Abstract
The most important design parameters of a moisture separator to optimize the efficiency of a nuclear power plant are the moisture carry over and pressure drop. An air-water test facility was constructed to evaluate the design parameters for various types of conventional moisture separators in Korea. In this study, a half scale of swirl-vane separator was designed, and test conditions were defined based on the scaling law to cover a wide range of operating conditions. The moisture carry over was measured using an isokinetic sampling system for 34 different flow conditions. The MCO was in range of 0.30–7.05% according to the test conditions. Single and two-phase flow experiments were also carried out to identify the two-phase pressure drop characteristics. Based on the obtained results, the proposed empirical correlation model was extended to a submerged separator and applying these results to a full scale system is discussed in this paper.
Highlights
We evaluated the performance of a moisture separator (PEMS) test facility constructed to evaluate the performance of Korea conventional moisture separators
We developed the empirical correlation to predict the two-phase pressure drop of the Combustion Engineering (CE) type separator based on a separated separated flow flow model model [12]
This means that the inherent difference of swirl location or geometric shape induces the discrepancy of the two-phase pressure drop as a constant value, even though the two-phase pressure drop is accompanied by the multi-dimensional two-phase vortex flow
Summary
The moisture separators in a steam generator play an important role in ensuring the integrity of the power conversion system and the high efficiency of a nuclear power plant. Sun et al [7] carried out air-water experiments for a scaled-down model of swirl-vane separator They proposed an empirical correlation using only a Re number for the two-phase pressure drop. Performed air-water experiments to improve the BWR separator design using a half scale model and verified using the two-phase flow simulations. They suggested the scaling law by adjusting the quality and two-phase centrifugal force, and showed good agreement with the prototype conditions. We carried out a series of two-phase air-water experiments for the full and half scale of the CE type separator in the PEMS test facility, and the applicability was verified by the experimental data of plant conditions [12]. The improved empirical correlation was scrutinized by comparing the experimental data [13] and the other scaling model [9]
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