The cleaning technology of two new build supercritical units in Datang Xiangtan power plant was introduced.By economic and technology comparison

alkali washing

citric acid cleaning

and hydrogen peroxide passivation cleaning technology were used to wash front furnace and boiler proper in series

passivation effect was excellent.Water consumption during the first ignition and blowpipe was reduced and iron content in water-steam system was low

meanwhile time required was short.Cleaning technology was proved to be feasible and the cleaning quality was superior.