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Dissertations / Theses on the topic 'Coal Coal washing. Fluidization'

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Published: 4 June 2021

Last updated: 15 February 2022

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1

Musser, Jordan M. H. "Development of a separation riser with flow pulsations for small coal particles." Morgantown, W. Va. : [West Virginia University Libraries], 2007. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4997.

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Thesis (M.S.)--West Virginia University, 2007.<br>Title from document title page. Document formatted into pages; contains xiii, 99 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 70-72).

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2

Yan, He Leo, and 嚴鶴. "Revitalization of abandoned coal washing site." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hdl.handle.net/10722/196519.

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3

Pugalia, Neeraj. "Numerical modeling of cold flow and hot gas desulfurization in a circulating fluidized bed." Morgantown, W. Va. : [West Virginia University Libraries], 2001. http://etd.wvu.edu/templates/showETD.cfm?recnum=2056.

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Thesis (M.S.)--West Virginia University, 2001.<br>Title from document title page. Document formatted into pages; contains xvi, 119 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 103-106).

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4

Davis, Van Leslie. "Characterization and scale-up of microbubble generation in column flotation." Thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-03242009-040658/.

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5

Che, Zhuping. "Application and evaluation of spiral separators for fine coal cleaning." Morgantown, W. Va. : [West Virginia University Libraries], 2009. http://hdl.handle.net/10450/10760.

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Thesis (M.S.)--West Virginia University, 2009.<br>Title from document title page. Document formatted into pages; contains viii, 72 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 46-48).

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6

Brown, Michael Duane. "An investigation of fine coal grinding kinetics." Thesis, Virginia Tech, 1986. http://hdl.handle.net/10919/45752.

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In recent years, a great deal of interest has been shown in developing methods for preparing super—clean coal containing less than 2% ash and 0.5% sulfur. New techniques for recovering fine coal, such as micro—bubble flotation, can achieve the desired result provided mineral matter is sufficiently liberated. To achieve sufficient liberation, however, it is often necessary to grind to a mean particle size finer than 10 microns. Since conventional ball mills are highly inefficient in this fine size range, the stirred ball mill has been proposed as a more suitable means for ultrafine grinding.<br

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7

pottimurthy, yaswanth. "Iron-Based Coal Direct Chemical Looping Process: Operation of Sub Pilot Scale Unit with Ohio #6 Bituminous Coal." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1492129127522893.

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8

Oliver, Edmund T. "An investigation into the liberation characteristics of coal middlings." Thesis, University of Nottingham, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.352934.

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9

Paul, Anton Dilojaan. "Electrocatalytically induced liberation of mineral matter from coal." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/82636.

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A new method for demineralizing coal has been developed which is based on the osmotic pressures that occur when electrical double layers overlap. In this technique, coal is exposed to ferric ions in an acidic medium which causes the coal to lose electrons and become positively charged, thereby establishing ionic double layers in the vicinity of its surface. Inside the pores and crevices in which mineral matter is entrapped, the ionic double layers overlap and reduce the chemical potential of water, creating an osmotic pressure. The build-up of such pressure pushes the mineral matter out of the

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10

Panday, Rupendranath. "Modeling, identification and control of a cold flow circulating fluidized bed." Morgantown, W. Va. : [West Virginia University Libraries], 2008. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5833.

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Thesis (M.S.)--West Virginia University, 2008.<br>Title from document title page. Document formatted into pages; contains xiii, 99 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 94-99).

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11

Keyser, Paul Martin. "Continuous column flotation of ultrafine coal using microbubbles." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/90973.

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A flotation column has been developed Incorporating the use of fine air bubbles (less than 100 microns) to remove ash-forming minerals from micronized coal. The microbubble generator used In this work has been characterized and found to yield a very narrow size distribution. Microbubble column flotation tests have been conducted to study a series of operating variables such as time, bubble size, feed rate, feed point, feed percent solids, column height, bubble number concentration, make-up water addition and countercurrent wash water addition. The results show that i) fine air bubbles are Inhe

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12

Akhtar, Haroon. "Development of a small separation riser for fine coal particles." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4466.

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Thesis (M.S.)--West Virginia University, 2006.<br>Title from document title page. Document formatted into pages; contains ix, 81 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 68-69).

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13

Hale, Waverly Mitchell. "Surface chemical aspects of microbubble flotation." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/45816.

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<p>In order to demonstrate the ability of microbubble flotation to superclean coal to ash levels of less than 2%, several Eastern U. S. coals have been tested. The results show that the process is capable of producing superclean coal with improved recovery as compared to the conventional flotation process.<p> <p> To further improve and understand the microbubble flotation process, electrokinetic studies of the hydrocarbon oils used in flotation as collectors have been conducted. Also, the effect of oil emulsifiers on the zeta potential of oil droplets has been studied. In general,

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14

Dieudonne, Vincent. "Chemical and Electrochemical Coal Cleaning in acidic medium application and analysis of the process." Thesis, Virginia Tech, 1988. http://hdl.handle.net/10919/43846.

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15

Halsey, Gregory S. "A preliminary investigation of microbubble flotation of fine coal." Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/94456.

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Although froth flotation is generally recognized as the most viable means of cleaning fine coal, a loss in recovery rate and selectivity is encountered when attempting to apply the process to clean ultrafine coals. In this work, batch flotation tests were conducted on several Appalachian coals using microbubbles in a cylindro-conical flotation column. Results indicate that this technique shows improvements over the conventional technique using larger bubbles, when the coal is ultrafine. The improvement in recovery rate with the microbubbles is due to improved hydrodynamic conditions which are

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16

Vargas, Duarte Gerardo. "An experimental study of the hydrodynamics of multiphase flow in fluidized beds." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2009. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.

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17

Schroedter, Taylor L. "Conceptual Design of a Pilot-Scale Pressurized Coal-Feed System." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/7717.

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This thesis discusses the results and insights gained from developing a CFD model of a pilot-scale pressurized dry coal-feed system using the Barracuda CFD software and modeling various design concepts and operating conditions. The feed system was required to transport approximately 0.00378 kg/s (30 lb/hr) of pulverized coal from a vertical hopper to a 2.07 MPa (20.4 atm or 300 psi) reactor with a CO2-to-coal mass flow ratio of 1-2. Two feed system concepts were developed and tested for coal mass flow, CO2-to-coal mass ratio, steadiness, and uniformity. Piping system components also were evalu

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18

McKeon, Timothy Josiah. "An In-Plant Evaluation of Froth Washing on Conventional Flotation Cells for Coal." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/35708.

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Column flotation cells have become increasingly popular in the coal industry due to their ability to improve flotation selectivity. The improvement can be largely attributed to the use of froth washing, which minimizes the nonselective entrainment of ultrafine minerals matter into the froth product. Unfortunately, the practice of adding wash water in conventional flotation machines has been largely unsuccessful in industrial trials. In order to better understand the causes of these failures, a detailed in-plant test program was undertaken to evaluate the use of froth washing at an operating

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19

Gray, Stuart. "Groundwater remediation using a coal washery discard permeable reactive wall." Access electronically, 2005. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20061017.133840/index.html.

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20

Estejab, Bahareh. "Hydrodynamic and gasification behavior of coal and biomass fluidized beds and their mixtures." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/79366.

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In this study, efforts ensued to increase our knowledge of fluidization and gasification behavior of Geldart A particles using CFD. An extensive Eulerian-Eulerian numerical study was executed and simulations were compared and validated with experiments conducted at Utah State University. In order to improve numerical predictions using an Eulerian-Eulerian model, drag models were assessed to determine if they were suitable for fine particles classified as Geldart A. The results proved that if static regions of mass in fluidized beds are neglected, most drag models work well with Geldart A parti

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21

Wimer, Bryan M. "Fine particle separation in a riser with flow modifications." Morgantown, W. Va. : [West Virginia University Libraries], 2007. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5047.

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Thesis (M.S.)--West Virginia University, 2007.<br>Title from document title page. Document formatted into pages; contains xi, 133 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 119-120).

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22

Tuia, Jacob Talailetalalelei. "Correlating Pressure, Fluidization Gas Velocities, andSolids Mass Flowrates in a High-PressureFluidized Bed Coal Feed System." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/7546.

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The goal of this thesis was to understand what parameters would be most impactful when delivering dry, pulverized coal in a dilute-phase, with a high-pressure feed-system to a pressurized oxy-combustion (POC) reactor. Many studies have conveyed materials in dense-phase plugs at high-pressure or in dilute-phase flows at atmospheric pressure. Very few studies have fluidized and conveyed materials in dilute-phase flows at high pressure, as we needed to. Additionally, studies which might have been applicable based upon system -pressure and -phase delivered findings that were empirically based and

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23

Jain, Riddhika. "Processing of Low Rank Coal and Ultrafine Particle Processing by Hydrophobic-Hydrophilic Separation (HHS)." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/51565.

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This thesis pertains to the processing of ultra-fine mineral particles and low rank coal using the hydrophobic--hydrophilic separation (HHS) method. Several explorative experimental tests have been carried out to study the effect of the various physical and chemical parameters on the HHS process. In this study, the HHS process has been employed to upgrade a chalcopyrite ore. A systematic experimental study on the effects of various physical and chemical parameters such as particle size, reagent dosage and reaction time on the separation efficiencies have been performed. For this, a copper rou

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24

Agarwal, Gaurav. "Solid Fuel Blend Pyrolysis-Combustion Behavior and Fluidized Bed Hydrodynamics." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/51677.

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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 math

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25

Bayham, Samuel C. "Iron-Based Coal Direct Chemical Looping Process for Power Generation: Experimental Aspects, Process Development, and Considerations for Commercial Scale." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1425759077.

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26

Moraes, Anderson Antonio Ubices de. "Modelagem e simulação da combustão em leito fluidizado de carvão mineral com alto teor de cinzas com dessulfuração por calcário." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/18/18147/tde-20062011-204522/.

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A geração de energia em larga escala a partir da combustão de carvões minerais impõe pesados ônus ao meio ambiente devido às emissões de poluentes. O processo de combustão em leito fluidizado destaca-se neste contexto, permitindo reduções de emissões de gases \'SO IND.X\' e \'NO IND.X\' acima de de 90%. O projeto, otimização e escalonamento de reatores de leito fluidizado são realizados de forma quase completamente empírica, através de desenvolvimentos em plantas de demonstração de escalas reduzidas. Os custos e tempos de implementação envolvidos são elevadíssimos, tornando ferramentas teórica

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27

Linhares, Felipe de Aguiar de. "Avaliação fluidodinâmica e processo de co-combustão de resíduo de casca de acácia negra com carvão mineral em planta piloto de leito fluidizado borbulhante." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/156803.

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A preservação ambiental e o uso de combustíveis fósseis para geração de energia têm estimulado a realização de pesquisas na busca de alternativas para a redução das emissões de gases poluentes como CO2, CO, SO2 e NOx. O uso da biomassa em sistemas de co-combustão em leito fluidizado é mencionado como uma destas alternativas. O presente trabalho utilizou biomassa residual da indústria de extração de tanino, o Resíduo de Cascas de Acácia Negra (RCAN), em conjunto com carvão mineral da Mina de Candiota – RS com o objetivo de estudar a fluidodinâmica entre diferentes composições destes materiais e

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28

Marie, Béatrice. "Etudes hydrodynamiques sur la combustion du charbon dans le foyer d'une chaudiere ignifluid." Paris, ENMP, 1987. http://www.theses.fr/1987ENMP0062.

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L'etude du procede ignifluid de combustion du charbon en lit fluidise a ete realisee sur une chaudiere industrielle et sur deux maquettes modeles reduits du foyer. A partir d'essais sur maquette rectangulaire, on a propose un schema d'ecoulement des gaz et des solides dans le lit

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29

"An investigation of the hydrodynamics of the teetered bed separator for fine coal recovery." Thesis, 2005. http://hdl.handle.net/10413/2726.

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The South African coal industry produces a large quantity of coal per annum. The rejects from various unit operations, such as spirals, consist of fine coal that joins the plants tailings dam waste. As existing high quality resources become depleted, the need to improve recovery of this fine coal grows. This project investigates the use of a teetered bed separator (TBS); a hindered settling gravity concentration device for fine coal recovery. This device has proven successful in the United Kingdom and in Australian collieries for fine coal separation in the size range between 2mm and 0.3mm. It

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30

Chen, Wen-Ben, and 陳文彬. "Investigation the Effect of Washing Reagent on the Physico-chemical Properties of Coal Fly Ash." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/54310776631865085685.

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碩士<br>國立屏東科技大學<br>環境工程與科學系所<br>96<br>Coal fly ash is generated from the air-pollution control devices of coal-burn electric-generation plants. Because the producing amount is huge day by day, and non-hazardous, coal fly ash has already changed into a additive industrial waste into a mineral additive of concrete, to improve the defect of the traditional concrete. The nature of the coal fly ash is influenced by the coal source, system of burning, operating conditions and environmental factor etc, resulted in a unstable quality and various appearent color of coal fly ash. This research focused on

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31

Mukatuni, Sedzani. "Geology and characterization of coal at the Mushithe Coal Occurrence, Soutpansberg Coalfield, Limpopo Province, South Africa." Diss., 2019. http://hdl.handle.net/11602/1456.

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MESMEG<br>Department of Mining and Environmental Geology<br>The Mushithe coal occurrence is situated approximately 16 km west of the Tshikondeni coal mine in the Tshipise-Pafuri sub-basin of the Soutpansberg coalfield in South Africa. The Soutpansberg Coalfield has received comparatively less attention compared to other more notable South African coalfields. There is as a consequence very limited information in the public domain applicable to the geology as well as quality of coal in this coalfield, as a result there is no known study focused exclusively on the Mushithe coal occurrence. The a

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32

Du, Plessis Cheryl. "Investigating the opportunity to increase yield by means of froth washing on mechanical coal flotation cells." Thesis, 2018. https://hdl.handle.net/10539/26587.

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MSc (50/50) School of Chemical and Metallurgical Engineering, Faculty of Engineering and the Built Environment, University of the Witwatersrand, Johannesburg, South Africa July, 2018<br>Froth washing is a process where water is injected or sprayed onto or into the froth to remove or flash-down gangue particles present in the froth because of hydraulic entrainment. This process was recently tested at Anglo American’s Goedehoop South (GHS) Flotation plant to evaluate its effects on the yield and product quality during coal fines flotation. The research aimed to design a suitable and effective

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33

Roets, Leon. "The effect of mineral addition on the pyrolysis products derived from typical Highveld coal / Leon Roets." Thesis, 2014. http://hdl.handle.net/10394/15528.

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Mineral matter affect various coal properties as well as the yield and composition of products released during thermal processes. This necessitates investigation of the effect of the inherent minerals on the products derived during pyrolysis, as pyrolysis forms the basis of most coal utilisation processes. A real challenge in this research has been quantifying the changes seen and attributing these effects to specific minerals. Thus far it has been deemed impossible to predict product yields based on the mineral composition of the parent coal. Limited research regarding these aspects has been

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