Humidity Measurement Method for Flowing Wet Steam Used in Pressurized Water Reactor Nuclear Power Plant

Abstract

The invention discloses a flow wet steam humidity measurement system and a measurement method thereof. The flow wet steam humidity measurement system includes a sampling inlet section for sampling wet steam, a superheated steam source for providing superheated steam, and a steam mixing device for mixing wet steam and superheated steam , the superheated steam inlet section whose inlet end is connected to the superheated steam source, the mixed steam outlet section whose inlet end is connected with the steam mixing device, wherein the outlet ends of the sampling inlet section and the superheated steam inlet section are all connected to the steam mixing device; The steam inlet section and the mixed steam outlet section are all provided with a pressure acquisition device, a flow acquisition device and a temperature acquisition device, and the sampling inlet section is provided with a pressure acquisition device; the sampling inlet section and the superheated steam inlet section are near the inlet end Both are also provided with a flow regulating valve. The measurement result of the invention is accurate and reliable, and the humidity of flowing wet steam under different humidity conditions can be measured in real time, and the system structure is simple, and the cost of required equipment 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 method used in a pressurized water reactor nuclear power plant. 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 engi...

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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