DESIGN OPTIMIZATION OF LEAD-BISMUTH HELICAL COIL ONCE-THROUGH TUBE STEAM GENERATOR BASED ON POROUS MEDIUM METHOD

As one of the most promising concepts for GEN-IV reactors, Liquid Metal Fast Reactor (LMFR) has attracted more research attention. Helical Coil Once-through Tube Steam Generator is a proposed form of steam generator with its unique advantages. It is widely used in various reactor power systems, including LMFR. In this paper, a numerical simulation method of Lead-bismuth Helical Coil Once-through Tube Steam Generator (LHCOTSG) based on porous medium method is proposed. The correctness of the simulation method is validated by comparison with three-dimensional numerical simulation results. Based on this method, a LHCOTSG with a given working condition was designed and studied. Under the power target of 1.5MW, the arrangement of four-layer helical tubes has the optimal comprehensive performance. On this basis, the performance of LHCOTSG with different geometric parameters under different working conditions was evaluated by comprehensive performance evaluation index. The multivariate linear fitting method is adopted to obtain the best geometric model within the range of working conditions and geometric parameters. The highest performance was improved by 3.37%. This study provides a new method reference for numerical simulation and design optimization of LHCOTSG.