Effect of Slag Impregnation on Thermal Degradations in Refractories

Blond, Éric; Schmitt, Nicolas; Hild, François; Blumenfeld, Philippe; Poirier, Jacques

doi:10.1111/j.1551-2916.2006.01348.x

Cited by 38 publications

(22 citation statements)

References 12 publications

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“…Practical testing of a wide variety of materials under the same testing protocol showed that the microstructure, chemistry, and intrinsic properties of each individual refractory had, as expected, a significant effect on the thermal shock resistance . Further complicating the mechanical failure of ceramics and refractories in service was the interaction of the refractory with the environment, which was found to significantly change the refractory degradation processes . The infiltration of a liquid phase into the open pores of a refractory material, commonly seen during the use of refractories in metallurgy, had a large negative effect on the thermal cycle resistance …”

Section: Common Failure Modes Of Precast Monolithicsmentioning

confidence: 65%

Engineering resilience with precast monolithic refractory articles

Goski¹,

Lambert²

2019

Int J Ceramic Engine & Sci

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Precast refractory ceramic shapes have had well-known benefits over other refractory lining methods: consistent and controlled manufacturing processes with faster turnaround than traditional cast-in-place monolithic refractories, reduced labor cost over classic brick installations, and, if well designed, simple repair assemblies. By analyzing the common failure modes of precast monolithic shapes, a distinct method to enhance these advantages was theorized. Through modeling and in-field testing, the use of multicomponent and heterogeneous composite refractory systems incorporating high-temperature reinforcement structures increased reliability and provided more predictable modes of failure. K E Y W O R D Scastables, mechanical properties, refractories, stress, thermal shock/thermal shock resistance 170 | GOSKI and LaMBERT 2 | COMMON FAILURE MODES OF PRECAST MONOLITHICSThe same modes of failure would be found in precast monolithic shapes as most other refractory materials used in industrial applications. While failure modes vary widely, two of the most prevalent causes for end of service have been found to be corrosion and/or mechanical failure.How to cite this article: Goski D, Lambert M. Engineering resilience with precast monolithic refractory articles. Int J Ceramic Eng Sci. 2019;1: 169-177. https ://doi.

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Section: Common Failure Modes Of Precast Monolithicsmentioning

confidence: 65%

Engineering resilience with precast monolithic refractory articles

Goski¹,

Lambert²

2019

Int J Ceramic Engine & Sci

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show abstract

“…Once the REV has been defined it is essential to well identify the state variables to describe the behaviour of the system. As it is not so obvious to do it when dealing with multi-physical problems, the use of a coupling scheme is recommended [9]. This approach simplifies drawing of the physics in presence and their interactions and permits to not forget a coupling effect.…”

Section: Essential Basic Concept Of Thermodynamics and Macroscopic Momentioning

confidence: 99%

Multiphysics Modelling Applied to Refractory Behaviour in Severe Environments

Blond

Merouki

Schmitt

et al. 2014

Advances in Science and Technology

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It is a common practice to design refractory linings with the help of thermal computations, thermochemistry analyses and strong workman know-how. Their mechanical design is often limited to simple thermo-elastic computations. Sometimes computations are refined considering non-linear mechanical behaviour, even if corrosion often induces additional chemical strain and strong change in service of the mechanical behaviour of the refractory. The aim of this presentation is to briefly recast the irreversible thermodynamic framework in order to underline the implications of some basic thermodynamic concepts in term of refractory behaviour modelling. Then, the use of these concepts to develop fully 3D finite element simulations accounting simultaneously for thermal, mechanical and chemistry phenomena will be illustrated on the particular case of SiC-based refractory. Comparison between long duration oxidation test at high temperature and model prediction allows the validation of the proposed approach. Then, an extension to the industrial case of refractory lining in Waste to Energy plant will be illustrated. The interest of taking into account the thermo-chemo-mechanical coupling effects is shown.Nowadays, development of finite elements analysis (FEA) and of thermochemistry software [4] permits to foresee lining simulations taking into account both thermo-mechanics analysis (i.e. structural effects in sense of geometry and mechanical behaviour) and thermo-chemistry analysis (in

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“…Factors that control the penetration of molten slag into the refractory include the operating atmosphere, refractory temperature, refractory porosity, pore size distribution, slag composition, and interfacial surface properties of the slag with respect to microstructure and chemistry of the refrac-tory material. 4 To complement the authors' prior work on the effects of temperature gradients on slag penetration, 5 this analysis examines the role of time and oxygen partial pressure in the interactions between synthetic coal slag and Al 2 O 3 refractory materials. While refractories with high Cr 2 O 3 content are considered to be the material of choice in industrial gasifiers, 6 this study focuses on a 99 at.% Al 2 O 3 refractory so as to simplify the degradation analysis to a single chemical system.…”

Section: Introductionmentioning

confidence: 99%

“…10(a)'s Micrograph of a Porous Area near the Top Interface of 5 h Infiltration in Air Atmosphere. Regions Belonging to (3) Contain Higher Concentrations of Fe 2 O 3 Than the Unaffected Al 2 O 3Regions Belong to(4)…”

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confidence: 99%

Influence of Oxygen Partial Pressure on Synthetic Coal Slag Infiltration into Porous Al₂O₃ Refractory

et al. 2012

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The infiltration characteristics of synthetic coal slag into Al2s3 refractory material with a temperature gradient induced along the slag's penetration direction were investigated with respect to time and oxygen partial pressure of the experimental atmosphere. Synthetic slag, which is representative of an average of the ash contents from United States coal feedstock, was melted in either an oxidizing air atmosphere or a reducing CO/CO2 gas mixture with a ratio of 1.8. The experiments were conducted with a hot‐face temperature of 1450°C, and the slags were deposited onto refractory samples in the same atmospheres as they were originally melted. A comparison between the infiltrations in the CO/CO2 and air atmospheres revealed that differences in oxygen partial pressure changed the mode in which the slag interacted with the refractory. While infiltrations in CO/CO2 atmosphere demonstrated elevated Al2O3 concentrations in the slag owing to refractory dissolution, infiltrations in air atmosphere showed enrichment of SiO2 and Al2O3 in the slag because iron‐oxide from the slag incorporated into the corundum refractory. For both cases, the reactions led to increases in viscosity, but the effect was more profound in the air atmosphere, where penetrations were found to be shallower. The oxygen partial pressure's influence on the slag's composition, primarily with iron‐oxide species, and on viscosity played a pivotal role in governing the effective penetration into the refractory.

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Effect of Slag Impregnation on Thermal Degradations in Refractories

Cited by 38 publications

References 12 publications

Engineering resilience with precast monolithic refractory articles

Engineering resilience with precast monolithic refractory articles

Multiphysics Modelling Applied to Refractory Behaviour in Severe Environments

Influence of Oxygen Partial Pressure on Synthetic Coal Slag Infiltration into Porous Al₂O₃ Refractory

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Effect of Slag Impregnation on Thermal Degradations in Refractories

Cited by 38 publications

References 12 publications

Engineering resilience with precast monolithic refractory articles

Engineering resilience with precast monolithic refractory articles

Multiphysics Modelling Applied to Refractory Behaviour in Severe Environments

Influence of Oxygen Partial Pressure on Synthetic Coal Slag Infiltration into Porous Al2O3 Refractory

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Product

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Influence of Oxygen Partial Pressure on Synthetic Coal Slag Infiltration into Porous Al₂O₃ Refractory