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research-article

Testing of a Novel Post Combustion Acid Removal Process for the Direct-Fired, Oxy-Combustion Allam Cycle Power Generation System

[+] Author and Article Information
Xijia Lu

8 Rivers Capital, 406 Blackwell Street Crowe Building 4th Floor, Durham, North Carolina 27701
xijia.lu@8rivers.com

Scott Martin

8 Rivers Capital, 406 Blackwell Street Crowe Building 4th Floor, Durham, North Carolina 27701
scott.martin@8rivers.com

Michael McGroddy

8 Rivers Capital, 406 Blackwell Street Crowe Building 4th Floor, Durham, North Carolina 27701
mike.mcgroddy@8rivers.com

Michael Swanson

Energy and the Environment Research Center, 15 N 23rd St, Grand Forks, ND 58202
mswanson@undeerc.org

Joshua Stanislowski

Energy and the Environment Research Center, 15 N 23rd St, Grand Forks, ND 58202
jstanislowski@undeerc.org

Jason Laumb

Energy and the Environment Research Center, 15 N 23rd St, Grand Forks, ND 58202
jlaumb@undeerc.org

1Corresponding author.

ASME doi:10.1115/1.4038459 History: Received July 12, 2017; Revised September 06, 2017

Abstract

The Allam Cycle is a high performance oxy-fuel, supercritical CO2 power cycle that offers significant benefits over traditional hydrocarbon fuel-based power generation systems. A major benefit arises in the elimination of costly pre-combustion acid gas removal (AGR) for sulfur- (SOX) and nitrogen-based (NOX) impurities by utilizing a novel, embedded cleanup process that utilizes combustion derived NOX as a gas phase catalyst to effect SOX oxidation, followed by NOX removal. The reactions required for this process, which have been well-demonstrated for the cleanup of exhaust gases, convert SOX and NOX species to sulfuric and nitric and nitrous acid for removal from the supercritical CO2 stream. The process results in simplified and significantly lower cost removal of these species and utilizes conditions inherent to the Allam Cycle that are ideally suited to facilitate this process. 8 Rivers Capital and the Energy & Environmental Research Center (EERC) are testing and optimizing this impurity removal process for supercritical CO2 cycles such as the Allam Cycle. Both reaction kinetic modeling and on-site testing have been completed. Initial results show that both SOX and NOX are substantially removed from CO2-rich exhaust gas containing excess oxygen operating under 20 bar utilizing a simple packed spray column. Sensitivity of the removal rate to the concentration of oxygen and NOX was investigated. Follow-on work will focus on system optimization of removal efficiency and removal control, minimization of metallurgy and corrosion risks from handling concentrated acids, and reduction of overall system CAPX/OPEX.

Copyright (c) 2017 by ASME
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