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

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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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. Since the pressure measuring point of the regulating stage is drawn from the inside of the high-pressure cylinder, the probability of failure of the measuring pipeline is high, and once the pipeline is damaged, it can only be inspected after it is shut down for overhaul deal with

In addition, some steam turbine control stages do not have temperature measuring points

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