Steam turbine exhaust steam moisture on-line measurement device

Abstract

The invention relates to an on-line measuring device for humidity of exhaust steam from a steam turbine, which belongs to the technical field of testing and is used for solving the problem of on-line detection of steam humidity. The technical solution is that it consists of a microwave resonance sensor, a resonance frequency detection circuit, a single-chip microcomputer and a display. The microwave resonance sensor is placed in the steam turbine exhaust cylinder, and its microwave signal transmission interface is connected to the resonance frequency detection circuit through a waveguide. The resonance frequency The control terminal and output terminal of the detection circuit are connected to different pins of the single-chip microcomputer, and the display is connected to the PORT1 interface of the single-chip microcomputer. Compared with the existing measuring device, the present invention not only greatly simplifies the structure and greatly reduces the manufacturing cost, but also has very simple operation and high measurement precision, and is especially suitable for on-line detection of steam turbine exhaust steam humidity at the engineering site.

Description

technical field [0001] The invention relates to a device capable of performing high-precision on-line detection of the exhaust steam humidity of a steam turbine, belonging to the technical field of testing. Background technique [0002] The steam humidity has an important influence on the safety and economy of the steam turbine, so it is necessary to monitor the exhaust steam humidity of the steam turbine on-line. At present, the methods for measuring the humidity of steam turbine exhaust can be divided into thermodynamic methods and optical methods. [0003] The principle of the thermodynamic method is to extract a sample of a certain mass from the exhaust steam of the steam turbine, heat or condense the sample, and calculate the humidity of the exhaust steam of the steam turbine by measuring the heating or heat release. All thermodynamic methods need to take part of the sample from the steam turbine exhaust steam flow when measuring the humidity of the steam turbine exhau...

AI Technical Summary

Problems solved by technology

One of the keys to the success of the optical method is to keep the optical window clean. At present, warm air is generally used to keep the surface of the window from contact with oil and water. However, the optical window is exposed to the measurement air flow for a long time, and it is difficult for the surface to be polluted. avoid, which largely limits its practical application

[0005] In short, the existing steam humidity measurement methods and their measurement devices have serious deficiencies. Designing a steam humidity measurement device with simple structure, strong environmental adaptability, low manufacturing cost, and excellent performance will help improve the safety and economy of steam turbines. sex is necessary

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