Effects of Metal Oxides during Pyrolysis Sludge by Kinetic Analysis

Abstract:

On the basis of proximate analysis, element analysis and calorific value that carried out on the sewage sludge, thermogravimetric analyzer (TGA) was conducted on the research of sewage sludge pyrolysis. The loss of sludge under different heating rates was comparative analyzed. And we calculated the activation energy by using Ozawa method, Satava method was also used to infer the most probable mechanism function and kinetic parameters. the result shows that sludge pyrolysis process can be divided into three parts as 200-450°C,450-600°C and above 600°C, the Reaction mechanism functions for the pre main two parts were G(α)=(1-α)^-1 and G(α)=[-ln(1-α)]^2/3respectively. Its proved that Al₂O_3,MgO probably inhibited the decomposition while Fe₂O_3,CaO,ZnO promoted the degradation of organic matters under 200-450°C. CaO and Fe₂O₃ showed advantage while MgO, Al₂O₃, ZnO turned to be disadvantagble when temperature arised to 450-600°C. At the end of pyrolysis, the advantage effects order on pyrolysis : Al₂O₃> Fe₂O₃>MgO >ZnO>CaO.

• Periodical: Advanced Materials Research (Volumes 864-867)
• Pages: 1854-1858
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.864-867.1854
• Online since: December 2013
• Authors: Ren Ping Liu*, Rui Yao, Bin Bin Dong
• Keywords: Kinetic Metal, Sludge Pyrolysis

References

[1] S.J. Xiong , B.P. Zhang, D.K. Yu , et al. Sludge and sludge drying hydrous pyrolysis kinetics, J. of Huazhong Science and Technology University (Natural Science Edition), Vol. 39 (2011), p.124.

[2] H. Feng , Y.G. Zhang , T. Qiu , et al. Municipal Sewage Sludge Pyrolysis . J of Tsinghua University: Natural Science Edition, Vol. 41 (2001), p.90.

[3] J. A. Shao, H. Chen, X. M, Dai , et al. Hong Kong Sludge Pyrolysis experiments, J of Huazhong University (Natural Science Edition), Vol. 41 (2001), p.90. 120.

[4] Y. Chen, J.L. Chen , L.M. Liu , et al. Urban sewage sludge pyrolysis kinetics. Henan Science, Vol. 1 (2007), p.727.

[5] X,R. Liu, Q.G. Lv, K Zhao, et al. Municipal sewage sludge pyrolysis characteristics and kinetics . Power Engineering, Vol. 25(2001), p.677.

[6] R.Z. HU, Q,Z. Shi . Thermal Analysis Kinetics [M]. Beijing: Science Press, (2008).

[7] H. Yang, R. Yan, H. Chen, et al, Influence of mineral matter on pyrolysis of palm oil wastes, Combustion and Flame, Vol. 146 (2006), p.605.

DOI: 10.1016/j.combustflame.2006.07.006

[8] J Shao, R. Yan, H. Chen, et al, Catalytic effect of metal oxides on pyrolysis of sewage sludge, Energy Fuels , Vol. 91 (2010), p.1113.