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Emission Characteristics of Hazardous Atmospheric Pollutants from Ultra-low Emission Coal-fired Industrial Boilers in China

Category: Control Techniques and Strategy

Accepted Manuscripts
DOI: 10.4209/aaqr.2019.10.0531
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To cite this article:
Yue, T., Wang, K., Wang, C., Tong, Y., Gao, J., Zhang, X., Zuo, P., Tong, L. and Liang, Q. (2020). Emission Characteristics of Hazardous Atmospheric Pollutants from Ultra-low Emission Coal-fired Industrial Boilers in China. Aerosol Air Qual. Res., doi: 10.4209/aaqr.2019.10.0531.

Tao Yue1,2, Kun Wang 1,3, Chenlong Wang1, Yali Tong1,3, Jiajia Gao 1, Xiaoxi Zhang1, Penglai Zuo1, Li Tong1, Quanming Liang1

  • 1 Department of Air Pollution Control, Beijing Municipal Institute of Labour Protection, Beijing 100054, China
  • 2 State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310058, China
  • 3 Key Laboratory of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China

Highlights

  • Release ratios of trace elements from feed coal was obtained.
  • Relative enrichment factors of trace elements in bottom ash was obtained.
  • EFs and removal efficiency of hazardous atmospheric pollutants were given.
  • The emission intensity of ULE and non-ULE coal-fired boilers were compared.

Abstract

In this study, the emission characteristics of primary air pollutants (PM, SO2 and NOx) and trace elements (As, Cd, Cr, Hg and Pb) were comprehensively investigated based on the field measurements of nine ultra-low emission (ULE) coal-fired industrial boilers and three non-ULE coal-fired industrial boilers. The concentrations, release ratios and relative enrichment factors (REFs) of trace elements in both coal and bottom ash were obtained, which is constructive to know the release and enrichment features of trace elements from the ULE coal-fired industrial boilers. Furthermore, the influence of atmospheric pollutant control devices (APCDs) on the emission concentrations, removal efficiency, as well as the emission factors (EFs) of primary air pollutants and trace elements were analyzed. The average release ratios of Hg, Cr, Pb and As from coal were 96.28%, 59.95%, 65.34% and 84.85%, respectively. The average overall removal efficiency of PM, SO2, NOx, Hg, Cr, Pb and As for APCD configurations in the ULE coal-fired industrial boilers in this study were 99.5%, 95.9%, 81.0%, 95.6%, 95.6%, 99.3% and 96.0%, respectively. The NOx EFs of selective non-catalytic reduction (SNCR) and hybrid of selective noncatalytic reduction and selective catalytic reduction (SNCR-SCR) in the ULE coal-fired industrial boilers were 5.5 × 10 -1 kg t-1 and 4.9 × 10 -1 kg t-1, respectively. Overall, the removal efficiency of NOx and Hg for ULE coal-fired boilers were 2.1 and 2.8 times higher than non-ULE coal-fired industrial boilers, respectively, which is mainly caused by the higher denitrification efficiency, higher dedust efficiency and higher liquid/gas (L/G) ratio of desulfurization of ULE coal-fired boilers.

Keywords

Ultra-low emission Coal-fired industrial boilers Emission characteristics Trace elements Relative enrichment factors


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