Densification of coal fines and mildly torrefied biomass into composite fuel using different organic binders

Adeleke, A.A. and Odusote, J.K. and Lasode, O. A. and Ikubanni, P.P. and Malathi, M. and Paswan, D. (2019) Densification of coal fines and mildly torrefied biomass into composite fuel using different organic binders. Heliyon, 5. ISSN 2405-8440

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Coal processing industries generate millions of tons offines (<3 mm) during mining operation and are oftenconsidered as wastes. These wastes have enormous potential in serving as energy and metallurgical operationfeedstock. One avenue for its use is densification into briquettes or pelletizes. Various briquetting techniques havebeen adopted in the past few decades; however, the main issues upfront in commercializing these techniques aresignificant binder cost and poor mechanical integrity. Therefore, the present study concentrates on utilizingcommonly available organic binder along with pretreated biomass in developing coalfine briquettes. Briquetteswere produced after initial pretreatment of the raw materials under a load of 2 tons. Briquettes were cured in aninert environment and eventually characterized for its main litmus requirements (physical properties). It wasobserved that pitch-molasses bonded briquettes have better physical properties leading to good mechanicalintegrity than briquettes produced from individual binder. The proximate, ultimate and calorific value analyses ofthe briquettes do not deteriorate but mildly improved compared to the raw coalfines. With a density of 1.18–1.32g/cm3, drop to fracture that is greater than 100 (times/2 m), impact resistance index well above 6000, waterresistance index of 99% and cold crushing strength of 9 MPa, pitch-molasses bonded briquettes clearly surpassedrecommended physical properties benchmarked for briquettes of industrial and domestic end use. The physicalproperties of the briquettes favorably meet requirements as feedstock for rotary kiln direct reduced iron andCOREX iron-making processes as well as fuel for thermal operations

Item Type: Article
Subjects: T Technology > TJ Mechanical engineering and machinery
Date Deposited: 23 Sep 2019 14:12
Last Modified: 23 Sep 2019 14:12

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