Abstract
To analyze the unit performance degradation for top heater out-of-service operation condition, two calculation methods were introduced, that was the model based calculation method and the simplified variable operation condition analysis method. A 600MW sub-critical steam turbine unit with air cooled condenser was analyzed using the two introduced methods. It is shown that calculation data got can reflect the redistribution effect on steam flows of the turbine extractions and turbine internals due to the top heater out-of-service, and similar and close calculation results were got from the two methods, and both results were lower than result calculated using the commonly used equivalent enthalpy drop method.
Highlights
The Equivalent Enthalpy Drop Method is commonly used in the performance quantitative analysis of the steam turbine units
It is shown that calculation data got can reflect the redistribution effect on steam flows of the turbine extractions and turbine internals due to the top heater out-of-service, and similar and close calculation results were got from the two methods, and both results were lower than result calculated using the commonly used equivalent enthalpy drop method
In Ref [3], the impact of top heater out-of-service condition was calculated by the Variable Operation Condition Analysis Method and Matrix Method, and it was concluded that there was minor difference between the two calculated results
Summary
The Equivalent Enthalpy Drop Method is commonly used in the performance quantitative analysis of the steam turbine units. For the top heater out-of-service operation condition for the steam turbine unit, the quantitative analysis equation in [1] is widely used to determine the effect on unit performance. In Ref [3], the impact of top heater out-of-service condition was calculated by the Variable Operation Condition Analysis Method and Matrix Method (based on the small disturbance consumption), and it was concluded that there was minor difference between the two calculated results. To analyze the unit performance degradation for top heater out-of-service operation condition, two calculation methods are introduced, that is the Model-based Calculation Method and the Simplified Variable Operation Condition Analysis Method
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