Linde Statoil Snøvhit - Microfiltration plant cleans glycol-water mixture generated by natural gas production - Case Study
Snøvhit (in English – Snow White), or Snøvhitfeltet, is the fifth largest Norwegian gas field - operated by the Statoil Group. There are considerable gas reserves there, in the Barents Sea off the coast of Northern Norway. The gas is transported using pipelines laid on the seabed to the treatment plant located on an island. There, the gas is converted to liquid gas (LPG). A glycol-water mixture (MEG) is used to transport the gas from the borehole to the treatment plant.
In the first processing stage, the gas is separated from the transport medium and the transport medium is then fed into a regeneration process. EnviroChemie supplied an Envopur® microfiltration plant as part of the glycol-water mixture regeneration plant. This plant performs the complete mechanical cleansing of the glycol-water mixture.
The Envopur® plant consists of three parallel module blocks, each with 50% performance with an MEG-recovery rate of 95%, and two concentrate blocks, which can raise recovery to over 98%.
The plant design was arrived at using laboratory testing and numerous pilot tests. A particular challenge was posed by the asymmetric behaviour of the glycol-water mixture at the membrane.
The Envopur® plant is implemented as a fully automatic plant in a dedicated building unit, including CIP cleaning, cooling and intermediate storage. This Envopur unit was constructed as a fully operational unit in Antwerp harbour in summer 2005, and then towed from there across the North Sea to Norway. The Statoil liquid gas plant and therefore also the Envopur® plant went into production in 2008.