Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Vacuum system design of a 10 ton/day class air liquefaction cold box for liquid air energy storage

  • Sehwan, In (Korea Institute of Machinery and Materials) ;
  • Juwon, Kim (Korea Institute of Machinery and Materials) ;
  • Junyoung, Park (Korea Institute of Machinery and Materials) ;
  • Seong-Je, Park (Korea Institute of Machinery and Materials) ;
  • Jiho, Park (Korea Institute of Machinery and Materials) ;
  • Junseok, Ko (Korea Institute of Machinery and Materials) ;
  • Hankil, Yeom (Korea Institute of Machinery and Materials) ;
  • Hyobong, Kim (Korea Institute of Machinery and Materials) ;
  • Sangyoon, Chu (Korea Institute of Machinery and Materials) ;
  • Jongwoo, Kim (Korea Institute of Machinery and Materials) ;
  • Yong-Ju, Hong (Korea Institute of Machinery and Materials)
  • Received : 2022.11.11
  • Accepted : 2022.12.10
  • Published : 2022.12.31
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Abstract

A vacuum system is designed for thermal insulation of a 10 ton/day class air liquefaction cold box for liquid air energy storage. The vacuum system is composed of a turbomolecular pump, a backing pump and vacuum piping for the vacuum pumps. The turbomolecular pump is in combination with the backing pump for pumping capacity. The vacuum piping is designed with system installation conditions, such as distance from the cold box, connections to vacuum pumps and installation space. The capacity of the vacuum pump combination, namely pumping speed, is determined by analysis of the vacuum system, and pump-down time to 1×10-5 mbar is estimated. Vacuum piping conductance, system pumping speed and outgassing rate are calculated for the pump-down time with the ultimate pumping speed range of the vacuum pump combination of 1400 - 2300 l/s. Although the pump-down time gets shorter by larger capacity vacuum pumps, it mainly depends on target vacuum degree and outgassing rate in the cold box. The pump-down time is estimated as 3 - 6 hours appropriate for cold box operation for the pumping speed range. Considering the outgassing rate has uncertainty, the vacuum pump combination with pumping speed of 1900 l/s is chosen for the vacuum system, which is middle value of the pumping speed range.

Keywords

Acknowledgement

This work was supported by a grant of the Basic Research Program funded by the Korea Institute of Machinery and Materials (grant number : NK237F).

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