Performance assessment and leakage analysis of feed water pre-heaters in natural gas–fired steam power plants
Abstract
The performance of feed water pre-heaters (FWH) at a steam power plant with a capacity of 200 MW is evaluated in thispaper. The main objective of this study is to investigate the behavior of these FWHs in various cases. The effect of leakage ofcondensates on the condenser was also studied in detail. To do this, each FWH was studied separately and also in groups (LP,HP and both groups). While some of the results are exclusive to the studied power plant, others can be generalized to similarpower plants. The results show that although LPH-1 and LPH-2 have the lowest exergy efficiency, they have the greatesteffect on the efficiency of the cycle. Whereas HPH-6 and LPH-4 have the highest heat exchange (31.3 and 21.73 MW),LPH-2 and LPH-1 deliver the greatest positive effect on energy efficiency (0.81% and 0.61/0%). Moreover, the results showthe particular importance of preventing any leakage of heater condensate. In the event of leakage along the route to thecondensate of heaters, the most negative effect will be due to the HP heaters: 20 kg/s leakage in the HPHs line will cause anincrease in CO2 production p.a. of roughly 10150 metric tons. Furthermore, energy efficiency and power produced will fall by0.374% and 5.1 MW. In terms of the impact of leakages on the cooling tower, the study showed that LPH-1 and LPH-2 havethe greatest effect. The effects of LP and HP FWHs on the energy efficiency of the cycle were 2.53% and 0.82%.References
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Reviews 82 (2018) 1–5.
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steam power plant in iran, Renewable and Sustainable Energy Reviews
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[3] S. L. Dixon, Fluid Mechanics, Thermodynamics of Turbomachinery, 7th
Edition, Pergamon Press, 2014.
[4] Iran detailed statistics of electricity industry, for strategic management,
in Persian (accessed 4.10.2018) (2016).
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[5] A. R. Seifi, O. A. Akbari, A. A. Alrashed, F. Afshary, G. A. S. Shabani,
R. Seifi, M. Goodarzi, F. Pourfattah, Effects of external wind breakers
of heller dry cooling system in power plants, Applied Thermal Engineering
129 (2018) 1124–1134.
[6] G. Ahmadi, O. A. Akbari, M. Zarringhalam, Energy and exergy analyses
of partial repowering of a natural gas-fired steam power plant,
International Journal of Exergy 23 (2) (2017) 149–168.
[7] S. N. Naserabad, A. Mehrpanahi, G. Ahmadi, Multi-objective optimization
of hrsg configurations on the steam power plant repowering specifications,
Energy 159 (2018) 277–293.
[8] G. Ahmadi, D. Toghraie, O. A. Akbari, Technical and environmental
analysis of repowering the existing chp system in a petrochemical
plant: A case study, Energy 159 (2018) 937–949.
[9] O. Akbari, A. Marzban, G. Ahmadi, Evaluation of supply boiler repowering
of an existing natural gas-fired steam power plant, Applied Thermal
Engineering 124 (2017) 897–910.
[10] G. R. Ahmadi, D. Toghraie, Parallel feed water heating repowering of
a 200 mw steam power plant, Journal of Power Technologies 95 (4)
(2015) 288–301.
[11] G. Ahmadi, D. Toghraie, A. Azimian, O. A. Akbari, Evaluation of synchronous
execution of full repowering and solar assisting in a 200 mw
steam power plant, a case study, Applied Thermal Engineering 112
(2017) 111–123.
[12] G. Ahmadi, O. A. Akbari, M. Zarringhalam, Energy and exergy analyses
of partial repowering of a natural gas-fired steam power plant,
International Journal of Exergy 23 (2) (2017) 149–168.
[13] G. Ahmadi, D. Toghraie, O. A. Akbari, Solar parallel feed water heating
repowering of a steam power plant: a case study in iran, Renewable
and Sustainable Energy Reviews 77 (2017) 474–485.
[14] G. Ahmadi, D. Toghraie, O. A. Akbari, Efficiency improvement of a
steam power plant through solar repowering, International Journal of
Exergy 22 (2) (2017) 158–182.
[15] G. P. Varma, T. Srinivas, Parametric analysis of steam flashing in a
power plant using waste heat of cement factory, Energy Procedia 90
(2016) 99–106.
[16] A. Pourshaghaghy, The optimum pressure for working fluid in feed water
heaters of steam power plants, Energy Equipment and Systems
4 (2) (2016) 245–253.
[17] A. Moghadassi, F. Parvizian, B. Abareshi, F. Azari, I. Alhajri, Optimization
of regenerative cycle with open feed water heater using genetic
algorithms and neural networks, Journal of Thermal Analysis and
Calorimetry 100 (3) (2010) 757–761.
[18] S. Farhad, M. Saffar-Avval, M. Younessi-Sinaki, Efficient design of
feedwater heaters network in steam power plants using pinch technology
and exergy analysis, International journal of energy research
32 (1) (2008) 1–11.
[19] H. D. Akolekara, P. Srinivasan, J. Challa, Development of a simulation
program to optimise process parameters of steam power cycles, International
Journal of Thermal & Environmental Engineering 8 (1) (2014)
55–61.
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investigation on the partial load feedwater heating system with thermal
vapor compressor in a coal-fired power unit, Energy Procedia 75
(2015) 1102–1107.
[21] M. A. Antar, S. M. Zubair, The impact of fouling on performance evaluation
of multi-zone feedwater heaters, Applied Thermal Engineering
27 (14-15) (2007) 2505–2513.
[22] J.-q. Xu, T. Yang, Y.-y. Sun, K.-y. Zhou, Y.-f. Shi, Research on varying condition characteristic of feedwater heater considering liquid level,
Applied Thermal Engineering 67 (1-2) (2014) 179–189.
[23] M. Álvarez-Fernández, L. del Portillo-Valdés, C. Alonso-Tristán, Thermal
analysis of closed feedwater heaters in nuclear power plants, Applied
Thermal Engineering 68 (1-2) (2014) 45–58.
[24] S. Espatolero, L. M. Romeo, C. Cortés, Efficiency improvement strategies
for the feedwater heaters network designing in supercritical coalfired
power plants, Applied Thermal Engineering 73 (1) (2014) 449–
460.
[25] S. Hossienalipour, S. Karbalaee, H. Fathiannasab, Development of a
model to evaluate the water level impact on drain cooling in horizontal
high pressure feedwater heaters, Applied Thermal Engineering 110
(2017) 590–600.
[26] C. Goujon, T. Pauporté, A. Bescond, C. Mansour, S. Delaunay, J.-
L. Bretelle, Effects of curative and preventive chemical cleaning processes
on fouled steam generator tubes in nuclear power plants, Nuclear
Engineering and Design 323 (2017) 120–132.
[27] I. E. Cáceres, R. M. Montañés, L. O. Nord, Flexible operation of combined
cycle gas turbine power plants with supplementary firing, Journal
of Power Technologies 98 (2) (2018) 188–197.
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flexibility and emissions of gas-and coal-fired power plants in a
future with growing renewables, Renewable and Sustainable Energy
Reviews 82 (1) (2018) 1497–1513.
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URL http:en.persian-holding.ir/MMPowerplant
[30] Department of Environment, Islamic Republic of Iran, accessed
4.10.2018.
URL https://en.doe.ir/Portal/Home/default.aspx
[31] C. Borgnakke, E. Richard, Fundamentals of thermodynamics, John
Wiley & Sons, Inc, United States, 2009.
[32] I. Dincer, M. A. Rosen, Exergy: energy, environment and sustainable
development, Newnes, 2012.
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analysis of a steam power plant: A case study, International Journal of
Energy Research 33 (5) (2009) 499–512.
[34] S. N. Naserabad, K. Mobini, A. Mehrpanahi, M. Aligoodarz, Exergyenergy
analysis of full repowering of a steam power plant, Frontiers in
Energy 9 (1) (2015) 54–67.
[35] TU Delft, Postbus, Delft, The Netherlands, Cycle-Tempo Manual,
"Technical notes", Cycle-Tempo release 5.0- A program for thermodynamic
modeling and optimization of energy conversion systems
(2017).
Published
2018-12-29
How to Cite
AHMADI SHEIKH SHABANI, Gholamreza et al.
Performance assessment and leakage analysis of feed water pre-heaters in natural gas–fired steam power plants.
Journal of Power Technologies, [S.l.], v. 98, n. 4, p. 352–364, dec. 2018.
ISSN 2083-4195.
Available at: <https://papers.itc.pw.edu.pl/index.php/JPT/article/view/1329>. Date accessed: 19 apr. 2024.
Issue
Section
Power Plant
Keywords
Thermal power plants, Rankin cycle, Efficiency improvement, Feed water heater, Technical analysis, External leakage.
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