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A novel application of the SAWD-Sabatier-SPE integrated system for CO2 removal and O2 regeneration in submarine cabins during prolonged voyages

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Abstract

To improve the working and living environment of submarine crews, an integrated system of CO2 removal and O2 regeneration was designed to work under experimental conditions for 50 people in a submarine cabin during prolonged voyages. The integrated system comprises a solid amine water desorption (SAWD) unit for CO2 collection and concentration, a Sabatier reactor for CO2 reduction and a solid polymer electrolyte (SPE) unit for O2 regeneration by electrolysis. The performances of the SAWD-Sabatier-SPE integrated system were investigated. The experimental results from the SAWD unit showed that the average CO2 concentration in the CO2 storage tank was more than 96% and the outlet CO2 concentration was nearly zero in the first 45 min, and less than 1/10 of inlet CO2 after 60 min when input CO2 was 0.5% (1000 L). About 950 L of CO2 was recovered with a recovery rate of 92%∼97%. The output CO2 concentration was less than 0.2%, which showed that the adsorption-desorption performance of this unit was excellent. In the CO2 reduction unit we investigated mainly the start-up and reaction performance of the Sabatier reactor. The start-up time of the Sabatier reactor was 6, 8 and 10 min when the start-up temperature was 187.3, 179.5 and 168 °C, respectively. The product water was colorless, transparent, and had a pH of 6.9∼7.5, and an electrical conductivity of 80 µs/cm. The sum of the concentration of metal ions (Ru3+, Al3+, Pb2+) was 0.028% and that of nonmetal ions (Cl−, SO4 2−) was 0.05%. In the O2 regeneration unit, the O2 generation rate was 0.48 m3/d and the quantity was 2400 L, sufficient to meet the submariners’ basic oxygen demands. These results may be useful as a basis for establishing CO2-level limits and O2 regeneration systems in submarines or similar enclosed compartments during prolonged voyages.

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Authors and Affiliations

  1. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China

    Zhi Huang, Zhao-bo Chen, Nan-qi Ren & Dong-huan Zheng

  2. School of Materials Science & Chemical Engineering, Harbin Engineering University, Harbin, 150001, China

    Dong-xue Hu

  3. Institute of Environmental Science and Engineering, Nanyang Technological University, 637723, Singapore, Singapore

    Zhen-peng Zhang

Authors
  1. Zhi Huang
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  2. Zhao-bo Chen
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  3. Nan-qi Ren
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  4. Dong-xue Hu
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  5. Dong-huan Zheng
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  6. Zhen-peng Zhang
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Corresponding author

Correspondence to Zhao-bo Chen.

Additional information

Project supported by the National Natural Science Foundation of China (No. 50908062), the State Key Lab of Urban Water Resource and Environment (No. HIT-QAK200808), and the Heilongjiang Natural Science Foundation (No. E2007-04), China

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Huang, Z., Chen, Zb., Ren, Nq. et al. A novel application of the SAWD-Sabatier-SPE integrated system for CO2 removal and O2 regeneration in submarine cabins during prolonged voyages. J. Zhejiang Univ. Sci. A 10, 1642–1650 (2009). https://doi.org/10.1631/jzus.A0920017

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  • DOI: https://doi.org/10.1631/jzus.A0920017

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