Abstract: To raise the efficiency of the three casings of the turbine and reduce the unit heat rate are the main tasks for power generation cost control of power plant. The turbine steam sealing reformation process in Hunan Huadian Changsha Power Generation Corporation Limited was described in this paper. It is demonstrated by calculation that the excellent economical benefit has been obtained after the reformation.

Key words: honeycomb seal, energy conservation and consumption reduction, heat rate of unit