Microwave resonant cavity capable of automatically following steam exhaust direction

Abstract

The invention discloses a microwave resonant cavity capable of automatically following the steam exhaust direction. The microwave resonant cavity comprises a peripheral arc plate, a ring-shaped microwave resonant cavity body and three rotating connection devices, wherein the peripheral arc plate is in a semi-circular arc shape and has a downward arc-shaped end; the ring-shaped microwave resonant cavity body is arranged at the arc-shaped end of the peripheral arc plate. The microwave resonant cavity capable of automatically following the steam flow direction of the steam exhausted by a steam turbine is simple in structure, reliable in performances, high in adaptive capacity to environment and low in cost.

Description

technical field [0001] The invention belongs to the technical field of testing, and in particular relates to a microwave resonance that can automatically follow the exhaust steam flow direction for accurate on-line measurement of steam humidity. 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 blade becomes rough, pits ...

AI Technical Summary

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

If the resonant cavity is fixedly installed at the measurement position, during the measurement process, when the steam turbine is operating under variable conditions, the direction of the exhaust steam flow of the steam turbine will have a deflection angle with the central axis direction of the initially fixedly installed resonant cavity, which will cause measurement deviations Therefore, it is necessary to design a microwave resonant cavity that can automatically follow the direction of the exhaust steam flow of the steam turbine, so as to ensure that the central axis of the resonant cavity is always consistent with the direction of the exhaust steam flow, so as to improve the accuracy and accuracy of the measurement

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