The design and operating conditions of the low-pressure circut of Ep-258/310/35-15.0/3.14/0.44- 540/535/263 (P-132) heat-recovery steam generator (HRSG) as part of 795 MW CCGT were studied to reduce the wear of its tubes. Reliable and effective operating conditions of the natural-circulation loop are presented. The design of the low-pressure loop of P-132 is described. Modifications of the operating conditions to reduce the velocity of steam-water mixture in the natural-circulation loop, which, in turn, reduces the flow-accelerated corrosion, are described. In particular, the effect of changes in the drum pressure at constant and variable feedwater temperature on the velocity of the steam-water mixture is described. Methods and designs for eliminating gas shunts to equalize the heat absorption by the evaporator tubes in the HRSG are proposed. Several modifications of the HRSG design intended to reduce flow-accelerated corrosion are considered: a new evaporator design with outlet bends replaced with straight tubes; a new design of the riser system with more independent movement of the mixture from the evaporator; a different longitudinal spacing of evaporator tubes. The combined effect of modifications to the design and operating conditions on the reliability of the low-pressure loop is studied. It is concluded that the optimal solutions to reduce flow-accelerated corrosion are to increase the pressure in the low-pressure drum, to redesign the outlet section of the low-pressure evaporator and the low-pressure riser system, and to install anti-shunt partitions in the heating surfaces. These measures will allow steel 20 to be used to manufacture evaporation and riser tubes of the low-pressure loop due to the reduction of the velocity of steam-water mixture.
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References
K. A. Pleshanov, R. S. Maslov, V. S. Pankov, K. V. Sterkhov, and D. A. Khokhlov, “Investigation into factors causing damage to low-pressure loop evaporating tubes of large-capacity heatrecovery steam generators,” Therm. Eng., 67(8), 543 – 553 (2020), DOI: https://doi.org/10.1134/S0040363620080032
K. A. Pleshanov, K. A. Pleshanov, K. V. Sterkhov, and M. N. Zaichenko, “Calculating the dynamic characteristics of a boiler-utilizer at the Novogor’kovskaya heat and electric power plant,” Power Technol. Eng., 49(3), 206 – 211 (2015).
K. A. Pleshanov, K. V. Sterkhov, and P. V. Roslyakov, “Stability of natural circulation in a vertical boiler-utilizer loop with horizontal evaporator pipes during startup,” Power Technol. Eng., 50(4), 407 – 412 (2016).
V. S. Pankov and E. A. Smirnov, “Methods to combat the causes of damage to the steam-forming pipes of the low-pressure circuit in CCPP heat recovery steam generators,” Power Technol. Eng., 52(6), 698 – 702 (2019).
V. I. Nikitin, I. I. Belyakov, and V. I. Breus, “Damage to steamgenerating tubes of low-pressure circuit of drum-type heat recovery boiler used in the PGU-450 combined-cycle unit at Severozapadnaya cogeneration plant,” Therm. Eng., 56(2), 124 – 128 (2009).
K. A. Pleshanov, E. G. Khlyst, M. N. Zaichenko, and K. V. Sterkhov, “Design of a natural circulation circuit for 85 MW steam boiler,” Therm. Sci., 21(3), 1503 – 1513 (2017), DOI: https://doi.org/10.2298/TSCI161005320P
N. S. Galetsky and A. L. Scwartz, “Features of erosion-corrosion wear in low-pressure evaporators of combined-cycle plant heat-recovery boilers at high void factor values,” Therm. Eng., 60(12), 917 – 920 (2013), DOI: https://doi.org/10.1134/S0040363613120084
Standard Instructins RD 24.035.05–89. Thermal and Hydraulic Design of Heat-Exchange Equipment of NPPs [in Russian], NPO TsKTI, St. Petersburg (1989).
D. Moelling, J. Malloy, M. Graham, M. Taylor, and A. Fabricius, “Design factors for avoiding FAC erosion in HRSG low pressure evaporators,” in: Proc. ASME 2013 Power Conf. POWER-2013 (July 29 – August 1), Boston, MA, USA (2013).
V. A. Lokshin, D. F. Peterson, and A. L. Schwartz, Hydraulic Design of Boiler Units (Standard Method) [in Russian], Énergiya, Moscow (1978).
V. L. Eriksen (ed.), Heat Recovery Steam Generator Technology, Woodhead Publishing, an imprint of Elsevier (2017), print ISBN: 978-0-08-101940-5; online ISBN: 978-0-08-101941-2.
J. B. Kitto and S. C. Stultz (eds.), Steam, Its Generation and Use, The Babcock & Wilcox Company, Barberton, OH, USA (2005).
Thermal Design of Boilers (Standard Method) [in Russian], NPO TsKTI, St. Petersburg (1998).
C. Daublebsky von Eichhain, “Verbesserung des Betriebes von Kraftwerken Durch Einsatz Eines Simulation Swerkzeugs, Software Package for Design of Heat-Power Equipment,” in: Proc. Int. Sci.-Appl. Conf. on Boiler Designer-2014, Torus Press, Moscow (2014), pp. 83 – 96.
K. A. Pleshanov, K. V. Sterkhov, D. A. Khokhlov, and M. N. Zaichenko, “Design recommendations development for vertical heat recovery steam generations with natural circulation,” Euroheat and Power, 16(1), 12 – 17 (2019).
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Translated from Élektricheskie Stantsii, No. 1, January 2021, pp. 9 – 20. DOI: 10.34831/EP.2021.1074.1.002
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Maslov, R.S., Pleshanov, K.A., Pankov, V.S. et al. Search for a Solution to the Problem of Flow-Accelerated Corrosion in Heat-Recovery Steam Generators. Power Technol Eng 55, 233–243 (2021). https://doi.org/10.1007/s10749-021-01346-8
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DOI: https://doi.org/10.1007/s10749-021-01346-8