Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Study on the Structure Optimization and the Operation Scheme Design of a Double-Tube Once-Through Steam Generator

  • Wei, Xinyu (Department of Nuclear Science and Technology, Xi'an Jiaotong University) ;
  • Wu, Shifa (Department of Nuclear Science and Technology, Xi'an Jiaotong University) ;
  • Wang, Pengfei (Department of Nuclear Science and Technology, Xi'an Jiaotong University) ;
  • Zhao, Fuyu (Department of Nuclear Science and Technology, Xi'an Jiaotong University)
  • Received : 2015.10.19
  • Accepted : 2016.02.22
  • Published : 2016.08.25
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Abstract

A double-tube once-through steam generator (DOTSG) consisting of an outer straight tube and an inner helical tube is studied in this work. First, the structure of the DOTSG is optimized by considering two different objective functions. The tube length and the total pressure drop are considered as the first and second objective functions, respectively. Because the DOTSG is divided into the subcooled, boiling, and superheated sections according to the different secondary fluid states, the pitches in the three sections are defined as the optimization variables. A multi-objective optimization model is established and solved by particle swarm optimization. The optimization pitch is small in the subcooled region and superheated region, and large in the boiling region. Considering the availability of the optimum structure at power levels below 100% full power, we propose a new operating scheme that can fix the boundaries between the three heat-transfer sections. The operation scheme is proposed on the basis of data for full power, and the operation parameters are calculated at low power level. The primary inlet and outlet temperatures, as well as flow rate and secondary outlet temperature are changed according to the operation procedure.

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References

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