Study on ash fusion temperature using original and simulated biomass ashes

Li, Q.H.; Zhang, Y.G.; Meng, Ai Hong; Li, L.; Li, G.X.

doi:10.1016/j.fuproc.2012.08.012

Cited by 104 publications

(40 citation statements)

References 10 publications

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“…Commonly used analytical techniques include testing the fusion characteristics of ash, measurements of ash viscosity and estimation of indices based on ratios of elemental oxides [8][9][10]. Despite the limitations associated with these techniques, they are still widely used to assess the tendency of various coals to slag and foul boiler heat transfer surfaces and have also been extended to biomass fuels for evaluation of the same [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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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“…Effects of SiO 2 and kaolin on biomass ash fusion characteristics Figure 3 shows that the addition of SiO 2 decreases IDT and ST as opposed to kaolin, which increases the biomass ash fusion temperature. The partial results can be explained by Li's suggestion that increased Si/Al results in a decrease in IDT because Al 2 O 3 is more effective than SiO 2 in increasing ash fusion temperature [13]. Thus, biomass + SiO 2 presents the lowest IDT because of high Si/Al, as shown in Table 1, followed by pure biomass, and biomass + kaolin in turn.…”

Section: Silicate Melt-induced Slaggingmentioning

confidence: 94%

“…To reduce silicate melt-induced slagging, QH Li [13] highlighted that Si 2 O and Al 2 O 3 can increase initial deformation temperature (IDT), whereas increased Si/Al decreases IDT because Al 2 O 3 can more effectively increase ash fusion temperature than SiO 2 [13]. Our early studies show that IDT increases with decreased K 2 O and increased MgO, CaO, Fe 2 O 3 , and Al 2 O 3 in ash [14].…”

Section: Introductionmentioning

confidence: 91%

Experimental study on the coexistent dual slagging in biomass-fired furnaces: Alkali- and silicate melt-induced slagging

Niu

Zhu

Tan

et al. 2015

Proceedings of the Combustion Institute

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“…These ash deposition problems are influenced by ash fusibility which, in turns, associated with ash composition [11][12][13][14][15][16]. So far, there have been a number of works on biomass related ash slagging and deposition tendency [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28], but, there is no directly available tool that predicts ash slagging from biomass. Usually, ash fusibility correlations from coal research are used instead.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, correlations between ash fusion characteristics and ash mineral composition found in coal research may be applicable and equally valid to biomass. Several research studies were conducted for the relationship between biomass ash fusibility and its ash composition [18][19][20][21][22][23][24]26]. Only a handful of these works were directly about slagging indices [19,20,[22][23][24]26].…”

Section: Introductionmentioning

confidence: 99%

Predicting Ash Deposit Tendency in Thermal Utilization of Biomass

Pintana

Tippayawong

2016

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Abstract. In thermochemical utilization of biomass, ash produced during the process is a major problem that can result in decreased performance and increased in difficulty during operation. Preliminary assessment of potential ash related troubles prior to the use of a specific biomass is valuable, even if it is only a general guideline. In this work, tendency of ash slagging, fouling and agglomeration in thermal processing of biomass was evaluated. Reference peered reviewed data including mineral content and fusion temperature of selected biomass ash were used to calculate multiple indicators (base to acid ratio, slagging index, fouling index, agglomeration index, slag viscosity index, and ternary diagram of main biomass ash composition) adopted from coal research. Major ash forming elements (Fe, Ca, Mg, K, Na, Al, Si) were found to be of relevance to ash melting and deposit behavior. For conventional biomass available locally, woody biomass (wood and wood sawdust) may be combusted without slagging or fouling problem, while non-woody biomasses (bark, husk, straw) are highly probable to experience some of these problems. The ash fusibility predictive models for woody and non-woody biomass were found to be effective. Mitigation can then be designed possibly via fuel blending to avoid or minimize the impact of biomass ash related trouble.

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Study on ash fusion temperature using original and simulated biomass ashes

Cited by 104 publications

References 10 publications

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

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

Experimental study on the coexistent dual slagging in biomass-fired furnaces: Alkali- and silicate melt-induced slagging

Predicting Ash Deposit Tendency in Thermal Utilization of Biomass

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