Control of ash deposition in solid fuel fired boiler

Naganuma, Hiroshi; Ikeda, Nobuya; Ito, Tadashi; Satake, Hideshi; Matsuura, Motoharu; Ueki, Yasuaki; Yoshiie, Ryo

doi:10.1016/j.fuproc.2011.09.009

Cited by 32 publications

(18 citation statements)

References 8 publications

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“…Consequently, it indicated that the adhesion forces between the deposits and different surfaces were different, sorted in following order: Case 1 > Case 2. Some researchers also found that the adhesion forces between the deposits and the surface were influenced by coatings …”

Section: Resultssupporting

confidence: 51%

“…Some researchers also found that the adhesion forces between the deposits and the surface were influenced by coatings. 19,20 However, the shedding was so frequent in Case 2 that it was difficult to compare the thickness data of the two cases. Therefore, the average thickness was selected to compare with each other.…”

Section: The Growth Of the Fouling Depositsmentioning

confidence: 99%

“…Naganuma et al, 16 Naruse et al, 17,18 and Chen 19 investigated the influence of some modified surfaces on ash deposit characteristics with the online weighting technique. 20 The additives had been applied to mitigate the fouling deposition. 21,22 The washing pretreatment is also a good way to reduce the deposition.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study of the fouling characteristics in a pilot‐scale facility: Influence of the fouling surface

Zhou

Zhang

et al. 2018

Asia-Pacific J Chem Eng

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Fouling on the heat transfer tube is one of the most serious problems in the boiler for its low thermal conductivity. The fouling characteristics in a pilot‐scale facility were investigated, including the influence of the fouling surface. The digital image technique was utilized to study the growth characteristic of the fouling deposit. Meanwhile, the heat flux through the heat exchange tube was calculated. The X‐ray diffraction and scanning electron microscopy (SEM) were applied to investigate the mineralogy and microstructure of the deposits. The results showed that the modified surface could inhibit the fouling and promoted the shedding processing of fouling deposit. The average thicknesses of the fouling deposits decreased as the deposition surface was modified with ceramic coating. In addition, the average heat fluxes of the two cases were 183.15 and 226.35 kW/m2 for two cases (noncoating and ceramic coating), respectively. The reduction mechanisms of the fouling deposit were studied. We observed that the modified surface had negative impacts on the content of alkalis, which strongly affected the adhesion behavior. According to the SEM images, the deposition presented a more porous structure with the ceramic coating. This research provides the guidance for mitigation of the fouling in boilers.

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Section: Resultssupporting

confidence: 51%

Section: The Growth Of the Fouling Depositsmentioning

confidence: 99%

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Experimental study of the fouling characteristics in a pilot‐scale facility: Influence of the fouling surface

Zhou

Zhang

et al. 2018

Asia-Pacific J Chem Eng

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“…In light of this challenging scenario, several authors have pursued efficient coatings to prevent the high temperature corrosion of metallic materials in biomass fueled boilers and waste incinerators [114][115][116]. Hearley et al [117] showed that coatings produced by the high velocity oxygen fuel (HVOF) thermal spray process form effective barrier against high temperature corrosion.…”

Section: Coatingsmentioning

confidence: 99%

Corrosion in biomass combustion: A materials selection analysis and its interaction with corrosion mechanisms and mitigation strategies

2013

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“…Deposits derived from the minerals and inorganic components of coal can cause operational problems. The ash deposition causes heat transfer inhibition due to both slagging and fouling phenomena, which become a trigger of the boiler operation troubles (16,17). The slagging behaviour involves the coal ash being partly fragmented and becoming molten during combustion, and then it adheres to the tube surface.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Temperature Distribution on Tube Rupture

Aydin

Durak

2012

JTST

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This paper reports the effect of temperature distribution on tube rupture at the pulverized coal fired thermal power plant. A computational model was applied to a 150 MWe boiler burning high-ash, medium-volatile coal. The radial and axial flame temperature distribution in the boiler was simulated using CFD code FLUENT. Flame temperatures were measured at points close to wall in some boiler levels and compared with computational fluid dynamics (CFD) solutions. CFD analysis showed that the flame shaped in the centre of the boiler and the temperature decreased gradually towards the boiler walls. The coal and ash composition was analyzed, and tube thickness was measured. Analysis showed that the ash and chlorine content of the coal, and SiO 2 content of the ash were very high. Deposits on tubes can occur overheating, fouling and slagging which lead to tube ruptures. The abrasive effect of the ash accelerated thinning of the tubes and caused them to rupture.

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Control of ash deposition in solid fuel fired boiler

Cited by 32 publications

References 8 publications

Experimental study of the fouling characteristics in a pilot‐scale facility: Influence of the fouling surface

Experimental study of the fouling characteristics in a pilot‐scale facility: Influence of the fouling surface

Corrosion in biomass combustion: A materials selection analysis and its interaction with corrosion mechanisms and mitigation strategies

The Effect of Temperature Distribution on Tube Rupture

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