International Journal of Energy Engineering          
International Journal of Energy Engineering(IJEE)
ISSN:2225-6563(Print)
ISSN:2225-6571(Online)
Frequency: Yearly
Editor-in-Chief: Prof. Sri Bandyopadhyay(Australia)
Solar-Coal Hybrid Thermal Power Generation —an Efficient Way to Use Solar Energy in China
Full Paper(PDF, 429KB)
Abstract:
To solve the problem of high initial investment and low thermal performance for solar alone thermal power plant, solar/fossil fuels hybrid power system has become a trend of solar thermal power generation in recent years. China is rich in coal and solar energy. At present, coal is the main resource in generating electricity in China. Therefore, solar integrated with conventional coal-fired power generation cycles is considered the best way in China. As an option for easy operation and control flexibility, solar aided feedwater heating of a coal-fired power generation system is discussed and analyzed in this paper. Compared to the common hybrid power system, the main feature of this generation system is, the thermal oil carrying solar energy replaces the extraction steam to heat the feed water and the steam thus saved can continue to do work. Because the solar heat does not enter the turbine, the efficiency (of solar to power) is not limited by the temperature of the solar heat. The performance of the integrated system with different replacements is analyzed based on an example and the impact of solar collector areas and DNI (direct normal irradiation) on the performance of the generation system is discussed as well. The results show that the new integrated system not only contributes to increasing the efficiency of the conventional power station and reducing its emission of greenhouse gases, but also increases the efficiency of solar to electricity; further LEC is also reduced considerably compared with solar only thermal power system. However, the results also indicate that the replacement type, solar collector areas and DNI have great influence on the generation system.
Keywords:Solar Energy; Coal-Fired Thermal Power Generation; Hybrid; Performance
Author: Hongjuan Hou1, Jian Mao1, Yongping Yang1, Na Luo1
1.Beijing Key Laboratory of Safe and Clean Energy Technology, North China Electric Power University Beijing, 102206, China
References:
  1. Jurgen Dersch, Michael Geyer, Ulf Herrmann, et al.. Trough integration into power plants—a study on the performance and economy of integrated solar combined cycle systems[J]. Energy, 2004, 29: 947–959.
  2. Peter Schwarzbozl,Reiner Buck,Chemi Sugarmen,et al.. Solar gas turbine systems: Design, cost and perspectives [J]. Solar Energy, 2005.
  3. Mechthild Horn, Heiner Fuhring, Jurgen Rheinlander. Economic analysis of integrated solar combined cycle power plants A sample case: The economic feasibility of an ISCCS power plant in Egypt [J]. Energy, 2004, 29: 935-945.
  4. Gregory J Kolb. Economic evaluation of solar-only and hybrid power towers using molten-salt technology [J]. Solar Energy, 1998, 62(1): 51-61.
  5. Ying You , Eric J. Hu, Thermodynamic advantages of using solar energy in the regenerative Rankine power plant, Applied Thermal Energy 1999 (19): 1173–1180.
  6. Eric Hu, YongPing Yang , Akira Nishimura , Ferdi Yilmaz , Abbas Kouzani.Solar thermal aided power generation. Applied Energy 2010, 87(9): 2881-2885.
  7. Gupta M.K., Kaushik S.C. Exergetic utilization of solar energy for feed water preheating in a conventional thermal power plant[J]. International Journal of Energy Research. 2009, 33(6): 593-604.
  8. Dimityr Popov. An option for solar thermal repowering of fossil fuel fired power plants. Solar Energy 85 (2011) 344–349.
  9. Yang YongPing, Cui Yinghong, Hou Honjuan et al. Researeh on solar aided coal-fired Power generation system and Performane Analysis[J]. Science In China (Series E). 2008, 51(8): 1211-1221.
  10. Qin Yan, Yongping Yang et. al. Multi-point and multi-level solar integration into a conventional coal-fired power plant [J]. Energy and Fuels. 2010, 24(7), 3733-3738.
  11. Dudley, V., Kolb, G.J., Mahoney, A.R., Mancini, T.R., Matthews, C.W., Sloan, M., and Kearney, D. Test Results: SEGS LS-2 Solar Collector. Sandia National Laboratories, SAND94-1884. December 1994.
  12. Angela M. Patnode.Simulation and performance Evaluation of Parabolic trough solar power plants:[master paper]. University of Wisconsin-Madison,2006.
  13. Forristall, Russell. “Heat Transfer Analysis and Modeling of a Parabolic Trough Solar Receiver Implemented in Engineering Equation Solver.” National Renewable Energy Laboratory, NREL/TP-550-34169. October 2003.
  14. Wanchao Lin.Energy Conservation Theory of Thermal Power Plant [M].1994, Xi’an Jiaotong University, Xi’an.(In Chinese).