THERMAL SCIENCE

International Scientific Journal

PERFORMANCE IMPROVEMENT OF A 330MWE POWER PLANT BY FLUE GAS HEAT RECOVERY SYSTEM

ABSTRACT
In a utility boiler, the most heat loss is from the exhaust flue gas. In order to reduce the exhaust flue gas temperature and further boost the plant efficiency, an improved indirect flue gas heat recovery system and an additional economizer system are proposed. The waste heat of flue gas is used for high-pressure condensate regeneration heating. This reduces high pressure steam extraction from steam turbine and more power is generated. The waste heat recovery of flue gas decreases coal consumption. Other approaches for heat recovery of flue gas, direct utilization of flue gas energy and indirect flue gas heat recovery system, are also considered in this work. The proposed systems coupled with a reference 330MWe power plant are simulated using equivalent enthalpy drop method. The results show that the additional economizer scheme has the best performance. When the exhaust flue gas temperature decreases from 153℃ to 123℃, power output increases by 6.37MWe and increment in plant efficiency is about 1.89%. For the improved indirect flue gas heat recovery system, power output increases by 5.68MWe and the increment in plant efficiency is 1.69%.
KEYWORDS
PAPER SUBMITTED: 2014-01-04
PAPER REVISED: 2014-08-22
PAPER ACCEPTED: 2014-09-01
PUBLISHED ONLINE: 2014-09-06
DOI REFERENCE: https://doi.org/10.2298/TSCI140104099X
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2016, VOLUME 20, ISSUE Issue 1, PAGES [303 - 314]
REFERENCES
  1. China installed capacity of the power industry in 2011, zx.qqfx.com.cn/news/ 110974.html
  2. Guoguang, Z.,Ying, J., Discussion on the influence of boiler heat loss on the boiler thermal balance 337 efficiency, Coal Quality Technology., 4 (2009), pp.46-9
  3. Qun,C.et. al, Condensing boiler applications in the process industry, Applied Energy.,89(2012), 339 pp.30-6
  4. Davor,B., Veljko,F., Potential of waste heat in Croatian industrial sector, Thermal Science., 341 16(2012),3, pp. 747-758
  5. Jianhua,Z.et.al, Generalized predictive control applied in waste heat recovery power plants, 343 Applied Energy., 102(2013), pp. 320-326
  6. Blarke,MB., Towards an intermittency-friendly energy system: Comparing electric boilers and heat 345 pumps in distributed cogeneration, Applied Energy., 91(2012), pp.349-65
  7. Jeong,K.et.al., Analytical modeling of water condensation in condensing heat exchanger, 347 International Journal of Heat and Mass Transfer., 53(2010), pp.2361-8
  8. Naradasu,R.K.,et.al, Thermodynamic analysis of heat recovery steam generator in combined cycle 349 power plant, Thermal Science., 11(2007),4, pp.143-156
  9. Zhelev,T.K., Semkov, K.A., Cleaner flue gas and energy recovery through pinch analysis, Journal 351 of Cleaner Production., 12(2004), 2, pp.165-70
  10. Saidur, R,.et.al.,Energy, exergy and economic analysis of industrial boilers, Energy Policy., 353 38(2010),5, pp.2188-97
  11. Stehlík, P., Conventional versus specific types of heat exchangers in the case of polluted flue gas 355 as the process fluid - A review, Applied Thermal Engineering. , 31(2011),1, pp.1-13
  12. Bahadori, A., Estimation of combustionflue gas acid dew point during heat recovery and 357 efficiency gain, Applied Thermal Engineering. , 31(2011), pp.1457-1462
  13. Qiangtai, Z., Boiler theory, China Electric Power Press., Beijing,China, 2009
  14. Dimitar, K., Nikolai, K., Performance characteristics of a new type of lamellar heat exchanger for 360 the utilization of flue gas heat, Applied Thermal Engineering., 22(2002), pp.1919-1930
  15. Dexin, W.,et.al., Coal power plant flue gas waste heat and water recovery, Applied Energy., 362 91(2012),1, pp.341-348
  16. Lars, W.,et.al., Flue gas purification and heat recovery: A biomass fired boiler supplied with an 364 open absorption system, Applied Energy., 96(2012), pp.444-450
  17. Chaojun, W.,et.al., Application of a low pressure economizer for waste heat recovery from the 366 exhaust flue gas in a 600 MW power plant, Energy., 48(2012),1, pp.196-202
  18. Lingling, Z.,et.al., Influence of 125MW thermodynamic system reform for the economic 368 operation of power set, Journal Of Southeast University (Natural Science Edition)., 33(2003),6, 369 pp.788-791
  19. Gang, X.,et.al., Techno-economic analysis and optimization of the heat recovery of utility boiler

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