Flowing wet steam wetness measuring system and method

Abstract

The invention discloses a flowing wet steam wetness measuring system and a measuring method. The flowing wet steam wetness measuring system comprises a sampling inlet section, an over-hot steam source, a steam mixing device, an over-hot steam inlet section and a mixed steam outlet section, wherein the sampling inlet section is used for sampling wet steam; the over-hot steam source is used for supplying over-hot steam; the steam mixing device is used for mixing wet steam and over-hot steam; the inlet end of the over-hot steam inlet section is connected with the over-hot steam source; the inlet end of the mixed steam outlet section is connected with the steam mixing device; the outlet ends of the sampling inlet section and the over-hot steam inlet section are both connected with the steam mixing device; both the over-hot steam inlet section and the mixed steam outlet section are provided with pressure acquisition devices, flow acquisition devices and temperature acquisition devices; a pressure acquisition device is arranged on the sampling inlet section; the sampling inlet section and the over-hot steam inlet section are further provided with flow adjusting valves near the inlet ends. The flowing wet steam wetness measuring system is accurate and reliable in measurement result, the wetness of flowing wet steam under different wetness conditions can be measured in real time, the system is simple in structure, and the equipment cost is low.

Description

technical field [0001] The invention relates to the field of flow wet steam measurement, in particular to a flow wet steam humidity measurement system and method. Background technique [0002] Pressurized water reactor nuclear power plants mostly use saturated natural circulation steam generators. Flowing wet steam widely exists in this type of steam generator. For example, the steam-water two-phase mixture with a dryness of about 30% flows through the steam-water separator and is centrifugally separated to become flowing wet steam with a humidity of about 8% to 15%. After separation, it flows into the dryer and flows out of the steam generator after separation. The humidity of the steam must be less than 0.25% before it is allowed to enter the steam turbine to do work. Therefore, the measurement and monitoring of the humidity of the flowing wet steam in the steam generator has always been the focus of extensive attention in engineering design and operation practice. Among...

AI Technical Summary

Problems solved by technology

The optical method is relatively new, but the measurement principle and system are complex, and the optical glass is easily polluted, and the measurement results for steam containing large droplets and high humidity are not ideal

Although the tracer method is widely used in nuclear power plants, it takes a long time to uniform the tracer in the entire flow system before measurement, and then perform multi-point sampling and analysis. It is an off-line measurement and is generally used in new nuclear power plants. The steam generator acceptance test cannot realize real-time measurement, which is time-consuming and labor-intensive

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