Linguistics

Engineering

Philosophy

Reducing atmosphere

Metallurgy

Materials science

Mineralogy

Albite

Slag (welding)

Anorthite

Nepheline

Fouling

Biochemistry

Chemical engineering

Geology

Oxidizing agent

Organic chemistry

Membrane

Quartz

Petroleum

Environmental science

Fly ash

Petroleum coke

Composite material

Chemistry

Composition (language)

Chemical composition

Coke

Energy & Fuels

Petroleum coke (petcoke) ash fusibility is closely related to the ash-related fouling and slagging, which have significant effects on its clean and efficient utilization. Sodium (Na) element in petcoke ash is considered to induce ash fouling and slagging. In this paper, we investigate the effect of Na2O on the petcoke ash fusibility from the perspectives of atmosphere, Na2O content, and temperature. The crystalline minerals and surface morphologies of high-temperature ashes were determined by X-ray diffraction and scanning electronic microscopy, respectively. Thermodynamic software FactSage was applied to calculate the ash melting process. The results show that the ash fusion temperature (AFT) of petcoke ash exhibits a continuous decline with the addition of Na2O at both oxidizing and reducing atmospheres, which is ascribed to the mineral transformation behaviors of high-temperature ashes. Under oxidizing atmosphere, the low-melting Na-bearing albite (NaAlSi3O8) formed at high-temperature ash with the addition of Na2O decreases the AFT, and the decomposition of high-melting anorthite (CaAl2Si2O8) and quartz (SiO2) further leads to the decline of AFT. Under reducing atmosphere, another low-melting Na-bearing nepheline (NaAlSiO4) is found in high-temperature ash. Moreover, mullite and anorthite disappear with increasing Na2O content, which can both contribute to the progressive decline of AFT. The high-temperature ash samples with high Na2O content have a higher melting extent at oxidizing and reducing atmospheres. These ash particles present a more smooth surface and a denser layer structure.

Effect of Na<sub>2</sub>O in Ash Composition on Petroleum Coke Ash Fusibility

Effect of Na2O in Ash Composition on Petroleum Coke Ash Fusibility

Effect of Na₂O in Ash Composition on Petroleum Coke Ash Fusibility