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Browsing by Author "Oboirien, BO"

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Analysis of clean coal technology in Nigeria for energy generation

Author: Oboirien, BO ; North, Brian C ; Obayopo, SO ; Odusote, JK ; Sadiku, ER Date: Apr 2018 An analysis of clean coal technologies for the recovery of energy from Nigerian coals was carried out. The coal mines studied are Onyeama, Ogwashi, Ezimo, Inyi, Amasiodo, Okaba, Lafia-Obi, Owukpa Owukpa, Ogboyoga and Okpara. The estimated ... Read more
Characterisation of coal and chars in fluidised bed gasification

Author: Oboirien, BO ; Engelbrecht, AD ; North, Brian C ; Du Cann, VM ; Falcon, R Date: Mar 2009 There is currently a gap in the understanding of the morphological transformations experienced by high ash and intertinite-rich coals undergoing conversion to char during atmospheric gasification. In this study, work has been carried to ... Read more
Enrichment of trace elements in bottom ash from coal oxy-combustion: Effect of coal types

Author: Oboirien, BO ; Thulari, V ; North, Brian C Date: Sep 2016 In this study, the enrichment of trace elements in two coals under air and oxy-combustion conditions was studied. Twenty-one trace elements were evaluated. The two coal samples had a different concentration for the 21 trace elements, which ... Read more
Fluidised bed gasification of high-ash South African coals: An experimental and modelling study

Author: Engelbrecht, AS ; North, Brian C ; Oboirien, BO ; Everson, RC ; Neomagus, HWPJ Date: Nov 2011 The gasification of two high-ash coals were studied using a pilot scale fluidised bed gasifier using oxygen enrich air and steam as the gasification agents. The results of the tests show that the fixed carbon conversion and calorific value ... Read more
Fungi solubilisation of low rank coal: performances of stirred tank, fluidised bed and packed bed reactors

Author: Oboirien, BO ; Ojumu, TV ; Obayopo, SO Date: Feb 2013 Coal biosolubilisation was investigated in stirred tank reactor, fluidised bed and fixed bed bioreactors with a view to highlight the advantages and shortcomings of each of these reactor configurations. The stirred aerated bioreactor and ... Read more
Major and trace elements in coal bottom ash at different oxy coal combustion conditions

Author: Oboirien, BO ; Thulari, V ; North, Brian C Date: Sep 2014 This paper presents a detailed study on the effect of temperature on the concentration of 27 major and trace elements in bottom ash generated from oxy fuel-combustion. The major elements are Na, Mg, Al, K, Ca and Fe and the minor and trace ... Read more
Making the most of South Africa’s low-quality coal: Converting high-ash coal to fuel gas using bubbling fluidised bed gasifiers

Author: Engelbrecht, AD ; North, Brian C ; Oboirien, BO Date: 31 Aug 2010 South Africa has abundant resources of high-ash and other low-quality coals. The aim of this work is to investigate the possibility of using fluidised bed gasification technology to convert these coals into clean fuel gas. The fuel gas can ... Read more
Microwave-assisted synthesis of geopolymers from fluidised bed gasifier bottom ash

Author: Oboirien, BO ; North, Brian C ; Sadiku, ER Date: Sep 2013 Fluidised bed gasification (FBG) is a clean coal technology suitable for power and fuel generation from low grade coals. However, the resulting bottom ash presents some disposal challenges to the power plants and the environment. The production ... Read more
Mineral-char interaction during gasification of high-ash coals in fluidized-bed gasification

Author: Oboirien, BO ; Engelbrecht, AD ; North, Brian C ; Eramus, RM ; Falcon, R Date: Sep 2011 The mineral-char interaction can occur during the gasification of high-ash coals in fluidized-bed gasifiers when the melted minerals cover the char surface by penetrating into the cracks and pores of the char. In addition to the physical ... Read more
Performance evaluation of South African coals under oxy-fuel

Author: Mathekga, HI ; Oboirien, BO ; Engelbrecht, A ; North, Brian C ; Premlal, K Date: Jul 2016 In this study, the experimental results of the oxy-fluidized combustion of three different South African coals (sub-bituminous) are presented. The coal samples were denoted Coal A, B, and C. Three combustion atmospheres—air, oxy (21% O(sub2)/79% ... Read more
A review of oxy-fuel combustion in fluidized bed reactors

Author: Mathekga, HI ; Oboirien, BO ; North, Brian C Date: Jun 2016 Presently, there is no detailed review that summarizes the current knowledge status on oxy-fuel combustion in fluidized bed combustors. This paper reviewed the existing literature in heat transfer, char combustion and pollutant emissions ... Read more
Study on the structure and gasification characteristics of selected South African bituminous coal in fluidised bed gasification

Author: Oboirien, BO ; Engelbrecht, AD ; North, Brian C ; Du Cann, VM ; Verryn, S ; Falcon, R Date: Oct 2009 The gasification characteristics of three South African bituminous coals were investigated in a bubbling fluidised bed reactor. The three coals are similar in rank, but two are inertinite-rich coals and the third has high vitrinite content. ... Read more
Study on the structure and gasification characteristics of selected South African bituminous coals in fluidised bed gasification

Author: Oboirien, BO ; Engelbrecht, AD ; North, Brian C ; Du Cann, VM ; Verryn, S ; Falcon, R Date: Apr 2011 The gasification characteristics of three South African bituminous coals were investigated in a bubbling fluidised bed reactor. The three coals are similar in rank, but two are inertinite-rich coals and the third has a high vitrinite content. ... Read more
A Techno-economic Analysis of Anaerobic Digestion and Gasification Hybrid System: Energy Recovery from Municipal Solid Waste in South Africa

Author: Mabalane, PN ; Oboirien, BO ; Masukume, Mike Date: Mar 2020 Due to the increased population growth in South Africa, particularly in urban areas, the generation of municipal solid waste has increased and so is the demand of energy. Municipal solid waste can be considered a good candidate for electricity ... Read more
Techno-economic assessments of oxy-fuel technology for South African coal-fired power stations

Author: Oboirien, BO ; North, Brian C ; Kleyn, T Date: Mar 2014 Oxy-fuel technology is one of the potential solutions to reduce CO(sub2) emissions from coal-fired power plants. Although vendors offer a “retrofit package,” to the best of our knowledge there has not been a study undertaken that looks at the ... Read more
Textural properties of chars as determined by petrographic analysis: comparison between air-blown, oxygen-blown and oxygen-enriched gasification

Author: Oboirien, BO ; Engelbrecht, AD ; North, Brian C ; Du Cann, VM ; Falcon, R Date: Nov 2012 In this study, the textural properties of chars generated from a vitrinite, high ash coal in a fluidised bed gasifier under air-blown, oxygen-blown and oxygen-enriched conditions were determined by detailed petrographic analysis. The char ... Read more

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