Experimental Investigation of Gaseous Sodium Release in Slag-Tapping Coal-Fired Furnaces by Spontaneous Emission Spectroscopy

Xuehui Jing, Yang Pu, Zhaoyu Li, Quanli Tang, Bin Yao, Peifang Fu, Chun Lou and Mooktzeng Lim
Additional contact information
Xuehui Jing: Xinjiang Xinneng Group Company Limited, Urumqi Electric Power Construction Commissioning Institute, Urumqi 830000, China
Yang Pu: State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Zhaoyu Li: Electric Power Research Institute of Xinjiang Power Grid Corporation, Urumqi 830000, China
Quanli Tang: Xinjiang Xinneng Group Company Limited, Urumqi Electric Power Construction Commissioning Institute, Urumqi 830000, China
Bin Yao: State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Peifang Fu: 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: Biomass and Plasma Technologies, Renewable Energy and Green Technology, TNB Research Sdn. Bhd., Research Institution Area, Kajang 43000, Selangor, Malaysia

Energies, 2022, vol. 15, issue 11, 1-11

Abstract: High-alkali coal is rich in alkali metals, which can cause serious effects such as slagging and corrosion on the heating surface during combustion and utilization. A portable spectral system was utilized to simultaneously measure gaseous Na concentration and temperature in a 20 kW slag-tapping combustor and a slagging boiler furnace of a 300 MW power generation unit by flame spontaneous emission spectroscopy (FES) for simultaneous measuring. The result shows that both ZD-FK and ZD-HSQ (Fukang coal and Hongshaquan coal, Xinjiang Zhundong high-alkali coal) combustion flame temperatures are around 1400 °C at the outlet of the cyclone burner while the latter is slightly higher. The sodium concentration in the gas phase increases with the rising of the initial combustion temperature and unit load for one kind of coal, and the level of sodium concentration has a strong correlation with the Na content for different coal. Most of the sodium in the high temperature zone of the furnace exists in the form of gas phase, and more sodium migrates to fly ash. Combined with the analysis of fly ash and liquid slag samples, a closed-loop analysis of the Na migration path could be established.

Keywords: slag-tapping furnace; high alkali coal; gaseous sodium concentration; temperature; 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
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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