Combustion kinetics of Shankodi-Jangwa coal

• Main Authors: Nyakuma, B. B., Jauro, A., Oladokun, O., Abdullah, T. A. T., Uthman, H.
• Format: Article
• Language: English
• Published: Penerbit Universiti Sains Malaysia 2016
• Subjects: QD Chemistry
• Online Access: http://eprints.utm.my/id/eprint/71720/1/BemgbaBevanNyakuma2016_CombustionKineticsofShankodiJangwaCoal.pdf; http://eprints.utm.my/id/eprint/71720/; https://www.scopus.com/inward/record.uri?eid=2-s2.0-85002796605&doi=10.21315%2fjps2016.27.3.1&partnerID=40&md5=80e614b9f2772b7c527452eacab50dd7

The lack of comprehensive data on the fuel properties of newly discovered coal deposits in Nigeria has hampered the prospective utilisation for power generation. Consequently, this study is aimed at characterising the physicochemical and thermokinetic properties of Shankodi-Jangwa (SKJ) coal recently discovered in Nassarawa state, Nigeria. The results indicate that SKJ comprises 40.50% fixed carbon, 43.34% volatile matter, and 2.36% sulphur with a higher heating value (HHV) of 27.37 MJ kg-1. Based on this HHV, SKJ was classified as high-volatile B bituminous coal. Thermal analysis of SKJ under oxidative thermogravimetry (TG) at multiple heating rates revealed that SKJ is highly reactive and thermally degradable below 1000°C. Kinetic analysis using the Flynn-Wall-Ozawa model for conversions α = 0.05-0.90 revealed the activation energy to range from Ea = 113-259 kJ mol-1, with the frequency factor ranging from A = 2.9 × 1013-1.5 × 1023 min-1 and a range in R2 = 0.8536-0.9997; the average values of these ranges are Ea = 184 kJ mol-1, A = 9.2 × 1023 min-1 and R2 = 0.9420, respectively. The study highlighted fuel property data vital for modelling and designing future SKJ coal power generation.