Characterization of microstructural evolution and mechanical properties of refractory composite

Boris, Renata; Kerienė, Jadvyga; Antonovič, Valentin; Madej, Dominika

doi:10.1016/j.compstruct.2015.08.059

Cited by 8 publications

(7 citation statements)

References 11 publications

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“…The risk of explosion of the structure is greatly increased, if the following types of castable are used: MCC, LCC and ULCC. To avoid explosive spalling of refractory castable due to the pressure of water vapours developed at the initial stage of heating, new produced linings of thermal equipment are dried and heated up for the first time in a very careful way [29]. But in the case of biofuel boilers, in practice, it is hardly technically possible to perform the procedure of castable drying accurately.…”

Section: Explosive Spalling Of Refractory Castablementioning

confidence: 99%

“…It has been found that the additive of polypropylene fibres (PPF) (Figure 13a) is well suited for decreasing the risk of explosive spalling of refractory castables [29]. A positive effect of this additive, with regard to its ability to decrease the risk of explosive spalling, is explained by the fact that PPF disintegrates at the temperature of 150-180°C, leading to the formation of microchannels (Figure 13b), allowing water vapours to pass through, and help to avoid a dangerous rise of pressure.…”

Section: Explosive Spalling Of Refractory Castablementioning

confidence: 99%

“…The testing of cylindrical MCC-type castable specimens, for their resistance to explosive spalling [29], has shown that the MCC-type specimen without of PPF additive explode at the temperature of 600°C under the conditions when temperature is raised to 1000°C at a rate of 40°C/min (Figure 14a). The specimen with PPF additive does not explode when the temperature is raised at the same range in heating up to 1000°C (Figure 14b).…”

Section: Explosive Spalling Of Refractory Castablementioning

confidence: 99%

“…The part of the combustion zone structure in the heating unit used in oil refineries damaged by explosive spalling (metal anchors can be seen on the photograph)[29].…”

mentioning

confidence: 99%

“…SEM micrographs of the PPF (a) and the micro-structure of refractory material with burned PPF after heating at 170°C (b)[29].…”

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confidence: 99%

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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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Section: Explosive Spalling Of Refractory Castablementioning

confidence: 99%

Section: Explosive Spalling Of Refractory Castablementioning

confidence: 99%

Section: Explosive Spalling Of Refractory Castablementioning

confidence: 99%

“…The part of the combustion zone structure in the heating unit used in oil refineries damaged by explosive spalling (metal anchors can be seen on the photograph)[29].…”

mentioning

confidence: 99%

“…SEM micrographs of the PPF (a) and the micro-structure of refractory material with burned PPF after heating at 170°C (b)[29].…”

mentioning

confidence: 99%

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