Plant / Facility:
Conventional power industry, turbopump condenser of 500 MWe unit
Losses were observed due to the presence of an above-normal amount of operating sludge on the heat exchange surfaces of the turbopump condenser, which very significantly affected the overall efficiency of the power unit.
In addition to hard mining sludge, high levels of biological contamination were observed, resulting from the use of river water for cooling.
Carry out chemical cleaning using active foam with solutions that are safe for the construction material (Brass, CuZn20AlF40 alloy) from which the condenser tubes were made.
The condenser was separated from the system using specially designed plugs installed in the cooling water outlet pipelines and plugs in the case of the cooling water inlet pipelines. Each half of the capacitor was cleaned separately.
The directions of foam flow through the piping system were changed during the process to homogenize the physicochemical conditions in the exchanger. The cleaning and neutralization process took a total of 8 hours. The amount of waste generated was 8.5 m3.
Optimal heat transfer parameters through the condenser were achieved, and the overall efficiency of the power unit increased to the expected level. The results of the cleaning performed are illustrated in the photos below.
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