Abstract
Pressure drop across the moisture separator installed in the steam generator of a nuclear power plant affects the power generation efficiency, and so accurate pressure drop prediction is important in generator design. In this study, an empirical correlation is proposed for predicting the two-phase pressure drop through a moisture separator. To ensure the applicability of the correlation, a series of two-phase air-water experiments were performed, and the results of the present test and of the benchmark test of high-pressure steam-water were used in developing the correlation. Based on the experimental results, quality, dimensionless superficial velocity, density ratio of the working fluid, and the geometrical factor were considered to be important parameters. The two-phase pressure drop multiplier was expressed in terms of these parameters. The empirical correlation was found to predict the experimental results within a reasonable range.
Highlights
The moisture separation system of a steam generator in the nuclear power plant is composed of primary separators, a secondary separator, and a steam dryer bank
The steam-water two-phase mixture is generated from the tube bundle inside the steam generator, so the two-phase pressure drop should be regarded as an important parameter in the optimal design of the nuclear power plant
There is a lack of information about the two-phase pressure drop across moisture separators due to the large cost for the experiment involved in the high pressure and temperature conditions
Summary
The moisture separation system of a steam generator in the nuclear power plant is composed of primary separators, a secondary separator, and a steam dryer bank. The major parameters related to the criteria are the moisture carry-over (MCO), the steam carry-under (SCU), and pressure drop. The steam-water two-phase mixture is generated from the tube bundle inside the steam generator, so the two-phase pressure drop should be regarded as an important parameter in the optimal design of the nuclear power plant. High pressure drop deteriorates the circulation ratio of the coolant relating power generation efficiency. A database of the pressure drops across single moisture separators under a wide range of operating conditions is essential to estimate the overall efficiency of the power generation. There is a lack of information about the two-phase pressure drop across moisture separators due to the large cost for the experiment involved in the high pressure and temperature conditions
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