Linc Energy Limited successfully begun an oxygen air enrichment process at Chinchilla Underground Coal Gasification (UCG) project over the weekend. Linc reported a “step change” in the key quality gas measures within hours of commencing the oxygen enrichment process, including an increase in gas flow rates.
Oxygen enrichment of the air being injected into the UCG process is intended to ensure a better quality and purer syngas, said Linc Energy’s CEO Peter Bond. Oxygen injection also enables complete underground coal gasification in deeper coal seams more economically thereby opening up a significant number of coal opportunities around the globe.
The deeper the UCG process, the higher the pressure that is required to pump air or oxygen down the UCG injection well. Subsequently by enriching the air by the injection of oxygen, the result is lower nitrogen and lower compression costs.
Linc Energy has found that oxygen enriched air (being a mixture of oxygen and air which is being injected) is the most proficient, effective and economical way forward and that pure oxygen injection is simply not economical.
Linc Energy’s Chinchilla Demonstration Facility uses gas to liquids (GTL) technology to produce syncrude (which requires refinement to create diesel and other liquid fuel products) from the UCG syngas.