PL

Chemical active foam cleaning of steam turbine cooling water condenser

Plant / Facility:

Conventional power industry, turbopump condenser of 500 MWe unit

description of the customer’s problem

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.

proposed solution

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.

course of implementation

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.

View from inside the reversing chamber during the first foam filling of the condenser
View from inside the reversing chamber during the first foam filling of the condenser

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.

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