Abstract:

The steam sealing gap is a major factor influencing on the thermal efficiency and thermal economical performance of steam turbine, and its

adjustment method is especially important. The total process of semiinstalled cylinder steam sealing gap adjustment for the subcritical 600MW steam

turbine of Huadian International Zouxian Power Plant was expounded. Various factors influencing on the accuracy of semiinstalled cylinder steam sealing gap

adjustment were analyzed. The new technology of fullyinstalled cylinder steam sealing gap optimal adjustment was introduced. Based on experiment, a

satisfactory result of the 600MW turbine steam sealing gap optimal adjustment was obtained. The optimal adjustment scheme can provide a reference for

persons of the same profession.

Key words: steam sealing gap, semi-installed cylinder, fully-installed cylinder, optimal adjustment