Online steam turbine exhaust humidity measuring system and method based on acoustics

Abstract

The invention belongs to the technical field of the online monitoring of steam turbine exhaust humidity, and in particular relates to an online steam turbine exhaust humidity measuring system and an online steam turbine exhaust humidity measuring method based on acoustics. The online steam turbine exhaust humidity measuring system comprises an industrial personal computer, a sound card, a junction box, a power amplifier, an electric sound source, a sound wave sensor, a temperature sensor, a pressure sensor, a signal conditioner, a data acquisition card and a display. By utilizing the principle that sound velocity is changed as the variation of the steam humidity, the steam humidity is calculated by measuring the sound velocity of wet steam and corresponding parameters of the wet steam such as temperature, pressure, so that the requirement for online measuring the last-stage exhaust humidity of a steam turbine can be met; the electric sound source, the sound wave sensor, the temperature sensor and the pressure sensor are highly integrated to form an acoustic probe to be arranged in a last-stage outlet of the steam turbine, so that the online steam turbine exhaust humidity measuring system is convenient to use and high in reliability, avoids the influence of the size of water drops in the steam turbine, does not need the sampling, is sensitive in reaction, can measure the steam humidity in real time and is particularly suitable for measuring the last-stage exhaust humidity of the steam turbine.

Description

technical field [0001] The invention belongs to the technical field of on-line monitoring of steam turbine exhaust humidity, and in particular relates to an acoustic-based online measurement system and method of steam turbine exhaust humidity. Background technique [0002] The steam humidity has an important influence on the safety and economy of the steam turbine, and the steam humidity changes with the change of the load. Therefore, the on-line measurement of steam turbine exhaust humidity is of great significance. At present, the methods that can really be used to measure the humidity of steam turbine exhaust include thermodynamic method and optical method. [0003] The basic principle of the thermodynamic method is to take a sample from the exhaust steam of the steam turbine and process it so that it changes from a two-phase flow to a one-way flow. According to energy conservation and mass conservation, reverse calculation is carried out to obtain the sample humidity. ...

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Problems solved by technology

The optical window is exposed to the measurement airflow for a long time, and the surface is easily polluted and difficult to clean, which largely limits its practical application

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