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Tesi sul tema "Coal"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Sexton, Dane. "Coal agglomeration in blast furnace injection coals." Thesis, Cardiff University, 2019. http://orca.cf.ac.uk/119742/.

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In order to reduce expensive coke usage, blast furnace operators inject coal to replace a portion of the coke. However, the use of some injection coals can result in blast furnace instability and lowered permeability. This thesis is concerned with the injection of coal under entrained flow, high heating rate (104-106 °C/s) blast furnace conditions, namely the possibility of coal particle agglomeration via the use of caking coals. Methods of mitigating agglomeration via blending and pre-oxidation are tested, whilst the resultant performance implications of agglomerated coal chars are considered

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2

Butler, J. "Coal structure." Thesis, University of Newcastle Upon Tyne, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378290.

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3

Skorupska, N. M. "Coal combustibility." Thesis, University of Newcastle Upon Tyne, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378852.

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4

Afonso, Joao Mealha Sequeira. "Electrical resistivity measurements in coal : assessment of coal-bed methane content, reserves and coal permeability." Thesis, University of Leicester, 2015. http://hdl.handle.net/2381/31591.

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Abstract (sommario):

Coal-bed methane (CBM), also referred to as Coal seam gas (CSG), relates to the production of methane from coal beds by drilling wells, hence lowering formation pressure, and triggering methane release. While the potential of this resource is significant, the assessment of the quantity and the producibility of methane from coal seams is highly variable. For this reason the objective of this work is to investigate the assessment of gas content, gas-in-place and coal permeability through petrophysical of analysis and by gaining a better understanding of coal bulk properties,. In this study 17 co

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5

Moreea, Ruksana Goolam Hossen. "Effects of solvents and coal properties in coal liquefaction." Thesis, Imperial College London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324958.

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6

Ratcliffe, Giles Stuart. "NMR of heteroatomic structures of coal and coal products." Thesis, University of Warwick, 1988. http://wrap.warwick.ac.uk/107456/.

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This thesis describes various applications of high field n.m.r. for the elucidation of coal structure, and concentrates on discovering the chemical environments of the heteroatoms in coal i.e. those elements other than carbon and hydrogen. Chapter 2 describes how hydroxyl groups may be converted to trimethyl siloxyl groups, observation of which by 29si n.m.r. allows one to determine the types of hydroxyl functionalities present in the original material. Such derivatization methods are well known. However trimethyl siloxyl groups give 29si resonances that have predictable chemical shifts and so

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7

Trechera, Ruiz Pedro. "Environmental and occupational characterisation of coals and dust from coal mining." Doctoral thesis, Universitat Politècnica de Catalunya, 2022. http://hdl.handle.net/10803/673571.

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The main objective of this PhD thesis is the study of coal mine dust patterns produced by different types of mining operations and different types of coal. In addition, the potential links between oxidative potential (OP) of coal dust and its geochemistry have been investigated in order to identify indicators of potential concern for human health. To these ends, extensive particle size, chemical, mineralogical and OP analyses were carried out on: i) deposited coal mine dust collected in from different areas in underground and open-pit coal mines; ii) a selection of powdered coal samples from i

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8

Singh, Shinelka. "The potential of QEMSCAN in predicting coal washability of Mpumalanga coals." Diss., University of Pretoria, 2015. http://hdl.handle.net/2263/60858.

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Traditional float and sink analyses are undertaken to determine the washability of coal. Float and sink analyses are costly, require toxic heavy organic liquids and the procedure to wash and dry the float and discard fractions is lengthy. QEMSCAN has the ability to characterise particle density based on the mineralogical composition of the particle. The objective of this research is to determine if QEMSCAN is a viable alternative to float and sink analysis. Float and sink analysis typically requires coarse size fractions while QEMSCAN analysis requires samples to be crushed down to 1mm. Any cr

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9

Meyer, Petrus C. "Feasibility of thin seam coal mining at Dorstfontein Coal Mine." Pretoria : [s.n.], 2003. http://upetd.up.ac.za/thesis/available/etd-09072005-113231/.

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10

Saha, Gautam. "The role of coal surface charge in catalyzed coal gasification." DigitalCommons@Robert W. Woodruff Library, Atlanta University Center, 1992. http://digitalcommons.auctr.edu/dissertations/2173.

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The influence of the electrokinetic properties of coal on the adsorption and gasification activities of calcium acetate and potassium carbonate has been studied. It has been found from zeta potential measurements on lignite, subbituminous and bituminous coals that the coal particles are negatively charged in both acidic and basic solutions, although the negative charge density is more pronounced in strongly alkaline media. In general, the extent of calcium or potassium adsorption correlated with the negative zeta potentials. Calcium or potassium adsorption followed the order lignite > subbitum

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11

Pourkashanian, M. "The combustion of residual fuel oil, coal and coal slurries." Thesis, University of Leeds, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380819.

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12

Meyer, Petrus Cornelius. "Feasibility of thin seam coal mining at Dorstfontein Coal Mine." Diss., University of Pretoria, 2003. http://hdl.handle.net/2263/27806.

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13

Holland, Troy Michael. "A Comprehensive Coal Conversion Model Extended to Oxy-Coal Conditions." BYU ScholarsArchive, 2017. https://scholarsarchive.byu.edu/etd/6525.

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Abstract (sommario):

CFD simulations are valuable tools in evaluating and deploying oxy-fuel and other carbon capture technologies either as retrofit technologies or for new construction. However, accurate predictive simulations require physically realistic submodels with low computational requirements. In particular, comprehensive char oxidation and gasification models have been developed that describe multiple reaction and diffusion processes. This work extends a comprehensive char conversion code (the Carbon Conversion Kinetics or CCK model), which treats surface oxidation and gasification reactions as well as

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14

Prayuenyong, P. "Biodesulphurisation of coal." Thesis, Cranfield University, 2001. http://dspace.lib.cranfield.ac.uk/handle/1826/4625.

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The emission of sulphur oxides during the combustion of coal is one of the causes of an environmental problem known as acid rain. Biodesulphurisation technology applied as a method to remove sulphur before coal combustion was investigated in this work. The desulphurisation abilities of three specific bacterial strains including Rhodococcus erythropolis IGTS8, R. erythropolis X309 and Shewanella putrefaciens strain NCIMB 8768 have been evaluated. R. erythropolis IGTS8 and X309 were found to be able to remove both inorganic and organic sulphur from model compounds and coal samples. Their abiliti

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15

Haley, Evelyn. "Coal char reactivity." Thesis, University of Newcastle Upon Tyne, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316261.

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16

Rodriguez-Cruz, N. M. "Chemistry of coal." Thesis, University of Newcastle Upon Tyne, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372569.

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17

Oh, Myongsook Susan. "Softening coal pyrolysis." Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/15245.

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Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1985.<br>MICROFICHE COPY AVAILABLE IN ARCHIVES AND SCIENCE.<br>Bibliography: leaves 275-284.<br>by Myongsook Susan Oh.<br>Sc.D.

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18

Basim, Gul Bahar Jr. "Fine Coal Dewatering." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/35680.

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Abstract (sommario):

Fine coal constitutes a relatively small portion of a product stream in a coal cleaning plant. However, its processing cost is approximately three times higher than the cost of processing coarse coal. Therefore, many coal companies chose to discard the fines to refuse ponds, causing a loss of profit and creating environmental concerns. This problem can be solved by developing more efficient fine coal dewatering processes, since bulk of the cost associated with processing fine coal is due to dewatering. For this reason, Virginia Tech has developed new chemicals that can increase the efficie

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19

Cai, Haiyong. "Fast pyrolysis of coals and char characterisation in relation to pulverised coal combustion." Thesis, Imperial College London, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337707.

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20

Mamurekli, Muruvvet. "Removing pyritic sulphur and trace elements from UK coals by coal beneficiation techniques." Thesis, University of Nottingham, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362911.

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21

Nallani, Chakravartula Madhavi. "Coal hydrotreatment with coal-derived solvents to produce carbon product precursors." Morgantown, W. Va. : [West Virginia University Libraries], 2005. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4237.

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Abstract (sommario):

Thesis (M.S.)--West Virginia University, 2005.<br>Title from document title page. Document formatted into pages; contains viii, 134 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 119-120).

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22

Demir, Ebru. "Developing A Coal Transportation Cost Estimation Model For Turkish Coal Enterprises." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12610432/index.pdf.

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Transportation cost is an important item in total operating cost of an open pit mining operations. In some projects, the transportation cost may reach to 60 % of total operating cost. Turkish Coal Enterprises (TKi) delivers the demanded coal to all cities of Turkey within the context of Prime Ministry Social Solidarity and Aid Fund. The project duration, demanded coal amount whether the coal is needed as packed or unpacked form are determined by local governors. In this study, a model is developed through software, called NAKMAL for the estimation of TKi&rsquo<br>s coal transportation cost. Tr

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23

Beresford, Richard. "Coal, coal mining and the enterprise culture : a study of Doncaster." Thesis, University of Warwick, 2013. http://wrap.warwick.ac.uk/80000/.

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Abstract (sommario):

This study adopts an historical approach to explore the impact of coalmining on the town of Doncaster. It finds that although Doncaster was not a typical mining town nevertheless coal's impact was widespread, and extended beyond direct employment to impact on socio-political factors including the town's external image. Whilst the study explores the impact over the entire one hundred years of mining around Doncaster, the rationale and focus of the study is an assessment of the legacy of the local mining industry, and the extent to which it has inhibited the town's economic competitiveness in wh

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24

Chirume, Clive T. "Evaluation of Coal Surface Modification to Improve Coal-Plastic Composite Strength." Ohio University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1576755034712695.

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25

Duff, Alastair James. "The mechanism of the direct hydrogasification of coals and polymeric coal models." Thesis, Heriot-Watt University, 1988. http://hdl.handle.net/10399/965.

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26

Roy, Mimi. "A detailed sequential extraction study of selenium in coal and coal-associated strata from a coal mine in West Virginia." Morgantown, W. Va. : [West Virginia University Libraries], 2005. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4431.

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Thesis (M.S.)--West Virginia University, 2005.<br>Title from document title page. Document formatted into pages; contains x, 93 p. : ill. (some col.), map (part col.). Vita. Includes abstract. Includes bibliographical references (p. 75-78).

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27

Arcot, Vijayasarathy Udayasarathy. "Mercury emission control for coal fired power plants using coal and biomass." [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-2535.

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28

Guler, Mehmet. "Evaluation Of State Owned Indigenous Coal Fired Power Plants Including Coal Reserves." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12611591/index.pdf.

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Abstract (sommario):

Fossil fuels has preserved their importance in gradually increasing production and consumption of both energy and electricity of the world. Asia, especially China and India, has arisen new actors of the sector. Energy and electricity consumption of Turkey has also increased in parallel with her economic development, but due to her limited resources, she has become more and more energy dependent in order to meet her growing demand. Although hard coal is only found around Zonguldak region, with its abundant and widely spread reserves, Turkey ranked world&rsquo<br>s third place in lignite produc

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29

Kahraman, Hakan. "The sedimentology and coal petrology of the Carboniferous coal measures of Derbyshire." Thesis, University of Nottingham, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.258436.

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30

Turner, John Andrew. "The gasification of coal under conditions pertinent to blast furnace coal injection." Thesis, University of Newcastle Upon Tyne, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246107.

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31

Van, der Westhuizen Bernard Cornelius. "Impact of coal quality on equipment lifetime at coal-fired power stations." Diss., University of Pretoria, 2019. http://hdl.handle.net/2263/79670.

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Abstract (sommario):

With the export of coal being more lucrative than selling coal to South African power producers, power station operators might consider accepting lower-quality coal. While the impact lower quality coal has on cycle efficiency is understood, the influence it has on equipment reliability and lifetime is often not understood. This study focusses on addressing the question of how different characteristics of coal influences different damage mechanisms of common power station equipment. The results are translated into a reference framework that can be used when coal quality variation is expected. T

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32

Ali, Zulfiqar. "Improved strategies for processing fine coal streams." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/49578.

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Abstract (sommario):

In modern coal preparation plants, solid-solid and solid-liquid separation processes used to treat fine coal are least efficient and most costly operations. For example, field studies indicate that the froth flotation process, which is normally used to treat minus (-0.2 mm) fine coal, often recovers less than 65 to 70% of the organic matter in this size range. Fine coal separation processes are also inherently less effective in removing pyrite than that of coarse coal separations. Moreover, while fines may represent 10% or less of the total run-of-mine feed, this size fraction often contains o

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33

Ali, Zulfiqar. "Identification of Improved Stratigies for Processing Fine Coal." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/77050.

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Abstract (sommario):

In modern coal preparation plants, solid-solid and solid-liquid separation processes used to treat fine coal are least efficient and most costly operations. For example, field studies indicate that the froth flotation process, which is normally used to treat minus (-0.2 mm) fine coal, often recovers less than 65 to 70% of the organic matter in this size range. Fine coal separation processes are also inherently less effective in removing pyrite than that of coarse coal separations. Moreover, while fines may represent 10% or less of the total run-of-mine feed, this size fraction often contains o

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34

Slezak, Andrew A. "Modeling of particle trajectories of coal size and density fractions in a gasifier." Morgantown, W. Va. : [West Virginia University Libraries], 2008. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=6016.

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Abstract (sommario):

Thesis (M.S.)--West Virginia University, 2008.<br>Title from document title page. Document formatted into pages; contains x, 164 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 119-121).

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35

Bend, Stephen Leonard. "Coal characterisation and combustion." Thesis, University of Newcastle Upon Tyne, 1989. http://hdl.handle.net/10443/361.

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There are three related studies within this thesis that examine the relationships between the properties of coals and the characteristics of the chars produced during rapid pyrolysis in a laboratory based Entrained Flow Reactor (EFR) which simulates the rapid rates of heating (104 to 105 °C s-1 ) typical of pulverised fuel boilers. The first study, using a suite of nine coals, investigates the influence of coal rank upon the generation of specific types of char, their respective physical and structural characteristics and their relative combustabilities. The second study, using a suite of twen

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36

Du, Plooy A. P. "Coal contract portfolio management." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/6404.

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37

Travis, John Robert. "Coal in Roman Britain /." Oxford (GB) : J. and E. Hedges, 2008. http://catalogue.bnf.fr/ark:/12148/cb41353540h.

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38

Jones, Nerys Anwen. "Coal was our life." Thesis, Open University, 1996. http://oro.open.ac.uk/54426/.

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The study describes the experiences of a small sample of men from Westoe Colliery in South Shields within a comprehensive conceptual framework, that is rather than taking the closure as its starting point this study attempts to understand the importance and relevance of redundancy in terms of the men's life experience. For this reason the men's reasons for entering mining and their subsequent attachment to work are considered as is the increasing dissatisfaction with work experienced following the closure announcement. This study seeks to add to our understanding of the process of redundancy a

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39

Punjak, Wayne Andrew. "High temperature interactions of alkali vapors with solids during coal combustion and gasification." Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184599.

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The high temperature interactions of alkali metal compounds with solids present in coal conversion processes are investigated. A temperature and concentration programmed reaction method is used to investigate the mechanism by which organically bound alkali is released from carbonaceous substrates. Vaporization of the alkali is preceded by reduction of oxygen-bearing groups during which CO is generated. A residual amount of alkali remains after complete reduction. This residual level is greater for potassium, indicating that potassium has stronger interactions with graphitic substrates than sod

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40

Martin, Brandon Ray. "Pyrolysis and ignition behavior of coal, cattle biomass, and coal/cattle biomass blends." [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1148.

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41

Hall, Steven Leon. "Controls on deposition of coal and clastic sediment in the Waikato coal measures." Thesis, University of Canterbury. Geological Sciences, 2003. http://hdl.handle.net/10092/1516.

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Coal seams in the Waikato Coal Measures can vary significantly in thickness over distances of hundreds of meters to kilometers. Previously, the primary depositional controls on these variations have been inferred to be syn-depositional normal faulting and pre-depositional paleotopography. The data presented in support of these models are typically equivocal and which, if any, of these processes provide the principal control on the geometry and spatial distribution of coal seams in the Waikato Coal Region is uncertain. This study utilizes a large database of drill-logs, seismic-reflection lines

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42

Gottschalk, Caroline McColl. "Geochemistry and mineralogy of Tongue River member coal from three Montana coal mines." Thesis, Montana State University, 2010. http://etd.lib.montana.edu/etd/2010/gottschalk/GottschalkC0510.pdf.

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The geochemistry and mineralogy of coal from the Absaloka, Rosebud, and Decker mines located in the Powder River Basin in Montana have been characterized to determine the bulk composition of inorganic constituents in the coal; mineralogy of the coal, including the identity, morphology, composition and distribution of minerals present; occurrence and distribution of potentially hazardous trace elements; and chemical state of selected elements (N, O, S). These data were acquired using instrumental neutron activation analysis (INAA), X-ray powder diffraction (XRD), scanning electron microscopy (S

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43

Whitehouse, Michael. "Coal reactivity and NOâ†x emissions reduction in pulverised coal fired utility boilers." Thesis, University of Leeds, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.275802.

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44

Williams, Bruce T. "Coal dust in their blood : the work and lives of underground coal miners /." New York : AMS press, 1991. http://catalogue.bnf.fr/ark:/12148/cb355982279.

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45

West, Richard D. "NEW APPROACHES FOR MITIGATING ENVIRONMENTAL CONCERNS ASSOCIATED WITH COAL AND COAL COMBUSTION PRODUCTS." OpenSIUC, 2012. https://opensiuc.lib.siu.edu/dissertations/511.

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Currently, coal combustion plays an important role in meeting the energy needs of the United States. It is expected that the effective utilization of coal will be crucial for attaining energy independence for the nation in the next 25 to 30 years, if not longer. The United States burns about 20% of the world's annual coal production, second only to China. Strikingly, there are 200-300 more years of burn at our current rate of consumption, considering our massive coal reserves. Almost half of our electricity comes from coal power. Although coal is a fossil fuel that will become more and mo

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46

Molva, Murat Polat Hürriyet. "Removal of phenol from industrial wastewaters using lignitic coals/." [s.l.]: [s.n.], 2004. http://library.iyte.edu.tr/tezler/master/cevremuh/T000458.pdf.

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47

Vicente, Annalisa Sarga. "Assessing different coal combustion residue backfill scenarios in opencast coal mines, Mpumalanga, South Africa." University of Western Cape, 2020. http://hdl.handle.net/11394/7853.

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>Magister Scientiae - MSc<br>Coal-fired power stations produce large volumes of coal combustion residues (CCRs), which are disposed of in hold ponds or landfill sites. These ash storage facilities are limited in space and are approaching the end of their capacities, thus additional land is required for extensions. If new land is not sourced, power plants will be forced to cease operations, resulting in increased expenditure costs and environmental liability. A proposed disposal solution is to backfill opencast coal mines with CCR monoliths. However, there is limited knowledge on the hydr

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48

Makgato, Seshibe Stanford. "Microbial Desulphurization of Combustion Coal and Environmental Control in Carbonization Coal : Emissions Reduction Techniques." Thesis, University of Pretoria, 2020. http://hdl.handle.net/2263/78953.

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Coal use in electricity generation has attracted much attention recently mainly due to the sector been identified as the main source of sulphur dioxide (SO2) emissions globally. The combustion of coal releases sulphur dioxide emissions into the atmosphere that create air pollution and cause harmful effects on the ecosystem. In the current study, biodesulphurization of Waterberg steam coal was investigated using a bacterial consortium isolated from coal. Coal samples were obtained from the coal feed into the power plant mills, by auto sampling equipment. Coal samples with various particle size

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49

Fenton, David. "Direct liquefaction of coal with coal-derived solvents to produce precursors for carbon products." Morgantown, W. Va. : [West Virginia University Libraries], 2001. http://etd.wvu.edu/templates/showETD.cfm?recnum=1992.

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Abstract (sommario):

Thesis (M.S.)--West Virginia University, 2001.<br>Title from document title page. Document formatted into pages; contains xvi, 135 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 107-109).

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50

Bäck, Frida. "Influence of bio-coal ash respectively coal structure on coke production and coke quality." Thesis, Luleå tekniska universitet, Industriell miljö- och processteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-76180.

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In recent years, the consequences of global warming have increased the discussion about the climate impact caused by humans and the fossil emissions. Sweden has decided to reduce the negative climate impact with a zero vision for the fossil carbon dioxide emissions in year 2045. In order to achieve this, great efforts and changes are needed both in the inhabitants' way of living but primarily in the base industry. The major cause is the use of fossil coal, which generates fossil carbon dioxide in the steel industry in particular. The fossil coal is added to the blast furnace in the steel proce

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