The Carbonation Behaviors of Limestone Particle in Oxygen-Fuel Circulating Fluidized Bed O₂/CO₂ Flue Gas

Jianyu Shang, Zhongliang Liu, Chunbo Wang

1College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, China.
2School of Energy and Power Engineering, North China Electric Power University, Baoding, China..
College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, China;.

DOI: 10.4236/jpee.2013.12002                

Abstract

Limestone powder is still applied as SO₂ sorbent in emerging oxygen-fuel circulating fluidized bed boiler, but its carbonation in O₂/CO₂ flue gas is an unclear problem. For a better understanding of carbonation behaviors, the tube furnace heating system was built for simulating circulating fluidized bed boiler flue gas by regulating the supply of O, CO₂, N₂, SO₂ and H₂O, and Carbonation reaction was tested. Thermal gravimetric analysis and scanning electron microscopy were used. It was found that carbonation is closely related to temperature, CO₂ concentration, impurities, water vapor, and cycle times; high temperature can promote carbonation process; high concentration of CO₂ can inhibit the chemical reaction stage speed of carbonation process, but it has little effect on the final conversion rate; water vapor can increase the final conversion rate of carbonation; the cycle times will reduce the activity of carbonation. The presence of carbonation turns the traditional boiler flue gas indirect desulfurization model into indirect desulfurization mechanism which does not have a negative impact on SO₂ removal efficiency.

Keywords

Oxygen-Fuel; Circulating Fluidized Bed; Limestone Particle; Carbonation; Desulfurization; Production Layer

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	J.-M. Lee, D.-W. Kim, J.-S. Kim, et al., “Evaluation of the Performance of a Commercial Circulating Fluidized Bed Boiler by Using IEA-CFBC Model: Effect of Primary to Secondary Air Ratio,” Korean Journal of Chemical Engineering, Vol. 30, No. 5, 2013, pp. 1058-1066. http://dx.doi.org/10.1007/s11814-012-0206-x
[2]	P. Cordoba, C. Ayora, N. Moreno, et al., “Influence of an Aluminium Additive in Aqueous and Solid Speciation of Elements in Flue Gas Desulphurisation (FGD) System,” Energy, Vol. 50, 2013, pp. 438-444. http://dx.doi.org/10.1016/j.energy.2012.11.020
[3]	O. Font, P. Cordoba, C. Leiva, et al., “Fate and Abatement of Mercury and Other Trace Elements in a Coal Fluidised Bed Oxy Combustion Pilot Plant,” Fuel, Vol. 95, 2012, pp. 272-281. http://dx.doi.org/10.1016/j.fuel.2011.12.017
[4]	P. M. Carmona-Quiroga, I. Panas, J.-E. Svensson, et al., “Protective Performances of Two Anti-Graffiti Treatments towards Sulfite and Sulfate Formation in SO2 Polluted Model Environment,” Applied Surface Science, Vol. 257, No. 3, 2010, pp. 852-856. http://dx.doi.org/10.1016/j.apsusc.2010.07.080
[5]	J. M. Valverde, F. J. Duran, F. Pontiga, et al. “CO2 Capture Enhancement in a Fluidized Bed of a Modified Geldart C Powder,” Powder Technology, Vol. 224, 2012, pp. 247-252. http://dx.doi.org/10.1016/j.powtec.2012.02.060
[6]	L. F. De Diego, M. De las Obras-Loscertales, F. Garcia-Labiano, et al., “Characterization of a Limestone in a Batch Fluidized Bed Reactor for Sulfur Retention under Oxy-Fuel Operating Conditions,” International Journal of Greenhouse Gas Control, Vol. 5, No. 5, 2011, pp. 1190-1198. http://dx.doi.org/10.1016/j.ijggc.2011.05.032
[7]	R. Pisani and D. De Moraes Jr., “Removal of Sulfur Dioxide from a Continuously Operated Binary Fluidized Bed Reactor Using Inert Solids and Hydrated Lime,” Journal of Hazardous Materials, Vol. 109, No. 1-3, 2004, pp. 183-189. http://dx.doi.org/10.1016/j.jhazmat.2004.03.005
[8]	J. Saastamoinen, T. Pikkarainen, A. Tourunen, et al., “Model of Fragmentation of Limestone Particles during Thermal Shock and Calcination in Fluidised Beds,” Powder Technology, Vol. 187, No. 3, 2008, pp. 244-251. http://dx.doi.org/10.1016/j.powtec.2008.02.016
[9]	K. Wang, X. Guo, P. F. Zhao, et al., “CO2 Capture of Limestone Modified by Hydration-Dehydration Technology for Carbonation/Calcination Looping,” Chemical Engineering Journal, Vol. 173, No. 1, 2011, pp. 158-163.
[10]	J. M. Valverde, F. J. Duran, F. Pontiga, et al., “CO2 Capture Enhancement in a Fluidized Bed of a Modified Geldart C Powder,” Powder Technology, Vol. 224, 2012, pp. 247-252. http://dx.doi.org/10.1016/j.powtec.2012.02.060
[11]	C. B. Wang, L. F. Jia, Y. W. Tan, et al., “Influence of Water Vapor on the Direct Sulfation of Limestone under Simulated Oxy-Fuel Fluidized-Bed Combustion (FBC) Conditions,” Energy & Fuels, Vol. 25, No. 2, 2011, pp. 617-623. http://dx.doi.org/10.1021/ef1004573
[12]	F. Scala and P. Salatino, “Flue Gas Desulfurization under Simulated Oxyfiring Fluidized Bed Combustion Conditions: The Influence of Limestone Attrition and Frag mentation,” Chemical Engineering Science, Vol. 65, No. 1, 2010, pp. 556-561. http://dx.doi.org/10.1016/j.ces.2009.03.020
[13]	M. C. Stewart, R. T. Symonds and V. Manovic, “Effects of Steam on the Sulfation of Limestone and NOx Formation in an Air- and Oxy-Fired Pilot-Scale Circulating Fluidized Bed Combustor,” Fuel, Vol. 92, No. 1, 2012, pp. 107-115. http://dx.doi.org/10.1016/j.fuel.2011.06.054
[14]	B. R. Stanmore and P. Gilot, “Review—Calcination and Carbonation of Limestone during Thermal Cycling for CO2 Sequestration,” Fuel Processing Technology, Vol. 86, No. 16, 2005, pp. 1707-1743. http://dx.doi.org/10.1016/j.fuproc.2005.01.023
[15]	R. T. Symonds, D. Y. Lu, A. Macchi, et al., “CO2 Capture from Syngas via Cyclic Carbonation/Calcination for a Naturally Occurring Limestone: Modelling and Bench-Scale Testing,” Chemical Engineering Science, Vol. 64, No. 15, 2009, pp. 3536-3543. http://dx.doi.org/10.1016/j.ces.2009.04.043
[16]	C. B. Wang, L. F. Jia, Y. W. Tan, et al., “Carbonation of Fly Ash in Oxy-Fuel CFB Combustion,” Fuel, Vol. 87, No. 7, 2008, pp. 1108-1114. http://dx.doi.org/10.1016/j.fuel.2007.06.024
[17]	Gemma S. Grasa, J. C. Abanades, M. Alonso, et al., “Reactivity of Highly Cycled Particles of CaO in a Carbonation/Calcination Loop,” Chemical Engineering Journal, Vol. 137, No. 3, 2008, pp. 561-567. http://dx.doi.org/10.1016/j.cej.2007.05.017
[18]	A. Martínez, P. Lisbona, Y. Lara, et al., “Carbonate Looping Cycle for CO2 Capture: Hydrodynamic of Complex CFB Systems,” Energy Procedia, Vol. 4, 2011, pp. 410-416.
[19]	L. M. Romeo, J. C. Abanades, J. M. Escosa, et al., “Oxyfuel Carbonation/Calcination Cycle for Low Cost CO2 Capture in Existing Power Plants,” Energy Conversion and Management, Vol. 49, No. 10, 2008, pp. 2809-2814. http://dx.doi.org/10.1016/j.enconman.2008.03.022
[20]	B. González, M. Alonso and J. C. Abanades, “Sorbent Attrition in a Carbonation/Calcination Pilot Plant for Capturing CO2 from Flue Gases,” Fuel, Vol. 89, No. 10, 2010, pp. 2918-2924. http://dx.doi.org/10.1016/j.fuel.2010.01.019
[21]	H. C. Chen and C. S. Zhao, “Development of a CaO-Based Sorbent with Improved Cyclic Stability for CO2 Capture in Pressurized Carbonation,” Chemical Engineering Journal, Vol. 171, No. 1, 2011, pp. 197-205. http://dx.doi.org/10.1016/j.cej.2011.03.091
[22]	C. Hisa, G. R. St. Pierre and L.-S. Fan, “Isotope Study on Diffusion in CaSO4 Formed during Sorbent-Flue-Gas Reaction,” AICHE Journal, Vol. 41, No. 10, 1995, pp. 2337-2340. http://dx.doi.org/10.1002/aic.690411020