Browsing Faculty of Engineering by Author "10168249 - Everson, Raymond Cecil"
Now showing items 1-20 of 48
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The adsorption of copper in a packed-bed of chitosan beads: Modeling, multiple adsorption and regeneration
Osifo, Peter O.; Neomagus, Hein W.J.P.; Everson, Raymond C.; Webster, Athena; Gun, Marius A. (Elsevier, 2009)In this study, exoskeletons of Cape rock lobsters were used as raw material in the preparation of chitin that was successively deacetylated to chitosan flakes. The chitosan flakes were modified into chitosan beads and the ... -
Assessing the catalytic effect of coal ash constituents on the CO2 gasification rate of high ash, South African coal
Hattingh, Burgert B.; Everson, Raymond C.; Neomagus, Hein W.J.P.; Bunt, John R. (Elsevier, 2011)The catalytic effect of inorganic species, within the ash, on the CO2 gasification of three South African coals containing similar carbon-structural properties (elemental, structural and petrographical properties) was ... -
The carbon dioxide gasification characteristics of biomass char samples and their effect on coal gasification reactivity during co-gasification
Mafu, Lihle D.; Neomagus, Hein W.J.P.; Everson, Raymond C.; Strydom, Christien A.; Bunt, John R. (Elsevier, 2018)The carbon dioxide gasification characteristics of three biomass char samples and bituminous coal char were investigated in a thermogravimetric analyser in the temperature range of 850–950 °C. Char SB exhibited higher ... -
The carbon dioxide, methane and nitrogen high-pressure sorption properties of South African bituminous coals
Okolo, Gregory N.; Everson, Raymond C.; Neomagus, Hein W.J.P.; Bunt, John R.; Sakurovs, Richard (Elsevier, 2019)In this paper, we report the CO2, CH4 and N2 sorption isotherms of four dry South African bituminous coals at pressures up to 16 MPa at 55 °C. The sorption capacities of the samples with respect to the adsorbate gases ... -
CFD modeling of particle charging and collection in electrostatic precipitators
Arif, S.; Branken, D.J.; Everson, R.C.; Neomagus, H.W.J.P.; Le Grange, L.A.; Arif, A. (Elsevier, 2016)A CFD model was developed to describe the particle laden gas flow through an ESP, particle charging and collection. The corona discharge was modeled using the open source software OpenFOAM to solve the Poison and charge ... -
CFD simulation of an industrial wet flue gas desulfurization spray tower: a comprehensive model with special atttention devoted to the modeling of absorption and chemical reactions
Everson, Raymond; Arif, A.; Neomagus, H.; Branken, D. (International Pittsburgh Coal Conference, 2016) -
The characterisation of slow-heated inertinite- and vitrinite-rich coals from the South African coalfields
Roberts, Mokone J.; Everson, Raymond C.; Neomagus, Hein W.J.P.; Okolo, Gregory N.; Van Niekerk, Daniel (Elsevier, 2015)The development of coal char structures with pyrolysis has been extensively investigated but has traditionally been focused on the carboniferous coals in the northern Hemisphere. In this investigation, the properties of ... -
Chemical and structural characterization of char development during lignocellulosic biomass pyrolysis
Mafu, Lihle D.; Neomagus, Hein W.J.P.; Everson, Raymond C.; Strydom, Christien A.; Okolo, Gregory N.; Bunt, John R. (Elsevier, 2017)The chemical and structural changes of three lignocellulosic biomass samples during pyrolysis were investigated using both conventional and advanced characterization techniques. The use of ATR-FTIR as a characterization ... -
Chemical–structural properties of South African bituminous coals: insights from wide angle XRD–carbon fraction analysis, ATR–FTIR, solid state 13C NMR, and HRTEM techniques
Okolo, Gregory N.; Neomagus, Hein W.J.P.; Everson, Raymond C.; Roberts, Mokone J.; Bunt, John R. (Elsevier, 2015)The chemical–structural properties of four South African bituminous coals were investigated using wide angle X-ray diffraction–carbon fraction analysis (WAXRD–CFA), attenuated total reflection Fourier transform infra-red ... -
Coal reactivity and selection for solid-based pre-reduction of sponge iron
Van Wyk, S.; Neomagus, H.W.J.P.; Bunt, J.R.; Everson, R.C. (Taylor & Francis, 2020)Solid-based direct reduction of iron ore requires the reductant coal to have a suitable CO2 reactivity to achieve optimum pre-reduction within a rotary kiln. The CO2 reactivity is affected by numerous factors including ... -
Coal-derived low smoke fuel assessment through coal stove combustion testing
Kühn, Thys; Bunt, John R.; Neomagus, Hein W.J.P.; Piketh, Stuart J.; Everson, Raymond C.; Coetzee, Sansha (Elsevier, 2017)A study was undertaken to investigate the production of low smoke fuel from coal currently used in low-income households in South Africa. Pyrolysis of large coal lumps was studied as a possible production method, and an ... -
Comparing the porosity and surface areas of coal as measured by gas adsorption, mercury intrusion and SAXS techniques
Okolo, Gregory N.; Everson, Raymond C.; Neomagus, Hein W.J.P.; Roberts, Mokone J.; Sakurovs, Richard (Elsevier, 2015)In this paper, we compare the surface area, porosity and other physical–structural properties of four bituminous coals from three different coal fields of South Africa determined using carbon dioxide (CO2) and nitrogen ... -
Dataset on the carbon dioxide, methane and nitrogen high-pressure sorption properties of South African bituminous coals
Okolo, Gregory N.; Everson, Raymond C.; Neomagus, Hein W.J.P.; Bunt, John R.; Sakurovs, Richard (Elsevier, 2019)The dataset presented in this article supplements the result and information published in the report “The carbon dioxide, methane and nitrogen high-pressure sorption properties of South African bituminous coals” (Okolo et ... -
Density functional theory molecular modelling and experimental particle kinetics for CO2-char gasification
Roberts, Mokone J.; Everson, Raymond C.; Neomagus, Hein W.J.P.; Van Sittert, Cornelia G.C.E.; Okolo, Gregory N. (Elsevier, 2015)Experimental measurements and DFT atomistic modelling were conducted to elucidate the mechanisms for gasification chemistry of char with CO2 gas. The molecular models used were based on experimental representations of coal ... -
Detailed characterization of SA high mineral matter inertinite–rich coals and density fractions and effect on reaction rates with carbon dioxide: macerals, microlithotypes, carbominerites and minerals
Everson, Raymond C.; Koekemoer, Andrei; Bunt, John R.; Neomagus, Hein W.J.P.; Schwarz, Christopher (SAIChE, 2013)An investigation was undertaken to determine the distribution of macerals and minerals in South African Highveld coal deposits as well as density fractions derived from a typical deposit. The corresponding effects on ... -
Development of an integrated model for absorption of sulphur dioxide in limestone slurry
Mchabe, D.; Everson, R.C.; Ramachandran, P.A.; Neomagus, H.W.J.P.; Branken, D.J. (Elsevier, 2021)The aim of this study is to develop an integrated model for SO2 absorption into limestone slurry consisting of four sub-models, namely, absorption of SO2; desorption of CO2; dissolution of limestone and crystallization of ... -
Dissolution kinetics of sorbents and effect of additives in wet flue gas desulfurization
Koech, Lawrence; Everson, Ray; Neomagus, Hein; Rutto, Hilary (De Gruyter, 2014)Flue gas desulfurization (FGD) technology has been adopted by a number of power stations for the removal of sulfur dioxide (SO2) from flue gas. The wet FGD system is the most commonly used process because of high SO2 removal ... -
Dissolution kinetics of South African coal fly ash and the development of a semi-empirical model to predict dissolution
Koech, Lawrence; Everson, Ray; Neomagus, Hein; Rutto, Hilary (Association of the Chemical Engineers of Serbia AChE, 2015)Wet flue gas desulphurization (FGD) is a crucial technology which can be used to abate the emission of sulphur dioxide in coal power plants. The dissolution of coal fly ash in adipic acid is investigated by varying acid ... -
The effect of acid demineralising bituminous coals and de-ashing the respective chars on nitrogen functional forms
Phiri, Zebron; Everson, Raymond C.; Neomagus, Hein W.J.P.; Wood, Barry J. (Elsevier, 2017)An opportunity presented itself to compare changes in nitrogen functional forms brought by the acid treatment of South African bituminous coals and their respective chars. X-ray photoelectron spectroscopy (XPS) was used ... -
The effect of carbon dioxide partial pressure on the gasification rate and pore development of Highveld coal chars at elevated pressures
Gouws, Saartjie M.; Neomagus, Hein W.J.P.; Bunt, John R.; Everson, Ray C.; Roberts, Daniel G. (Elsevier, 2018)Char structural changes occurring during gasification are normally only related to conversion and few data is published on the effect of carbon dioxide partial pressure on the extent of pore development. In this study, the ...