Study of ash deposition during coal combustion under oxyfuel conditions

Fryda, Lydia; Sobrino, C.; Glazer, M. P.; Bertrand, C.; Cieplik, M.K.

doi:10.1016/j.fuel.2011.08.013

Cited by 59 publications

(45 citation statements)

References 33 publications

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“…X‐ray diffraction (XRD) and comparative analysis of fly ash collected from Oxy and Air atmospheres were carried out at the same oxygen concentration . It was found that the O 2 /CO 2 atmosphere did not significantly affect the kinds of minerals produced in the particles, but the relative content was clearly affected, which is consistent with the literature . As a result of XRD analysis of fly ash collected in the combustion simulator, it was concluded that the combustion condition (Oxy or Air) had no effect on the mineral species in the particles and slagging under the Oxy condition was more serious than that under the Air condition.…”

Section: Introductionsupporting

confidence: 78%

“…20 It was found that the O 2 /CO 2 atmosphere did not significantly affect the kinds of minerals produced in the particles, but the relative content was clearly affected, which is consistent with the literature. 21 As a result of XRD analysis of fly ash collected in the combustion simulator, it was concluded that the combustion condition (Oxy or Air) had no effect on the mineral species in the particles and slagging under the Oxy condition was more serious than that under the Air condition. Wall et al 22 found that under the Oxy and Air atmospheres, there was no significant difference in the distribution of particle sizes, but the density of particles under the Oxy condition was 1.5 times that under the Air condition.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study of ash formation under O₂/CO₂ combustion

Zhang

Liao

et al. 2019

Greenhouse Gases

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Oxy‐fuel combustion technology has been recognized as the most promising technology for controlling CO2 emission in coal‐fired boilers. The slagging characteristics of oxy‐fuel combustion (O2/CO2) are very different from those of air combustion (O2/N2). In this paper, an ash sample collection of Shenhua coal with high Ca and Fe content was carried out in a muffle furnace and a tubular furnace under different conditions. The ash melting point, X‐ray diffraction (XRD) and scanning electron microscopy (SEM) were used for characterization. The characteristics of Shenhua coal ash slagging in different atmospheres were studied, and the mineral transformation trend was obtained. It was concluded that the melting point of the ash samples under oxy‐fuel combustion was lower than that under an air atmosphere, and the slagging tendency was enhanced under conditions of high oxygen combustion. Under oxy‐fuel combustion, CaCO3 was found. This did not occur under an air atmosphere. The atmosphere has no obvious effect on the crystal minerals of Fe. The decrease in high melting point oxide, the formation of carbonate, and the increase in glass state and sulfate under an oxy‐fuel atmosphere all make the ash melting point lower than under an air atmosphere. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Section: Introductionsupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Experimental study of ash formation under O₂/CO₂ combustion

Zhang

Liao

et al. 2019

Greenhouse Gases

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“…Only a few studies [10][11][12][13][14][15][16][17][18][19] have focused on ash aerosol and ash deposition formation during oxy-coal combustion. Bench-scale experiments [10][11][12] on a drop tube furnace (DTF) have probed the effects of combustion conditions and oxygen proportions in O2/CO2 combustion on the ash aerosol.…”

Section: Introductionmentioning

confidence: 99%

“…As far as ash deposition is concerned, some studies [13][14][15][16][17][18][19] for oxy-coal combustion have raised disparate conclusions, due to variations in experimental equipment, deposition probe conditions, combustion conditions, and coal types. Required is an experimental system in which both combustion conditions and collection devices for deposits are systematically controlled.…”

Section: Introductionmentioning

confidence: 99%

“…One would expect that deposit chemistry would be related to the size segregated composition of the ash aerosol. Yet, even though multiple discrepancies exist in ash aerosol studies and in deposit studies [10][11][12][13][14][15][16][17][18][19] for oxy-coal combustion conditions, and there have been no attempts to directly relate particle size resolved details of the ash aerosol to temporal details of how the ash deposits were formed. Therefore, in this study size segregated aerosol composition data, PSD data and temporally resolved deposit composition data were obtained, and connections between all of these factors were inferred.…”

Section: Introductionmentioning

confidence: 99%

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Ash aerosol formation from oxy-coal combustion and its relation to ash deposit chemistry

Zhan

Fry

Zhang

et al. 2015

Proceedings of the Combustion Institute

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Ash aerosol and ash deposit formation during oxy-coal combustion were explored through experiments in a self-sustained 100 kW rated down-fired oxy-fuel combustor. Inlet oxidant conditions consisted of 50% inlet oxygen with CO2 (hereafter denoted as OXY50 conditions). A Berner low pressure impactor (BLPI), a scanning mobility particle sizer (SMPS), and an aerodynamic particle sizer (APS) were used to obtain size segregated ash aerosol samples and to determine the particle size distributions (PSD). A novel surface temperature controlled ash deposition probe system that allowed inside and outside deposits to be separated was used to collect the ash deposits. The ash aerosol PSDs given by the BLPI and those produced by SMPS/APS were consistent with each other. Data suggested that oxy-coal combustion under these conditions did not change the formation mechanisms controlling the bulk ash aerosol composition, but it did increase the formation of ultra-fine particles initially formed through metal vaporization, due to increased vaporization of silicon at the higher combustion temperature. The smaller particles contained within the deposits had higher Si and lower Na and S concentrations under OXY50 conditions than for air combustion. Moreover, the ash aerosol composition for particle sizes less than 2.4 μm was related to the composition of the inside deposits. A higher Na in the ash aerosol resulted in higher Na in inside deposits with comparable absolute Na concentrations in both those aerosol particles and those inside deposits particles. The contribution of S and Si to the inside deposits showed that S in the vaporization modes together with Si in the ultrafine vaporization mode, contributed significantly to the composition of the inside deposits. These results provided direct evidence that prediction of the chemistry of the initial deposit layer (but not of the bulk deposits) required knowledge of the size segregated chemistry of the ash aerosol.

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A novel method used to study growth of ash deposition and in situ measurement of effective thermal conductivity of ash deposit

Zheng

Wang

Cai

et al. 2017

Heat Trans. Asian Res.

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Ash deposition always brings boilers some trouble due to fouling or slagging. In this paper, a completely controlled system was developed to study the growth of ash deposit. A novel sampling probe was designed to online measure the heat flux through ash deposit. Additionally, the thickness of ash deposit can be obtained by an online figure collecting system. The results of this research showed that as the thickness of ash deposit increased, the heat flux decreased. It was also found that at the initial stage of ash deposition when the thickness of ash deposit is approximately 1 mm, the heat flux through ash deposit had a sharp reduction. An effective method was attempted to situ measure the effective thermal conductivity of the ash deposit in the simulated combustion flue gas. It was found that temperature of the ash deposit layer had no obvious effect on its value. It was concluded that the structure of ash deposit had no obvious change in a short deposition time of 30 min with varied surface temperatures of the probe head between 400 °C and 600 °C.

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Study of ash deposition during coal combustion under oxyfuel conditions

Cited by 59 publications

References 33 publications

Experimental study of ash formation under O₂/CO₂ combustion

Experimental study of ash formation under O₂/CO₂ combustion

Ash aerosol formation from oxy-coal combustion and its relation to ash deposit chemistry

A novel method used to study growth of ash deposition and in situ measurement of effective thermal conductivity of ash deposit

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Study of ash deposition during coal combustion under oxyfuel conditions

Cited by 59 publications

References 33 publications

Experimental study of ash formation under O2/CO2 combustion

Experimental study of ash formation under O2/CO2 combustion

Ash aerosol formation from oxy-coal combustion and its relation to ash deposit chemistry

A novel method used to study growth of ash deposition and in situ measurement of effective thermal conductivity of ash deposit

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Experimental study of ash formation under O₂/CO₂ combustion

Experimental study of ash formation under O₂/CO₂ combustion