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Dissertations / Theses on the topic 'Methane explosion'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Steeves, Laura. "SIMPLIFYING TECHNIQUES APPLIED TO COMPUTATIONAL FLUID DYNAMICS MODELING OF METHANE EXPLOSIONS." UKnowledge, 2019. https://uknowledge.uky.edu/mng_etds/47.

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Traditional methods of studying underground coal mine explosions are limited to observations and data collected during experimental explosions. These experiments are expensive, time-consuming, and require major facilities, such as the Lake Lynn Experimental Mine. The development of computational fluid dynamics (CFD) modeling of explosions can help minimize the need for large-scale testing. This thesis utilized the commercial CFD software, SC/Tetra, to examine three case studies. The first case study modeled the combustion of methane in a scaled shock tube, measuring approximately 1 foot by 1 f

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2

Lin, Wei. "The Ignition of Methane and Coal Dust by Air Compression - The Experimental Proof." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/36740.

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When a large area of open gob collapses suddenly, a windblast is produced that can cause considerable damage throughout the infrastructure of a mine. In a few cases, the windblast has been accompanied by ignitions of methane and/or coal dust. Analytical and numerical analyses investigated the transient behavior of the air through the small time period during which the roof is falling. This is sufficiently short to allow adiabatic compression of the air, i.e. negligible heat transfer to rock surfaces. Controlled escape of the air via interconnecting entries limits the build-up of air pressure.

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3

Xie, Yanxuan. "Study of Interaction of Entrained Coal Dust Particles in Lean Methane-Air Premixed Flames." Digital WPI, 2011. https://digitalcommons.wpi.edu/etd-theses/1065.

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"This study investigates the interaction of micron- sized coal particles entrained into lean methane €“ air premixed flames. In a typical axisymmetric burner, coal particles are made to naturally entrain into a stream of the premixed reactants using an orifice plate setup. Pittsburgh seam coal dust, with three particle sizes in the range of 0 to 25 µm, 53 to 63 µm, and 75 to 90 µm is used. The effects of different coal dust concentrations (10 €“ 300 g/m3) at three lean equivalence ratios, ϕ (methane-air) of 0.75, 0.80 and 0.85 on the laminar burning velocity are determined experimentally. The

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4

Dougal, Jérémy. "Étude numérique et expérimentale des jets d’ergols cryogéniques autour d’un avion spatial et leurs conséquences sur le risque d’explosion." Thesis, Orléans, 2019. http://www.theses.fr/2019ORLE3035.

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ArianeGroup développe un avion spatial utilisant un moteur-fusée à ergols cryogéniques dont le carburant est le méthane et le comburant l’oxygène. Cet avion est amené à vidanger du méthane en vol atmosphérique où les turboréacteurs sont en marche. Il est nécessaire de modéliser le nuage d’ergol vidangé et le risque résultant d’explosion aux abords de l’appareil. Lors de la vidange, un jet liquide cryogénique débouchant perpendiculairement à un écoulement d’air se forme. Ce type de jet est complexe à modéliser et demande des ressources informatiques importantes. Il a donc été décidé de simplifi

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5

Лєпіхов, Олександр Іванович, Александр Иванович Лепихов, Oleksandr Ivanovuch Liepikhov та О. Василенко. "Устройство измерения параметров инфракрасных импульсов". Thesis, Издательство СумГУ, 2010. http://essuir.sumdu.edu.ua/handle/123456789/21103.

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6

Borgström, Ylva. "Pretreatment technologies to increase the methane yields by anaerobic digestion in relation to cost efficiency of substrate transportation." Thesis, Linköpings universitet, Tema vatten i natur och samhälle, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-69755.

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Med ett växande energibehov i världen, sinande energikällor i form av fossila bränslen och en miljö som vi under en längre tid har förorenat behövs det nya energiformer som är mer långsiktiga och framförallt miljövänliga. En sådan energiform är biogas. Biogasprocessen är dock inte helt optimerad. Flera av de substrat som används idag tar lång tid att röta och bryts bara ner till viss del i processen eller innehåller onödigt mycket vatten, vilket ger höga transportkostnader. Med syfte att göra biogasprocessen mer ekonomisk lönsam utvärderas i denna rapport på uppdrag från E.ON några olika förbe

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7

Puthumana, Amal Babu. "Effect of feed ratio and pre-treatment on methane yields during anaerobic co-digestion of sugarcane bagasse and trash with chicken manure." Thesis, Griffith University, 2020. http://hdl.handle.net/10072/393971.

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Australia is one of the major producers and exporter of agricultural products. Annually, Australian agriculture produces approximately 151 Tg CO2 equivalent emissions. The use of fossil fuels in crop cultivation, harvesting and transportation are considered as the primary source of these greenhouse gas (GHG) emissions. Moreover, agronomic management and crop residues left in the field also contribute to these GHG emissions. Alternative waste management practices include the use of crop residues and agro-wastes as feedstocks for bioenergy production. Anaerobic digestion is considered as sustain

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8

Abrahamsson, Louise. "Improving methane production using hydrodynamic cavitation as pre-treatment." Thesis, Linköpings universitet, Tema Miljöförändring, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-128783.

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To develop anaerobic digestion (AD), innovative solutions to increase methane yields in existing AD processes are needed. In particular, the adoption of low energy pre-treatments to enhance biomass biodegradability is needed to provide efficient digestion processes increasing profitability. To obtain these features, hydrodynamic cavitation has been evaluated as an innovative solutions for AD of waste activated sludge (WAS), food waste (FW), macro algae and grass, in comparison with steam explosion (high energy pre-treatment). The effect of these two pre-treatments on the substrates, e.g. parti

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9

Crayford, Andrew Philip. "Suppression of methane-air explosions with water in the form of 'fine' mists." Thesis, Cardiff University, 2004. http://orca.cf.ac.uk/55919/.

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This thesis is concerned with the combustion hazard posed when there are accidental releases of methane from plant, particularly within the petrochemical 'exploration and production' industry. At the present time, such explosion hazards are controlled using explosion suppression systems based around Halon 1301 deployment. However, due to its environmental impact, such methods are being reviewed with the objective being their replacement with environmentally friendly alternatives. During the course of this study, the effect of water in the form of vapour and 'fine' mists has been investigated t

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10

Murphy, Michael M. "Analysis of Seismic Signatures Generated from Controlled Methane and Coal Dust Explosions in an Underground Mine." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/29705.

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Examination of seismic records during the time interval of the Sago Mine disaster in 2006 revealed a small amplitude signal possibly associated with an event in the mine. Although the epicenter of the signature was located in the vicinity where the explosion occurred, it could not be unequivocally attributed to the explosion. More needs to be understood about the seismicity from mine explosions in order to properly interpret critical seismic information. A seismic monitoring system located at NIOSHâ s Lake Lynn Experimental Mine has monitored nineteen experimental methane and dust based ex

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11

Wedding, William Chad. "MULTISCALE MODELING OF THE MINE VENTILATION SYSTEM AND FLOW THROUGH THE GOB." UKnowledge, 2014. https://uknowledge.uky.edu/mng_etds/11.

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The following dissertation introduces the hazard of methane buildup in the gob zone, a caved region behind a retreating longwall face. This region serves as a reservoir for methane that can bleed into the mine workings. As this methane mixes with air delivered to the longwall panel, explosive concentrations of methane will be reached. Computational fluid dynamics (CFD) is one of the many approaches to study the gob environment. Several studies in the past have researched this topic and a general approach has been developed that addresses much of the complexity of the problem. The topic of rese

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12

Скрипник, О. В., В. В. Свяцький, O. Skrypnyk та V. Sviatskyi. "Перспективні напрямки технологічного застосування гідратів двооксиду вуглецю". Thesis, ХНТУ, 2017. http://dspace.kntu.kr.ua/jspui/handle/123456789/6869.

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Наведено аналіз останніх досліджень і приклади застосування газових гідратів двооксиду вуглецю. Наведено приклад можливості заміщення двооксидом вуглецю метану у природніх гідратах, організовуючи контрольований видобуток метану із субаквальних газогідратних покладів. Розглянуто питання про обмеження викиду парникових газів за рахунок їх уловлювання і зберігання за допомогою технології CCS (Carbon Capture and Storage). Наведено приклад каскадних систем на базі аміаку з двооксидом вуглецю із сумішами вуглеводнів як основу холодильних установок для одержання глибокого холоду. Розглянуто спосіб ви

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13

Ramangalahy, Jules. "Contribution a l'etude du vieillissement des compositions pyrotechniques : "le systeme zirconium-chromate de plomb"." Orléans, 1987. http://www.theses.fr/1987ORLE2017.

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14

Al-Zuraiji, Mohammed Jabbar Ajrash. "Ignition and explosion characteristics of coal dust and methane mixture under conditions pertinent to ventilation air methane abatement." Thesis, 2020. http://hdl.handle.net/1959.13/1412553.

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Research Doctorate - Doctor of Philosophy (PhD)<br>Fire and explosion caused by combustible dusts and flammable gases is a major safety concern in the extractive industries, such as petroleum and coal mining. Combustible coal dust and methane gas can be exploded in the presence of an ignition source with sufficient ignition energy. These accidents can claim many lives and cause considerable property damage. The indirect costs of these types of accidents, however, are substantially higher and cannot be expressed in dollars. To avoid fires and explosions from occurring in coal mines as well as t

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15

Flint, John Derek. "Mine gas and coal dust explosions and methane outbursts - their causes and prevention." Thesis, 1990. https://hdl.handle.net/10539/24640.

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A Dissertation submitted to the Faculty of Engineering, University of the Witwatersrand, Johannesburg, for the degree of Master of Science in Engineering.<br>Ignitions of methane and coal dust have caused considerable loss of life and damage to installations in South African collieries during the past century. The phenomenon of methane outbursts have also resulted in the creation of dangerous conditions underground. The dissertation examines the causes of methane outbursts and the seven main ignition sources leading to methane and coal dust explosions. These ignition sources were derive

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16

Diakow, PETER. "DETONATION CHARACTERISTICS OF DIMETHYL ETHER, METHANOL AND ETHANOL AIR MIXTURES." Thesis, 2012. http://hdl.handle.net/1974/7428.

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The detonation characteristics of dimethyl ether-air, methanol-air and ethanol-air mixtures, initially at atmospheric pressure and a temperature range of 298K to 373K, were investigated in this study. Experiments were performed in a heated detonation tube, 6.1m long with an inner- diameter of 10cm. Transition to detonation was achieved for fuel-air mixtures by spark ignition and subsequent flame acceleration using orifice plate obstacles in the first half of the tube, and via a gas driver with a short orifice plate obstacle section. Cell width measurements where obtained using the soot foil te

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17

Landman, Gysbert van Rooyen. "Ignition and initiation of coal mine explosions." Thesis, 2015. http://hdl.handle.net/10539/17313.

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18

Chen, Jun-kai, and 陳俊愷. "Fire and explosion hazard analysis on flammable binary solutions－An example on benzene/methanol mixtures." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/12710423043186514692.

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碩士<br>國立雲林科技大學<br>環境與安全工程系碩士班<br>92<br>The purpose of this research was to investigate the influence of binary solutions by mixing different vapor ratios of benzene and methanol under various initial pressures (760 and 1,520 mmHg), temperatures (100, 150 and 200℃) and vapor mixing ratios (100/0, 75/25, 50/50, 25/75 and 0/100 vol.%). According to the experimental results, the flammability diagram of benzene and methanol by mixing different vapor ratios can be illustrated completely and combined with specific safety-related properties of benzene and methanol, such as upper flammability limit (UE

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19

Ghosh, Anupam. "Experimental Studies on Methanol Sprays for IC Engine Applications." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/4803.

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In this work, studies have been conducted on sprays of methanol and its emulsions with diesel towards assessing the potential of methanol as an alternative fuel for IC engines. Methanol can be used in compression ignition engines as a methanol-in-diesel emulsion, and in spark ignition engines as a direct gasoline-substitute. Evaporating spray characteristics of methanol-in-diesel emulsions and pure methanol are studied in a high-pressure chamber with optical access. In the first part of the study, a comparison between two measurement methods (DBI and scattering) along with two post-processing

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20

Rodhiya, Akash. "Numerical simulations of hydrogen flames in reheat gas turbine combustor: effect of pressure scaling and fuel blending." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5760.

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With a goal toward a net-zero energy supply, hydrogen, hydrogen-enriched natural gas, and biofuels, which reduce the carbon footprint, are actively being considered for firing stationary gas turbine engines. In this regard, the longitudinally-staged combustion concepts have been demonstrated to achieve low emissions and good fuel flexibility while operating over a wide range of load conditions. A particular implementation of such a concept is the constant pressure sequential combustor in Ansaldo Energia’s GT36 gas turbine comprised of two fuel stages implementing lean premixed combustion with

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