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Tesi sul tema "Underground coal gasification"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 30 luglio 2024

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1

Perkins, Gregory Martin Parry Materials Science &amp Engineering Faculty of Science UNSW. "Mathematical modelling of underground coal gasification." Awarded by:University of New South Wales. Materials Science and Engineering, 2005. http://handle.unsw.edu.au/1959.4/25518.

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Mathematical models were developed to understand cavity growth mechanisms, heat and mass transfer in combination with chemical reaction, and the factors which affect gas production from an underground coal gasifier. A model for coal gasification in a one-dimensional spatial domain was developed and validated through comparison with experimental measurements of the pyrolysis of large coal particles and cylindrical coal blocks. The effects of changes in operating conditions and coal properties on cavity growth were quantified. It was found that the operating conditions which have the greatest im

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2

Mortazavi, Hamid Reza. "Rubbling and structural stability of underground coal gasification reactors /." Thesis, Connect to this title online; UW restricted, 1989. http://hdl.handle.net/1773/7051.

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3

Roullier, Benjamin David. "Modelling the local environmental impact of underground coal gasification." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/40878/.

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Underground coal gasification (UCG) has the potential to access vast resources of stored fossil energy in a safe, clean and environmentally sound manner. Previous experiments have however led to concerns around surface subsidence, groundwater pollution and water table lowering. These issues can be prevented through the use of appropriate site selection and an understanding of the processes which cause these effects. Numerical simulations provide a cost effective means of predicting these issues without the need for costly and publically opposed field trials. This work uses a commercially avail

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4

González, Martínez de Miguel Gerardo José. "A hydromechanically-based risk framework for CO₂ storage coupled to underground coal gasification." Thesis, University of Newcastle upon Tyne, 2014. http://hdl.handle.net/10443/2579.

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Most of the energy produced in the world comes from fossil fuels: coal, oil and gas. Amongst them, coal is the most abundant and widespread fossil fuel in the world. Underground Coal Gasi cation (UCG), an in situ method to extract the calori c value of the coal, has been known for a century but has had very limited implementation throughout the world, mainly due to the availability of cheap oil over that period. It is now gaining relevance in order to unlock vast resources of coal currently not exploitable by conventional mining. However, growing concern on increased levels of carbon dioxide c

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5

Hyder, Zeshan. "Site Characterization, Sustainability Evaluation and Life Cycle Emissions Assessment of Underground Coal Gasification." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/28970.

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Underground Coal Gasification (UCG), although not a new concept, is now attracting considerable global attention as a viable process to provide a â cleanâ and economic fuel from coal. Climate change legislation and the declining position of coal reserves (i.e., deeper and thinner seams) in many parts of the world are promoting and fueling the UCG renaissance. This research presents an analysis of operational parameters of UCG technology to determine their significance and to evaluate the effective range of values for proper control of the process. The study indicates that cavity pressures,

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6

Tian, Hong [Verfasser]. "Development of a thermo-mechanical model for rocks exposed to high temperatures during underground coal gasification / Hong Tian." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2013. http://d-nb.info/1035674211/34.

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7

Nakaten, Natalie Christine [Verfasser]. "Economic competitiveness of underground coal gasification combined with carbon capture and storage in the Bulgarian energy network / Natalie Christine Nakaten." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2015. http://d-nb.info/1076066712/34.

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8

Konstantinou, Eleni. "An experimental study on the impact of temperature, gasifying agents composition and pressure in the conversion of coal chars to combustible gas products in the context of Underground Coal Gasification." Thesis, Cardiff University, 2016. http://orca.cf.ac.uk/98615/.

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The key controlling factor in the effective energy conversion of coal to combustible gases during the UCG process is the behaviour of the pyrolysed char in the reduction zone of the UCG cavity, which has not been published in available academic literature. This study investigates the impact of the operating parameters during the reduction zone of UCG using a bespoke high pressure high temperature rig which was developed as part of this research work. This rig, operating at temperatures of up to 900 oC and at pressures up to 5.0 MPa, simulates the UCG process including each UCG zone individuall

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9

Schrier, Loren Clare. "Identification of by-products and investigation into the dechlorination mechanism of the Chemchar cocurrent flow gasification process by gas chromatography-mass selective detection /." free to MU campus, to others for purchase, 1998. http://wwwlib.umi.com/cr/mo/fullcit?p9904867.

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Thesis (Ph. D.)--University of Missouri-Columbia, 1998.<br>Trademark symbol follows Chemchar in title. Typescript. Vita. Includes bibliographical references (leaf 130). Also available on the Internet.

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10

Otto, Christopher [Verfasser], Michael [Akademischer Betreuer] Kühn, and Thomas [Akademischer Betreuer] Kempka. "Numerical analysis of thermal, hydraulic and mechanical processes in the near- and far-field of underground coal gasification reactors / Christopher Otto ; Michael Kühn, Thomas Kempka." Potsdam : Universität Potsdam, 2017. http://d-nb.info/1218402946/34.

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11

Sampaio, Igor Almeida. "Comportamento mecânico e acústico em arenitos submetidos ao ciclo de aquecimento e resfriamento." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2018. http://hdl.handle.net/10183/186130.

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Com o aumento crescente das restrições ambientais acompanhado do aumento crescente da demanda energética e matéria-prima pela população que cresce em proporções assustadores com poucos indícios de sua descida fizeram com que buscassem alternativas com viabilidade econômica e reduzisse os impactos ambientais. Para o carvão mineral, a alternativa encontrada é a Gaseificação do Carvão em Subsolo. Das vantagens encontradas com o processo, as mais interessantes são: a segurança operacional e pouca infraestrutura necessária, competitividade no preço do produto gerado (gás sintético) e pouco gerencia

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12

Klebingat, Stefan [Verfasser], Rafig Akademischer Betreuer] Azzam, and Peter [Akademischer Betreuer] [Quicker. "Development, validation and scenario analyses of two Underground Coal Gasification (UCG) model approaches focussing on gas quality-tar production control and tar pollutant-water solubility risk prognoses / Stefan Klebingat ; Rafig Azzam, Peter Georg Quicker." Aachen : Universitätsbibliothek der RWTH Aachen, 2016. http://d-nb.info/1157122434/34.

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13

Abdel, Hadi Eed Abdel Hafez A. "Computer modelling of underground coal gasification." 1985. http://hdl.handle.net/1993/29216.

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14

Moodley, Keeshan. "Process evaluation of underground coal gasification: an exergy analysis." Thesis, 2016. http://hdl.handle.net/10539/22599.

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A dissertation submitted to the Faculty of Engineering and the Built Environment, University of Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Master of Science in Engineering Johannesburg, 29 August 2016<br>This study discusses underground coal gasification (UCG) and the analysis thereof. Two main methods were used. The first is the Bond Equivalent Diagram, which gives an ideal of where operations should take place in relation to their coal and product gas compositions. This method was used to analyze several real life sites for their idealized and actual op

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15

Kitaka, Richard Herbertson. "Underground coal gasification : overview of an economic and environmental evaluation." Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-12-4535.

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This paper examines an overview of the economic and environmental aspects of Underground Coal Gasification (UCG) as a viable option to the above ground Surface Coal Gasification (SCG). In addition, some highlights, hurdles and opportunities from early investment to successful commercial application of some worldwide UCG projects will be discussed. Global energy demands have prompted continual crude oil consumption at an astronomical pace. As such, the most advanced economies are looking for local and bountiful resources to challenge crude oil's dependence for which coal provides the best alte

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16

Meintjies, Curtis Enrico. "A comparative life cycle assessment review of conventional pulverized coal-fired electricity generation and underground coal gasification (UCG) linked with an integrated gasification combined cycle (IGCC)." Thesis, 2011. http://hdl.handle.net/10539/10620.

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In a global climate where sustainable development is being prioritized for the benefit of current and future generations, it is necessary to make informed decisions about the type of technologies being deployed. Because coal plays such a significant role in the generation of electricity, understanding the impact it has on the environment is an important part of understanding energy and environmental issues in general. To this end, a Life Cycle Assessment (LCA) was performed on two methods of electricity generation which employ coal as a primary source of energy. This assessment focused on

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17

Dzimba, Buyisiwe Carol. "Consideration of the criteria required for the selection of potential underground coal gasification sites in South Africa." Thesis, 2011. http://hdl.handle.net/10539/10521.

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Underground coal gasification (UCG) is believed to be one of the cleaner coal exploiting technologies for energy generation. In this study UCG is assessed as a technology for unlocking coal seams that are too deeply buried underground for extraction and those which are enclosed by complex geological settings making it impossible to extract using conventional mining methods. The assessment of the UCG technique was based on a desktop study from previous UCG trials globally. The objective of this study was mainly focused on considering factors which could be useful in the selection of potential U

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