Abstract: Turbine scaling was found simultaneously on the cracking gas compressor, propylene refrigeration compressor and ethylene refrigeration compressor in the 460kt/a ethylene plant at PetroChina Lanzhou Petrochemical Company due to lack of water quality control, resulting in a serious decline in the operating efficiency of turbines, and the plant was forced to reduce the production load. Two online wet steam purging was carried out to improve the operating conditions of the turbines, and the water quality of the boiler was strictly controlled to ensure the long period operation of the plant at high load, thus avoiding the large amount of material discharge due to the shutdown of ethylene plant for scaling treatment.

Key words: three key compressors；turbine scaling；wet steam purging