Evaluation of the influence of biomass co-combustion on boiler furnace slagging by means of fusibility correlations

Pronobis, Marek

doi:10.1016/j.biombioe.2004.11.003

Cited by 294 publications

(178 citation statements)

References 5 publications

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“…The chemical composition of the mineral part of sewage sludge indicates its slagging tendency. The sludge ash includes a high amount of iron and phosphorus, which leads to a decrease of the melting temperate of ash [13,14]. The values of Fu and RS indicate that the studied ashes of not have a strong tendency towards the deposition process.…”

Section: Resultsmentioning

confidence: 97%

“…The presence of ash deposit material reduces the heat transfer and combustion efficiency, and damages combustion chambers when large particles break off. There are some empirical indices correlating the functional temperature and standardized chemical composition of ashes, thus making it possible to predict the ash behaviour and deposition tendencies [13][14][15][16] (RB -sum of percentage of basic components, RB/A -ratio of basic to acidic components in ash, RB/A+P -ratio of basic to acidic components with considering phosphorus in ash, SR -viscosity index, RS -slagging index where S d is the percentage of S in dry fuel, Fu -fouling index):…”

Section: Resultsmentioning

confidence: 99%

“…There are some empirical indices for predicting the slagging and fouling tendencies of ash correlating the chemical composition of ash. Most of them have been used for coal as well as biomass ashes [13][14][15] but Wang [16] used it for sewage sludge ashes.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of sewage sludge ashes from air and oxy-fuel combustion in a circulating fluidized-bed

et al. 2016

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Abstract. The ashes from sewage sludge combustion in air versus O2/CO2 atmospheres with oxygen concentrations in the range of 21-40% vol. at temperature of 850°C in a 12 kW bench-scale CFB combustor were characterised. The chemical and phase composition of ashes were studied by XRF and XRD. The morphology of studied ashes were examined by SEM method. The slagging and fouling indices were calculated to study the deposition tendencies of ash. The thermal behaviour of ashes was studied by TG-DSC techniques, focusing on the mass loss and thermic effects with the increasing of temperature up to 1200C.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

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Analysis of sewage sludge ashes from air and oxy-fuel combustion in a circulating fluidized-bed

et al. 2016

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“…The corresponding slagging or fouling tendencies have been marked as severe(S), medium(M), high(H) and low(L) where possible according to data available in literature [34][35][36]. Although the values of R B/A, S R and F U for sunflower ash are rather peculiar owing to its very different composition, they tend to lean towards the high slagging tendencies.…”

Section: Fouling Indexmentioning

confidence: 94%

Prediction of biomass ash fusion behaviour by the use of detailed characterisation methods coupled with thermodynamic analysis

Rizvi

Xing

Pourkashanian

et al. 2015

Fuel

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ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. AbstractAsh deposition such as slagging and fouling on boiler tube surfaces is an inevitable, though undesirable consequence of burning solid fuels in boilers. The role of fuel characteristics, in affecting the form and severity of the problem, is significant. In recent years, biomass fuels have gained increasing popularity as an environmentally friendly source of energy in power plants all over the world. This study is based on characterising the fusion behaviour of four biomass fuels (pine wood, peanut shells, sunflower stalk and miscanthus) using ash fusion temperature (AFT) tests, simultaneous thermal analysis (STA) of fuel ashes, calculation of empirical indices and predicting ash melting behaviour with the help of thermodynamic equilibrium calculations. The AFT results failed to show any clear trend between fusion temperature and high alkali content of biomass. STA proved useful in predicting the different changes occurring in the ash. Empirical indices predicted high slagging and fouling hazards for nearly all the biomass samples and this was supported by the possible existence of a melt phase at low temperatures as predicted by thermodynamic calculations.

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“…So far, the researchers have put forward several slagging and fouling indices to predict the ash behavior during coal combustion process, but previous studies (Pronobis 2005;Teixeira et al 2012) reported that there is a lack of specific indices for evaluation of slagging and fouling tendency during biomass combustion process. Hence, in this study, the slagging and fouling tendency of biomass ash was evaluated according to the empirical indices for predicting the coal ash behavior during coal combustion.…”

Section: Slagging and Fouling Characteristics Of Biomass Ashmentioning

confidence: 99%

The Influence of Ashing Temperature on Ash Fouling and Slagging Characteristics during Combustion of Biomass Fuels

Yao

Yan

et al. 2017

BioResources

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Three typical biomass fuels-rice husk, rice straw, and corn cobs-were combusted to understand the effects of ashing temperature on ash fouling and slagging characteristics. The ashes generated from combustion at 600 °C and 815 °C were characterized thoroughly with regard to their chemical composition. The systematic slagging/fouling indices of biomass were used to study the effects of ashing temperature on ash fouling and slagging propensities. The results showed that ashing temperature had a remarkable influence on ash composition, particle size distribution, ash morphology, ash fusibility, and thermal properties. Increased ashing temperature resulted in the expansion of ash particles together with the volatilization of alkali metals in the form of inorganic salts. Morphology analysis indicated that high ashing temperatures promoted biomass ash slagging. Ash fusion points increased at elevated ashing temperatures, while the ash content decreased. As a result of the volatilization and decomposition of biomass ash, a four-step mechanism of weight loss was clearly identified by thermal analysis. All prepared biomass ashes resulted in slagging and fouling problems at different levels during the thermochemical conversion of biomass.

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Evaluation of the influence of biomass co-combustion on boiler furnace slagging by means of fusibility correlations

Cited by 294 publications

References 5 publications

Analysis of sewage sludge ashes from air and oxy-fuel combustion in a circulating fluidized-bed

Analysis of sewage sludge ashes from air and oxy-fuel combustion in a circulating fluidized-bed

Prediction of biomass ash fusion behaviour by the use of detailed characterisation methods coupled with thermodynamic analysis

The Influence of Ashing Temperature on Ash Fouling and Slagging Characteristics during Combustion of Biomass Fuels

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