Flowing wet vapor humidity measurement probe based on microwave heating and measurement method thereof

A flow wet steam and humidity measurement technology, which is applied in the direction of material moisture content, can solve the problems of difficult accurate measurement of heating capacity, long heating section, and easy damage of heating elements, so as to reduce heat dissipation and thermal inertia, and improve Measurement accuracy, effect of reducing heat dissipation

Inactive Publication Date: 2014-07-23
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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,

Method used

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  • Flowing wet vapor humidity measurement probe based on microwave heating and measurement method thereof
  • Flowing wet vapor humidity measurement probe based on microwave heating and measurement method thereof
  • Flowing wet vapor humidity measurement probe based on microwave heating and measurement method thereof

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Experimental program
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Embodiment Construction

[0022] The present invention is described in further detail below in conjunction with accompanying drawing:

[0023] refer to figure 1 , the flow wet steam humidity measurement probe based on microwave heating according to the present invention includes a bracket 1, a sampling head 21, an inner tube 18, an outer tube 19, a rear end cover 11, a vacuuming device, a microwave power meter 12, and a microwave source 2 , coaxial line 8, microwave cavity 4 and data acquisition system 3;

[0024] The sampling head 21 is welded on the bracket 1, one end of the inner tube 18 is connected with the sampling head 21, one end of the outer sleeve 19 is fixed on the bracket 1, the other end of the outer sleeve 19 is sealed and connected with the rear end cover 11, and the inner tube The other end of 18 passes through the rear end cover 11 and is connected to the vacuuming equipment through the regulating valve 13, the inner tube 18 and the outer tube 19 are filled with thermal insulation mat...

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Abstract

The invention discloses a flowing wet vapor humidity measurement probe based on microwave heating and a measurement method of the probe. The probe is characterized in that flowing wet vapor is heated to form superheated vapor through microwaves, and then measurement on the wet vapor humidity is achieved. The wet vapor probe mainly comprises a sampling probe, a microwave heating section, a microwave source, a control circuit, temperature and pressure sensors and a data acquisition system, wherein the sampling probe is aligned to the flowing direction of wet vapor so as to achieve isokinetic sampling; microwaves generated from the microwave source are transmitted into a microwave resonance cavity through a coaxial line; moisture and vapor in flowing wet vapor inside the resonance cavity can simultaneously absorb microwave energy so as to be rapidly heated to form superheated vapor; data measured by the temperature and pressure sensors are displayed, processed and output through the data acquisition system, and then measurement on the humidity of flowing wet vapor is achieved. The probe is applicable to measurement on the humidity of flowing wet vapor at various flowing speeds, and in particular to measurement on the humidity of wet vapor inside a turbine.

Description

technical field [0001] The invention relates to a flow wet steam humidity measurement probe and a measurement method thereof, in particular to a flow wet steam humidity measurement probe based on microwave heating and a measurement method thereof. 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 the efficiency of the unit to decrease, 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] Among the measurement methods of flowing wet steam in steam turbines, thermal and optical methods are relatively ...

Claims

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Application Information

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IPC IPC(8): G01N25/60
Inventor 李亮刘启凡薛太旭张安学
Owner XI AN JIAOTONG UNIV
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