Purification and preparation of SF6 gas mixtures
SF6 recycling and re-use
In practice, it often happens that the used SF6 gas is contaminated with air by inadequate evacuation or improper gas handling. Used SF6 gas containing an unacceptably high percentage of nitrogen and air can be prepared by DILO separating units to the desired quality level.
The advantages of gas preparation:
- Minimization of waste disposal costs
- Lower costs for new gas
- Less expenses for transportation
- Reduced storage costs
The purity degree of the prepared SF6 gas fully complies with IEC 60480 directive for used SF6 gas. The values achieved as to
- SF6 volume
- Decomposition products (SO2)
are far below the reference values of IEC 60480 directive and are even lower than the values stipulated by IEC 60376 (regulation for new SF6 gas) and Chinese regulation GB/T 12022/2006 (Chinese standard for new SF6 gas).