Abstract
This study explores the synergistic removal effect of various schemes based on demisters on boiler flue gas dust on a pilot-scale experimental bench. The results show that the dust removal efficiency is 28.43–51.30% when demisters are put into operation alone; the larger the inlet dust concentration of demisters is, the higher the dust removal efficiency will be; but it still cannot reach the 10 mg/Nm3 ultra-low emission standard. The dust removal efficiency is 93.13% when wet electro-static precipitator and demisters are put into operation simultaneously. Furthermore, the outlet dust concentration is lower than 5 mg/Nm3, and the dust removal efficiency of the demisters themselves increases to 67.28%, which has shown a significant improvement compared with operation alone. The dust removal efficiency is 70.98–78.37% when the water-washing layer and demisters are put into operation simultaneously. Moreover, the outlet dust concentration reaches the standard of 10 mg/Nm3 when the liquid–gas ratio (L/G) is more than 3.5. This research shows that when the inlet dust concentration is ≤ 35 mg/Nm3, the method of “water-washing layer + demisters” can be used as an equivalent alternative to the wet electro-static precipitator when L/G ≥ 3.5, which has reference value for reducing the construction cost of ultra-low emission reformation.
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Funding
This work was supported by the Aerospace Technology Application Industry R&D Project of The Sixth Research Institute of China Aerospace Science and Technology Corporation (No. 2019F0020YXTB) and the Key Science and Technology Project of China National Coal Group CORP. (No. 17–37).
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Yi **ang conducted data analysis and wrote and revised the manuscript. Di Wu conducted the experiments and revised the manuscript. Guohua Yang revised the manuscript. Yanyan Chen reviewed the data. Wenhao Lyu conducted supplementary experiments.
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**ang, Y., Wu, D., Yang, G. et al. Pilot study on demister-based dust removal methods for boiler flue gas. Environ Sci Pollut Res 30, 37570–37578 (2023). https://doi.org/10.1007/s11356-022-24840-6
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DOI: https://doi.org/10.1007/s11356-022-24840-6