Diagnosis method for detecting ageing symptoms in a steam turbine
First Claim
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1. A diagnostic method for the detection of aging phenomena in a steam turbine, comprising:
- calculating efficiency of the steam turbine from measurements of state variables of the steam turbine at a first time point and at a relatively later second time point at a plurality of operating points of the steam turbine, wherein an operating point is determined by a value of parameters including at least one of circumferential Mach number, pressure number and inlet valve position; and
determining an extent of the aging of the steam turbine from a change in the efficiency calculated at the first time point to the efficiency calculated at the second time point as a function of the operating point.
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Abstract
A diagnosis method is for detecting ageing symptoms in a steam turbine. The efficiency and the steam flow rate of an aged steam turbine is compared to the efficiency and the steam flow rate of a relatively new steam turbine. The efficiency and the steam flow rate are calculated using readings at several operating points on the steam turbine. The time history of the efficiency and steam flow rates applied in contrast to parameters such as the peripheral. Mach number, pressure figure and adjustment of the inlet valve provide information on the extent of ageing of the steam turbine.
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8 Claims
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1. A diagnostic method for the detection of aging phenomena in a steam turbine, comprising:
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calculating efficiency of the steam turbine from measurements of state variables of the steam turbine at a first time point and at a relatively later second time point at a plurality of operating points of the steam turbine, wherein an operating point is determined by a value of parameters including at least one of circumferential Mach number, pressure number and inlet valve position; and
determining an extent of the aging of the steam turbine from a change in the efficiency calculated at the first time point to the efficiency calculated at the second time point as a function of the operating point. - View Dependent Claims (2, 3, 4)
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5. A diagnostic method for the detection of aging phenomena in a steam turbine, comprising:
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calculating a steam throughput coefficient of the steam turbine from measurements of state variables of the steam turbine at a first time point and at a relatively later second time point at a plurality of operating points of the steam turbine, wherein an operating point is determined by a value of parameters at least one of circumferential Mach number, pressure number and inlet valve position; and
determining an extent of the aging of the steam turbine from a change in the steam throughput coefficient calculated at the first time point to the steam throughput coefficient calculated at the second time point as a function of the operating point. - View Dependent Claims (6, 7, 8)
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Specification