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Energies
Volume 13
Issue 19
10.3390/en13195077
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Article

Reduction of Unburned Carbon Release and NOx Emission from a Pulverized Wood Pellet Boiler Retrofitted for Fuel Switching from Coal

by
Jiseok Lee
1,†,
Seunghan Yu
1,†,
Jinje Park
1,
Hyunbin Jo
1,
Jongkeun Park
1,
Changkook Ryu
1,* and
Yeong-gap Jeong
2
1
School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Korea
2
Human Resource T/D Institute, Korea South-East Power Co., Jinju 52852, Korea
*
Author to whom correspondence should be addressed.
†
These authors contributed equally to this work.
Energies 2020, 13(19), 5077; https://doi.org/10.3390/en13195077
Submission received: 7 August 2020 / Revised: 22 September 2020 / Accepted: 22 September 2020 / Published: 28 September 2020
(This article belongs to the Section B: Energy and Environment)
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Abstract

For renewable electricity production, biomass can fully displace coal in an existing power plant with some equipment modifications. Recently, a 125 MWe power plant burning mainly anthracite in Korea was retrofitted for dedicated wood pellet combustion with a change of boiler configuration from arch firing to wall firing. However, this boiler suffers from operational problems caused by high unburned carbon (UBC) contents in the bottom ash. This study comprises an investigation of some methods to reduce the UBC release while achieving lower NOx emissions. The computational fluid dynamics approach was established and validated for typical operating data. Subsequently, it was applied to elucidate the particle combustion and flow characteristics leading to the high UBC content and to evaluate the operating variables for improving the boiler performance. It was found that the high UBC content in the bottom ash was a combined effect of the poor fuel grindability and low gas velocity in the wide burner zone originating from the arch-firing boiler. This prevented the operation with deeper air staging for lower NOx emissions. Reducing the particle size to <1.5 mm by modifying mills or pretreating the fuel using torrefaction was the only effective way of lowering the UBC and NOx emissions with deeper air staging while increasing the boiler efficiency.
Keywords: wood pellet; combustion; unburned carbon; NOx emission; wall-firing boiler; computational fluid dynamics wood pellet; combustion; unburned carbon; NOx emission; wall-firing boiler; computational fluid dynamics
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MDPI and ACS Style

Lee, J.; Yu, S.; Park, J.; Jo, H.; Park, J.; Ryu, C.; Jeong, Y.-g. Reduction of Unburned Carbon Release and NOx Emission from a Pulverized Wood Pellet Boiler Retrofitted for Fuel Switching from Coal. Energies 2020, 13, 5077. https://doi.org/10.3390/en13195077

AMA Style

Lee J, Yu S, Park J, Jo H, Park J, Ryu C, Jeong Y-g. Reduction of Unburned Carbon Release and NOx Emission from a Pulverized Wood Pellet Boiler Retrofitted for Fuel Switching from Coal. Energies. 2020; 13(19):5077. https://doi.org/10.3390/en13195077

Chicago/Turabian Style

Lee, Jiseok, Seunghan Yu, Jinje Park, Hyunbin Jo, Jongkeun Park, Changkook Ryu, and Yeong-gap Jeong. 2020. "Reduction of Unburned Carbon Release and NOx Emission from a Pulverized Wood Pellet Boiler Retrofitted for Fuel Switching from Coal" Energies 13, no. 19: 5077. https://doi.org/10.3390/en13195077

APA Style

Lee, J., Yu, S., Park, J., Jo, H., Park, J., Ryu, C., & Jeong, Y.-g. (2020). Reduction of Unburned Carbon Release and NOx Emission from a Pulverized Wood Pellet Boiler Retrofitted for Fuel Switching from Coal. Energies, 13(19), 5077. https://doi.org/10.3390/en13195077

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