Experimental Research on Spontaneous Combustion Tendency of High Volatile Blended Coals

DOI: 10.4236/eng.2013.53042   PDF   HTML     3,851 Downloads   5,583 Views   Citations

Abstract

Experiment of oxidation characteristics with slow velocity of high volatile blended coals was investigated in the surroundings of low oxygen conditions, which gives three kinetic factors in the step of low temperature through the methods of thermo gravimetric analysis, the Coats-Redfern integration and Achar-Brindley-Sharp-Wendworth. The results of calculation show that activation energy and pre-exponential factor increase with the reaction process, and tendency of spontaneous combustion of the blended coal have changed. The experimental results show that the type of absorbing oxygen is mainly physical adsorption and calorific value is very small during increasing weight. Volatile of blended coal releases before single coal and combustion temperature of blended coal is between one and other single coals. If the oxygen content is below 16% in the milling system, explosion-proof effect on high volatile blended coal can be obtained.

Share and Cite:

J. Ma, F. Shao, J. Shi, Z. Xue, S. Wang, H. Li and H. Zhang, "Experimental Research on Spontaneous Combustion Tendency of High Volatile Blended Coals," Engineering, Vol. 5 No. 3, 2013, pp. 309-315. doi: 10.4236/eng.2013.53042.

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1] M. Yu, Y. Zheng and C. Lu, “Thermal Analysis Experiment on Low-Temperature Oxidation and Pyrolysis of Coal,” China Safety Science Journal, Vol. 19, No. 9, 2009, pp. 83-86.
[2] M. G. Yu, Y. M. Zheng and C. Lu, “Kinetic Analysis of Oxidation and Degradation Reaction of Lignite and Lean Coal,” Fire Safety Science, Vol. 18, No. 3, 2009, pp. 143-146.
[3] Q. L. He and D. M. Wang, “Kinetics of Oxidation and Thermal Degredation Reaction of Coal,” Journal of Science and Technology Beijing, Vol. 28, No. 1, 2006, pp. 1-4.
[4] L. H. Wei, R. D. Li and A. M. Li, “Thermogravimetric Analysis on the Pyrolysis Characteristics of Pulverized Coal,” Proceedings of the Chinese Society for Electrical Engineering, Vol. 28, No. 26, 2008, pp. 53-58.
[5] X. Gou, “Experimental, Theoretical and Numerical Simulation Research on Direct Flow Pulverized Coal Low NOx Combustion and Reburning Technology,” Ph.D. Thesis, Zhejiang University, Hangzhou, 2007.
[6] X. H. Xian, Y. G. Du and G. H. Zhang, “Combusion Characteristics of Coal Blending by TG-DTG/DTA,” Coal Conversion, Vol. 34, No. 5, 2011, pp. 67-70.
[7] Q. Tang, L. P. Wang and Y. F. Yan, “Study on Combusion and Kinetic Characteristics of Pulverized Coalin Oxygen Enriched Environments,” Coal Conversion, Vol. 32, No. 3, 2009, pp. 55-59.
[8] L. H. Wei, “Study on Combusion Mechanism of Micro-Pulverized Coal,” Harbin Institute of Technology, Harbin, 2007.
[9] L. Guan, “Study on Explosion Venting of Coal Pulverizing Process in Power Plant,” Northeastern University, Shenyang, 2003.
[10] J. F. Ma, J. X. Wu and T. S. Zhou, “Study on Lignite Blended Burning Technology in the Bin Feedercoal Pulverizing System,” Journal of Power Engineering, Vol. 28, No. 1, 2008, pp. 14-18.
[11] C. B. Deng, “Study on Coal Spontaneous Combustion Mechanisms and Spontaneous Combustion Danger Index,” Liaoning Technical University, Fuxin, 2006.
[12] X. Y. Ge, “Experimental Research on Oxidation Kinetics of Coal Based on Thermal Analysis Technology,” Anhui University of Science and Technology, Huainan, 2009.
[13] R. Z. Hu and Q. Z. Shi, “Kinetics of Thermal Analysis,” Science Press, Beijing, 2001.
[14] T. P. Bagchi, P. K. Agarwal and R. D. Gunn, “Calculation of Thermal Explosion Limits,” Thermochimca Acta, No. 51, 1981, pp. 175-176. doi:10.1016/0040-6031(81)85157-X
[15] Y. Z. Li, “Thermal Analysis,” Tsinghua University Press, Beijing, 1987.
[16] W. Lu, D. M. Wang and X. X. Zhong, “Tendency of Spontaneous Combustion of Coal Based on Activation Energy,” Journal of China University of Mining and Technology, Vol. 35, No. 2, 2006, pp. 201-205.

  
comments powered by Disqus

Copyright © 2020 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.