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type     June, 2005

Vol 1 Chapter 32: Cost and feasibility study on the Praxair advanced boiler for the CO2 Capture Project's refinery scenario

Leonard Switzer et al, Praxair Inc, USA

Abstract: Praxair Inc has developed a preliminary design and cost estimate for a boiler system that uses Praxair's advanced boiler technology to produce product steam, a system to capture the CO2 from the boiler exhaust. This report is in response to the Carbon Capture Project's refinery scenario. A model has been developed for an advanced boiler that combusts a gaseous fuel with O2, which is supplied from a thermally integrated network of oxygen transport membranes (OTMs). The exhaust from this system - being primarily CO2 and water -is then purified and compressed to recover the CO2 as a product. The OTMs are in the form of tubes arranged perpendicular to the direction of the exhaust gas flow in the furnace. Air circulated inside the membranes provides oxygen for combustion. As O2 is transported through the membrane, it combusts with the fuel and creates the required oxygen partial pressure gradient through the tube wall to facilitate transport. The heat release from the combustion keeps the OTMs at the required temperature for operation as well. Thus, the O2 separation system is thermally and chemically integrated with the combustion system. Based on the economic analysis conducted to date, a boiler with integrated ceramic membranes has the potential for substantial capital and operating cost savings when CO2 capture is required. In the case of a more conventional boiler without CO2 capture, the energy savings can potentially pay for the incremental cost of the OTM boiler in ~2 years.

Carbon Dioxide Capture for Storage in Deep Geologic Formations - Results from the CO2 Capture Project Capture and Separation of Carbon Dioxide from Combustion Sources - Volume 1
Edited by:
David C. Thomas, Senior Technical Advisor, Advanced Resources International Inc, USA

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