As a carbon neutral and renewable source of energy, biomass carries a high potential to help sustain the future energy demand. The co-firing of coal and biomass mixtures is an alternative fuel route for the existing coal based reactors. The main challenges associated with co-firing involves proper understanding of the co-firing behavior of blended coal-biomass fuels, and proper understanding of advanced gasification systems used for converting such blended fuels to energy. The pyrolysis and combustion behavior of coal-biomass mixtures was quantified by devising laboratory experiments and mathematical models. The pyrolysis-combustion behavior of blended fuels was quantified on the basis of their physicochemical, kinetic, energetic and evolved gas behavior during pyrolysis/combustion. The energetic behavior of fuels was quantified by applying mathematical models onto the experimental data to obtain heat of pyrolysis and heat of combustion. Fuel performance models were developed to compare the pyrolysis and combustion performance of non-blended and blended fuels. The effect of blended fuel briquetting was also analyzed to find solutions related to coal and biomass co-firing by developing a bench scale fuel combustion setup. The collected data was analyzed to identify the effects of fuel blending and briquetting on fuel combustion performance, ignitability, flammability and evolved pollutant gases. A further effort was made in this research to develop the understanding of fluidized bed hydrodynamics. A lab scale cold-flow fluidized bed setup was developed and novel non-intrusive techniques were applied to quantify the hydrodynamics behavior. Particle Image Velocimetry and Digital Image Analysis algorithms were used to investigate the evolution of multiple inlet gas jets located at its distributor base. Results were used to develop a comprehensive grid-zone phenomenological model and determine hydrodynamics parameters such as jet particle entrainment velocities and void fraction among others. The results were further used to study the effect of fluidization velocity, particle diameter, particle density, distributor orifice diameter and orifice pitch on the solid circulation in fluidized beds. / Ph. D.

The photographer discusses his work in Reclamation: The Towns of the Virginia Coalfields, a Master of Fine Arts thesis exhibit held at the Tipton Gallery from February 12th through February 23, 2024. The exhibition focuses on coal towns located in the southwestern part of Virginia. The exhibition consists of 20 framed, archival inkjet prints. Each framed work is 36” x 24” and is representative of the artist’s exploration of the towns. A catalog of the exhibit is included at the end of this thesis. Owens examines formal and conceptual artistic influences, both historical and contemporary. Historic and contemporary photographic influences include Dorothea Lange, Victoria Sambunaris, Carol Highsmith, Andrew Borowiec, Stacy Kranitz, Frank Hunter, Mike Smith, and Builder Levy.

Recently, an efficient resource model updating framework was proposed with the aim of improving the raw material quality control and process efficiency in any type of mining operation. This includes the integration of online-sensor measurements that are obtained during the production into the resource model. The concept has been applied in a coal mining environment with the aim of identifying local impurities in a coal seam and to improve the prediction of coal quality attributes in neighbouring blocks. The goal of this presentation is to demonstrate how the use of the resource model updating framework can provide added value for the mining industry. Both economical and environmental considerations are taken into account when the added value is investigated.

M. Tech. (Department of Chemical Engineering, Faculty of Engineering and Technology): Vaal University of Technology / Strict environmental regulation on flue gas emission has led to the implementation of FGD technologies in power stations. Wet FGD technology is commonly used because it has high SO2 removal efficiency, high sorbent utilization and due to availability of the sorbent (limestone) used. SO2 is removed by passing flue gas through the absorber where it reacts with the slurry containing calcium ions which is obtained by dissolution. This study presents the findings of the dissolution of a calcium-based material (limestone) for wet FGD process. This was done using a pH stat apparatus and adipic acid as acid titrant. Adipic acid was used because of its buffering effect in wet FGD process. The conditions used for this study are similar to what is encountered in a wet FGD process. The extent of dissolution was determined by analyzing the amount of calcium ions in solution at different dissolution periods. The dissolution kinetics were correlated to the shrinking core model and it was found out that chemical reaction at the surface of the particle is the rate controlling step. This study also investigated the dissolution of coal fly ash and bottom ash. Their dissolution kinetics showed that the diffusion through the product layer was the rate controlling step due to an ash layer formed around the particle. The formation of ash layer was attributed to pozzolanic reaction products which is calcium-alumino-silicate (anorthite) compounds were formed after dissolution. The effect of fly ash on the dissolution of rate of limestone was also studied using response surface methodology. Limestone reactivity was found to increase with increase in the amount of fly ash added and the pH was found to be strong function of the rate constant compared to other dissolution variables. The presence of silica and alumina in fly ash led to a significant increase in the specific surface area due to hydration products formed after dissolution. / Eskom

In an ever-changing world where economic growth is inter-alia dependent on the export of bulk minerals, the risk and the severity of risk incidences in the bulk mineral supply chain should be minimised. In South Africa the export of coal is a large contributor to the GDP and any risk to this supply chain will directly affect its contribution to the GDP. Although all the stakeholders in the bulk coal export logistic chain manage the risk in their own domain, the bulk export logistic chain represents a supply chain structure where the risk of one stakeholder influences the risk of another stakeholder. Therefore, to reduce the total risk, an integrated risk management framework for the bulk coal export logistic chain is required. This study investigated the risks and the risk management processes in the bulk coal export supply chain. This logistic chain was chosen based on the monetary value the chain represents and the contribution to the GDP. A qualitative research design was used with one-on-one interviews and content analysis of risk management policies and procedures to obtain the data. The study revealed that there are risks that could not be managed on an individual stakeholder level and therefore an integrated risk management approach that considers the total bulk coal logistics export chain is required. / Entrepreneurship and Supply Chain, Transport, Tourism and Logistics Management / M. Com (Logistics Management)

Climate change adaptation has received limited attention compared to mitigation across all spatial levels. This is besides the documented adverse impacts of climate change in different sectors of societies including mining in general and coal mining specifically. Against this background, the study set three objectives. The first objective was to identify current and possible future climate change impacts that may affect selected coal mines in South Africa. The second objective was to establish the nature and extent to which these mines were ready to address and implement adaptation measures. The last objective was to determine and document existing climate change adaptation practices in selected mines. Employing the mixed methods approach, the research engaged five coal mines located in Mpumalanga, Free State and Kwa Zulu-Natal, gathering both the qualitative and quantitative data. This data was analysed thematically. The research made three major findings. The first finding was that the climatic conditions in the research areas have been changing over the observed period. In general, rainfall has been declining and temperatures have been increasing, leading to increased cases of extreme fog, mist and heatwaves. The second finding was that there has been an increase in frequency and intensity of extreme weather events, most notably, floods and droughts. These changes in the climate and associated weather events have frequently affected mine operations particularly at the production sub-chain of the coal mining value chain. The third major finding was that despite this evidence of adverse impact of climate change on the production sub-chain of the South African coal mining value chain, adaption responses in all the studied mines showed reactive adaptation to extreme events instead of proactive adaptation planning and implementation. South Africa depends on coal-derived energy, electricity in particular and the coal mines are implicitly exposed and vulnerable to the adverse impacts of climate change. Reducing this exposure and vulnerability dictates the urgent need to implement anticipatory adaptation measures in all the sub-chains of the coal mining value chain. / Environmental Sciences / D. Litt. et Phil (Environmental management)

PhD (Environmental Management) / Mining and mining-related activities remain the world’s most intensive, primary industrial activity undertaken with severe environmental impact. Coal mining falls within these primary undertakings, while coal burning for energy use further adds to environmental degradation. Coal burning is by far the least expensive and thus the most affordable means of energy supply to the South Africa low-income communities. It is likely that this status quo will continue indefinitely. The use of coal as an energy source in South African communities has been inherited with its resultant environmental (physical), social and economic implications. The physical implications are the actual hazards associated with coal during and after mining activities. “Physical hazards” include processes generating coal dust, coal ash and gaseous emissions, and hazards that manifest themselves from the existence of coal mining at a particular site, such as spontaneous combustion, surface instability and acid mine-water drainage. “Social hazards” are mostly the social and economic effects that are related to health. Social hazards associated with coal mining, coal processing and coal usage include dilution of cultural values, ethics, norms and the growth of informal sectors, for example, settlements and trade. Some of these hazards are immediate, while others are long-term and cumulative. Emphasis was placed on the cumulative effects of mining activities and the need to address issues relating to communities that live close to mining operations. This process of addressing community concerns is known as “creating a sustainable mining community”. South Africa hosted the 2002 World Summit on Sustainable Development and is a signatory of the working plan of action known as the Johannesburg Plan of Implementation. Therefore, one would expect to see that mining communities in South Africa are acting on and benefiting from this plan of action. The aim of this research is to assess the effectiveness of the 2002 World Summit on Sustainable Development and the Johannesburg Plan of Implementation in promoting sustainable mining and sustainable communities through changes in practices, perceptions and community participation in decision making. The research, undertaken during February to June 2007, examines the role of stakeholders and local authorities in basic environmental decisions. Environmental decisions examined were the provision of education and information to the community, uplifting community welfare through corporate social investment and corporate social responsibility. The surrounding communities of eMalahleni (formerly Witbank) in the Mpumalanga (Highveld) coal-mining region – were identified as a suitable area for this case study. Social research tools, comprising multiple-choice and open-ended questions administered to 6 790 respondents (3 930 learners and 2 860 general adult population), 650 voluntary comments, six individual interviews, and a 20 member focus group discussion, were used. Photographic images and personal observation provided meaning to results by presenting the quantitative and qualitative data visually. A blended methodological approach was used to analyse the data using descriptive statistics and a t-test for variance. Tables, bar graphs and pie charts were the various representative techniques deployed during the analysis. Data were analysed comparing statistical input and responses of the learners and the general population. Results presented show that the studied community is aware of some hazards associated with coal from the mining process to indoor combustion. The community studied is aware of the need for pro-active measures to protect their community. Members of the community are not aware of company decisions affecting the community with regard to coal hazards. They are also unaware of the existence and application of environmental legislation. Awareness was not linked to education or information obtained from a reliable source, such as a mining company or a local authority. It was based on personal experience, longevity of dwelling in the community and observation of the health conditions of relatives and friends. Some voluntary comments from the respondents and photographic images are included to support the community’s outlook. The research concluded that there are more unidentified hazards in the community than were covered in the structured questionnaires. The responses received to the questionnaires exposed the mining industry as being dismissive when it came to applying the law. This evasive behaviour emanates from the laxity of the enforcement departments and responsible authorities. More needs to be done to attain the requirements of the Johannesburg Plan of Implementation as agreed upon at the 2002 World Summit on Sustainable Development.

No description available.

Thesis (MBA)--Stellenbosch University, 2000. / Boschmans Colliery is, as is the case in the rest of the mining industry, heavily reliant on skilled persons in the Engineering discipline to install and maintain the machinery and infrastructure required for the production of a saleable product. Historically, apprentices were recruited from the ranks of school leavers and were given a good, albeit somewhat condensed training to qualify them as artisans. Artisans on their own are however not able to accomplish the tasks at hand and are therefore assisted by artisan assistants. Artisan assistants were historically recruited from the ranks of the unskilled, and in many instances, illiterate masses and were reliant on an unstructured process of on the job training while working under the direct supervision of an artisan. Given the complexities of modern coal mining machinery, the high cost of labour and training, the inherent dangers associated with the mining process and the requirements of the legislative framework, the current approach whereby all the Engineering skills are concentrated in a select few is no longer acceptable. The current system of apprentice training shortcomings are highlighted and a new system of training Engineering employees from the entry level onward is proposed.

Thesis (MBA (Business Management))--Stellenbosch University, 2008. / ENGLISH ABSTRACT: Xstrata Coal South Africa (XCSA) embarked on a restructuring exercise towards the end of 2005 to enable the organisation and its management to adapt to the pressures and requirements of an ever-changing South African coal industry. The executive team of XCSA felt that some of the business units were too large to be effectively managed by one general manager and his/her management team. The Tweefontein and Impunzi business units fell into this category. Further, the executive team felt that the existing organisational structures on the mines were unable to effectively manage the demands coming from an ever-changing coal industry. Most such demands emanated from sustainable development issues: workplace safety, environmental management, health-related concerns to do with the employees and community development around the mines. The restructuring took place towards the end of 2005, not long after the restructuring of the business performance went into decline. The author of this thesis, as the General Manager of the Tweefontein Complex from the beginning of 2006 until mid-2008, was responsible for the day-to-day management of the division at the time. After explaining the need for restructuring, as well as how the structure was changed, the author will describe a comprehensive literature research study. The aim of such a study is to create a common understanding with the reader of the principles relating to culture, leadership and change management. The author then compares the two climate assessments of the organisational culture of the Boschmans Colliery undertaken during 2005 prior to embarking on the restructuring exercise, and of the Tweefontein Complex undertaken during 2007, on completion of the restructuring. Boschmans Colliery employees now constitute most of the underground and surface operations areas of the Tweefontein Complex. The organisational culture of the Tweefontein Complex was found to have been influenced by the restructuring exercise. The author concludes with recommendations on how the organisational culture of XCSA as a whole could be aligned. Chief among the recommendations are that: • A cultural alignment programme should be implemented to create a common organisational culture across XCSA. • A leadership development programme should be implemented to promote the desired organisational culture. • A communication strategy should be implemented to support the cultural alignment programme. • A branding campaign should be launched to strengthen the image of XCSA within the surrounding community. / AFRIKAANSE OPSOMMING: Xstrata Coal South Africa (XCSA) het aan die einde van 2005 besluit om die besigheid te herstruktureer om aan te pas by die veranderende aard van die Suid-Afrikaanse steenkoolindustrie. Die gevoel van die uitvoerende komitee was dat sekere van die besigheidseenhede te groot was om effektief deur een algemene bestuurder, bestuur te word. Die Tweefontein- en Impunzi-besigheidseenhede het in die kategorie geval. Verder het die uitvoerende kommitee gevoel dat die bestaande bestuurstruktuur per myn nie voldoende was om al die verwagtinge vanuit 'n vinnig veranderende steenkoolindustrie effektief te kan bestuur nie. Die vernaamste verwagtinge van die vinnig veranderende industrie was die vanuit die veld van Volhoubaarheid, naamlik veiligheid op myne, omgewingsbewustheid, gesondheid van die werknemers, sowel as die opbou van die gemeenskap. Die herstrukturering het aan die einde van 2005 plaasgevind en nie lank na die herstrukturering nie het die prestasie van die besigheid drasties afgeneem. Die skrywer was die Algemene Bestuurder van die Tweefontein Complex vanaf die begin van 2006 tot die middel van 2008, en was verantwoordelik vir die dag-tot-dag-bestuur van die afdeling. As deel van die studie sal die skrywer eerstens poog om die redes vir die herstrukturering te gee en ook hoe die nuwe struktuur daar uitsien. Tweedens sal die skrywer 'n deeglike literatuurstudie verskaf om 'n gemeenskaplike verstandhouding tussen die skrywer en die leser oor die beginsels van kultuur, leierskap en veranderingsbestuur te skep. Derdens sal die skrywer die resultate van twee klimaatstudies ontleed wat op die besigheidskultuur van die Boschmans-steenkoolmyn in 2005 voor die herstrukturering gedoen is en een wat in 2007 op die Tweefontein Complex na die herstrukturering gedoen is. Die werknemers van die Boschmans-steenkoolmyn maak tans die grootste gedeelte van die Tweefontein Complex se ondergrondse en aanleg- en logistieke afdelings uit. Na aanleiding van die analise van die twee klimaatstudies, bevind die skrywer dat die herstrukturering 'n daadwerklike invloed op die kultuur van die Tweefontein Complex gehad het. Die skrywer maak dan na gelang van sy bevindinge aanbevelings oor hoe die kultuur van Xstrata Coal South Africa (XCSA) as 'n geheel belyn kan word. Sy belangrikste aanbevelings is as volg: • Die implementering van 'n kultuurbelyningsprogram om 'n gemeenskaplike besigheidskultuur regoor Xstrata Coal South Africa (XCSA) daar te stel. • Die implementering van 'n leierskapsontwikkelingsprogram wat belyn is met die verlangde besigheidskultuur. • Die implementering van 'n kommunikasiestrategie wat die kultuurbelyningsprogram ondersteun. • Die loodsing van 'n Xstrata Coal South Africa (XCSA) bemarkingsveldtog am Xstrata Coal se beeld in die gemeenskap te bevorder.