A steam-water-oxygen treatment, passivation, and preservation (SWOT, P, and Pr) of the internal heating surfaces of TPP-110, P-210, and P-210A boilers for the 300-MW power-generating sets have been successfully introduced at the Novocherkassk State Area Power Station (SAPS). The condition of the treated heating surfaces of the boilers while in service or on stand-by was investigated to determine the required periodicity of the SWOT, P, and Pr under the service loads and existing water-chemical regime. Specific results of the investigation are presented.

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Studies conducted on two power-generating units at the Kharanorskaya SAPP relative to the steam-water-oxygen passivation, preservation, and partial cleaning of all boiler-heating surfaces, including the surfaces of the reheater, and passivation of the surfaces of the high-pressure heaters on the steam and water sides by the steam-oxygen method, as well as partial passivation, preservation, and cleaning of turbine blading are presented.The All-Russian Thermotechnical Institute, in conjunction with the Kharanorskaya SAPP, has introduced steamwater-, steam-, and water-oxygen cleaning, passivation, and preservation of the circuit of a TPE-216 boiler, the setting of a K-215-130 turbine, and the high-pressure heaters (HPH) with respect to both the steam and water sides of the Stage No. 1 and 2 power units.A very significant amount of industrial experience with both the prestart, and also in-service treatment of drum and straight-through boilers had been accumulated by the VTI at the time of the steam-water-oxygen cleaning, passivation, and preservation (SWOC, P, and Pr) of the power-generating units at the Kharanorskaya SAPP [1 -5]. A procedure, plan, and working program for the steam-water-oxygen cleaning, passivation, and preservation as applies to equipment of the SAPP were developed on the basis of this experience.The power-generating units at the Kharanorskaya SAPP were treated in stages. Initially, the external heating surfaces of the boiler, including the steam reheater, were subjected to SWOC, P, and Pr. To implement the latter, a temporary circuit was assembled for the feed of primary steam from the high-pressure superheater to the steam reheater beyond the turbine setting in order to eliminate the random escape of cleaning products. For this purpose, a special cofferdam was assembled for a 140/25 reduction-oxidation plant, and caps were installed on the steam lines for cold reheating after the high-pressure cylinder (HPC), and check valves of the medium-pressure cylinder (MPC).In addition, a circuit was assembled for oxygen feed to the run of the power unit, for which the following measures were taken:-the heating surfaces of the boiler were divided into four loops: the first was for the HPH with respect to the water side, and also the boiler economizer (BE), and the surfaces of the high-and low-pressure superheaters; the second, third, and fourth loops were for the boiler shielding system and the surfaces of the high-and low-pressure superheaters;-three oxygen lines were assembled to drain the submerged stand pipes of the boiler shielding system, and also in the line for periodic blow-through of the boiler's brine compartments;-an oxygen line was assembled in the common feedwater suction line of the feed pump for the power unit, and beyond the junction with the boiler feed; and, -oxygen lines were assembled into pairs of turbine bleed-offs for treatment of the steam space in the HPH.In addition, the following special preparatory operations were performed:-an oxygen reserve in the amount of 42 tons, and a sta...