Abstract: The synchronized online chamecial cleaning of 3×390MW units circulating water system was implemented by using the chamecal online cleaning technology, in which the Y-CH107 cleaning agent was used, the integrated biofouling removal, cleaning and passivation processes were adopted. The cleaning process did not influence units generation, the pH value was controled in range 4 to 5. Then the corrosion rates of materials in the system were controled effectively. Taking the 3×390MW combined gas and steam turbine units of Hangzhou Huadian Banshan Generation Corporation Limited as examples, the application, implement process and effect of circulating water system chamecal online cleaning technology were described briefly, and its economic benefit was analyzed.

Key words: synchronized on-line chemical cleaning, gas turbine generator set, circulating cooling water system, condenser fouling, cleaning plan, cleaning effect, economic benefit analysis