Australian UCG Process
UGC: Underground Coal Gasification
Australia is leading the world's renewal of interest in the
conversion of underground coal to an energy rich gas named SYNGAS.
SYNGAS can be used as high quality feedstock for gas fired power
stations and excitingly the production of HydroCarbon liquids as well
as a range of other products.
The process has been labelled as "Underground Coal Gasification" where coal is burnt underground and the resultant gas (Syngas) is piped to the surface. Underground coal gasification (UCG) is an in-situ gasification process carried out in non-mined coal seams using injection and production wells drilled from the surface, which enables the coal to be converted into product gas.
In its simplest form, injection and extraction wells are drilled into the coal seam. An oxidant is pumped into the injection well to stimulate combustion and the coal face is ignited, resulting in partial combustion of the coal in the seam. The oxidant may be air, oxygen, steam or a combination of all, depending on the design of the site and the requirements of the product gas.
The partial combustion of the coal results in the formation of a combustible product gas consisting of various proportions of hydrogen, methane, carbon monoxide and carbon dioxide – syngas. The syngas flows through the porous coal seam, is removed through the extraction well and then cleaned.
The process is flexible in operation and is capable of producing commercial quantities of gas to be used as a chemical feedstock or as fuel for power generation. The technique can be applied to resources that are otherwise not economical to extract and also offers an alternative to conventional coal mining methods for some resources. UCG has the advantage over traditional coal mining and gasification in minimising environmental and social harm. The technology could be used to ensure that coal remains a part of the global energy mix by providing a solution to reduce and abate greenhouse gas emissions (GHG). Wiki
Quick Points
Since the 1930s over 50 UCG pilot programs have been conducted world wide
The ignition rate can be controlled and can be stopped
The gas quality can be controlled
Between 70 - 90% of the coal is utilised
UCG has been deemed the "cleanest - greenest" way to utilise coal
The technology is widely seen as being ready for commercial development
The adoption of UCG will liberate vast quantities of "stranded" coal
Three Australian companies have carried out successful UCG trials
Australia has several trillion tons of coal that may be suitable for UCG
Coal seams more than 2m thick are highly suitable, 1.5- 2m medium suitable and less than 1m thick are unsuitable.
Queensland is said to be able to produce syngas worth 1 trillion dollars
The USA, China, UK, South Africa, Vietnam and India are currently researching and developing UCG technniques
Read an in-depth article about Underground Coal Gasification
View a short video about UCG technology by Carbon Energy
A longer video with more detail by Carbon Energy
Video Interview with Rohan Gillespie explaining the Regal UCTL process.... The next giant leap.
UCG Projects Worldwide.jpg "Underground coal gasification worldwide")
This map shows underground coal gasification (UCG) sites worldwide, including planned sites and prior pilot test sites. The sites of note are Centralia, Washington, and Hoe Creek, Wyoming, which are two Lawrence Livermore test sites; Chinchilla*, Australia, where the longest pilot in the Western world was recently completed; and Angren, Uzbekistan, where a commercial UCG plant has operated for 50 years. The underlying gray shading shows potential areas for geologic carbon storage. Read more -Fire in the Hole
*Over the last few years, the number of activities throughout the world focusing on UCG has rapidly increased. Linc Energy's Chinchilla project, operating from 1997 to 2009 in Queensland, Australia, demonstrated the first long-term UCG pilot in the Western world. That project has now advanced to the stage of completing a coal gas-to-liquids pilot that has successfully produced ultraclean diesel and aviation fuel. The company is now moving towards building a 20,000 BOE a day plant. Also in Queensland Carbon Energy have conducted a successful oxygen-injected Syngas production trial resulting in high quality, high volume gas production suited to power generation and multiple chemical synthesis products.
Investors wishing to profit from investment in the alternate energy sector, including UCG, GTL, CTL can invest directly in the Bakers Alternate Energy Customised Portfolio.
