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Method for calculating efficiency of low-pressure cylinder of thermal power plant steam turbine

A low-pressure cylinder and steam turbine technology is applied in the field of calculating the efficiency of a low-pressure cylinder of a steam turbine in a thermal power plant, which can solve the problems of low accuracy, few points, and difficulty in ensuring accuracy, and achieves the effects of computational science, simple operation, and high computational accuracy.

Active Publication Date: 2017-01-04
HUADIAN ELECTRIC POWER SCI INST CO LTD
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  • Application Information

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Problems solved by technology

This calculation method takes fewer points and the accuracy is not high, especially when the steam turbine is operating at low load, the number of steam extraction points in the wet steam state increases, and it is even more difficult to ensure the accuracy

Method used

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  • Method for calculating efficiency of low-pressure cylinder of thermal power plant steam turbine
  • Method for calculating efficiency of low-pressure cylinder of thermal power plant steam turbine
  • Method for calculating efficiency of low-pressure cylinder of thermal power plant steam turbine

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Embodiment Construction

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are explanations of the present invention and the present invention is not limited to the following examples.

[0026] Example.

[0027] see figure 1 , the steps of the method for calculating the efficiency of the low-pressure cylinder of the steam turbine in the thermal power plant in this embodiment are as follows.

[0028] 1) Calculate the extraction pressure from high to low, assuming that the first extraction point in the wet steam state is i, then calculate the enthalpy values ​​h of extraction points i-1 and i-2 based on the pressure and temperature obtained from the performance test i-1 、h i-2 , entropy value s i-1 , s i-2 and other parameters, and calculate the section efficiency μ of i-2~i-1 i-2～i-1 . The specific method is as follows: According to s i-2 ,P i-1 Obtain the ideal enthalpy value h' correspondin...

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Abstract

The invention relates to a method for calculating the efficiency of a low-pressure cylinder of a thermal power plant steam turbine. The conventional method for calculating the efficiency of the low-pressure cylinder at present is low in precision. The method comprises the following steps: (1) calculating steam extraction pressure from high to low, supposing that a first steam extraction point in a wet steam state is i, calculating enthalpy values and entropy values of the steam extraction points i-1 and i-2 according to pressure and temperature which are acquired by a performance test, and calculating section efficiency [mu](i-2 to i-1) of i-2 to i-1; (2) supposing that the efficiency reduction coefficient is a, i.e. the section efficiency [mu](i-2 to i-1) of i-2 to i-1 is [mu]i-1 to i= a*[mu](i-2 to i-1); (3) calculating an actual enthalpy value of the point i; (4) calculating the steam discharging enthalpy h(steam discharging) of the low-pressure cylinder; (5) calculating the steam discharging leaving velocity loss V(leaving velocity loss) of the final stage; (6) calculating an enthalpy value UEEP of the unit mass of steam discharged by the low-pressure cylinder; and (7) calculating the efficiency of the low-pressure cylinder. The method is easy to operate and high in calculation precision.

Description

technical field [0001] The invention relates to a method for calculating the efficiency of a low-pressure cylinder of a steam turbine in a thermal power plant, and can also obtain the thermal parameters of the wet steam extraction section of the low-pressure cylinder. Background technique [0002] Large-scale steam turbines generally have high-pressure cylinders, medium-pressure cylinders and low-pressure cylinders. The efficiency of each cylinder reflects the performance of the steam turbine itself and is an important indicator to express the performance of the steam turbine. [0003] For high-pressure cylinders and medium-pressure cylinders, only the pressure and temperature of the inlet and outlet of each cylinder can be obtained to obtain other relevant parameters, and then calculate the efficiency of the cylinder. As for the low-pressure cylinder, since its exhaust steam is wet steam, in order to obtain the exhaust steam enthalpy, in addition to the exhaust steam pressu...

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Application Information

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IPC IPC(8): G06F19/00F01D15/00
CPCF01D15/00G16Z99/00
Inventor 张佳佳
Owner HUADIAN ELECTRIC POWER SCI INST CO LTD
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