Research Papers: Fuel Combustion

Design, Development, and Operation of an Integrated Fluidized Carbon Capture Unit Using Polyethylenimine Sorbents

[+] Author and Article Information
Ronald W. Breault, Lawrence J. Shadle

U.S. Department of Energy,
3610 Collins Ferry Road,
Morgantown, WV 26507

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received July 27, 2017; final manuscript received December 14, 2017; published online March 14, 2018. Assoc. Editor: Ashwani K. Gupta.

J. Energy Resour. Technol 140(6), 062202 (Mar 14, 2018) (7 pages) Paper No: JERT-17-1390; doi: 10.1115/1.4039317 History: Received July 27, 2017; Revised December 14, 2017

This paper presents the design, development, and operation of a reactor system for CO2 capture. Modifications were implemented to address differences in sorbent from 180 μm Geldart group B to 115 μm Geldart group A material; operational issues were discovered during experimental trials. The major obstacle in system operation was the ability to maintain a constant circulation of a solid sorbent stemming from this change in sorbent material. The system consisted of four fluid beds, through which a polyamine impregnated sorbent was circulated and adsorption, preheat, regeneration, and cooling processes occurred. Pressure transducers, thermocouples, gas flow meters, and gas composition instrumentation were used to characterize thermal, hydrodynamic, and gas adsorption performance in this integrated unit. A series of shakedown tests were performed and the configuration altered to meet the needs of the sorbent performance and achieve desired target capture efficiencies. Methods were identified, tested, and applied to continuously monitor critical operating parameters including solids circulation rate, adsorbed and desorbed CO2, solids inventories, and pressures. The working capacity and CO2 capture efficiency were used to assess sorbent performance while CO2 closure was used to define data quality and approach to steady-state. Testing demonstrated >90% capture efficiencies and identified the regenerator to be the process step limiting throughput. Sorbent performance was found to be related to the reactant stoichiometry. A stochastic model with an exponential dependence on the relative CO2/amine concentration was used to describe 90% of the variance in the data.

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Fig. 6

Distribution of AX sorbent tests in the operating space relative to the statistically designed composite test matrix

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Fig. 5

Particle size distribution for sorbent AX

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Fig. 4

Particle size distribution for sorbent 32D

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Fig. 3

Evolution of C2 U system

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Fig. 2

Evolution of C2U system

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Fig. 1

Schematic of primary components in original configuration of the C2 U, Mod-0

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Fig. 7

The relationship between solids circulation rate and capture efficiency for all the AX sorbent tests

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Fig. 8

AX data and model comparison

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Fig. 9

Temperature dependence on Weibull shape factor and scale factor

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Fig. 10

Comparison of the 32D data and model prediction

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Fig. 11

Comparison of AX and 32D model predictions at 60 °C




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