Test method for obtaining flow characteristics of high pressure regulating valve of steam turbine

A technology of high-pressure valve adjustment and flow characteristics, which is applied in the testing of mechanical components, testing of machine/structural components, testing of mechanical valves, etc. Points and other problems, to ensure the accuracy of the measurement points, meet the test requirements, and facilitate inspection and processing

Active Publication Date: 2020-01-03
SHANGHAI MINGHUA ELECTRIC POWER TECH & ENG +1
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Problems solved by technology

[0004]1. Among all the stage groups of the steam turbine, the regulating stage has the highest steam inlet parameter and the fastest steam flow rate, and part of the steam inlet causes a large change in the flow field, so the regulating stage The pressure and temperature fluctuate greatly, and the representativeness of the measuring points is not good
[0005]2. Si

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  • Test method for obtaining flow characteristics of high pressure regulating valve of steam turbine
  • Test method for obtaining flow characteristics of high pressure regulating valve of steam turbine
  • Test method for obtaining flow characteristics of high pressure regulating valve of steam turbine

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Embodiment Construction

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0030] For a certain 1000MW coal-fired generating set, its matching steam turbine is equipped with four high-pressure regulating valves. Through the field test, the flow characteristics of the four high-pressure regulating valves are tested.

[0031] 1. Before the test, the unit exits the AGC and adjusts the frequency once, and the load is stable at 90% of the rated load;

[0032] 2. Coordinated control is switched to boiler following mode;

[0033] 3. F...

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Abstract

The invention relates to a test method for obtaining flow characteristics of a high pressure regulating valve of a steam turbine. According to the method, a first-level steam extraction parameter of ahigh pressure cylinder is used as a calculation basis of main steam flow, and the flow characteristics of the high pressure regulating valve of the steam turbine are obtained by calculating the variable quantity of the main steam flow. Compared with the prior art, the test method provided by the invention has the advantages of better representative measuring points, installation at the outside the cylinder, convenient for inspection and processing, capability of ensuring the accuracy of the measuring points, and so on.

Description

technical field [0001] The invention relates to a method, in particular to a test method for obtaining the flow characteristic of a steam turbine high-pressure valve. Background technique [0002] Steam turbines are generally designed with multiple regulating valves for flow control, and their flow characteristics are directly related to the stability and speed of power regulation. At present, the flow characteristic parameters of most steam turbine high-pressure valves are based on the design data provided by the manufacturer. After infrastructure debugging and production trial operation, they are corrected according to the actual situation and are set in the digital electric hydraulic control system of the steam turbine (Digital Electric Hydraulic control system, Hereinafter referred to as DEH). In view of limited manufacturing / installation conditions, wear / aging of valves, modification of flow passages, adjustment of steam distribution mode, and changes in equipment char...

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Application Information

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IPC IPC(8): G01M13/003
CPCG01M13/00
Inventor 王煦李志龙祝建飞高利平归一数刘福东张重帅江志敏
Owner SHANGHAI MINGHUA ELECTRIC POWER TECH & ENG
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