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Method for setting valve flow characteristic curve of steam turbine

A technology of valve flow rate and characteristic curve, which is applied in the field of steam turbines, can solve problems such as failure, and achieve the effect of saving time and high reliability

Inactive Publication Date: 2019-10-18
JILIN ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some even only change the characteristics of a single valve function, failing to start from the whole, and there is a risk of tuning failure

Method used

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  • Method for setting valve flow characteristic curve of steam turbine
  • Method for setting valve flow characteristic curve of steam turbine
  • Method for setting valve flow characteristic curve of steam turbine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0034] A method for setting the flow characteristic curve of a steam turbine valve, such as image 3 shown, including the following steps,

[0035] Step 1. Data collection

[0036] Through the test, the data of the steam turbine unit in single-valve operation and multi-valve operation are obtained, and the specific data include load, flow command, corrected flow command, main steam pressure, regulating stage pressure and high-profile door opening command;

[0037] Step 2. Setting and Judgment

[0038] Select the single-valve operating data obtained in step 1, according to the Friugel formula

[0039] In the formula, G 1 is the flow rate before the stage group changes working conditions, G is the flow rate after the stage group changes working conditions, P 01 P0 is the pressure before the step change working condition, P0 is the pressure after the step change working condition, calculate the actual steam flow, compare the actual steam flow and the flow command to be grea...

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Abstract

The invention discloses a method for setting a valve flow characteristic curve of a steam turbine and belongs to the technical field of steam turbines. An overlap function is calculated by using datain single valve operation of a unit to obtain a new valve flow curve, and the reliability of a new characteristic curve is verified by using the data obtained in sequence valve operation of the unit.According to the method, valve flow characteristic parameters of the steam turbine can be completely and specifically set, so that switching between single valve and sequence valves is smooth, steam flow change is gentle during switching, load fluctuation is small, segment temperature and vibration do not greatly change and safe and stable operation of the unit is ensured; the response rate of AGCis optimized and the primary frequency modulation effect is improved; the overlap of regulating valves is reduced to improve the economy of the unit; and computation is simplified by using MATLAB programming.

Description

technical field [0001] The invention belongs to the technical field of steam turbines, in particular to a method for setting the flow characteristic curve of a steam turbine valve. Background technique [0002] The valve flow characteristic is the corresponding relationship between the valve opening and the steam flow through the valve. If the valve flow characteristic curve of the steam turbine differs greatly from the actual valve flow characteristic, there may be problems of sudden load change and slow adjustment during unit variable load and primary frequency regulation, resulting in difficulty in unit control, affecting unit safety and variable load capacity, and bringing certain economic loss. [0003] Most of the existing setting methods are based on the experience of technicians based on the data in the operating state of the sequence valve of the unit. The workload is heavy and the requirements for technicians are high. Some even only change the characteristics of...

Claims

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Application Information

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IPC IPC(8): G01M13/00G01M13/003
CPCG01M13/00G01M13/003
Inventor 李佳司瑞才王松寒王忠言夏志王春玲黄振群耿娜李茹艳金春林刘希闻姚卓宏周驰
Owner JILIN ELECTRIC POWER RES INST
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