A probe and method for measuring moisture vapor humidity using a microwave hard coaxial cable

Abstract

The invention discloses a probe and method for measuring the humidity of wet steam by a rigid microwave coaxial line. The probe comprises a rigid coaxial line outer conductor, a sampling head, an end part connecting piece, an outer sleeve pipe, a rear end cover, a flow guide pipe, an adjusting valve, vacuum pumping equipment, a T-shaped positioning bracket, a ceramic sleeve pipe, a rigid coaxial line inner conductor, a microwave source, a microwave power meter, a porous corundum bar, a rigid coaxial line terminal resistor and a data acquisition system. The probe can accurately measure the humidity of the wet steam.

Description

technical field [0001] The invention relates to a wet steam humidity measuring probe and method, in particular to a wet steam humidity measuring probe and method using a microwave hard coaxial line. Background technique [0002] As a working medium, wet steam is widely used in various engineering practices, especially in the field of power engineering. For example, in a steam turbine, flowing wet steam not only causes a decrease in unit efficiency, but also causes water erosion to the cylinder and blades. Measuring the humidity of the flowing wet steam in the steam turbine (especially the humidity of the exhaust steam) is an important content of the thermal test of the steam turbine, and it is also an important basis for evaluating the performance of the unit and improving the design of the unit. [0003] The methods of humidity measurement in steam turbines are mainly thermal method and optical method. The thermodynamic method cannot measure the particle size of water dro...

AI Technical Summary

Problems solved by technology

The use of electric heating has disadvantages such as low heat transfer efficiency, long heating section, many links for heat dissipation and thermal inertia, difficulty in accurate measurement of heating capacity, and easy damage to heating elements, so that the humidity of wet steam cannot be accurately measured.

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