Carbonization and Coke Characteristics of Ogboligbo Coal

Nyakuma, Bemgba Bevan; Oladokun, Olagoke; Abdullah, Tuan Amran Tuan; Ojoko, Edo Oga; Abdullahi, Mujahid; El-Nafaty, Abbas Sa’id; Ahmed, Alaa H.

doi:10.3103/s1068364x18110066

Cited by 2 publications

(1 citation statement)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this study, the moisture content of below 10% observed for all the coal samples are within the acceptable limits for electric power generation (Chukwu et al 2016) or thermochemical conversion into value-added products (Akinyemi et al 2020a). In contrast, the volatile matter (VM) is an important factor for determining not only the coal rank (Speight 2012) but also its suitability for potential energy recovery through pyrolysis (carbonisation), combustion or gasification (Nyakuma et al 2018).…”

Section: Kinetic Analysesmentioning

confidence: 64%

Physicochemical, mineralogy, and thermo-kinetic characterisation of newly discovered Nigerian coals under pyrolysis and combustion conditions

Nyakuma

Jauro

Akinyemi

et al. 2021

Int J Coal Sci Technol

View full text Add to dashboard Cite

In this study, the physicochemical, microstructural, mineralogical, thermal, and kinetic properties of three newly discovered coals from Akunza (AKZ), Ome (OME), and Shiga (SHG) in Nigeria were examined for potential energy recovery. Physicochemical analysis revealed high combustible but low levels of polluting elements. The higher heating values ranged from 18.65 MJ/kg (AKZ) to 26.59 MJ/kg (SHG). Microstructure and mineralogical analyses revealed particles with a rough texture, surface, and glassy lustre, which could be ascribed to metals, quartz, and kaolinite minerals. The major elements (C, O, Si, and Al), along with minor elements (Ca, Cu, Fe, K, Mg, S, and Ti) detected are associated with clays, salts, or the porphyrin constituents of coal. Thermal analysis showed mass loss (ML) ranges from 30.51% to 87.57% and residual mass (RM) from 12.44% to 69.49% under combustion (oxidative) and pyrolysis (non-oxidative) TGA conditions due to thermal degradation of organic matter and macerals (vitrinite, inertinite and liptinite). Kinetic analysis revealed the coals are highly reactive under the oxidative and non-oxidative conditions based on the Coats–Redfern Model. The activation energy (Ea) ranged from 23.81 to 89.56 kJ/mol, whereas the pre-exponential factor (ko) was from 6.77 × 10–4/min to 1.72 × 103/min under pyrolysis and combustion conditions. In conclusion, the coals are practical feedstocks for either energy recovery or industrial applications.

show abstract

Section: Kinetic Analysesmentioning

confidence: 64%