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Method for measuring steam humidity of steam turbine based on Mie scattering theory

A technology based on vapor humidity and scattering theory, which is applied in the measurement of scattering characteristics, and can solve the problems of immaturity, small measurement range, inability to achieve non-contact, real-time measurement, etc.

Inactive Publication Date: 2014-10-08
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Application Information

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Problems solved by technology

The measurement technology currently used is not mature enough, it interferes with the steam flow to a certain extent, the measurement range is small, and it cannot achieve the purpose of non-contact and real-time measurement

Method used

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  • Method for measuring steam humidity of steam turbine based on Mie scattering theory
  • Method for measuring steam humidity of steam turbine based on Mie scattering theory
  • Method for measuring steam humidity of steam turbine based on Mie scattering theory

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Embodiment Construction

[0073] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.

[0074] Such as figure 1 As shown, the implementation steps of the steam turbine steam humidity measurement method based on the Mie scattering theory in this embodiment are as follows:

[0075] 1) The laser beam is injected from the monitoring window of the steam turbine cylinder through the laser, and the scattered light distribution image of the water droplets in the cylinder is collected through the monitoring window through the camera with a telephoto lens, and the specified pixel in the scattered light distribution image is regarded as composed of water droplets For each scatterer, the measured scattered light intensity of each scatterer is o...

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Abstract

The invention discloses a method for measuring steam humidity of a steam turbine based on a Mie scattering theory. The method comprises the following steps: (1) allowing laser beams to come into a monitoring window of a steam turbine cylinder through a laser, acquiring a distribution image of scattered light, and acquiring the actual measured scattered light intensity of each scattering body based on the distribution image of the scattered light; (2) calculating theoretical scattered light intensity of each scattering body based on the Mie scattering theory, calculating least squares of the theoretical scattered light intensity and the actual measured scattered light intensity of each scattering body, and uniformly searching and finding the optimal parameters consisting of mass median radius, size distribution parameter and water droplet number density; (3) combining the optimal parameters to calculate a Rosin-Rammler function and the volume of liquid water droplets contained in unit volume; (4) calculating the steam humidity of the steam turbine. The method has the advantages of non-contact, wide range, accuracy, real-time property, high safety, high reliability and simplicity and convenience in use.

Description

technical field [0001] The invention relates to the technical field of humidity measurement of flowing wet steam, in particular to a steam turbine steam humidity measurement method based on Mie scattering theory. Background technique [0002] The steam turbine is a rotary prime mover that converts thermal energy into mechanical energy with steam as the working medium. It is one of the three major equipments in conventional thermal power plants and nuclear power plants. The reliability and economy of its operation are crucial to the safe and economical operation of the entire generating set have a decisive influence. There are many factors that affect the safe and economical operation of steam turbines, the most important of which are the steam humidity (the amount of water content) and the size and distribution of water droplets in the area where the final blades of the steam turbine are located. Operation experience shows that the last stages of low-pressure steam turbines...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/53
Inventor 黄竹青杨颖黄章俊丁涛许春山
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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