A Review of On-Line Measurement Methods of Alkali Metal Emissions from Combustion by Passive Spontaneous Emission Spectroscopy

Weihui Liao, Chao Yan, Xingcheng Lyu, Yang Pu, Chun Lou and Mooktzeng Lim
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Weihui Liao: Guangdong Red Bay Generation Co., Ltd., Shanwei 516623, China
Chao Yan: Guangdong Red Bay Generation Co., Ltd., Shanwei 516623, China
Xingcheng Lyu: Guangdong Red Bay Generation Co., Ltd., Shanwei 516623, China
Yang Pu: State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Chun Lou: State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Mooktzeng Lim: Department of Mechanical Engineering, Faculty of Engineering and Quantity Surveying, INTI International University & Colleges, Nilai 71800, Negeri Sembilan, Malaysia

Energies, 2022, vol. 15, issue 24, 1-13

Abstract: This article reviews the principles and applications of passive spontaneous emission spectroscopy (SES) for the quantitative determination of alkali metal concentrations emitted from combustion processes. The combustion of fuels that contain a high alkali metal content (Na and/or K) is challenging, as alkali metals reduce the slag formation temperature and induce fouling, causing combustion facilities to shutdown prematurely. The in situ on-line quantification of alkali metals is, thus, a critical measure to control combustion processes, preventing slagging and fouling from occurring. This review shows that several SES systems, developed by the Huazhong University of Science and Technology (HUST), are inexpensive, portable, and useful for measuring the alkali metal content, and have been applied for biomass combustion as well as coal and municipal solid waste combustion, from laboratory-scale settings (20 kW) to industrial facilities (300 MW). Compared with other research, the SES system from HUST has successfully quantified the emitted alkali metal concentrations during combustion. This review also highlights the challenges of the SES system and recommends further work to improve it for further applications.

Keywords: high-alkali fuels; gaseous alkali metal concentration; temperature; on-line measurement; spontaneous emission spectroscopy (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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