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<p>Molten salt reactors (MSR) produce off-gases containing chemically reactive and radioactive species necessitating effective treatment to ensure operational safety and compliance with environmental regulations. This study examines the hydrodynamic behavior and HCl capture performance of a bubble column-type molten salt scrubber designed for MSR off-gas treatment. Flow regime transition from homogeneous to heterogeneous was identified at a gas velocity of 0.025&#xa0;m/s in NaOH (51&#xa0;mol%)-KOH molten salt at 250&#xa0;°C through gas holdup and drift flux analyses. HCl capture efficiency was assessed at 100&#xa0;ppm HCl inlet concentrations over gas velocities of 0.01–0.03&#xa0;m/s and temperatures of 250–300&#xa0;°C. In the homogeneous flow regime, capture efficiency reached approximately 97% at 0.03&#xa0;m/s, with minimal temperature dependence. Thermodynamic analysis using HSC Chemistry indicated slight Gibbs free energy changes across the tested temperature range, with sequential formation of KCl and NaCl as reaction products. Operating the bubble column-type molten salt scrubber in the homogeneous flow regime optimizes capture efficiency and minimizes aerosol generation, enhancing nuclear safety and off-gas management for sustainable MSR operations.</p>

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Flow Regime Transition and HCl Capture in a Bubble Column-Type Molten Salt Scrubber

  • 期刊论文

  • 发表日期：

    2025年8月18日

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  • Yung Zun Cho,
  • Do Kyu Kang,
  • Seok Min Hong,
  • Chang Hwa Lee

摘要

Molten salt reactors (MSR) produce off-gases containing chemically reactive and radioactive species necessitating effective treatment to ensure operational safety and compliance with environmental regulations. This study examines the hydrodynamic behavior and HCl capture performance of a bubble column-type molten salt scrubber designed for MSR off-gas treatment. Flow regime transition from homogeneous to heterogeneous was identified at a gas velocity of 0.025 m/s in NaOH (51 mol%)-KOH molten salt at 250 °C through gas holdup and drift flux analyses. HCl capture efficiency was assessed at 100 ppm HCl inlet concentrations over gas velocities of 0.01–0.03 m/s and temperatures of 250–300 °C. In the homogeneous flow regime, capture efficiency reached approximately 97% at 0.03 m/s, with minimal temperature dependence. Thermodynamic analysis using HSC Chemistry indicated slight Gibbs free energy changes across the tested temperature range, with sequential formation of KCl and NaCl as reaction products. Operating the bubble column-type molten salt scrubber in the homogeneous flow regime optimizes capture efficiency and minimizes aerosol generation, enhancing nuclear safety and off-gas management for sustainable MSR operations.