Study of Alkali Resistance of Refractory Materials Used in Boilers Operating on Wood Fuel

Boris, Renata; Antonovič, Valentin; Kerienė, Jadvyga; Stonys, Rimvydas; Kudžma, Andrius; Zdanevičius, Povilas

doi:10.1007/s11148-017-0039-6

Cited by 5 publications

(2 citation statements)

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“…The corrosion of metals and refractories by alkaline vapor is a severe problem in the kiln. 7,8) In addition, when biomass fuels, which utilize renewable energy sources, are burned in various furnaces, corrosion vapor is formed due to the fuel alkalinity, 9,10) which attacks refractories in the furnace. Recently, ceramics containing Na and/or K have been widely studied as lead-free electronic ceramics for environmental protection, and there are major concerns about the effects of alkaline vapors on refractories in the furnace.…”

Section: Introductionmentioning

confidence: 99%

Corrosion of Polycrystalline Wool by Na2CO3 Vapor

Naeshirozako¹,

Takeuchi

Sugiyama³

et al. 2021

Mater. Trans.

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The corrosion behavior of six types of polycrystalline wool blanket samples, which were composed of alumina and silica, and exposed to Na 2 CO 3 vapor at 1350°C for 24 h, was investigated. The corrosion in sample A100 (Al 2 O 3 : 99.6 mass%) by alkaline vapor was suppressed remarkably as the corundum phase changed to the ¢-alumina (Na 2 O•11Al 2 O 3 ) phase only at the surface of the fiber, and the surface layer functioned as a protective layer against corrosion. The corundum phase in sample A95 (Al 2 O 3 : 94.9 mass%) changed slightly to ¢-alumina due to the formation of the carnegieite phase via the decomposition of mullite phase corroded by alkaline vapor. The corrosion in samples A80 (Al 2 O 3 : 80.280.8 mass%) and A72 (Al 2 O 3 : 72.273.2 mass%) by alkaline vapor was more intense than that in samples A100 and A95 because of the high silica content. Alkaline vapor remained near the reaction surface and reacted locally with fibers in a narrow region because the area of the amorphous phase in the high-density samples (A80-H and A72-H) was wider than that in the low-density samples (A80-L and A72-L), and the permeability of the vapor was low in the high-density samples. The carnegieite phase, which was present in the temperature range of 1000 1300°C, disappeared and the amorphous phase was simultaneously formed during alkaline vapor exposure at 1350°C for 8 h in the corrosion process of A72-H.

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Section: Introductionmentioning

confidence: 99%

Corrosion of Polycrystalline Wool by Na2CO3 Vapor

Naeshirozako¹,

Takeuchi

Sugiyama³

et al. 2021

Mater. Trans.

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“…There are many studies concerning the performance of refractories used in the steelmaking process [ 16 , 17 , 18 , 19 ], but the thermodynamic research on sodium salt corrosion of refractory materials is limited. D. Gregurek et al [ 20 ] used Factsage software to carry out thermodynamic simulation on the corrosion of refractory lining caused by slag and CuO.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Prediction of Corrosion of Refractory Materials by Sodium Salts during Waste Liquid Incineration—Thermodynamic Study

et al. 2020

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Incineration of high-content sodium salt organic waste liquid will corrode the refractory material in the incinerator, causing the refractory material to peel off and be damaged. A thermodynamics method was used to study the thermodynamic properties of three common sodium salts (NaCl, Na2CO3 and Na2SO4) on the corrosion of refractory materials (MgO·Cr2O3, MgO·Al2O3, Al2O3, MgO and Cr2O3). The results determined that MgO has the best corrosion resistance and is not corroded by the three sodium salts. On this basis, the thermodynamic corrosion experiments of NaCl corrosion of magnesium oxide at three temperatures of 600, 1000 and 1200 °C were carried out. Analysis of the corrosion product by X-ray diffraction (XRD) showed no corrosion product formation. Studies have shown that thermodynamic calculation can accurately predict the thermodynamic mechanism of alkali metal corrosion to refractory materials, and MgO is a good anti-alkali metal corrosion refractory material.

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