Combustion of pure oxygen instead of fuel/air mixtures has been known for a long time.
Removing nitrogen, inert for combustion purposes, but active in transporting heat offers several advantages:

- It reduces the exhaust gas volume of about 75% thus greatly lowering heat loss.
- It allows to drastically reduce the NOx emissions
- Less engineering work, as pipelines require smaller sections. Heat exchangers are no more necessary too.
- Increased productivity thanks to higher flame temperature and heat transfer ratio, and colder flue gas.
- Easier mixing with fuel, leading to more stable flames, as you have no more problems of air excess or deficit

ESA, along with its strong collaboration with the SIAD Group has cumulated a huge experience in combustion of oxygen or enriched mixes and offer today standard or fully customised and complete solutions :