Journal of Thermal Science

, Volume 16, Issue 1, pp 79–83 | Cite as

A novel magnetic separation oxygen-enriched method and the influence of temperature and magnetic field on enrichment

  • Li Wang
  • Jun Cai
  • Ping Wu
  • Lige Tong
  • Shufeng Sun


A novel oxygen-enriched method is presented. Using two opposite magnetic poles of two magnets with certain distance forms a magnetic space having a field intensity gradient near its borders. When air injected into the magnetic space outflows from the magnetic space via its borders, oxygen molecules in air will experience the interception effect of the gradient magnetic field, but nitrogen molecules will outflow without hindrance. Thereby the continuous oxygen enrichment is realized. The results show that the maximum increment of oxygen concentration reaches 0.49% at 298 K when the maximum product of magnetic flux density and field intensity gradient is 563T2/m. The enrichment level is significantly influenced by the gas temperature and the magnetic field. The maximum increment of oxygen concentration drops to 0.16% when the gas temperature rises to 343 K, and drops to 0.09% when the maximum product of magnetic flux density and gradient is reduced to 101 T2/m from 563 T2/m.


magnetic separation oxygen enrichment oxygen separation gradient magnetic field magnetizing force 



magnetic flux density (T)


gradient of magnetic flux density(T2/m)


magnetizing force (N)


height of permanent magnet (mm)


length of permanent magnet (mm)


gas pressure(Pa)


gas pressure under the standard condition (Pa)


air volume flow rate (mL/min)


gas temperature(K)


width of permanent magnet(mm)

Greek letters


distance between two magnetic poles(mm)


magnetic permeability of the vacuum(N/A2)


volume susceptibility of oxygen


volume susceptibility of oxygen under the standard conditions







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Copyright information

© Science Press 2007

Authors and Affiliations

  • Li Wang
    • 1
  • Jun Cai
    • 1
  • Ping Wu
    • 1
  • Lige Tong
    • 1
  • Shufeng Sun
    • 1
  1. 1.School of Mechanical EngineeringUniversity of Science and Technology BeijingBeijingChina

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