Abstract:

The scaling of steam turbine blade in compressor unit leads to many problems such as increased steam consumption, reduced work efficiency, increased pressure of wheel chamber and increased suction pressure of the first stage of compressor, and turbine blade scaling affects the safe, stable and economic operation of ethylene plant at full load. The reasons for turbine blade scaling are analyzed from the aspect of steam quality, the theory, method, process and results of online cleaning of steam turbine are introduced in detail, and the trends in wheel chamber pressure, conductivity of turbine condensate and concentrations of Na⁺, PO₄^3- and SiO₂ during the cleaning are revealed. Online cleaning technology can successfully solve the turbine blade scaling problem in compressor unit. Finally, the measures for controlling the steam quality are introduced.

Key words: steam turbine, blade scaling, wheel chamber pressure, online cleaning, steam quality