Study on Co-combustion Characteristics of Superfine Coal with Conventional Size Coal in O<sub>2</sub>/CO<sub>2</sub> Atmosphere
- 1 Department of Metallurgy and resource, Anhui University of Technology, Ma’an shan, China
- 2 Department of Metallurgy and resource, Anhui University of Technology, Ma’an shan, China
- 3 Department of Metallurgy and resource, Anhui University of Technology, Ma’an shan, China
- 4 Department of Metallurgy and resource, Anhui University of Technology, Ma’an shan, China
Abstract
The pulverized coal combustion in O 2 /CO 2 atmosphere is one of the promising new technologies which can reduce the emission of carbon dioxide and NOx. In this study, the combustion behaviors of different mixing ratio of Shenhua coal with 20 μm and 74 μm particle size in the O 2 /CO 2 atmosphere and air atmosphere were studied by using a thermal-gravimetric analyzer. The combustion characteristics such as ignition and burnout behavior were investigated in the temperature from 2 0 ℃ to 850 ℃ . The influence of mixing ratio on combustion characteristics was conduced. The results obtained showed that the ignition temperature of the two kinds of particle size in O 2 /CO 2 atmosphere is higher than in the air, while the activation energy in O 2 /CO 2 atmosphere is lower. With the increasing ratio of 20 μm superfine pulverized coal s , the ignition temperature and the activation energy decreased, while the DTG peak value increased, the maximum burning rate position advanced. There were three trends for the ignition temperature curve with the increasing of superfine coal ratio: the ignition of the mixed coal decreased rapidly, then changed less, at last reduced quickly.
- K. J. McCauley, H. Farzan, K. C. Alexander, et al., “Commercialization of Oxy-coal Combustion: Applying Results of a Large 30 mwth Pilot Project,” Energy Procedia, Vol.1, No.1, 2009, pp. 439-446. doi:10.1016/j.egypro.2009.01.059
- A. Klas and J. Filip, “Process Evaluation of an 865 MWe Lignite Fired O 2 /CO 2 Power Plant,” Energy Conversion and Management, Vol. 47, No. 18-19, 2006, pp. 3487-3498．doi:10.1016/j.enconman.2005.10.017
- M. C. Carboa, D. Jansena and C. Hendriksb, “Opportunities for CO 2 Capture through Oxygen Conducting Membranes at Medium-scale Oxyfuel Coal Boilers,” Energy Procedia, Vol. 1, No. 1, 2009, pp. 487-494. doi:10.1016/j.egypro.2009.01.065
- N. Zhang and N. Lior, “Two Novel Oxy-fuel Power Cycles Integrated with Natural Gas Reforming and CO 2 Capture,” Energy, Vol. 33, No. 2, 2008, pp. 340-351. doi:10.1016/j.energy.2007.09.006
- M. Y. Gu, H. Y. Dong, X. H. liu and J. X. Li, “Study on Pulverized Coal Combustion in O 2 /CO 2 Atmosphere,” APPEEC 2011, Wuhan, China, 25-28March.
- J. C. Chen, Z. S. Liu and J. H. Huang, “Emission Chamcieris Idcs of Coal Combustion in Different O 2 /N 2 , O 2 /CO 2 atmosphere,” Journal of Hazardous Mate-rials,Vol.42, No.1-2, 2007, pp. 266-271.doi:10.1016/j.jhazmat.2006.08.021
- L. Zhang, Eleanor Binner, Y. Qiao and C. Z. Li, “High-Speed Camera Observation of Coal Combustion in Air and O 2 /CO 2 Mixtures and Measurement of Burning Coal Particle Velocity,” Energy Fuels, Vol. 24, No.1, 2010, pp. 29-37.doi:10.1021/ef900463r
- A. Molina and C. R. Shad-dix, “Ignition and Devolatilization of Pulverized Bituminous Coal Particles during Oxygen/carbon Dioxide Coal Combustion,” Proceedings of the Combustion Institute, Vol. 21, No. 2, 2007, pp.1905-1912.doi:10.1016/j.proci.2006.08.102
- X. M. Jiang, X. Y. Huang, J. X. Liu and X. X. Han, “NOx Emission of Fine and Superfine- pulverized Coal Combustion in O 2 /CO 2 Atmosphere,” Energy Fuels, Vol. 24, No.12, 2010, pp. 6307-6313. doi:10.1021/ef101029e
- E. Kakaras, A. Doukelis, D. Giannakopoulos, et a1., “Economic Implications of Oxyfuel Application in a Lignite-fired Power Plant,” Fuel, Vol. 86, No. 14, 2007, pp. 2151-2158.doi:10.1016/j.fuel.2007.03.035
- M. Y. Gu, H. Y. Dong, X. H. Liu and J. X. Li, “Study on Pulverized Coal Combustion in O 2 /CO 2 Atmosphere,” 2011 Asia-Pacific Power and Energy Engineering Conference, 25–28March 2011,Wuhan, China.
- X. H. Liu, M. Y. Gu, B. Ma and J. X. Li, “Study on Co-combustion Characteristics of Coals under Pure Oxygen Atmosphere,” China Engineering Thermal Physics Conference Burning Academic Conference, 2011, HangZhou, China.