Emissions of CO2, CO, NOx and N2O from dried lignite combustion in oxygen-enriched O2/CO2 atmospheres in a circulating fluidized bed boiler

• Autorzy: Krzywański J. , Czakiert T. , Muskała W. , Nowak W. , Pacyna J.
• Języki publikacji: EN

Abstrakty

EN

The paper presents the idea of oxygen-enhanced dried lignite combustion in a circulating fluidized bed (CFB) boiler as it gives a possibility of reduction of gaseous pollutants emissions. Calculations were conducted using one-dimensional model, which describes crucial processes associated with combustion of solid fuels under circulating fluidized bed conditions, e.g., hydrodynamics of bed material, fuel devolatilization, volatiles and char combustion and heat transfer. The paper is focused on CO2, CO, NOx and N2O emissions from a 670 t/h CFB boiler during dried lignite combustion in O2/CO2 atmosphere. The dependence of the gaseous pollutants’ emissions on oxygen fraction in an inlet gas as well as moisture content in lignite were studied. The oxygen fraction was increased from 21 to 30% vol., whereas moisture content was decreased from 43.5 to 10% – simulating fuel pre-drying. A case study considers solution when process is run with recirculation of CO2. The obtained results was compared to the case where CO2 is not recycled.

Słowa kluczowe

EN

oxy-coal combustion; CFB; combustion; modeling

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN
• Czasopismo: Transactions of the Institute of Fluid-Flow Machinery
• Rocznik: 2016
• Tom: nr 132
• Strony: 71--85
• Opis fizyczny: Bibliogr. 26 poz., rys., tab.

Twórcy

autor

Krzywański J.

• Jan Dlugosz University in Częstochowa, Faculty of Mathematics and Natural Sciences, Armii Krajowej 13/15, 42-200 Częstochowa, Poland

autor

Czakiert T.

• Częstochowa University of Technology, Institute of Advanced Energy Technologies, Dąbrowskiego 73, 42-200 Częstochowa, Poland

autor

Muskała W.

• Częstochowa University of Technology, Institute of Advanced Energy Technologies, Dąbrowskiego 73, 42-200 Częstochowa, Poland

autor

Nowak W.

• AGH University of Science and Technology, Faculty of Energy and Fuels, Czarnowiejska 30, 30-059 Cracow, Poland

autor

Pacyna J.

• Norwegian Institute for Air Research, Po.box 100, 2027 Kjeller, Norway

Bibliografia

• [1] Saastamoinen J., Tourunen J., Pikkarainen T., Hasa H., Mittinen J., Hyppanen T., Myohanen K.: Fluidized bed combustion in high concentration of O2 and CO2. In: Proc. 19th CFB Conf., Vienna, 21–24 May, 2006.
• [2] Pikkarainen T., Tourunen A., Nevalainen H., Leino T., Saastamoinen J., Eriksson T.: Small scale fluidized bed experiments under oxygen combustion conditions. In.: Int. Conf. on Coal Science and Techology, University of Nottingham, 28–31 Aug. 2007.
• [3] Eriksson T., Nuortimo K., Hotta A., Myohanen K., Hyppanen T., Pikkarainen T.: Near Zero CO2 Emissions In Coal Firing With Oxyfuel CFB Boiler. http://www.fwc.com/publications/tech_papers/files/TP_CCS_08_01.pdf.
• [4] Klostermann M., Kather A.: Efficiency improvement of oxyfuel processes. In: Proc. 35th Int. Tech. Conf. on Clean Coal and Fuel Systems, The Clearwater Clean Coal Conference, Clearwater, Florida, 6–10 June, 2010, 30–38.
• [5] McDonald D., Tranier J.-P.: Oxy-coal is ready for demonstration. In: Proc. Proc. 35th Int. Tech. Conf. on Clean Coal and Fuel Systems, The Clearwater Clean Coal Conference, Clearwater, Florida, 6–10 June, 2010, 39–50.
• [6] Lawrence E., Laux S., Eddings E.: Oxy-coal combustion in a small-scale CFB. In: Proc. 35th Int. Tech. Conf. on Clean Coal and Fuel Systems, The Clearwater Clean Coal Conference, Clearwater, Florida, 6–10 June, 2010, 190–196.
• [7] Hack H., Fan Z., Seltzer A.: Advanced oxyfuel combustion leading to zero emission power generation. In: Proc. 35th Int. Tech. Conf. on Clean Coal and Fuel Systems, The Clearwater Clean Coal Conference, Clearwater, Florida, 6–10 June, 2010, 256–266.
• [8] Kuivalainen R., Eriksson T., Hotta A., Sacristan A.S.-B., Jubitero J.M., Ballesteros J.C., Lupion M., Cortes V., Anthony B., Jia L., McCalden D., Tan Y., He I., Wu Y., Symonds R.: Development and demonstration of oxy-fuel CFB technology. In: Proc. 35th Int. Tech. Conf. on Clean Coal and Fuel Systems, The Clearwater Clean Coal Conference, Clearwater, Florida, 6–10 June, 2010, 731–742.
• [9] Nowak W.: Oxyfuel combustion of coal in fluidized beds. In: Proc. Int. Conf. on Boiler Technology 2009, Szczyrk, 13–15 Oct., 2009, 217–237.
• [10] Thambimuthu K.V., Croiset E.: Enriched oxygen coal-fired combustion. In: Proc. Conf. on The Advanced Coal-Based Power and Environmental Systems, Morgantown, 21–23 July, 1998.
• [11] Kimura K., Takano S., Kiga T., Miyamae S., Noguchi Y., Tanaka T.: Experimental studies on pulverized coal combustion with oxygen/flue gas recycle for CO2 recovery. In: Proc. JSME-ASME Int. Conf. on Power Engineering, Tokyo, 12–16 Sept., 1993, 487–492.
• [12] Kather A., Hermsdorf C., Klostermann M.: Der Kohlebefeuerte Oxyfuel Prozess, VGB PowerTech. 4(2007), 84–91.
• [13] Zhou W., Zhao C., Duan L., Liu D., Chen X.: CFD modeling of oxy-coal combustion in circulating fluidized bed. Int. J. Greenh. Gas Con., DOI:10.1016/j.ijggc.2011.08.006
• [14] Muskała W., Krzywanski J., Czakiert T., Nowak W.: The research of CFB boiler operation for oxygen – enhanced dried lignite combustion. Rynek Energii 1(92) 2011, 172–176.
• [15] Krzywanski J., Czakiert T., Muskała W., Nowak W.: Modelling of CO2, CO, SO2, O2 and NOx emissions from the oxy-fuel combustion in a circulating fluidized bed. Fuel Process. Technol. 92(2011), 3, 590–596.
• [16] Krzywanski J., Czakiert T., Muskała W., Sekret R., Nowak W.: Modeling of solid fuels combustion in oxygen-enriched atmosphere in circulating fluidized bed boiler. Part 1. The mathematical model of fuel combustion in oxygen-enriched CFB environment. Fuel Process. Technol. 91(2010), 3, 290–295.
• [17] Krzywanski J., Czakiert T., Muskala W., Sekret R., Nowak W.: Modeling of solid fuel combustion in oxygen-enriched atmosphere in circulating fluidized bed boiler. Part 2. Numerical simulations of heat transfer and gaseous pollutant emissions associated with coal combustion in O2/CO2 and O2/N2 atmospheres enriched with oxygen under circulating fluidized bed conditions. Fuel Process. Technol. 91(2010), 4, 364–368.
• [18] Muskała W., Krzywański J., Sekret R, Nowak W.: Model research of coal combustion in circulating fluidized bed boilers. Chem. Process Eng. 29(2008), 3, 473–492.
• [19] Klajny T., Krzywanski J., Nowak W.: Mechanism and Kinetics of coal combustion in oxygen enhanced conditions. In: Proc. 6th Int. Symp. on Coal Combustion, Wuhan, 1–4 Dec., 2007, 148–153.
• [20] Nowak W., Klajny T., Krzywański J., Czakiert T.: Mechanism of coal combustion in oxygen enhanced conditions. In: Proc. 20th Int. Symp. on Chemical Reaction Engineering, Kyoto, 7–10 Sept., 2008, Book of Abstracts, 410–411.
• [21] Werther J.: Fluid dynamics, temperature and concentration fields in large-scale CFB combustors. In: Proc. 8th Int. Con. on Circulating Fluidized Beds, Hangzhou 10–13 May, 2005, 1–25.
• [22] Hayhurst A.N., Lawrence A.D.: The amounts of NOx and N2O formed ina fluidized bed combustor during the burning of coal volatiles and also of char. Combust. Flame 105(1996), 3, 341–357.
• [23] Chen Z., Mu Lin, Ignowski J., Kelly B., Linjewile T.M., Agarwal P.K.: Mathematical modeling of fluidized bed combustion. 4: N2O and NOx emissions from the combustion of char. Fuel 80(2001), 9, 1259–1272.
• [24] Johnsson J.: A kinetic model for NOx formation in fluidized bed combustion. In: Proc. 10th Int. Conf. on FBC, San Francisco, 1989, 1111.
• [25] Mukadi L., Guy C., Legros R.: Prediction of gas emissions in an internally circulating fluidized bed combustor for treatment of industrial solid wastes. Fuel 79(2000), 9, 1125– 1136.
• [26] Dors M.: Towards clean energy production. Transactions of IFFM, 127(2015), 91–116.

Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.