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Research Papers: Fuel Combustion

The Effect of Thermal Treatment of Hematite Ore for Chemical Looping Combustion of Methane

[+] Author and Article Information
Ronald W. Breault

National Energy Technology Laboratory,
U.S. Department of Energy,
3610 Collins Ferry Road,
Morgantown, WV 26507-0880
e-mail: ronald.breault@netl.doe.gov

Cory S. Yarrington, Justin M. Weber

National Energy Technology Laboratory,
U.S. Department of Energy,
3610 Collins Ferry Road,
Morgantown, WV 26507-0880

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received August 14, 2015; final manuscript received October 30, 2015; published online December 15, 2015. Assoc. Editor: Terry Wall. This material is declared a work of the U.S. Government and is not subject to copyright protection in the United States. Approved for public release; distribution is unlimited.

J. Energy Resour. Technol 138(4), 042202 (Dec 15, 2015) (8 pages) Paper No: JERT-15-1309; doi: 10.1115/1.4032018 History: Received August 14, 2015; Revised October 30, 2015

For chemical looping processes to become an economically viable technology, an inexpensive carrier that can endure repeated reduction and oxidation cycles needs to be identified or developed. Unfortunately, the reduction of hematite ore with methane in both batch and fluidized beds has revealed that the performance (methane conversion) decreases with time. Previous analysis had shown that the grains within the particle grew with the net effect of reducing the surface area of the particles and thereby reducing the rate and net conversion for a fixed reduction time. To improve the lifespan of hematite ore, it is hypothesized that if the grain size could be stabilized, then the conversion could be stabilized. In this work, series of tests were conducted in an electrically heated fluidized bed. The hematite ore was first pretreated at a temperature higher than the subsequent reduction temperatures. After pretreatment, the hematite ore was subjected to a series of cyclic reduction/oxidation experiments. The results show that the ore can be stabilized for cycles at different conditions up to the pretreatment temperature without any degradation. Details of the pretreatment process and the test results will be presented.

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Figures

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Fig. 1

Experimental test facility

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Fig. 2

Typical cycle operation

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Fig. 3

Untreated carrier CH4 and CH4 conversion levels over 25 cycles

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Fig. 4

Untreated carrier, local maximum CH4 levels over 25 cycles

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Fig. 5

Effect of 850 °C thermal pretreatment temperature

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Fig. 6

Effect of 950 °C thermal pretreatment temperature

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Fig. 7

Comparison of 850 °C and 950 °C thermal pretreatment temperatures

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Fig. 8

Thermal pretreatment cycles fluctuate around average

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Fig. 9

Langmuir surface area of pretreated and nonpretreated carrier

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Fig. 10

Thermal exposure effects on hematite

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Fig. 11

Surface area of thermally pretreated hematite material before reduction

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Fig. 12

Development of lath structure into hematite material

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Fig. 13

Peak CH4% over 80 cycles

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