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Petrology, physicochemical and thermal analyses of selected cretaceous coals from the Benue Trough Basin in Nigeria

International Journal of coal Science & Technology 2020年第1期7卷 26-42页

作者： S.A.Akinyemi O.F.Adebayo B.B.Nyakuma A.K.Adegoke O.A.Aturamu O.A.OlaOlorun A.Adetunji J.C.Hower M.M.Hood A.Jauro Department of Geology Ekiti State University.P.M.B 5363Ado EkitiEkiti StateNigeria School of Chemical and Energy Engineering Universiti Teknologi MalaysiaSkudaiMalaysia Department of Geology Obafemi Awolowo UniversityP.M.BOB.lie IfeOsun StateNigeria Centre for Applied Energy Research University of KentuckyKentuckyUSA National Centre for Petroleum Research and Development(NCPRD) Abubakar Tafawa Balewa UniversityBauchiNigeria

Abundant coal resources that were previously neglected due to a crude oil boom need revitalisation and integration into the national electricity mix to address the energy demands of the Nigerian *** coal samples from the Benue Trough sedimentary basin in Nigeria were examined by various techniques,including proximate and ultimate analyses,organic petrography,Fourier transform infrared ray spectroscopy,and thermogravimetric *** on vitrinite reflectance,the Lafia-Obi(OLB),Garin Maiganga(GMG),Imiegba(IMG),and Okaba(OKB)coals are classified as subbituminous,while the Lamja1(LMJ1),Lamja2(LMJ2)and Chikila(CHK)coals are high volatile B *** Enugu(ENG)coal is on the boundary between subbituminous and high volatile C *** petrographic results indicate vitrinite and fusinite contents steadily increase from the Lower Benue Trough coals to the Upper Benue Trough coals,while semifusinite and total mineral contents follow a reverse *** decomposition occurred in three stages,i.e.,drying,devolatilization,and coke formation above 700°C;and the coal reactivity follows the following order,ENG>IMG>IGH>CHK>LMJ>OKB>GMG>*** higher temperatures(above 900°C)are required to decompose the coals for efficient energy *** LMJ1,LMJ2,OLB,CHK,GMG,and OKB coals can be exploited for electricity power ***,the Imeagha and Enugu coals are best suitable for both cement and power generation.

关键词： Petrology Thermal analysis cretaceous coal Benue Trough Nigeria

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Mineralogy,physicochemical and oxidative thermal analyses of cretaceous coals from the Benue Trough,Nigeria

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Energy Geoscience 2021年第2期2卷 129-135页

作者： Segun A.Akinyemi Bemgba B.Nyakuma Aliyu Jauro Olajide F.Adebayo Olusola A.OlaOlorun Adebanji K.Adegoke Adeyinka O.Aturamu Ademuyiwa Adetunji Wilson M.Gitari Rabelani Mudzielwana Department of Geology Faculty of ScienceEkiti State UniversityP.M.B 5363Ado EkitiEkiti StateNigeria School of Chemical and Energy Engineering Faculty of EngineeringUniversiti Teknologi Malaysia81310SkudaiJohor BahruMalaysia National Centre for Petroleum Research and Development AbubakarTafawa Balewa UniversityP.M.B 0248BauchiBauchi StateNigeria Department of Geology Obafemi Awolowo UniversityP.M.B 13Ile-IfeOsun StateNigeria Department of Ecology and Resources Management University of VendaPrivate Bag X5050Thohoyandou0950LimpopoSouth Africa

The erratic supply of electricity in Nigeria has renewed interest in the utilisation of coal for energy selfsufficiency and diversification of the national energy *** this study,selected coal samples from three regions of the Benue Trough Basin were examined through pore water chemistry,X-ray diffraction(XRD),and thermosgravimetric analysis(TGA).The low pH observed for the Lower Benue Trough(LBT)coals indicates the release of sulphur and acids during *** analyses reveal quartz,kaolinite,montmorillonite,albite,pyrite,gypsum and sodium chlorate in the coal *** genetic kaolinite species identified in Imeagha(IMG)coal are detrital kaolinite and the highly crystalline neomorphic *** and jarosite minerals occurred in minor quantities in Garin Maiganga(GMG),whereas significant amount of pyrite was detected in Enugu(ENG)*** thermal degradation resulted in the residual mass(RM)ranging between 4.35%and 56.96%and mass losses(ML)between 43.04%and 95.65%due to the drying,devolatilization,and coke formation in the *** most reactive coal examined was GMG coal,whereas the least reactive was IMG ***(LMZ),GMG,and OKB coals are suited for electricity generation,whereas ENG and IMG coals can be utilised for cement production.

关键词： Benue trough cretaceous coal Mineralogy Physicochemical analysis Thermogravimetry

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