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Research Papers: Fuel Combustion

Technical and Economical Assessment of the Indirectly Heated Carbonate Looping Process

[+] Author and Article Information
Markus Junk

Institute for Energy Systems and Technology,
Technische Universität Darmstadt,
Otto-Berndt-Str. 2,
Darmstadt 64287, Germany
e-mail: markus.junk@est.tu-darmstadt.de

Michael Reitz

Institute for Energy Systems and Technology,
Technische Universität Darmstadt,
Otto-Berndt-Str. 2,
Darmstadt 64287, Germany
e-mail: michael.reitz@est.tu-darmstadt.de

Jochen Ströhle

Institute for Energy Systems and Technology,
Technische Universität Darmstadt,
Otto-Berndt-Str. 2,
Darmstadt 64287, Germany,
e-mail: jochen.stroehle@est.tu-darmstadt.de

Bernd Epple

Institute for Energy Systems and Technology,
Technische Universität Darmstadt,
Otto-Berndt-Str. 2,
Darmstadt 64287, Germany
e-mail: bernd.epple@est.tu-darmstadt.de

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received July 21, 2015; final manuscript received March 20, 2016; published online April 19, 2016. Assoc. Editor: Ashwani K. Gupta.

J. Energy Resour. Technol 138(4), 042210 (Apr 19, 2016) (8 pages) Paper No: JERT-15-1268; doi: 10.1115/1.4033142 History: Received July 21, 2015; Revised March 20, 2016

Carbonate looping promises low energy penalties for postcombustion CO2-capture and is particularly suited for retrofitting existing power plants. To further improve the process, a new concept with an indirectly heated calciner using heat pipes was developed, offering even higher plant efficiencies and lower CO2 avoidance costs than the oxy-fired standard carbonate looping process. The concept of the indirectly heated carbonate looping (IHCL) process was tested at sufficient scale in a 300 kWth pilot plant at Technische Universität Darmstadt. The paper presents a technical overview of the process and shows first test results of the pilot plant. Furthermore, the concept is economically evaluated and compared to other carbon capture processes.

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Figures

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Fig. 1

(a) Simplified setup of the IHCL process and (b) efficiency penalties of the standard (SCLR) and IHCL retrofit with internal solid/solid heat exchange (IHCLPHR)

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Fig. 2

Experimental setup of the 300 kWth test facility

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Fig. 3

Sectional representation (left) and picture (right) of the heat pipe heat exchanger

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Fig. 4

Picture (left) and 3D sketch (right) of the 300 kWth pilot plant at Technische Universität Darmstadt

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Fig. 5

Top left: CO2 capture based on the equilibrium and carbonator bed pressure and inventory; top right: CO2 capture efficiency and CO2 inlet and outlet concentration; bottom left: reactor temperatures; bottom right: thermal power of the combustor and CO2 and steam mass flow to the carbonator

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Fig. 6

Representative temperature profile of the 300 kW pilot

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Fig. 7

Left: impact of the cost variation on the overall CO2 avoidance costs; right: equipment cost shares of the IHCL plant

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Fig. 8

CO2 avoidance costs of different studies for various technologies (without compression)

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