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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...

The state of the metal, oxide film, and sediments of shield (screen) pipes in the salt compartment of a TM-104A boiler operating with amine water treatment following damage by thermal bulges. It is shown that this damage is caused by excursions in the thermal flux onto components with high thermal resistance owing to sediments during firing. Recommendations are made for increasing operational reliability.This article discusses the damage to shield piping in the TM-104A boiler at the Shatura State Regional Electric Power Plant (Shaturskaya GRÉS) following its conversion to an amine water treatment regime.The TM-104A natural circulation boiler in generator unit No. 5 is equipped with twelve frontal burners positioned in two rows at elevations of 11 and 14 m, with six in each row. It ran 55.4% of the time on fuel oil and the rest of the time on natural gas. Before the last planned shutdown, it was run for several hours on fuel oil. The pressure in the drum during standard boiler operation was 15.2 MPa. The 60/48-mmdiameter shielding pipes were made of 20 steel. At the time of this study the total operating time for the shields was 177,735 h. The boiler was originally a operated with traditional ammonia-hydrazine-phosphate water treatment.As manufactured, the boiler had two salt compartments on the left and right sides. Each compartment consisted of two dust extractors, each with its own circulation loop of 18 shield pipes joined to the drum in series for water and in parallel for steam. Despite combining of the down pipes from the first and second dust extractors into a single collector, the evaporation of the boiler water was essentially a done in a three-stage configuration. The volume of the shield pipes for the salt compartments was 9% of the total volume of the boiler shields. Purging is carried out by the secondary dust extractors.After reconstruction in 2000, the volume of the salt compartments was reduced by a factor of 2, and the salt content of the boiler water in the second extractor on the left was the same as in the clean compartment, the salt concentrations in the first extractors on the left and right sides were equal, and the boiling down in the third stage of the right compartment was increased by a factor of 2. Purging was then carried out only by the second extractor on the right side.In September 2007, the generator unit was switched to an amine water regime using cetamine. Dispensing of the traditional regents was stopped after the switch. Preliminary acid cleaning of the heating surfaces to get rid of deposits was not done, since the contamination on the sections of the shield pipes to be studied was less than 400 g/m 2 . Operation with cetamine had been under way for 11,386 h at the time of the study.Cetamine is a complex reagent that includes neutralizing and film forming amines and a dispersant. The problems solved with the aid of cetamine and the traditional corrective processing of water are almost completely the same. Cetamine was dispensed into the feed water and the boiler drum through ...