Action of the Products of Biofuel Combustion on the Phase Composition and Structure of Refractory Material

Kerienė, Jadvyga; Boris, Renata; Antonoviè, V.; Stonys, Rimvydas; Škamat, Jelena

doi:10.1007/s10717-016-9788-9

Cited by 7 publications

(6 citation statements)

References 14 publications

(18 reference statements)

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“… 37 The reaction of alkali metals with silicon and aluminum oxides might have occurred via aerosol collisions prior to deposition on superheater surfaces and, subsequently, within the refractory materials ( reaction R14 ). 38 …”

Section: Resultsmentioning

confidence: 99%

Modeling and Evaluation of Ash-Forming Element Fate and Occurrence in Woody Biomass Combustion in an Entrained-Flow Burner

et al. 2022

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Biomass combustion equipment is often susceptible to ash deposition due to the relatively significant quantities of potassium, silicon, and other ash-forming elements in biomass. To evaluate the propensity for ash deposition resulting from biomass combustion, a biomass combustion model was integrated with a chemical equilibrium model to predict the fate and occurrence of ash-forming elements in a pilot-scale entrained-flow burner. The integrated model simulated the combustion of white wood (virgin wood) and recycled wood (treated wood) previously combusted in the burner. The key advantage of this model in comparison to a model with general equilibrium assumed is that it was able to consider the rate of release of trace and minor species with time, the local equilibrium in the particles, and separately, that in the continuum phase (which also included any solid or liquid materials nucleating). The simulation generated the fate and occurrence profiles of each ash-forming element along the burner. The qualitative comparisons between the modeled profiles and the previous experimental findings under similar operating conditions show reasonable agreement. The concentrations of ash-forming elements released from the burner were also compared with the experimental online inductively coupled plasma readings. However, the latter comparison shows overestimation using the modeled results and might suggest that further considerations of other parameters such as ash nucleation and coagulation are required. Nonetheless, based on the ongoing performance of the integrated model, future use of the model might be expanded to a broader range of problematic solid fuels such as herbaceous biomass or municipal solid waste.

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Section: Resultsmentioning

confidence: 99%

Modeling and Evaluation of Ash-Forming Element Fate and Occurrence in Woody Biomass Combustion in an Entrained-Flow Burner

et al. 2022

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“…It has been observed that when excessive CO has been formed in the boiler for extended periods (disrupted boiler operational mode), disintegration of refractory castable with high iron oxide content (>4.4%) due to the general effect of CO and alkali occurred already after 8 months of operation ( Figure 6) [15]. Risks of refractories degradation due to CO can be reduced by using materials with as low amount of Fe 2 O 3 as possible (<1%).…”

Section: Resistance To the Impact Of Carbon Monoxide (Co)mentioning

confidence: 99%

“…Cracking (a) and degradation of aluminosilicate materials due to the formation of new compounds (carbon and leucite) in its structure (b)[15].…”

mentioning

confidence: 99%

Refractory Materials for Biofuel Boilers

Antonovič¹,

Szczerba²,

Kerienė³

et al. 2017

Frontiers in Bioenergy and Biofuels

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The energy equipment usable for solid biofuel incineration usually operates upon aggressive conditions. The internal structures (lining) of the equipment are made of refractory materials that are affected by combined loads: thermal, mechanical and chemical (i.e. high temperature-up to 1200°C, chemical impact of alkaline compounds and slag, repeating thermal shocks, abrasive effect caused by solid particles and so on). A majority of traditional refractories usable for lining in such equipment are not durable. Upon certain conditions of use (such as high local temperatures, influence of alkaline biofuel combustion products and so on), durability of the traditional materials is 1-2 years only. The opportunities of new refractory materials application should be set upon taking into account the conditions of operation for biofuel boilers of specific types. In this section-the data on the peculiarities of using refractory materials in biofuel boilers are reviewed, and the impact of aggressive operating conditions of such thermal equipment on the properties of refractory materials is discussed. In addition, the investigations results of refractory castables alkali resistance and its explosive spalling are discussed. The recommendations for use of refractory materials in biofuel boilers are also presented.

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“…Основной недостаток такого бетонаего низкие механические свойства после обжига при 800-1100 о С (например, предел прочности при сжатии < 20 МПа). Прочность традиционного жаростойкого бетона можно улучшить, модифицируя его состав ультрадисперсной добавкой микрокремнезема и дефлокулянта [1] [3,6]). Дополнительный негативный фактортермические напряжения в материале из-за частых остановок -пусков энергетических котлов для их очистки от золы и шлаков.…”

Section: Introductionunclassified

“…П. Зданявичус 1 , д. т. н. В. Антонович 1 , д. т. н. Р. Борис 1 , д. т. н. Р. Стонис 1 ( ) , д. т. н. Р. Шукис 2 , д. т. н. Е. Витек 3 1 Институт строительных материалов, Вильнюсский технический университет им. Гедиминаса…”

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The investigation of the modified refractory concrete in terms of the clay filler's kind

Zdаnyavichus¹,

Antonovich²,

Boris³

et al. 2018

Nov. ogneup.

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The properties of the conventional refractory concrete modified by means of the microsilica and the antiflocculant additions including the different kinds of the fire clay filler were investigated in the article. It was established that the refractory concrete with the filler Bos145 (about 44 % of Al2O3) had the smaller open porosity, and both high density and the ultimate compressive strength comparing to these characteristics which the concretes with the fillers Bos125 and Bos135 had (about 26 and 37 % of Al2O3respectively). Also it was found out that independently of the fire clay filler's kind another SiO2-based addition promoted the increase of the concrete's alkaline resistance by the factor of 5 and more. It was shown that this SiO2-based addition is effective at the temperatures up to 1100 °C, as at 1200 °C the chamotter concrete's porosity grew up and the resistance of the material against the alkaline melt decreased considerably.

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Action of the Products of Biofuel Combustion on the Phase Composition and Structure of Refractory Material

Cited by 7 publications

References 14 publications

Modeling and Evaluation of Ash-Forming Element Fate and Occurrence in Woody Biomass Combustion in an Entrained-Flow Burner

Modeling and Evaluation of Ash-Forming Element Fate and Occurrence in Woody Biomass Combustion in an Entrained-Flow Burner

Refractory Materials for Biofuel Boilers

The investigation of the modified refractory concrete in terms of the clay filler's kind

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