(218a) Integrations for Oxyfuel Power Production Process Utilizing Novel CO2 Purification System

Two key aspects of oxyfuel combustion of coal in power boilers are the process concepts for the oxy-combustion within the boiler scope and the backend CO2 purification and compression. Thoughtful integration of various unit operations can improve the overall efficiency of the oxycoal combustion process for power production. As for the CO2 capture process, special attention must be paid to the contaminants within the raw CO2 product beyond the typical H2O, O2, N2, and Ar. In particular, acid gases such as SO3, SO2, HCl and NOX produced as products of combustion represent both an opportunity and a challenge. These acidic impurities will need to be removed cost effectively from the CO2 stream before it is introduced into the pipeline to prevent corrosion and comply with possible regulations. The keys to providing a viable CO2 capture technology relies on two principals: 1) advanced technology that reduces the penalty associated with capture and 2) integration of capture technology within an oxyfuel power boiler flowsheet. Air Products' novel compression and purification technology provides a viable and unique solution to the CO2 capture problem which can be readily integrated into retrofit and new build markets.

Air Products has advanced this technology via many projects including a U.S. Department of Energy (DOE) project to design and construct its proprietary CO2 purification system for a slip stream (~1/3 MWth) pilot-scale tests at the site of a 15 MWth tangentially-fired (T-fired) boiler oxycombustion test facility. Air Products is also developing other plants for larger pilots of the technology that will demonstrate the sour compression technology at around the 1 MWth scale, plus purification with inerts and oxygen removal, together with other aspects of Air Products Oxyfuel Purification Technology, such as the use of a membrane to recover CO2 and O2 normally lost with the inerts stream. In this paper we review the latest process concepts/integrations for oxyfuel combustion of coal for CO2 capture as well as an integrated process for CO2 compression and simultaneous purification to produce CO2 product streams at purities up to essentially pure CO2.

Acknowledgment: ?A portion of this material is based upon work supported by the Department of Energy's National Energy Technology Laboratory under Award Number DE-NT0005309.?

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