Method and device for measuring steam humidity and diameter of water droplet of non-contact type turbine
A technology of water droplet diameter and steam humidity, applied in measurement devices, measurement of scattering characteristics, and optical devices, etc., can solve problems such as high requirements for measurement equipment and environment, interference of measured airflow, etc., and achieves fast measurement speed, low cost, The effect of high measurement accuracy
Inactive Publication Date: 2011-12-21
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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However, the above method also has deficiencies: 1. The measuring head of the probe still needs to be placed in the air flow, which still has a certain interference effect on the air flow to be measured. High, these will produce certain errors in the measurement process; 2. The probe method can only measure parameters such as steam humidity and particle diameter distribution at one point or line of the steam turbine stage, and there are certain limitations
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[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0029] like figure 1 and figure 2 Shown, the present invention is a kind of method that adopts laser scattering theory and CCD technology to combine, to measure steam turbine last stage steam humidity and water drop particle diameter, in the present embodiment the specific steps of the present invention method are:
[0030] ①. Calibration: Before the measurement, the CCD camera 2 is first calibrated multiple times, and the average value of multiple calibrations is used to determine the average scale factor of the CCD camera 2. The calibration system is as follows: image 3 shown;
[0031] ②. Installation: Fix the laser 1 and the CCD camera 2 respectively on the precision two-dimensional turntable 3 on both sides of the observation window 4 of the low-pressure cylinder of the steam turbine, so that the angle between the incident lig...
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The invention discloses a method and a device for measuring the steam humidity and diameter of a water droplet of a non-contact type turbine. The method comprises the following steps of: respectively arranging a laser device and a CCD camera at the two sides of an observation window of a lower pressure cylinder of the turbine, and fixing the laser device and the CCD camera on a two-dimensional rotary table so as to precisely adjust the included angle between the incidence light and the optical axis of the CCD; maintaining a certain angle between the incidence light and the optical axis of theCCD so as to separate a slight scattered light from the strong incidence light to ensure that the CCD camera can detect the weak scattered light signal; adjusting the included angle between the incidence light and the CCD and maintaining a certain angle; measuring the intensity of the scattered light of the laser to the steam within 0-10 degrees, and calculating the steam humidity and the diameter of water droplet in the lower pressure cylinder of the turbine according to the relevant knowledge of distribution of the light intensity, laser scattering theory and the like. The device comprises the laser device, the CCD camera, a computer and the two-dimensional rotary table. The invention has advantages of high degree of automation, high precision of measuring, wide application range, high efficiency of measurement, online measurement and the like.
Description
technical field [0001] The invention relates to the field of humidity measurement of flowing wet steam, in particular to a method for measuring steam humidity and water droplet diameter of a steam turbine. Background technique [0002] The existence of "steam humidity" not only reduces the operating efficiency of the steam turbine unit, but also causes serious water erosion of the blades, which brings great harm to the economy and safety of the steam turbine unit. Therefore, the measurement of parameters such as the diameter and concentration of water droplets is an urgent problem to be solved in the problem of wet steam and the operation control of power plant units. [0003] In recent decades, the research on steam humidity measurement technology has gradually been paid attention to. Since the 1970s, the research on steam humidity measurement technology has made great progress. The main measurement technology methods are: thermodynamic method, optical method, tracer and C...
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IPC IPC(8): G01N21/51G01N21/01G01B11/08
Inventor 黄竹青曹小玲
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY