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Determination method of steam turbine generator unit exhaust enthalpy

A technology for turbogenerators and turbogenerators, applied to measuring devices, measuring heat, instruments, etc., can solve problems such as the inability to calculate exhaust steam enthalpy, difficult on-line monitoring of steam turbine thermal tests, lack of turbogenerators, etc. Achieve the effect of convenient online monitoring, meeting engineering needs, and high precision

Active Publication Date: 2014-07-30
STATE GRID CORP OF CHINA +2
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Problems solved by technology

Due to the lack of an effective method for measuring the exhaust steam humidity of the steam turbine generator, the exhaust steam enthalpy cannot be calculated, and it is difficult to effectively carry out the steam turbine thermal test and online monitoring

Method used

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  • Determination method of steam turbine generator unit exhaust enthalpy

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Embodiment 1

[0053] Detection example: NZK600-24.2 / 566 / 566 supercritical, three-cylinder four-exhaust, one-time intermediate reheat, single-shaft, direct air-cooled steam turbine generator set was tested, and its effective parameters are mainly steam pressure and temperature It is 24.2MPa, 566°C; the reheating temperature is 566°C.

[0054] The exhaust enthalpy of the turbogenerator unit is determined according to the following method, and the detection data and test results are shown in Table 1.

[0055] Step 1: Calculation of the power in the low-pressure cylinder of the turbogenerator.

[0056] A: Read the electric power of the turbogenerator, and calculate the mechanical loss of the turbogenerator according to the mechanical efficiency of the turbogenerator ( △P m ), according to the turbogenerator loss curve to read the turbogenerator power generation loss ( △ P g ), according to the formula (1) to calculate the output internal power of the turbogenerator ( P i ),

[0057] P ...

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Abstract

The invention relates to a determination method of steam turbine generator unit exhaust enthalpy. By computing steam turbine generator low-pressure cylinder inner power and steam turbine generator low-pressure cylinder ideal inner power, steam turbine generator exhaust enthalpy is determined finally. According to the exhaust enthalpy determination method, measuring of steam turbine last-stage moisture is avoided, computing of a low-pressure cylinder in a wet steam zone does not need to be considered, especially under low loading, dropping of the wet steam zone of the low-pressure cylinder is expanded, and great convenience is provided for economical on-line monitoring of a condensing steam turbine. Exhaust enthalpy accuracy is high, the absolute error is 1.194%, and engineering requirement can be met.

Description

technical field [0001] The invention relates to the field of parameter measurement of a turbogenerator set, in particular to a method for measuring exhaust steam enthalpy of a turbogenerator set. Background technique [0002] In thermal power plants, the exhaust steam of the steam turbine is in the wet steam area, the humidity of the exhaust steam cannot be directly determined by the state parameters, the enthalpy of the exhaust steam and the relative internal efficiency of the steam turbine cannot be directly determined, and the reasons for the breakage of the bundle-level blades and the formation of water erosion are also difficult. Analysis, judgment. Therefore, measuring and determining the humidity of the final stage of the steam turbine has long been an urgent problem to be solved in the online monitoring and fault diagnosis of large units. At present, there are about 70 kinds of non-destructive testing techniques, among which laser method, optical method and microwav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K17/06
Inventor 李琼张营闫晓沛郝青哲
Owner STATE GRID CORP OF CHINA
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