Water-removable microwave resonant cavity for steam humidity measurement

Abstract

The invention discloses a microwave resonant cavity capable of removing water film for steam humidity measurement, which comprises a steam flow inlet pipe, a resonant cavity pipe and a frequency adjustment pipe which are threadedly connected from front to back, the steam flow inlet pipe, the resonant cavity A ring-shaped droplet collection chamber is provided between the tube and the sealing gasket. The resonant cavity tube is provided with a droplet outlet that communicates with the droplet collection chamber. The airflow inlet tube is provided with an axial hole that communicates with the droplet collection chamber. , the axial hole communicates with the pipe hole of the steam flow inlet pipe through the radial hole set on the steam flow inlet pipe; The rear isolation tube, the part between the front isolation tube and the rear isolation tube in the resonant cavity tube hole constitutes the measurement chamber, the resonant cavity tube is provided with a coupling installation hole, and the end of the coupling installation hole is connected to the measurement chamber; The invention is a microwave resonant cavity capable of automatically removing water film deposits on the inner wall of the cavity, which has strong pipe environment adaptability and low cost.

Description

technical field [0001] The invention relates to a microwave resonant cavity capable of automatically removing water film deposits on the inner wall of a cavity, which is used for accurate on-line measurement of steam humidity, and belongs to the technical field of testing. Background technique [0002] Wet steam widely exists in the last few stages of low-pressure cylinders of condensing steam turbines in thermal power plants and all stages of nuclear power steam turbines in water-cooled reactors. The existence of wet steam mainly brings two problems to the operation of steam turbines: one is due to the unbalanced flow of steam The resulting thermodynamic loss, moisture loss, relative flow between water droplets and the mainstream, and impact between water droplets and blades will reduce the efficiency of the steam turbine stage working in the wet steam area; secondly, the small water droplets in the wet steam will erode the blades of the steam turbine, The surface of the bl...

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Problems solved by technology

[0002] Wet steam widely exists in the last few stages of low-pressure cylinders of condensing steam turbines in thermal power plants and all stages of nuclear power steam turbines in water-cooled reactors. The existence of wet steam mainly brings two problems to the operation of steam turbines: one is due to the unbalanced flow of steam The resulting thermodynamic loss, moisture loss, relative flow between water droplets and the mainstream, and impact between water droplets and blades will reduce the efficiency of the steam turbine stage working in the wet steam area; secondly, the small water droplets in the wet steam will erode the blades of the steam turbine, The surface of the blade becomes rough, pits appear, and even break, which seriously affects the safe operation of the steam turbine

During the measurement process, when the wet steam flows through the resonant cavity, due to the deposition of droplets, a layer of water film will be formed on the inner surface of the resonant cavity, and the water film on the inner wall of the cavity will have two adverse effects on the measurement: increase the dielectric loss, Decrease the quality factor of the resonant cavity and reduce the measurement accuracy; make the resonant frequency of the measurement chamber shift and increase the measurement error

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