Search Results - "Bunt, J.R."

Influence of added potassium and sodium carbonates on CO2 reactivity of the char from a demineralized inertinite rich bituminous coal by Klopper, L., Strydom, C.A., Bunt, J.R.

“…► The paper describes the influence of potassium and sodium carbonates on the CO2 (gasification processes) reactivity of an inertinite rich South African coal…”
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Changes to the organic functional groups of an inertinite rich medium rank bituminous coal during acid treatment processes by Strydom, C.A., Bunt, J.R., Schobert, H.H., Raghoo, M.

“…A South African inertinite rich medium rank bituminous coal was subjected to a series of acid treatment steps using concentrations of HF and HNO 3 ranging…”
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Structural analysis and gasification reactivity of chars derived from the slow pyrolysis of extruded coal fines and recycled plastic by Marais, C., Bunt, J.R., Leokaoke, N.T., Neomagus, H.W.J.P., Okolo, G.N., Wagner, N.J., Meyer, J.A.

“…The evolution of char resulting from the co-pyrolysis of recycled plastic and discard fine coal, along with the impact of varying plastic additions on the…”
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Comparison of industrial wastes as a binder in the agglomeration of coal fines by Uwaoma, Romanus Chinonso, Henning, C.N., Bunt, J.R., Leokaoke, N.T., Neomagus, H.W.J.P.

“…There is limited work reported in the literature on the use of waste material as a coal binder, and no study has reported the use of industrial petroleum waste…”
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Steam gasification kinetics of biochar at elevated pressures by Schroeder, J., Neomagus, H.W.J.P., Bunt, J.R., Everson, R.C., Uwaoma, R.C.

“…A waste product biomass sample was received and charred to produce the biochar sample. The char reactivity experiments were conducted in a high-pressure fixed…”
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Extraction of alumina from coal fly ash generated from a selected low rank bituminous South African coal by Matjie, R.H., Bunt, J.R., van Heerden, J.H.P.

“…Vast quantities of coal ash, originating from the steam generation coal-based process have accumulated over the years. Continuous research is conducted to…”
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The petrographic determination of reactivity differences of two South African inertinite-rich lump coals by Malumbazo, N., Wagner, N.J., Bunt, J.R.

“…► Two Highveld coals (Coals A and B) were assessed for their conversion performance. ► Coal petrography was utilized as the assessment tool on this study. ►…”
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Behaviour of selected major elements during fixed-bed gasification of South African bituminous coal by Bunt, J.R., Waanders, F.B., Schobert, H.

“…► We model the mineral transformation in a moving bed gasifier. ► We dissect the contents of a quenched commercial-scale gasifier to validate the model. ► XRD…”
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Structural analysis of chars generated from South African inertinite coals in a pipe-reactor combustion unit by Malumbazo, N., Wagner, N.J., Bunt, J.R., Van Niekerk, D., Assumption, H.

“…An inertinite-rich medium rank C bituminous South African coal was utilized to generate chars in a pipe-reactor combustion unit. This unit generates chars at…”
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Volatile trace element behaviour in the Sasol ® fixed-bed dry-bottom (FBDB)™ gasifier treating coals of different rank by Bunt, J.R., Waanders, F.B.

“…Trace element simulation and validation of model predictions for the elements Hg, As, Se, Cd and Pb have recently been undertaken for the Sasol ® FBDB™…”
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The impact of particle size and maceral segregation on char formation in a packed bed combustion unit by Malumbazo, N., Wagner, N.J., Bunt, J.R.

“…•The impact of coal particle size reduction was successfully assessed by petrography.•Maceral distribution of the feed coal fractions varied from the ROM…”
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The properties of large coal particles and reaction kinetics of corresponding chars by Everson, R.C., Neomagus, H.W.J.P., van der Merwe, G.W., Koekemoer, A., Bunt, J.R.

“…•The chemical, petrographic and physical properties of coal particles of different sizes and densities were determined.•The distribution of properties depended…”
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Pipe reactor gasification studies of a south african bituminous coal blend. Part 1 – Carbon and volatile matter behaviour as function of feed coal particle size reduction by Bunt, J.R., Waanders, F.B.

“…The Sasol-Lurgi fixed-bed dry-bottom (FBDB) MKIV gasifiers are proven to be robust as far as acceptable coal properties are concerned, in particular its…”
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Physical property behaviour of North Dakota lignite in an oxygen/steam blown moving bed gasifier by Mangena, S.J., Bunt, J.R., Waanders, F.B.

“…In this study lignite originating from North Dakota (USA) was thermally treated in an oxygen/steam blown commercial-scale moving bed gasifier operating on lump…”
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Identification of the reaction zones occurring in a commercial-scale Sasol–Lurgi FBDB gasifier by Bunt, J.R., Waanders, F.B.

“…Gasification behaviour is particle dependent, whilst gasifier (reactor) behaviour is an averaging process of individual responses of each particle. It was…”
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An understanding of lump coal physical property behaviour (density and particle size effects) impacting on a commercial-scale Sasol-Lurgi FBDB gasifier by Bunt, J.R., Waanders, F.B.

“…Thermal processes which utilize coarse coal, such as fixed-bed gasification and chain grate stoker boilers, are dependant on a stable particle size for stable…”
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An understanding of the porosity of residual coal/char/ash samples from an air-blown packed bed reactor operating on inertinite-rich lump coal by Bunt, J.R., Waanders, F.B., Nel, A., Dreyer, L., van Rensburg, P.W.A.

“…► We study the porosity behaviour of lump inertinite-rich coal in an air-blown packed-bed reactor. ► Micro-pore surface area and pore diameter increase during…”
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Mineralogical behaviour of North Dakota lignite in an oxygen/steam blown moving bed reactor by Mangena, S.J., Bunt, J.R., Waanders, F.B.

“…In this study, lignite from North Dakota (USA) was thermally treated in a commercial-scale oxygen/steam blown moving bed reactor at the Dakota Gasification…”
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Carbon particle type characterization of the carbon behaviour impacting on a commercial-scale Sasol-Lurgi FBDB gasifier by Bunt, J.R., Wagner, N.J., Waanders, F.B.

“…Char-form analysis, whilst not yet an ISO standard, is a relatively common characterization method applied to pulverized coal samples used by power utilities…”
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Coal char temperature profile estimation using optical reflectance for a commercial-scale Sasol-Lurgi FBDB gasifier by Bunt, J.R., Joubert, J.P., Waanders, F.B.

“…In the Sasol-Lurgi fixed-bed dry-bottom (FBDB) gasifier the temperature in the combustion zone should not exceed the melting point of the ash-forming minerals,…”
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