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Research Papers: Gas Turbines: Cycle Innovations

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, NC 27701
e-mail: Xijia.lu@8rivers.com

Scott Martin

8 Rivers Capital,
406 Blackwell Street,
Crowe Building 4th Floor,
Durham, NC 27701
e-mail: Scott.martin@8rivers.com

Mike McGroddy

8 Rivers Capital,
406 Blackwell Street,
Crowe Building 4th Floor,
Durham, NC 27701
e-mail: Mike.mcgroddy@8rivers.com

Mike Swanson

Energy and the Environment Research Center,
15 N 23rd Street,
Grand Forks, ND 58202
e-mail: MSwanson@undeerc.org

Josh Stanislowski

Energy and the Environment Research Center,
15 N 23rd Street,
Grand Forks, ND 58202
e-mail: jstanislowski@undeerc.org

Jason D. Laumb

Energy and the Environment Research Center,
15 N 23rd Street,
Grand Forks, ND 58202
e-mail: jlaumb@undeerc.org

1Corresponding author.

Contributed by the Cycle Innovations Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 12, 2017; final manuscript received September 6, 2017; published online May 15, 2018. Editor: David Wisler.

J. Eng. Gas Turbines Power 140(8), 081701 (May 15, 2018) (6 pages) Paper No: GTP-17-1352; doi: 10.1115/1.4038459 History: Received July 12, 2017; Revised September 06, 2017

The Allam Cycle is a high-performance oxy-fuel, supercritical CO2 power cycle that offers significant benefits over traditional fossil and hydrocarbon fuel-based power generation systems. A major benefit arises in the elimination of costly precombustion acid gas removal (AGR) for sulfur- (SOx) and nitrogen-based (NOx) impurities by utilizing a novel downstream cleanup process that utilizes NOx first as a gas phase catalyst to effect SOx oxidation, followed by NOx removal. The basic reactions required for this process, which have been well demonstrated in several facilities for the cleanup of exhaust gasses, ultimately convert SOx and NOx species to sulfuric, nitric, and nitrous acids 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), supported by the state of North Dakota, the U.S. Department of Energy and an Industrial consortium from the State of North Dakota, are currently working together to test and optimize this novel impurity removal process for pressurized, semi-closed 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 can be substantially removed from CO2-rich exhaust gas containing excess oxygen under 20 bar operating pressure 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 to improve removal efficiency and removal control, to minimize metallurgy and corrosion risks from handling concentrated acids, and to reduce overall capital cost and operating cost of the system.

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Figures

Grahic Jump Location
Fig. 1

Simplified process diagram of the core supercritical CO2 Allam Cycle

Grahic Jump Location
Fig. 3

Time history of the SO2 concentration recorded at the inlet and outlet of the column along with the O2 concentration profile

Grahic Jump Location
Fig. 2

High-level process flowsheet of the test article

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