Near-Zero Emissions Oxy-Combustion Flue Gas Purification
Project Number: DE-NT0005341
Praxair oxy-combustion test equipment.
Praxair Inc. will develop a near-zero emissions flue gas
purification technology for existing coal-fired power plants retrofit
with oxy-combustion technology. Emissions of sulfur dioxide (SO2)
and mercury (Hg) will be reduced by at least 99 percent, and nitrogen
oxide (NOx) emissions will be reduced by greater than 90 percent
without the need for wet flue gas desulfurization and selective
catalytic reduction (SCR). Two separate processes are proposed depending
on the sulfur content of the coal. For high-sulfur coal, SO2
and NOx will be recovered as product sulfuric acid and nitric acid,
respectively, and Hg will be recovered as mercuric sulfate. For
low-sulfur coal, SO2 will be converted to gypsum using a
high-pressure activated carbon process. Any residual NOx will be treated
in an SCR (<10 percent the size of a conventional SCR) and Hg will
be captured on carbon for disposal. In both the options, atmospheric
gases (oxygen, nitrogen, and argon) present with the CO2 will be separated and vented.
Related Papers and Publications:
- For further information on this project, contact the NETL Project Manager, Morgan Mosser.