Browsing Electronic Theses and Dissertations (ETDs) by Subject "Coal"
Now showing items 1-10 of 12
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An analysis of the sustainable mining of selected minerals and metals in South Africa
(North-West University, 2011)The study was done to understand the direction in which South Africa’s mining model is developed and the changes required for South Africa to take its rightful place in the mainstream spheres of economic and commercial ... -
Co-pyrolysis of torrefied biomass and coal : product evaluation and reaction modelling
(North-West University (South Africa)., 2022)The co-utilization of biomass and coal in existing coal-based conversion technologies has received increasing interest for its ability to reduce the dependence on fossil fuels and produce high quality products. However, ... -
Coal washability determination using RhoVol technology
(North-West University (South Africa)., 2023-10)Density is one of the key properties of coal and provides information about its physical and chemical composition. Washability analyses (or densimetric information) are used to specify the yield and quality of clean coal ... -
The design and operational behaviour of a laboratory scale fixed-bed gasifier
(North-West University (South Africa) , Potchefstroom Campus, 2016)Fixed bed coal gasification and combustion operations form an important part in the global energy supply, and these processes are characterized by complex interactions which are difficult to study on an industrial scale. ... -
Development of a micro burner for the experimental determination of the net calorific value at constant pressure of pulverised coal
(North-West University (South Africa), 2019)Coal combustion remains the major resource of power generation internationally. Coal consists of different substances, which influence its quality and properties. One such property is the calorific value (CV), which specifies ... -
Development of a micro scale pulverised coal test burner
(North-West University (South Africa) , Potchefstroom Campus, 2016)The power demand in South Africa continues to grow which makes it more important to understand different input parameters in power stations. One of these input parameters is the calorific value (CV) of coal. The current ... -
Effect of alkaline activator composition on the geopolymer properties produced from South African power station fly ash
(North-West University (South Africa)., 2022)Eskom produce ~36 million tons of ash annually, of which 90 % is fly ash. Only 7 % of the ash is valorised; much lower than the global average of ~75 %. Geopolymer production from fly ash, as a Portland cement substitute, ... -
Evaluation of the gasification reactivity of Highveld coals for application in the coal to liquids process
(North-West University (South Africa) , Potchefstroom Campus, 2017)Coal is a very heterogeneous substance with widely varying properties from one source to another, requiring continuous analysis to determine the properties and reaction behaviour of coals as new sources become mined. There ... -
The influence of CO? on the steam gasification rate of a typical South African coal
(North-West University, 2013)It is recognised that the reactions with steam and CO2 are the rate limiting step during coal gasification, and a vast number of studies has been dedicated to the kinetics of these reactions. Most studies were carried out ... -
Integrated drying and screening of small coal particles
(North-West University (South Africa)., 2022)The recent development of dry beneficiation technologies were motivated by the shortage of water, not only in South Africa, but in many other coal producing countries worldwide. The low capital and operating costs associated ...