Test method for steam internal leakage quantity of low-pressure bypass valve of thermal generator set

Abstract

A test method for steam internal leakage quantity of a low-pressure bypass valve of a thermal generator set comprises the following steps of (1) selecting a set load for performing internal leakage test on a bypass voltage of a low-pressure cylinder; (2) determining a boundary condition of experiment; (3) obtaining steam parameter change conditions of a low-pressure bypass system before and afterdesuperheating water flow change by changing bypass desuperheating water flow of the low-pressure cylinder; (4) recording an experiment parameter of each working condition point, and forming originalexperiment data; and obtaining internal leakage steam flow of the low-pressure bypass valve by calculation. An energy balance, mass balance and same boundary loss item offset method is employed, the internal leakage steam flow of the low-pressure bypass valve of the thermal generator set is obtained by accurate and quantitative calculation of experiment, quantitative analysis and calculation is performed for the low-pressure bypass valve of the thermal generator set when internal leakage occurs, and the most direct data support is provided for power plant running economy and maintenance operation of the low-pressure bypass valve of a power plant.

Description

technical field [0001] The invention belongs to the technical field of thermal power generator unit testing, in particular to a method for testing the steam internal leakage of a low pressure bypass valve of a thermal power generator unit. Background technique [0002] Due to the needs of start-up and warm-up of large-scale thermal power generating units, low-pressure bypass systems with different capacities are designed in the steam turbine thermal system. The low-pressure bypass valve in the low-pressure bypass system has a large door core diameter, a large contact area, high working pressure and high temperature, and is required to be frequently used during the startup and shutdown of the steam turbine. Therefore, low-pressure bypass valves are often lax due to thermal deformation of the door core, thermal deformation of the valve seat, valve stroke control deviation, and erosion of the valve core, resulting in internal leakage of the low-pressure bypass valve. How to ac...

AI Technical Summary

Problems solved by technology

Therefore, low-pressure bypass valves are often lax due to thermal deformation of the door core, thermal deformation of the valve seat, valve stroke control deviation, and erosion of the valve core, resulting in internal leakage of the low-pressure bypass valve.

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