Characterization of Some Nigerian Coals for Power Generation

Chukwu, M.; Folayan, C. O.; Pam, G. Y.; Obada, David O.

doi:10.1155/2016/9728278

Cited by 40 publications

(46 citation statements)

References 3 publications

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“…However, the HHV estimated for the oxy‐cracked by Equation (1) is rather higher than the expected 37 MJ/kg, as this correlation is only a function of VM, indicating that the use of this equation is not valid for the petcoke. Importantly, the difference between the HHV of oxy‐cracked petcoke obtained by the ultimate analysis and the ones obtained by the proximate analysis is attributed to dependence of ultimate correlations on the chemical composition of fuels especially the high promotion of oxygen compounds, which tie up some of carbon and hydrogen in the form of CO, H 2 O, and phenol . This fact also explains the reduction in HHV of oxy‐cracked petcoke compared with virgin petcoke.…”

Section: Resultssupporting

confidence: 62%

“…Even though the HHV of petcoke is relatively higher than the oxy‐cracked sample, the nitrogen and sulphur content in the oxy‐cracked sample is much lower, and thus caused low atmospheric gaseous emissions. Interestingly, the HHVs of the oxy‐cracked products were found to be higher than that for the ranked‐coals (9.50–27 MJ/kg), as previously reported . Therefore, the use of oxy‐cracked products as a fuel appears probable for power generation, by co‐firing, pyrolysis, or gasification into energy.…”

Section: Resultssupporting

confidence: 62%

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Enhancement of petroleum coke thermal reactivity using Oxy‐cracking technique

2019

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Petroleum coke (petcoke) is a challenging fuel in terms of its complexity, high sulphur and nitrogen content, low volatile content, and undesirable emissions of SOx and NOx when used for power generation. To overcome these challenges, the oxy‐cracking process was recently proposed to convert the petcoke into a clean combustion fuel by reducing its sulphur and nitrogen contents, and consequently increasing its reactivity and combustibility. This work aimed to study the heating values and thermo‐oxidative behaviour of the oxy‐cracked petcoke, virgin petcoke, and their blends using thermogravimetric analysis (TGA). The results showed that the oxy‐cracked petcoke is oxidized at a temperature of 475 °C, which is easier and faster than the virgin petcoke, which is usually oxidized at around 540 °C. The heating value of the oxy‐cracked petcoke was not impacted and maintained constant ~30 MJ/kg, which is relatively similar to the virgin petcoke. The nitrogen and sulphur content in the oxy‐cracked petcoke is much lower than that of virgin petcoke. A significant improvement in the combustion performance parameters of the oxy‐cracked petcoke and their blends with virgin petcoke was achieved. For instance, the ignition temperature of the proposed fuel is reduced to 13 % compared to the virgin petcoke, which led to increasing the ignition index by two‐folds. Therefore, this approach might help in improving the thermal efficiency of petcoke by using oxy‐cracked products as an initiator in the combustion process.

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Section: Resultssupporting

confidence: 62%

Section: Resultssupporting

confidence: 62%

Enhancement of petroleum coke thermal reactivity using Oxy‐cracking technique

2019

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“…The particle sizes of the raw materials and the uniform formulation favors attrition and a high degree of conditioning due to its ability to absorb moisture. Samples [31], showing that tannery-derived briquettes can compete favorably with coal as an energy source. Manufacturing conditions such as temperature and pressure also influences calorific value [32,33].…”

Section: Calorific Valuementioning

confidence: 99%

Production and Characterization of Biomass Briquettes from Tannery Solid Waste

et al. 2017

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Abstract:The tannery industry is renowned for the huge amount of toxic solid and liquid waste generated from the cleaning, fleshing, splitting, tanning, shaving and buffing of raw materials. Biomass briquettes are a proven way of generating energy from waste. This study investigates the development and characterization of biomass briquettes from tannery solid wastes (TSWs). TSWs, which comprise hair, flesh, chrome shavings and buffing dust, were collected from a tannery in Kano, Nigeria, to formulate and characterize six briquettes. Scanning electron microscopy and proximate analysis were carried out on the samples. The six briquettes, comprising varying ratios of hair, flesh, chrome shavings and buffing dust, were molded and characterized. Thermal efficiency, durability and compressive strength, among other properties, were determined for the six briquette formulations. The briquettes developed had calorific values between 18.632 and 24.101 MJ/kg. Durability of the briquettes ranged from 98.12% to 99.77%. The energy values were within the range of 17.462-24.101 MJ/kg, which was comparable to other fuel sources such as sub-bituminous coal (20.000-24.730 MJ/kg). This study shows that TSWs can be used for fuel briquette production, which is a source of sustainable energy generation. It is environmentally friendly, cost effective and affordable compared to fossil fuel.

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“…This phenomenon suggests that another exothermic reaction comes into action at this stage. The variations of the TG and DSC curves for the sample heated in the aerial atmosphere are essentially related to the multiple reactions that occur during the oxidation process (Chukwu et al, 2016).…”

Section: Combustion Characteristicsmentioning

confidence: 99%

Study on combustion characteristics of coal-biomass for co-firing system as a feedstock of coal gasification process

Umar

Hudaya

Sulistyohadi

2017

IMJ

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Biomass co-firing is recognised as a crucial technology to aid in the use of fossil fuels, particularly due to its relative ease of implementation. Many studies of the combustion processes associated with cofiring have been conducted elsewhere. This paper discusses the combustion characteristics of coal and torrefied biomasses. Combustion profiles can be used to study certain combustion properties of fuels and fuel blends. The biomass fuels utilized in this study include twig, trunk and weed as the wastes from tea plantation. The results of this work provide data concerning the combustion processes of co-firing determined by simultaneous thermal analysis (STA) methods. Simultaneous thermogravimetric & differential scanning calorimetry/differential thermal analysis (STA, TGA-DSC/DTA) measures both the heat flow (DSC) and the weight changes (TG) in a material as a function of temperature or time in a controlled atmosphere. The results indicate that the mixture of coal and torrefied trunk in the weight ratio of coal-trunk of 25:75 shows the best combustion performance compared to other compositions of coal -torrefied biomass.Keywords: coal, biomass, co-firing, torrefaction, combustion Kata kunci: batubara, biomasa, pembakaran bersama, pengarangan, pembakaran. ABSTRAK Sistem pembakaran bersama (co-firing) diakui sebagai teknologi yang dapat membantu dalam membatasi penggunaan bahan bakar fosil, terutama karena mudah untuk diimplementasikan. Beberapa studi tentang proses pembakaran terkait dengan pembakaran bersama ini telah banyak dilakukan. Makalah ini membahas karakteristik pembakaran batubara dan biomasa yang telah mengalami proses pengarangan (torrefaction). Profil pembakaran dapat digunakan untuk mempelajari

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Characterization of Some Nigerian Coals for Power Generation

Cited by 40 publications

References 3 publications

Enhancement of petroleum coke thermal reactivity using Oxy‐cracking technique

Enhancement of petroleum coke thermal reactivity using Oxy‐cracking technique

Production and Characterization of Biomass Briquettes from Tannery Solid Waste

Study on combustion characteristics of coal-biomass for co-firing system as a feedstock of coal gasification process

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