Diagnosis and analysis on abnormal steam extraction parameters of a 600MW supercritical unit

Abstract

Abstract: Abstract:A 600MW unit operates continuously for two years, and its HP steam extraction parameters deviated from the design value seriously. So the heat consumption rate of the unit increased greatly, which influenced on safe and economic operation of the unit vastly. By means of comparison of the operation data and the performance test results of the unit in different periods, considering the main steam flow, the operation parameters of the heaters and the variation of the pressure ratio of stages, the reasons of the abnormal HP steam extraction parameters were analyzed. The conclusion of the analysis is that there is scale formation in the flow path of the HP cylinder, and it was suggested to open the cylinder for maintenance. The result in this paper can be used as reference for safe operation and maintenance of steam turbine.

Key words: Keywords:600MW supercritical unit, high pressure steam extraction, diagnosis and analysis, pressure ratio of stages, scaling

XU Xing, HUANG Qilong, DAI Weibao. Diagnosis and analysis on abnormal steam extraction parameters of a 600MW supercritical unit[J]. Huadian Technology, 2014, 36(2): 51-52.

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Diagnosis and analysis on abnormal steam extraction parameters of a 600MW supercritical unit

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