Results of Steam-Water-Oxygen Treatment of the Inside of Heating Surfaces in Heat-Recovery Steam Generators of the PGU-800 Power Unit at the Perm’ District Thermal Power Station
- Authors: Ovechkina O.V.1, Zhuravlev L.S.1, Drozdov A.A.1, Solomeina S.V.2
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Affiliations:
- All-Russia Thermal Engineering Institute
- AO InterRAO–Elektrogeneratsiya’s Branch Perm District Power Plant
- Issue: Vol 65, No 5 (2018)
- Pages: 324-329
- Section: Water Treatment and Water Chemistry
- URL: https://journals.rcsi.science/0040-6015/article/view/172992
- DOI: https://doi.org/10.1134/S0040601518050087
- ID: 172992
Cite item
Abstract
Prestarting, postinstallation steam-water-oxygen treatment (SWOT) of the natural circulation/steam reheat heat-recovery steam generators (HRSG) manufactured by OAO Krasny Kotelshchik was performed at the PGU-800 power unit of the Perm District Thermal Power Station (GRES). Prior to SWOT, steam-oxygen cleaning, passivation, and preservation of gas condensate heaters (GCH) of HRSGs were performed for 10 h using 1.3MPa/260°С/70 t/h external steam. After that, test specimens were cut out that demonstrated high strength of the passivating film. SWOT of the inside of the heating surfaces was carried out during no-load operation of the gas turbine unit with an exhaust temperature of 280–300°С at the HRSG inlet. The steam turbine was shutdown, and the generated steam was discharged into the atmosphere. Oxygen was metered into the discharge pipeline of the electricity-driven feed pumps and downcomers of the evaporators. The behavior of the concentration by weight of iron compounds and the results of investigation of cutout specimens by the drop or potentiometric method indicate that the steam-water-oxygen process makes it possible to remove corrosion products and reduce the time required to put a boiler into operation. Unlike other processes, SWOT does not require metal-intensive cleaning systems, temporary metering stations, and structures for collection of the waste solution.
About the authors
O. V. Ovechkina
All-Russia Thermal Engineering Institute
Author for correspondence.
Email: ovechkina.ov@mail.ru
Russian Federation, Moscow, 115280
L. S. Zhuravlev
All-Russia Thermal Engineering Institute
Email: ovechkina.ov@mail.ru
Russian Federation, Moscow, 115280
A. A. Drozdov
All-Russia Thermal Engineering Institute
Email: ovechkina.ov@mail.ru
Russian Federation, Moscow, 115280
S. V. Solomeina
AO InterRAO–Elektrogeneratsiya’s Branch Perm District Power Plant
Email: ovechkina.ov@mail.ru
Russian Federation, Dobryanka, Perm krai, 618740