This manuscript presents experimental results on the reduction of sulfur oxide emissions from combustion of a high-sulfur content pulverized bituminous coal (Illinois #6 Macoupin) using a dry sorbent injection method. The coal particles were in the size range of 90–125 μm and were blended with calcium-, sodium-, potassium-, and magnesium-containing powdered sorbents at different proportions. The alkali/sulfur molar ratios were chosen to correspond to stoichiometric proportions (Ca/S = 1, Mg/S = 1, Na2/S = 1, and K2/S = 1) and the effectiveness of each alkali or alkali earth based sorbent was evaluated separately. Combustion of coal took place in a drop-tube furnace, electrically heated to 1400 K under fuel-lean conditions. The evolution of combustion effluent gases, such as NOx, SO2, and CO2 was monitored and compared among the different sorbent cases. The use of these sorbents helps to resolve the potential of different alkali metals for effective in-furnace sulfur oxide capture and possible NOx reduction. It also assesses the effectiveness of various chemical compounds of the alkalis, such as oxides, carbonates, peroxides, and acetates. Reductions in SO2 emissions were in the range of 5–72%, with sodium being the most effective metal followed by potassium, calcium, and then magnesium. Acetates were effective as dual SO2 and NOx reduction agents.
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July 2017
Research-Article
In-Furnace Sulfur Capture by Cofiring Coal With Alkali-Based Sorbents
Emad Rokni,
Emad Rokni
Mem. ASME
Department of Mechanical and
Industrial Engineering,
334 SN, Northeastern University,
360 Huntington Avenue,
Boston, MA 02115
e-mail: Rokni.e@husky.neu.edu
Department of Mechanical and
Industrial Engineering,
334 SN, Northeastern University,
360 Huntington Avenue,
Boston, MA 02115
e-mail: Rokni.e@husky.neu.edu
Search for other works by this author on:
Hsun Hsein Chi,
Hsun Hsein Chi
Department of Mechanical
and Industrial Engineering,
334 SN, Northeastern University,
360 Huntington Avenue,
Boston, MA 02115
e-mail: Chi.h@husky.neu.edu
and Industrial Engineering,
334 SN, Northeastern University,
360 Huntington Avenue,
Boston, MA 02115
e-mail: Chi.h@husky.neu.edu
Search for other works by this author on:
Yiannis A. Levendis
Yiannis A. Levendis
Mem. ASME
Department of Mechanical and
Industrial Engineering,
334 SN, Northeastern University,
360 Huntington Avenue,
Boston, MA 02115
e-mail: Y.levendis@northeastern.edu
Department of Mechanical and
Industrial Engineering,
334 SN, Northeastern University,
360 Huntington Avenue,
Boston, MA 02115
e-mail: Y.levendis@northeastern.edu
Search for other works by this author on:
Emad Rokni
Mem. ASME
Department of Mechanical and
Industrial Engineering,
334 SN, Northeastern University,
360 Huntington Avenue,
Boston, MA 02115
e-mail: Rokni.e@husky.neu.edu
Department of Mechanical and
Industrial Engineering,
334 SN, Northeastern University,
360 Huntington Avenue,
Boston, MA 02115
e-mail: Rokni.e@husky.neu.edu
Hsun Hsein Chi
Department of Mechanical
and Industrial Engineering,
334 SN, Northeastern University,
360 Huntington Avenue,
Boston, MA 02115
e-mail: Chi.h@husky.neu.edu
and Industrial Engineering,
334 SN, Northeastern University,
360 Huntington Avenue,
Boston, MA 02115
e-mail: Chi.h@husky.neu.edu
Yiannis A. Levendis
Mem. ASME
Department of Mechanical and
Industrial Engineering,
334 SN, Northeastern University,
360 Huntington Avenue,
Boston, MA 02115
e-mail: Y.levendis@northeastern.edu
Department of Mechanical and
Industrial Engineering,
334 SN, Northeastern University,
360 Huntington Avenue,
Boston, MA 02115
e-mail: Y.levendis@northeastern.edu
1Corresponding author.
Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received November 30, 2016; final manuscript received December 23, 2016; published online March 8, 2017. Editor: Hameed Metghalchi.
J. Energy Resour. Technol. Jul 2017, 139(4): 042204 (7 pages)
Published Online: March 8, 2017
Article history
Received:
November 30, 2016
Revised:
December 23, 2016
Citation
Rokni, E., Hsein Chi, H., and Levendis, Y. A. (March 8, 2017). "In-Furnace Sulfur Capture by Cofiring Coal With Alkali-Based Sorbents." ASME. J. Energy Resour. Technol. July 2017; 139(4): 042204. https://doi.org/10.1115/1.4035752
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