ANALYSIS AND TREATMENT OF ABNORMAL VARIATION FOR FIFTH STAGE EXTRACTION STEAM TEMPERATURE CONCERNING 200 MW STEAM TURBINE UNIT

The treatment for abnormal variation of the fifth stage extraction steam temperature concerning 200 MW steam turbine unit in Hebi Power Plant has been presented. Through various inspection and test, the cause leading to abnormal variation of fifth stage extraction steam temperature has been found to be the result of leakage from shaftpacking no.1 pushing the fifth stage extraction steam out, and correponding treatment for eliminating the said defect being carried out.