Experimental device for evaporating and post-evaporating thermotechnical hydraulic characteristics during in-tube flow boiling and evaporation judging method

Abstract

The invention provides an experimental device for evaporating and post-evaporating thermotechnical hydraulic characteristics during in-tube flow boiling and an evaporation judging method. The device comprises a vertical tube experimental section, an electric heater and a control system thereof, a heating electrode and a data acquisition system. The device is characterized in that electrodes are separately mounted on the upper and lower ends of the vertical tube experimental section, the electrodes are connected to the electric heater, a heat resistor is mounted on the outer wall of the vertical tube experimental section, a pressure sensor and an optical fiber probe are mounted in the vertical tube experimental section, measuring holes are formed in the vertical tube experimental section in a spaced manner, a pressure difference transmitter is mounted between two adjacent measuring holes, and the heat resistor, the pressure sensor, the optical fiber probe and the pressure different transmitters are connected to the data acquisition system. By pre-judging an evaporating position to perform an experiment to obtain related data, experiment researches on evaporating and post-evaporating thermotechnical hydraulic characteristics in an in-tube flow boiling process are realized.

Description

technical field [0001] The invention relates to an experimental device for flow boiling and evaporation in a tube and thermal hydraulic characteristics after evaporation, and also relates to a method for distinguishing flow boiling and evaporation in a tube. Background technique [0002] Compared with the traditional natural circulation steam generator used in most nuclear power plants such as Daya Bay, the once-through steam generator can generate superheated steam, which has great advantages in power generation efficiency, compactness and high-temperature heating effect. Marine nuclear power Due to space constraints, the once-through steam generator of the system puts forward higher requirements for its volume and efficiency. However, when water is heated from a supercooled state to a superheated state, when the mass vapor content reaches a high value, the ring-shaped liquid film attached to the wall will be torn, and the flow boiling heat transfer will deteriorate. Pheno...

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Problems solved by technology

If the evaporation heat transfer deterioration phenomenon and the thermal hydraulic characteristics after evaporation cannot be effectively controlled during the operation of the once-through steam generator, it will lead to a nonlinear and drastic change in the wall temperature of the heat transfer tube, which will endanger the steam generator and the entire system safe and stable operation of

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