The CO2 captured from a power plant must be compressed from near atmospheric pressure to a pressure between 1,500 and 2,200 psi to be transported via pipeline and then injected into an underground storage site.
The compression of CO2 represents a potentially large auxiliary power load on the overall power plant system. For example, in an August 2007 study conducted for NETL, CO2 compression was accomplished using a six-stage centrifugal compressor with interstage cooling that required an auxiliary load of approximately 7.5 percent of the gross power output of a subcritical pressure, coal-fired power plant. As a result, NETL is sponsoring R&D to develop novel methods that can significantly decrease the power requirements for CO2 compression. NETL-funded CO2 compression projects are shown in the table below.
Click on a project title in the table for more information.
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Active and completed projects researching oxy-combustion CO2 control.