and 100%. This research will analyze several factors that have significant influence on NOx emission formation, that are: the temperature distribution of the boiler during the combustion process, the distribution of nitrogen oxide (NO) and carbon dioxide (CO2), direction of flue gas flow and trajectory of coal particles and residence time indicating the length of time of burning. The results showed that the lower the flame temperature, the smaller the formation of NOx; the smaller the oxygen content in the combustion process, the smaller the formation of NOx; the shorter the residence time of combustion products in the high temperature zone the smaller the formation of NOx, and the smaller the nitrogen content in coal, the smaller the formation of NOx.
N. Hachenberg, “Prediction of NOx emissions in pulverized coal combustion,” Louisville, 2014.
Y. A. Zeldovich, D. F. Kamenetskii dan P. Sadovnikov, The oxidation of nitrogen in combustion and explosions, USSR: Publishing House of the Academy of Sciences of USSR, 1947.
B. Sudarmanta, R. M. Wijayanto, A. Syaifudin dan G. Nugroho, “Studi numerik pengaruh diameter bed material terhadap karakteristik fluidisasi pada circulating fluidized bed boiler beban 28,6 MW,” dalam Seminar Nasional Teknik Mesin 12, Surabaya, 2017.
F. Winter, C. Wartha, G. Loffler dan H. Hofbauer, “The NO and N2O formation mechanism during devolatilization and char combustion under fluidized-bed conditions,” dalam Symposium (International) on Combustion, Vienna, 1996.
B. Sudarmanta, R. M. Wijayanto, G. Nugroho, A. Syaifudin, A. Setiyawan dan J. B. Ariateja, “Numerical study effect of fluidizing air to erosion pattern in circulating fluidized bed boiler,” The International Journal of Mechanical Engineering and Sciences, vol. 1, no. Institut Teknologi Sepuluh Nopember Surabaya, pp. 17-26, 2017.
R. M. Wijayanto, B. Sudarmanta, A. Syaifudin dan G. Nugroho, “CFD simulation of circulating fluidized bed boiler 30MW: Effect of primary and secondary air distribution on fluidization behavior,” dalam AIP Conference Proceedings, Surabaya, 2018
- There are currently no refbacks.
This work is licensed under a Creative Commons Attribution 4.0 International License.