Coal alkali retention in a slagging combustor

Wen, C. S.; Cowell, L. H.; Smit, F.J.; Boyd, Jeff D; LeCren, R. T.

doi:10.1016/0016-2361(92)90012-d

Cited by 13 publications

(4 citation statements)

References 3 publications

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“…The gaseous alkali metals, mainly including sodium (Na) and potassium (K) released from the combustion of high alkali fuels such as Zhundong coal and biomass, causes fouling and slagging problems on heating surface of furnaces, which can significantly affect the operation safety [1,2]. A past investigation found that much sodium could be retained with the molten slag in the fuel-rich primary combustion zone in a slagging combustor [3]. In a recent research, the slagging-type cyclone combustion is also proved to be suitable for the Zhundong coal combustion because of the suppression of the molten slag on sodium diffusion [4].…”

Section: Introductionmentioning

confidence: 99%

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

Jing

Li³

et al. 2022

Energies

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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.

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Section: Introductionmentioning

confidence: 99%

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

Jing

Li³

et al. 2022

Energies

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“…Kaolin and silica-enriched bauxite have shown the best ability to sufficiently remove the alkalis which are bonded in a melt/glass phase formed during alkali sorption. On the other hand, it was found that coal ash and slag have a high potential of capturing alkali metals released during combustion – . As the installation and operation of an alkali removal unit would increase both investment and operational costs of a future PPCC power plant, it is desirable to capture most of the alkalis with the coal ash during combustion.…”

Section: Introductionmentioning

confidence: 99%

“…4 On the other hand, it was found that coal ash and slag have a high potential of capturing alkali metals released during combustion. [5][6][7] As the installation and operation of an alkali removal unit would increase both investment and operational costs of a future PPCC power plant, it is desirable to capture most of the alkalis with the coal ash during combustion.…”

Section: Introductionmentioning

confidence: 99%

Influence of Coal Composition and Operating Conditions on the Release of Alkali Species During Combustion of Hard Coal

Oleschko¹,

Müller²

2007

Energy Fuels

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In solid fuel conversion systems, the release of alkali species can cause severe problems such as fouling, slagging, corrosion, and erosion. Especially in future coal-fired combined cycle processes such as pressurized pulverized coal combustion (PPCC), alkali species can cause corrosion of the gas turbine blading. In order to solve these problems, detailed information about the alkali release is required. In this work, the influence of coal composition and operating conditions on the release of alkali species is investigated. For this reason, laboratory combustion experiments with six different hard coals were conducted at temperatures of 800 and 1200 °C and absolute pressures of 1, 3, and 9 bar. High pressure mass spectrometry (HPMS) was used for online analysis of combustion products such as HCl, NaCl, KCl, SO 2 , and Na 2 SO 4 . In addition, two of the coals were subjected to a leaching procedure. Thermodynamic equilibrium calculations with the software package FactSage 5.4 and the FACT database were conducted for comparison with the experimental findings.

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“…First investigations to prepare to called "Multiplex Dyes" were carried out with rhodamine dyes. These compounds are in general highly fluorescent owing to their structural rigidity [9]. We started our investigations with rhodamine 630 (Fig.…”

Section: Introductionmentioning

confidence: 99%

Determination of Alkali Traces in Coal Combustion by Excimer Laser Induced Fragmentation Fluorescence

Hartinger

Monkhouse

Wolfrum

1993

Ber Bunsenges Phys Chem

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Gas phase sodium concentrations were measured in situ in the flue gas of a fluidised bed reactor using the excimer laser induced fragmentation fluorescence (ELIF) technique. Several different coals were investigated for a fixed set of reactor conditions at ∼ 1 bar total pressure. Measured signals were converted to absolute concentrations using a calibration system that monitors alkali compounds under well‐defined conditions. Concentrations ranging from the sub‐ppb region to 25 ppb were obtained. Contrasting concentration histories were observed for the brown and hard coals studied.

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Coal alkali retention in a slagging combustor

Cited by 13 publications

References 3 publications

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

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

Influence of Coal Composition and Operating Conditions on the Release of Alkali Species During Combustion of Hard Coal

Determination of Alkali Traces in Coal Combustion by Excimer Laser Induced Fragmentation Fluorescence

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