Abstract: During the operation of the cracking compressor of an ethylene plant with an annual output of 1.1 million tons, the output power of the turbine has been continuously decreased and the load of the plant has been severely limited. In this paper, the causes of the power reduction of the turbine are analyzed. The comprehensive technical scheme of on-line cleaning agent filling and saturated steam cleaning is adopted for the large-scale twin-cylinder turbine unit and the turbine power of the cracking compressor is restored completely. This technical scheme is the first application in the industry and can provide a reference for on-line treatment of turbine power decrease in large-scale units.

Key words: ethylene plant, turbine, output power decrease, on-line cleaning