Abstract
Calcium propionate (CP) is shown to be useful for simultaneous SO2/NO reduction in coal-fired power plants and its thermal decomposition characteristics are measured by thermogravimetric analysis in a feasibility study into more complete reduction of these hazardous gases. Calcium carbonate (CC), which has been used primarily for in-furnace desulfuration, was used for comparison. The thermal decomposition of this organic calcium-based sorbent began at low temperature, i.e. the carboxylic radical was evaporated from 565 K to 759 K for CP and the corresponding mass loss percentage was 47.79%. The residual was subsequently decomposed to release carbon dioxide between 843 K and 1012 K. The latter phase of the process occurred more readily than with CC because of the loose structure of CP resulting from evaporation of the carboxylic radical in the low temperature zone, which could be seen directly by scanning electron microscope. The maximum mass loss rates of this phase occurred at temperatures of 972 K and 1012 K for CP and CC, respectively. The Ozawa-Flynn-Wall method was used to calculate the activation energy during the thermal decomposition process at heating rates of 5, 7.5, 10 and 15 K/min. The result further confirmed the multistage characteristic of CP thermal decomposition, which could be seen in differential thermogravimetry curves. The reaction orders of CP in the conversion range 20%–80%, calculated using the Avrami theory were from 0.061 to 0.608, smaller than those of CC, which were 1.647 to 2.084.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Han K H, Lu C M, Cheng S Q, et al. Effect of characteristics of calcium-based sorbents on the sulfuration kinetics. Fuel, 2005, 84: 1933–1939
Niu S L, Han K H, Lu C M. Experimental study on the effect of urea and additive injection for controlling nitrogen oxides emissions. Environ Eng Sci, 2010, 27: 47–53
Patsias A A, Nimmo W, Gibbs B M, et al. Calcium-based sorbents for simultaneous NOx/SOx reduction in a down-fired furnace. Fuel, 2005, 84: 1864–1873
Li Y J, Zhao C S, Chen H C, et al. Modified CaO-based sorbent looping cycle for CO2 mitigation. Fuel, 2009, 88: 697–704
Nimmo W, Patsias A A, Hampartsoumian E, et al. Simultaneous reduction of NOx and SO2 emissions from coal combustion by calcium magnesium acetate. Fuel, 2004, 83: 149–155
Nimmo W, Patsias A A, Hampartsoumian E, et al. Calcium magnesium acetate and urea advanced reburning for NO control with simultaneous SO2 reduction. Fuel, 2004, 83: 1143–1150
Otero M, Gomez X, Garcia A I, et al. Effects of sewage sludge blending on the coal combustion: A thermogravimetric assessment. Chemosphere, 2007, 69: 1740–1750
Chang Y, Bai Y P, Teng B, et al. A new drug carrier: Magnetite nanoparticles coated with amphiphilic block copolymer. Chinese Sci Bull, 2009, 54: 1190–1196
Fan C L, Li W, Li X, et al. Efficient photo-assisted Fenton oxidation treatment of multi-walled carbon nanotubes. Chinese Sci Bull, 2007, 52: 2054–2062
O’Connell C A, Dollimore D. A study of the decomposition of calcium propionate, using simultaneous TG-DTA. Thermochim Acta, 2000, 357: 79–87
Barkia H, Belkbir L, Jayaweera S A A. Non-isothermal kinetics of gasification by CO2 of residual carbon from timahdit and tarfay oil shale kerogens. J Therm Anal Calorim, 2004, 76: 623–632
Yagmur S, Durusoy T. Kinetics of the pyrolysis and combustion of Goynuk oil shale. J Therm Anal Calorim, 2006, 86: 479–482
Sheibani S, Ataie A, Heshmati-Manesh S. Kinetics analysis of mechano-chemically and thermally synthesized Cu by Johnson-Mehl-Avrami model. J Alloy Compd, 2008, 455: 447–453
Shen W, He H P, Zhu J X, et al. Preparation and characterization of 3-aminopropyltriethoxysilane grafted montmorillonite and acid-activated montmorillonite. Chinese Sci Bull, 2009, 54: 265–271
Niu S L, Lu C M, Han K H, et al. Thermogravimetric analysis of combustion characteristics and kinetic parameters of pulverized coals in oxy-fuel atmosphere. J Therm Anal Calorim, 2009, 98: 267–274
Tang P, Zhao Y C, Xia F Y. Thermal behaviors and heavy metal vaporization of phosphatized tannery sludge in incineration process. J Therm Anal Calorim, 2009, 20: 1146–1152.
Kok M V. Temperature-controlled combustion and kinetics of different rank coal samples. J Therm Anal Calorim, 2005, 79: 175–180
Otero M, Calvo L F, Gil M V, et al. Co-combustion of different sewage sludge and coal: A non-isothermal thermogravimetric kinetic analysis. Bioresource Technol, 2008, 99: 6311–6319
Simon P, Thomas P S, Okuliar J, et al. An incremental integral isoconversional method: Determination of activation parameters. J Therm Anal Calorim, 2003, 72: 867–874
Ramajo-Escalera B, Espina A, Garcia J R, et al. Model-free kinetics applied to sugarcane bagasse combustion. Thermochim Acta, 2006, 448: 111–116
Ruitenberg G, Woldt E, Petfor-Long A K. Comparing the Johnson-Mehl-Avrami-Kolmogorov equations for iosthermal and linear heating conditions. Thermochim Acta, 2001, 378: 97–105
Lu M G, Shim M J, Kim S W. Curing behavior of an unsaturated polyester system analyzed by Avrami equation. Thermochim Acta, 1998, 323: 37–42
Jiang X M, Cui Z G, Han X X, et al. Thermogravimetric investigation on combustion characteristics of oil shale and high sulphur coal mixture. J Therm Anal Calorim, 2006, 85: 761–764
Nimmo W, Patsias A A, Hall W J, et al. Characterization of a process for the in-furnace reduction of NOx, SO2 and HCl by carboxylic salts of calcium. Ind Eng Chem Res, 2005, 44: 4484–4494
Han D H, Sohn H Y. Calcined calcium magnesium acetate as a superior SO2 sorbent: I. Thermal decomposition. AICHE J, 2002, 48: 2971–2977
Ozbas K E, Kok M V, Hicyilmaz C. Comparative kinetic analysis of raw and cleaned coals. J Therm Anal Calorim, 2002, 69: 541–549
Calvo L F, Otero M, Jenkins B M, et al. Heating process characteristics and kinetics of the rice straw in different atmospheres. Fuel Process Technol, 2004, 85: 279–291
Doyle C D. Kinetic analysis of thermogravimetric data. J Appl Polym Sci, 1961, 5: 285–292
Author information
Authors and Affiliations
Corresponding author
Additional information
This article is published with open access at Springerlink.com
Rights and permissions
This article is published under an open access license. Please check the 'Copyright Information' section either on this page or in the PDF for details of this license and what re-use is permitted. If your intended use exceeds what is permitted by the license or if you are unable to locate the licence and re-use information, please contact the Rights and Permissions team.
About this article
Cite this article
Niu, S., Han, K. & Lu, C. Kinetic calculations for the thermal decomposition of calcium propionate under non-isothermal conditions. Chin. Sci. Bull. 56, 1278–1284 (2011). https://doi.org/10.1007/s11434-010-4065-8
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11434-010-4065-8