Air Products is to design and construct a carbon dioxide (CO2) purification system in support of an oxyfuel technology development project.

The company has signed an agreement with the US Department of Energy (DOE), in association with a separate Cooperative Agreement between the DOE and Alstom Power Inc.

The project will use Alstom’s boiler simulation facility in Windsor, Connecticut.
CO2 purification is essential to the compression, transport and potential sequestion of greenhouse gas emissions from power plants.

The development project at the 15 megawatt thermal equivalent facility, to be conducted over two years beginning in mid-2009, is part of DOE’s furthering development of new and cost-effective technologies for the capture of CO2 from the existing fleet of US coal-fired power plants.

Air Products will purify a portion of the CO2 from flue gas coming from Alstom’s tangentially-fired coal combustion unit operated in oxy-combustion mode.

Air Products’ technology is designed to purify the CO2 by targeting removal of up to 95% of the impurities in the waste gas including sulphur oxides, hydrogen chloride and nitrogen oxides.

These acidic impurities must be removed from the CO2 stream to prevent corrosion before the purified CO2 is introduced into a pipeline.

Air Products’ CO2 purification and compression system is targeted to achieve over 90% CO2 capture, while improving cost savings over other technology such as amine-scrubbing, or more expensive and complex flue gas de-sulfurisation units and de-NOx units.

Steve Carney, Business Development Manager at Air Products said, “It’s now time to advance the technology from study and bench level testing to the next scale evaluation. Air Products’ oxyfuel technology has optimised the compression process to remove impurities to an acceptable level in the gas to make carbon sequestration possible.”

He added, “The ability to achieve this at lower costs is encouraging to industries with large scale CO2 emissions. We look forward to the results of this project and applaud DOE for its dedicated efforts on this important technology.”