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A method for selecting the last stage blade of a steam turbine

A technology of last stage blades and steam turbines, which is applied in the field of selection of last stage blades of steam turbines, can solve the problems of low number of hours, no consideration of changes in unit back pressure, large changes in operating load, etc. Small difference between economic performance and design economic performance, and the effect of improving economic performance

Active Publication Date: 2019-01-18
GUODIAN NANJING ELECTRIC POWER TEST RES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. The traditional method is to select the last-stage blades of the steam turbine based on the principle of obtaining the minimum guaranteed heat consumption rate of the steam turbine THA under the rated load and rated back pressure conditions of the unit. Operating economy under back pressure conditions
[0006] 2. The current utilization hours of thermal power units are low, the operating load changes greatly, and the actual operating back pressure differs greatly from the design back pressure. Especially when the operating load of the unit decreases, the actual operating back pressure also decreases accordingly, which is not as assumed by traditional methods. The rated back pressure value is still used as
The variable load economy of the steam turbine is greatly affected by the characteristics of the final stage blades of the steam turbine. The traditional final stage blade selection method has been unable to take into account the economy under low and medium load conditions, and has not considered the change of the actual operating back pressure of the unit.
[0007] So far, no case has been found that considers the actual operating conditions of the steam turbine blade selection method for the last stage of the steam turbine or can combine the actual load, actual back pressure and the selection method well

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  • A method for selecting the last stage blade of a steam turbine
  • A method for selecting the last stage blade of a steam turbine
  • A method for selecting the last stage blade of a steam turbine

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Embodiment 1

[0038] The technical solutions of the present invention will be further described below in conjunction with specific implementation examples.

[0039] Such as figure 1 As shown, the present invention includes a data acquisition module, a data processing module, a working condition data storage module, a heat consumption rate calculation module, a weighted heat consumption rate determination module and a last-stage blade selection module. Among them, the data acquisition module collects historical data from the SIS system of the unit at a certain acquisition frequency, and transmits the data to the data processing module; the data processing module sorts and calculates the historical data according to the algorithm, and counts different working conditions according to the historical data of the unit operation The unit back pressure (i.e. the average back pressure), the unit load (i.e. the average unit load) and the annual operating hours are calculated and processed to form a w...

Embodiment 2

[0041] The method for selecting the type of the last stage blade of the steam turbine in this embodiment, the specific process is as follows:

[0042] Such as figure 2 As shown, first, the data acquisition module retrieves the historical operation data of the past three years from the SIS system of the unit, and collects relevant parameters. The parameters to be collected are shown in Table 1. The sampling period of the historical operation data is 15 minutes, as 3 years of data samples.

[0043] Table 1 Data Acquisition Parameter Table

[0044] serial number

parameter name

unit

1

unit load

MW

2

Unit back pressure

kPa

[0045] After data collection, a large number of data samples formed are transmitted to the data processing module, and the data processing module performs calculation and processing on all data samples. The calculation and processing method is as follows:

[0046]Based on the unit load data in each data samp...

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Abstract

The invention relates to a method for selecting the last stage blades of a steam turbine. According to the historical operation data of the steam turbine, the method counts the back pressure of the steam turbine, the load of the steam turbine and the number of the annual operation hours under different working conditions. Then according to the design boundary conditions and the turbine design principle, the heat rate of each last stage blade under different load and different back pressure is calculated, and the weighted heat rate of each last stage blade is obtained. Finally, by comparing theweighted heat rates of the last stage blades, the last stage blades corresponding to the lower heat rates are selected as the final selection blades. The invention maximizes the economic performanceof the full load condition of the thermal power unit in consideration of the actual operating load and the corresponding actual operating back pressure distribution of the thermal power unit.

Description

technical field [0001] The invention relates to a type selection method for the last stage blade of a steam turbine, which belongs to the technical field of steam turbine generator sets. Background technique [0002] The clean and efficient utilization of coal is of great significance to my country's energy strategy. Power generation is the main aspect of clean and efficient utilization of coal. As one of the main equipment of the generator set, the economic performance of the steam turbine has a great influence on the economy of the whole generator set. [0003] At present, in recent years, wind power, hydropower, solar power and other new energy power generation have been connected to the grid on a large scale. It is impossible for thermal power units to operate in high-load areas for a long time, and the peak-shaving tasks of units are becoming more and more frequent. The lower the load, the higher the heat rate of the steam turbine and the worse the economic performanc...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F2119/08G06F30/17G06F30/20G06F2119/06
Inventor 谭锐徐星杨希刚蔡培张云华马晓峰王子谦
Owner GUODIAN NANJING ELECTRIC POWER TEST RES CO LTD