Effects of operating conditions on deNOx system efficiency in supercritical circulating fluidized bed boiler
Abstract
The purpose of this work was to determine the impact of a operating conditions on the deNOx system efficiency.in a 966MWth supercritical circulating fluidized bed boiler. Experimental tests were carried out on a full-scale DeNOx system installed in the world’s largest once through supercritical circulating fluidized bed boiler. In this work, the effects of the following parameters were studied: flue gas temperature inside the separators between 636°C and 845°C, relative ammonia mass flow over the range 0.22-1.00 and three relative values of O2 concentration (i.e. 0.94, 1.0 and 1.13). The efficiency of deNOx system increases (ca. 53%) with increasing relative ammonia mass flow. A maximum DeNOx system efficiency (ca. 70%) was achieved at flue gas temperature in the range from 720°C to 790°C. In the case of all unit loads, deNOx system efficiency from 36% to 70% was observed and performs a standard emissions relate to permissible concentration of NOx in the flue gas.References
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[2] Skalska K., Miller J.S., Ledakowicz S.: Trens in NOx abatement: A review, Science of the Total Enviroment, 48, 2010, s. 3976-3989.
[3] Shimizu T., Toyono M.: Emission of NOx and N2O during co-combustion of dried sewage sludge with coal in a circulating fluidized-bed combustor, Fuel 86, 2007, s. 2308-2315.
[4] Diego L.F., Londono C.A., Wan X.S., Gibbs B.M.: Influence of operating parameters on NOx and N2O axial profiles in a circulating fluidized-bed combustor, Fuel 75, 1996, s. 971-978.
[5] Zhao J., Brereton C., Grace J.R., Lim J., Legros R.: Gas concentration profiles and NOx formation in circulating fluidized-bed combuston, Fuel 76, 1997, s.853-860.
[6] Zhao J., Grace J.R., Lim J., Brereton C., Legros R.: Influence of operating parameters on NOx emissions from a circulating fluidized-bed combustor, Fuel 73, 1994, s. 1650-1657.
[7] Basu P.: Combustion of coal in circulating fluidized-bed boilers: a review, Chem. Eng. Sci. 54, 1999, s.5547-5557.
[8] Li Z., Lu Q., Na Y., : N2O and NO emissions from co-firing MSW with coals in pilot scale CFBC, Fuel Process. Technol. 85, 2004, s. 1539-1549.
[9] Ogunsola O.L.: Investigation of the cause of seasonal variations on NOx emissions from waste-coal-fired circulating fluidized-bed utility plants, Ind. Eng. Chem. Res. 40, 2011, s. 3869-3878.
[10] Knöbig T., Werther J., L.E. Åmand, Leckner B.: Comparision of large- and small-scale circulating fluidized bed combustors with respect to pollutant formation and reduction for diffrent fuels, Fuel 77, 1998, s. 1635-1642.
[11] Lavoie G.A.: Spectroscopic measurements of nitric oxide in spark ignition engines, Combustion and Flame 15, 1970, s.97-108.
[12] Zeldovich Y.: The oxidation of nitrogen in combustion and explosions, Acta Physicochimica 21, 1946, s.577-628.
[13] Benitez J.: Process engineering and design for air pollution control, Englewood Cliffs, New Yersey: Prentice Hall, s. 116, 1993.
[14] De Nevers N.: Air pollution, physical and chemical fundamentals, 2nd ed. McGraw Hill Higher Education, 1999.
[15] Hoy H.R., Gill D.W.: The combustion of coal in fluidized beds. Chapter 6 in : Lawn C.J., editor, Principles of combustion engineering for boilers, London, Academic Press, s.521, 1987.
[16] Basu P.: Combustion and Gasification in Fluidized Beds, Taylor&Francis Group, 2006.
[17] Schnelle K.B., Brown C.A.: Air polution control technology handbook, Boca Taton, Florida: CRC Press, 2002.
[18] Perry R.H., Green D.W.: Perry’s chemical engineering handbook, 7th ed. McGraw Hill, 1997.
[19] MDU-Westmoreland, Gascoyne Power Project, 175MW CFB BACT Determination, January, 2005.
[20] Wang X.S., Gibbs B.M., Rhodes M.J.: Impact of air staging on the fate of NO and N2O in circulating fluidized-bed combustor, Combustion and Flame 99, 1994, s.508—515.
[21] Gibbs B.M., Salam T.F., Sibtain S.F., Pragnell R.J., Gauld D.W.: The reduction of NOx emissions from a fluidized bed combustor by staged combustion combined with ammonia addition, In: 20th International conference on fluidized bed combustion, San Francisco, USA, vol. 22, 1989, s.1147-1152.
[22] Gibbs B.M., Pereira F.J., Beér J.M.: The influence of air staging on the NO emission from fluidised bed coal combustion, In: 16th Symposium on combustion, USA, vol. 16, 1977, s.461-474, 1977.
[23] Kitto J.B.: Air Pollution control for industrial boiler systems, In: ABMA Industrial Boiler Systems Conference, West Palm Beach, Florida, USA, 1996, s.1-12.
[24] Tran K., Kilpinen P., Kumar N.: In-situ catalytic abatement of NOx during fluidized bed combustion – A literature study, Applied Catalysis B: Enviromental 78, 2008, s.129-138.
[25] Goidich S. J.: Supercritical boiler options to match fuel combustion characteristic. Power-Gen Europe, Madrid, 2007, s. 9-20.
Published
2013-03-18
How to Cite
BŁASZCZUK, Artur; NOWAK, Wojciech; JAGODZIK, Szymon.
Effects of operating conditions on deNOx system efficiency in supercritical circulating fluidized bed boiler.
Journal of Power Technologies, [S.l.], v. 93, n. 1, p. 1--8, mar. 2013.
ISSN 2083-4195.
Available at: <https://papers.itc.pw.edu.pl/index.php/JPT/article/view/400>. Date accessed: 23 apr. 2024.
Issue
Section
Combustion and Fuel Processing
Keywords
supercritical CFB boiler, SNCR method, deNOx system efficiency, oxygen concentration, flue gas temperature
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