Analysis of fly ash composition from different flue gas desulfurization processes and prospects for resource utilization technology

LI Bin; LONG Jisheng; LIU Jun

doi:10.13205/j.hjgc.202504025

Volume 43 Issue 4

Apr. 2025

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2025 > 43(4): 251-257

LI B，LONG J S，LIU J.Analysis of fly ash composition from different flue gas desulfurization processes and prospects for resource utilization technology［J］.Environmental Engineering，2025，43（4）：251-257. doi: 10.13205/j.hjgc.202504025

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Analysis of fly ash composition from different flue gas desulfurization processes and prospects for resource utilization technology

doi: 10.13205/j.hjgc.202504025

LI Bin²,
LONG Jisheng^{1,2
,
,},
LIU Jun¹

1. College of Energy and Power Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, China;
2. Shanghai SUS Environment Co., Ltd., Shanghai 201703, China

Received Date: 2024-12-10
Accepted Date: 2025-02-21
Rev Recd Date: 2025-01-15
Publish Date: 2025-04-01

Abstract

Abstract

The composition and chemical properties of MSWI fly ash are influenced by the type of incinerator and flue gas treatment process. Changes in acid removal processes and agents can cause variations in fly ash composition， posing challenges for future fly ash resource utilization. As the national WtE flue gas pollutants emissions standards become increasingly stringent， the application of sodium bicarbonate dry flue gas treatment （FGT） technology for acid removal is gradually increasing. However， there is a lack of research on the characteristics of fly ash produced by sodium bicarbonate dry acid removal process， and the prospects for the potential of fly ash resource utilization require further exploration. We compared fly ash samples from the existing SDA semi-dry process flue gas treatment system and the pilot-scale flue gas treatment system using the sodium bicarbonate dry method at a WtE plant in Zhejiang. Additionally， we also conducted fly ash desalination tests by water washing， analyzed the components and mass differences of two types of fly ash before and after water washing， tested the components of the washed water， and analyzed the cost differences and prospects for resource utilization of salts removal by water washing for the two types of fly ash. The results showed that， compared with the calcium-based fly ash from the original flue gas treatment process， the fly ash from the sodium bicarbonate dry method flue gas treatment process was primarily sodium-based. It contained soluble chloride salts， such as NaCl and Na₂SO₄， with a significant reduction in the content of CaCl₂ and CaClOH. After water washing， the fly ash produced by the sodium bicarbonate dry method flue gas treatment process can be reduced by more than 79%， making it more promising for resource recovery. This is conducive for achieving deep reduction and resource recovery for fly ash.
- fly ash,
- residual sodium chemicals,
- water washing,
- chlorides,
- waste water treatment

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References(18)

References

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